Yarn guide device for a winding device

Abstract

The present invention relates to a yarn guide device (23) for a winding device of a workstation (2) of a textile machine (1) for manufacturing traverse bobbins, in which the winding device (4) has a bobbin drive roller (9) for rotating a traverse bobbin (5) and a yarn traverse device (10) for traversing a yarn (16) running on the surface of the traverse bobbin (5). When winding the traverse bobbin (5), the yarn (16) running on the surface of the traverse bobbin (5) is traversed to form a yarn traverse triangle (36), and in order to prevent the occurrence of a change in yarn length that adversely affects the winding result, according to the present invention, the yarn guide device (23) has a spherically shaped yarn sliding surface (35).

Description

[Technical field]

[0001] The present invention relates to a yarn guide device for a winding device of a workstation of a textile machine for producing traverse bobbins, the winding device having a bobbin drive roller for rotating the traverse bobbin and a yarn traverse device for traversing a yarn running on the surface of the traverse bobbin. [Background technology]

[0002] Yarn traverse devices have long been known in connection with the winding devices of textile machines producing traverse bobbins, for example rotor spinning machines or traverse machine workstations, and are described in various embodiments in the patent literature. Such yarn traverse devices are generally used to traverse a running yarn on the surface of a rotatingly driven traverse bobbin, forming a yarn traverse triangle. However, if corresponding measures are not taken, there will always be differences in the yarn lengths of the running yarns during the winding process with such a yarn traverse triangle, which often have a very negative effect on the traverse bobbins produced.

[0003] In order to minimize such yarn length differences, i.e. to keep the yarn length differences occurring in the area of ​​the yarn traverse triangle when winding the traverse bobbin as small as possible, various yarn guide devices for yarn traverse devices have already been developed.

[0004] However, known winding devices of rotor or air jet spinning machine workstations and known winding devices of traverse machines can differ significantly both in terms of the configuration of the yarn traverse device and in terms of the configuration of the yarn guide device and how the guide device is configured.

[0005] For example, DE 42 23 835 A1 and / or DE 43 30 647 A1 show and describe winding machines in which the yarn traversing devices are each formed by a circulating endless belt on which are mounted yarn entraining means and which can be driven by a single motor. The yarn entraining means traverse the running yarn between two yarn transport points which are in each case arranged at the ends of the traverse zone. The yarn guide device is in each case installed upstream of the yarn traversing device, extends over the length of the traverse zone and is formed, for example, by a fixed sheet metal element with a convexly running rounded yarn guide edge.

[0006] However, a comparable winding device, which differs in some details from the above-mentioned winding device, is known from DE 10051997 A1. This known winding device uses a thread guide as a yarn traverse device, which is fixed to an alternatingly drivable toothed belt. In this case, a thread guide device designed as a convexly curved round bar is arranged somewhat upstream of the thread guide of the yarn traverse device.

[0007] DE 10 2007 018 660 A1 further discloses a winding device which uses a finger yarn guide as the yarn traverse device, which can be driven by a single motor. Upstream of the finger yarn guide, a yarn guide device is arranged which is formed by a sheet metal element with a convexly curved yarn sliding surface. The yarn sliding surface of the yarn guide device extends linearly in the direction of the running yarn.

[0008] Although the above-mentioned yarn guide device has been able to reduce to some extent the yarn length differences of the running yarns which occur in the area of ​​the yarn traverse triangle during the manufacture of the traverse bobbin, the known yarn guide device has not yet been fully developed and can certainly be improved. Summary of the Invention

[0009] Proceeding from the above-mentioned prior art, the object of the present invention is to develop a yarn guide device which prevents yarn length differences of the running yarn in the area of ​​the yarn traverse triangle from occurring during winding onto a traverse bobbin.

[0010] This object is achieved according to the invention by a yarn guide device having a spherically designed yarn guiding surface.

[0011] Advantageous embodiments of the yarn guide device according to the invention are the subject of the dependent claims.

[0012] The advantage of the yarn guide device according to the invention is, in particular, that the yarn length between the yarn guide point and the traverse bobbin or within the yarn traverse triangle is equalized during the winding process, which means that the yarn length existing between the yarn guide contour of the yarn guide of the yarn traverse device and the yarn guide point when the yarn guide is positioned in the center is approximately the same as the yarn length resulting between the yarn guide contour of the yarn guide and the yarn guide point when the yarn guide is in one of its two end positions, so that the formation of yarn tension peaks is largely prevented during the winding process.

