EP0258248B1 - Process and device for piecing threads on an open-end friction spinning device - Google Patents

Process and device for piecing threads on an open-end friction spinning device Download PDF

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Publication number
EP0258248B1
EP0258248B1 EP86903236A EP86903236A EP0258248B1 EP 0258248 B1 EP0258248 B1 EP 0258248B1 EP 86903236 A EP86903236 A EP 86903236A EP 86903236 A EP86903236 A EP 86903236A EP 0258248 B1 EP0258248 B1 EP 0258248B1
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EP
European Patent Office
Prior art keywords
thread
nip
friction
spinning
fibres
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86903236A
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German (de)
French (fr)
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EP0258248A1 (en
Inventor
Kurt Lovas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rieter Ingolstadt Spinnereimaschinenbau AG
Original Assignee
Schubert und Salzer Maschinenfabrik AG
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/48Piecing arrangements; Control therefor
    • D01H4/52Piecing arrangements; Control therefor for friction spinning

Definitions

  • the present invention relates to a method for piecing an open-end friction spinning device which has two friction spinning elements which are driven in the same direction and form a suction wedge gap, in which a thread end is delivered to a piecing position provided outside the wedge gap and is transferred out of this into a thread formation zone in the wedge gap where it is drawn off again as a continuous thread with the inclusion of the fibers fed to the wedge gap, and a device for carrying out this method.
  • the thread end is returned with the aid of a guide device with the cover open outside the wedge gap to a suction nozzle (DE-OS 3.318.266).
  • a suction nozzle DE-OS 3.318.266
  • an intermediate section of the thread is transferred into the wedge gap of the friction spinning elements which have previously been shut down.
  • the cover is then closed and the thread take-off is switched on.
  • the friction spinning elements are then driven again and the fiber feed is switched on in such a way that the fibers reach the wedge gap at the same time as the thread end. Since the desired delivery quantity does not suddenly get into the wedge gap, but only gradually, a thin spot cannot be avoided after the thread end connected to the fibers.
  • This object is achieved according to the invention in that the thread is fed to the wedge gap in such a way that the thread first reaches the thread formation zone with its free thread end, and the feed of the fibers into the wedge gap is controlled in such a way that the thread end simultaneously with reaching the thread formation zone comes into contact with the fibers.
  • the area of the thread that comes into contact with the fibers is therefore quite short.
  • This thread area is now drawn off from the wedge gap and thereby binds in the fibers fed into the wedge gap. Since the thread end only comes into contact with the fibers when the thread formation zone is reached and is already in the wedge gap at the start of the spinning process and does not have to be inserted into this after another thread area has already started to bind fibers, the fault is in newly spun thread very short and usually even falls short of the length of the fiber feed zone, which is determined by the length of the mouth of the fiber feed channel. The thick point in the piecing is even shorter since not the entire length of the thread returned to the length of the friction spinning elements reaches the wedge gap, but only the end section of the thread facing away from the take-off side. A thin spot following the piecing can be avoided by timing the insertion of the fiber feed, which can be controlled independently of the thread feed into the wedge gap.
  • the method according to the invention is also intended to include a method in the sense of the present invention in which only the end portion of the returned thread reaches the thread formation zone and the thread region between this end portion and the take-off side End of the wedge gap does not get into the thread formation zone at all.
  • the previous thread end which now forms this intermediate region of the thread, comes into this region of the wedge gap on the pull-off side during the pull-off movement of the thread. H. likewise only later, when the thread end has been fed to the thread formation zone for piecing.
  • the supply of fibers starts in the wedge gap before the thread end has reached the thread formation zone.
  • the thread end is thus placed on the fiber mass collected in the wedge gap, which is now integrated into the thread end together with newly added fibers. In this way, the amount of fibers to be integrated in the piecer can be determined in a simple manner.
  • the method according to the invention is such that when a thread break occurs, not only is the fiber supply to the friction spinning elements interrupted, but at the same time the friction spinning elements are stopped, and that during the return of the thread to the piecing position outside the wedge gap, the friction spinning elements are driven again, whereupon the supply of fibers in the wedge gap is released.
  • the friction spinning elements are driven at a reduced rotational speed during the feeding of the thread end into the thread formation zone until after the thread take-off has been inserted.
  • the thread is fed radially to the wedge gap in such a way that the thread is placed outside the wedge gap on the friction spinning element which rotates into the wedge gap and is fed to the wedge gap by this friction spinning element.
  • the procedure is preferably such that the thread end is placed obliquely on the friction element which rotates into the wedge gap in such a way that the free thread end is at a smaller distance from the wedge gap than the thread section located at the end of this friction spinning element on the take-off side.
  • the piecing position is selected such that the thread brought into the piecing position and transferred into the thread-forming zone, before being subjected to a draw-off, only extends into the area of the thread-forming zone to which the fibers are fed. Since the thread end does not extend beyond the area to which the fibers are fed at the moment it reaches the thread formation zone, the fiber feed can also start before the thread to be spun enters the thread formation zone. This possibility of starter has the advantage that a relatively long period of time is available for the insertion of the fiber feed.
  • the procedure is such that the thread is brought to a defined length, is returned a defined distance outside the wedge gap into the length range of the thread formation zone and the thread end is held in this position by clamping, so that fibers are then fed to the wedge gap and then the thread is placed on the fibers in the wedge gap.
  • the piecing process can be precisely controlled in a simple manner.
  • the thread end is clamped in fine threads greater distance from the take-off end of the wedge gap than with coarse threads. This means that finer threads are in the wedge gap longer than coarse threads, which means that the differences in the speed relationships between fiber feed and thread take-off are somewhat compensated for during the preparation.
  • the piecing security is increased.
  • the attachment can take place in such a way that the free thread end reaches the wedge gap while the thread is still held by the clamp. In this way it is ensured that the thread end always reaches the wedge gap earlier than the thread region facing the withdrawal end of the wedge gap.
  • exact insertion of the thread take-off is achieved by first feeding the thread to the wedge gap by means of a clamping point movable in the thread take-off direction and then, without the thread being released by this clamping point, being pulled off the wedge gap by this movable clamping point becomes.
  • the thread drawn off from the wedge gap is expediently passed through the movable clamp to a storage location, which compensates for fluctuations in take-off when the take-off is taken over by the take-off device which carries out the normal spinning take-off.
  • a storage location can also be used to temporarily store the excess thread lengths when the thread is transferred from the movable clamping point to the bobbin.
  • the thread to be brought into the piecing position is first fed to the wedge gap and then to the storage location by the clamping point movable in the draw-off direction, from where the thread is transferred to a newly inserted empty tube.
  • the thread is fed from the nip into the wedge gap by the suction air acting on the friction spinning elements.
  • this thread feed to the wedge gap can be supported by a compressed air flow directed into the wedge gap.
  • the threading is carried out by bringing the thread to a defined length, by a defined distance outside the wedge gap beyond the end of the thread formation zone facing away from the take-off side, back into the effective range of an elastic retention force, so that fibers are then fed to the wedge gap and the thread subtracted against the elastic retention force and after leaving the effective range of the elastic retention force is placed on the fibers located in the wedge gap.
  • the thread is placed later on the fibers located in the wedge gap with fine threads than with coarse threads.
  • fibers can be pre-fed over a relatively long period of time, so that enough fibers are available for piecing in spite of the small fiber delivery quantity per unit of time.
  • this can be further supported by the fact that the thread is subjected to a drawdown only after a delay after reaching the thread formation zone.
  • the open-end friction spinning device has a cover for the friction spinning elements, which has a fiber feed channel and, in addition to the fiber feed channel, a thread insertion slot which extends essentially in the longitudinal direction of the friction spinning elements and which extends from the outside of the cover to its inside and from the end on the trigger side to a maximum extends to the mouth end of the fiber feed channel facing away from the take-off side, a thread holding device holding the thread essentially parallel to the thread insertion slot being arranged outside the wedge gap and a thread guide is also provided which keeps the thread at the take-off end of the friction spinning elements away from the wedge gap as long as the thread end keeps the wedge gap has not reached.
  • the thread insertion slot enables the thread to remain outside the thread formation zone during its return to the piecing position and, when the cover is closed, can be fed out of this piecing position to the thread formation zone.
  • the thread is held parallel to the thread insertion slot by the thread holding device.
  • This thread holding device is arranged and controlled in such a way that, together with a thread guide, it releases the thread in such a way that it reaches the thread formation zone first or only with its free end, while the thread section between the thread end and the takeoff-side end of the wedge gap decelerates or does not get into the thread formation zone at all.
  • the thread guide can be designed differently and may also be formed by the thread holding device itself. According to a simple embodiment of the subject matter of the invention, the thread guide is designed as a deflection, which deflects the thread leaving the friction spinning elements in the direction of the cover.
  • the thread insertion slot can also be designed differently. Depending on the design of the thread holding device, it may be advantageous if the thread insertion slot, following its area that extends from the outside of the cover to the inside thereof, has an area adjoining it on the side facing away from the take-off side, which area has a slot bottom from the side The inside of the cover is separated, this slot bottom expediently forming an acute angle with the inner wall of the cover.
  • the thread holding device is designed as a suction air nozzle which opens into the end of the thread insertion slot facing away from the take-off side. This suction air nozzle initially picks up the returned thread and gradually releases it again after the thread draw has been inserted, the thread being prevented by a thread guide from entering the thread formation zone. This is only possible at the end of the thread after release by the suction air nozzle.
  • the suction air nozzle is arranged in the slot bottom.
  • the suction air nozzle expediently opens into the slot bottom parallel to the thread formation zone.
  • the present invention is not tied to a specific design of the thread holding device. According to a preferred embodiment, this is designed as a thread clamp.
  • This thread clamp is advantageously assigned a separating device which gives the thread a defined length and shape.
  • Such an embodiment of the subject matter of the invention is particularly advantageous in which the thread clamp can be moved from a thread take-up position for receiving a thread drawn off a bobbin into a thread transfer position for transferring the thread into the thread insertion slot.
  • the movable thread clamp can carry a switch which is connected to a control device for controlling the piecing process and can be actuated from the cover when the thread transfer position is reached.
  • the thread clamp can preferably be moved along the thread insertion slot, the thread clamp for transferring the thread to the thread insertion slot in the direction of the thread take-off as far as the mouth of a pneumatic store arranged between the friction spinning elements and a winding device, and being controllable in such a way that the thread clamp only reaches the thread releases the pneumatic memory.
  • defined piecing ratios are achieved in a simple manner, since both the thread feed into the thread bil tion zone as well as the withdrawal of the spun thread from this thread formation zone by one and the same element, namely the thread clamp.
  • an auxiliary thread is available for spinning.
  • an auxiliary spool is arranged on a maintenance carriage which can be moved along a plurality of open-end friction spinning devices, from which the thread can be fed to the thread clamp.
  • the thread clamp itself can fetch the thread length required for piecing; however, a separate feed device can also be provided for this purpose, and depending on the design of the device, the thread extending to the auxiliary bobbin can also be severed between the auxiliary bobbin and the thread clamp during each piecing process.
  • a compressed air nozzle directed into the thread insertion slot which blows the thread into the thread insertion slot, can be assigned to both a stationary and a movable thread clamp.
  • the fiber feed channel opens into the wedge gap, while the thread insertion slot opens outside the wedge gap opposite the circumferential surface of the friction spinning element turning into the wedge gap.
  • the end of the thread insertion slot on the take-off side is at a greater distance from the thread-forming zone than the end of the thread-forming zone facing away from the take-off side.
  • the thread insertion slot includes an angle of inclination of less than 90 ° with the direction of rotation of the friction spinning element screwing into the wedge gap.
  • a rapid insertion of the thread into the thread insertion slot is achieved according to the invention in that the thread insertion slot widens towards the outside of the cover. In this way, a reliable function is achieved even with larger movement tolerances.
  • the thread insertion slot can be covered by a controllable closure member.
  • the thread insertion slot is only released for piecing, while it is then covered again for normal spinning.
  • this closure member can be controlled in connection with the other operations of the piecing process from a maintenance carriage which can be moved along a plurality of open-end friction spinning devices.
  • the thread take-off can be adapted to the respective spinning conditions by the thread take-off being decelerated and / or being driven at a reduced speed.
  • the thread spinning elements are assigned a thread monitor controlling their drive and an auxiliary drive device which can be controlled by a maintenance carriage which can be moved along a plurality of open-end friction spinning devices.
  • the friction spinning elements according to the present invention remain covered during the entire piecing process. This enables a very individual and variable control of the piecing process, which can be optimally adapted to the respective spinning parameters (material, thread thickness, etc.). This enables safe and short piecing to be generated both in connection with thread breakage elimination and in connection with a bobbin change. Despite this optimized control, the device according to the invention is simple and space-saving in construction.
  • the open end friction spinning device 10 is together with the feed and dissolving device device 2 is provided stationary at the spinning station 1, of which a plurality are usually arranged side by side in a machine.
  • a maintenance carriage 5 with a piecing device 50 can be moved along these spinning positions 1.
  • the open-end friction spinning device 10 has a housing 13 with two rotationally symmetrical friction spinning elements 100 and 101 (FIG. 3), which form a wedge gap 102. At least one of the friction spinning elements, e.g. B. the friction spinning element 101 is perforated and sucked during spinning in the area of the wedge gap 102. For this purpose, it is connected to a suction air line 11 via a valve 110 (FIG. 1).
  • each friction spinning element 100 and 101 which are formed in the exemplary embodiment of the rollers shown, are driven in the same direction (see arrows P7 in FIG. 3).
  • each friction spinning element 100 and 101 has a whorl 103, against which a drive belt 120 rests.
  • the drive belt 120 is wrapped around two rollers 121 - only one of which is visible in FIG. 1 - in such a way that it is always in a non-positive connection with the whorls 103 of the two friction spinning elements 100 and 101.
  • On the outside of the drive belt 120 there is a drive roller 122 which receives its drive from a tangential belt 12 which extends over a large number of spinning stations 1 located next to one another.
  • the drive roller 122 is carried by the armature 600 of a lifting magnet 60, which can be controlled from a control unit 6, and is thus adjustable in the directions of the arrow 8.
  • An auxiliary drive device 54 which is arranged on the maintenance carriage 5, can be delivered to the friction spinning elements 100 and 101.
  • the auxiliary drive device 54 has a controllable drive roller 540 which is driven by a motor 542 via a (indicated) gear 541.
  • the drive roller 540 is seated at the end of a rod 543 which can be displaced in the longitudinal direction (arrow P1).
  • the rod 543 can be freely moved during this longitudinal movement, the rod can also be pivoted in the vertical direction about a horizontal axis 544 (arrow P2).
  • the axis 544 is mounted on a bearing block 55, which in turn can be rotated about a vertical axis 51 (arrow P3) in order to be able to bring the auxiliary drive device 54 back from the area of the spinning station 1 into the area of the maintenance carriage 5.
  • the feed and dissolving device 2 arranged upstream of the open-end friction spinning device 10 has a feed hopper 20, by means of which the band-shaped fiber material 3 is fed to a feed roller 21, with which a pressure roller or feed trough (not shown) cooperates in the usual way.
  • the fiber material 3 is fed from the feed roller 21 to a dissolving roller 22 which dissolves the band-shaped fiber material into individual fibers.
  • the opening roller 22 is driven in a known manner by a belt 23.
  • a fiber feed channel 24 extends from the opening roller 22 into the wedge gap 102 of the friction spinning elements 100, 101.
  • the thread 30 drawn off by the open-end friction spinning device 10 by means of the draw-off device 4 is monitored on its way to the bobbin 400 driven by a winding roller 401 by a thread monitor 61, which is in control connection with the control unit 6.
  • the piecing device 50 arranged on the maintenance carriage 5 has a suction tube 500 (arrow P4) which can be pivoted against the bobbin 400 and by means of which a thread end can be sucked in from the bobbin 400.
  • the bobbin 400 can be driven in a known manner from the maintenance carriage 5 in the unwinding direction, so that the thread end that is sucked in continues to get into the suction pipe 500.
  • the suction tube 500 has a longitudinal slot (not shown) on its side facing the spinning station 1, so that the thread section sucked in between the slot end facing away from the spool 400 in the vicinity of the pivot axis 501 of the suction tube 500 and the spool 400 can take an elongated course.
  • the thread 30 comes into the swivel range of a controllable thread clamp 70.
  • the thread clamp 70 is part of a thread holding device 7 and is arranged on the free end of an arm 700 which is mounted on the maintenance carriage 5 in such a way that it makes a first pivoting movement about the pivot axis 51 in a horizontal plane (arrow P3) and about a pivot axis 701 can perform a second pivoting movement in a vertical plane (arrow P5).
  • Arm 700 also carries a controllable compressed air nozzle 702.
  • the thread clamp 70 is assigned a pivotable suction tube 52 which is pivotably mounted on a horizontal axis 520, so that it can be pivoted from a receiving position in the vicinity of the thread clamp 70 into a transition position in the vicinity of the bobbin 400 in a vertical pivot plane (arrow P6).
  • the suction pipe 52 is connected via a suction line 521 to a vacuum source (not shown).
  • FIG. 4 shows the housing 13 in a top view
  • FIG. 5 shows the housing 13 in a side view
  • the housing 13 has a thread insertion slot 14 in its cover 130 facing the thread clamp 70.
  • This thread insertion slot 14 extends from the outer side 131 of the cover 130 to the inner side 132 and runs next to the fiber feed channel 24 from the take-off end 133 of the housing 13 to the mouth end 240 of the fiber feed channel 24 facing away from the take-off side (FIG. 3). Since the thread insertion slot 14 is arranged next to the fiber feed channel 24, it opens next to the fiber feed channel 24 and thus outside of the wedge gap 1 02 opposite the friction spinning element 101 in the interior of the housing 13.
  • the maintenance carriage 5 travels to the relevant spinning station 1 for piecing of a signal that the thread monitor 61 triggers when a thread break occurs, or when spinning after a machine standstill, in which the maintenance carriage 5 spins spinning station 1 onto spinning station 1.
  • the suction tube 500 is pivoted about its pivot axis 501 against the spool 400 that was already lifted off the winding roller 401 at an earlier point in time. While the bobbin 400 is driven from the maintenance carriage 5 by means of an auxiliary drive roller (not shown) in the unwinding direction, the suction pipe 500 takes up the unwound thread 30.
  • the bobbin 400 is stopped and the suction tube 500 is pivoted away from the bobbin 400.
  • the thread 30 emerges from the aforementioned longitudinal slot of the suction pipe 500. It assumes an extended position between the end of the longitudinal slot facing the pivot axis 501 and the coil 400.
  • the thread 30 is thus in the pivoting range of the thread clamp 70.
  • the horizontally and vertically pivotable thread clamp 70 is brought into the thread run into a thread take-up position, where it picks up the thread 30. It feeds the thread 30 to a separating device 53 (FIG. 1) provided in the maintenance carriage 5, which cuts the thread 30 on the side of the thread clamp 70 facing away from the bobbin 400.
  • a certain thread length is created from the thread clamp 70 to the end of the thread 30, which is necessary for piecing.
  • the thread clamp 70 is then pivoted in a combined horizontal and vertical movement to the open-end friction spinning device 10.
  • the thread clamp 70 is in a thread transfer position in front of the thread insertion slot 14 (FIG. 5); the thread clamp 70 thus forms a thread holding device 7, which presents the thread end 300 to the thread insertion slot 14.
  • the thread holding device 7 formed by the thread clamp 70 holds the thread 30 essentially parallel to the thread insertion slot 14.
  • the previously switched off vacuum is now again applied to the friction spinning rollers 100, 101 with the help of the valve 110.
  • the fiber feed is switched on again in a known manner.
  • the sliver now arrives in the form of individual fibers in the wedge gap 102 and is twisted there into a fiber bundle 31 within a thread formation zone 104 (FIG. 5).
  • this fiber bundle 31 does not get a real rotation since it can rotate freely in the wedge gap 102.
  • the compressed air in the compressed air nozzle 702 is released in time with the re-switching of the fiber feed into the wedge gap 102, so that the thread end 300 is blown into the thread insertion slot 14 (FIG. 5).
  • This compressed air thus supports the suction air flow flowing through the suctioned friction spinning element 101.
  • the thread end 300 thus reaches outside of the wedge gap 102 on the suctioned outer surface of the friction spinning element 101. Due to the negative pressure acting on the outer surface, the thread end 300 is carried along by the friction spinning element 101 rotating in the wedge gap 102 and placed on the rotating fiber bundle 31.
  • the fiber bundle 31, which forms a still relatively loose fiber structure, is now screwed into the thread end 300.
  • FIG. 5 clearly shows, only the end of the thread end 300 facing away from the take-off side reaches the wedge gap 102, while the take-off end of the thread end 300 is prevented by the thread clamp 70 from entering the wedge gap 102 through the thread insertion slot 14.
  • the thread area coming into contact with the pre-fed fibers is only short and, as a rule, even shorter than the thread formation zone 104. This leads to short piecing and thus to short defects in the newly spun thread.
  • the required strength of the piecer is achieved by relative control of fiber feed, thread feed, speed of the friction spinning elements 100, 101 and insertion of the thread take-off. In this way, a thin spot following the attachment point in the thread can also be avoided.
  • the thread 30 which is now forming again is pulled off from the thread formation zone 104 by continuing the movement of the arm 700 with the thread clamp 70, this depending on the piecing speed, fiber material etc. after interrupting the feed and feed movement of the thread holding device 7 or in a continuous manner this feed and feed movement can happen.
  • the thread holding device 7 forms at the same time a thread guide 75 for the thread 30 and, as mentioned, prevents the end of the thread end 300 on the take-off side from getting into the wedge gap 102.
  • this thread holding device 7, which forms a thread guide 75 increases, however, the newly forming thread 30 is given the opportunity to lie in the wedge gap 102 over the full length of the thread forming zone 104, although the thread 30 initially spins the thread forming zone only with its free end reached.
  • the spool 400 is also lowered back onto the spooling roller 401 in a time-coordinated manner with respect to the processes described.
  • the bobbin 400 thus begins to rotate in the take-off direction and pull the thread 30 from the open-end friction spinning device 10.
  • the thread clamp 70 is now opened. Voltage fluctuations that occur due to slipping of the coil 400 which is accelerating are absorbed by the suction air flow acting in the suction pipe 52.
  • the suction pipe 52 stores the excess thread length until it is used up again by the tension delay when it winds up.
  • the thread 30 gets into the clamping line of the take-off device 4 due to the increasing thread tension, possibly supported by suitable thread guide elements (not shown). Simultaneously with the lowering of the spool 400, this is also done via the lifting magnet 60 repositioning the drive roller 122 on the drive belt 120, while at the same time the drive roller 540 of the auxiliary drive device 54 releases the drive belt 120 again. The friction spinning elements 100 and 101 are thus driven again by the tangential belt 12 of the machine.
  • the device described with reference to FIG. 1 can also be used in connection with a coil change.
  • the piecing can take place with the aid of auxiliary turns on the empty tube, so that the attachment takes place in the manner described.
  • the piecing and the remaining rest of the auxiliary windings can also be temporarily sucked off with the help of the suction tube 52, whereupon the newly spun thread 30 is transferred with this suction tube 52 to the empty tube, which can be done in a manner known per se with the aid of a catch nose (not shown) etc the winding device 40 can be supported.
  • an auxiliary spool 32 is seated on the maintenance carriage 5, from which the piecing thread 320 can be pulled off by the thread clamp 70.
  • the piecing thread 320 is guided by the auxiliary bobbin 32 via a thread guide 321 and a thread clamp 322 to the area where the piecing thread 320 can be gripped by the thread clamp 70.
  • the piecing thread 320 is guided by the thread clamp 70 through the separating device 53, where the piecing thread 320 receives the exact piecing length.
  • the piecing takes place as described.
  • the thread clamp 70 is moved during the piecing draw-off in the direction of the winding device 40 up to the area of the mouth 522 of the suction tube 52.
  • the thread clamp 70 is now controlled in such a way that it releases the thread 30, which is now sucked into the suction tube 52.
  • the suction tube 52 is pivoted to the winding device 40, where the thread 30 is transferred to the empty tube.
  • the thread 30 is picked up by the winding device 40, a certain length of thread is pulled out of the suction tube 52.
  • a cutting device 523 In the vicinity of the mouth 522 of the suction tube 52 there is a cutting device 523 which, after the thread 30 has been transferred to the empty tube, cuts off the thread end extending into the suction tube 52.
  • the thread 30 which was previously fed to the suction tube 52 forming a storage location by the thread clamp movable in the draw-off direction, was transferred to a newly inserted empty tube in the winding device 40.
  • an alternative embodiment of the piecing process described ensures that the outer surfaces of the friction spinning elements 100 and 101 are freed of residual fibers.
  • fibers are briefly fed to the stopped but suctioned friction spinning elements 100 and 101, even before the thread end 300 reaches the thread insertion slot 14.
  • the fiber feed and the suction of the friction spinning elements 100 and 101 are then set.
  • the fibers are then sucked out of the wedge gap 102. This can be done, for example, by folding the cover 103 away from the rest of the housing 13 with the friction spinning elements 100 and 101 and instead bringing a controllable suction bell (not shown) in front of the friction spinning elements 100, 101 from the maintenance carriage 5.
  • the two friction spinning elements 100, 101 are spread in a manner known per se, so that the fibers can be sucked off by means of a suction device, not shown, which is arranged on the side of the friction spinning elements 100 and 101 facing away from the fiber feed channel 24.
  • the temporary fiber feed results in an increase in the remaining fiber mass in the wedge gap 102, so that suctioning off the fibers is facilitated.
  • This cleaning of the friction spin elements 100 and 101 has the effect that the same piecing conditions are always achieved in the wedge gap regardless of the thread breakage-related residual fibers.
  • the piecing fiber is then fed in a manner that is timed to the previous interruption of the fiber feed, so that the fiber beard for piecing is always in the same state.
  • the insertion of the thread end 300 into the thread insertion slot 14 should therefore be selected in accordance with the time for the piecing fiber feed.
  • the control unit 6 via the lifting magnet 60, causes the drive roller 122 driven by the tangential belt 12 to be separated from the drive belt 120, as a result of which the latter stops.
  • the re-driving of the friction spinning elements 100 and 101 required during piecing then takes place from the maintenance carriage 5 via the auxiliary drive device 54.
  • the fiber feeding is switched on and the thread end 300 is fed into the wedge gap in the manner described.
  • the thread insertion slot 14 widens toward the outside 131 of the cover 130 in accordance with FIG.
  • the smallest angular distance ⁇ between the thread insertion slot 14 and the thread formation zone 104 is at least 90 °.
  • this angular distance ⁇ between the take-off end of the opening 143 of the thread insertion slot 14 opening on the inside 132 of the cover 130 from the thread formation zone 104 is even greater.
  • the thread insertion slot 14 includes an angle of inclination y of less than 90 ° with the direction of rotation (arrow P10) of the friction spinning element 101 screwing into the wedge gap 102.
  • the end of the thread end 300 on the draw-off side is prevented by the thread clamp 70 from entering the thread-forming zone 104, at least not until the end of this thread section facing away from the draw-off side has reached the thread-forming zone 104.
  • This effect can be supported or can be achieved solely by placing the thread end 300 obliquely on the friction spinning element 101 turning into the wedge gap 102 in such a way that the side facing away from the take-off side, i. H. free thread end has a smaller distance from the wedge gap 102 than the withdrawal-side end of this thread end 300 placed on the friction spinning element 101 at the same time.
  • the take-off end 140 of the thread insertion slot 14 is at a greater distance from the thread formation zone 104 than the end 141 of the thread insert slot 14 facing away from the take-off side.
  • the thread 30 can be presented in front of the thread insertion slot 14 by the thread clamp 70 in various ways. As shown in FIG. 1, the thread clamp 70 can be pivoted in both the horizontal and the vertical plane, so that the thread can also be fed to the thread insertion slot 14 from the side. In order to be able to use the thread clamp 70 as a take-off element for the duration of the piecing process, however, the thread clamp 70 in the area of the thread insertion slot 14 is usefully parallel-d. H.
  • the piecing position is selected in a very specific manner.
  • the thread 30 is brought to a defined length by the separating device 53 and is brought outside the wedge gap 102 into the length region of the thread formation zone 104, where it is still held by the thread clamp 70.
  • This piecing position is determined such that after switching on the fiber feed, the thread end 300 now sucked into the thread insertion slot 14 by applying the negative pressure to the suctioned friction spinning element 101 reaches the wedge gap 102 within the length range of the thread formation zone 104, but does not extend beyond it at any of its ends.
  • the thread 30 is placed in a precisely defined length on the fibers located in the wedge gap 102 and forming a rotating fiber bundle 31.
  • the compressed air nozzle 702 can be dispensed with, since the thread 30 is sucked in solely by the action of the negative pressure applied to the friction spinning element 101.
  • the compressed air nozzle 702 thus only acts as a support and enables the thread end 300 to be supplied to the wedge gap 102 more quickly and therefore more precisely in terms of time.
  • the thread clamp 70 is movable in the direction of the thread insertion slot 14. It has been shown that there are advantages for a safe piecing if the thread clamp 70 when the thread is inserted of the 300 in the thread insertion slot 14, ie when the thread end 300 is fed to the wedge gap 102, has different distances from the take-off end of the wedge gap 102 and thus the thread formation zone 104. For this reason, the thread clamp 70, ie its transfer position, is adjustable. The finer the thread, the greater the length of the thread end 300 located in the thread formation zone; conversely, the thread length located in the wedge gap 102 need not be so great for coarser yarns. This is due to the fact that the amount of fiber supplied per unit of time is smaller in the case of finer yarns than in the case of coarser yarns, so that the fiber mass required for sufficient strength of the piecer is only reached after a somewhat longer period of time.
  • the thread end 300 is placed later on the fibers located in the wedge gap 102 with respect to the switching on of the fiber feed for fine threads than for coarse threads.
  • a sufficient fiber mass can accumulate in the wedge gap 102 in this way, so that reliable piecing is ensured. This timing is done by appropriately controlling the movement of the arm 700 and the air nozzle 702.
  • a further supporting measure is an adapted control of the withdrawal of the thread 30 from the thread formation zone 104.
  • the thread 30, after it has passed the thread formation zone 104 has reached, only subject to a delay after a deduction. In the exemplary embodiment described, this is done by stopping the thread clamp 70 for inserting the thread end 300 into the thread insertion slot 14 and maintaining a certain downtime until the start of the pivoting movement of the thread clamp 70 causing the take-off. If the thread take-off is carried out after the thread 30 has been released by the bobbin 400, the time for lowering the bobbin 400 onto the winding roller 401 must be selected accordingly. In this case too, the delay until the thread pull-in is started is to be chosen larger for fine threads than for coarse threads.
  • the thread end 300 Since the thread end 300 is held at least for a certain time by the thread clamp 70 even after it has been fed to the wedge gap 1 02, it is ensured that the thread 30 first enters the thread formation zone 104 only with its free end and only then with its region on the take-off side. However, the thread end 300 can also be fed into the wedge gap 1 02 by releasing the clamping action of the thread clamp 70, the piecing draw-off then taking place through the bobbin 400, which is again lowered onto the spinning roller 401.
  • this contacting of the thread-side thread area with the thread formation zone 104 is to be prevented even longer after the thread clamp 70 has released it, this can be done with the help of a thread guide 73 in front of the friction spinning elements 100, 101 Fig. 2 happen, which can be brought from the position shown to the dashed position 73 '.
  • This thread guide can be formed, for example, by a bracket pivotable in the direction of arrow P9. As a result, the thread 30 drawn off from the thread formation zone 104 is moved in the direction of the fiber feed side, ie. H. to the side facing the fiber feed channel 24.
  • the thread insertion slot 14 is separated from the inside 132 of the cover 130 in its area facing away from the take-off side by a slot bottom 142.
  • this slotted base 142 forms an acute angle a with the inner wall of the cover 130.
  • a suction air nozzle 71 serves as the thread holding device 7, which opens into the end 141 of the thread insertion slot 14 from the side facing away from the take-off side.
  • the suction air nozzle 71 opens into the slot bottom 142 parallel to the thread formation zone 104.
  • the thread 30 is brought from the bobbin 400 up to the thread insertion slot 14 and is exposed to the effect of the controllable suction air flow in the suction air nozzle 71.
  • This suction air flow exerts an elastic restraining force on the thread 30 and, when released by the thread clamp 70, continues to pull it off until the thread 30 is stopped by stopping the bobbin 400 rotated back during the thread return.
  • the movable thread clamp 70 now releases the thread 30 so that it is held solely by the suction air nozzle 71.
  • a fixed thread clamp 72 is additionally provided as per rigid clamping element provided.
  • this has a rigid clamping element 720, with which a movable clamping element 721 (arrow P11) cooperates.
  • This movable clamping element 721 can be acted upon in one direction of movement by a lifting magnet 722 and acted upon in the opposite direction by a retaining spring 723.
  • the suction air in the suction air nozzle 71 is switched off and the thread 30 is released by the thread clamp 72, so that the thread end 300 due to the friction spinning element 101 acting vacuum is sucked into the thread insertion slot 14.
  • the thread end 300 slides along the slot bottom 142.
  • this slot bottom 142 is inclined at an acute angle a to the wedge gap 102.
  • the thread guide 73 shown in FIG. 2 is used for piecing from the position shown in FIG brought the position 73 '.
  • the thread clamp 72 can be adjusted in different positions parallel to the wedge gap 102 (arrows P12).
  • the thread 30 is pulled in a timed manner against the elastic retention force exerted by the suction air nozzle 71 on the thread 30 until the thread 30 leaves the effective range of the elastic retention force of this suction air nozzle 71 and through the thread insertion slot 14 onto the wedge gap fibers located in the thread formation zone 104 is placed.
  • the desired dwell time of the thread end 300 in the thread formation zone 104 can be determined.
  • a separating device 710 is provided in the suction air nozzle 71 according to the embodiment shown, which gives the returned thread 30 a defined length.
  • this separating device 710 causes the thread end, which has received an undefined length and shape as a result of the pneumatic return delivery and holding by unscrewing and sucking out individual fibers, again taking on a defined shape.
  • the cover 130 carries an initiator 80 for controlling a closure element 8, by means of which the thread insertion slot 14 is covered during the standstill of the spinning station 1 and during the normal spinning process.
  • the closure member 8 extends parallel to the thread insertion slot 14 essentially over its entire length and is connected to the armature 810 of a lifting magnet 81, which in turn is in control connection with the initiator 80 via the control member 6.
  • the initiator 80 is arranged on the cover 130 in such a way that the closure member 8 immediately releases the thread insertion slot 14 when the arm 700 moved in the direction of the suction air nozzle 71 reaches the cover 130. Its arrangement at the trigger-side or opposite end of the cover 130 thus depends on the feed direction of the thread 30.
  • a switching flag 74 is provided on the cover, which triggers a pulse on the arm 700 in a switch (not shown) designed as an initiator when the thread clamp 700 has reached its transfer position.
  • This second initiator causes the thread clamp 70 to open, so that the thread 30 can be sucked into the suction air nozzle 71.
  • this second initiator can be connected to a control device for controlling the piecing process and can be used to trigger the piecing program.
  • the closure member 8 can be controlled from the maintenance carriage 5 which can be moved along the machine. If, however, a device for mass piecing a plurality of open-end friction spinning devices 10 is provided, this closure member 8 can also be controlled centrally from a machine-side control device.
  • the subject matter of the invention can be modified in many ways and is therefore not limited to the exemplary embodiments shown. Further modifications are possible by exchanging features with one another or by replacing them with equivalents and combinations thereof and fall within the scope of the present invention.
  • the invention is not restricted to the design of a thread return device designed as a thread clamp 70, since instead of this thread clamp 70 a pneumatic gripper can also be used.
  • the fiber feed channel 24 opens directly into the thread formation zone 104, while the thread insertion slot 14 opens towards the peripheral surface of the suctioned friction spinning element 101; with appropriate timing of fiber supply and thread return, it can also be provided that the fibers are fed onto the outer surface of the friction spinning element 101 and brought into the thread formation zone 104 by its rotation, while the thread insertion slot opens directly into the thread formation zone 104.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

