EP0684327B1 - Verfahren und Vorrichtung zum Anspinnen einer Offenend-Rotorspinnmaschine - Google Patents

Verfahren und Vorrichtung zum Anspinnen einer Offenend-Rotorspinnmaschine Download PDF

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Publication number
EP0684327B1
EP0684327B1 EP95105991A EP95105991A EP0684327B1 EP 0684327 B1 EP0684327 B1 EP 0684327B1 EP 95105991 A EP95105991 A EP 95105991A EP 95105991 A EP95105991 A EP 95105991A EP 0684327 B1 EP0684327 B1 EP 0684327B1
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EP
European Patent Office
Prior art keywords
rotor
fibre
housing
spinning
cover
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 - Lifetime
Application number
EP95105991A
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German (de)
English (en)
French (fr)
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EP0684327A1 (de
Inventor
Werner Billner
Josef Breitenhuber
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
Rieter Ingolstadt Spinnereimaschinenbau AG
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Filing date
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Publication of EP0684327A1 publication Critical patent/EP0684327A1/de
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-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
    • D01H4/04—Open-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 imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-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
    • D01H4/48—Piecing arrangements; Control therefor
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning

Definitions

  • Method for piecing an open-end rotor spinning device which has a spinning rotor, which is arranged in a housing covered by a removable cover, in which a negative pressure is brought into effect during the spinning process, the fiber feed being switched on in preparation for the piecing process, the separated fibers however prevented from being deposited in the fiber collecting groove of the spinning rotor and removed by negative pressure until, in coordination with the return of the thread, the fiber removal is ended and the fibers are fed into the fiber collecting groove for integration into the thread end returned to the spinning rotor and the withdrawal of the thread is started, and an apparatus for performing this method.
  • the fibers to be discharged are fed in the housing of the opening device over the inlet opening of the fiber feed channel and to a suction line through which the fibers are discharged and thus prevented from being deposited on the fiber collecting surface (in the fiber groove) (WO 86/01235 A1).
  • This has the advantage that there are no openings in the fiber transport path that are not provided here anyway - for example one Dirt separating opening - but this is bought with the disadvantage that a space-consuming and material-consuming fiber removal and control device is required.
  • DT 19 32 009 discloses a spinning device with a drafting system and a method for piecing.
  • it is proposed to move the rotor and its bearing away from the feed point. This avoids overfeeding of the rotor if the thread breaks.
  • the rotor and its bearing are moved back to their original position.
  • the disadvantage of this method is that, on the one hand, a great deal of effort has to be made for the movably designed storage.
  • the entire rotor including the bearing has to be moved in order to switch the fiber feed, and thus repeat accuracy and speed the switching process, especially in modern, very fast spinning spinning machines, is not sufficient for high piecing quality.
  • DE 31 04 444 A1 describes a method with which fibers are prevented from entering the rotor.
  • the fibers are guided past the circumference of the opening roller, past the fiber feed channel and conveyed into a discharge channel.
  • a disadvantage of this device is a complex construction.
  • the present invention is therefore based on the object of providing a method and a device with the aid of which it is possible, while maintaining the advantages of the known method and the known device, to avoid the disadvantages indicated.
  • the fibers are exposed to a more intense air flow than usual after switching on the fiber feed, which causes the fibers to be deflected from their previous trajectory while overcoming their inertia and fed to the suction via the open rotor edge.
  • no fibers get onto the fiber collecting surface until the fiber removal is ended by returning the rotor cover to its operating position and the fibers are fed back to the fiber collecting groove for integration into the thread end are, wherein the thread end is made available in time coordination with the fiber feed to the fiber collection groove by return delivery to the spinning rotor for piecing.
  • the deflection of the fibers to be removed is favored in that the speed of the air conveying the fibers to the spinning rotor is reduced by introducing auxiliary air into the housing for the duration during which the rotor lid is in its fiber removal position .
