EP3276057B1 - Thread guide unit, open-end spinning machine and method for operating a spinning station - Google Patents
Thread guide unit, open-end spinning machine and method for operating a spinning station Download PDFInfo
- Publication number
- EP3276057B1 EP3276057B1 EP17183275.1A EP17183275A EP3276057B1 EP 3276057 B1 EP3276057 B1 EP 3276057B1 EP 17183275 A EP17183275 A EP 17183275A EP 3276057 B1 EP3276057 B1 EP 3276057B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- guide unit
- compressed air
- spinning
- draw
- 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.)
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Links
- 238000009987 spinning Methods 0.000 title claims description 95
- 238000000034 method Methods 0.000 title claims description 32
- 238000007383 open-end spinning Methods 0.000 title claims description 21
- 238000002360 preparation method Methods 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 230000008901 benefit Effects 0.000 description 6
- 235000013351 cheese Nutrition 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000010042 air jet spinning Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
-
- 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
- D01H4/40—Removing running yarn from the yarn forming region, e.g. using tubes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/04—Guides for slivers, rovings, or yarns; Smoothing dies
- D01H13/045—Guide tube
-
- 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
- D01H4/02—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 a fluid, e.g. air vortex
-
- 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
- D01H4/22—Cleaning of running surfaces
-
- 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
- the present invention relates to a thread guide unit for pulling a thread from a rotor of a spinning station of an open-end spinning machine with a draw-off tube and a compressed air nozzle.
- the invention relates to an open-end spinning machine with a plurality of spinning stations, each spinning station having a spinning unit, a thread guide unit, take-off rollers, a winding unit and a thread attachment unit, and a method for operating a spinning station of an open-end spinning machine, a spinning unit producing a thread, the thread is drawn off from take-off rollers by a thread guide unit and is wound onto a spool by a winding unit and then, when the thread has to be attached, a thread attachment unit moves a thread end to the thread guide unit, where the thread end is first introduced into the thread guide unit and by a negative pressure prevailing in the spinning unit is then sucked into the spinning unit.
- the strikes DE 25 34 816 proposes to return the broken thread end to the spinning rotor.
- both an induced draft in the rotor housing is switched on and the ejector nozzle is started.
- take-off rollers are turned back in the direction of rotation reversed in the normal spinning process, the piece of thread returned being blown through the ejector nozzle into a thread exit opening of the thread take-off tube and there through the prevailing suction is drawn in.
- the thread is then separated by means of a thread cutting device.
- the pairs of take-off rollers are then turned back again and the piece of thread returned is blown back into the thread outlet opening by means of the ejector nozzle.
- the draw-off roller pairs are now turned back by such an amount that the thread ends are fed back through the thread draw-off tube exactly into the fiber collecting groove of the spinning rotor. There they connect to the deposited fibers, which fixes the thread breakage.
- the pairs of take-off rollers are now switched to forward running again and the ejector nozzle is deactivated. However, in the course of this process, a large amount of compressed air is required to operate the ejector nozzle.
- German patent specification DE 197 18 768 A1 discloses a method for the pneumatic cleaning of a thread take-off tube of an open-end spinning device, wherein an air flow directed against an irregular inner contour of the thread take-off tube is directed into the interior of the thread take-off tube.
- a threading device with a feed path for feeding a thread in a textile machine, in particular in a spindle section of an air jet spinning machine is also known.
- the air jet spinning machine creates a spinning thread by twisting untwisted, stretched fiber bundles.
- the feed path has a spinning thread outlet, the inside diameter of which is larger than that of the fiber bundle inlet, and an air discharge area in an intermediate section between the inlet and the outlet, in order to discharge part of the air from the thread feed path to the outside.
- the object of the present invention is therefore to reduce the disadvantages mentioned and to further improve the device and the method.
- the object is achieved by a thread guide unit, an open-end spinning machine and a method for operating a spinning station of an open-end spinning machine with the features of the independent claims.
- a thread guide unit for withdrawing a thread from a rotor of a spinning station of an open-end spinning machine with a draw-off tube and a compressed air nozzle.
- the thread coming from the rotor is drawn off through the draw-off tube of the thread guide unit.
- a thread end must be reattached at intervals, for example after a thread break or a cleaner cut.
- a cleaner cut is the deliberate cutting of the thread because it does not have the desired properties, such as thickness or purity.
- To attach the thread end it must be brought back into the rotor through the draw-off tube of the thread guide unit. This movement of the thread end is supported by a directional compressed air flow that emerges from the compressed air nozzle.
- a thread outlet element is provided and an opening of the compressed air nozzle is designed as a gap between the draw-off tube and the thread outlet element.
- the thread exit element enables a gentle exit of the thread from the thread guide unit. This is particularly due to a rounded shape and / or a low-friction surface of the Thread exit element reached. Because the mouth of the compressed air nozzle is designed as a gap between the draw-off tube and the thread outlet element, a particularly compact design can be achieved.
- the mouth of the compressed air nozzle is advantageously ring-shaped.
- the thread is evenly flowed around, which both uses the compressed air most effectively and treats the thread most gently.
- the mouth of the compressed air nozzle can also be semicircular, which directs the thread in the direction of one side of the draw-off tube and is particularly advantageous in combination with a subsequent kink in the draw-off tube.
- the mouth has a plurality of openings which are arranged along a ring, which results in increased structural stability.
- Air guiding elements are provided in the area of the mouth. These air guiding elements serve to generate an air vortex which flows around the thread and thus generates, amplifies and / or maintains a twist of the thread - usually a Z-twist.
- the air guide elements can be assigned to the draw-off tube, the thread outlet element or both.
- the air vortex can also be generated in that the compressed air nozzle is arranged with a component tangential to the mouth. As a result, the compressed air is blown in at an angle to the mouth and also creates an air vortex.
- a compressed air connection in particular a compressed air coupling, is provided for connecting a compressed air hose.
- the compressed air hose can thus be designed to be removable, which is particularly advantageous for maintenance work in which, for example, the compressed air hose or the thread guide unit has to be replaced.
- the thread outlet element is connected to the draw-off tube by gluing, welding, screwing and / or pressing.
- the thread outlet element can thus be produced separately from the draw-off tube and is then connected to the draw-off tube using one of the methods mentioned. If the connection can be separated, for example when screwing or pressing, then thread outlet elements can also be replaced separately, for example if they are worn out or if the thread guide unit is to be optimized for another type of thread.
- the draw-off tube has a change in direction, in particular in the form of a kink, so that the direction of the part of the draw-off tube on which the thread outlet element is arranged corresponds to a draw-off angle of the thread.
- a change in direction of the thread follows the change in direction of the draw-off tube.
- the change in direction of the thread can thus be checked.
- a gentle change in the direction of the draw-off tube therefore results in a gentle change in the direction of the thread, which has a gentle effect on the thread.
- the exhaust pipe has a swirl stopper.
- the twist generated by the rotor is thus stopped in the thread, so that the thread receives only a predetermined amount of twist and consequently has predetermined properties.
- the draw-off tube advantageously has at least one thread sensor. With the help of such a thread sensor, it can first be determined whether there is any thread in the draw-off tube. Thread breaks can also be detected at an early stage. In particular during the attachment process, the thread sensor can be used to determine when the thread end passes the thread sensor. The position of the thread end is known at least at this point in time.
- a fastening means is provided for fastening the thread guide unit to the spinning station.
- the thread guide unit can thus be easily replaced or removed for thorough cleaning.
- a vacuum connection is provided on the thread guide unit. With the help of a vacuum connection, for example, at least some of the compressed air supplied by the compressed air nozzle can be sucked out again, which makes it easier for the vacuum supply assigned to the rotor to maintain a negative pressure.
- fiber fly, dirt and pieces of thread can be extracted via the vacuum connection, which supports the cleanliness of the thread guide unit.
- the exhaust pipe advantageously has an inner diameter which is between 2 mm and 4 mm, preferably between 2.5 mm and 3.5 mm and particularly preferably about 3 mm.
- the inner diameter is the inner diameter that the exhaust pipe predominantly has. Inner diameters with the sizes mentioned have proven to be optimal values for the withdrawal of a thread from a spinning unit. It is also advantageous if the gap of the mouth has a thickness which is between 0.5% and 15%, preferably between 1.5% and 8% and particularly preferably about 3.5% of the inside diameter of the exhaust pipe. The thickness is the distance between the thread outlet element and the draw-off tube at the mouth.
- the values mentioned allow with usual pressures of the compressed air a sufficiently strong compressed air flow and / or sufficiently strong air swirl.
- the thread guide unit is designed in accordance with the preceding description, wherein the features mentioned can be present individually or in any combination.
- each spinning station having a spinning unit, a thread guide unit, take-off rollers, a winding unit and a thread attachment unit.
- the thread comes out of the spinning unit and is drawn off by the take-off rollers via the thread guide unit.
- the thread then comes from the take-off rollers to the winding unit, which winds the thread onto a bobbin, in particular a package.
- the thread guide unit is designed according to one of the preceding claims.
- the compact design of the thread guide unit also helps the open-end spinning machine to achieve a more compact or more efficient design.
- a spinning unit produces a thread.
- the thread is drawn off from take-off rollers by a thread guide unit and wound up from a winding unit onto a bobbin, in particular a package.
- a thread application unit moves a thread end to the thread guide unit. There, the thread end is sucked into the thread guide unit and then into the spinning unit by a negative pressure prevailing in the spinning unit.
- a compressed air flow which emerges in particular from a compressed air nozzle of the thread guide unit, supports the negative pressure prevailing in the spinning unit and thus the sucking in of the end of the thread into the spinning unit, timed with the thread being attached. Thanks to the supportive compressed air flow, the thread is attached faster and more precisely than with the negative pressure prevailing in the spinning unit.
- the thread guide unit is designed as described above. This means that the thread can be treated more gently, the spinning position can be maintained more easily and better, and productivity can be increased.
- the compressed air flow creates an air vortex. This can be achieved, for example, by air guiding elements in the area of a mouth of the compressed air nozzle.