In order to join the threads on an open-end friction spinning device with two friction spinning elements (101) driven in the same direction and forming a suction-type tapered gap, the thread (30) is fed to the gap in such a way that the thread (30) first reaches the thread-forming region (104) with its free end. The feeding of the fibres into the tapered gap is controlled in such a way that the end of the thread (300) comes in contact with the fibres simultaneously with arrival in the thread-forming region (104). The friction spinning elements (101) are covered with a shroud (130) which forms a fibre-feeding duct (24). The shroud has, in addition to the fibre-feeding duct (24), a thread insertion slit (14) which extends essentially in the longitudinal direction of the friction spinning element (101). This extends from the outer side of the shroud (130) to its inner side and from the end of the withdrawal side up to a maximum distance of the end of the opening (240) which faces away from the withdrawal side. Outside the tapered gap a thread-holding device (7) is installed, which maintains the thread (3) essentially parallel to the thread input slit (14). This keeps the thread (30), at the withdrawal end of the friction element (101), away from the tapered opening until the end of the thread (30) has reached the tapered gap.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Anspinnen einer Offenend-Friktionsspinnvorrichtung, welche zwei gleichsinnig angetriebene und einen besaugten Keilspalt bildende Friktionsspinnelemente aufweist, bei welchem ein Fadenende in eine ausserhalb des Keilspaltes vorgesehene Anspinnstellung geliefert und aus dieser heraus in eine Fadenbildungszone im Keilspalt überführt wird, von wo es unter Einbindung von dem Keilspaltzugeführten Fasern als fortlaufender Faden wieder abgezogen wird, sowie eine Vorrichtung zur Durchführung dieses Verfahrens.The present invention relates to a method for piecing an open-end friction spinning device which has two friction spinning elements which are driven in the same direction and form a suction wedge gap, in which a thread end is delivered to a piecing position provided outside the wedge gap and is transferred out of this into a thread formation zone in the wedge gap where it is drawn off again as a continuous thread with the inclusion of the fibers fed to the wedge gap, and a device for carrying out this method.

Bei einem bekannten Verfahren dieser Art wird das Fadenende mit Hilfe einer Führungsvorrichtung bei geöffneter Abdeckung ausserhalb des Keilspaltes bis in eine Saugdüse zurückgeliefert (DE-OS 3.318.266). Durch eine geeignete Bewegung oder einen entsprechenden Antrieb der Führungsvorrichtung wird ein Zwischenabschnitt des Fadens in den Keilspalt der zuvor stillgesetzten Friktionsspinnelemente überführt. Sodann wird die Abdeckung geschlossen und der Fadenabzug eingeschaltet. Anschliessend werden die Friktionsspinnelemente wieder angetrieben und die Faserspeisung so eingeschaltet, dass die Fasern gleichzeitig mit dem Fadenende den Keilspalt erreichen. Da die gewünschte Liefermenge nicht schlagartig in den Keilspalt gelangt, sondern lediglich allmählich, kann im Anschluss an das mit den Fasern verbundene Fadenende eine Dünnstelle nicht vermieden werden. Eine solche Dünnstelle führt aufgrund der geringeren Festigkeit zu erhöhten Fadenbruchzahlen. Setzt die Faserspeisung jedoch ein, bevor das Fadenende aus der Saugdüse herausgezogen und in den Keilspalt gelangt ist, so entsteht ein langer, eine Dickstelle bildender Ansetzer, der aus optischen Gründen nicht gewünscht ist.In a known method of this type, the thread end is returned with the aid of a guide device with the cover open outside the wedge gap to a suction nozzle (DE-OS 3.318.266). By means of a suitable movement or a corresponding drive of the guide device, an intermediate section of the thread is transferred into the wedge gap of the friction spinning elements which have previously been shut down. The cover is then closed and the thread take-off is switched on. The friction spinning elements are then driven again and the fiber feed is switched on in such a way that the fibers reach the wedge gap at the same time as the thread end. Since the desired delivery quantity does not suddenly get into the wedge gap, but only gradually, a thin spot cannot be avoided after the thread end connected to the fibers. Such a thin spot leads to increased thread breakage numbers due to the lower strength. However, if the fiber feed starts before the thread end has been pulled out of the suction nozzle and into the wedge gap, a long, thick-pieced piecing is created which is not desired for optical reasons.