  • the negative pressure is first effective in the housing accommodating the spinning rotor and the rotor lid is brought from its operating position into a fiber removal position in which it is lifted so far from the housing that the negative pressure applied to the housing releases auxiliary air can suck in the space surrounding the housing, but there is no additional suction of air in the fiber transport path, so that the fiber feed is then switched on and the fiber stream thus generated is deflected by the resulting lower fiber acceleration after entering the interior of the spinning rotor together with the air stream transporting the fibers and is discharged from the inside of the rotor and the housing via the open rotor edge with the aid of the negative pressure effective in the housing, until fibers are fed to the fiber collecting surface of the rotor lid back into its operating position is brought.
  • the fiber deflection and removal is promoted by the reduction in the speed of the air conveying the fibers to the spinning rotor.
  • a further expedient embodiment of the method according to the invention provides that the in the housing for Effective negative pressure produces an air flow which is oriented essentially in the continuation of the direction of supply of the fibers. If the supply of auxiliary air is provided, it is advantageous for the above-mentioned reason if the auxiliary air is also oriented essentially in the fiber feed direction.
  • the thread After attaching, the thread is pulled out of the spinning rotor again. Too sudden acceleration of the thread pull should be avoided in order to avoid thread breaks.
  • the fibers fed to the spinning rotor for incorporation into the thread end in the take-off are adjusted in quantity to the acceleration.
  • the amount of fiber removed is reduced according to the invention in that the rotor lid is brought from its fiber removal position into its operating position in a controlled manner during the run-up of the thread take-off.
  • the intensity of the auxiliary air flowing into the housing is reduced in a controlled manner during the run-up of the thread take-off in order to adapt the fiber flow supplied to the fiber collecting surface to the speed increase of the newly spun and again drawn thread.
  • the fibers do not enter the spinning rotor obliquely in the direction of the fiber collecting groove, but rather that the fiber stream is deflected before being introduced into the spinning rotor in such a way that it is essentially parallel to that through the Fiber collecting groove oriented level is oriented.
  • a seal which provides a seal between the two parts of the fiber feed channel in the operating position of the rotor lid, and a controllable opening device are assigned to the rotor lid, with the aid of which the rotor lid can be brought into a fiber removal position and into an operating position, the rotor lid in its The fiber removal position is only lifted so far from the housing that the sealing effect between the two parts of the fiber feed channel is still maintained and that the opening device is connected to the control device controlling the piecing process.
  • the part of the fiber feed channel arranged in the rotor lid has such an inlet cross section has that even when the rotor lid is in its fiber removal position, the part of the fiber feed channel arranged in the rotor lid does not protrude into the surface of the outlet cross section of the part of the fiber feed channel arranged in the opening device.
  • the rotor lid has a seal in addition to the seal between the two parts of the fiber feed channel, which cooperates with the housing, and the rotor lid through the opening device at the Movement into the fiber removal position can only be lifted from the housing to such an extent that the sealing effect between the rotor lid and the housing is maintained.
  • the housing has a seal cooperating with the seal of the rotor lid.
  • the seal of the rotor cover and / or the housing is preferably designed as a lip seal.
  • an auxiliary air opening which opens into the housing and is controllably connected to the control device controlling the piecing process, is arranged in the rotor lid.
  • a particularly favorable air flow with respect to fiber removal is achieved if the auxiliary air opening is arranged essentially on the side of the housing opposite the suction air opening with respect to the outlet opening of the part of the fiber feed channel arranged in the rotor lid.
  • the auxiliary air opening is formed by the lip seal of the rotor lid and / or the housing accommodating the spinning rotor, which in the operating position of the rotor lid has an opening in a lip seal covers the receiving annular groove and in the fiber removal position of the rotor cover the opening in the annular groove is free.
  • the method and the device according to the present invention enable the fibers to be removed as preparation for the piecing, so that the fibers suffered during the prior stoppage of the fiber feeding device are discharged and perfect fibers are available for piecing.
  • This goal is achieved without any point in the fiber transport path between the fiber feeding device and spinning rotor must be engaged in the fiber transport path so that the device according to the invention has no negative effects on the normal spinning process.
