Vibration damping device for a winding device of a textile machine for producing twill packages

Abstract

The present invention relates to a vibration damping device 18 for a winding device 4 of a textile machine 1 for producing a traverse package 5, for reducing vibrations occurring in a pivotally supported package frame 8 during the winding operation of the textile machine 1. In order to achieve a vibration damping device that is both safety- and contamination-proof and that always ensures a relatively stable vibration state of the package frame, it is proposed that the vibration damper be configured as a friction damper 20, which has a friction force that acts with different magnitudes depending on the direction of action, so that the friction force acting when lifting the traverse package 5 during the winding operation is significantly greater than the friction force acting when returning the traverse package 5.

Description

[Technical field]

[0001] The present invention relates to a vibration damping device for a winding device of a textile machine for producing twill packages, for reducing vibrations occurring in a pivotably supported package frame during the winding operation of the textile machine.

[0002] In textile machines producing traverse packages, such as open-end rotor spinning machines or automatic traverse winders, there is always the risk during the winding operation that strong vibrations of the package frame occur in the working unit which winds the traverse package, and in particular at the beginning of the package formation process and when producing relatively stiff traverse packages, the amplitude of the frame vibrations can often be so great as to decisively impair the winding process, i.e. to produce a traverse package which is hardly able to be unwound afterwards and is therefore unusable.

[0003] In order to avoid the production of such poor-quality traverse packages, in known spinning or winding machines, the pivotally supported package frame of the winding device is usually each equipped with a vibration damping device, i.e. the pivotally supported package frame having two package frame arms for holding the traverse package in a freely rotatable manner has a damping device which ensures that the vibrations of the package frame, which are almost unavoidable during the winding operation, are minimized as much as possible.

[0004] Such damping devices for pivotally supported packaging frames have been known for some time and have been described in various different embodiments, partly in relatively detail, in the patent literature.

[0005] For example, there is a prior art vibration damping device with a damping cylinder and a lifting cylinder, which comprises a pneumatically operated device for the defined lifting of the transverse winding package held in the package frame from its package drive roller or support roller, and a hydraulically operated damping device. The damping device preferably operates with oil as the damping means, i.e. by influencing the flow of the liquid damping means, a reduction of the package frame vibrations occurring during the winding operation is achieved.

[0006] A vibration damping device constructed in this way is described, for example, in the Schlafhorst handbook "AUTOCONER 238", pages 01.3.9 and 01.3.11.

[0007] Similar vibration damping devices for winding devices of textile machines for producing twill packages are also known from DE 41 21 780 A1, DE 195 34 333 A1 or DE 100 46 603 A1, which also describe winding devices in which the damping device for the package frame is designed as a hydraulic cylinder.

[0008] DE 41 21 780 A1, for example, illustrates and describes how in such hydraulic cylinders the pistons are each provided with several through-holes, which allow a damping medium, such as hydraulic oil, present in the cylinder to flow when the packaging frame vibrates, thereby damping the vibrations of the packaging frame.

[0009] The vibration damping device described in DE 100 46 603 A1 also works with a similar hydraulic cylinder. However, in this known damping device, the damping medium of the hydraulic cylinder is formed by a rheologically variable liquid, i.e. a liquid whose viscosity can be changed by a magnetic field generating device. In these known damping cylinders configured as hydraulic cylinders, a sealing ring is arranged between the lower cylinder part and the upper cylinder part.

[0010] Furthermore, such damping cylinders have a piston rod seal which should prevent the damping medium from escaping from the hydraulic cylinder. Although the sealing elements of the known damping cylinders have been constantly improved over time, there is always the risk of damping medium escaping in such hydraulically operated damping cylinders, which not only leads to contamination of the surroundings, but also to an often not immediately noticeable deterioration of the damping behavior, and in connection with the fiber dust which is almost unavoidable in textile processing operations, also represents a considerable fire hazard.

[0011] Therefore, various attempts have already been made in the past to replace hydraulically actuated damping devices of this kind by damping devices which do not require a liquid damping medium.

[0012] Swiss Patent No. 374003 describes, for example, a damping device which has an electromagnet which applies a load to an armature plate which is itself connected via a rod to a pivotally supported package frame to be damped. In this known damping device, a force component is thus generated by an electromagnet which, as is known, includes an electrically energizable coil, which presses a ferromagnetic armature plate connected to the package frame towards a stationary receiver. In this known damping device, therefore, a damping behavior based on mechanical friction between the movably supported armature plate and the stationary receiver occurs.