Aufgabe der Erfindung ist es daher, ein Verfahren und eine Vorrichtung zu schaffen, um eine Offenend-Friktionsspinnvorrichtung sicher anzuspinnen und dabei die durch das Anspinnen erzeugte Fehlstelle im angesponnenen Faden klein zu halten.It is therefore an object of the invention to provide a method and a device for reliably spinning on an open-end friction spinning device and thereby keeping the defect in the spun thread that is created by the spinning small.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass der Faden dem Keilspalt in der Weise zugeführt wird, dass der Faden die Fadenbildungszone zuerst mit seinem freien Fadenende erreicht, und die Zuführung der Fasern in den Keilspalt derart gesteuert wird, dass das Fadenende gleichzeitig mitdem Erreichen der Fadenbildungszone in Kontakt mit den Fasern gelangt. Der mit den Fasern in Berührung kommende Fadenbereich ist somit recht kurz.This object is achieved according to the invention in that the thread is fed to the wedge gap in such a way that the thread first reaches the thread formation zone with its free thread end, and the feed of the fibers into the wedge gap is controlled in such a way that the thread end simultaneously with reaching the thread formation zone comes into contact with the fibers. The area of the thread that comes into contact with the fibers is therefore quite short.

Dieser Fadenbereich wird nun aus dem Keilspalt abgezogen und bindet dabei die in den Keilspalt gespeisten Fasern ein. Da das Fadenende erst bei Erreichen der Fadenbildungszone in Kontakt mit den Fasern gelangt und sich bei Beginn des Spinnvorganges bereits im Keilspalt befindet und nicht erst in diesen hineingebracht werden muss, nachdem ein anderer Fadenbereich bereits mit dem Einbinden von Fasern begonnen hat, ist die Fehlstelle im neu angesponnenen Faden sehr kurz und unterschreitet in der Regel sogar die Länge der Faseraufspeisezone, welche durch die Länge der Mündung des Faserspeisekanals festgelegt ist. Dabei ist die Dickstelle im Ansetzer sogar noch kürzer, da nicht die gesamte Länge des in den Längenbereich der Friktionsspinnelemente rückgelieferten Fadens in den Keilspalt gelangt, sondern lediglich der der Abzugsseite abgewandte Endabschnitt des Fadens. Eine Dünnstelle im Anschluss an den Ansetzer kann durch zeitliche Steuerung des Einsetzens der Faserspeisung vermieden werden, die unabhängig von der Fadenzuführung in den Keilspalt gesteuert werden kann.This thread area is now drawn off from the wedge gap and thereby binds in the fibers fed into the wedge gap. Since the thread end only comes into contact with the fibers when the thread formation zone is reached and is already in the wedge gap at the start of the spinning process and does not have to be inserted into this after another thread area has already started to bind fibers, the fault is in newly spun thread very short and usually even falls short of the length of the fiber feed zone, which is determined by the length of the mouth of the fiber feed channel. The thick point in the piecing is even shorter since not the entire length of the thread returned to the length of the friction spinning elements reaches the wedge gap, but only the end section of the thread facing away from the take-off side. A thin spot following the piecing can be avoided by timing the insertion of the fiber feed, which can be controlled independently of the thread feed into the wedge gap.

Das erfindungsgemässe Verfahren, gemäss welchem der Faden die Fadenbildungszone zuerst mit seinem freien Ende erreicht, soll im Sinne der vorliegenden Erfindung auch ein solches Verfahren mit einschliessen, bei welchem vom zurückgelieferten Faden lediglich der Endabschnitt die Fadenbildungszone erreicht und der Fadenbereich zwischen diesem Endabschnitt und dem abzugsseitigen Ende des Keilspaltes überhaupt nicht in die Fadenbildungszone gelangt. In diesem Fall gelangt nach erfolgtem Ansetzen das bisherige Fadenende, das jetzt diesen Zwischenbereich des Fadens bildet, bei der Abzugsbewegung des Fadens in diesen abzugsseitigen Bereich des Keilspaltes, d. h. ebenfalls erst später, als das Fadenende für das Anspinnen der Fadenbildungszone zugeführt worden ist.The method according to the invention, according to which the thread first reaches the thread formation zone with its free end, is also intended to include a method in the sense of the present invention in which only the end portion of the returned thread reaches the thread formation zone and the thread region between this end portion and the take-off side End of the wedge gap does not get into the thread formation zone at all. In this case, after the attachment has taken place, the previous thread end, which now forms this intermediate region of the thread, comes into this region of the wedge gap on the pull-off side during the pull-off movement of the thread. H. likewise only later, when the thread end has been fed to the thread formation zone for piecing.

Um Dünnstellen im Ansetzer zu vermeiden, ist erfindungsgemäss vorteilhafterweise vorgesehen, dass die Zuführung von Fasern in den Keilspalt einsetzt, bevor das Fadenende die Fadenbildungszone erreicht hat. Das Fadenende wird somit auf die im Keilspalt angesammelte Fasermasse aufgelegt, welche nun zusammen mit neu zugeführten Fasern in das Fadenende eingebunden wird. Hierdurch lässt sich die in den Ansetzer einzubindende Fasermenge auf einfache Weise festlegen.In order to avoid thin spots in the piecing, it is advantageously provided according to the invention that the supply of fibers starts in the wedge gap before the thread end has reached the thread formation zone. The thread end is thus placed on the fiber mass collected in the wedge gap, which is now integrated into the thread end together with newly added fibers. In this way, the amount of fibers to be integrated in the piecer can be determined in a simple manner.

Es hat sich gezeigt, dass nach Unterbrechen der Faserzufuhr zum Keilspalt stets noch Fasern, die noch aus dem bis in den Kämmbereich der Auflösevorrichtung reichenden Faserbart ausgekämmt werden bzw. welche sich noch in der Garnitur der Auflösewalze befinden, in den Keilspalt gelangen. Diese Fasern unterliegen jedoch keinem Abzug mehr und können so zu einer Beschädigung der Friktionsspinnelemente führen. Aus diesem Grunde wird erfindungsgemäss so verfahren, dass bei Auftreten eines Fadenbruches nicht nur die Faserzufuhr zu den Friktionsspinnelementen unterbrochen, sondern gleichzeitig auch die Friktionsspinnelemente stillgesetzt werden, und dass während der Rücklieferung des Fadens in die Anspinnstellung ausserhalb des Keilspaltes die Friktionsspinnelemente wieder angetrieben werden, woraufhin die Zuführung von Fasern in den Keilspalt freigegeben wird.It has been shown that, after the fiber supply to the wedge gap has been interrupted, fibers which are still combed out from the fiber beard reaching into the combing area of the opening device or which are still in the clothing of the opening roller, enter the wedge gap. However, these fibers are no longer subject to any deduction and can thus damage the friction spinning elements. For this reason, the method according to the invention is such that when a thread break occurs, not only is the fiber supply to the friction spinning elements interrupted, but at the same time the friction spinning elements are stopped, and that during the return of the thread to the piecing position outside the wedge gap, the friction spinning elements are driven again, whereupon the supply of fibers in the wedge gap is released.

Um beim Anspinnen definierte Verhältnisse zu haben, werden gemäss einer bevorzugten Ausgestaltung des erfindungsgemässen Verfahrens bei stillgesetzten Friktionsspinnelementen dem besaugten Keilspalt kurzzeitig Fasern zugeführt, woraufhin die Besaugung des Keilspaltes aufgehoben wird und die Fasern aus dem Keilspalt abgesaugt werden; anschliessend werden die Friktionsspinnelemente wieder angetrieben, und in zeitlich auf das vorangegangene Unterbrechen der Faserzufuhr abgestimmter Weise wird die Zuführung von Fasern in den Keilspalt wieder freigegeben.In order to have defined ratios during piecing, according to a preferred embodiment of the method according to the invention, when the friction spinning elements have stopped, fibers are briefly fed to the suctioned wedge gap, where then the wedge gap is removed and the fibers are sucked out of the wedge gap; the friction spinning elements are then driven again, and the supply of fibers into the wedge gap is released again in a manner coordinated with the previous interruption of the fiber supply.

Damit beim Anspinnen ein grösserer Zeitraum zur Verfügung steht, wird zweckmässigerweise in weiterer Ausgestaltung des erfindungsgemässen Verfahrens vorgesehen, dass die Friktionsspinnelemente während der Zuführung des Fadenendes in die Fadenbildungszone bis nach Einsetzen des Fadenabzuges mit reduzierter Drehgeschwindigkeit angetrieben werden.In order that a longer period of time is available during piecing, it is expediently provided in a further embodiment of the method according to the invention that the friction spinning elements are driven at a reduced rotational speed during the feeding of the thread end into the thread formation zone until after the thread take-off has been inserted.

Es ist auf verschiedene Weise möglich, den Faden dem Keilspalt so zuzuführen, dass der Faden zuerst oder auch allein mit seinem freien Ende in die Fadenbildungszone gelangt. In einfacher Weise geschieht dies dadurch, dass der Faden von der Fadenbildungszone derart abgezogen wird, dass er in Richtung zur Faserzuführseite umgelenkt wird.It is possible in various ways to feed the thread to the wedge gap in such a way that the thread reaches the thread formation zone first or even with its free end. This happens in a simple manner in that the thread is drawn off from the thread formation zone in such a way that it is deflected in the direction of the fiber feed side.

Gemäss einer weiteren vorteilhaften Ausgestaltung des erfindungsgemässen Verfahrens wird der Faden dem Keilspalt radial in der Weise zugeführt, dass der Faden ausserhalb des Keilspaltes auf das sich in den Keilspalt hineindrehende Friktionsspinnelement aufgelegt und durch dieses Friktionsspinnelement dem Keilspalt zugeführt wird. Ein solches Verfahren ist luftsparend. Hierbei wird vorzugsweise so verfahren, dass das Fadenende schräg auf das sich in den Keilspalt hineindrehende Friktionselement aufgelegt wird in der Weise, dass das freie Fadenende einen geringeren Abstand vom Keilspalt aufweist als der sich am abzugsseitigen Ende dieses Friktionsspinnelementes befindende Fadenabschnitt.According to a further advantageous embodiment of the method according to the invention, the thread is fed radially to the wedge gap in such a way that the thread is placed outside the wedge gap on the friction spinning element which rotates into the wedge gap and is fed to the wedge gap by this friction spinning element. Such a process is air-saving. In this case, the procedure is preferably such that the thread end is placed obliquely on the friction element which rotates into the wedge gap in such a way that the free thread end is at a smaller distance from the wedge gap than the thread section located at the end of this friction spinning element on the take-off side.

Gemäss einem bevorzugten Verfahren wird die Anspinnstellung so gewählt, dass der in die Anspinnstellung gebrachte und in die Fadenbildungszone überführte Faden, bevor er einem Abzug unterworfen wird, lediglich bis in den Bereich der Fadenbildungszone reicht, welchem die Fasern zugeführt werden. Da das Fadenende bereits in dem Augenblick, in welchem es die Fadenbildungszone erreicht, nicht über deren Bereich, welchem die Fasern zugeführt werden, hinausreicht, kann die Faserspeisung auch schon einsetzen, bevor der anzuspinnende Faden in die Fadenbildungszone gelangt. Diese Möglichkeit des Vorspeisens bringt den Vorteil mit sich, dass für das Einsetzen der Faserspeisung ein relativ grosser Zeitraum zur Verfügung steht.According to a preferred method, the piecing position is selected such that the thread brought into the piecing position and transferred into the thread-forming zone, before being subjected to a draw-off, only extends into the area of the thread-forming zone to which the fibers are fed. Since the thread end does not extend beyond the area to which the fibers are fed at the moment it reaches the thread formation zone, the fiber feed can also start before the thread to be spun enters the thread formation zone. This possibility of starter has the advantage that a relatively long period of time is available for the insertion of the fiber feed.

Zweckmässigerweise wird dabei so verfahren, dass der Faden auf eine definierte Länge gebracht, um eine definierte Strecke ausserhalb des Keilspaltes bis in den Längenbereich der Fadenbildungszone zurückgeliefert und das Fadenende in dieser Stellung durch Klemmung gehalten wird, dass daraufhin dem Keilspalt Fasern zugeführt und sodann der Faden auf die sich im Keilspalt befindenden Fasern aufgelegt wird. Auf diese Weise lässt sich der Anspinnvorgang in einfacher Weise präzise steuern.Appropriately, the procedure is such that the thread is brought to a defined length, is returned a defined distance outside the wedge gap into the length range of the thread formation zone and the thread end is held in this position by clamping, so that fibers are then fed to the wedge gap and then the thread is placed on the fibers in the wedge gap. In this way, the piecing process can be precisely controlled in a simple manner.

Da bei feineren Fäden aufgrund des hierfür erforderlichen Verhältnisses zwischen Faserliefergeschwindigkeit und Fadenabzugsgeschwindigkeit weniger Fasern zum Anspinnen zur Verfügung stehen und hierdurch die Gefahr erhöhter Fadenbruchzahlen während des Ansetzens besteht, wird gemäss einer weiteren Ausgestaltung des erfindungsgemässen Verfahrens vorgesehen, dass die Klemmung des Fadenendes bei feinen Fäden in grösserer Entfernung von dem abzugsseitigen Ende des Keilspaltes erfolgt als bei groben Fäden. Somit befinden sich feinere Fäden länger im Keilspalt als gröbere Fäden, wodurch für die Dauer des Ansetzens die Unterschiede der Geschwindigkeitsverhältnisse zwischen Faserspeisung und Fadenabzug etwas kompensiert werden. Die Anspinnsicherheit wird damit erhöht.Since, in the case of finer threads, fewer fibers are available for spinning due to the ratio between fiber delivery speed and thread take-off speed required for this, and there is therefore a risk of increased thread breakage during attachment, according to a further embodiment of the method according to the invention it is provided that the thread end is clamped in fine threads greater distance from the take-off end of the wedge gap than with coarse threads. This means that finer threads are in the wedge gap longer than coarse threads, which means that the differences in the speed relationships between fiber feed and thread take-off are somewhat compensated for during the preparation. The piecing security is increased.

Das Ansetzen kann so erfolgen, dass das freie Fadenende in den Keilspalt gelangt, während der Faden noch immer von der Klemme gehalten wird. Auf diese Weise wird sichergestellt, dass stets das Fadenende früher als das dem Abzugsende des Keilspaltes zugewandten Fadenbereichs in den Keilspalt gelangt. Es hat sich jedoch als besonders vorteilhaft erwiesen, wenn für das Auflegen des Fadenendes auf die im Keilspalt befindlichen Fasern die Klemmung des Fadens aufgehoben wird. Dies ermöglicht bei kompakter Bauweise der Friktionsspinnvorrichtung eine präzise Steuerung.The attachment can take place in such a way that the free thread end reaches the wedge gap while the thread is still held by the clamp. In this way it is ensured that the thread end always reaches the wedge gap earlier than the thread region facing the withdrawal end of the wedge gap. However, it has proven to be particularly advantageous if the thread is released from the fibers in the wedge gap when the thread end is placed on it. With the compact design of the friction spinning device, this enables precise control.

Ein genaues Einsetzen des Fadenabzuges wird in alternativer Ausgestaltung des erfindungsgemässen Verfahrens dadurch erreicht, dass der Faden durch eine in Fadenabzugsrichtung bewegliche Klemmstelle zunächst dem Keilspalt zum Ansetzen zugeführt und sodann, ohne dass der Faden durch diese Klemmstelle freigegeben wird, durch diese bewegliche Klemmstelle vom Keilspalt abgezogen wird.In an alternative embodiment of the method according to the invention, exact insertion of the thread take-off is achieved by first feeding the thread to the wedge gap by means of a clamping point movable in the thread take-off direction and then, without the thread being released by this clamping point, being pulled off the wedge gap by this movable clamping point becomes.

Zweckmässigerweise wird der vom Keilspalt abgezogene Faden durch die bewegliche Klemme an eine Speicherstelle übergeben, die Abzugsschwankungen bei Übernahme des Abzuges durch die Abzugsvorrichtung, die den normalen Spinnabzug durchführt, ausgleicht. In gleicher Weise lässt sich eine solche Speicherstelle auch benützen, um beim Übergeben des Fadens von der beweglichen Klemmstelle an die Spule die überschüssigen Fadenlängen zwischenzuspeichern.The thread drawn off from the wedge gap is expediently passed through the movable clamp to a storage location, which compensates for fluctuations in take-off when the take-off is taken over by the take-off device which carries out the normal spinning take-off. In the same way, such a storage location can also be used to temporarily store the excess thread lengths when the thread is transferred from the movable clamping point to the bobbin.

In Verbindung mit einem Spulenwechsel wird erfindungsgemäss vorteilhafterweise der in die Anspinnstellung zu bringende Faden durch die in Abzugsrichtung bewegliche Klemmstelle zunächst dem Keilspalt und dann der Speicherstelle zugeführt, von wo aus der Faden an eine neu eingelegte Leerhülse übergeben wird.In connection with a bobbin change, according to the invention, the thread to be brought into the piecing position is first fed to the wedge gap and then to the storage location by the clamping point movable in the draw-off direction, from where the thread is transferred to a newly inserted empty tube.

Das Zuführen des Fadensvon der Klemmstelle in den Keilspalt erfolgt durch die an den Friktionsspinnelementen wirksame Saugluft. Diese Fadenzuführung zum Keilspalt kann erfindungsgemäss durch einen in den Keilspalt gerichteten Druckluftstrom unterstützt werden.The thread is fed from the nip into the wedge gap by the suction air acting on the friction spinning elements. According to the invention, this thread feed to the wedge gap can be supported by a compressed air flow directed into the wedge gap.

Gemäss einer weiteren vorteilhaften Ausgestaltung des erfindungsgemässen Verfahrens kann das Anspinnen dadurch erfolgen, dass der Faden auf eine definierte Länge gebracht, um eine definierte Strecke ausserhalb des Keilspaltes über das der Abzugsseite abgewandte Ende der Fadenbildungszone hinaus bis in den Wirkungsbereich einer elastischen Rückhaltekraft zurückgeliefert wird, dass daraufhin dem Keilspalt Fasern zugeführt werden und der Faden entgegen der elastischen Rückhaltekraft abgezogen und nach Verlassen des Wirkungsbereichs der elastischen Rückhaltekraft auf die sich im Keilspalt befindenden Fasern aufgelegt wird.According to a further advantageous embodiment of the method according to the invention the threading is carried out by bringing the thread to a defined length, by a defined distance outside the wedge gap beyond the end of the thread formation zone facing away from the take-off side, back into the effective range of an elastic retention force, so that fibers are then fed to the wedge gap and the thread subtracted against the elastic retention force and after leaving the effective range of the elastic retention force is placed on the fibers located in the wedge gap.

Zur Erhöhung der Anspinnsicherheit beim Anspinnen feiner Fäden wird vorteilhafterweise vorgesehen, dass das Auflegen des Fadens auf die sich im Keilspalt befindenden Fasern bei feinen Fäden später erfolgt als bei groben Fäden. Auf diese Weise können über eine relativ lange Zeitdauer Fasern vorgespeist werden, so dass für das Anspinnen trotz der geringen Faserliefermenge pro Zeiteinheit genügend Fasern zur Verfügung stehen. Dies kann erfindungsgemäss noch dadurch unterstützt werden, dass der Faden nach Erreichen der Fadenbildungszone nur verzögert einem Abzug unterworfen wird.To increase the piecing security when piecing fine threads, it is advantageously provided that the thread is placed later on the fibers located in the wedge gap with fine threads than with coarse threads. In this way, fibers can be pre-fed over a relatively long period of time, so that enough fibers are available for piecing in spite of the small fiber delivery quantity per unit of time. According to the invention, this can be further supported by the fact that the thread is subjected to a drawdown only after a delay after reaching the thread formation zone.

