Oscillating drive for winding device

Abstract

The invention relates to a pivot drive for a winding device for winding a thread onto a bobbin (3) in order to form a bobbin (4), and to a winding device (1). The oscillating drive (14) has a drive shaft (24) and an oscillating shaft (10) and a motor arranged in the drive shaft (24) and a first transmission stage (22) and a second transmission stage (23), the second transmission stage (23) having a transmission output in the oscillating shaft (10), the two transmission stages (22, 23) each having a crown gear (25, 29).

Description

Technical Field

[0001] The invention relates to a swivel drive for a winding device for winding a thread onto a bobbin to form a bobbin, the swivel drive comprising a frame and a bobbin spindle for holding the bobbin, wherein the bobbin spindle is held on a swivel lever which is rotatably supported on a rotation axis in the frame. Background Art

[0002] The swing drive of the type described is used in textile machines of various structural types, such as final spinning machines, rewinding machines or weft winding machines. Here, the bobbin or tube is rotatably supported between two holding arms or on the bobbin mandrel. The two holding arms or the bobbin mandrel are again held in a common swing arm with a swing axis. At the beginning of the winding process (the so-called winding stroke), the bobbin is placed on the support roller and is placed in rotation by the drive, so that the silk thread or yarn delivered between the support roller and the bobbin is wound on the bobbin and forms a bobbin. Various types of bobbins with cylindrical or conical shapes, made of different materials, such as plastic or paper, are used here. The bobbin can be constructed with or without lateral flanges. Depending on the bobbin used, the following structure of the support roller is also known, for which the support roller moves along its axis during the winding process in order to match the structural form of the bobbin. The yarn moves back and forth along the longitudinal axis of the bobbin with an oscillating mechanism during winding, thereby forming different types of windings in terms of structure and shape. The drive for the bobbin is carried out directly by a motor that rotates at least one of the bobbin receiving part or the bobbin mandrel or indirectly by a friction roller arranged parallel to the bobbin. The friction roller is used as a support roller at the same time. The friction roller can be made as a so-called grooved roller or a grooved roller. When the bobbin is driven directly, the oscillation of the thread is provided by a separate laying unit and the support of the bobbin via a separate supporting roller. The yarn is clamped between the supporting roller and the bobbin or the yarn already on the bobbin and is thus laid on the bobbin.

[0003] During the winding process, the diameter of the resulting bobbin increases continuously due to the thread wound onto the bobbin. As a result, the distance between the support roller and the longitudinal axis of the bobbin increases. Winding devices are known from the prior art, which are equipped with a pivot drive for this movement. It is also known that the pivot drive can be equipped with an angle measuring device, so that the corresponding control device knows at any time in which position the pivot drive or the bobbin is located.

[0004] CN 206692118 U discloses a swivel drive, in which the swivel shaft is indirectly driven by a motor. The movement of the motor is transmitted to the swivel arm via a belt drive. In contrast, EP 3649069A1, for example, discloses a swivel drive, which is provided with a direct drive for the swivel shaft. Here, the electric motor is coupled to the swivel shaft via a planetary screw transmission. The disadvantage here is that the swivel of the bobbin required to remove the complete bobbin must overcome the self-locking of the drive or the swivel must be performed by the drive itself.

[0005] Likewise known are winding devices for which the oscillating drive has no drive of its own, in which the tube is deflected by itself during the winding stroke about the oscillating axis by the expansion of the diameter of the bobbin. For example, EP1820764 A1 discloses such a winding device. In order to achieve a uniform movement of the oscillating arm, the tube or bobbin is pressed against the grooved drum by a pneumatic cylinder. In an alternative solution, for example, DE 19817363 A1 or US6,405,968 B2 discloses a solution for adjusting the contact force between the grooved drum and the bobbin by driving the oscillating axis via a stepper motor and applying a torque, wherein the oscillating movement of the oscillating arm is caused by the bobbin itself, which increases in diameter.