[0013] A comparable, but contact-free operating electromagnetic damping device is also known from DE 10012005. This damping device has a conductive, movable component which is at least indirectly connected to a packaging frame and is arranged so as to cross the magnetic field of a magnet system in which the component is stationarily arranged without contact. In this known damping device, the damping behavior is based on the generation of eddy currents in the conductive component. In practice, however, it has been found that both the damping device according to CH 374003 and the damping device according to DE 10012005 have various disadvantages. In damping devices based on the eddy current principle, for example, the forces induced in the conductive component by the magnetic field of the magnet system are not sufficient to achieve satisfactory damping. In practice, the above-mentioned damping device has never been able to establish itself.

[0014] Furthermore, from DE 2 606 859 A1, DE 10 2007 047 554 A1 or DE 19 924 390 A1, winding devices for a working unit of a textile machine for producing twill packages are known, in which a package frame, which is pivotably supported on the machine frame of the textile machine, is each equipped with a damping device, which acts as a friction damper, similar to the damping device known from CH 374 003 A1.

[0015] In the device according to DE 2 606 859 A1, for example, a movably supported packing frame is provided with a damped supported braking element which corresponds to a stationary counter-body, i.e. has a brake shoe which bears against a stationary counter-body arranged on the machine frame of the textile machine.

[0016] A device with friction elements for damping vibrations occurring in a package frame during the winding process of a twill package is also described in DE 10 2007 047 554 A1. In this damping device, a counterbody, which is likewise arranged stationary on the machine frame of the textile machine, is loaded by a friction element which can be loaded by a pneumatic cylinder.

[0017] The damping device described in DE 199 24 390 A1 has a guide rod movably mounted on the package frame, which guide rod corresponds to a brake element of a cylinder device arranged on the machine frame of a textile machine and supported so as to be limited and movable, in which a particularly slidable, pneumatically operable piston is supported, which brings a brake element into contact with the guide rod and thereby generates a friction moment which results in vibration damping of the corresponding package frame during the winding operation.

[0018] As discussed above, known damping systems have various shortcomings, which means that they are open to improvement.

[0019] Taking the above-mentioned prior art as a starting point, the object of the present invention is to improve a vibration damper for a pivotally supported package frame of a winding device of a textile machine for producing twill packages, in such a way that this vibration damper is problem-free in terms of the generation of contamination therein and ensures a relatively stable state of the package frame in terms of vibration technology during the winding process.

[0020] This object is achieved according to the invention in that the vibration damper is designed as a friction damper, which has friction forces that act with different strengths depending on the direction of action, and in that the friction forces acting when lifting the trellis winding package during the winding operation are greater than the friction forces acting when the trellis winding package is returned.

[0021] Advantageous embodiments of the invention are the subject of the dependent claims.

[0022] The vibration damper according to the invention has the advantage that, due to its design as a mechanically activated friction damper, the risk of contamination of the working unit by the escaping damping medium is not only eliminated, but also, due to the special design of the friction damper according to the invention, the problem of constant lifting of the traverse package due to vibrations is minimized during the winding process. The friction damper according to the invention generates direction-dependent friction forces, so that the friction forces acting in the locking direction during lifting of the traverse package are significantly greater than the friction forces acting during the lowering of the traverse package. Furthermore, the compact design of the friction damper makes it possible to retroactively integrate the damping device according to the invention in working units of textile machines whose package frames have previously been equipped with hydraulic damping cylinders. In order to be able to use the friction damper according to the invention advantageously, only a few minor modifications are required in the region of the working units of the textile machine.

[0023] In an advantageous embodiment, the friction damper according to the invention has a brake rod slidably supported with respect to a damper casing of the vibration damper, a stationarily arranged first brake element and a movably supported second brake element which can be applied against the brake rod by means of a support lever.

[0024] This design results in the friction damper having a locking direction and a free rotation direction. For this purpose, the support lever is arranged at an angle relative to the brake rod so that if the traverse package tries to lift off its associated package drive drum, the second brake element is automatically accelerated and pressed against the brake rod. This means that if during the winding process the traverse package resting on the package drive drum and driven by it in a frictionally coupled manner starts to vibrate, for example due to small irregularities, a force moment is immediately transmitted to the package frame. A force torque that tries to lift the package frame and thus also the casing of the vibration damper immediately causes a stronger pressure load on the second brake element, which results in a stronger friction moment.