Zur Durchführung des Verfahrens besitzt die Offenend-Friktionsspinnvorrichtung eine Abdekkungfür die Friktionsspinnelemente, welche einen Faserspeisekanal und neben dem Faserspeisekanal einen sich im wesentlichen in Längsrichtung der Friktionsspinnelemente erstreckenden Fadeneinlegeschlitz aufweist, welcher von der Aussenseite der Abdeckung bis zu deren Innenseite und von dem abzugsseitigen Ende bis maximal zu dem der Abzugsseite abgewandten Mündungsende des Faserspeisekanals reicht, wobei ausserhalb des Keilspaltes eine den Faden im wesentlichen parallel zum Fadeneinlegeschlitz haltende Fadenhaltevorrichtung angeordnet ist und ferner eine Fadenführung vorgesehen ist, welche den Faden am abzugsseitigen Ende der Friktionsspinnelemente dem Keilspalt fernhält, solange das Fadenende den Keilspalt nicht erreicht hat. Der Fadeneinlegeschlitz ermöglicht, dass der Faden während seiner Rücklieferung in die Anspinnstellung ausserhalb der Fadenbildungszone verbleiben und bei geschlossenerAbdeckung aus dieserAnspinnstellung heraus der Fadenbildungszone zugeführt werden kann. Zum sicheren Einführen des Fadens in diesen Fadeneinlegeschlitz wird der Faden durch die Fadenhaltevorrichtung parallel zum Fadeneinlegeschlitz gehalten. Diese Fadenhaltevorrichtung ist so angeordnet und wird so gesteuert, dass sie zusammen mit einer Fadenführung den Faden in solcher Weise freigibt, dass dieser zunächst oder allein mit seinem freien Ende die Fadenbildungszone erreicht, während der Fadenabschnitt zwischen dem Fadenende und dem abzugsseitigen Ende des Keilspaltes verzögert oder überhaupt nicht in die Fadenbildungszone gelangt.To carry out the method, the open-end friction spinning device has a cover for the friction spinning elements, which has a fiber feed channel and, in addition to the fiber feed channel, a thread insertion slot which extends essentially in the longitudinal direction of the friction spinning elements and which extends from the outside of the cover to its inside and from the end on the trigger side to a maximum extends to the mouth end of the fiber feed channel facing away from the take-off side, a thread holding device holding the thread essentially parallel to the thread insertion slot being arranged outside the wedge gap and a thread guide is also provided which keeps the thread at the take-off end of the friction spinning elements away from the wedge gap as long as the thread end keeps the wedge gap has not reached. The thread insertion slot enables the thread to remain outside the thread formation zone during its return to the piecing position and, when the cover is closed, can be fed out of this piecing position to the thread formation zone. For safe insertion of the thread into this thread insertion slot, the thread is held parallel to the thread insertion slot by the thread holding device. This thread holding device is arranged and controlled in such a way that, together with a thread guide, it releases the thread in such a way that it reaches the thread formation zone first or only with its free end, while the thread section between the thread end and the takeoff-side end of the wedge gap decelerates or does not get into the thread formation zone at all.

Die Fadenführung kann unterschiedlich ausgebildet sein und unter Umständen auch durch die Fadenhaltevorrichtung selber gebildet werden. Gemäss einer einfachen Ausgestaltung des Erfindungsgegenstandes ist die Fadenführung als Umlenkung ausgebildet, welche den die Friktionsspinnelemente verlassenden Faden in Richtung zur Abdeckung umlenkt.The thread guide can be designed differently and may also be formed by the thread holding device itself. According to a simple embodiment of the subject matter of the invention, the thread guide is designed as a deflection, which deflects the thread leaving the friction spinning elements in the direction of the cover.

Auch der Fadeneinlegeschlitz kann verschieden ausgebildet sein. So kann es je nach Ausbildung der Fadenhaltevorrichtung von Vorteil sein, wenn der Fadeneinlegeschlitz im Anschluss an seinen sich von der Aussenseite der Abdeckung bis zu deren Innenseite erstreckenden Bereich einen sich hieran auf der der Abzugsseite abgewandten Seite anschliessenden Bereich aufweist, der durch einen Schlitzboden von der Innenseite der Abdekkung getrennt ist, wobei dieser Schlitzboden zweckmässigerweise einen spitzen Winkel mit der Innenwand der Abdeckung einschliesst. Dies ist insbesondere dann zweckmässig, wenn die Fadenhaltevorrichtung als Saugluftdüse ausgebildet ist, die in das der Abzugsseite abgewandte Ende des Fadeneinlegeschlitzes einmündet. Diese Saugluftdüse nimmt den rückgelieferten Faden zunächst auf und gibt ihn nach Einsetzen des Fadenabzuges allmählich wieder frei, wobei der Faden durch eine Fadenführung daran gehindert wird, dass er in die Fadenbildungszone gelangt. Dies ist nur dem Fadenende nach Freigabe durch die Saugluftdüse möglich.The thread insertion slot can also be designed differently. Depending on the design of the thread holding device, it may be advantageous if the thread insertion slot, following its area that extends from the outside of the cover to the inside thereof, has an area adjoining it on the side facing away from the take-off side, which area has a slot bottom from the side The inside of the cover is separated, this slot bottom expediently forming an acute angle with the inner wall of the cover. This is particularly expedient if the thread holding device is designed as a suction air nozzle which opens into the end of the thread insertion slot facing away from the take-off side. This suction air nozzle initially picks up the returned thread and gradually releases it again after the thread draw has been inserted, the thread being prevented by a thread guide from entering the thread formation zone. This is only possible at the end of the thread after release by the suction air nozzle.

Zur Erzielung einer platzgünstigen Ausbildung des Erfindungsgegenstandes ist es vorteilhaft, wenn die Saugluftdüse im Schlitzboden angeordnet ist. Zweckmässigerweise mündet dabei die Saugluftdüse parallel zur Fadenbildungszone in den Schlitzboden.To achieve a space-saving design of the subject matter of the invention, it is advantageous if the suction air nozzle is arranged in the slot bottom. The suction air nozzle expediently opens into the slot bottom parallel to the thread formation zone.

Die vorliegende Erfindung ist jedoch nicht an eine bestimmte Ausbildung der Fadenhaltevorrichtung gebunden. So ist diese gemäss einer bevorzugten Ausführung als Fadenklemme ausgebildet. Vorteilhafterweise ist dieser Fadenklemme eine Trennvorrichtung zugeordnet, die dem Faden eine definierte Länge und Form verleiht.However, the present invention is not tied to a specific design of the thread holding device. According to a preferred embodiment, this is designed as a thread clamp. This thread clamp is advantageously assigned a separating device which gives the thread a defined length and shape.

Besonders vorteilhaft ist eine derartige Ausbildung des Erfindungsgegenstandes, bei welcher die Fadenklemme aus einer Fadenaufnahmestellung zur Aufnahme eines von einer Spule abgezogenen Fadens in eine Fadenübergabestellung zum Überführen des Fadens in den Fadeneinlegeschlitz bewegbar ist. Zur Steuerung des Anspinnvorganges kann dabei die bewegliche Fadenklemme einen Schalter tragen, welcher mit einer Steuervorrichtung zur Steuerung des Anspinnvorganges in Verbindung steht und von der Abdeckung aus bei Erreichen der Fadenübergabestellung betätigbar ist.Such an embodiment of the subject matter of the invention is particularly advantageous in which the thread clamp can be moved from a thread take-up position for receiving a thread drawn off a bobbin into a thread transfer position for transferring the thread into the thread insertion slot. To control the piecing process, the movable thread clamp can carry a switch which is connected to a control device for controlling the piecing process and can be actuated from the cover when the thread transfer position is reached.

Vorzugsweise ist die Fadenklemme längs des Fadeneinlegeschlitzes bewegbar, wobei die Fadenklemme zur Übergabe des Fadens an den Fadeneinlegeschlitz in Richtung des Fadenabzuges bis zur Mündung eines zwischen den Friktionsspinnelementen und einer Spulvorrichtung angeordneten pneumatischen Speichers bewegbar und derart steuerbar ist, dass die Fadenklemme den Faden erst im Bereich des pneumatischen Speichers freigibt. Hierdurch werden auf einfache Weise definierte Anspinnverhältnisse erzielt, da sowohl die Fadenzuführung in die Fadenbildungszone als auch der Abzug des angesponnenen Fadens aus dieser Fadenbildungszone durch ein und dasselbe Element, nämlich die Fadenklemme, bewirkt wird.The thread clamp can preferably be moved along the thread insertion slot, the thread clamp for transferring the thread to the thread insertion slot in the direction of the thread take-off as far as the mouth of a pneumatic store arranged between the friction spinning elements and a winding device, and being controllable in such a way that the thread clamp only reaches the thread releases the pneumatic memory. In this way, defined piecing ratios are achieved in a simple manner, since both the thread feed into the thread bil tion zone as well as the withdrawal of the spun thread from this thread formation zone by one and the same element, namely the thread clamp.

Für das Durchführen eines neuen Spulenbeginns kann es vorteilhaft sein, wenn zum Anspinnen ein Hilfsfaden zur Verfügung steht. Aus diesem Grunde kann erfindungsgemäss vorgesehen sein, dass auf einem längs einer Vielzahl von Offenend-Friktionsspinnvorrichtungen verfahrbaren Wartungswagen eine Hilfsspule angeordnet ist, von welcher aus der Faden der Fadenklemme zuführbar ist. Hierzu kann sich die Fadenklemme selber die für das Anspinnen benötigte Fadenlänge holen; es kann aber auch eine separate Zuführvorrichtung zu diesem Zweck vorgesehen sein, wobei je nach Ausbildung der Vorrichtung der sich zur Hilfsspule erstreckende Faden bei jedem Anspinnvorgang zwischen Hilfsspule und Fadenklemme auch durchtrennt werden kann.When starting a new bobbin, it can be advantageous if an auxiliary thread is available for spinning. For this reason it can be provided according to the invention that an auxiliary spool is arranged on a maintenance carriage which can be moved along a plurality of open-end friction spinning devices, from which the thread can be fed to the thread clamp. For this purpose, the thread clamp itself can fetch the thread length required for piecing; however, a separate feed device can also be provided for this purpose, and depending on the design of the device, the thread extending to the auxiliary bobbin can also be severed between the auxiliary bobbin and the thread clamp during each piecing process.

Zur Unterstützung des Einlegens des Fadens in den Fadeneinlegeschlitz kann sowohl einer stationären als auch einer beweglichen Fadenklemme eine in den Fadeneinlegeschlitz gerichtete Druckluftdüse zugeordnet sein, welche den Faden in den Fadeneinlegeschlitz bläst.To support the insertion of the thread into the thread insertion slot, a compressed air nozzle directed into the thread insertion slot, which blows the thread into the thread insertion slot, can be assigned to both a stationary and a movable thread clamp.

Gemäss einer bevorzugten Ausbildung des Erfindungsgegenstandes mündet der Faserspeisekanal in den Keilspalt, während der Fadeneinlegeschlitz ausserhalb des Keilspaltes gegenüber der Umfangsfläche des sich in den Keilspalt hineindrehenden Friktionsspinnelementes mündet. Dabei ist zweckmässigerweise vorgesehen, dass das abzugsseitige Ende des Fadeneinlegeschlitzes einen grösseren Abstand von der Fadenbildungszone aufweist als das der Abzugsseite abgewandte Ende der Fadenbildungszone. Diese Ausbildung des Erfindungsgegenstandes stellt auf einfache Weise sicher, dass beim Zuführen des Fadens in die Fadenbiidungszone das freie Fadenende früher in die Fadenbildungszone gelangt als der Fadenzwischenabschnitt zwischen dem Fadenende und dem abzugsseitigen Ende des Keilspaltes. Es hat sich dabei als vorteilhaft erwiesen, wenn der Winkelabstand des abzugsseite Endes der auf der Innenseite der Abdeckung mündenden Mündung des Fadeneinlegeschlitzes von der Fadenbildungszone grösser als 90° ist.According to a preferred embodiment of the subject matter of the invention, the fiber feed channel opens into the wedge gap, while the thread insertion slot opens outside the wedge gap opposite the circumferential surface of the friction spinning element turning into the wedge gap. It is expediently provided that the end of the thread insertion slot on the take-off side is at a greater distance from the thread-forming zone than the end of the thread-forming zone facing away from the take-off side. This design of the subject matter of the invention ensures in a simple manner that when the thread is fed into the thread formation zone, the free thread end reaches the thread formation zone earlier than the intermediate thread section between the thread end and the take-off end of the wedge gap. It has proven to be advantageous if the angular distance between the end of the draw-off end of the mouth of the thread insertion slot opening on the inside of the cover and the thread formation zone is greater than 90 °.

Um eine möglichst gleichförmiges Zuführen des Fadens zum Keilspalt zu gewährleisten, ist zweckmässigerweise vorgesehen, dass der Fadeneinlegeschlitz mit der Drehrichtung des in den Keilspalt hineindrehenden Friktionsspinnelementes einen Neigungswinkel von weniger als 90° einschliesst.In order to ensure that the thread is fed to the wedge gap as uniformly as possible, it is expediently provided that the thread insertion slot includes an angle of inclination of less than 90 ° with the direction of rotation of the friction spinning element screwing into the wedge gap.

Ein rasches Einführen des Fadens in den Fadeneinlegeschlitz wird erfindungsgemäss dadurch erreicht, dass sich der Fadeneinlegeschlitz zur Aussenseite der Abdeckung hin erweitert. Hierdurch wird eine sichere Funktion auch bei grösseren Bewegungstoleranzen erreicht.A rapid insertion of the thread into the thread insertion slot is achieved according to the invention in that the thread insertion slot widens towards the outside of the cover. In this way, a reliable function is achieved even with larger movement tolerances.

Um den Luftverbrauch beim Spinnen niedrig zu halten, ist vorteilhafterweise vorgesehen, dass der Fadeneinlegeschlitz durch ein steuerbares Verschlussorgan abdeckbar ist. Der Fadeneinlegeschlitz wird nur für das Anspinnen freigegeben, während er anschliessend für den normalen Spinnvorgang wieder abgedeckt wird. Zweckmässigerweise ist vorgesehen, dass dieses Verschlussorgan im Zusammenhang mit den anderen Operationen des Anspinnvorganges von einer längs einer Vielzahl von Offenend-Friktionsspinnvorrichtung verfahrbaren Wartungswagen aus steuerbar ist.In order to keep the air consumption during spinning low, it is advantageously provided that the thread insertion slot can be covered by a controllable closure member. The thread insertion slot is only released for piecing, while it is then covered again for normal spinning. It is expediently provided that this closure member can be controlled in connection with the other operations of the piecing process from a maintenance carriage which can be moved along a plurality of open-end friction spinning devices.

Wie oben erwähnt, ist es vorteilhaft, wenn der Fadenabzug an die jeweiligen Spinnbedingungen angepasst werden kann, indem der Fadenabzug verzögert und/oder mit reduzierter Geschwindigkeit angetrieben werden kann. Um zusätzlich Beschädigungen der Friktionsspinnelemente zu vermeiden, sind gemäss einem weiteren Merkmal der Erfindung den Friktionsspinnelementen ein ihren Antrieb steuernder Fadenwächter und eine von einem längs einer Vielzahl von Offenend-Friktionsspinnvorrichtungen verfahrbarer Wartungswagen steuerbare Hilfsantriebsvorrichtung zugeordnet.As mentioned above, it is advantageous if the thread take-off can be adapted to the respective spinning conditions by the thread take-off being decelerated and / or being driven at a reduced speed. In order to additionally prevent damage to the friction spinning elements, according to a further feature of the invention, the thread spinning elements are assigned a thread monitor controlling their drive and an auxiliary drive device which can be controlled by a maintenance carriage which can be moved along a plurality of open-end friction spinning devices.

Obwohl der Faden dem Keilspalt quer zu dessen Längsrichtung zugeführt wird, bleiben die Friktionsspinnelemente gemäss der vorliegenden Erfindung während des gesamten Anspinnvorganges abgedeckt. Dies ermöglicht eine sehr individuelle und variable Steuerung des Anspinnvorganges, die sich in optimaler Weise an die jeweiligen Spinnparameter (Material, Garnstärke etc.) anpassen lässt. Hierdurch lassen sich sichere und kurze Ansetzer sowohl im Zusammenhang mit einer Fadenbruchbehebung als auch im Zusammenhang mit einem Spulenwechsel erzeugen. Trotz dieser optimierten Steuerung ist die erfindungsgemässe Vorrichtung einfach und platzsparend im Aufbau.Although the thread is fed to the wedge gap transversely to its longitudinal direction, the friction spinning elements according to the present invention remain covered during the entire piecing process. This enables a very individual and variable control of the piecing process, which can be optimally adapted to the respective spinning parameters (material, thread thickness, etc.). This enables safe and short piecing to be generated both in connection with thread breakage elimination and in connection with a bobbin change. Despite this optimized control, the device according to the invention is simple and space-saving in construction.

Nachstehend werden mehrere Ausführungsbeispiele des Erfindungsgegenstandes anhand von Zeichnungen näher erläutert. Es zeigen:

  • Figur 1 in schematischer Seitenansicht eine erfindungsgemäss ausgebildete Spinnstelle mit einer Offenend-Friktionsspinnvorrichtung und einer bewegbaren Fadenklemme;
  • Figur 2 in schematischer Seitenansicht eine erfindungsgemässe Friktionsspinnvorrichtung sowohl mit einer als Saugluftdüse als auch mit einer als Fadenklemme ausgebildeten Fadenhaltevorrichtung;
  • Figur 3 in perspektivischer Ansicht die in Figur 2 gezeigte Friktionsspinnvorrichtung;
  • Figur 4 eine Vorderansicht der in Figur 3 gezeigten Vorrichtung; und
  • Figur 5 in der Seitenansicht eine Abwandlung der in Figur 2 gezeigten Vorrichtung mit lediglich einer als Fadenklemme ausgebildeten Fadenhaltevorrichtung.
  • Fig. 1 zeigt eine Offenend-Friktionsspinnvorrichtung 10, der das Fasermaterial 3 mittels einer Zufuhr- und Auflöseeinrichtung 2 zugeführt wird. Zum Abziehen des gesponnenen Fadens 30 ist eine Abzugsvorrichtung 4 vorgesehen. Das abgezogene Garn wird mittels einer Spulvorrichtung 40 auf eine Spule 400 gewickelt, die durch eine Spulwalze antreibbar ist.
Several exemplary embodiments of the subject matter of the invention are explained in more detail below with reference to drawings. Show it:
  • FIG. 1 shows a schematic side view of a spinning station designed according to the invention with an open-end friction spinning device and a movable thread clamp;
  • FIG. 2 shows a schematic side view of a friction spinning device according to the invention with both a suction air nozzle and a thread holding device designed as a thread clamp;
  • Figure 3 is a perspective view of the friction spinning device shown in Figure 2;
  • Figure 4 is a front view of the device shown in Figure 3; and
  • 5 shows a side view of a modification of the device shown in FIG. 2 with only one thread holding device designed as a thread clamp.
  • 1 shows an open-end friction spinning device 10, to which the fiber material 3 is fed by means of a feed and dissolving device 2. A take-off device 4 is provided for pulling off the spun thread 30. The drawn-off yarn is wound by means of a winding device 40 onto a bobbin 400 which can be driven by a winding roller.

Die Offenend-Friktionsspinnvorrichtung 10 ist zusammen mit der Zufuhr- und Auflöseeinrichtung 2 stationär an der Spinnstelle 1 vorgesehen, von denen in einer Maschine üblicherweise eine Vielzahl nebeneinander angeordnet sind. Längs dieser Spinnstellen 1 ist ein Wartungswagen 5 mit einer Anspinnvorrichtung 50 verfahrbar.The open end friction spinning device 10 is together with the feed and dissolving device device 2 is provided stationary at the spinning station 1, of which a plurality are usually arranged side by side in a machine. A maintenance carriage 5 with a piecing device 50 can be moved along these spinning positions 1.

Die Offenend-Friktionsspinnvorrichtung 10 besitzt ein Gehäuse 13 mit zwei rotationssymmetrischen Friktionsspinnelementen 100 und 101 (Fig. 3), die einen Keilspalt 102 bilden. Zumindest eines der Friktionsspinnelemente, z. B. das Friktionsspinnelement 101, ist perforiert und während des Spinnens im Bereich des Keilspaltes 102 besaugt. Es ist hierzu über ein Ventil 110 an eine Saugluftleitung 11 angeschlossen (Fig. 1).The open-end friction spinning device 10 has a housing 13 with two rotationally symmetrical friction spinning elements 100 and 101 (FIG. 3), which form a wedge gap 102. At least one of the friction spinning elements, e.g. B. the friction spinning element 101 is perforated and sucked during spinning in the area of the wedge gap 102. For this purpose, it is connected to a suction air line 11 via a valve 110 (FIG. 1).