[0013] Furthermore, the use of a yarn guide device with a spherically shaped yarn sliding surface not only allows for precise adjustment of the desired traverse width of the traverse bobbin, but also reduces the traverse shortening that occurs during the bobbin run, which means that a traverse bobbin wound with a yarn guide device designed according to the invention has a more uniform side appearance and therefore more yarn material compared to a traverse bobbin wound with a yarn guide device having a conventional guide contour.

[0014] In an advantageous embodiment, the specific shape of the spherical yarn slide surface of the yarn guide device is made independent of the width of the traverse bobbin to be produced. This means that, although the yarn length changes to be compensated in the yarn traverse triangle during the winding process depend on the width of the traverse bobbin to be produced, it is not necessary to use a yarn guide device with a relatively clearly defined spherical yarn slide surface when producing wide traverse bobbins, or a yarn guide device with a less pronounced spherical yarn slide surface when producing narrow traverse bobbins. However, depending on the yarn fineness, yarn properties and / or material combination of the yarn to be processed, it may be advantageous to use geometric variants of the spherical design.

[0015] Advantageously, the yarn guide devices are each arranged immediately before the yarn traverse device, in such a way that it is reliably prevented that the yarn, which is drawn out of the spinning cop and runs over the surface of the traverse bobbin during the winding process, inadvertently slips off the yarn guide contour of the yarn guide, which is designed, for example, in the shape of a fork.

[0016] As already mentioned, the yarn drawn from the spinning cop and running on the surface of the traversing bobbin is initiated by the yarn traverse device to form a yarn traverse triangle upstream of the last yarn guide point of the workstation during the winding operation. The last yarn guide point can be a yarn tension sensor. It is also conceivable within the scope of the invention that the last yarn guide point is formed by an eyelet or the like.

[0017] The yarn traverse triangle has three vertices, the first of which is in the region of the yarn guide point, and the other two vertices are predetermined by a yarn guide contour of a yarn guide which can be driven by a single motor and are in each case located in one of its end positions. This means that the yarn unwound from the spinning cop is moved alternately to the vertices by the yarn guide contour of the yarn guide after passing the yarn guide point, and the spherically designed yarn sliding surface of the yarn guide device prevents yarn length changes in all positions of the yarn guide of the running yarn.

[0018] In an advantageous embodiment, the yarn guide device is made of stainless steel. Such stainless steel structures are not only very corrosion-resistant, but also relatively wear-resistant. This means that such a yarn guide device made of stainless steel and with a spherically designed yarn sliding surface is characterized by a long service life. It is also conceivable that the yarn guide device is made of other materials. What is important for the invention is that the yarn guide device has good sliding properties and good wear and chemical resistance.

[0019] Preferably, the yarn guide devices are each removably fixed to a workstation housing of the workstation, which means that the yarn guide devices can be quickly and easily removed as required and replaced with yarn guide devices, e.g. having a more spherical yarn gliding surface.

[0020] According to a preferred embodiment, the work station is a traverse station of a traverse machine or a spinning station of a spinning machine.

[0021] The yarn guide device further comprises a mounting device, on / in which a yarn guide pin can be fixed, which reliably prevents the running yarn from slipping off the spherically designed yarn sliding surface of the yarn guide device during the winding process. The mounting device not only allows an easy and precise adjustment of the distance of the yarn guide pin, but also allows for the correction of this distance at any time, if necessary.

[0022] Further details of the invention can be gleaned from the exemplary embodiments shown below with reference to the drawings, in which: [Brief description of the drawings]

[0023] The drawings are as follows: [Figure 1] 1 shows a highly schematic side view of a traverse workstation equipped with a winding device having a yarn guide device designed according to the invention; [Diagram 2]1 shows a partial perspective front view of a winding device of a workstation with a yarn traverse device and a yarn guide device with a spherically designed yarn sliding surface according to the invention; [Diagram 3] 1 shows a first advantageous embodiment of a yarn guide device with a spherically designed yarn guiding surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] 1 shows a schematic side view of a workstation 2 of a traverse machine 1. Such a workstation 2 is used to rewind spinning cops 3 produced in a spinning station of a ring spinning machine with a relatively small amount of yarn material located upstream in the manufacturing process onto a large number of traverse bobbins 5, which, after completion, are transferred by a service device (not shown) to a traverse bobbin transport device 7 located on the longitudinal side of the machine, and are transported by this traverse bobbin transport device to a bobbin loading station or the like located on the end side of the machine.