[0006] Furthermore, the known embodiments of the known wobble drives have the disadvantage that the limited reproducibility caused by their construction is produced on the one hand by their self-locking in the case of direct drives or by elasticity in the case of belt drives. Summary of the invention

[0007] The object of the present invention is therefore to provide a pivot drive for a winding device for winding a thread onto a bobbin, which pivot drive enables precise movements due to its play-free nature.

[0008] This object is achieved by a device and a method having the features of the independent claims.

[0009] A swivel drive for a winding device for winding a thread onto a bobbin for forming a bobbin is proposed, wherein the swivel drive has a drive shaft and a swivel shaft, as well as a motor arranged in the drive shaft and a first transmission stage and a second transmission stage with a transmission output in the swivel shaft, wherein a crown gear is provided in each of the two transmission stages. The transmission with the crown gear is a bevel gear transmission in terms of its structural form. In this case, a high efficiency of more than 90% can be achieved for the crown gear transmission. In the crown gear transmission, the crown gear cooperates with a cylindrical gear, thereby enabling a high reduction ratio to be achieved. The rotation of the crown gear can also be transmitted to the cylindrical gear without play via corresponding toothing, and vice versa. For example, spur gears or helical gears are used for the cylindrical gear. In addition to the play-free nature, the crown gear transmission is insensitive to slight angular offsets due to its structural type. This has the advantage that vibrations that may be transmitted from the winding device to the swivel drive have no influence on the operational reliability of the transmission stage.

[0010] The connection between the motor and the first crown gear of the first transmission stage is preferably provided by a first pinion, wherein the first pinion is connected to the rotor of the motor in a rotationally fixed manner. The first pinion and the first crown gear form the first transmission stage. The pinion is a toothed spur gear with a shaft fixedly held thereon. The shaft and the spur gear can also be integral. The toothing of the spur gear can be provided as a spur gear, a helical gear, an arc gear or a bevel gear. By inserting the pinion, a high first reduction ratio of up to 1 to 10 is achieved between the motor and the first crown gear. A second crown gear and an associated second pinion are likewise provided in the second transmission stage. A reduction ratio of up to 1 to 10 can also be achieved in the second transmission stage. By connecting the first transmission stage to the second transmission stage, a reduction ratio of up to 1 to 100 is produced for the proposed swivel drive. In this case, with a reduction ratio of, for example, 1 to 90, half a rotation of the motor is produced for a 2 degree rotation about the swivel axis. It has been found that an overall reduction ratio in the range of 1 to 16 to 1 to 64 should be preferred for the operation of the winding device. Thus, very fine changes in the position of the pivot axis are possible.

[0011] The crown gears of the first transmission stage and the second transmission stage are advantageously in operative connection via the second pinion, wherein the first crown gear of the first transmission stage and the second pinion of the second transmission stage are connected via a common shaft. The first crown gear is driven via the first spur gear of the first pinion. The first pinion and the first crown gear form the first transmission stage. The first crown gear is held rotationally fixed on a common shaft with the second pinion, so that the first crown gear and the second spur gear have the same rotation speed. A simple design is achieved via the common shaft. A coupling can be provided between the second pinion and the first crown gear. This has the advantage that the two transmission stages can be designed separately from each other or can also be replaced. In the sense of the present patent application, the shafts of the first crown gear and the second pinion that are locked by the coupling are considered to be a common shaft. The second crown gear is now driven via this second pinion or second spur gear. The shaft of the second crown gear represents the output shaft of the swivel drive. The swivel shaft of the corresponding winding device can be connected to the shaft of the second crown gear.

[0012] The motor preferably has an angle measuring device. The angle measuring device of the motor can be used to determine the exact position of the pivot shaft after conversion via the transmission stage. The control can calculate the diameter of the bobbin and the time until the bobbin is finished from the position of the pivot shaft. As an alternative, the angle measuring device can also be arranged directly on the pivot shaft, but this is less accurate because the pivot shaft is twisted by only a few minutes of angle in each case in accordance with the increasing diameter of the bobbin.