Die beiden Friktionsspinnelemente 100 und 101, die im gezeigten Ausführungsbeispiel der Walzen ausgebildet sind, werden gleichsinnig angetrieben (siehe Pfeile P7 in Fig. 3). Zu diesem Zweck besitzt jedes Friktionsspinnelement 100 und 101 einen Wirtel 103, an welchem ein Antriebsriemen 120 anliegt. Der Antriebsriemen 120 ist um zwei Rollen 121 - von denen in Fig. 1 nur eine sichtbar ist - so geschlungen, dass er stets in kraftschlüssiger Verbindung mit den Wirteln 103 der beiden Friktionsspinnelemente 100 und 101 steht. An der Aussenseite des Antriebsriemens 120 liegt eine Antriebsrolle 122 an, welche ihren Antrieb von einem Tangentialriemen 12 erhält, welchersich über eine vielzahl nebeneinander befindlicher Spinnstellen 1 erstreckt. Die Antriebsrolle 122 wird vom Anker 600 eines Hubmagneten 60 getragen, welcher von einer Steuereinheit 6 aus steuerbar ist, und ist somit in den Richtungen des Pfeiles 8 verstellbar.The two friction spinning elements 100 and 101, which are formed in the exemplary embodiment of the rollers shown, are driven in the same direction (see arrows P7 in FIG. 3). For this purpose, each friction spinning element 100 and 101 has a whorl 103, against which a drive belt 120 rests. The drive belt 120 is wrapped around two rollers 121 - only one of which is visible in FIG. 1 - in such a way that it is always in a non-positive connection with the whorls 103 of the two friction spinning elements 100 and 101. On the outside of the drive belt 120 there is a drive roller 122 which receives its drive from a tangential belt 12 which extends over a large number of spinning stations 1 located next to one another. The drive roller 122 is carried by the armature 600 of a lifting magnet 60, which can be controlled from a control unit 6, and is thus adjustable in the directions of the arrow 8.

Den Friktionsspinnelementen 100 und 101 ist eine Hilfsantriebsvorrichtung 54zustellbar, die auf dem Wartungswagen 5 angeordnet ist. Die Hilfsantriebsvorrichtung 54 besitzt eine steuerbare Antriebsrolle 540, welche über ein (angedeutetes) Getriebe 541 von einem Motor 542 aus angetrieben wird. Die Antriebsrolle 540 sitzt am Ende einer in Längsrichtung (Pfeil Pl ) verschiebbaren Stange 543.An auxiliary drive device 54, which is arranged on the maintenance carriage 5, can be delivered to the friction spinning elements 100 and 101. The auxiliary drive device 54 has a controllable drive roller 540 which is driven by a motor 542 via a (indicated) gear 541. The drive roller 540 is seated at the end of a rod 543 which can be displaced in the longitudinal direction (arrow P1).

Damit die Stange 543 bei dieser Längsbewegung frei bewegt werden kann, ist die Stange darüber hinaus um eine horizontale Achse 544 in vertikaler Richtung verschwenkbar (Pfeil P2). Die Achse 544 ist auf einem Lagerblock 55 gelagert, der seinerseits um eine vertikale Achse 51 drehbar ist (Pfeil P3), um somit die Hilfsantriebsvorrichtung 54 aus dem Bereich der Spinnstelle 1 bis in den Bereich des Wartungswagens 5 zurückbringen zu können.So that the rod 543 can be freely moved during this longitudinal movement, the rod can also be pivoted in the vertical direction about a horizontal axis 544 (arrow P2). The axis 544 is mounted on a bearing block 55, which in turn can be rotated about a vertical axis 51 (arrow P3) in order to be able to bring the auxiliary drive device 54 back from the area of the spinning station 1 into the area of the maintenance carriage 5.

Die der Offenend-Friktionsspinnvorrichtung 10 vorgeordnete Zuführ- und Auflösevorrichtung 2 besitzt einen Zuführtrichter 20, mittels welchem das bandförmige Fasermaterial 3 einer Speisewalze 21 zugeführt wird, mit welcher in üblicher Weise eine Druckwalze oder Speisemulde (nicht gezeigt) zusammenarbeitet. Von der Speisewalze 21 wird das Fasermaterial 3 einer Aufiösewaize 22 zugeführt, die das bandförmige Fasermaterial zu Einzelfasern auflöst. Die Auflösewalze 22 wird in bekannter Weise durch einen Riemen 23 angetrieben. Von der Auflösewalze 22 erstreckt sich ein Faserspeisekanal 24 bis in den Keilspalt 102 der Friktionsspinnelemente 100, 101.The feed and dissolving device 2 arranged upstream of the open-end friction spinning device 10 has a feed hopper 20, by means of which the band-shaped fiber material 3 is fed to a feed roller 21, with which a pressure roller or feed trough (not shown) cooperates in the usual way. The fiber material 3 is fed from the feed roller 21 to a dissolving roller 22 which dissolves the band-shaped fiber material into individual fibers. The opening roller 22 is driven in a known manner by a belt 23. A fiber feed channel 24 extends from the opening roller 22 into the wedge gap 102 of the friction spinning elements 100, 101.

Der von der Offenend-Friktionsspinnvorrichtung 10 mittels der Abzugsvorrichtung 4 abgezogene Faden 30 wird auf seinem Weg zu der durch eine Spulwalze 401 angetriebenen Spule 400 durch einen Fadenwächter 61 überwacht, der mit der Steuereinheit 6 in steuermässiger Verbindung steht.The thread 30 drawn off by the open-end friction spinning device 10 by means of the draw-off device 4 is monitored on its way to the bobbin 400 driven by a winding roller 401 by a thread monitor 61, which is in control connection with the control unit 6.

Die auf dem Wartungswagen 5 angeordnete Anspinnvorrichtung 50 besitzt ein gegen die Spule 400 schwenkbares Saugrohr 500 (Pfeil P4), mittels welchem von der Spule 400 ein Fadenende angesaugt werden kann. Die Spule 400 kann in bekannter Weise vom Wartungswagen 5 aus in Abspulrichtung angetrieben werden, so dass das angesaugte Fadenende immer weiter in das Saugrohr 500 hineingelangt. Das Saugrohr 500 besitzt auf seiner der Spinnstelle 1 zugewandten Seite einen (nicht gezeigten) Längsschlitz, damit der angesaugte Fadenabschnitt zwischen dem der Spule 400 abgewandten Schlitzende in Nähe der Schwenkachse 501 des Saugrohres 500 und der Spule 400 einen gestreckten Verlauf einnehmen kann. Dabei gelangt der Faden 30 in den Schwenkbereich einer steuerbaren Fadenklemme 70. Die Fadenklemme 70 ist Teil einer Fadenhaltevorrichtung 7 und ist auf dem freien Ende eines Armes 700 angeordnet, welcher auf dem Wartungswagen 5 so gelagert ist, dass er um die Schwenkachse 51 eine erste Schwenkbewegung in einer horizontalen Ebene (Pfeil P3) und um eine Schwenkachse 701 eine zweite Schwenkbewegung in einer vertikalen Ebene (Pfeil P5) ausführen kann. Der Arm 700 trägt ferner eine steuerbare Druckluftdüse 702.The piecing device 50 arranged on the maintenance carriage 5 has a suction tube 500 (arrow P4) which can be pivoted against the bobbin 400 and by means of which a thread end can be sucked in from the bobbin 400. The bobbin 400 can be driven in a known manner from the maintenance carriage 5 in the unwinding direction, so that the thread end that is sucked in continues to get into the suction pipe 500. The suction tube 500 has a longitudinal slot (not shown) on its side facing the spinning station 1, so that the thread section sucked in between the slot end facing away from the spool 400 in the vicinity of the pivot axis 501 of the suction tube 500 and the spool 400 can take an elongated course. In this case, the thread 30 comes into the swivel range of a controllable thread clamp 70. The thread clamp 70 is part of a thread holding device 7 and is arranged on the free end of an arm 700 which is mounted on the maintenance carriage 5 in such a way that it makes a first pivoting movement about the pivot axis 51 in a horizontal plane (arrow P3) and about a pivot axis 701 can perform a second pivoting movement in a vertical plane (arrow P5). Arm 700 also carries a controllable compressed air nozzle 702.

Der Fadenklemme 70 ist ein schwenkbares Saugrohr 52 zugeordnet, das auf einer horizontalen Achse 520 schwenkbar gelagert ist, so dass esvon einer Aufnahmestellung in Nähe der Fadenklemme 70 in eine Übergangsstellung in Nähe der Spule 400 in einer vertikalen Schwenkebene (Pfeil P6) verschwenkt werden kann. Das Saugrohr 52 steht über eine Saugleitung 521 mit einer Unterdruckquelle (nicht gezeigt) in Verbindung.The thread clamp 70 is assigned a pivotable suction tube 52 which is pivotably mounted on a horizontal axis 520, so that it can be pivoted from a receiving position in the vicinity of the thread clamp 70 into a transition position in the vicinity of the bobbin 400 in a vertical pivot plane (arrow P6). The suction pipe 52 is connected via a suction line 521 to a vacuum source (not shown).

Fig. 4 zeigt das Gehäuse 13 in der Draufsicht, während Fig. 5 das Gehäuse 13 in der Seitenansicht zeigt. Hieraus ist ersichtlich, dass das Gehäuse 13 in seiner der Fadenklemme 70 zugewandten Abdeckung 130 einen Fadeneinlegeschlitz 14 aufweist. Dieser Fadeneinlegeschlitz 14 reicht von der Aussenseite 131 der Abdeckung 130 bis zu deren Innenseite 132 und verläuft neben dem Faserspeisekanal 24 vom abzugsseitigen Ende 133 des Gehäuses 13 bis zu dem der Abzugsseite abgewandten Mündungsende 240 des Faserspeisekanals 24 (Fig. 3). Da der Fadeneinlegeschlitz 14 neben dem Faserspeisekanal 24 angeordnet ist, mündet er neben dem Faserspeisekanal 24 und somit ausserhalb des Keilspaltes 1 02 gegenüber vom Friktionsspinnelement 101 im Inneren des Gehäuses 13.FIG. 4 shows the housing 13 in a top view, while FIG. 5 shows the housing 13 in a side view. It can be seen from this that the housing 13 has a thread insertion slot 14 in its cover 130 facing the thread clamp 70. This thread insertion slot 14 extends from the outer side 131 of the cover 130 to the inner side 132 and runs next to the fiber feed channel 24 from the take-off end 133 of the housing 13 to the mouth end 240 of the fiber feed channel 24 facing away from the take-off side (FIG. 3). Since the thread insertion slot 14 is arranged next to the fiber feed channel 24, it opens next to the fiber feed channel 24 and thus outside of the wedge gap 1 02 opposite the friction spinning element 101 in the interior of the housing 13.

Die zuvor im Aufbau beschriebene Vorrichtung arbeitet wie folgt:The device described above in construction works as follows:

Zum Anspinnen fährt der Wartungswagen 5 an die betreffende Spinnstelle 1. Dies kann aufgrund eines Signals geschehen, den der Fadenwächter 61 bei Auftreten eines Fadenbruches auslöst, oder aber beim Anspinnen nach einem Maschinenstillstand, bei welchem der Wartungswagen 5 Spinnstelle 1 auf Spinnstelle 1 anspinnt. An der Spinnstelle 1 wird das Saugrohr 500 um seine Schwenkachse 501 gegen die zu einem früheren Zeitpunkt bereits von der Spulwalze 401 abgehobene Spule 400 geschwenkt. Während die Spule 400 vom Wartungswagen 5 aus mittels einer nicht gezeigten Hilfsantriebsrolle in Abwickelrichtung angetrieben wird, nimmt das Saugrohr 500 den abgespulten Faden 30 auf. Ist eine ausreichende Fadenlänge in das Saugrohr 500 gesaugt worden, so wird die Spule 400 stillgesetzt und das Saugrohr 500 von der Spule 400 weggeschwenkt. Dabei tritt der Faden 30 aus dem zuvor erwähnten Längsschlitz des Saugrohres 500 aus. Er nimmt dabei eine gestreckte Lage zwischen dem der Schwenkachse 501 zugewandten Ende des Längsschlitzes und der Spule 400 ein. Damit befindet sich der Faden 30 im Schwenkbereich der Fadenklemme 70. Die horizontal und vertikal verschwenkbare Fadenklemme 70 wird in den Fadenlauf in eine Fadenaufnahmestellung gebracht, wo sie den Faden 30 aufnimmt. Sie führt den Faden 30 einer im Wartungswagen 5 vorgesehenen Trennvorrichtung 53 (Fig. 1) zu, die den Faden 30 auf der der Spule 400 abgewandten Seite der Fadenklemme 70 durchtrennt. Dabei wird eine bestimmte Fadenlänge von der Fadenklemme 70 bis zum Ende des Fadens 30 geschaffen, die zum Anspinnen erforderlich ist. Die Fadenklemme 70 wird sodann in einer kombinierten Horizontal- und Vertikalbewegung zur Offenend-Friktionsspinnvorrichtung 10 geschwenkt. Die Fadenklemme 70 befindet sich dabei in einer Fadenübergabestellung vor dem Fadeneinlegeschlitz 14 (Fig. 5); die Fadenklemme 70 bildet somit eine Fadenhaltevorrichtung 7, die das Fadenende 300 dem Fadeneinlegeschlitz 14 präsentiert. Dabei hält die durch die Fadenklemme 70 gebildete Fadenhaltevorrichtung 7 den Faden 30 im wesentlichen parallel zum Fadeneinlegeschlitz 14.The maintenance carriage 5 travels to the relevant spinning station 1 for piecing of a signal that the thread monitor 61 triggers when a thread break occurs, or when spinning after a machine standstill, in which the maintenance carriage 5 spins spinning station 1 onto spinning station 1. At the spinning station 1, the suction tube 500 is pivoted about its pivot axis 501 against the spool 400 that was already lifted off the winding roller 401 at an earlier point in time. While the bobbin 400 is driven from the maintenance carriage 5 by means of an auxiliary drive roller (not shown) in the unwinding direction, the suction pipe 500 takes up the unwound thread 30. If a sufficient length of thread has been sucked into the suction tube 500, the bobbin 400 is stopped and the suction tube 500 is pivoted away from the bobbin 400. The thread 30 emerges from the aforementioned longitudinal slot of the suction pipe 500. It assumes an extended position between the end of the longitudinal slot facing the pivot axis 501 and the coil 400. The thread 30 is thus in the pivoting range of the thread clamp 70. The horizontally and vertically pivotable thread clamp 70 is brought into the thread run into a thread take-up position, where it picks up the thread 30. It feeds the thread 30 to a separating device 53 (FIG. 1) provided in the maintenance carriage 5, which cuts the thread 30 on the side of the thread clamp 70 facing away from the bobbin 400. A certain thread length is created from the thread clamp 70 to the end of the thread 30, which is necessary for piecing. The thread clamp 70 is then pivoted in a combined horizontal and vertical movement to the open-end friction spinning device 10. The thread clamp 70 is in a thread transfer position in front of the thread insertion slot 14 (FIG. 5); the thread clamp 70 thus forms a thread holding device 7, which presents the thread end 300 to the thread insertion slot 14. The thread holding device 7 formed by the thread clamp 70 holds the thread 30 essentially parallel to the thread insertion slot 14.

Während dieser Rücklieferung des Fadens 30 in seine Anspinnstellung vor dem Fadeneinlegeschlitz 14 werden die Friktionsspinnelemente 100 und 101, die durch Abheben der Antriebsrolle 122 vom Antriebsriemen 120 zuvor stillgesetzt waren, wieder in Drehung versetzt. Hierzu wird die Antriebsrolle 540 vom Wartungswagen 5 aus zur Anlage an den Antriebsriemen 120 gebracht. Die Friktionsspinnelemente 100, 101 erhalten nun ihren Antrieb vom Motor 542 aus über die Antriebsrolle 540 und den Antriebsriemen 120. Dieser Antrieb ist vom maschineneigenen Antrieb (Tangentialriemen 12) völlig unabhängig, so dass die Friktionsspinnelemente 100,101 mit einer für das Anspinnen besonders vorteilhaften niedrigen Geschwindigkeit angetrieben werden können.During this return delivery of the thread 30 into its piecing position in front of the thread insertion slot 14, the friction spinning elements 100 and 101, which were previously stopped by lifting the drive roller 122 from the drive belt 120, are rotated again. For this purpose, the drive roller 540 is brought into contact with the drive belt 120 from the maintenance carriage 5. The friction spinning elements 100, 101 now receive their drive from the motor 542 via the drive roller 540 and the drive belt 120. This drive is completely independent of the machine's drive (tangential belt 12), so that the friction spinning elements 100, 101 are driven at a low speed which is particularly advantageous for piecing can be.

An die Friktionsspinnwalzen 100, 101 wird nun auch der zuvor abgeschaltete Unterdruck mit Hilfe des Ventils 110 erneut angelegt. Nun wird auch die Faserzuführung in bekannter Weise wieder eingeschaltet. Das Faserband gelangt nun in Form von Einzelfasern in den Keilspalt 102 und wird dort innerhalb einer Fadenbildungszone 104 zu einem Faserbündel 31 zusammengedreht (Fig. 5). Eine echte Drehung erhält dieses Faserbündel 31 dabei jedoch nicht, da es sich frei im Keilspalt 102 drehen kann.The previously switched off vacuum is now again applied to the friction spinning rollers 100, 101 with the help of the valve 110. Now the fiber feed is switched on again in a known manner. The sliver now arrives in the form of individual fibers in the wedge gap 102 and is twisted there into a fiber bundle 31 within a thread formation zone 104 (FIG. 5). However, this fiber bundle 31 does not get a real rotation since it can rotate freely in the wedge gap 102.

Zeitlich abgestimmt auf das Wiedereinschalten der Faserzufuhr in den Keilspalt 102 wird die Druckluft in der Druckluftdüse 702 freigegeben, so dass das Fadenende 300 in den Fadeneinlegeschlitz 14 geblasen wird (Fig. 5). Diese Druckluft unterstützt somit die das besaugte Friktionsspinnelement 101 durchfliessende Saugluftströmung. Das Fadenende 300 gelangt somit ausserhalb des Keilspaltes 102 auf die besaugte Mantelfläche des Friktionsspinnelementes 101. Aufgrund des an der Mantelfläche wirksamen Unterdruckes wird das Fadenende 300 durch das in den Keilspalt 102 drehende Friktionsspinnelement 101 mitgenommen und auf das sich drehende Faserbündel 31 aufgelegt. Das Faserbündel 31, das einen noch relativ lockeren Faserverband bildet, wird nun in das Fadenende 300 eingedreht.The compressed air in the compressed air nozzle 702 is released in time with the re-switching of the fiber feed into the wedge gap 102, so that the thread end 300 is blown into the thread insertion slot 14 (FIG. 5). This compressed air thus supports the suction air flow flowing through the suctioned friction spinning element 101. The thread end 300 thus reaches outside of the wedge gap 102 on the suctioned outer surface of the friction spinning element 101. Due to the negative pressure acting on the outer surface, the thread end 300 is carried along by the friction spinning element 101 rotating in the wedge gap 102 and placed on the rotating fiber bundle 31. The fiber bundle 31, which forms a still relatively loose fiber structure, is now screwed into the thread end 300.

Aus dem Vorstehenden ergibt sich, dass das Fadenende 300 nicht vor Erreichen des Keilspaltes 102 mit den Fasern in Kontakt gelangt, sondern dass diese Kontaktaufnahme gleichzeitig mit dem Erreichen des Keilspaltes 102 und damit der Fadenbildungszone 104 erfolgt. Hierdurch wird ein sauberes Einbinden der Fasern in das Fadenende 300 erzielt. Durch Steuerung der Drehzahl der Friktionsspinnelemente 100, 101 - d. h. Antrieb derselben mit reduzierter Geschwindigkeit-während der Anspinnphase kann eine grössere Zeitspanne bis zum Einsetzen des Fadenabzuges vorgesehen werden, was die Anspinnsicherheit erhöht.It follows from the above that the thread end 300 does not come into contact with the fibers before the wedge gap 102 is reached, but that this contact is made simultaneously with the wedge gap 102 and thus the thread formation zone 104 being reached. In this way, a clean integration of the fibers into the thread end 300 is achieved. By controlling the speed of the friction spinning elements 100, 101 - d. H. Driving them at a reduced speed - during the piecing phase, a longer period of time can be provided until the thread take-off is inserted, which increases the piecing reliability.