[0025] The vibration damper now operates in the so-called locked direction.

[0026] In another advantageous embodiment, the vibration damper has a spring element, which applies a force-coupled load to a support lever arranged at an angle to the brake rod. The spring element is preferably configured as a compression spring, the pressure of which is adjustable by means of an adjustment screw. This configuration ensures that the friction force with which the brake element applies to the brake rod in the assembled state is defined and adjustable. This means that the magnitude of the friction force acting on the brake rod can be influenced via the pressure of the spring element, and thus it can be ensured that the support lever acts reliably in the locking direction as required.

[0027] In an advantageous embodiment, the support lever is connected to the second braking element in a limitedly movable manner on the one hand, and is supported in a guide of the damper housing via a guide and locking device on the other hand. The guide and locking device is supported slidably in a guide of the damper housing, which is preferably formed in a part-circular shape, and can be definedly positioned in the guide. The advantageously arranged guide and locking device forms a rotation and support point for the support lever during operation. This means that by correspondingly positioning the guide and locking device in the part-circular shape of the damper housing, it is possible to adjust the angle that the support lever occupies with respect to the brake rod and thus to influence the pressing pressure of the second braking element, which is strongly involved due to the friction moment.

[0028] Another advantageous embodiment provides that the first and second braking elements are formed as one and the same component, i.e. each has two through holes for mounting and a recess, in which a brake pad can be installed in a replaceable manner.

[0029] The use of identically designed brake elements has the advantage that the number of differently designed components is minimized and thus the manufacturing costs of the friction damper according to the invention can be kept relatively low. Furthermore, the provision of the brake elements with replaceable brake pads allows a controlled and inexpensive operation of the friction damper according to the invention. If an operator finds out, for example, that the traverse package does not run perfectly circular during the winding process, this may be due to a somewhat weakened damping behavior of the friction damper according to the invention. In such a case, a simple exchange of the brake pads can be easily performed and the optimum friction behavior of the damping cylinder can be established again.

[0030] The invention will now be explained in more detail with reference to an embodiment shown in the drawing. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a side view of an operating unit of a textile machine for producing twill packages with a winding device, in this embodiment an automatic twill winder, in which the package frame of the winding device is equipped with a friction damper constructed according to the invention. [Diagram 2] 1 is a schematic representation, on a somewhat larger scale, of a winding device of an operating unit of a textile machine for producing twill packages, the winding device being equipped with a friction damper constructed according to the invention; [Diagram 3] 1 is a cross-sectional view of a friction damper formed in accordance with the present invention; [Figure 4] FIG. 2 illustrates a damping element of a friction damper formed in accordance with the present invention.

[0032] 1 shows a schematic side view of one working unit 2 of a textile machine for producing a traverse package, in this embodiment an automatic traverse winder 1. In the working unit 2 of such a textile machine 1, a spinning cop 3 having a comparatively small amount of yarn material produced on a ring spinning machine arranged upstream in the production process is rewound into a traverse package 5 of large volume, as is known and will not be described in detail.

[0033] Such an automatic traverse winder 1 often has a cup and tube transport system 6 in which a transport tray 11 circulates, on which the spinning cups 3 or empty tubes are arranged in a vertically oriented manner. Of this cup and tube transport system 6, only the cup feed section 24, the reversibly drivable store section 25, the transverse transport section 26 leading to the winding unit 2 and the tube return section 27 are shown in FIG. 1.

[0034] The completed trellis package 5 is normally delivered by an automatically operating service unit (not shown), preferably a trellis package changer, to a machine-length trellis package conveyor 7 from which it is transported to a package loading station or the like arranged at the machine end.

[0035] A number of identically designed working units 2 of such a textile machine 1 each have different devices, which are necessary for the orderly operation of such a textile machine. The working units 2 each have, for example, a winding device 4, which has a package frame 8, a package drive roller 9 and a yarn traverse device 10, which traverses a yarn 16 to be wound into a winding package. The package frame 8 is supported for limited movement about a pivot axis 12 extending parallel to the axis of rotation of the traverse package 5. The traverse package 5, which is rotatably held in the package frame 8, rests with its surface on the package drive roller 9 during the winding operation and is entrained by the package drive roller 9 in a frictionally coupled manner. Furthermore, in order to reduce vibrations occurring during the rolling of the cross wound package 5 during the winding process, a damping device 18 is connected to the package frame 8, which has a friction damper 20 designed according to the invention, which generates different friction forces depending on the direction, as will be explained in more detail below with reference to FIG. 3.

