THREAD-GUIDING DEVICE FOR A WORKSTATION OF A TEXTILE MACHINE WHICH PRODUCES CROSS-WOUND BOBBINS

Abstract

Thread-guiding device for a workstation of a textile machine which produces cross-wound bobbins. The workstation has an unwinding aid device for feed bobbins, a winding device for producing a cross-wound bobbin and a thread-guiding channel which surrounds the thread path and which can be subjected to negative pressure. The thread-guiding device is installed at the end face of the thread-guiding channel in the region of a suction head above the regular thread path in the workstation and is designed such that during a thread cutting process initiated during the winding operation, the thread end of the newly created upper thread, said thread end shooting upwards as a result of the thread tension in the running thread, enters the thread-guiding device and is guided in a controlled manner by the thread-guiding device in the direction of the center of the cross-wound bobbin.

Claims

1. A thread-guiding device for a workstation of a textile machine which produces cross-wound bobbins, wherein the workstation has an unwinding aid device for feed bobbins, a winding device for producing a cross-wound bobbin and a thread-guiding channel which surrounds a thread path and which can be subjected to negative pressure, wherein the thread-guiding device is installed at an end face of the thread-guiding channel in a region of a suction head above the thread path in the workstation and is designed such that during a thread cutting process initiated during a winding operation, a thread end of a newly created upper thread, the thread end shooting upwards as a result of a thread tension in a running thread, enters the thread-guiding device and is guided in a controlled manner by the thread-guiding device in a direction of a center of the cross-wound bobbin.

2. The thread-guiding device according to claim 1, wherein the thread-guiding device has a thread-guiding plate with a mirror-image thread-guiding contour.

3. The thread-guiding device according to claim 2, wherein the thread-guiding device has an upper connecting strip arranged at a distance from the thread-guiding plate.

4. The thread-guiding device according to claim 2, wherein the mirror-image thread-guiding contour is formed by two guiding surfaces arranged in mirror image, which in each case have a concavely curved thread-guiding region and an adjoining convexly curved thread-braking slot.

5. The thread-guiding device according to claim 3, wherein the mirror-image thread-guiding contour has two linear, converging thread-guiding regions.

6. The thread-guiding device according to claim 5, wherein the thread-guiding regions are arranged at a first angle with respect to an outer edge of the thread-guiding device and at a second angle relative to one another, wherein an intersection point of the thread-guiding regions is positioned at a distance with respect to the upper connecting strip.

7. The thread-guiding device according to claim 5, wherein the two thread-guiding regions, which in each case have a length corresponding to approximately of a length of the thread-guiding device, are arranged at an angle relative to one another and an intersection point of the thread-guiding regions is positioned in a region of the upper connecting strip.

8. The thread-guiding device according to claim 5, wherein the two thread-guiding regions are arranged at an angle relative to one another and an intersection point of the thread-guiding regions is positioned at a distance from the upper connecting strip.

9. The thread-guiding device according to claim 5, wherein the two thread-guiding regions are arranged at an angle relative to one another, an intersection point of the thread-guiding regions is positioned in a region of the upper connecting strip and the thread-guiding regions have a length that corresponds approximately to a length of the thread-guiding device.

10. The thread-guiding device according to claim 5, wherein the mirror-image thread-guiding contour has two relatively short linear thread-guiding regions which are arranged at an angle relative to one another and an intersection point thereof is positioned at a distance from the upper connecting strip.

11. The thread-guiding device according to claim 2, wherein the mirror-image thread-guiding contour has two linear thread-guiding regions overlapping at an end face, wherein an overlapping point is arranged almost centrally with respect to the thread-guiding device.

12. The thread-guiding device according to claim 2, wherein the mirror-image thread-guiding contour is formed by two separate, relatively short thread-stabilizing projections pointing towards a central axis of the thread-guiding device.

13. The thread-guiding device according to claim 2, wherein the mirror-image thread-guiding contour has two separate thread-catching arms pointing almost towards a central axis of the thread-guiding device, which in each case have a short linear thread-guiding region and an adjoining corrugated thread-guiding surface.

14. The thread-guiding device according to claim 5, wherein the mirror-image thread-guiding contour has a convexly curved thread-guiding region provided with a hook projection on both sides in each case and an intersection point of the thread-guiding regions is positioned at a distance from the upper connecting strip.