  • the suction device is used to remove the fibers, which is present anyway at each spinning station in order to generate the vacuum required for spinning, no separate discharge line with its control members is required. As said, the usual suction device with its standard control devices is sufficient, with the exception that the response torque is changed compared to previously known methods.
  • FIG. 1 The open-end spinning device shown in FIG. 1 is only shown schematically, the elements which are not necessary for understanding the invention being omitted.
  • a feed device 2 is provided for feeding a sliver 1 to be spun to an opening roller 3.
  • the fiber sliver 1 which is broken down into individual fibers, passes through a fiber feed channel 30 into the interior of a spinning rotor 4, where the fibers are deposited in the form of a fiber ring in a fiber collecting groove 40.
  • the fiber ring is continuously spun into the end of a thread, not shown, which is drawn off through a thread draw-off tube 5 with the aid of draw-off rollers, not shown, and wound onto a bobbin, also not shown.
  • the feed device 2 for the sliver 1 has a driven delivery roller 20, which is mounted on a continuous drive shaft 200 and can be individually controlled with a clutch, not shown.
  • a feed trough 21 cooperates with the delivery roller 20, which is pivotably supported in a known manner by a housing 31 which accommodates the opening roller 3 mentioned.
  • the spinning rotor 4 is supported by means of a shaft 41 in the usual and therefore not shown manner through support disks or the like and extends through the bottom of a housing 60 which is connected to a vacuum source 610 via a suction air connector 61.
  • the housing 60 is covered by a rotor cover 7, which receives at least part of the fiber feed channel 30 and carries the thread take-off tube 5.
  • the rotor lid 7 has a protruding into the interior of the spinning rotor 4 Lid extension 70, in which the outlet mouth of the fiber feed channel 30 and the inlet mouth of the thread take-off tube 5 are arranged.
  • the cover extension 70 also receives a blow duct 81, which is fed by a compressed air line 8.
  • a valve 82 which can be controlled by an extension 622 of a control lever 62.
  • the control lever 62 is pivotable about a horizontal axis 620 and has a switching cam 621 in the vicinity of this axis 620.
  • a roller 630 which is arranged at one end of a two-armed lever 63, is supported on the control lever 62 in the region of the switching cam 621.
  • the lever 63 is acted upon by a tension spring 631 so that the roller 630 always remains in contact with the control lever 62.
  • the lever 63 is connected to a shift rod 632, which in turn is connected to a linkage 633.
  • This linkage 633 is reproduced in a greatly simplified form in FIG. 1 and, in the embodiment shown, has a balance lever 634, one end of which is connected via a rod 635 to a brake 636 and the other end is connected via a rod 637 to a mechanism (not shown) for Lifting a drive belt 638 from the shaft 41 or to replace the drive belt 638 on the shaft 41.
  • the elements described are part of an open-end spinning device 6, which is covered by a cover 64.
  • the control lever 62 is arranged in a slot of this cover 64 as long as it is in its basic position shown.
  • the cover 64 carries the aforementioned valve 82.
  • the cover 64 also carries the aforementioned rotor cover 7, so that when the cover 64 is folded down, the rotor cover 7 is also removed from the open side of the spinning rotor 4 and from the housing 60 becomes.
  • the cover 64 also carries a release lever 640, which holds the control lever 62 in the position shown by means of a tension spring 641 against the action of the tension spring 631, which acts on the control lever 62 and acts on the lever 63.
  • the cover 64 carries a further unlocking or release lever 642, which is acted upon by a tension spring 643 and is thereby held in the locking position shown, in which the release lever 642 engages behind a nose 310 of the housing 31.
  • the unlocking or release lever 642 has the task of making it possible to lift the rotor lid 7 off the housing 60.
  • an actuating lever or actuating arm 90 is provided, which is pivotably arranged on a piecing device 9, which can be moved along the open-end spinning machine, which has a multiplicity of similar work or spinning positions next to one another, each with an open-end spinning device 6.