- This air vortex preferably generates and / or amplifies a twist, in particular a Z twist, in the thread. This prevents the thread from losing its twist and possibly becoming loose. If the thread is even subjected to additional twists due to the air vortex, this solidifies the thread in the piecing area and improves the effectiveness of the piecing process.
- the compressed air flow can also be blown through the draw-off tube through the compressed air nozzle while the spun thread is being drawn off and produce an air vortex. The air vortex causes a false twist in the thread, which leads to a curled thread in a known manner.
- a further stream of compressed air which emerges in particular from the compressed air nozzle of the thread guide unit, supports the sucking in of the thread end into the thread guide unit.
- the thread end can also be sucked into the thread guide unit faster and more precisely.
- the stronger air flow can also detect a thread end that is not positioned exactly, which increases the likelihood that the Attaching process is successful, and thus also increases the productivity of the spinning station.
- the thread end after it has been sucked into the thread guide unit and into the spinning unit, is prepared on the edge of a rotor of the spinning unit.
- the preparation on the edge of the rotor on the one hand causes the thread to be shortened to a predetermined length.
- the fibers at the end of the thread are partially freed from their rotation, so that the new fibers connect more easily to the end of the thread.
- the preparation of the thread end at the edge of the rotor has the advantage that both the shortening of the thread and the removal of the rotation of the fibers is carried out with the aid of devices already present at the spinning position. So the rotor does two or three different jobs.
- a compressed air stream is preferably blown through the compressed air nozzle during the suctioning and / or preparation of the thread. Due to the compressed air flow, a higher tensile force of the thread is achieved and the thread is thus tightened more. Without additional compressed air flow, the thread would have to be sucked far into a main vacuum duct in order to obtain the tensile force required for the preparation of the thread end, which has many disadvantages: If several adjacent spinning positions are spun at the same time, there is a risk that thread braids in the main vacuum duct form. The mostly non-constant negative pressure in the main negative pressure channel over the length of the open-end spinning machine also results in different thread tensile forces depending on the position of the spinning station.
- the entire piece of thread located in the main negative pressure duct is produced as waste.
- the required thread tension is ideally achieved when the thread end is not yet in the main vacuum channel. This eliminates or at least reduces the disadvantages mentioned.
- the thread end is advantageously withdrawn after it has been prepared on the edge of the rotor. Through this step the Positioning of the thread end in the rotor is improved and the rotor can be accelerated without the thread end also being rotated.
- the thread end is prepared by hand outside the thread guide unit. Trained operating personnel can produce a very well-prepared thread end in which the rotation of the fibers is canceled to the correct extent. In addition, the thread is only slightly shortened by hand when preparing the thread end and there is hardly any waste. Furthermore, it is advantageous if the thread end is prepared in a thread end preparation unit. Such a thread end preparation unit also enables optimal preparation of the thread end with a comparatively low amount of waste.
- the thread end preparation unit can be assigned to a mobile maintenance unit which is moved to the spinning station for attaching the thread.
- the thread end preparation unit can also be assigned to the spinning station, wherein it is either a separate component or is preferably located in a side arm of the draw-off tube. If the thread end preparation unit is arranged in the side arm of the draw-off tube, the thread-setting process can be carried out particularly quickly because the thread is then already in the draw-off tube and no longer has to be inserted into the draw-off tube.
- the threading of the thread end into the spinning unit is made possible by the rotation of a reversible stepping motor and / or by the loosening of a loop.
- the thread end can be conveyed into the spinning unit for a predetermined distance.
- the thread end is transported through the loosening of a loop a predetermined distance into the spinning unit, provided the loop had a predetermined length.
- the thread end is moved in a controlled manner during the piecing process, which leads to reproducible results. This is both for the quality of the connection of the thread end with the newly spun thread as well as for the reliability of the piecing process.
- a piecing process can thus proceed as follows: The thread end is moved by a thread piecing unit to the thread guide unit. A spinning box or the spinning unit assigned to the spinning station is closed and the end of the thread is sucked into the thread guide unit. The spinning box is now opened and the thread is unwound so that the thread end is conveyed into a suction device of the spinning box or of the spinning unit. The spinning box is then closed almost, but not completely, whereby the thread is pressed against the edge of the rotor. The rotor is now accelerated and the thread is pulled back and forth several times, whereby the thread is separated and prepared at the rotor edge. The thread is then withdrawn from the rotor, but only so far that it is still in the thread guide unit. After the spinning unit has been closed, the thread is fed back into the rotor for attachment.
- the position of the thread end is detected by means of at least one sensor in a draw-off tube assigned to the thread guide unit.
- the known position of the thread end allows the piecing process to be controlled even more precisely, for example by the length of the thread return, or by the choice of the times for the rotor to start up or the start of the thread withdrawal.
- the compressed air flow is preferably controlled taking into account the position of the thread end.
- the attachment of the thread end can also be influenced by the compressed air flow. Both the time and the duration and possibly even the strength of the compressed air flow can be influenced.
- a compressed air stream is used at intervals to clean the thread guide unit and / or the spinning unit is blown through the compressed air nozzle.
- Cleaning with compressed air is efficient and can be carried out with the available means. More complex, for example mechanical, cleaning can thus be carried out at longer time intervals from one another.
- cleaning with the compressed air stream blown through the compressed air nozzle can be carried out before each attachment process and even while the spinning operation is running.
- FIG. 1a shows a schematic side view of a spinning station 1 of an open-end spinning machine in spinning mode.
- Fiber material is introduced into a rotor 2 of a spinning unit 3 of the spinning station and spun into a thread 4.
- the thread 4 is drawn off from the rotor 2 by a pair of draw-off rollers 5 via a thread guide unit 6.
- the thread guide unit 6 has a groove 7 into which a retaining spring 8 of the spinning unit 3 engages and thus connects the thread guide unit 6 to the spinning unit 3.
- the thread 4 is wound up by a traversing unit 9 on a cheese 10.
- the cheese 10 is held by a bobbin holder 11 and driven by a drive roller 12.
- a stream of compressed air is blown through a compressed air nozzle 13 of the thread guide unit 6 to clean the thread guide unit 6 and the spinning unit 3. Dirt and fiber fly are thereby released and extracted by a vacuum device of the spinning unit 3, not shown here.
- a suction nozzle 15, which can be moved by a motor 14, and a thread catcher 16 are not required.
- the thread 4 runs onto the package 10.
- the thread end 17 must first be found and then attached to the spinning unit 3.
- the suction nozzle 15 is displaced by the motor 14 such that the opening of the suction nozzle 15 is just above the surface of the cheese 10.
- the cheese 10 is then slowly opposed by the drive roller 12
- the direction of rotation during spinning is rotated until the thread end 17 is sucked into the suction nozzle 15.
- the suction nozzle 15 is removed from the cross-wound bobbin 10 by the motor 14, so that the thread 4 is stretched between the cross-wound bobbin 10 and the suction nozzle 15.
- the thread catcher 16 can then grip the stretched thread 4. This time is in Figure 1b shown.
- the thread 4 is then inserted by the thread catcher 16 into the traversing unit 9 and the draw-off roller pair 5 and moved until the thread guide unit 6 opens. There, the thread 4 is sucked into the thread guide unit 6 by the negative pressure prevailing in the spinning unit 3. This process is supported by a compressed air stream blown through the compressed air nozzle 13. The thread end 17 is now in the thread guide unit 6, as in Figure 1c shown.
- the draw-off roller pair 5 is then rotated backwards, so that the thread end 17 is moved further into the thread guide unit 6 to the rotor 2 by the negative pressure prevailing in the spinning unit 3, supported by the compressed air flow from the compressed air nozzle 13.
- the thread end 17 is then cut off and prepared at the rotating rotor edge.
- the thread end 17 is then pulled back a little by the pair of draw-off rollers 5. Then the actual attachment takes place, in which the rotor 2 is brought up to its attachment speed and the pair of draw-off rollers 5 is rotated backwards again.
- the thread end 17 is conveyed by the negative pressure prevailing in the spinning unit 3, combined with a time-coordinated compressed air flow from the compressed air nozzle 13, into the rotor 2, where it connects to the fibers located there. The normal spinning operation is then resumed.
- FIG 2 shows a longitudinal section of a simple thread guide unit 6.
- the thread guide unit 6 has a draw-off tube 18 with an inner diameter D and a thread exit element 19.
- a compressed air connection 20 leads to a compressed air nozzle 21, which is provided as a recess in the exhaust pipe 18.
- the compressed air nozzle 21 also comprises an annular air chamber 22 which is formed between the draw-off tube 18 and the thread outlet element 19. The compressed air is evenly distributed through this annular air chamber 22.
- a mouth 23 of the compressed air nozzle 21 is formed as a gap between the draw-off tube 18 and the thread outlet element 19. This allows a particularly compact design.
- the thickness T of this gap influences the strength of the compressed air flow that can be achieved.
- the mouth 23 is also annular, so that the compressed air flow can emerge evenly distributed and flow around the thread from all sides. This is the most efficient way to use the compressed air flow and the thread is treated most gently.
- a thread is drawn out of the rotor by a pair of draw-off rollers through the draw-off tube 18.
- the thread leaves the thread guide unit 6 at the thread outlet element 19.
- the compressed air nozzle 21 is required to blow the thread in the direction of the rotor.
- a stream of compressed air blown through the compressed air nozzle 21 can be used to clean the exhaust pipe and / or the spinning unit.
- the thread guide unit 6 has a compressed air coupling 24 for faster connection and disconnection of a compressed air hose. This brings a time advantage over a conventional compressed air connection, especially for maintenance and / or cleaning work.
- the thread guide unit 6 has a vacuum connection 25, which is also designed as an air coupling. Vacuum is switched on, for example, via the vacuum connection 25 when a thread end is sucked into the thread guide unit 6 for the first time. This negative pressure then supports the negative pressure prevailing in the spinning unit and sucks off at least some of the compressed air blown in by the compressed air nozzle 21. The negative pressure is also switched on when the exhaust pipe 18 is cleaned with the aid of compressed air. Then dirt and fiber fly are sucked off via the vacuum line.