15. The thread-guiding device according to claim 3, wherein the mirror-image thread-guiding contour has two linear thread-guiding regions, in each case having a bend, wherein an intersection point of the two linear thread-guiding regions that are angled is positioned in a region of the upper connecting strip.

Description

[0029] In the drawings:

[0030] FIG. 1 shows a perspective view of a workstation of an automatic cross-winding machine with an unwinding aid device for feed bobbins, a winding device for producing cross-wound bobbins and a thread-guiding channel which surrounds the thread path and which can be subjected to negative pressure, wherein a thread-guiding device according to the invention is installed in a suction head arranged at the end face of the thread-guiding channel,

[0031] FIG. 2 shows a front view of a first advantageous embodiment of a thread-guiding device according to the invention,

[0032] FIG. 3 shows a side view of the thread-guiding device according to FIG. 2,

[0033] FIG. 4-13 show further advantageous embodiments of a thread-guiding device according to the invention.

[0034] Automatic cross-winding machines, whose workstations are in each case equipped with an unwinding aid device for feed bobbins, a winding device for producing a cross-wound bobbin and a thread-guiding channel which can be subjected to negative pressure and surrounds the thread path in the workstation, are known and are described in relative detail in DE 10 2014 009 203 A1, 10 2016 001 115 A1 or DE 10 2018 128 815 A1, for example.

[0035] Such automatic cross-winding machines usually have a large number of identical workstations 1 on which, as shown in FIG. 1, feed bobbins 2, usually spinning cops produced on a ring spinning machine, which have only relatively little yarn material, are rewound into large-volume cross-wound bobbins 5.

[0036] The finished cross-wound bobbins 5 are subsequently transferred by means of an automatically operating service unit, for example by means of a so-called cross-wound bobbin changer, to a machine-length cross-wound bobbin transport device (not shown) and transported to a bobbin loading station or the like arranged at the end face of the machine.

[0037] Such automatic cross-winding machines also often have a logistics device in the form of a bobbin and a tube transport system, in which the feed bobbins 2 or the unwound empty tubes circulate, arranged vertically on transport plates.

[0038] As indicated in FIG. 1, the feed bobbins 2 delivered via the bobbin and tube transport system are in each case positioned in the unwinding position UP in the region of the workstations 1 and are rewound onto a cross-wound bobbin 5 in this unwinding position UP.

[0039] For this purpose, the individual workstations 1 have various thread monitoring and treatment devices, which ensure that the thread 29 is monitored for thread faults during the rewinding process and that any detected thread faults are cleaned out immediately.

[0040] The workstations 1 of such automatic cross-winding machines have, for example, a winding device 4, a thread-joining device 8, preferably in the form of a pneumatically operating thread-splicing device, a thread tensioner 9, a thread cleaner 10 and a thread tension sensor 35. Furthermore, such workstations can also be equipped with a paraffining device (not shown).

[0041] The winding devices 4 of such workstations 1 in each case have a bobbin frame 11, which is mounted so as to be movable about at least one pivot axis 30, and an associated cross-wound bobbin drive and traversing device.

[0042] With the present exemplary embodiment, a thread-guiding drum 34 is used as the cross-wound bobbin drive and traversing device, which rotates the cross-wound bobbin 5 in a frictionally engaged manner and at the same time ensures that the thread 29 winding onto the bobbin is traversed.

[0043] As can also be seen from FIG. 1, a thread-guiding channel 6 extends between the feed bobbin 2 positioned in the unwinding position UP and the winding device 4, surrounding the thread path in the workstation 1, the end region of which is designed as a suction head 21 and which can be subjected to a defined negative pressure if required. This thread-guiding channel 6 is equipped on the input side with an unwinding aid device 3 in the form of a telescopic suction foot 19, which is mounted so that it can be displaced in the vertical direction, for example by means of a drive device 36. If required, the suction foot 19 can be lowered at least partially over the feed bobbin 2, for example to take up the thread end of the bobbin thread. If required, for example if a pneumatic take-up of the thread end of an upper thread is required after a controlled thread cleaner cut, the thread-guiding channel 6 can also be closed, for example by a pivot-mounted cover element 7.

