THREAD GUIDE DEVICE FOR A WINDING APPARATUS

Abstract

A thread guide device for the winding apparatus of a workstation of a textile machine producing cross-wound bobbins, wherein the winding apparatus has a bobbin drive roller for rotating a cross-wound bobbin, and also a thread traversing device for traversing a thread running onto the surface of the cross-wound bobbin. In order, when winding a cross-wound bobbin during which a thread running onto the surface of a cross-wound bobbin is traversed and a thread traversing triangle thus results, to prevent thread length changes occurring which would have a negative effect on the winding result, there is provision according to the invention that the thread guide device has a spherically formed thread slide surface.

Claims

1. A thread guide device for a winding apparatus of a workstation of a textile machine producing cross-wound bobbins, wherein the winding apparatus has a bobbin drive roller for rotating a cross-wound bobbin, and also a thread traversing device for traversing a thread running onto a surface of the cross-wound bobbin, wherein the thread guide device has a spherically designed thread slide surface.

2. The thread guide device according to claim 1, wherein a spherical design of the thread slide surface is independent of a width of the cross-wound bobbins to be produced.

3. The thread guide device according to claim 1, wherein the thread guide device is preferably arranged upstream of the thread traversing device.

4. The thread guide device according to claim 1, wherein, initiated by the thread traversing device, a thread traversing triangle is given upstream of a last thread guide point of the workstation during a winding operation.

5. The thread guide device according to claim 4, wherein the thread traversing triangle has corner points.

6. The thread guide device according to claim 5, wherein one of the corner points is predetermined by a thread guide point.

7. The thread guide device according to claim 5, wherein one of the corner points is predetermined by the thread guide contours of a thread guide that can preferably be driven by a single motor.

8. The thread guide device according claim 1, wherein the thread guide device is made of stainless steel.

9. The thread guide device according to claim 1, wherein the thread guide device can be fastened to a workstation housing of the workstation so as to be demountable.

10. The thread guide device according to claim 1, wherein the thread guide device has mounting devices in or on which thread guide pins spaced apart from one another can be fastened.

11. The thread guide device according to claim 10, wherein the mounting devices are designed so as to allow for a correction of a distance of the thread guide pins.

12. A workstation of a textile machine producing cross-wound bobbins comprising: a winding apparatus having a bobbin drive roller for rotating a cross-wound bobbin; and a thread traversing device for traversing a thread running onto a surface of the cross-wound bobbin; the winding apparatus including a thread guide device having a spherically designed thread slide surface.

13. A workstation of a textile machine assembly comprising: a cross-wound bobbin; a winding apparatus having a bobbin drive roller for rotating the cross-wound bobbin; and a thread traversing device for traversing a thread running onto a surface of the cross-wound bobbin; the winding apparatus including a thread guide device having a spherically designed thread slide surface.

Description

[0024] FIG. 1 shows a highly schematic side view of a workstation of a cross-winding machine with a winding apparatus having a thread guide device designed according to the invention;

[0025] FIG. 2 shows a partially perspectival front view of the winding apparatus of a workstation, with a thread traversing device and a thread guide device having a spherically designed thread slide surface according to the invention;

[0026] FIG. 3 shows a first, advantageous embodiment of a thread guide device with a spherically designed thread slide surface.

[0027] FIG. 1 shows a schematic side view of a workstation 2 of a cross-winding machine 1. Such workstations 2 are used for rewinding spinning cops 3, which have been produced on the spinning stations of ring spinning machines that are upstream in the production process and that have relatively little yarn material, into large-volume cross-wound bobbins 5 which, after their completion, are transferred to a machine-long cross-wound bobbin transport device 7 by means of a service assembly (not shown), and are transported by the cross-wound bobbin transport device to a bobbin loading station, arranged on the machine end side, or the like.

[0028] For supplying the workstations 2 with fresh spinning cops 3 or for disposing the empty sleeves 17 unwound at the workstations 2, such cross-winding machines 1 often have a sleeve and bobbin transport system 6, in which transport plates 11so-called peg traysequipped with spinning cops 3 or empty sleeves 17 circulate. Of such a sleeve and bobbin transport system 6, only the cop feed line 24, the reversibly drivable storage section 25, the transverse transport paths 26 leading to the workstations 2 and each equipped with an unwinding position UP, and the sleeve return line 27 are shown in FIG. 1.

[0029] The workstations 2 of such cross-winding machines 1 are also known to be equipped with various handling and sensor devices which enable smooth operation of the workstations 2in particular, the production of proper cross-wound bobbins 5during the winding process. One of these handling devices of the workstations 2 is, for example, the winding apparatus denoted by reference number 4, which has a bobbin frame 8, mounted so as to be movable about a pivot axis 12, for holding a cross-wound bobbin 5 in a freely rotatable manner. As illustrated, the cross-wound bobbin 5 rests with its surface on a bobbin drive roller 9 during the regular winding process and is entrained by the latter via frictional engagement. The bobbin drive roller 9 is connected, for example, to a single electric motor drive 22, which is in communication with a workstation computer 28 via a control line 18.

[0030] A thread traversing device 10 is provided for traversing the thread 16 pulled off a spinning cop 3 and running onto the cross-wound bobbin 5 during the winding process, which thread traversing device continuously traverses the thread 16 between the two face sides of the cross-wound bobbin 5. The thread traversing device 10 is equipped with a thread guide 13preferably a finger thread guide in this exemplary embodiment-which is acted upon by an individual drive 14 that is connected to the workstation computer 28 via a control line 15.