- the thread guide unit 6 further comprises a groove 7. In cooperation with retaining springs of the spinning unit, this groove 7 serves to fasten the thread guide unit 6 to the spinning unit.
- the draw-off tube 18 has a kink 26, so that the thread is drawn off at least substantially in the direction of the part of the draw-off tube 18 on which the thread exit element 19 is arranged.
- the change in direction of the thread on the thread exit element 19 is very slight, which results in a correspondingly low friction of the thread on the thread exit element 19.
- the exhaust pipe 18 also has swirl stop means 27. As a result, the twist in the thread generated by the rotation of the rotor is stopped, which results in a defined twist in the thread and thus constant thread properties.
- a thread sensor 28 is provided in the draw-off tube 18.
- the thread sensor 28 consists of a light barrier unit 28.1 and a mirror 28.2.
- a light source of the light barrier unit 28.1 emits light onto the mirror 28.2.
- the light reflected by the mirror 28.2 is then in turn detected by a light sensor of the light barrier unit 28.1. If there is a thread in the draw-off tube 18 in the area of the thread sensor 28, the light is blocked or at least weakened by the thread and the light sensor registers that there is a thread in the draw-off tube 18. Since the position of the thread sensor 28 in the draw-off tube 18 is known, the position of the thread end can even be registered if the point in time at which the thread blocks or releases the light is recorded. With the help of the detected position of the thread end, for example, the piecing process can then be carried out even more precisely.
- the draw-off tube 18 has a side arm 29.
- This side arm 29 leads to a thread preparation unit 30, which is shown only schematically here.
- a negative pressure is now applied to the side arm 29, the thread end reaches the thread end preparation unit 30 via the side arm 29, where the thread end is shortened and the rotation of the fibers is partially canceled.
- the thread end is now pulled back a little so that it is no longer in the side arm 29.
- a negative pressure is now applied in the main arm 31 of the draw-off tube 18 and continued as described above.
- FIG. 5 shows a side view of an embodiment of a thread exit element 19.
- This thread exit element 19 is provided with air guide elements 32. If compressed air is now blown between the thread outlet element 19 and the draw-off tube 18, an air vortex is generated in the compressed air flow by the air guide elements 32. With the help of this vortex a twist, usually a Z-twist, is generated in the thread or the twist is retained in the thread and does not dissolve.
- the air guiding elements 32 can also be assigned to the draw-off tube 18, or partially to the thread outlet element 19 and partially to the draw-off tube 18.
- FIGS 6a, 6b and 6c show cross sections of different thread guide units 6, the cross sections being in the region of the mouth 23.
- the mouth 23 is annular. This ensures an even flow of compressed air around the thread and is particularly gentle on the thread.
- Figure 6b shows a semicircular mouth 23.
- a mouth 23 is used in particular when, for example, a certain direction of the thread is predetermined by a kink 26 in the draw-off tube 18 and the compressed air flow is intended to guide the thread in this direction.
- FIG. 6c a mouth 23 in which a plurality of openings 33 are arranged along a ring, of which only two are provided with a reference symbol for the sake of clarity.
- Such a design of the mouth 23 offers increased stability of the thread guide unit 6 in the area of the mouth 23.
- Figure 7 a cross-section through a further thread guide unit 6.
- the compressed air nozzle 21 opens directly into the mouth 23.
- the compressed air nozzle 21 is offset from the axis of the draw-off tube 18 and the thread outlet element 19 and thus with a component tangential to the mouth 23.
- This offset arrangement of the compressed air nozzle 21 gives the blown air a tangential component, so that an air vortex is also generated here, with the advantages described above. It is also a combination of the tangential Compressed air nozzle with air guiding elements arranged at the mouth is conceivable, so that an air vortex of the correct strength is generated.
- FIG. 8 a cross section through a further thread guide unit 6.
- This thread guide unit 6 has an annular air chamber 22 in addition to the mouth 23.
- the compressed air nozzle 21 is similar to the embodiment of FIG Figure 7 , offset to the axis of the draw-off tube 18, the thread outlet element 19 and the annular air chamber 22 and thus has a component tangential to the mouth 23.
- the blown-in air receives a tangential component due to the offset arrangement of the compressed air nozzle 21. This also creates an air vortex, with the advantages described above.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Preliminary Treatment Of Fibers (AREA)
Description
Die vorliegende Erfindung betrifft eine Fadenführungseinheit zum Abziehen eines Fadens aus einem Rotor einer Spinnstelle einer Offenend-Spinnmaschine mit einem Abzugsrohr und einer Druckluftdüse.The present invention relates to a thread guide unit for pulling a thread from a rotor of a spinning station of an open-end spinning machine with a draw-off tube and a compressed air nozzle.
Ferner betrifft die Erfindung eine Offenend-Spinnmaschine mit einer Vielzahl an Spinnstellen, wobei jede Spinnstelle ein Spinnaggregat, eine Fadenführungseinheit, Abzugswalzen, eine Spuleinheit und eine Fadenansetzeinheit aufweist sowie ein Verfahren zum Betreiben einer Spinnstelle einer Offenend-Spinnmaschine, wobei ein Spinnaggregat einen Faden herstellt, der Faden von Abzugswalzen durch eine Fadenführungseinheit abgezogen wird und von einer Spuleinheit auf eine Spule aufgewickelt wird und dann, wenn der Faden angesetzt werden muss, eine Fadenansetzeinheit ein Fadenende zur Fadenführungseinheit bewegt, wo das Fadenende durch einen im Spinnaggregat herrschenden Unterdruck zunächst in die Fadenführungseinheit und dann in das Spinnaggregat eingesaugt wird.Furthermore, the invention relates to an open-end spinning machine with a plurality of spinning stations, each spinning station having a spinning unit, a thread guide unit, take-off rollers, a winding unit and a thread attachment unit, and a method for operating a spinning station of an open-end spinning machine, a spinning unit producing a thread, the thread is drawn off from take-off rollers by a thread guide unit and is wound onto a spool by a winding unit and then, when the thread has to be attached, a thread attachment unit moves a thread end to the thread guide unit, where the thread end is first introduced into the thread guide unit and by a negative pressure prevailing in the spinning unit is then sucked into the spinning unit.
Aus der deutschen Patentschrift
Zum Beheben eines Fadenbruches schlägt die
Aus der deutschen Patentschrift
Die deutsche Patentschrift
Aus der deutschen Patentschrift
Aufgabe der vorliegenden Erfindung ist es somit, die genannten Nachteile zu reduzieren und die Vorrichtung sowie das Verfahren weiter zu verbessern.The object of the present invention is therefore to reduce the disadvantages mentioned and to further improve the device and the method.
Die Aufgabe wird gelöst durch eine Fadenführungseinheit, eine Offenend-Spinnmaschine sowie ein Verfahren zum Betreiben einer Spinnstelle einer Offenend-Spinnmaschine mit den Merkmalen der unabhängigen Patentansprüche.The object is achieved by a thread guide unit, an open-end spinning machine and a method for operating a spinning station of an open-end spinning machine with the features of the independent claims.
Vorgeschlagen wird eine Fadenführungseinheit zum Abziehen eines Fadens aus einem Rotor einer Spinnstelle einer Offenend-Spinnmaschine mit einem Abzugsrohr und einer Druckluftdüse. Beim Spinnbetrieb wird also der aus dem Rotor kommende Faden durch das Abzugsrohr der Fadenführungseinheit abgezogen. In zeitlichen Abständen muss ein Fadenende wieder angesetzt werden, beispielsweise nach einem Fadenbruch oder einem Reinigerschnitt. Ein Reinigerschnitt ist dabei das absichtliche Trennen des Fadens, weil er nicht die gewünschten Eigenschaften, wie beispielsweise Dicke oder Reinheit, aufweist. Zum Ansetzen des Fadenendes muss es durch das Abzugsrohr der Fadenführungseinheit wieder in den Rotor gebracht werden. Diese Bewegung des Fadenendes wird dabei durch einen gerichteten Druckluftstrom, der aus der Druckluftdüse austritt, unterstützt.A thread guide unit is proposed for withdrawing a thread from a rotor of a spinning station of an open-end spinning machine with a draw-off tube and a compressed air nozzle. During the spinning operation, the thread coming from the rotor is drawn off through the draw-off tube of the thread guide unit. A thread end must be reattached at intervals, for example after a thread break or a cleaner cut. A cleaner cut is the deliberate cutting of the thread because it does not have the desired properties, such as thickness or purity. To attach the thread end, it must be brought back into the rotor through the draw-off tube of the thread guide unit. This movement of the thread end is supported by a directional compressed air flow that emerges from the compressed air nozzle.
Ein Fadenaustrittselement ist vorgesehen und eine Mündung der Druckluftdüse ist als Spalt zwischen dem Abzugsrohr und dem Fadenaustrittselement ausgebildet. Das Fadenaustrittselement ermöglicht dabei einen schonenden Austritt des Fadens aus der Fadenführungseinheit. Dies wird insbesondere durch eine abgerundete Form und/oder eine reibungsarme Oberfläche des Fadenaustrittselements erreicht. Dadurch, dass die Mündung der Druckluftdüse als Spalt zwischen dem Abzugsrohr und dem Fadenaustrittselement ausgebildet ist kann eine besonders kompakte Bauform erzielt werden.A thread outlet element is provided and an opening of the compressed air nozzle is designed as a gap between the draw-off tube and the thread outlet element. The thread exit element enables a gentle exit of the thread from the thread guide unit. This is particularly due to a rounded shape and / or a low-friction surface of the Thread exit element reached. Because the mouth of the compressed air nozzle is designed as a gap between the draw-off tube and the thread outlet element, a particularly compact design can be achieved.