[0044] The thread-guiding channel 6 has different take-up housings behind the suction foot 19 in the thread running direction T. For example, a thread tensioner 9 is positioned in the take-up housing 33, while a thread-joining device 8 is installed in a subsequent take-up housing 18. The thread-guiding channel 6 is also equipped with take-up housings 32, 31, which are arranged behind the take-up housing 18 in the thread running direction T and in which a thread cleaner 10 and a thread tension sensor 35 are installed. In this region, a take-up housing (not shown) for a paraffining device can also be integrated into the thread-guiding channel 6.

[0045] On the output side, the thread-guiding channel 6 is designed as a suction head 21, wherein a thread-guiding device 23 according to the invention is installed in the suction head 21. The suction head 21 is connected to a machine-length suction air channel 17 via a suction opening to which a suction air nozzle 14 is connected. The suction air nozzle 14, like the suction air nozzles 12 and 13, which connect the take-up housing 18 of the thread-joining device 8 to the suction air channel 17, can be optionally subjected to negative pressure, for example via an aperture disk 15. This means that the rotatably mounted aperture disk 15 has defined positionable suction openings 16 that, depending on their position, ensure that one or more of the suction air nozzles 12, 13, 14 is/are continuously pneumatically connected to the suction air channel 17.

[0046] Instead of the aperture disk 15 shown in FIG. 1, other control devices are of course also conceivable in conjunction with the suction air nozzles 12, 13, 14. For example, each of the suction air nozzles could be connected to the suction air channel 17 by a separate valve device or the like.

[0047] As indicated above and shown in FIG. 1, the suction head 21 is equipped with a thread-guiding device 23 according to the invention. The thread-guiding device 23 is arranged in a defined manner above the regular thread path in the workstation 1 and has a thread-guiding plate 20, into the thread-guiding contour 22 of which the upwardly shooting thread end of the upper thread jumps, for example in the case of a controlled thread cleaner cut. The thread-guiding contour 22 of the thread-guiding plate 20 is preferably designed in a mirror-image equipped manner. Furthermore, the thread-guiding device 23 has an upper connecting strip 26, which is arranged at a slight distance from the thread-guiding plate 20 and via which the thread-guiding device 23 can be fixed in the suction head 21 in a defined manner.

[0048] In a preferred embodiment, the thread-guiding device 23 has a thread-guiding contour 22, as shown in FIG. 2, which is formed by two thread-guiding surfaces arranged in mirror image. The thread-guiding surfaces in each case have a concavely curved thread-guiding region 24 and an adjoining convexly curved thread-braking slot 25. In the case of a thread cleaner cut, as a rule, the thread end of the upper thread that jumps upwards shoots into the thread-guiding device 23 located above it according to the invention.

[0049] This means that the thread end hits one of the concavely curved thread-guiding regions 24 of the thread-guiding contour 22 of the thread-guiding device 23 and slides on it into one of the adjoining thread-braking slots 25. The thread end is then stabilized in the thread-braking slot 25 so that it subsequently winds onto the surface of the cross-wound bobbin 5 as prescribed and can subsequently be taken up pneumatically and transferred to the thread-joining device 8 without any problems.

[0050] However, a thread-guiding device 23 according to the invention can also have a differently designed thread-guiding contour 22 instead of the thread-guiding contour 22 described above. The thread-guiding contour 22 of a thread-guiding device 23 according to the invention can, for example, as shown in FIGS. 4, 8, 9, 11 and 12, have two linear, converging thread-guiding regions 24, which in each case meet at an intersection point I.

[0051] With the thread-guiding device 23 shown in FIG. 4, the thread-guiding regions 24B are arranged at an angle with respect to the outer edge 27 of the thread-guiding device 23 and at an angle a relative to one another. The intersection point S1 of the two thread-guiding regions 24B is positioned at a distance a with respect to the connecting strip 26, i.e. the intersection point S1 is relatively close to the region of the connecting strip 26.

[0052] FIG. 8 shows a similarly designed thread-guiding device 23. The two linear, converging thread-guiding regions 24C form an angle 1 between them, wherein the intersection point S2 is positioned directly in the region of the connecting strip 26. The thread-guiding regions 24C have a length that corresponds to approximately of the length L of the thread-guiding device 23.

[0053] The embodiment of a thread-guiding device 23 according to the invention shown in FIG. 9 also has linear, converging thread-guiding regions 24D, which intersect at an angle 2. However, the intersection point S3 of the thread-guiding regions 24D is positioned at a slightly greater distance b from the connecting strip 26.