[0025] To supply the workstation 2 with new spinning cops 3 or to discard empty sleeves 17 unwound at the workstation 2, such traverse machines 1 often have a sleeve-bobbin transport system 6, in which transport plates 11 with the spinning cops 3 or empty sleeves 17, so-called peg trays, circulate. Of such a sleeve- and bobbin transport system 6, only a cop supply line 24, a reversibly drivable store 25, a lateral transport path 26 leading to the workstation 2, each with an unwinding position UP, and a sleeve return line 27 are shown in FIG.

[0026] The workstation 2 of such a traverse machine 1 is also known to be equipped with various handling and sensor devices, which allow a smooth operation of the workstation 2 and in particular the production of suitable traverse bobbins 5 during the winding process. One of these processing devices of the workstation 2 is, for example, a winding device, indicated with the reference number 4, which has a bobbin frame 8 movably mounted about a pivot axis 12 for holding the traverse bobbin 5 in a freely rotatable manner. As shown, the traverse bobbin 5 rests with its surface on a bobbin drive roller 9 during the normal winding process and is entrained by the bobbin drive roller 9 via frictional engagement. The bobbin drive roller 9 is connected to a single electric motor drive 22, which for example communicates with a workstation computer 28 via a control line 18.

[0027] A yarn traverse device 10 is provided for traversing the yarn 16, which is drawn off from the spinning cop 3 and runs on the traverse bobbin 5, during the winding process, and which traverses the yarn 16 continuously between both end faces of the traverse bobbin 5. The yarn traverse device 10 comprises a yarn guide 13, preferably a finger yarn guide in this exemplary embodiment, which is actuated by a separate drive 14 connected via a control line 15 to a workstation computer 28.

[0028] Furthermore, a yarn guide device 23 designed according to the invention is arranged immediately upstream of the yarn guide 13 of the yarn traverse device 10, this yarn guide device 23 being explained in more detail below with reference to FIGS.

[0029] Each workstation 2 of such a traverse machine 1 furthermore has a pivotally mounted suction nozzle 19 capable of applying a negative pressure for treating the so-called upper thread, a pivotally supported gripper tube 20 also capable of applying a negative pressure for treating the lower thread, and a pneumatic yarn splicing device 21, by means of which the ends of the upper and lower threads can be brought together again in an approximately thread-like manner if necessary (for example after a thread breakage).

[0030] The workstation 2 of such a traverse machine 1 typically also comprises further devices, such as a lower thread sensor 29, a thread tensioning device 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 a workstation computer 28 via control and signal lines.

[0031] As is known, the electronic yarn cleaner 31 performs a constant quality monitoring of the running yarn 16 during the unwinding operation. This means that the yarn cleaner 31 continuously monitors the passing yarn 16 and thereby detects significant yarn defects such as yarn breaks, double yarns and thin or thick spots.

[0032] During the unwinding operation, the running yarn 16 is further scanned by a yarn tension sensor 34 , which is typically located in the yarn path upstream of the yarn traverse device 10 .

[0033] 2 shows a partial perspective front view of the winding device 4 of the workstation 2 of the traverse machine 1. As is known, the winding device 4 comprises, inter alia, a bobbin drive roller 9 for rotating the traverse bobbin 5 and a yarn traverse device 10. The yarn traverse device 10 comprises a yarn guide 13, which can be traversed by means of a separate drive 14. Furthermore, according to the invention, a yarn guide device 23 with a spherically designed yarn sliding surface 35 is arranged immediately before the yarn guide 13 of the yarn traverse device 10. The yarn guide device 23 is preferably made of stainless steel and / or coated and is therefore corrosion-resistant and relatively wear-resistant. The yarn guide device 23 further comprises a yarn guide pin 41 which constitutes the boundary of the running yarn 16.

[0034] As shown, the running yarn 16 traversed by the yarn guide 13 forms a yarn traverse triangle 36 with vertices A, B and C during the winding process. Vertex A is on the output side of the yarn guide 42 of a yarn guide point 34 arranged in the yarn path upstream of the yarn guide device 23, which in this exemplary embodiment is formed by a yarn tension sensor. Vertex B or C is predetermined by a yarn guide contour 37 or 38 of the yarn guide 13, which is positioned in one of its predetermined end positions.