Vorteilhafterweise ist die Mündung der Druckluftdüse ringförmig. So wird der Faden gleichmäßig umströmt, was sowohl die Druckluft am effektivsten ausnutzt als auch den Faden am schonendsten behandelt. Die Mündung der Druckluftdüse kann aber auch halbkreisförmig sein, was den Faden in Richtung einer Seite des Abzugsrohrs lenkt und insbesondere im Zusammenspiel mit einem nachfolgenden Knick im Abzugsrohr von Vorteil ist. Ferner kann es auch vorteilhaft sein, wenn die Mündung mehrere Öffnungen aufweist, die entlang eines Ringes angeordnet sind, wodurch sich eine erhöhte konstruktive Stabilität ergibt.The mouth of the compressed air nozzle is advantageously ring-shaped. The thread is evenly flowed around, which both uses the compressed air most effectively and treats the thread most gently. The mouth of the compressed air nozzle can also be semicircular, which directs the thread in the direction of one side of the draw-off tube and is particularly advantageous in combination with a subsequent kink in the draw-off tube. Furthermore, it can also be advantageous if the mouth has a plurality of openings which are arranged along a ring, which results in increased structural stability.
Im Bereich der Mündung sind Luftleitelemente vorgesehen. Diese Luftleitelemente dienen der Erzeugung eines Luftwirbels, der den Faden umströmt und damit einen Drall des Fadens - üblicherweise einen Z-Drall - erzeugt, verstärkt und/oder erhält. Die Luftleitelemente können dabei dem Abzugsrohr, dem Fadenaustrittselement oder beiden zugeordnet sein. Der Luftwirbel kann auch dadurch erzeugt werden, dass die Druckluftdüse mit einer zur Mündung tangentialen Komponente angeordnet ist. Dadurch wird die Druckluft schräg zur Mündung eingeblasen und erzeugt ebenfalls einen Luftwirbel.Air guiding elements are provided in the area of the mouth. These air guiding elements serve to generate an air vortex which flows around the thread and thus generates, amplifies and / or maintains a twist of the thread - usually a Z-twist. The air guide elements can be assigned to the draw-off tube, the thread outlet element or both. The air vortex can also be generated in that the compressed air nozzle is arranged with a component tangential to the mouth. As a result, the compressed air is blown in at an angle to the mouth and also creates an air vortex.
Es ist von Vorteil, wenn ein Druckluftanschluss, insbesondere eine Druckluftkupplung, zum Anschließen eines Druckluftschlauchs vorgesehen ist. Damit kann der Druckluftschlauch abnehmbar ausgebildet werden, was insbesondere für Wartungsarbeiten, bei denen beispielsweise der Druckluftschlauch oder die Fadenführungseinheit ausgetauscht werden müssen, günstig ist.It is advantageous if a compressed air connection, in particular a compressed air coupling, is provided for connecting a compressed air hose. The compressed air hose can thus be designed to be removable, which is particularly advantageous for maintenance work in which, for example, the compressed air hose or the thread guide unit has to be replaced.
Vorteilhaft ist es, wenn zwischen dem Abzugsrohr und dem Fadenaustrittselement eine insbesondere ringförmige Luftkammer ausgebildet ist. Die Luftkammer dient der Verteilung der Druckluft bevor sie die Mündung der Druckluftdüse erreicht. Dabei ist eine gleichmäßige Verteilung der Druckluft, wie sie durch eine ringförmige Luftkammer erzielt werden kann, am vorteilhaftesten.Vorteilhafterweise ist das Fadenaustrittselement mit dem Abzugsrohr durch Kleben, Schweißen, Schrauben und/oder Pressen verbunden. Das Fadenaustrittselement kann also separat vom Abzugsrohr hergestellt werden und wird dann mit einem der genannten Verfahren mit dem Abzugsrohr verbunden. Wenn die Verbindung trennbar ist, wie beispielsweise beim Schrauben oder beim Pressen, dann können Fadenaustrittselemente auch separat ausgetauscht werden, beispielsweise wenn sie verschlissen sind oder wenn die Fadenführungseinheit für eine andere Fadenart optimiert werden soll.It is advantageous if a particularly annular air chamber is formed between the draw-off tube and the thread outlet element. The air chamber serves to distribute the compressed air before it reaches the mouth of the compressed air nozzle reached. A uniform distribution of the compressed air, as can be achieved by an annular air chamber, is the most advantageous. Advantageously, the thread outlet element is connected to the draw-off tube by gluing, welding, screwing and / or pressing. The thread outlet element can thus be produced separately from the draw-off tube and is then connected to the draw-off tube using one of the methods mentioned. If the connection can be separated, for example when screwing or pressing, then thread outlet elements can also be replaced separately, for example if they are worn out or if the thread guide unit is to be optimized for another type of thread.
Von Vorteil ist es auch, wenn das Abzugsrohr eine Richtungsänderung, insbesondere in Form eines Knicks, aufweist, so dass die Richtung des Teils des Abzugsrohrs, an dem das Fadenaustrittselement angeordnet ist, einem Abzugswinkel des Fadens entspricht. In diesem Fall folgt eine Richtungsänderung des Fadens der Richtungsänderung des Abzugsrohrs. Die Richtungsänderung des Fadens kann somit kontrolliert werden. Eine sanfte Richtungsänderung des Abzugsrohrs hat also eine sanfte Richtungsänderung des Fadens zur Folge, was sich schonend auf den Faden auswirkt.It is also advantageous if the draw-off tube has a change in direction, in particular in the form of a kink, so that the direction of the part of the draw-off tube on which the thread outlet element is arranged corresponds to a draw-off angle of the thread. In this case, a change in direction of the thread follows the change in direction of the draw-off tube. The change in direction of the thread can thus be checked. A gentle change in the direction of the draw-off tube therefore results in a gentle change in the direction of the thread, which has a gentle effect on the thread.
Vorteilhaft ist es, wenn das Abzugsrohr ein Drallstoppmittel aufweist. Damit wird der vom Rotor erzeugte Drall im Faden gestoppt, so dass der Faden nur eine vorbestimmte Menge an Drall erhält und folglich vorbestimmte Eigenschaften aufweist. Ferner weist das Abzugsrohr vorteilhafterweise zumindest einen Fadensensor auf. Mit Hilfe eines solchen Fadensensors lässt sich zunächst feststellen, ob sich überhaupt ein Faden im Abzugsrohr befindet. Auch lassen sich Fadenbrüche frühzeitig detektieren. Insbesondere beim Ansetzvorgang lässt sich mittels des Fadensensors bestimmen, wann das Fadenende den Fadensensor passiert. Es ist also zumindest zu diesem Zeitpunkt die Position des Fadenendes bekannt. Für einen gespannten Faden, der beispielsweise auf der einen Seite von Abzugswalzen festgehalten und auf der anderen Seite durch die Druckluft gespannt wird, lässt sich dann die Position des Fadens aus der bekannten Anfangsposition und der Drehung der Abzugswalzen berechnen. Die Kenntnis der Position des Fadenendes ist beispielsweise für ein exaktes Ansetzen des Fadens notwendig. Je exakter der Faden angesetzt wird, desto größer ist auch die Wahrscheinlichkeit, dass er erfolgreich angesetzt wird, was wiederum die Produktivität der Spinnstelle erhöht.It is advantageous if the exhaust pipe has a swirl stopper. The twist generated by the rotor is thus stopped in the thread, so that the thread receives only a predetermined amount of twist and consequently has predetermined properties. Furthermore, the draw-off tube advantageously has at least one thread sensor. With the help of such a thread sensor, it can first be determined whether there is any thread in the draw-off tube. Thread breaks can also be detected at an early stage. In particular during the attachment process, the thread sensor can be used to determine when the thread end passes the thread sensor. The position of the thread end is known at least at this point in time. For a tensioned thread, which for example is held on one side by take-off rollers and tensioned on the other side by the compressed air, this can be done Calculate the position of the thread from the known starting position and the rotation of the take-off rollers. Knowing the position of the thread end is necessary, for example, for an exact placement of the thread. The more precisely the thread is applied, the greater the likelihood that it will be successfully applied, which in turn increases the productivity of the spinning station.
Von Vorteil ist es, wenn ein Befestigungsmittel zum Befestigen der Fadenführungseinheit an der Spinnstelle vorgesehen ist. Insbesondere bei einem trennbaren Befestigungsmittel lässt sich die Fadenführungseinheit somit leicht austauschen beziehungsweise für eine gründliche Reinigung abnehmen. Des Weiteren ist es vorteilhaft, wenn an der Fadenführungseinheit ein Unterdruckanschluss vorgesehen ist. Mit Hilfe eines Unterdruckanschlusses lässt sich beispielsweise zumindest ein Teil der von der Druckluftdüse gelieferten Druckluft wieder absaugen, was es der dem Rotor zugeordneten Unterdruckversorgung leichter macht, einen Unterdruck aufrecht zu halten. Des Weiteren können über den Unterdruckanschluss Faserflug, Schmutz und Fadenstücke abgesaugt werden, was die Sauberkeit der Fadenführungseinheit unterstützt.It is advantageous if a fastening means is provided for fastening the thread guide unit to the spinning station. In the case of a separable fastening means in particular, the thread guide unit can thus be easily replaced or removed for thorough cleaning. Furthermore, it is advantageous if a vacuum connection is provided on the thread guide unit. With the help of a vacuum connection, for example, at least some of the compressed air supplied by the compressed air nozzle can be sucked out again, which makes it easier for the vacuum supply assigned to the rotor to maintain a negative pressure. In addition, fiber fly, dirt and pieces of thread can be extracted via the vacuum connection, which supports the cleanliness of the thread guide unit.