[0036] 1, the package drive rollers 9 are driven by separate motors, via electric motors 15 which are connected via control lines to the working unit computer 28. Preferably, the drive 14 of the yarn traverse device 10 having finger yarn guides 13, which traverse the yarn 16 to be wound onto the winding package during the winding operation, is also connected via control lines to the working unit computer 28. The working unit computer 28 is itself connected via a bus system 29 to the central control unit 30 of the automatic traverse winder 1.

[0037] The working units 2 of such an automatic traverse winder 1 typically also each comprise a yarn splicing device 21, for example a pneumatic splicer, a gripper tube 22 for handling the lower thread and a suction nozzle 17, by means of which the upper thread wound up on the traverse package 5 after a winding interruption can be received and inserted into the yarn splicing device 21.

[0038] 2 shows, in a somewhat enlarged scale, a schematic representation of a winding device 4 of an operational unit 2 of a textile machine 1 for producing twill packages, which is provided with a vibration damping device 18 constructed according to the invention. As shown, the vibration damping device 18 comprises a friction damper 20, the damper casing 31 of which is connected to the package frame 8 via a first support rod 19 and is thus movable together with the package frame 8.

[0039] As can further be seen, the brake rod 32 of the friction damper 18 is connected via a second support rod 23 to a stationary support point 33 of the working unit 2 .

[0040] The friction damper 20 of the vibration damping device 18, which is shown in detail in cross section in FIG. 3 and is constructed according to the invention, has a damper casing 31 which is provided on its upper side with a connecting thread 34 into which a first support rod 19 can be fastened, by means of which the damper casing 31 is connected in the assembled state to the package frame 8. A brake rod 32 is arranged in the damper casing 31, which is connected via a second support rod 23 to a stationary support point 33. The damper casing 31 is supported so as to be slidable with respect to the brake rod 32.

[0041] As can be seen further, the brake rod 32 is contacted by two identically designed brake elements 39, 41 in a force-locking manner. The first brake element 39 is immovably fixed in the damper housing 31, for example via a threaded bolt 40, whereas the second brake element 41 is movably supported in the damper housing 31. The damper housing 31 thus has a guide 35 of part-circular design, in which a guide and locking device 36 is arranged so as to be slidable and, if necessary, so that it can be positioned in a functionally correct manner. The guide and locking device 36 forms a rotation and support point 37 for a support lever 38, which itself is arranged at an angle relative to the brake rod 32 and is further connected to the second brake element 41 in a limitedly movably manner. As shown, the support lever 38 is further loaded by a spring element, preferably a compression spring 42, the effective pressure of which can be set by means of an adjustment screw 43.

[0042] FIG. 4 shows one of the braking elements 39, 41 which are identically formed.

[0043] The braking elements 39, 41 each have two through holes 44 for fixing the braking elements as required and a recess 45 for securely receiving replaceable brake pads 46. The first braking element 39 can thus be immovably fixed in the damper casing 31 by means of a threaded bolt 40 passing through the through holes 44. In the recess 45, a replaceable brake pad 46 can be respectively installed, i.e. a brake pad 46 that can be easily replaced as required.

[0044] Functions of the friction damper constructed according to the present invention: During the winding operation, the package frame 8 is constantly vibrated by the traverse package 5 which rests on the package drive drum 9 and is frictionally driven by the package drive drum 9. This means that the traverse package 5, which has a somewhat non-circular extension, is repeatedly lifted somewhat off the package drive drum 9.

[0045] These vibrations are transmitted via the first support rod 19 to a damper casing 31 of the friction damper 20. A brake rod 32 of the friction damper 20 is rigidly connected to a support point 33 via a second support rod 23. This means that when a respective one of the trellis winding packages 5 is lifted off its associated package drive drum 9, a lifting moment is also exerted on the damper casing 31, which is resisted by brake elements 39, 41 which contact the brake rod 32 in a force-locking manner.

[0046] In the friction damper 20 formed according to the invention, when the trellis winding package 5 is lifted, a load is applied to the damper casing 31 of the friction damper 20 formed according to the invention in such a way that a torque is applied to the angled support lever 38, as indicated by the arrow 48, which exerts an additional moment on the braking element 41, as a result of which the braking force of the braking elements 39, 41 set by the compression spring 42 is significantly increased and thus the upward deflection of the package frame 8 is significantly reduced or almost completely prevented.