[0054] The embodiment of a thread-guiding device 23 according to the invention shown in FIG. 11 also has linear, converging thread-guiding regions 24E. With this embodiment, the thread-guiding regions 24E intersect at an angle 3 and the intersection point S4 of the thread-guiding regions 24E is positioned directly in the region of the connecting strip 26. The thread-guiding regions 24E have a length that corresponds approximately to the length L of the thread-guiding device 23.

[0055] With the thread-guiding device 23 according to FIG. 12, the thread-guiding contour 22 is also formed by two linear, converging thread-guiding regions 24H, wherein the thread-guiding regions 24H converge relatively bluntly, i.e. the angle 1 between the thread-guiding regions 24H is greater than 90. With this embodiment, the intersection point S6 of the thread-guiding regions 24H is also positioned at a relatively large distance c from the connecting strip 26.

[0056] The thread-guiding contour 22 of the thread-guiding device 23 shown in FIG. 5 has two half-length linear thread-guiding regions 24A overlapping at the end face, wherein the overlapping point OP of the two thread-guiding regions 24A is arranged almost centrally with respect to the thread-guiding device 23.

[0057] FIGS. 6 and 7 show further embodiments of a thread-guiding device 23 according to the invention, which differ significantly from the embodiments described above.

[0058] As can be seen, the thread-guiding device 23 according to FIG. 6 has, for example, a thread-guiding contour 22, which is formed by two separate, relatively short thread-stabilizing projections 37 pointing towards the central axis C of the thread-guiding device 23.

[0059] A comparable thread-guiding device 23 is also shown in FIG. 7. With this thread-guiding device 23 as well, the thread-guiding contour 22 is formed by two separate elements pointing towards the central axis C of the thread-guiding device 23, which act as thread-catching arms 38. These thread-catching arms 38 in each case have a short linear thread-guiding region 24G and an adjoining corrugated thread-guiding surface. The thread-catching arms 38 of the thread-guiding device 23 in each case extend almost to the central axis C of the thread-guiding device 23 and are significantly larger than the thread-stabilizing projections 37 of the thread-guiding device 23 shown in FIG. 6.

[0060] Further possible embodiments of a thread-guiding device 23 according to the invention are shown in FIGS. 10 and 13.

[0061] The embodiment according to FIG. 10 has a mirror-image thread-guiding contour 22, which has a convexly curved thread-guiding region 24F on both sides in each case, provided with a hook projection 39. The intersection point S5 of the two thread-guiding regions 24F is positioned at a relatively short distance a from the connecting strip 26.

[0062] With the embodiment of a thread-guiding device 23 shown in FIG. 13, the thread-guiding contour 22 is characterized in that it has two linear thread-guiding regions 24K, in each case having a bend 28. The intersection point S7 of the angled thread-guiding regions 24K is positioned at a distance a from the connecting strip 26.

LIST OF REFERENCE SIGNS

[0063] 1 Workstation [0064] 2 Feed bobbin [0065] 3 Unwinding aid device [0066] 4 Winding device [0067] 5 Cross-wound bobbin [0068] 6 Thread-guiding channel [0069] 7 Cover element [0070] 8 Thread-joining device [0071] 9 Thread tensioner [0072] 10 Thread cleaner [0073] 11 Bobbin frame [0074] 12 Suction air nozzle [0075] 13 Suction air nozzle [0076] 14 Suction air nozzle [0077] 15 Aperture disk [0078] 16 Suction opening [0079] 17 Suction air channel [0080] 18 Take-up housing [0081] 19 Suction foot [0082] 20 Thread-guiding plate [0083] 21 Suction head [0084] 22 Thread-guiding contour [0085] 23 Thread-guiding device [0086] 24 Thread-guiding plate [0087] 25 Thread-braking slot [0088] 26 Connecting strip [0089] 27 Outer edge [0090] 28 Bend [0091] 29 Thread [0092] 30 Pivot axis [0093] 31 Take-up housing [0094] 32 Take-up housing [0095] 33 Take-up housing [0096] 34 Thread-guiding drum [0097] 35 Thread tension sensor [0098] 36 Drive device [0099] 37 Thread-stabilizing projections [0100] 38 Thread-catching arms [0101] 39 Hook projection [0102] UP Unwinding position [0103] T Thread running direction [0104] Angle [0105] Angle [0106] a Distance [0107] b Distance [0108] C Distance [0109] I Intersection point [0110] L Length [0111] OP Overlapping point [0112] C Central axis