Vorteilhafterweise weist das Abzugsrohr einen Innendurchmesser auf, der zwischen 2 mm und 4 mm, bevorzugt zwischen 2,5 mm und 3,5 mm und besonders bevorzugt etwa 3 mm beträgt. Dabei wird als Innendurchmesser der Innendurchmesser bezeichnet, den das Abzugsrohr überwiegend aufweist. Innendurchmesser mit den genannten Größen haben sich dabei als optimale Werte für den Abzug eines Fadens aus einem Spinnaggregat erwiesen. Vorteilhaft ist es auch, wenn der Spalt der Mündung eine Dicke aufweist, die zwischen 0,5 % und 15 %, bevorzugt zwischen 1,5 % und 8 % und besonders bevorzugt etwa 3,5 % des Innendurchmessers des Abzugsrohrs beträgt. Die Dicke ist dabei der Abstand zwischen dem Fadenaustrittselement und dem Abzugsrohr an der Mündung. Die genannte Werte ermöglichen dabei mit üblichen Drücken der Druckluft einen hinreichend starken Druckluftstrom und/oder hinreichend starke Luftwirbel.The exhaust pipe advantageously has an inner diameter which is between 2 mm and 4 mm, preferably between 2.5 mm and 3.5 mm and particularly preferably about 3 mm. The inner diameter is the inner diameter that the exhaust pipe predominantly has. Inner diameters with the sizes mentioned have proven to be optimal values for the withdrawal of a thread from a spinning unit. It is also advantageous if the gap of the mouth has a thickness which is between 0.5% and 15%, preferably between 1.5% and 8% and particularly preferably about 3.5% of the inside diameter of the exhaust pipe. The thickness is the distance between the thread outlet element and the draw-off tube at the mouth. The values mentioned allow with usual pressures of the compressed air a sufficiently strong compressed air flow and / or sufficiently strong air swirl.
Die Fadenführungseinheit ist gemäß der vorangegangenen Beschreibung ausgebildet, wobei die genannten Merkmale einzeln oder in beliebiger Kombination vorhanden sein können.The thread guide unit is designed in accordance with the preceding description, wherein the features mentioned can be present individually or in any combination.
Ferner wird eine Offenend-Spinnmaschine mit einer Vielzahl an Spinnstellen vorgeschlagen, wobei jede Spinnstelle ein Spinnaggregat, eine Fadenführungseinheit, Abzugswalzen, eine Spuleinheit und eine Fadenansetzeinheit aufweist. Im Spinnbetrieb kommt dabei der Faden aus dem Spinnaggregat und wird über die Fadenführungseinheit durch die Abzugswalzen abgezogen. Von den Abzugswalzen kommt der Faden dann zur Spuleinheit, die den Faden auf eine Spule, insbesondere eine Kreuzspule, aufspult.Furthermore, an open-end spinning machine with a plurality of spinning stations is proposed, each spinning station having a spinning unit, a thread guide unit, take-off rollers, a winding unit and a thread attachment unit. In spinning mode, the thread comes out of the spinning unit and is drawn off by the take-off rollers via the thread guide unit. The thread then comes from the take-off rollers to the winding unit, which winds the thread onto a bobbin, in particular a package.
Erfindungsgemäß ist die Fadenführungseinheit nach einem der vorherigen Ansprüche ausgebildet. Dabei verhilft die kompakte Bauform der Fadenführungseinheit auch der Offenend-Spinnmaschine zu einer kompakteren beziehungsweise effizienteren Bauform. Die oben genannten Vorteile bezüglich schonender Fadenbehandlung, besserer Wartbarkeit und erhöhter Produktivität sind natürlich auch für die Offenend-Spinnmaschine von Vorteil.According to the invention, the thread guide unit is designed according to one of the preceding claims. The compact design of the thread guide unit also helps the open-end spinning machine to achieve a more compact or more efficient design. The above-mentioned advantages with regard to gentle thread handling, better maintainability and increased productivity are of course also advantageous for the open-end spinning machine.
Schließlich wird ein Verfahren zum Betreiben einer Spinnstelle einer Offenend-Spinnmaschine vorgeschlagen. Dabei stellt ein Spinnaggregat einen Faden her. Der Faden wird von Abzugswalzen durch eine Fadenführungseinheit abgezogen und von einer Spuleinheit auf eine Spule, insbesondere eine Kreuzspule, aufgewickelt. Dann, wenn der Faden angesetzt werden muss, also beispielsweise nach einem Fadenbruch oder nach einem Reinigerschnitt, bewegt eine Fadenansetzeinheit ein Fadenende zur Fadenführungseinheit. Dort wird das Fadenende durch einen im Spinnaggregat herrschenden Unterdruck zunächst in die Fadenführungseinheit und dann in das Spinnaggregat eingesaugt.Finally, a method for operating a spinning station of an open-end spinning machine is proposed. A spinning unit produces a thread. The thread is drawn off from take-off rollers by a thread guide unit and wound up from a winding unit onto a bobbin, in particular a package. When the thread has to be attached, for example after a thread break or after a cleaner cut, a thread application unit moves a thread end to the thread guide unit. There, the thread end is sucked into the thread guide unit and then into the spinning unit by a negative pressure prevailing in the spinning unit.
Ein Druckluftstrom, der insbesondere aus einer Druckluftdüse der Fadenführungseinheit austritt, unterstützt den im Spinnaggregat herrschenden Unterdruck und damit das Einsaugen des Fadenendes in das Spinnaggregat, zeitlich abgestimmt mit dem Ansetzen des Fadens. Durch den unterstützenden Druckluftstrom findet das Ansetzen des Fadens schneller und präziser statt als nur mit dem im Spinnaggregat herrschenden Unterdruck.A compressed air flow, which emerges in particular from a compressed air nozzle of the thread guide unit, supports the negative pressure prevailing in the spinning unit and thus the sucking in of the end of the thread into the spinning unit, timed with the thread being attached. Thanks to the supportive compressed air flow, the thread is attached faster and more precisely than with the negative pressure prevailing in the spinning unit.
Erfindungsgemäß ist die Fadenführungseinheit wie oben beschrieben ausgebildet. Damit kann der Faden schonender behandelt, die Spinnstelle einfacher und besser gewartet und die Produktivität erhöht werden.According to the thread guide unit is designed as described above. This means that the thread can be treated more gently, the spinning position can be maintained more easily and better, and productivity can be increased.
Der Druckluftstrom erzeugt einen Luftwirbel. Dies kann beispielsweise durch Luftleitelemente im Bereich einer Mündung der Druckluftdüse erreicht werden. Vorzugsweise erzeugt und/oder verstärkt dieser Luftwirbel einen Drall, insbesondere einen Z-Drall, im Faden. So wird vermieden, dass der Faden seinen Drall verliert und sich möglicherweise auflöst. Wird durch den Luftwirbel der Faden sogar mit zusätzlichen Drehungen beaufschlagt, dann verfestigt dies den Faden im Anspinnbereich und verbessert die Effektivität des Anspinnprozesses. Der Druckluftstrom kann aber auch während des Abziehens des gesponnen Fadens durch das Abzugsrohr durch die Druckluftdüse geblasen werden und einen Luftwirbel erzeugen. Durch den Luftwirbel wird ein Falschdrall im Faden verursacht, der in bekannter Weise zu einem gekräuselten Faden führt.The compressed air flow creates an air vortex. This can be achieved, for example, by air guiding elements in the area of a mouth of the compressed air nozzle. This air vortex preferably generates and / or amplifies a twist, in particular a Z twist, in the thread. This prevents the thread from losing its twist and possibly becoming loose. If the thread is even subjected to additional twists due to the air vortex, this solidifies the thread in the piecing area and improves the effectiveness of the piecing process. However, the compressed air flow can also be blown through the draw-off tube through the compressed air nozzle while the spun thread is being drawn off and produce an air vortex. The air vortex causes a false twist in the thread, which leads to a curled thread in a known manner.
Von Vorteil ist es, wenn ein weiterer Druckluftstrom, der insbesondere aus der Druckluftdüse der Fadenführungseinheit austritt, das Einsaugen des Fadenendes in die Fadenführungseinheit unterstützt. Auch das Einsaugen des Fadenendes in die Fadenführungseinheit kann damit schneller und präziser erfolgen. Darüber hinaus kann die stärkere Luftströmung auch ein nicht exakt positioniertes Fadenende erfassen, was die Wahrscheinlichkeit, dass der Ansetzvorgang erfolgreich ist, und damit auch die Produktivität der Spinnstelle erhöht.It is advantageous if a further stream of compressed air, which emerges in particular from the compressed air nozzle of the thread guide unit, supports the sucking in of the thread end into the thread guide unit. The thread end can also be sucked into the thread guide unit faster and more precisely. In addition, the stronger air flow can also detect a thread end that is not positioned exactly, which increases the likelihood that the Attaching process is successful, and thus also increases the productivity of the spinning station.