  • the actuating arm 90 which carries a roller 900 at its free end, is pivotably mounted on an axis 901 and is connected to a pivot drive 903 via a coupling member 902.
  • a reset lever 904 with a roller 905 is provided on the piecing device 9 at its free end.
  • the reset lever 904 is pivotable about an axis 906 and connected to a pivot drive 908 by means of a coupling member 907.
  • an actuating lever or actuating arm 91 is provided for the actuation of the trigger lever 642, which moves around an axis 910 is pivotable and carries a roller 911 at its free end.
  • a stop designed as a stop arm 912 is non-positively connected to the actuating arm 91 and is mounted on the same axis 910 for this purpose.
  • This stop arm 912 carries a stop roller 913 at its free end.
  • the actuating arm 91 is connected to a swivel drive 915 via a coupling member 914.
  • a movable reset device 94 with a roller 943 at its free end is provided on the movable piecing device 9 and can be pivoted about an axis 942 and is connected via a coupling member 940 to a swivel drive 941.
  • the rotor lid 7 can be brought together with the cover 64 in a known manner in a rest position, in which the cover 64 is folded down so far that the open-end spinning device 6 and its units are accessible.
  • the swivel drives 903, 908, 915 and 941 are connected via a control line 920, 921, 922 and 923 to a control device 92 of the piecing device 9, which in turn is connected via a control line 650 to a machine-side control device 65.
  • the control device 65 which controls various functions not explained here, is also connected in terms of control, among other things, via a control line 651 to the previously mentioned, not shown coupling of the delivery roller 20.
  • the sliver 1 is fed in the usual way to the spinning rotor 4 after it has been dissolved into individual fibers, and is tied into the end of a thread which leaves the spinning rotor 4 through the thread take-off tube 5.
  • the control device 92 of the piecing device 9 actuates the swivel drive 903, which presses the roller 900 of the actuating arm 90 against the release lever 640 and thus releases the control lever 62, which now acts under the action of the tension spring 631 from the slot in the cover 64 mentioned is pushed out towards the piecing device 9.
  • the control lever 62 with its extension 622 releases the valve 82, which in turn now releases the compressed air line 8, so that compressed air enters the blow duct 81.
  • the drive belt 638 is lifted from the shaft 41 of the spinning rotor 4 via the lever 63, the shift rod 632 and the linkage 633 and the brake 636 is brought into contact with the shaft 41.
  • the spinning rotor 4 is thus braked to a standstill.
  • the compressed air already mentioned passes through the blowing duct 81 into the interior of the spinning rotor 4 and thus sweeps over the entire circumferential area of the spinning rotor 4. which is thus cleaned.
  • the thread end to be spun is fed back from the bobbin, possibly a special piecing bobbin, to the spinning device 6 after it has received an optimal shape for the piecing in the usual way. Due to the negative pressure of the negative pressure source 610, the threading end is brought into a defined piecing position within the thread take-off tube 5.
  • the swivel drive 908 is actuated by the control device 92 and the control lever 62 is brought back into alignment with the cover 64 by means of the roller 905, the roller 900 pushing the release lever 640 aside by simultaneously actuating the swivel drive 903.
  • the roller 900 then releases the release lever 640, which now engages behind the upper end of the control lever 62.
  • Now roll 905, which is no longer required, is withdrawn again.
  • the spinning rotor 4 is released by the brake 636, which now starts up again due to the drive belt 638 which has come to rest against the shaft 41 again.
  • the rotor lid 7 is lifted from the housing 60 and thus from the open edge 42 of the spinning rotor 4 and brought into a removal position (position II).
  • the interior of the housing 60 is connected to the circulating air surrounding the housing 60 via a gap between the rotor lid 7 and the housing 60.
  • This opening of the rotor lid 7 is controlled by the movable piecing device 9.
  • the swivel drive 915 which actuates the actuating arm, is actuated by the control device 92 91 presses with its roller 911 against the trigger lever 642.