[0047] On a further downward swing of the package frame 8 in the direction opposite to the so-called locking direction of the friction damper 20, the damper casing 31 is also loaded in the direction of the package drive drum 9, so that the support lever 38, which is arranged at an angle such that no additional moment is exerted on the second brake element 41 any more, is loaded, as suggested by the arrow 47. This causes a significant reduction in the braking force exerted by the brake elements 39, 41 on the brake rod 32, and the package frame 8 can be swung back into a position in which the cross wound package 5 rolls again on the package drive drum 9 in the normal way.

[0048] As is clear and as already mentioned above, the vibration damping device 18 with the friction damper 20 constructed according to the invention is of very compact design and can therefore also be used in textile machines which have been supplied with damping cylinders up until now and which have often presented some problems due to their hydraulic damping medium. Due to its compact design, no interference with possible service units occurs when using the friction damper 20 according to the invention. [Explanation of symbols]

[0049] 1 Automatic twill winder 2 Unit of Work 3. Spinning Cup 4 Winding device 5 Twill Package 6 Cup / Roller Tube Conveyor 7 Twill package conveyor 8 Package Frame 9 Package Drive Drum 10 Yarn traverse device 11 Transport tray 12 Swivel axis 13 Finger thread guide 14 Drive unit 15 Electric motor 16 Thread 17 Suction nozzle 18 Damping Device 19 First support rod 7 20 Friction Damper 21 Thread splicing device 22 Gripper tube 23 Second Support Rod 24 Cup supply section 25 Storage Section 26 Horizontal conveying section 27 Tube return section 28 Working Unit Computer 29 Bus System 30 Central Control Unit 31 Damper casing 32 Brake rod 33 Immovable Support Point 34 Connection thread 35 Partial circular guide 36 Guide and locking device 37 Rotation and support point 38 Support lever 39 First braking element 40 Threaded Bolt 41 Secondary braking element 42 Compression spring 43 Adjustment screw 44 Through hole 45 Notch 46 Brake pads 47 Arrow 48 Arrow

Claims

1. A vibration damping device (18) for a winding device (4) of a textile machine (1) for producing a twill wound package (5), for reducing vibrations occurring in a package frame (8) supported so as to be pivotable about a pivot axis (12) during a winding operation of the textile machine (1), comprising: one end of the vibration damping device (18) is connected to a package frame (8) between the traverse package (5) and the pivot axis (12), and the other end is connected to a stationary support point (33); The vibration damper (18) is configured as a friction damper (20), which has a friction force that acts with different strengths depending on the operating direction, and the friction force acting when lifting the traverse winding package (5) during the winding operation is greater than the friction force acting when returning the traverse winding package (5).

2. 2. The vibration damping device (18) according to claim 1, wherein the friction damper (20) comprises a brake rod (32) slidably supported with respect to a damper casing (31) of the friction damper (20), a first brake element (39) arranged stationarily, and a second brake element (41) movably supported and capable of being applied against the brake rod (32) by means of a movable support lever (38).

3. 3. The vibration damping device (18) of claim 2, further comprising a spring element (42) for applying a force-coupled load to the support lever (38) disposed at an angle relative to the brake rod (32).

4. 4. The vibration damping device (18) according to claim 3, characterized in that the spring element (42) is designed as a compression spring (42), the effective pressure of which can be defined and set by means of an adjustment screw (43).

5. 5. The vibration damping device (18) according to claim 2, wherein the support lever (38) is connected to the second braking element (41) in a limited movability manner on the one hand and is supported in a guide (35) of the damper casing (31) via a guide and locking device (36) on the other hand.

6. 6. The vibration damping device (18) according to claim 5, wherein the guide and locking device (36) forms a rotation and support point (37) for the support lever (38) and is supported slidably and in a definable positionable manner in the guide (35) of the damper casing (31).

7. 6. The vibration damping device (18) of claim 5, wherein the guide (35) is formed in a part-circular shape.

8. 8. The vibration damping device (18) according to claim 2, wherein the first damping element (39) and the second damping element (41) are formed identically.

9. 9. The vibration damping device (18) according to claim 8, characterized in that the braking elements (39, 41) are each provided with a through hole (40) for fastening and with a recess (45) for receiving a replaceable brake pad (46).

Images