Wie Fig. 5 deutlich zeigt, gelangt lediglich das der Abzugsseite abgewandte Ende des Fadenendes 300 in den Keilspalt 102, während das abzugsseitige Ende des Fadenendes 300 durch die Fadenklemme 70 daran gehindert wird, dass es durch den Fadeneinlegeschlitz 14 hindurch in den Keilspalt 102 gelangt. Somit ist der mit den vorgespeisten Fasern in Berührung kommende Fadenbereich nur kurz und in der Regel sogar kürzer als die Fadenbildungszone 104. Dies führt zu kurzen Ansetzern und somit auch zu kurzen Fehlstellen im neu angesponnenen Faden. Durch relative Steuerung von Faserspeisung, Fadenzuführung, Drehzahl der Friktionsspinnelemente 100,101 und Einsetzen des Fadenabzuges wird die erforderliche Festigkeit des Ansetzers erzielt. Auf diese Weise kann auch eine auf die Ansetzstelle im Faden folgende Dünnstelle vermieden werden.As FIG. 5 clearly shows, only the end of the thread end 300 facing away from the take-off side reaches the wedge gap 102, while the take-off end of the thread end 300 is prevented by the thread clamp 70 from entering the wedge gap 102 through the thread insertion slot 14. Thus, the thread area coming into contact with the pre-fed fibers is only short and, as a rule, even shorter than the thread formation zone 104. This leads to short piecing and thus to short defects in the newly spun thread. The required strength of the piecer is achieved by relative control of fiber feed, thread feed, speed of the friction spinning elements 100, 101 and insertion of the thread take-off. In this way, a thin spot following the attachment point in the thread can also be avoided.

Das Abziehen des sich nun wieder bildenden Fadens 30 von der Fadenbildungszone 104 erfolgt durch Fortsetzen der Bewegung des Armes 700 mit der Fadenklemme 70, wobei dies je nach Anspinngeschwindigkeit, Fasermaterial etc. nach Unterbrechen der Zuführ- und Vorlegebewegung der Fadenhaltevorrichtung 7 oder auch in kontinuierlicher Fortsetzung dieser Zuführ- und Vorlegebewegung geschehen kann.The thread 30 which is now forming again is pulled off from the thread formation zone 104 by continuing the movement of the arm 700 with the thread clamp 70, this depending on the piecing speed, fiber material etc. after interrupting the feed and feed movement of the thread holding device 7 or in a continuous manner this feed and feed movement can happen.

Die Fadenhaltevorrichtung 7 bildet zugleich eine Fadenführung 75 für den Faden 30 und verhindert - wie erwähnt - dass das abzugsseitige Ende des Fadenendes 300 in den Keilspalt 102 gelangt. Bei grösser werdender Entfernung zwischen dieser eine Fadenführung 75 bildenden Fadenhaltevorrichtung 7 jedoch erhält der sich neu bildende Faden 30 die Möglichkeit, sich über die volle Länge der Fadenbildungszone 104 in den Keilspalt 102 zu legen, obwohl der Faden 30 beim Anspinnen die Fadenbildungszone zunächst lediglich mit seinem freien Ende erreicht.The thread holding device 7 forms at the same time a thread guide 75 for the thread 30 and, as mentioned, prevents the end of the thread end 300 on the take-off side from getting into the wedge gap 102. As the distance between this thread holding device 7, which forms a thread guide 75, increases, however, the newly forming thread 30 is given the opportunity to lie in the wedge gap 102 over the full length of the thread forming zone 104, although the thread 30 initially spins the thread forming zone only with its free end reached.

Zeitlich abgestimmt auf die geschilderten Vorgänge wird auch die Spule 400 wieder auf die Spulwalze 401 abgesenkt. Die Spule 400 beginnt somit, sich in Abzugsrichtung zu drehen und den Faden 30 von der Offenend-Friktionsspinnvorrichtung 10 abzuziehen. Die Fadenklemme 70 wird jetzt geöffnet. Spannungsschwankungen, die durch Schlupf der in der Beschleunigung begriffenen Spule 400 auftreten, werden von dem im Saugrohr 52 wirkenden Saugluftstrom aufgefangen. Das Saugrohr 52 speichert die überschüssige Fadenlänge, bis sie durch den Anspannungsverzug beim Aufwinden wieder aufgebraucht ist.The spool 400 is also lowered back onto the spooling roller 401 in a time-coordinated manner with respect to the processes described. The bobbin 400 thus begins to rotate in the take-off direction and pull the thread 30 from the open-end friction spinning device 10. The thread clamp 70 is now opened. Voltage fluctuations that occur due to slipping of the coil 400 which is accelerating are absorbed by the suction air flow acting in the suction pipe 52. The suction pipe 52 stores the excess thread length until it is used up again by the tension delay when it winds up.

Durch das Einsetzen des Fadenabzuges mittels der Spule 400 gelangt der Faden 30 aufgrund der zunehmenden Fadenspannung, evtl. unterstützt durch geeignete Fadenleitelemente (nicht gezeigt), in die Klemmlinie der Abzugsvorrichtung 4. Gleichzeitig mit dem Absenken der Spule 400 wird auch über den Hubmagneten 60 das erneute Wiederauflegen der Antriebsrolle 122 an den Antriebsriemen 120 bewirkt, während zur selben Zeit die Antriebsrolle 540 der Hilfsantriebsvorrichtung 54 den Antriebsriemen 120 wieder freigibt. Der Antrieb der Friktionsspinnelemente 100 und 101 erfolgt somit wieder durch den Tangentialriemen 12 der Maschine.By inserting the thread take-off by means of the spool 400, the thread 30 gets into the clamping line of the take-off device 4 due to the increasing thread tension, possibly supported by suitable thread guide elements (not shown). Simultaneously with the lowering of the spool 400, this is also done via the lifting magnet 60 repositioning the drive roller 122 on the drive belt 120, while at the same time the drive roller 540 of the auxiliary drive device 54 releases the drive belt 120 again. The friction spinning elements 100 and 101 are thus driven again by the tangential belt 12 of the machine.

Die anhand der Fig. 1 beschriebene Vorrichtung lässt sich auch im Zusammenhang mit einem Spulenwechsel zur Anwendung bringen. Dabei kann das Anspinnen mit Hilfe von Hilfswindungen auf der Leerhülse erfolgen, so dass das Ansetzen in der beschriebenen Weise erfolgt. Der Ansetzer und der verbleibende Rest der Hilfswindungen können auch vorübergehend abgesaugt werden mit Hilfe des Saugrohres 52, woraufhin der neu gesponnene Faden 30 mit diesem Saugrohr 52 an die Leerhülse übergeben wird, was in an sich bekannter Weise mit Hilfe einer (nicht gezeigten) Fangnase etc. der Spulvorrichtung 40 unterstützt werden kann.The device described with reference to FIG. 1 can also be used in connection with a coil change. The piecing can take place with the aid of auxiliary turns on the empty tube, so that the attachment takes place in the manner described. The piecing and the remaining rest of the auxiliary windings can also be temporarily sucked off with the help of the suction tube 52, whereupon the newly spun thread 30 is transferred with this suction tube 52 to the empty tube, which can be done in a manner known per se with the aid of a catch nose (not shown) etc the winding device 40 can be supported.

Ein Spulenwechsel ist jedoch auch ohne Hilfswindungen auf der Leerhülse möglich. Zu diesem Zweck sitzt gemäss Fig. 1 auf dem Wartungswagen 5 eine Hilfsspule 32, von welcher der Anspinnfaden 320 durch die Fadenklemme 70 abgezogen werden kann. Der Anspinnfaden 320 wird von der Hilfsspule 32 über eine Fadenführung 321 und eine Fadenklemme 322 geführt bis in den Bereich, wo der Anspinnfaden 320 von der Fadenklemme 70 erfasst werden kann. Der Anspinnfaden 320 wird von der Fadenklemme 70 durch die Trennvorrichtung 53 geführt, wo der Anspinnfaden 320 die exakte Anspinnlänge erhält.However, changing the bobbin is also possible without auxiliary turns on the empty tube. For this purpose, as shown in FIG. 1, an auxiliary spool 32 is seated on the maintenance carriage 5, from which the piecing thread 320 can be pulled off by the thread clamp 70. The piecing thread 320 is guided by the auxiliary bobbin 32 via a thread guide 321 and a thread clamp 322 to the area where the piecing thread 320 can be gripped by the thread clamp 70. The piecing thread 320 is guided by the thread clamp 70 through the separating device 53, where the piecing thread 320 receives the exact piecing length.

Das Anspinnen erfolgt wie beschrieben. Die Fadenklemme 70 wird beim Anspinnabzug in Richtung Spulvorrichtung 40 bewegt bis in den Bereich der Mündung 522 des Saugrohres 52. Die Fadenklemme 70 wird nun derart gesteuert, dass sie den Faden 30 freigibt, der nun in das Saugrohr 52 gesaugt wird.The piecing takes place as described. The thread clamp 70 is moved during the piecing draw-off in the direction of the winding device 40 up to the area of the mouth 522 of the suction tube 52. The thread clamp 70 is now controlled in such a way that it releases the thread 30, which is now sucked into the suction tube 52.

Jetzt wird das Saugrohr 52 zur Spulvorrichtung 40 verschwenkt, wo der Faden 30 an die Leerhülse übergeben wird. Bei der Aufnahme des Fadens 30 durch die Spulvorrichtung 40 wird eine gewisse Fadenlänge aus dem Saugrohr 52 herausgezogen. In Nähe der Mündung 522 des Saugrohres 52 befindet sich eine Schneidevorrichtung 523, die nach Übergabe des Fadens 30 an die Leerhülse das sich in das Saugrohr 52 erstreckende Fadenende abtrennt. Auf diese Weise ist beim Spulenwechsel der Faden 30, welcher zuvor durch die in Abzugsrichtung bewegliche Fadenklemme dem eine Speicherstelle bildenden Saugrohr 52 zugeführt worden ist, an eine neu eingelegte Leerhülse in der Spulvorrichtung 40 übergeben worden.Now the suction tube 52 is pivoted to the winding device 40, where the thread 30 is transferred to the empty tube. When the thread 30 is picked up by the winding device 40, a certain length of thread is pulled out of the suction tube 52. In the vicinity of the mouth 522 of the suction tube 52 there is a cutting device 523 which, after the thread 30 has been transferred to the empty tube, cuts off the thread end extending into the suction tube 52. In this way, when changing the bobbin, the thread 30, which was previously fed to the suction tube 52 forming a storage location by the thread clamp movable in the draw-off direction, was transferred to a newly inserted empty tube in the winding device 40.

Oben wurde beschrieben, dass die Zuführung von Fasern in den Keilspalt einsetzt, bevor das Fadenende 300 die Fadenbildungszone 104 erreicht hat, doch ist es je nach Anspinngeschwindigkeit, Fasermaterial etc. auch möglich, die Faserführung so zu steuern, dass die Fasern gleichzeitig mit dem Fadenende 300 den Keilspalt 102 erreichen. Das Fadenende 300 ist somit stets während der ganzen Zeit, während der es sich im Keilspalt 102 befindet, unter dem Einfluss von sich auf das Fadenende 300 auflegenden Fasern und wird auf diese Weise daran gehindert, durch die ansteigende Drehung im Faden 30 zusammenzuspringen.It was described above that the supply of fibers starts in the wedge gap before the thread end 300 has reached the thread formation zone 104, but it is also possible, depending on the piecing speed, fiber material etc., to control the fiber guidance in such a way that the fibers coincide with the thread end 300 reach the wedge gap 102. The thread end 300 is therefore always under the influence of fibers laying on the thread end 300 during the entire time it is in the wedge gap 102 and is thus prevented from jumping together by the increasing rotation in the thread 30.

Um sichere Ansetzer zu erhalten, wird in alternativer Ausgestaltung des geschilderten Anspinnverfahrens dafür gesorgt, dass die Mantelflächen der Friktionsspinnelemente 100 und 101 von Restfasern befreit werden. Zu diesem Zweck werden den stillgesetzten, jedoch besaugten Friktionsspinnelementen 100 und 101, noch bevor das Fadenende 300 vor den Fadeneinlegeschlitz 14 gelangt, kurzzeitig Fasern zugeführt. Sodann werden die Faserspeisung und die Besaugung der Friktionsspinnelemente 100 und 101 eingestellt. Die Fasern werden sodann aus dem Keilspalt 102 abgesaugt. Dies kann beispielsweise dadurch geschehen, dass die Abdeckung 103 vom restlichen Gehäuse 13 mit den Friktionsspinnelementen 100 und 101 weggeklappt und statt dessen vom Wartungswagen 5 aus eine nicht gezeigte, steuerbare Saugglocke vor die Friktionsspinnelemente 100, 101 gebracht wird. Es kann alternativ aber auch vorgesehen werden, dass die beiden Friktionsspinnelemente 100,101 in an sich bekannter Weise gespreizt werden, so dass die Fasern mittels einer nicht gezeigten Saugvorrichtung abgesaugt werden können, die auf der dem Faserspeisekanal 24 abgewandten Seite der Friktionsspinnelemente 100 und 101 angeordnet ist. Durch die vorübergehende Faserzufuhrwird eine Erhöhung der im Keilspalt 102 verbleibenden Faser-Restmasse erzielt, so dass ein Absaugen der Fasern erleichtert wird. Dieses Reinigen der Friktionsspinnelemente 100 und 101 bewirkt, dass unabhängig von den fadenbruchbedingten Restfasern im Keilspalt stets gleiche Anspinnverhältnisse erzielt werden. In zeitlich auf das vorangegangene Unterbrechen der Faserzufuhr abgestimmter Weise erfolgt dann die Anspinn-Faserzufuhr, so dass auch der Faserbart für das Anspinnen stets im gleichen Zustand ist. Entsprechend des Zeitpunktes für die Anspinn-Faserzufuhr ist somit das Einfü hren des Fadenendes 300 in den Fadeneinlegeschlitz 14 zu wählen.In order to obtain secure piecing, an alternative embodiment of the piecing process described ensures that the outer surfaces of the friction spinning elements 100 and 101 are freed of residual fibers. For this purpose, fibers are briefly fed to the stopped but suctioned friction spinning elements 100 and 101, even before the thread end 300 reaches the thread insertion slot 14. The fiber feed and the suction of the friction spinning elements 100 and 101 are then set. The fibers are then sucked out of the wedge gap 102. This can be done, for example, by folding the cover 103 away from the rest of the housing 13 with the friction spinning elements 100 and 101 and instead bringing a controllable suction bell (not shown) in front of the friction spinning elements 100, 101 from the maintenance carriage 5. Alternatively, it can also be provided that the two friction spinning elements 100, 101 are spread in a manner known per se, so that the fibers can be sucked off by means of a suction device, not shown, which is arranged on the side of the friction spinning elements 100 and 101 facing away from the fiber feed channel 24. The temporary fiber feed results in an increase in the remaining fiber mass in the wedge gap 102, so that suctioning off the fibers is facilitated. This cleaning of the friction spin elements 100 and 101 has the effect that the same piecing conditions are always achieved in the wedge gap regardless of the thread breakage-related residual fibers. The piecing fiber is then fed in a manner that is timed to the previous interruption of the fiber feed, so that the fiber beard for piecing is always in the same state. The insertion of the thread end 300 into the thread insertion slot 14 should therefore be selected in accordance with the time for the piecing fiber feed.

Bei Auftreten eines Fadenbruches ist es unvermeidbar, dass eine mehr oder weniger grosse Restfasermenge im Keilspalt 102 der Friktionsspinnelemente 100, 101 verbleibt. Wenn sich die Friktionsspinnelemente 100, 101 drehen, ohne dass diese Fasermasse einem Abzug unterworfen ist, kann es vorkommen, dass diese Fasermasse sich an den Friktionsspinnelementen 100, 101 festsetzt und mehrmals durch die Klemmstelle der Friktionsspinnelemente 100, 101 hindurchläuft. Dies führt mit der Zeit zu einer Beschädigung der Friktionsspinnelemente 100, 101. Um dieser Gefahr vorzubeugen, kann alternativ so verfahren werden, dass bei Auftreten eines Fadenbruches nicht nur die Faserzufuhr in den Keilspalt 102 unterbrochen wird, sondern dass darüber hinaus die Friktionsspinnelemente 100, 101 sofort stillgesetzt werden. Aufgrund des vom Fadenwächter 61 abgegebenen Fadenbruchsignales bewirkt die Steuereinheit 6 über den Hubmagneten 60, dass die vom Tangentialriemen 12 angetriebene Antriebsrolle 122 vom Antriebsriemen 120 getrennt werden, wodurch dieser stehenbleibt. Der beim Anspinnen erforderliche Wiederantrieb der Friktionsspinnelemente 100 und 101 erfolgt dann vom Wartungswagen 5 aus über die Hilfsantriebsvorrichtung 54. Das Einschalten der Faserspeisung und die Zufuhr des Fadenendes 300 in den Keilspalt erfolgen in der beschriebenen Weise.If a thread break occurs, it is inevitable that a more or less large amount of remaining fiber remains in the wedge gap 102 of the friction spinning elements 100, 101. If the friction spinning elements 100, 101 rotate without this fiber mass being subjected to a deduction, it can happen that this fiber mass attaches to the friction spinning elements 100, 101 and runs through the clamping point of the friction spinning elements 100, 101 several times. Over time, this leads to damage to the friction spinning elements 100, 101. In order to prevent this danger, one can alternatively proceed in such a way that if a thread break occurs, not only is the fiber supply to the wedge gap 102 interrupted, but also the friction spinning elements 100, 101 be stopped immediately. On the basis of the thread break signal emitted by the thread monitor 61, the control unit 6, via the lifting magnet 60, causes the drive roller 122 driven by the tangential belt 12 to be separated from the drive belt 120, as a result of which the latter stops. The re-driving of the friction spinning elements 100 and 101 required during piecing then takes place from the maintenance carriage 5 via the auxiliary drive device 54. The fiber feeding is switched on and the thread end 300 is fed into the wedge gap in the manner described.

Zum leichteren Einführen des Fadenendes 300 in den Fadeneinlegeschlitz 14 erweitert sich dieser gemäss Fig. 3 zur Aussenseite 131 der Abdeckung 130 hin keilförmig. Um das Fadenende 300 der Fadenbildungszone in beruhigtem Zustand zuführen zu können, beträgt der geringste Winkelabstand β zwischen dem Fadeneinlegeschlitz 14 und der Fadenbildungszone 104 mindestens 90°. Gemäss Fig. 3 ist dieser Winkelabstand β zwischen dem abzugsseitigen Ende der an der Innenseite 132 der Abdeckung 130 mündenden Mündung 143 des Fadeneinlegeschlitzes 14 von der Fadenbildungszone 104 sogar grösser. Weiterhin schliesst der Fadeneinlegeschlitz 14 mit der Drehrichtung (Pfeil P10) des in den Keilspalt 102 hineindrehenden Friktionsspinnelementes 101 einen Neigungswinkel y von weniger als 90° ein.To make it easier to insert the thread end 300 into the thread insertion slot 14, the latter widens toward the outside 131 of the cover 130 in accordance with FIG. In order to be able to feed the thread end 300 to the thread formation zone in a calm state, the smallest angular distance β between the thread insertion slot 14 and the thread formation zone 104 is at least 90 °. According to FIG. 3, this angular distance β between the take-off end of the opening 143 of the thread insertion slot 14 opening on the inside 132 of the cover 130 from the thread formation zone 104 is even greater. Furthermore, the thread insertion slot 14 includes an angle of inclination y of less than 90 ° with the direction of rotation (arrow P10) of the friction spinning element 101 screwing into the wedge gap 102.