  • the release lever 643 is unhooked from the nose 310 of the housing 31, whereupon the cover 64 falls due to the force of gravity in the direction of the piecing device 9 until the cover 64 comes to rest against the stop roller 913, which now assumes the position 913a (see dashed illustration ).
  • This tilting of the cover 64 is brought about in that, with respect to the axis 620, the entire mass of the cover 64 and the parts connected to it are arranged on the side of the axis 620 facing the piecing device 9.
  • the clutch (not shown) of the delivery roller 20 is now actuated via the machine-side control device 65, so that the sliver feed to the opening roller 3 is resumed.
  • the combed fibers from the front end of the sliver 1 enter the fiber feed channel 30.
  • the rotor cover 7 occupies position II, in which, due to the negative pressure generated by the vacuum source 610, auxiliary air from the housing 60 through the gap between the rotor cover 7 and the housing 60 surrounding space is sucked in, the vacuum effect exerted by the vacuum source 610 in the fiber feed channel 30 is reduced, so that the acceleration of the air transporting the fibers within the fiber feed channel 30 is reduced in comparison to normal spinning operation, in which the rotor lid 7 has its operating position (position I ) occupies in which no air can penetrate into the housing 60 between the housing 60 and the rotor lid 7.
  • the fibers have - compared to the spinning process - a lower inertia. They thus better follow the transport air flow sucked over the open rotor edge (edge 42 of the spinning rotor 4) into the suction air nozzle 61 and become dissipated together with this.
  • This removal of the fibers is further promoted by the fact that because of the lifting of the rotor cover 7 from the housing 60 and transfer into its position II, the deflection required for removing the air and the fibers is anyway less than during the normal spinning process, during which the rotor cover 7 is in position I.
  • This band end thus contains a length range which is not or only partially suitable for piecing, the impairment of the band end depending on the downtime of the fiber feeding device 2 with the opening roller 3 running.
  • the part of the fiber sliver 1 which is undesirable for piecing is removed.
  • the end of the thread is returned to the spinning rotor 4 in its fiber collecting groove 40 in mutual timing and by returning the rotor cover 7 to its operating position (position I) - with the aid of the reset lever 94 controlled by the swivel drive 941 and its roller 943 - the fibers are delivered into the fiber collecting groove 40 of the spinning rotor 4, where the fibers and the thread end unite.
  • the thread is then withdrawn from the fiber collecting groove 40 of the spinning rotor 4 with the continuous incorporation of fibers and wound onto a spool (not shown). The piecing process is now complete.
  • the inlet mouth 300 of the part of the fiber feed channel 30 located in the rotor lid 7 is so large that the part of the fiber feed channel 30 arranged in the rotor lid 7 is neither in the position I nor in the position II of the rotor lid 7 in the area of the Exit cross section of the part of the fiber feed channel 30 arranged in the opening device protrudes so that the fibers emerging from the part of the fiber feed channel 30 arranged in the housing 31 can reach the part of the fiber feed channel 30 located in the rotor lid 7 unhindered by protruding edges. For this reason, the part of the fiber feed channel 30 that has the inlet mouth 300 is funnel-shaped and dimensioned accordingly.
  • a seal 32 is provided in the housing 31 (and / or in the rotor cover 7), both in the position I and in the position II of the rotor cover 7 for a secure seal between the housing 31 and the rotor lid 7 and prevents air from being sucked into the fiber transport path.
  • the housing 60 and / or the rotor lid 7 (each) carries or carry a seal 600 which is designed in this way that it seals the interior of the housing not only in position I of the rotor cover 7, but also in its position II with respect to the atmosphere surrounding the housing 60.
  • FIGS. 3 and 4 An embodiment in which the sealing effect between the rotor lid 7 and the housing 60 is also maintained in the position II of the rotor lid 7 is shown in FIGS. 3 and 4, with FIG. 3 the rotor lid 7 in its position I, ie in its operation - And closed position, and Fig. 4 shows in its position II, ie in its fiber removal position.