Es ist auch vorteilhaft, wenn das Fadenende, nachdem es in die Fadenführungseinheit und in das Spinnaggregat eingesaugt wurde, am Rand eines Rotors des Spinnaggregats präpariert wird. Die Präparierung am Rand des Rotors bewirkt zum einen, dass der Faden auf eine vorbestimmte Länge gekürzt wird. Zum anderen werden die Fasern am Fadenende teilweise von ihrer Drehung befreit, so dass sich die neuen Fasern leichter mit dem Fadenende verbinden. Insgesamt bringt die Präparation des Fadenendes am Rand des Rotors den Vorteil, dass sowohl das Kürzen des Fadens als auch Befreien von der Drehung der Fasern mit Hilfe von bereits an der Spinnstelle vorhandenen Einrichtungen erfolgt. Der Rotor erledigt so also zwei oder drei verschiedene Aufgaben. Vorzugsweise wird während des Einsaugens und/oder Präparierens des Fadens ein Druckluftstrom durch die Druckluftdüse geblasen. Durch den Druckluftstrom wird dabei eine höhere Zugkraft des Fadens erzielt und damit der Faden auch stärker gestrafft. Ohne zusätzlichen Druckluftstrom müsste der Faden, um die für die Präparation des Fadenendes erforderliche Zugkraft zu erhalten, weit in einen Hauptunterdruckkanal eingesaugt werden, was vielfältige Nachteile mit sich bringt: Wenn mehrere benachbarte Spinnstellen gleichzeitig angesponnen werden, besteht die Gefahr, dass sich Fadenzöpfe im Hauptunterdruckkanal bilden. Durch den meist nicht konstanten Unterdruck im Hauptunterdruckkanal über die Länge der Offenend-Spinnmaschine ergeben sich überdies unterschiedliche Fadenzugkräfte je nach Lage der Spinnstelle. Des Weiteren fällt das gesamte sich im Hauptunterdruckkanal befindliche Fadenstück als Abfall an. Mit Hilfe des Druckluftstroms wird die die erforderliche Fadenzugkraft idealerweise schon erreicht, wenn sich das Fadenende noch gar nicht im Hauptunterdruckkanal befindet. Dadurch werden die genannten Nachteile behoben oder zumindest verringert. Vorteilhafterweise wird das Fadenende, nachdem es am Rand des Rotors präpariert wurde, zurückgezogen. Durch diesen Schritt wird die Positionierung des Fadenendes im Rotor verbessert und der Rotor kann beschleunigt werden ohne dass das Fadenende mitgedreht wird.It is also advantageous if the thread end, after it has been sucked into the thread guide unit and into the spinning unit, is prepared on the edge of a rotor of the spinning unit. The preparation on the edge of the rotor on the one hand causes the thread to be shortened to a predetermined length. On the other hand, the fibers at the end of the thread are partially freed from their rotation, so that the new fibers connect more easily to the end of the thread. Overall, the preparation of the thread end at the edge of the rotor has the advantage that both the shortening of the thread and the removal of the rotation of the fibers is carried out with the aid of devices already present at the spinning position. So the rotor does two or three different jobs. A compressed air stream is preferably blown through the compressed air nozzle during the suctioning and / or preparation of the thread. Due to the compressed air flow, a higher tensile force of the thread is achieved and the thread is thus tightened more. Without additional compressed air flow, the thread would have to be sucked far into a main vacuum duct in order to obtain the tensile force required for the preparation of the thread end, which has many disadvantages: If several adjacent spinning positions are spun at the same time, there is a risk that thread braids in the main vacuum duct form. The mostly non-constant negative pressure in the main negative pressure channel over the length of the open-end spinning machine also results in different thread tensile forces depending on the position of the spinning station. Furthermore, the entire piece of thread located in the main negative pressure duct is produced as waste. With the help of the compressed air flow, the required thread tension is ideally achieved when the thread end is not yet in the main vacuum channel. This eliminates or at least reduces the disadvantages mentioned. The thread end is advantageously withdrawn after it has been prepared on the edge of the rotor. Through this step the Positioning of the thread end in the rotor is improved and the rotor can be accelerated without the thread end also being rotated.
Ebenso ist es vorteilhaft, wenn das Fadenende außerhalb der Fadenführungseinheit von Hand präpariert wird. Geschultes Bedienpersonal kann dabei ein sehr gut präpariertes Fadenende herstellen, bei dem die Drehung der Fasern im richtigen Maß aufgehoben ist. Darüber hinaus wird der Faden bei der Präparation des Fadenendes von Hand nur wenig gekürzt und es fällt kaum Abfall an. Des Weiteren ist es von Vorteil, wenn das Fadenende in einem Fadenendepräparationsaggregat präpariert wird. Ein solches Fadenendepräparationsaggregat ermöglicht ebenfalls eine optimale Präparation des Fadenendes bei vergleichsweise geringem Abfallaufkommen. Das Fadenendepräparationsaggregat kann dabei einer fahrbaren Wartungseinheit zugeordnet sein, die zum Ansetzen des Fadens zur Spinnstelle gefahren wird. Das Fadenendepräparationsaggregat kann auch der Spinnstelle zugeordnet sein, wobei es entweder ein separates Bauteil ist oder sich vorzugsweise in einem Seitenarm des Abzugsrohrs befindet. Ist das Fadenendepräparationsaggregat im Seitenarm des Abzugsrohrs angeordnet, dann lässt sich der Fadenansetzvorgang besonders schnell durchführen, weil der Faden sich dann schon im Abzugsrohr befindet und nicht mehr extra in das Abzugsrohr eingeführt werden muss.It is also advantageous if the thread end is prepared by hand outside the thread guide unit. Trained operating personnel can produce a very well-prepared thread end in which the rotation of the fibers is canceled to the correct extent. In addition, the thread is only slightly shortened by hand when preparing the thread end and there is hardly any waste. Furthermore, it is advantageous if the thread end is prepared in a thread end preparation unit. Such a thread end preparation unit also enables optimal preparation of the thread end with a comparatively low amount of waste. The thread end preparation unit can be assigned to a mobile maintenance unit which is moved to the spinning station for attaching the thread. The thread end preparation unit can also be assigned to the spinning station, wherein it is either a separate component or is preferably located in a side arm of the draw-off tube. If the thread end preparation unit is arranged in the side arm of the draw-off tube, the thread-setting process can be carried out particularly quickly because the thread is then already in the draw-off tube and no longer has to be inserted into the draw-off tube.
Von Vorteil ist es auch, wenn das Einsaugen des Fadenendes in das Spinnaggregat, insbesondere nachdem das Fadenende zurückgezogen wurde, durch die Drehung eines reversiblen Schrittmotors und/oder durch das Auflösen einer Schlaufe ermöglicht wird. Durch die Drehung eines reversiblen Schrittmotors kann das Fadenende eine vorbestimmte Strecke in das Spinnaggregat befördert werden. Ebenso wird das Fadenende durch das Auflösen einer Schlaufe eine vorbestimmte Strecke in das Spinnaggregat befördert, vorausgesetzt die Schlaufe hatte eine vorbestimmte Länge. Das Fadenende wird beim Ansetzvorgang also kontrolliert bewegt, was zu reproduzierbaren Ergebnissen führt. Dies ist sowohl für die Qualität der Verbindung des Fadenendes mit dem neu gesponnenen Faden als auch für die Zuverlässigkeit des Ansetzvorgangs von Vorteil.It is also advantageous if the threading of the thread end into the spinning unit, in particular after the thread end has been withdrawn, is made possible by the rotation of a reversible stepping motor and / or by the loosening of a loop. By rotating a reversible stepper motor, the thread end can be conveyed into the spinning unit for a predetermined distance. Likewise, the thread end is transported through the loosening of a loop a predetermined distance into the spinning unit, provided the loop had a predetermined length. The thread end is moved in a controlled manner during the piecing process, which leads to reproducible results. This is both for the quality of the connection of the thread end with the newly spun thread as well as for the reliability of the piecing process.
Zusammengefasst kann ein Ansetzvorgang also wie folgt ablaufen: Das Fadenende wird von einer Fadenansetzeinheit zur Fadenführungseinheit bewegt. Eine der Spinnstelle zugeordnete Spinnbox bzw. das Spinnaggregat wird geschlossen und das Fadenende wird in die Fadenführungseinheit eingesaugt. Die Spinnbox wird nun geöffnet und der Faden wird abgespult, so dass das Fadenende in eine Absaugeinrichtung der Spinnbox bzw. des Spinnaggregats gefördert wird. Sodann wird die Spinnbox fast, aber nicht vollständig, geschlossen, wodurch der Faden an den Rand des Rotors gedrückt wird. Der Rotor wird nun beschleunigt und der Faden wird mehrmals vor- und zurückgezogen, wodurch der Faden am Rotorrand getrennt und präpariert wird. Danach wird der Faden aus dem Rotor zurückgezogen, aber nur so weit, dass er sich noch in der Fadenführungseinheit befindet. Nach dem Schließen des Spinnaggregats wird der Faden zum Ansetzen wieder in den Rotor gefördert.In summary, a piecing process can thus proceed as follows: The thread end is moved by a thread piecing unit to the thread guide unit. A spinning box or the spinning unit assigned to the spinning station is closed and the end of the thread is sucked into the thread guide unit. The spinning box is now opened and the thread is unwound so that the thread end is conveyed into a suction device of the spinning box or of the spinning unit. The spinning box is then closed almost, but not completely, whereby the thread is pressed against the edge of the rotor. The rotor is now accelerated and the thread is pulled back and forth several times, whereby the thread is separated and prepared at the rotor edge. The thread is then withdrawn from the rotor, but only so far that it is still in the thread guide unit. After the spinning unit has been closed, the thread is fed back into the rotor for attachment.
Des Weiteren ist es vorteilhaft, wenn mittels zumindest eines Sensors in einem der Fadenführungseinheit zugeordneten Abzugsrohr die Position des Fadenendes erfasst wird. Durch die bekannte Position des Fadenendes kann der Ansetzvorgang noch präziser gesteuert werden, beispielsweise durch die Länge der Fadenrückführung, oder durch die Wahl der Zeitpunkte des Hochfahrens des Rotors oder des Beginns des Abziehens des Fadens. Vorzugsweise wird der Druckluftstrom unter Berücksichtigung der Position des Fadenendes gesteuert. Durch den Druckluftstrom kann das Ansetzen des Fadenendes ebenfalls beeinflusst werden. Dabei kann sowohl der Zeitpunkt als auch die Dauer und gegebenenfalls sogar die Stärke des Druckluftstroms beeinflusst werden.Furthermore, it is advantageous if the position of the thread end is detected by means of at least one sensor in a draw-off tube assigned to the thread guide unit. The known position of the thread end allows the piecing process to be controlled even more precisely, for example by the length of the thread return, or by the choice of the times for the rotor to start up or the start of the thread withdrawal. The compressed air flow is preferably controlled taking into account the position of the thread end. The attachment of the thread end can also be influenced by the compressed air flow. Both the time and the duration and possibly even the strength of the compressed air flow can be influenced.
Schließlich ist es von Vorteil, wenn zum Reinigen der Fadenführungseinheit und/oder des Spinnaggregats in zeitlichen Abständen ein Druckluftstrom durch die Druckluftdüse geblasen wird. Eine Reinigung mittels Druckluft ist dabei effizient und mit den vorhandenen Mitteln durchführbar. Aufwändigere, beispielsweise mechanische, Reinigungen können somit mit längeren zeitlichen Abständen voneinander durchgeführt werden. Die Reinigung mit dem durch die Druckluftdüse geblasenen Druckluftstrom lässt sich hingegen vor jedem Ansetzvorgang und sogar während des laufenden Spinnbetriebs durchführen.Finally, it is advantageous if a compressed air stream is used at intervals to clean the thread guide unit and / or the spinning unit is blown through the compressed air nozzle. Cleaning with compressed air is efficient and can be carried out with the available means. More complex, for example mechanical, cleaning can thus be carried out at longer time intervals from one another. However, cleaning with the compressed air stream blown through the compressed air nozzle can be carried out before each attachment process and even while the spinning operation is running.