Wie erwähnt, wird das abzugsseitige Ende des Fadenendes 300 durch die Fadenklemme 70 daran gehindert, dass es in die Fadenbildungszone 104 gelangt, zumindest nicht, bevor das der Abzugsseite abgewandte Ende dieses Fadenabschnittes die Fadenbildungszone 104 erreicht hat. Diese Wirkung kann unterstützt werden oder auch allein dadurch erreicht werden, dass das Fadenende 300 schräg auf das sich in den Keilspalt 102 hineindrehende Friktionsspinnelement 101 aufgelegt wird in der Weise, dass das der Abzugsseite abgewandte, d. h. freie Fadenende einen geringeren Abstand vom Keilspalt 102 als das im gleichen Augenblick auf das Friktionsspinnelement 101 aufgelegte, abzugsseitige Ende dieses Fadenendes 300 aufweist. Zu diesem Zweck ist gemäss der in den Fig. 3 und 4 gezeigten Ausführung vorgesehen, dass das abzugsseitige Ende 140 des Fadeneinlegeschlitzes 14 einen grösseren Abstand von der Fadenbildungszone 104 aufweist, als das der Abzugsseite abgewandte Ende 141 des Fadeneinlegeschlitzes 14.As mentioned, the end of the thread end 300 on the draw-off side is prevented by the thread clamp 70 from entering the thread-forming zone 104, at least not until the end of this thread section facing away from the draw-off side has reached the thread-forming zone 104. This effect can be supported or can be achieved solely by placing the thread end 300 obliquely on the friction spinning element 101 turning into the wedge gap 102 in such a way that the side facing away from the take-off side, i. H. free thread end has a smaller distance from the wedge gap 102 than the withdrawal-side end of this thread end 300 placed on the friction spinning element 101 at the same time. For this purpose, according to the embodiment shown in FIGS. 3 and 4, it is provided that the take-off end 140 of the thread insertion slot 14 is at a greater distance from the thread formation zone 104 than the end 141 of the thread insert slot 14 facing away from the take-off side.

Die Vorlage des Fadens 30 vor den Fadeneinlegeschlitz 14 durch die Fadenklemme 70 kann verschieden erfolgen. Wie Fig. 1 zeigt, ist die Fadenklemme 70 sowohl in der horizontalen als auch der vertikalen Ebene schwenkbar, so dass der Faden dem Fadeneinlegeschlitz 14 auch von der Seite her zugeführt werden kann. Um die Fadenklemme 70 auch als Abzugsorgan für die Dauer des Anspinnvorganges benützen zu können, wird die Fadenklemme 70 im Bereich des Fadeneinlegeschlitzes 14 jedoch sinnvollerweise parallel-d. h. in Fadenabzugsrichtung - zu diesem Fadeneinlegeschlitz 14 bewegt, da der Faden auf diese Weise durch ein und dieselbe Schwenkbewegung, evtl. mit einer kurzen Unterbrechung im Bereich des Fadeneinlegeschlitzes 14, dem Fadeneinlegeschlitz 14 und damit dem Keilspalt 102 zugeführt und anschliessend vom Keilspalt 102 wieder abgezogen werden kann.The thread 30 can be presented in front of the thread insertion slot 14 by the thread clamp 70 in various ways. As shown in FIG. 1, the thread clamp 70 can be pivoted in both the horizontal and the vertical plane, so that the thread can also be fed to the thread insertion slot 14 from the side. In order to be able to use the thread clamp 70 as a take-off element for the duration of the piecing process, however, the thread clamp 70 in the area of the thread insertion slot 14 is usefully parallel-d. H. in the thread take-off direction - to this thread insertion slot 14, since the thread is fed in this way by one and the same pivoting movement, possibly with a short interruption in the area of the thread insertion slot 14, the thread insertion slot 14 and thus the wedge gap 102 and then removed again from the wedge gap 102 can.

Um zu gewährleisten, dass das Fadenende 300 exakt in der gewünschten Länge in die Fadenbildungszone 104 gelangt, wird die Anspinnstellung in ganz bestimmter Weise gewählt. Zunächst wird der Faden 30 durch die Trennvorrichtung 53 auf eine definierte Länge gebracht und ausserhalb des Keilspaltes 102 bis in den Längenbereich der Fadenbildungszone 104 gebracht, wo er nach wie vor durch die Fadenklemme 70 gehalten wird. Diese Anspinnstellung wird dabei so festgelegt, dass nach Einschalten der Faserspeisung das nun durch Anlegen des Unterdruckes an dem besaugten Friktionsspinnelement 101 in den Fadeneinlegeschlitz 14 eingesaugte Fadenende 300 den Keilspalt 102 innerhalb des Längenbereiches der Fadenbildungszone 104 erreicht, aber an keinem ihrer Enden über sie hinausreicht. Hierdurch wird der Faden 30 in genau festgelegter Länge auf die sich im Keilspalt 102 befindenden und ein rotierendes Faserbündel 31 bildenden Fasern aufgelegt.In order to ensure that the thread end 300 reaches the thread formation zone 104 exactly in the desired length, the piecing position is selected in a very specific manner. First, the thread 30 is brought to a defined length by the separating device 53 and is brought outside the wedge gap 102 into the length region of the thread formation zone 104, where it is still held by the thread clamp 70. This piecing position is determined such that after switching on the fiber feed, the thread end 300 now sucked into the thread insertion slot 14 by applying the negative pressure to the suctioned friction spinning element 101 reaches the wedge gap 102 within the length range of the thread formation zone 104, but does not extend beyond it at any of its ends. As a result, the thread 30 is placed in a precisely defined length on the fibers located in the wedge gap 102 and forming a rotating fiber bundle 31.

Aus dem Vorstehenden ergibt sich, dass im Prinzip auf die Druckluftdüse 702 verzichtet werden kann, da der Faden 30 allein durch die Wirkung des am Friktionsspinnelement 101 anliegenden Unterdruckes angesaugt wird. Die Druckluftdüse 702 wirkt somit lediglich unterstützend und ermöglicht eine raschere und somit auch zeitlich präzisere Zufuhr des Fadenendes 300 zum Keilspalt 102.It follows from the above that, in principle, the compressed air nozzle 702 can be dispensed with, since the thread 30 is sucked in solely by the action of the negative pressure applied to the friction spinning element 101. The compressed air nozzle 702 thus only acts as a support and enables the thread end 300 to be supplied to the wedge gap 102 more quickly and therefore more precisely in terms of time.

Bei der beschriebenen Ausführung ist die Fadenklemme 70 in Richtung des Fadeneinlegeschlitzes 14 bewegbar. Es hat sich gezeigt, dass es für ein sicheres Anspinnen Vorteile bringt, wenn die Fadenklemme 70 bei Einführen des Fadenendes 300 in den Fadeneinlegeschlitz 14, d. h. bei Zufuhr des Fadenendes 300 zum Keilspalt 102, unterschiedliche Entfernungen vom abzugsseitigen Ende des Keilspaltes 102 und damit der Fadenbildungszone 104 aufweist. Aus diesem Grunde ist die Fadenklemme 70, d. h. ihre Übergabestellung, einstellbar. Je feiner der Faden, desto grösser soll die Länge des sich in der Fadenbildungszone befindlichen Fadenendes 300 ein; umgekehrt braucht die sich im Keilspalt 102 befindende Fadenlänge bei gröberen Garnen nicht so gross zu sein. Das liegt daran, dass bei feineren Garnen die pro Zeiteinheit zugeführte Fasermenge kleiner ist als bei gröberen Garnen, so dass die für eine ausreichende Festigkeit des Ansetzers erforderliche Fasermasse erst nach einer etwas grösseren Zeitspanne erreicht wird.In the described embodiment, the thread clamp 70 is movable in the direction of the thread insertion slot 14. It has been shown that there are advantages for a safe piecing if the thread clamp 70 when the thread is inserted of the 300 in the thread insertion slot 14, ie when the thread end 300 is fed to the wedge gap 102, has different distances from the take-off end of the wedge gap 102 and thus the thread formation zone 104. For this reason, the thread clamp 70, ie its transfer position, is adjustable. The finer the thread, the greater the length of the thread end 300 located in the thread formation zone; conversely, the thread length located in the wedge gap 102 need not be so great for coarser yarns. This is due to the fact that the amount of fiber supplied per unit of time is smaller in the case of finer yarns than in the case of coarser yarns, so that the fiber mass required for sufficient strength of the piecer is only reached after a somewhat longer period of time.

Alternativ oder ergänzend zu der geschilderten Massnahme kann zur Erhöhung der Anspinnsicherheit vorgesehen werden, dass das Auflegen des Fadenendes 300 auf die sich im Keilspalt 102 befindenden Fasern in bezug aud das Einschalten der Faserspeisung bei feinen Fäden später erfolgt als bei groben Fäden. Trotz der bei feinen Fäden geringen Faserliefermenge pro Zeiteinheit kann sich auf diese Weise eine ausreichende Fasermasse im Keilspalt 102 ansammeln, so dass ein sicheres Anspinnen gewährleistet ist. Diese zeitliche Steuerung erfolgt durch entsprechende Steuerung der Bewegung des Armes 700 und der Druckluftdüse 702.As an alternative or in addition to the described measure, it can be provided to increase the piecing security that the thread end 300 is placed later on the fibers located in the wedge gap 102 with respect to the switching on of the fiber feed for fine threads than for coarse threads. In spite of the small fiber delivery quantity per unit of time in the case of fine threads, a sufficient fiber mass can accumulate in the wedge gap 102 in this way, so that reliable piecing is ensured. This timing is done by appropriately controlling the movement of the arm 700 and the air nozzle 702.

Eine weitere unterstützende Massnahme ist eine angepasste Steuerung des Abzuges des Fadens 30 aus der Fadenbildungszone 104. Um dem Fadenende 300 ausreichend Zeit zu geben, sich mit dem im Keilspalt 102 befindenden Faserbündel 31 durch Eindrehen zu verbinden, wird der Faden 30, nachdem er die Fadenbildungszone 104 erreicht hat, lediglich verzögert einem Abzug unterworfen. Dies erfolgt im geschilderten Ausführungsbeispiel durch Stillsetzen der Fadenklemme 70 für das Einführen des Fadenendes 300 in den Fadeneinlegeschlitz 14 und Einhalten einer bestimmten Stillstandszeit bis zum Beginn der den Abzug bewirkenden Schwenkbewegung der Fadenklemme 70. Erfolgt der Anspinnabzug nach Freigabe des Fadens 30 durch die Spule 400, so muss der Zeitpunkt für das Absenken der Spule 400 auf die Spulwalze 401 entsprechend gewählt werden. Auch hierbei ist die Verzögerung bis zum Einsetzen des Fadenabzuges bei feinen Fäden grösser zu wählen als bei groben Fäden.A further supporting measure is an adapted control of the withdrawal of the thread 30 from the thread formation zone 104. In order to give the thread end 300 sufficient time to connect to the fiber bundle 31 located in the wedge gap 102 by twisting, the thread 30, after it has passed the thread formation zone 104 has reached, only subject to a delay after a deduction. In the exemplary embodiment described, this is done by stopping the thread clamp 70 for inserting the thread end 300 into the thread insertion slot 14 and maintaining a certain downtime until the start of the pivoting movement of the thread clamp 70 causing the take-off. If the thread take-off is carried out after the thread 30 has been released by the bobbin 400, the time for lowering the bobbin 400 onto the winding roller 401 must be selected accordingly. In this case too, the delay until the thread pull-in is started is to be chosen larger for fine threads than for coarse threads.

Da das Fadenende 300 auch nach Zuführung zum Keilspalt 1 02 zumindest eine gewisse Zeit von der Fadenklemme 70 gehalten wird, ist sichergestellt, dass der Faden 30 zunächst lediglich mit seinem freien Ende und dann erst mit seinem abzugsseitigen Bereich in die Fadenbildungszone 104 gelangt. Die Zufuhr des Fadenendes 300 in den Keilspalt 1 02 kann aber auch durch Aufhebung der Klemmwirkung der Fadenklemme 70 geschehen, wobei der Anspinnabzug dann durch die wieder auf die Spinnwalze 401 abgesenkte Spule 400 erfolgt. Soll trotz wiedereinsetzenden Fadenabzuges (durch die Spule 400) diese Kontaktaufnahme des abzugsseitigen Fadenbereichs mit der Fadenbildungszone 104 auch nach Freigabe durch die Fadenklemme 70 noch länger verhindert werden, so kann dies mit Hilfe einer abzugsseitig vor den Friktionsspinnelementen 100, 101 angeordnete Fadenführung 73 Fig. 2 geschehen, die aus der gezeigten Position in die gestrichelt gezeigte Position 73' bringbar ist. Diese Fadenführung kann beispielsweise durch einen in Richtung des Pfeiles P9 schwenkbaren Bügel gebildet werden. Hierdurch wird der von der Fadenbildungszone 104 abgezogene Faden 30 in Richtung zur Faserzuführseite, d. h. zu der dem Faserspeisekanal 24 zugewandten Seite, umgelenkt.Since the thread end 300 is held at least for a certain time by the thread clamp 70 even after it has been fed to the wedge gap 1 02, it is ensured that the thread 30 first enters the thread formation zone 104 only with its free end and only then with its region on the take-off side. However, the thread end 300 can also be fed into the wedge gap 1 02 by releasing the clamping action of the thread clamp 70, the piecing draw-off then taking place through the bobbin 400, which is again lowered onto the spinning roller 401. If, despite reinserting thread take-off (through the spool 400), this contacting of the thread-side thread area with the thread formation zone 104 is to be prevented even longer after the thread clamp 70 has released it, this can be done with the help of a thread guide 73 in front of the friction spinning elements 100, 101 Fig. 2 happen, which can be brought from the position shown to the dashed position 73 '. This thread guide can be formed, for example, by a bracket pivotable in the direction of arrow P9. As a result, the thread 30 drawn off from the thread formation zone 104 is moved in the direction of the fiber feed side, ie. H. to the side facing the fiber feed channel 24.

Nachstehend wird anhand der Fig. 2 bis 4 eine andere Abwandlung der beschriebenen Vorrichtung geschildert. Wie diese Figuren deutlich zeigen, ist hierbei der Fadeneinlegeschlitz 14 in seinem der Abzugsseite abgewandten Bereich durch einen Schlitzboden 142 von der Innenseite 132 der Abdeckung 130 getrennt. In der gezeigten Ausführung schliesst dieser Schlitzboden 142 mit der Innenwand der Abdeckung 130 einen spitzen Winkel a ein.Another modification of the described device is described below with reference to FIGS. 2 to 4. As these figures clearly show, the thread insertion slot 14 is separated from the inside 132 of the cover 130 in its area facing away from the take-off side by a slot bottom 142. In the embodiment shown, this slotted base 142 forms an acute angle a with the inner wall of the cover 130.

Als Fadenhaltevorrichtung 7 dient bei dieser Ausführung eine Saugluftdüse 71, welche von der der Abzugsseite abgewandten Seite in das Ende 141 des Fadeneinlegeschlitzes 14 einmündet. Aus Konstruktionsgründen (Platzersparnis) mündet die Saugluftdüse 71 dabei parallel zur Fadenbildungszone 104 in den Schlitzboden 142 ein.In this embodiment, a suction air nozzle 71 serves as the thread holding device 7, which opens into the end 141 of the thread insertion slot 14 from the side facing away from the take-off side. For construction reasons (space saving), the suction air nozzle 71 opens into the slot bottom 142 parallel to the thread formation zone 104.

Durch ein Zuführelement, z. B. in Art der in den Fig. 1 und 5 gezeigten Fadenklemme 70, wird der Faden 30 von der Spule 400 bis vor den Fadeneinlegeschlitz 14 gebracht und der Wirkung des steuerbaren Saugluftstromes in der Saugluftdüse 71 ausgesetzt. Dieser Saugluftstrom übt eine elastische Rückhaltekraft auf den Faden 30 aus und zieht diesen bei Freigabe durch die Fadenklemme 70 weiterhin ab, bis der Faden 30 durch Stillsetzen der während der Fadenrücklieferung zurückgedrehten Spule 400 stillgesetzt ist. Die bewegliche Fadenklemme 70 gibt den Faden 30 nunmehr frei, so dass dieser allein durch die Saugluftdüse 71 gehalten wird.By a feed element, e.g. 1 in the manner of the thread clamp 70 shown in FIGS. 1 and 5, the thread 30 is brought from the bobbin 400 up to the thread insertion slot 14 and is exposed to the effect of the controllable suction air flow in the suction air nozzle 71. This suction air flow exerts an elastic restraining force on the thread 30 and, when released by the thread clamp 70, continues to pull it off until the thread 30 is stopped by stopping the bobbin 400 rotated back during the thread return. The movable thread clamp 70 now releases the thread 30 so that it is held solely by the suction air nozzle 71.

Um bei einem längeren Maschinenstillstand zu verhindern, dass der sich von der Spule 400 bis in die jetzt wirkungslose Saugluftdüse 71 erstrekkende Faden Schlaufen bildet, die beim Anspinnen eine ordnungsgemässe Funktion verhindern können, ist gemäss Fig. 4 pro Spinnstelle zusätzlich je eine ortsfeste Fadenklemme 72 als starres Klemmelement vorgesehen. Diese besitzt in der gezeigten Ausführung ein starres Klemmelement 720, mit welchem ein bewegliches Klemmelement 721 (Pfeil P11) zusammenarbeitet. Dieses bewegliche Klemmelement 721 ist in die eine Bewegungsrichtung durch einen Hubmagneten 722 beaufschlagbar und in der Gegenrichtung durch eine Rückhaltefeder 723 beaufschlagt.In order to prevent the thread, which extends from the spool 400 into the now ineffective suction air nozzle 71, from loops which can prevent proper functioning when spinning, with a longer machine standstill, according to FIG. 4, a fixed thread clamp 72 is additionally provided as per rigid clamping element provided. In the embodiment shown, this has a rigid clamping element 720, with which a movable clamping element 721 (arrow P11) cooperates. This movable clamping element 721 can be acted upon in one direction of movement by a lifting magnet 722 and acted upon in the opposite direction by a retaining spring 723.

Zum Zuführen des Fadenendes 300 zum Keilspalt 102 wird die Saugluft in der Saugluftdüse 71 abgeschaltet und der Faden 30 durch die Fadenklemme 72 freigegeben, so dass das Fadenende 300 aufgrund des am Friktionsspinnelement 101 wirkenden Unterdruckes in den Fadeneinlegeschlitz 14 gesaugt wird. Dabei rutscht das Fadenende 300 längs dem Schlitzboden 142. Um ein Springen des Fadenendes 300 vom Schlitzboden 142 und damit eine unkontrollierte Bewegung des Fadenendes 300 auszuschliessen, ist dieser Schlitzboden 142 im spitzen Winkel a zum Keilspalt 102 geneigt. Damit auch bei dieser Ausführung sichergestellt ist, dass das freie Ende dieses Fadenendes 300 vor dem der Abzugsseite zugewandten Bereich des Fadenabschnittes mit den Fasern im Keilspalt 102 in Kontakt gerät, wird die in Fig. 2 gezeigte Fadenführung 73 für das Anspinnen aus der dargestellten Position in die Position 73' gebracht.To feed the thread end 300 to the wedge gap 102, the suction air in the suction air nozzle 71 is switched off and the thread 30 is released by the thread clamp 72, so that the thread end 300 due to the friction spinning element 101 acting vacuum is sucked into the thread insertion slot 14. The thread end 300 slides along the slot bottom 142. In order to prevent the thread end 300 from jumping from the slot bottom 142 and thus an uncontrolled movement of the thread end 300, this slot bottom 142 is inclined at an acute angle a to the wedge gap 102. In order to ensure in this embodiment that the free end of this thread end 300 comes into contact with the fibers in the wedge gap 102 in front of the region of the thread section facing the take-off side, the thread guide 73 shown in FIG. 2 is used for piecing from the position shown in FIG brought the position 73 '.

Auf diese Weise wird der Faden 30 während des Anspinnvorganges in Richtung zur Faserzuführseite hin umgelenkt.In this way, the thread 30 is deflected towards the fiber feed side during the piecing process.