  • Both the housing 60 receiving the spinning rotor 4 and the rotor cover 7 each have an undercut annular groove 601 or 71, in each of which a lip seal 602 or 710 protruding from the annular groove 601 or 71 is arranged.
  • the lips 603 and 711 lie against the base body of the lip seals 602 and 710 as long as the rotor lid 7 is in its position I. However, if the rotor lid 7 is brought into its position II, the lips 603 and 711 spread apart from the base bodies of the two lip seals 602 and 710 and push the base bodies of the lip seals 602 and 710 out of the ring grooves 601 and 71, insofar as this is the position of the rotor lid 7.
  • the fiber guide can be used for both the spinning process and the fiber removal immediately before the actual piecing is further favored in that the fibers are not fed obliquely to the plane through the fiber collecting groove 40 into the spinning rotor 4 (see FIG. 1), but instead pass from the fiber feeding channel 30 into a slot 33 which is oriented parallel to the plane mentioned.
  • the fibers reach the same height line on the inner wall of the spinning rotor 4, which leads to a particularly uniform fiber deposition in the fiber collecting groove 40, so that a particularly good quality thread is spun.
  • the fiber removal is particularly favored in that the fibers from their fiber feed direction, which they have received in the fiber feed channel 30, into a plane parallel to the plane through the fiber collecting groove 40 and thus also be oriented to the plane through the open edge 42 of the spinning rotor 4, this slot 33 in the position II of the rotor lid 7 already being lifted out of the interior of the spinning rotor 4 to a certain extent, so that a large part of the slot 33 leaving fibers to fly over the open edge 42 of the spinning rotor 4 does not need to be deflected at all in order to get into the space surrounding the spinning rotor 4 within the housing 60.
  • the suction air nozzle 61 is arranged essentially in the extension of the fiber feed channel 30.
  • an air flow is generated by the vacuum source 610 in the spinning rotor 4, which air flow is oriented essentially in the continuation of the feed direction of the fibers leaving the fiber feed channel 30, which promotes fiber removal, since the deflection of the transport air is as small as possible.
  • a controllable air supply connection (not shown) can open into the housing 60 in relation to the suction air nozzle 61 in order to introduce auxiliary air into the housing 60 during fiber removal .
  • This auxiliary air flow favors the supply of the fibers to the suction air connection 61, since it is oriented essentially in the direction of the fiber supply.
  • This supplied air flow is expediently guided in such a way that it reaches the spinning rotor 4 from the side opposite the suction air nozzle 61 and leaves the spinning rotor 4 in the region of the exit of the fiber feed channel 30 and thereby takes along the fiber stream leaving the fiber feed channel 30 and over the open edge 42 of the spinning rotor 4 leads away.
  • the fiber feed channel 30 is oriented essentially in the direction of the suction air nozzle 61.
  • an air supply duct 72 is arranged in the rotor cover 7 and (in contrast to the design shown in FIGS. 3 and 4) has an outlet opening which as directly as possible into the spinning rotor 4, i.e. within the circular area enclosed by the open edge 42 of the spinning rotor 4, opens out.
  • an air supply duct 720 - with respect to the fiber transport direction - opens behind the outlet mouth of the fiber feed duct 30 into the slot 33, so that the fibers are exposed to the air flow entering through the slot 33 from the slot 33 and fed to the suction air nozzle 61.
  • the air supply duct 72 or 720 is interrupted in the region of the annular groove 71 by the lip seal 710 (position I of the rotor cover 7).
  • position II the lip 711 which spreads apart from the base body of the lip seal 710 releases the window 712, which now allows air to flow through. If the rotor lid 7 returns to its operating position (position I), the air flow is prevented again.
  • a lip seal 602 or 710 can also be used. Depending on the training, this seal can then also, if necessary control a supply air opening. However, if desired at all, a supply air opening can also be provided, which can be controlled depending on the position I or II of the rotor cover 7, but works independently of the seal.