[0031] Furthermore, a thread guide device 23 designed according to the invention is arranged directly upstream of the thread guide 13 of the thread traversing device 10, which thread guide device 23 will be explained in more detail below with reference to FIGS. 2 and 3.

[0032] Each of the workstations 2 of such a cross-winding machine 1 also has a pivotably mounted suction nozzle 19, to which negative pressure can be applied, for handling the so-called upper thread, a pivotably mounted gripper tube 20, to which negative pressure can be applied as well, for handling the lower thread, and a pneumatic thread splicing device 21, by means of which, if necessary (for example, after thread breakage), the thread ends of the upper and lower threads can be combined again almost in a yarn-like manner.

[0033] The workstations 2 of such cross-winding machines 1 are also generally often equipped with further devicesfor example, a lower thread sensor 29, a thread tensioner 30, an electronic thread cleaner 31, a thread cutting device 32, a waxing device 33, and a thread tension sensor 34. These devices are also connected to the workstation computer 28 via control and signal lines.

[0034] As is known, the electronic thread cleaner 31 performs constant quality monitoring of the running thread 16 during the rewinding process. This means that the thread cleaner 31 continuously monitors the thread 16 passing through it and thereby detects serious thread defects, such as thread breakage, double threads, and thin or thick spots.

[0035] During the rewinding process, the running thread 16 is moreover generally scanned by a thread tension sensor 34 which is arranged in the thread path upstream of the thread traversing device 10.

[0036] FIG. 2 shows a partially perspectival front view of the winding apparatus 4 of a workstation 2 of a cross-winding machine 1. As is known, the winding apparatus 4 has, among other things, a bobbin drive roller 9 for rotating a cross-wound bobbin 5, and a thread traversing device 10. The thread traversing device 10 has a thread guide 13 which can be traversed by means of an individual drive 14. Moreover, a thread guide device 23, which according to the invention has a spherically designed thread slide surface 35, is installed directly in front of the thread guide 13 of the thread traversing device 10. The thread guide device 23 is preferably made of stainless steel and/or coated, and is accordingly corrosion-resistant and relatively abrasion-resistant. The thread guide device 23 is moreover equipped with thread guide pins 41 which constitute boundaries for the running thread 16.

[0037] As indicated, the running thread 16 traversed by the thread guide 13 forms a thread traversing triangle 36 having corner points A, B, and C during the winding process. Corner point A lies on the output side of the thread guide 42 of a thread guide point 34 arranged upstream of the thread guide device 23 in the thread path, which thread guide point 34 is formed by the thread tension sensor in this exemplary embodiment. Corner points B or C are predetermined by the thread guide contours 37 or 38 of the thread guide 13 positioned in one of its predeterminable end positions.

[0038] Rotor spinning machines or air-jet spinning machines, which are likewise used for producing cross-wound bobbins 5, also have workstations 2 with such winding apparatuses 4.

[0039] FIG. 3 shows in detail an advantageous exemplary embodiment of a thread guide device 23 according to the invention. Such thread guide devices 23 can be fixed to the workstation housing 39 of a workstation 2 so as to be demountablefor example, using screw connections that pass through lateral projections 43. Such thread guide devices 23 can therefore be removed and replaced quickly and easily, if necessary.

[0040] The thread guide devices 23 moreover have mounting devices 40 for fastening thread guide pins 41, wherein the mounting devices 40 are designed such that the clear width W of the thread guide pins 41 can be adjusted as needed, wherein the distance W of the thread guide pins 41 can be corrected at any time. This means that, during the winding process, the thread guide pins 41 reliably prevent the thread 16 running onto the cross-wound bobbin 5 from slipping off the spherically designed thread slide surface 35 of the thread guide device 23.

LIST OF REFERENCE SIGNS

[0041] 1 Cross-winding machine [0042] 2 Workstation of 1 [0043] 3 Spinning cop [0044] 4 Winding apparatus [0045] 5 Cross-wound bobbin [0046] 6 Sleeve and bobbin transport system [0047] 7 Cross-wound bobbin transport device [0048] 8 Bobbin frame [0049] 9 Bobbin drive roller [0050] 10 Thread traversing device [0051] 11 Peg tray [0052] 12 Pivot axis of 8 [0053] 13 Thread guide [0054] 14 Single drive of 13 [0055] 15 Control line [0056] 16 Thread [0057] 17 Empty sleeve [0058] 18 Control line [0059] 19 Suction nozzle [0060] 20 Gripper tube [0061] 21 Thread splicing device [0062] 22 Single drive of 9 [0063] 23 Thread guide device [0064] 24 Cop feed line [0065] 25 Storage section [0066] 26 Transverse transport section [0067] 27 Sleeve return section [0068] 28 Workstation computer [0069] 29 Lower thread sensor [0070] 30 Thread tensioner [0071] 31 Thread cleaner [0072] 32 Thread cutting device [0073] 33 Waxing device [0074] 34 Thread guide point [0075] 35 Thread slide surface [0076] 36 Thread traversing triangle [0077] 37 Thread guide contour of 13 [0078] 38 Thread guide contour of 13 [0079] 39 Workstation housing [0080] 40 Mounting device [0081] 41 Thread guide pin [0082] 42 Thread guide on 34 [0083] 43 Projection [0084] A corner point of 36 [0085] B Corner point of 36 [0086] C corner point of 36 [0087] UP Unwinding position [0088] W Distance of 41