Zur Anpassung an verschiedene Garnstärken kann bei der in Fig. 4 gezeigten Ausführung vorgesehen werden, dass die Fadenklemme 72 in verschiedene Positionen parallel zum Keilspalt 102 verstellbar ist (Pfeile P12).In order to adapt to different thread sizes in the embodiment shown in FIG. 4, it can be provided that the thread clamp 72 can be adjusted in different positions parallel to the wedge gap 102 (arrows P12).

Um eine definierte Fadenlänge für das Anspinnen zu erhalten, kann in verschiedener Weise verfahren werden. So ist es möglich, den Faden 30 mit Hilfe der erwähnten Trennvorrichtung 53 auf eine definierte Länge zu bringen. Danach wird der Faden 30 der durch die Saugluftdüse 71 gebildeten Fadenhaltevorrichtung 7 zugeführt und ausserhalb des Keilspaltes 102 über das der Abzugsseite abgewandte Ende der Fadenbildungszone 104 hinaus bis in die Saugluftdüse 71 um eine definierte Länge hineingeliefert. Dies kann beispielsweise durch Freigabe einer zuvor gebildeten Fadenreserve geschehen. Nun werden dem Keilspalt 102 Fasern zugeführt. Der Faden 30 wird in zeitlich abgestimmter Weise hierzu entgegen der elastischen Rückhaltekraft, die die Saugluftdüse 71 auf den Faden 30 ausübt, abgezogen, bis der Faden 30 den Wirkungsbereich der elastischen Rückhaltekraft dieser Saugluftdüse 71 verlässt und durch den Fadeneinlegeschlitz 14 hindurch auf die sich im Keilspalt in der Fadenbildungszone 104 befindlichen Fasern aufgelegt wird. Durch vorübergehendes Unterbrechen des Fadenabzuges kann dabei die gewünschte Verweildauer des Fadenendes 300 in der Fadenbildungszone 104 festgelegt werden.In order to obtain a defined thread length for piecing, there are various ways to proceed. It is thus possible to bring the thread 30 to a defined length with the aid of the separating device 53 mentioned. The thread 30 is then fed to the thread holding device 7 formed by the suction air nozzle 71 and is supplied outside the wedge gap 102 beyond the end of the thread formation zone 104 facing away from the take-off side and into the suction air nozzle 71 by a defined length. This can be done, for example, by releasing a previously formed thread reserve. Now fibers are fed to the wedge gap 102. The thread 30 is pulled in a timed manner against the elastic retention force exerted by the suction air nozzle 71 on the thread 30 until the thread 30 leaves the effective range of the elastic retention force of this suction air nozzle 71 and through the thread insertion slot 14 onto the wedge gap fibers located in the thread formation zone 104 is placed. By temporarily interrupting the thread take-off, the desired dwell time of the thread end 300 in the thread formation zone 104 can be determined.

Um die Zeit-Toleranzen für die Rücklieferung des Fadens 30 in die Saugluftdüse 71 relativ gross halten zu können, wird gemäss der gezeigten Ausführung in der Saugluftdüse 71 eine Trennvorrichtung 710 vorgesehen, die dem rückgelieferten Faden 30 eine definierte Länge verleiht. Darüber hinaus bewirkt diese Trennvorrichtung 710, dass das Fadenende, welches durch die pneumatische Rücklieferung und Halterung durch Aufdrehen und Heraussaugen von einzelnen Fasern eine undefinierte Länge und Form erhalten hat, erneut eine definierte Form erhält.In order to be able to keep the time tolerances for the return of the thread 30 into the suction air nozzle 71 relatively large, a separating device 710 is provided in the suction air nozzle 71 according to the embodiment shown, which gives the returned thread 30 a defined length. In addition, this separating device 710 causes the thread end, which has received an undefined length and shape as a result of the pneumatic return delivery and holding by unscrewing and sucking out individual fibers, again taking on a defined shape.

Zur exakten Steuerung des Anspinnvorganges trägt gemäss Fig. 3 die Abdeckung 130 einen Initiator 80 zur Steuerung eines Verschlussorganes 8, durch welches während des Stillstandes der Spinnstelle 1 und während des normalen Spinnprozesses der Fadeneinlegeschlitz 14 abgedeckt wird. Das Verschlussorgan 8 erstreckt sich parallel zum Fadeneinlegeschlitz 14 im wesentlichen über dessen gesamte Länge und steht mit dem Anker 810 eines Hubmagneten 81 in Verbindung, welcher seinerseits über das Steuerorgan 6 mit dem Initiator 80 in steuermässiger Verbindung steht.For exact control of the piecing process, according to FIG. 3, the cover 130 carries an initiator 80 for controlling a closure element 8, by means of which the thread insertion slot 14 is covered during the standstill of the spinning station 1 and during the normal spinning process. The closure member 8 extends parallel to the thread insertion slot 14 essentially over its entire length and is connected to the armature 810 of a lifting magnet 81, which in turn is in control connection with the initiator 80 via the control member 6.

Der Initiator 80 ist so an der Abdeckung 130 angeordnet, dass das Verschlussorgan 8 den Fadeneinlegeschlitz 14 sofort, wenn der in Richtung zur Saugluftdüse 71 bewegte Arm 700 die Abdekkung 130 erreicht, freigibt. Seine Anordnung am abzugsseitigen oder entgegengesetzten Ende der Abdeckung 130 hängt somit von der Zuführrichtung des Fadens 30 ab.The initiator 80 is arranged on the cover 130 in such a way that the closure member 8 immediately releases the thread insertion slot 14 when the arm 700 moved in the direction of the suction air nozzle 71 reaches the cover 130. Its arrangement at the trigger-side or opposite end of the cover 130 thus depends on the feed direction of the thread 30.

An der Abdeckung ist weiterhin eine Schaltfahne 74 vorgesehen, die in einem als Initiator ausgebildeten Schalter (nicht gezeigt) am Arm 700 einen Impuls auslöst, wenn die Fadenklemme 700 ihre Übergabestellung erreicht hat. Dieser zweite Initiator bewirkt ein Öffnen der Fadenklemme 70, so dass der Faden 30 in die Saugluftdüse 71 gesaugt werden kann. Ausserdem kann dieser zweite Initiator mit einer Steuervorrichtung zur Steuerung des Anspinnvorganges in Verbindung stehen und der Auslösung des Anspinnprogrammes dienen.Furthermore, a switching flag 74 is provided on the cover, which triggers a pulse on the arm 700 in a switch (not shown) designed as an initiator when the thread clamp 700 has reached its transfer position. This second initiator causes the thread clamp 70 to open, so that the thread 30 can be sucked into the suction air nozzle 71. In addition, this second initiator can be connected to a control device for controlling the piecing process and can be used to trigger the piecing program.

Bei der beschriebenen Ausführung, bei welcher jede Spinnstelle 1 individuell angesponnen wird, ist das Verschlussorgan 8 von dem längs der Maschine verfahrbaren Wartungswagen 5 aus ansteuerbar. Ist jedoch eine Vorrichtung zum Massenanspinnen einer Vielzahl von Offenend-Friktionsspinnvorrichtungen 10 vorgesehen, so kann dieses Verschlussorgan 8 auch von einer maschinenseitigen Steuervorrichtung aus zentral ansteuerbar sein.In the embodiment described, in which each spinning station 1 is individually spun on, the closure member 8 can be controlled from the maintenance carriage 5 which can be moved along the machine. If, however, a device for mass piecing a plurality of open-end friction spinning devices 10 is provided, this closure member 8 can also be controlled centrally from a machine-side control device.

Wie sich aus der vorstehenden Beschreibung ergibt, kann der Erfindungsgegenstand in vielfältiger Weise abgewandelt werden und ist somit nicht auf die gezeigten Ausführungsbeispiele begrenzt. Weitere Abwandlungen sind durch Austausch von Merkmalen untereinander oder durch ihren Ersatz durch Äquivalente sowie Kombinationen hiervon möglich und fallen in den Rahmen der vorliegenden Erfindung. So ist die Erfindung nicht auf die als Fadenklemme 70 ausgebildete Ausführung einer Fadenrückliefervorrichtung eingeschränkt, da statt dieser Fadenklemme 70 auch ein pneumatischer Greifer Anwendung finden kann.As can be seen from the above description, the subject matter of the invention can be modified in many ways and is therefore not limited to the exemplary embodiments shown. Further modifications are possible by exchanging features with one another or by replacing them with equivalents and combinations thereof and fall within the scope of the present invention. Thus, the invention is not restricted to the design of a thread return device designed as a thread clamp 70, since instead of this thread clamp 70 a pneumatic gripper can also be used.

Bei den geschilderten Ausführungsbeispielen mündet der Faserspeisekanal 24 direkt in die Fadenbildungszone 104, während der Fadeneinlegeschlitz 14 gegenüber der Umfangsfläche des besaugten Friktionsspinnelementes 101 mündet; bei entsprechender zeitlicher Steuerung von Faserzufuhr und Fadenrücklieferung kann aber auch vorgesehen werden, dass die Fasern auf die Mantelfläche des Friktionsspinnelementes 101 gespeist und durch dessen Rotation in die Fadenbildungszone 104 gebracht werden, während der Fadeneinlegeschlitz direkt in die Fadenbildungszone 104 mündet.In the described exemplary embodiments, the fiber feed channel 24 opens directly into the thread formation zone 104, while the thread insertion slot 14 opens towards the peripheral surface of the suctioned friction spinning element 101; with appropriate timing of fiber supply and thread return, it can also be provided that the fibers are fed onto the outer surface of the friction spinning element 101 and brought into the thread formation zone 104 by its rotation, while the thread insertion slot opens directly into the thread formation zone 104.

Claims (42)

1. A method for joining the thread in an open-end friction-spinning device comprising two friction-spinning elements driven in the same direction and forming a negative-pressure wedge- shaped nip, a thread portion being delivered to a thread-joining position dispoed outside the nip and transferred thence to a thread-forming zone in the nip, from which it is drawn off as a continuous thread, after splicing the fibres supplied to the nip, characterised in that the thread is supplied to the nip so that its free end first reaches the thread-forming zone and the supply of fibres to the nip is controlled sothatthethread portion comes in contact with the fibres at the same time as it reaches the thread-forming zone.
2. A method according to claim 1, characterised in that the supply of fibres into the nip starts before the thread portion has reached the thread-forming zone.
3. A method according to claim 1 or 2, characterised in that if the thread breaks the fibre supply to the friction-spinning elements is interrupted and the elements are stopped and restarted outside the nip while the thread is being returned to the joining position, after which the supply of fibres to the nip is allowed to continue.
4. A method according to claim 3, characterised in that when the friction-spinning elements are stopped, fibres are briefly supplied to the negative-pressure nip, after which the suction of the nip is stopped and the fibres are sucked from the nip, after which the friction-spinning elements are again driven and the supply of fibres to the nip is allowed to restart in time with the previous stoppage of the fibre supply.
5. A method according to one or more of claims 1 to 4, characterised in that the friction-spinning elements are driven at reduced speed during the supply of the thread portion to the thread-forming zone until drawing-off of the thread has started.
6. A method according to one or more of claims 1 to 5, characterised in that when the thread is drawn off from the thread-forming zone it is deflected in the direction towards the fibre supply end.
7. A method according to one or more of claims 1 to 6, characterised in that the thread is placed outside the nip on the friction-spinning element rotating into the nip and supplied thereby to the nip.
8. A method according to claim 7, characterised in that the thread portion is laid obliquely on the friction-spinning element rotating into the nip so that the free thread end is at a shorter distance from the nip than the thread portion at the drawing-off end of the friction-spinning element.
9. A method according to one or more of claims 1 to 8, characterised in that the thread-joining position is chosen so that the thread brought into the joining position and transferred to the thread-forming zone, extends, before being drawn off, only as far as the thread-forming zone to which the fibres are supplied.
10. A method according to one or more of claims 1 to 9, characterised in that the thread is brought to a specific length, delivered outside the nip to the length region of the thread-forming zone, the thread portion is held in this position by clamping, fibres are then supplied to the nip, and the thread is then laid on the fibres in the nip.
11. A method according to claim 10, characterised in that the clamping of the thread portion in the case of finer threads occurs at a greater distance from the drawing-off end of the nip than for coarse threads.
12. A method according to one or more of claims 9 to 11, characterised in that the thread clamping is release in order to lay the thread portion on the fibres in the nip.
13. A method according to one or more of claims 9 to 11, characterised in that a clamping station movable in the thread drawing-off direction supplies the thread to the nip and subsequently draws it away from the nip.
14. A method according to one or more of claims 10 to 13, characterised in that the supply of thread to the nip is assisted by a stream of compressed air.
15. A method according to claim 13 or 14, characterised in that the movable clamping station delivers the thread to a storage station.
16. A method according to claim 15, characterised in that the thread previously supplied to the storage station by the clamping station movable in the drawing-off direction is transferred to a newly- inserted empty former.
17. A method according to one or more of claims 1 to 8 or 10 to 16, characterised in that the thread is brought to a specific length, returned for a specific distance outside the nip and via the end of the thread-forming zone remote from the drawing-off end and into the range of operation of an elastic retaining force, fibres are then supplied to the nip and the thread is drawn off against the elastic retaining force and, after leaving the range of action of the retaining force, is laid on the fibres in the nip.
18. A method according to one or more of claims 1 to 17, characterised in that in the case of fine threads, the thread is laid on the fibres in the nip later than in the case of coarse threads.
19. A method according to one or more of claims 1 to 18, characterised in that the thread is delayed before being drawn off after reaching the thread-forming zone.
20. A device for working the method according to one or more of claims 1 to 19, comprising a cover covering the friction-spinning elements and holding a fibre supply duct, characterised in that the cover (130) in addition to the fibre supply duct (24) comprises a thread feeder slot (14) extending substantially in the longitudinal direction of the friction-spinning elements (100, 101 ) and reaching from the outside (131) of the cover (130) to the inside thereof (132) and from the drawing-off end up to, but not further than, the mouth end (240) of the fibre supply duct (24) remote from the drawing-off side, a thread-holding device (7) holds the thread (30) substantially parallel to the thread feeder slot (14) and a thread guide (70, 72, 73) is provided and holds the thread (30) away from the nip (102) at the drawing-off end of the friction-spinning elements (100, 101) until the thread portion has reached the nip (102).
21. A device according to claim 20, characterised in that the thread guide is constructed as a deflecting means (73) by means of which the thread (30) leaving the friction-spinning elements (100, 101) is deflected towards the cover (130).
22. A device according to claim 20 or 21, characterised in thatthe region of the thread feeder slot (14) remote from the drawing-off end is separated by a slotted plate (142) from the inside (132) of the cover (130).
23. A device according to claim 22, characterised in that the slotted plate (142) includes an acute angle (a) with the inner wall (132) of the cover (130).
24. A device according to one or more of claims 20 to 23, characterised in that the thread-holding device (7) is constructed as an suction-air nozzle (71 ) which opens into the end (141) of the thread feeder slot (14) remote from the drawing-off side.
25. A device according to claim 24, characterised in that the suction-air nozzle (71 ) is disposed in the slotted tray (142).
26. A device according to claim 25, characterised in that the suction-air nozzle (21 ) opens into the slotted tray (142) parallel to the thread-forming zone (104).
27. A device according to one or more of claims 20 to 26, characterised in that the thread-holding device (7) is constructed as a thread clamp (70, 72).
28. A device according to claim 27, characterised in that the thread clamp (70) is associated with a cutting device (53).
29. A device according to claim 27 or 28, characterised in that the clamp (70) is movable from a position for receiving a thread (30) drawn off a spool (400) into a position for transferring the thread (30) to the thread feeder slot (14).
30. A device according to claim 29, characterised in that the movable thread clamp (70) bears a switch connected to a control device for controlling the thread-joining process and adapted to be operated from the cover (130) when the thread transfer position is reached.
31. A device according to one or more of claims 27 to 30, characterised in that the thread clamp (70, 72) is adjustable along the thread feeder slot (14).
32. A device according to claim 31, characterised in that, in order to transfer the thread (30) at the slot (14) in the drawing-off direction to the mouth (522) of a pneumatic store (52) disposed between the friction-spinning elements (100, 101) and a spooling and winding device (40), the thread clamp (70) is movable and controllable so that it does not release the thread (30) until it is near the pneumatic store (52).
33. A device according to claim 32, characterised by an auxiliary spool (32) which is disposed on a maintenance truck (50) movable along a number of open-end friction-spinning devices (10), and from which the thread (30) is suppliable to the clamp (70).
34. A device according to one or more of claims 27 to 33, characterised in that the clamp (70, 72) is associated with a compressed-air nozzle (702) directed towards the thread feeder slot (14).
35. A device according to one or more of claims 20 to 34, characterised in that the fibre supply duct (24) opens into the nip (102) and the thread feeder slot (14) opens outside the nip (102) towards the peripheral surface of the friction spinning element (101) rotating into the nip (102).
36. A device according to claim 35, characterised in that the withdrawal end (141) of the thread feeder slot (14) is further from the thread-forming (104) than the end of the thread feeder slot (14) remote from the drawing-off side.
37. A device according to claim 35 or 36, characterised in that the angular distance ((3) between the thread-forming zone (104) and the drawing-off end of the mouth (143) of the slot (14) opening on to the inside (132) of the cover (130) is greater than 90°.
38. A device according to one or more of claims 35 to 37, characterised in that the thread feeder slot (14) includes an angle of inclination (y) of less than 90° with the direction of rotation (P10) of the friction-spinning element (101) rotating into the nip (102).
39. A device according to one or more of claims 20 to 38, characterised in that the thread feeder slot widens towards the outside (131) of the cover (130).
40. A device according to one or more of claims 20 to 39, characterised in that the thread feeder slot (14) is coverable by a controllable closure means (8).
41. A device according to claim 40, characterised in that the closure means (8) is controllable by a maintenance truck (5) movable along a number of open-end friction-spinning devices (10).
42. A device according to one or more of claims 22 to 41, characterised in that the friction-spinning elements (100, 101) are associated with a thread monitor (61 ) controlling their drive and an auxiliary drive means (54) controllable from a maintenance truck (5) movable along a number of open-end friction-spinning devices.
EP86903236A 1985-06-24 1986-06-05 Process and device for piecing threads on an open-end friction spinning device Expired EP0258248B1 (en)

Applications Claiming Priority (2)

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DE3522518 1985-06-24
DE19853522518 DE3522518A1 (en) 1985-06-24 1985-06-24 METHOD AND DEVICE FOR TAPING AN OPEN-END FRICTION SPINNING DEVICE

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EP0258248A1 EP0258248A1 (en) 1988-03-09
EP0258248B1 true EP0258248B1 (en) 1989-11-08

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EP (1) EP0258248B1 (en)
JP (1) JPS63501159A (en)
CN (1) CN1012442B (en)
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CS (1) CS465286A3 (en)
DE (2) DE3522518A1 (en)
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DE102008055965A1 (en) * 2008-11-05 2010-05-06 Oerlikon Textile Gmbh & Co. Kg Service unit for supplying the work stations of an open-end spinning machine
CN103757766B (en) * 2014-01-29 2015-12-16 天津商业大学 Twisting apparatus

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DE3325928A1 (en) * 1983-07-19 1985-01-31 Fritz 7347 Bad Überkingen Stahlecker METHOD AND DEVICE FOR SPINNING A YARN ON A SPINNING UNIT OF AN OE-FRICTION SPINNING MACHINE
DE3338834A1 (en) * 1983-10-26 1985-05-09 Fritz 7347 Bad Überkingen Stahlecker OE FRICTION SPIDER
DE3338833A1 (en) * 1983-10-26 1985-05-09 Fritz 7347 Bad Überkingen Stahlecker METHOD AND DEVICE FOR SPINNING A YARN ON A SPINNING UNIT OF AN OE-FRICTION SPINNING MACHINE
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CS465286A3 (en) 1992-02-19
JPS63501159A (en) 1988-04-28
WO1987000214A1 (en) 1987-01-15
DE3522518A1 (en) 1987-01-02
BR8606692A (en) 1987-08-11
IN167799B (en) 1990-12-22
CN1012442B (en) 1991-04-24
US4817380A (en) 1989-04-04
EP0258248A1 (en) 1988-03-09
CN86105619A (en) 1987-07-08
DE3666850D1 (en) 1989-12-14
DE3522518C2 (en) 1988-10-06

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