  • the housing 60 can be covered by a cover 67, which slidably receives a rotor cover 670. With the position 67 of the cover relative to it unchanged, this rotor lid 670 can assume a first position I, the operating position during the normal spinning process, and a second position II, the fiber removal position during the piecing preparation.
  • a sleeve 671 is provided as a guide for the rotor cover 670 in the cover 67, in which the thread take-off tube 5 is guided, which in turn is rigidly connected to the rotor cover 670 and has a stop ring 50 at its end located outside the cover 67, with which a fork 93 can work together.
  • the fork 93 is mounted on the piecing device 9 (FIG. 1) and can be moved both horizontally and vertically in such a way that it reaches the stop position shown, in which it cooperates with the stop ring 50, and also moves it out of this stop position can be.
  • a compression spring 672 is supported on the one hand on the inner wall of the cover 67 and on the other hand on the radial surface of the rotor cover 670 facing the end face of the cover 67.
  • the rotor lid 670 has a cover extension 70, in which a partial section 301 of the fiber feed channel 30 is arranged.
  • the rotor lid 670 In the operating position, the rotor lid 670 assumes the position I shown in broken lines, in which the subsection 301 forms the continuation of the fiber feed channel 30. If, at the end of the fiber supply to the fiber collecting groove 40, the fiber stream is to be fed to the suction air nozzle 61 over the open edge 42 of the spinning rotor 4, the rotor lid 670 is brought into position II with the aid of the fork 93 brought into engagement with the stop ring 50.
  • the section 301 of the fiber feed channel 30 has dimensions such that even in this position of the rotor cover 670, the fibers safely reach the section 301.
  • no protruding edges protrude into the fiber transport path - although such projections may be necessary. can be tolerated to influence the fiber orientation (also in a device according to FIG. 1).
  • the fork 93 releases the stop ring 50 again, so that the rotor lid 670 returns to its position I by the action of the compression spring 672.
  • the air flow supplied to the suction air nozzle 610 is intensified.
  • a changeover valve (not shown) is provided in the suction air line leading to the vacuum source 610, which in one position connects the housing 60 to a first suction line in which the vacuum required for spinning is provided, and in the other position with a second suction line (not shown), which increases Provides negative pressure.
  • the housing 60 is connected to this second suction line with the increased negative pressure in preparation for piecing to remove the fibers, a more intensive air flow also arises in the fiber feed channel 30 or in the subsection 301 thereof, so that the out of the fiber feed channel 30 or its subsection 301 emerging fibers better follow the intensification of this suction air flow and thus be prevented from accumulating in the fiber collecting groove 40 of the spinning rotor 4.
  • the degree of opening of the rotor lid 7 (Fig. 1, 3 and 4) or 670 (Fig. 2) significantly influences the removal of fibers in the suction air nozzle 61. For this reason, it is possible to determine the amount of the suction air nozzle 61 and thus also the To control the amount of fibers fed to the fiber collecting groove 40 by not only suddenly moving the rotor cover 7 or 670 back from its fiber removal position (position II) to its operating position (position I), but rather by gradually moving this movement in a controlled manner. There is thus a division of the fiber stream leaving the fiber feed channel 30. This is of particular advantage for piecing.
  • auxiliary air stream flowing into the housing 60 is reduced in a controlled manner. In the case of the embodiment shown in FIGS. 3 and 4, this takes place simultaneously with and by the closing movement of the rotor cover 670. Otherwise, a correspondingly controllable throttle valve can be provided in the line supplying the auxiliary air (not shown).
  • FIG. 5 shows a further embodiment of the invention.
  • a rotor lid 770 has a fiber feed channel 772.
  • a compressed air nozzle 771 is arranged shortly before the mouth of the fiber feed channel 772.
  • the compressed air nozzle 771 has a feed line which opens at the cover 67. From there it can be supplied with compressed air by means of a compressed air source, not shown.
  • the compressed air source can be delivered to the supply line.