Das Verfahren zum Betreiben einer Spinnstelle wird gemäß der vorangegangenen Beschreibung durchgeführt, wobei die genannten Merkmale einzeln oder in beliebiger Kombination vorhanden sein können.The method for operating a spinning station is carried out according to the preceding description, wherein the features mentioned can be present individually or in any combination.
Weitere Vorteile der Erfindung sind in den nachfolgenden Ausführungsbeispielen beschrieben. Es zeigen:
- Figuren 1a, 1b und 1c
- schematische Seitenansichten einer Spinnstelle einer Offenend-Spinnmaschine,
-
Figur 2 - einen Längsschnitt einer Fadenführungseinheit,
-
Figur 3 - einen Längsschnittschnitt einer weiteren Fadenführungseinheit,
-
Figur 4 - einen Längsschnitt einer weiteren Fadenführungseinheit,
-
Figur 5 - eine Seitenansicht eines Fadenaustrittselements,
- Figuren 6a, 6b und 6c
- Querschnitte durch verschiedene Fadenführungseinheiten und
-
Figur 7 - einen Querschnitt durch eine weitere Fadenführungseinheit und
-
Figur 8 - einen Querschnitt durch eine weitere Fadenführungseinheit.
- Figures 1a, 1 b and 1c
- schematic side views of a spinning station of an open-end spinning machine,
- Figure 2
- a longitudinal section of a thread guide unit,
- Figure 3
- a longitudinal section of a further thread guide unit,
- Figure 4
- a longitudinal section of a further thread guide unit,
- Figure 5
- a side view of a thread exit element,
- Figures 6a, 6b and 6c
- Cross sections through different thread guide units and
- Figure 7
- a cross section through a further thread guide unit and
- Figure 8
- a cross section through a further thread guide unit.
In zeitlichen Abständen wird zum Reinigen der Fadenführungseinheit 6 und des Spinnaggregats 3 ein Druckluftstrom durch eine Druckluftdüse 13 der Fadenführungseinheit 6 geblasen. Schmutz und Faserflug werden dadurch gelöst und von einer hier nicht gezeigten Unterdruckeinrichtung des Spinnaggregats 3 abgesaugt. Im Spinnbetrieb nicht benötigt werden eine von einem Motor 14 verschiebbare Saugdüse 15 sowie ein Fadenfänger 16.At intervals, a stream of compressed air is blown through a
Nach einem Fadenbruch oder einem Reinigerschnitt läuft der Faden 4 auf die Kreuzspule 10 auf. Um auf der Kreuzspule 10 einen durchgängigen Faden 4 zu erhalten, muss zunächst das Fadenende 17 gefunden und sodann an das Spinnaggregat 3 angesetzt werden. Zum Suchen des Fadenendes 17 wird die Saugdüse 15 so von dem Motor 14 verschoben, dass sich die Öffnung der Saugdüse 15 knapp über der Oberfläche der Kreuzspule 10 befindet. Die Kreuzspule 10 wird dann von der Antriebswalze 12 langsam entgegen der Drehrichtung beim Spinnbetrieb gedreht bis das Fadenende 17 in die Saugdüse 15 eingesaugt wird. Dann wird die Saugdüse 15 vom Motor 14 wieder von der Kreuzspule 10 entfernt, so dass sich der Faden 4 zwischen der Kreuzspule 10 und der Saugdüse 15 aufspannt. Der Fadenfänger 16 kann dann den aufgespannten Faden 4 greifen. Dieser Zeitpunkt ist in
Der Faden 4 wird dann vom Fadenfänger 16 in die Changiereinheit 9 und das Abzugswalzenpaar 5 eingelegt und bis zur Öffnung der Fadenführungseinheit 6 bewegt. Dort wird der Faden 4 vom im Spinnaggregat 3 herrschenden Unterdruck in die Fadenführungseinheit 6 eingesaugt. Dieser Vorgang wird von einem durch die Druckluftdüse 13 geblasenen Druckluftstrom unterstützt. Das Fadenende 17 befindet sich nun in der Fadenführungseinheit 6, wie in
Im weiteren Verlauf des Ansetzvorgangs wird dann das Abzugswalzenpaar 5 rückwärts gedreht, so dass das Fadenende 17 vom im Spinnaggregat 3 herrschenden Unterdruck, unterstützt durch den Druckluftstrom aus der Druckluftdüse 13, weiter in die Fadenführungseinheit 6 bis zum Rotor 2 bewegt wird. Am drehenden Rotorrand wird das Fadenende 17 dann abgetrennt und präpariert. Daraufhin wird das Fadenende 17 vom Abzugswalzenpaar 5 wieder etwas zurückgezogen. Sodann findet das eigentliche Ansetzen statt, bei dem der Rotor 2 auf seine Ansetzgeschwindigkeit hochgefahren wird und das Abzugswalzenpaar 5 wieder rückwärts gedreht wird. Das Fadenende 17 wird dabei durch den im Spinnaggregat 3 herrschenden Unterdruck, kombiniert mit einem zeitlich abgestimmten Druckluftstrom aus der Druckluftdüse 13, in den Rotor 2 befördert, wo es sich mit dort befindlichen Fasern verbindet. Sodann wird der normale Spinnbetrieb wieder aufgenommen.In the further course of the piecing process, the draw-off
Im Spinnbetrieb wird ein Faden aus dem Rotor von einem Abzugswalzenpaar durch das Abzugsrohr 18 abgezogen. Der Faden verlässt die Fadenführungseinheit 6 am Fadenaustrittselement 19. Die Druckluftdüse 21 wird, wie oben beschrieben, benötigt, um den Faden in Richtung des Rotors zu blasen. Außerdem kann ein durch die Druckluftdüse 21 geblasener Druckluftstrom zum Reinigen des Abzugsrohrs und/oder des Spinnaggregats verwendet werden.In the spinning mode, a thread is drawn out of the rotor by a pair of draw-off rollers through the draw-off
Bei der nachfolgenden Beschreibung der in
Zum schnelleren Anschließen und Trennen eines Druckluftschlauchs weist die Fadenführungseinheit 6 eine Druckluftkupplung 24 auf. Dies bringt insbesondere bei Wartungs- und/oder Reinigungsarbeiten einen Zeitvorteil gegenüber einem herkömmlichen Druckluftanschluss.The
Des Weiteren weist die Fadenführungseinheit 6 einen, ebenfalls als Luftkupplung ausgebildeten, Unterdruckanschluss 25 auf. Unterdruck wird beispielsweise dann über den Unterdruckanschluss 25 eingeschaltet, wenn ein Fadenende erstmals in die Fadenführungseinheit 6 eingesaugt wird. Dann unterstützt dieser Unterdruck den im Spinnaggregat herrschenden Unterdruck und saugt zumindest einen Teil der von der Druckluftdüse 21 eingeblasenen Druckluft wieder ab. Der Unterdruck wird überdies eingeschaltet, wenn das Abzugsrohr 18 mit Hilfe von Druckluft gereinigt wird. Dann werden Schmutz und Faserflug über die Unterdruckleitung abgesaugt.Furthermore, the
Die Fadenführungseinheit 6 umfasst ferner eine Nut 7. Im Zusammenwirken mit Haltefedern des Spinnaggregats dient diese Nut 7 dazu, die Fadenführungseinheit 6 am Spinnaggregat zu befestigen.The
Das Abzugsrohr 18 weist einen Knick 26 auf, so dass der Faden zumindest im Wesentlichen in Richtung des Teils des Abzugsrohrs 18, an dem das Fadenaustrittselement 19 angeordnet ist, abgezogen wird. So ist die Richtungsänderung des Fadens am Fadenaustrittselement 19 sehr gering, was eine dementsprechend geringe Reibung des Fadens am Fadenaustrittselement 19 zur Folge hat.The draw-off
Ferner weist das Abzugsrohr 18 Drallstoppmittel 27 auf. Dadurch wird der von der Drehung des Rotors erzeugte Drall im Faden gestoppt, was einen definierten Drall im Faden und damit gleichbleibende Fadeneigenschaften zur Folge hat.The
Schließlich ist ein Fadensensor 28 im Abzugsrohr 18 vorgesehen. Der Fadensensor 28 besteht aus einer Lichtschrankeneinheit 28.1 und einem Spiegel 28.2. Eine Lichtquelle der Lichtschrankeneinheit 28.1 strahlt dabei Licht auf den Spiegel 28.2. Das vom Spiegel 28.2 reflektierte Licht wird dann wiederum von einem Lichtsensor der Lichtschrankeneinheit 28.1 detektiert. Befindet sich im Bereich des Fadensensors 28 ein Faden im Abzugsrohr 18, so wird das Licht vom Faden blockiert oder zumindest abgeschwächt und der Lichtsensor registriert, dass sich ein Faden im Abzugsrohr 18 befindet. Da die Position des Fadensensors 28 im Abzugsrohr 18 bekannt ist, kann sogar die Position des Fadenendes registriert werden, wenn der Zeitpunkt festgehalten wird, zu dem der Faden das Licht blockiert beziehungsweise wieder freigibt. Mit Hilfe der erfassten Position des Fadenendes kann dann beispielsweise der Ansetzvorgang noch präziser durchgeführt werden.Finally, a thread sensor 28 is provided in the draw-off
Bei der in
Die
In
Ferner zeigt
Des Weiteren zeigt
Schließlich zeigt
Ferner ist auch eine Kombination der Ausführungsbeispiele der
Die vorliegende Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt. Abwandlungen im Rahmen der Patentansprüche sind ebenso möglich wie eine Kombination der Merkmale, auch wenn diese in unterschiedlichen Ausführungsbeispielen dargestellt und beschrieben sind.The present invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the claims are possible as well as a combination of the features, even if these are shown and described in different exemplary embodiments.