[0035] Similarly, a rotor or air-jet spinning machine used to manufacture traverse bobbins 5 also has a workstation 2 equipped with such a winding device 4 .

[0036] 3 shows in detail an advantageous exemplary embodiment of a thread guide device 23 according to the invention. Such a thread guide device 23 can be removably fixed to the workstation housing 39 of the workstation 2, for example by means of a screw connection passing through a lateral projection 43. Such a thread guide device 23 can therefore be quickly and easily removed and replaced if necessary.

[0037] The yarn guide device 23 furthermore has a mounting device 40 for fixing the yarn guide pin 41, which is designed in such a way that the inner width W of the yarn guide pin 41 can be adjusted as required, so that the distance W of the yarn guide pin 41 can be corrected at any time. This means that during the winding process, the yarn guide pin 41 reliably prevents the yarn 16 running on the traverse bobbin 5 from slipping off the spherically designed yarn sliding surface 35 of the yarn guide device 23.

[0038] List of reference numbers 1 Traverse machine 2 in 1 workstation 3. Spinning Cup 4 Winding device 5 Traverse bobbin 6 Sleeve and bobbin transport system 7. Traverse bobbin transport device 8 Bobbin Frame 9 Bobbin drive roller 10 Yarn traverse device 11 Peg Tray 12 8 pivot points 13 Thread guide 14 13 single drive 15 Control Line 16 Thread 17 Empty Sleeve 18 Control Line 19 Suction nozzle 20 Gripper tube 21 Thread splicing device 22 9 single drive 23 Yarn guide device 24 cup supply line 25 Storage 26 Lateral conveying section 27 Sleeve return part 28 Workstation Computers 29 Lower thread sensor 30 Thread tensioning device 31 Thread cleaner 32 Thread cutting device 33 Waxing device 34 Thread guide point 35 Thread sliding surface 36 Thread Twill Triangle 37 13 thread guide contours 38 13 thread guide contours 39 Workstation Housing 40 Mounting device 41 Thread guide pin 42 34 Upper thread guide 43 Protrusion The pinnacle of A36 The pinnacle of B36 The pinnacle of C36 UP unwinding position Distance from W41

Claims

1. A yarn guide device (23) for a winding device (4) of a workstation (2) of a textile machine (1) for manufacturing a traverse bobbin, the winding device (4) having a bobbin drive roller (9) for rotating a traverse bobbin (5) and a yarn traverse device (10) for traversing a yarn (16) running on the surface of the traverse bobbin (5), A yarn guide device (23), characterized in that the yarn guide device (23) has a spherically designed yarn sliding surface (35).

2. 2. A yarn guide device (23) according to claim 1, characterized in that the particular spherical design of the yarn sliding surface (35) is independent of the width of the traversing bobbin (5) to be produced.

3. 3. A yarn guide device (23) according to claim 1 or 2, characterized in that the yarn guide device (23) is preferably arranged upstream of the yarn traverse device (10).

4. 3. The yarn guide device (23) according to claim 1 or 2, characterized in that, initiated by the yarn traverse device (10), a yarn traverse triangle (36) is provided upstream of the last yarn guide point (34) of the workstation (2) during the winding operation.

5. 5. The yarn guide device (23) according to claim 4, characterized in that the yarn traverse triangle (36) has vertices (A, B, C).

6. 6. A yarn guide device (23) according to claim 5, characterized in that the apex (A) is predetermined by a yarn guide point (34).

7. 6. A yarn guide device (23) according to claim 5, characterized in that the vertex (B or C) is predetermined by a yarn guide contour (37 or 38) of a yarn guide (13) which can preferably be driven by a single motor.

8. 3. A yarn guide device (23) according to claim 1 or 2, characterized in that the yarn guide device (23) is preferably made of stainless steel.

9. 3. A thread guide device (23) according to claim 1 or 2, characterized in that the thread guide device (23) can be removably secured to a workstation housing (39) of a workstation (2).

10. 3. The yarn guide device (23) according to claim 1 or 2, characterized in that the yarn guide device (23) comprises a mounting device (40) on / in which spaced apart yarn guide pins (41) can be fixed.

11. Thread guide device (23) according to claim 10, characterized in that the mounting device (40) is designed to allow correction of the distance of the thread guide pins (41) as required.

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