  • the compressed air nozzle 771 is inclined towards the mouth of the fiber feed channel 772. It causes a fiber and air flow, which emerges from the mouth of the fiber feed channel 772, is supplied with additional compressed air and is deflected in such a way that both the fiber stream and the air stream are deflected out of the rotor interior.
  • the fiber flow and air flow are led out of the housing via the suction air connection 61.
  • the control for the compressed air supply can be arranged either at each spinning station or on the spinning machine or on a movable maintenance device, not shown. In the latter case, it is delivered to the spinning station at which a piecing process is to be carried out.
  • the control device has an operative connection to a higher-level control device, which controls the use and the end of the compressed air supply and the return of the thread end.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP95105991A 1994-05-26 1995-04-21 Verfahren und Vorrichtung zum Anspinnen einer Offenend-Rotorspinnmaschine Expired - Lifetime EP0684327B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4418413A DE4418413C1 (de) 1994-05-26 1994-05-26 Verfahren und Vorrichtung zum Anspinnen einer Offenend-Rotorspinnmaschine
DE4418413 1994-05-26

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EP0684327A1 EP0684327A1 (de) 1995-11-29
EP0684327B1 true EP0684327B1 (de) 1997-10-01

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DE19631234A1 (de) * 1996-08-02 1998-02-05 Rieter Ingolstadt Spinnerei Vorrichtung zur Steuerung eines Luftstromes in einer Offenend-Spinnvorrichtung
CZ273997A3 (cs) * 1997-09-02 1999-02-17 Rieter Elitex A.S. Spřádací ústrojí rotorového dopřádacího stroje
DE19821643B4 (de) * 1998-05-14 2010-11-18 Novibra Gmbh Verfahren und Offenend-Rotorspinnmaschine zum Anspinnen eines Fadenendes
DE19956264B4 (de) * 1999-11-23 2007-12-13 Rieter Ingolstadt Spinnereimaschinenbau Ag Verfahren zum Reinigen eines Offenend-Spinnrotors
US6314712B1 (en) * 2000-03-29 2001-11-13 Rieter Ingolstadt Spinnereimaschinenbau Ag Apparatus and process for the control of piecing in spinning devices
CZ301241B6 (cs) * 2004-08-05 2009-12-16 Rieter Cz A. S. Zarízení k tesnení prostoru v dutém hrídeli sprádacího rotoru rotorového doprádacího stroje pro výrobu složkové príze
CZ302815B6 (cs) * 2010-05-04 2011-11-23 Šafár@Václav Zpusob sprádání vláken ve sprádacím rotoru pridruženým krutným orgánem a zarízení k provádení zpusobu
CZ303613B6 (cs) * 2011-11-28 2013-01-09 Rieter Cz S.R.O. Zpusob prípravy konce príze pro zaprádání na rotorových doprádacích strojích a sprádací rotor
CN103668585B (zh) * 2013-11-19 2016-01-27 经纬纺织机械股份有限公司 转杯纺纱机吸纱气阀控制装置
DE102015115912A1 (de) * 2015-09-21 2017-03-23 Maschinenfabrik Rieter Ag Kanalplattenadapter und Offenendspinnvorrichtung mit einem Kanalplattenadapter
DE102017118390A1 (de) * 2017-08-11 2019-02-14 Saurer Spinning Solutions Gmbh & Co. Kg Offenend-Spinneinrichtung
DE102019120980A1 (de) * 2019-08-02 2021-02-04 Maschinenfabrik Rieter Ag Spinnmaschine mit einer Vielzahl nebeneinander angeordneter Arbeitsstellen und einer verfahrbaren Wartungseinrichtung mit einem pneumatischen Arbeitsorgan sowie Verfahren zum Versorgen des pneumatischen Arbeitsorgans mit Unterdruck

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DE4418413C1 (de) 1995-08-24
CZ135195A3 (en) 1995-12-13
DE59500741D1 (de) 1997-11-06
EP0684327A1 (de) 1995-11-29
CZ286182B6 (cs) 2000-02-16
US5640838A (en) 1997-06-24

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