- 11
- Spinnstellespinning unit
- 22
- Rotorrotor
- 33
- Spinnaggregatspinning unit
- 44
- Fadenthread
- 55
- AbzugswalzenpaarOff rollers
- 66
- FadenführungseinheitThread guiding unit
- 77
- Nutgroove
- 88th
- Haltefederretaining spring
- 99
- ChangiereinheitTraversing unit
- 1010
- Kreuzspulecheese
- 1111
- Spulenhalterspool holder
- 1212
- Antriebswalzedrive roller
- 1313
- Druckluftdüsecompressed air nozzle
- 1414
- Motorengine
- 1515
- Saugdüsesuction nozzle
- 1616
- Fadenfängerthread catcher
- 1717
- Fadenendethread end
- 1818
- Abzugsrohrexhaust pipe
- 1919
- FadenaustrittselementThread exit element
- 2020
- DruckluftanschlussCompressed air connection
- 2121
- Druckluftdüsecompressed air nozzle
- 2222
- Ringförmige LuftkammerAnnular air chamber
- 2323
- Mündungmuzzle
- 2424
- DruckluftkupplungCompressed air coupling
- 2525
- UnterdruckanschlussVacuum port
- 2626
- Knickkink
- 2727
- DrallstoppmittelTwist stop means
- 2828
- Fadensensorthread sensor
- 2929
- Seitenarmsidearm
- 3030
- FadenendepräparationsaggregatYarn end preparation unit
- 3131
- Hauptarmmain arm
- 3232
- Luftleitelementair guide
- 3333
- Öffnungopening
- DD
- InnendurchmesserInner diameter
- TT
- Dickethickness
Claims (17)
- Thread guide unit for drawing off a thread (4) out of a rotor (2) of a spinning position (1) of an open-end spinning machine with a draw-off tube (18) and a compressed air nozzle (21),
wherein
a thread outlet element (19) is provided and a mouth (23) of the compressed air nozzle (21) is formed as a gap between the draw-off tube (18) and the thread outlet element (19), characterized in that the compressed air nozzle (21) is arranged with a component that is tangential to the mouth (23) and/or air directing elements (32) are provided in the area of the mouth (23) for generating an air vortex, whereas the air directing elements (32) can be assigned to the draw-off tube (18) and/or the thread outlet element (19). - Thread guide unit according to the preceding claim, characterized in that the mouth (23) of the compressed air nozzle (21) is ring-shaped and/or semi-circular and features a multiple number of openings (33) arranged along a ring.
- Thread guide unit according to one of the preceding claims, characterized in that a compressed air connection (20; 24), in particular a compressed air coupling (24), is provided for connecting a compressed air hose.
- Thread guide unit according to one of the preceding claims, characterized in that a particularly ring-shaped air chamber (22) is formed between the draw-off tube (18) and the thread outlet element (19) and/or the thread outlet element (19) is connected to the draw-off tube (18) by gluing, welding, screwing and/or pressing.
- Thread guide unit according to one of the preceding claims, characterized in that the draw-off tube (18) features a change in direction, in particular in the form of a bend (26), such that the direction of the part of the draw-off tube (18) on which the thread outlet element (19) is arranged corresponds to the draw-off angle of the thread (4).
- Thread guide unit according to one of the preceding claims, characterized in that the draw-off tube (18) features a twist stop means (27) and/or at least one thread sensor (28).
- Thread guide unit according to one of the preceding claims, characterized in that a fastening means (7) is provided for fastening the thread guide unit (6) to the spinning position (1) and/or a negative pressure connection (25) is provided on the thread guide unit (6).
- Thread guide unit according to one of the preceding claims, characterized in that the draw-off tube (18) features an internal diameter (D) that is between 2 mm and 4 mm, preferably between 2.5 mm and 3.5 mm and in particular preferably approximately 3 mm, and/or the gap of the mouth (23) features a thickness (T) that is between 0.5% and 15%, preferably between 1.5% and 8%, and in particular preferably approximately 3.5%, of the inner diameter (D) of the draw-off tube (18).
- Open-end spinning machine with a multiple number of spinning positions (1), wherein each spinning position (1) features a spinning aggregate (3), a thread guide unit (6), draw-off rollers (5), a winding unit (9, 11) and a thread piecing unit (15, 14, 16),
characterized in that the thread guide unit (6) is formed according to one of the preceding claims. - Method for operating a spinning position (1) of an open-end spinning machine, wherein a spinning aggregate (3) produces a thread (4), the thread (4) is drawn-off through a thread guide unit (6) by draw-off rollers (5) and is wound by a winding unit (9, 11) onto a bobbin (10), and, if the thread (4) has to be pieced, a thread piecing unit (15, 14, 16) moves a thread end (17) to the thread guide unit (6), where the thread end (17) is initially fed into the thread guide unit (6) by a negative pressure prevailing in the spinning aggregate (3) and is then sucked into the spinning aggregate (3).
wherein
a compressed air flow, which emerges in particular from a compressed air nozzle (21) of the thread guide unit (6) supports the sucking-in of the thread end (17) into the spinning aggregate (3), in a manner synchronized with the piecing of the thread (4) characterized in that
the thread guide unit (6) is designed according to one of the claims 1 to 6 and the compressed air flow generates an air vortex, which preferably generates and/or amplifies a twist, in particular a Z-twist, in the thread (4), and/or causes a false twist in the thread (4) during the drawing-off of the spun thread (4) through the draw-off tube (18).. - Method according to the preceding claim, characterized in that the twist in the thread (4) is a Z-twist.
- Method according to claim 10 or 11, characterized in that an additional compressed air flow, which emerges in particular from the compressed air nozzle (21) of the thread guide unit (6), supports the sucking-in of the thread end (17) into the thread guide unit (6).
- Method according to one of the claims 10 to 12, characterized in that the thread end (17), after it has been sucked into the thread guide unit (6) and into the spinning aggregate (3), is prepared at the edge of a rotor (2) of the spinning aggregate (3) and, preferably, a compressed air flow is blown through the compressed air nozzle (21) during the sucking-in and/or preparation of the thread and/or the thread end (17) is withdrawn after it has been prepared at the edge of the rotor (2).
- Method according to one of the claims 10 to 13, characterized in that the thread end (17) is prepared by hand outside the thread guide unit (6) and/or is prepared in a thread end preparation aggregate (30), wherein the thread end preparation aggregate (30) is assigned to a mobile maintenance unit of the open-end spinning machine and/or is assigned to the spinning position (1) and is preferably located in a side arm (29) of the draw-off tube (18).
- Method according to one of the claims 10 to 14, characterized in that the sucking-in of the thread end (17) into the spinning aggregate (3), in particular after the thread end (17) has been withdrawn, is made possible by the rotation of a reversible stepping motor and/or by the loosening of a loop, whereby the thread end (17) is conveyed a predetermined distance into the spinning aggregate (3).
- Method according to one of the claims 10 to 15, characterized in that the position of the thread end (17) is detected by means of at least one sensor (28) in a draw-off tube (18) assigned to the thread guide unit (6), and, preferably, the compressed air flow is controlled taking into account the position of the thread end (17).
- Method according to one of the claims 10 to 16, characterized in that a compressed air flow is blown through the compressed air nozzle (21) at time intervals for cleaning the thread guide unit (6) and/or the spinning aggregate (3).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102016113963 | 2016-07-28 |
Publications (2)
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EP3276057A1 EP3276057A1 (en) | 2018-01-31 |
EP3276057B1 true EP3276057B1 (en) | 2020-01-01 |
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Family Applications (1)
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EP17183275.1A Active EP3276057B1 (en) | 2016-07-28 | 2017-07-26 | Thread guide unit, open-end spinning machine and method for operating a spinning station |
Country Status (4)
Country | Link |
---|---|
US (1) | US10689779B2 (en) |
EP (1) | EP3276057B1 (en) |
CN (1) | CN107663683B (en) |
DE (1) | DE102017116893A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109097875A (en) * | 2018-08-31 | 2018-12-28 | 安徽日发纺织机械有限公司 | A kind of rotor spinning machine automatic joint method |
DE102020101840A1 (en) | 2020-01-27 | 2021-07-29 | Maschinenfabrik Rieter Ag | Thread guide unit, open-end rotor spinning machine and method for operating a spinning station |
EP4015682A1 (en) * | 2020-12-18 | 2022-06-22 | Saurer Intelligent Technology AG | Work station of an air spinning machine and yarn guide element |
CN115467056B (en) | 2021-06-10 | 2023-10-27 | 卓郎(江苏)纺织机械有限公司 | Spinning box for open-end rotor spinning device |
DE102022114064A1 (en) * | 2022-06-03 | 2023-12-14 | Saurer Spinning Solutions Gmbh & Co. Kg | Thread take-off nozzle and open-end spinning device with a thread take-off nozzle |
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EP0220546A1 (en) * | 1985-10-15 | 1987-05-06 | Maschinenfabrik Rieter Ag | Spinning device for open-end spinning |
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JP2708000B2 (en) * | 1995-02-10 | 1998-02-04 | 村田機械株式会社 | Spinning equipment |
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- 2017-07-26 DE DE102017116893.1A patent/DE102017116893A1/en not_active Withdrawn
- 2017-07-26 EP EP17183275.1A patent/EP3276057B1/en active Active
- 2017-07-27 CN CN201710626331.XA patent/CN107663683B/en active Active
- 2017-07-27 US US15/661,659 patent/US10689779B2/en active Active
Non-Patent Citations (1)
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Publication number | Publication date |
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CN107663683A (en) | 2018-02-06 |
US10689779B2 (en) | 2020-06-23 |
US20180030624A1 (en) | 2018-02-01 |
EP3276057A1 (en) | 2018-01-31 |
CN107663683B (en) | 2022-06-07 |
DE102017116893A1 (en) | 2018-02-01 |
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