[0013] In addition, a winding device for winding a thread onto a bobbin is proposed. The winding device has at least one swing arm with a swing shaft and a tube receiving portion arranged on the swing arm and a support roller for supporting the bobbin, wherein a swing drive is provided for moving the swing arm around the swing shaft according to the above description. The tube receiving portion can be implemented in the form of a bobbin mandrel. As a support roller, a simple rotatable support roller or a driven friction roller and a grooved drum are used. In a preferred embodiment, the drive of the bobbin mandrel is arranged on a lever arm. The additional weight of the drive, which also affects the supporting force of the bobbin on the support roller, can be accepted by the corresponding movement of the swing drive. This direct drive for the bobbin mandrel replaces the indirect drive of the bobbin by means of the support roller, thereby enabling the winding speed to be adjusted without slippage. Also less loss in the form of friction and mechanical transmission is generated, which achieves less energy consumption of the bobbin drive.

[0014] Advantageously, a control device is provided in which the yarn thickness is input. If the yarn thickness is known to the control device, the necessary movement of the oscillating arm during the winding stroke can be calculated by the control device. After the winding has been placed on the bobbin, the oscillating arm is deflected by the amount of the yarn thickness. The completion of winding is known to the control device by the rotation of the bobbin and the oscillation of the thread.

[0015] Preferably, a force measuring device is provided for determining the supporting force acting on the oscillating arm. With the aid of the force measuring device, a variable is determined which is directly proportional to the supporting force of the tube or package on the support roller, taking into account mechanical facts. In this case, the supporting force between the package or package and the support roller is not directly measured, but the force acting on the oscillating arm is measured. In this case, the oscillating arm together with any drive of the package spindle and the deadweight of the package spindle itself should be taken into account in terms of their influence on the force measurement. The force which influences the force measurement changes when the diameter of the package increases due to the oscillating movement of the oscillating arm and when the horizontal distance between the package spindle and the fixed rotation axis of the oscillating arm changes accordingly.

[0016] The force measuring device can be implemented as a hydraulic or mechanical force measuring device. The force measuring device is advantageously implemented as a dynamometer arranged between two parts of the swing arm. This can achieve a simple and compact structure, and the dynamometer can also be directly coupled to the control mechanism in a simple way. In the dynamometer, different structural types of so-called force receivers can be used. For example, the use of the following force receivers is known, for which the force acts on an elastic elastic body and deforms it. The deformation of the elastic body is converted into a change in voltage by a resistance strain gauge, the resistance of which changes with the strain. The voltage is recorded by a measuring amplifier and the strain change is recorded thereby. The strain change can be converted into a force measurement value according to the elastic properties of the elastic body. As an elastic body, a bending beam, an annular torsion spring or other structural forms are used. In another structural type of the weighing cell, a piezoelectric ceramic element is used. Here, a tiny dipole is formed inside the unit cell of the piezoelectric crystal by the directional deformation of the piezoelectric material. The sum of the electric field range associated with this in all unit cells of the crystal causes a macroscopically measurable voltage, which can be converted into a force measurement value. Dynamometers are known from the prior art and are now widely used in force and weight measurement. As an alternative to the arrangement of the force measuring device in the swivel arm, the force measurement can be carried out directly on the shaft of the swivel arm. In this case, the shaft is simultaneously designed as a force introduction component of the force measuring device for the function of the swivel connection between the support and the swivel arm.

[0017] Advantageously, the movement of the swivel arm about the swivel axis is determined by the control mechanism based on the force measurement so that the supporting force of the package on the support roller is constant. Due to the constant pressure conditions during the winding process, the unwound thread length can be calculated accurately. Due to the constant supporting force, a uniform winding density is achieved over the entire winding path, thereby producing a constant ratio of yarn thickness to package diameter.

[0018] Preferably, two pivot arms are provided which have a common pivot axis and each have a tube receptacle arranged on the pivot arm and have a support roller for supporting the tube. This has the advantage that larger packages can be produced, since the forces are distributed to the two pivot arms due to the two-sided support of the tube and greater running smoothness of the package is achieved.

[0019] Preferably, the winding machine or rewinding machine is equipped with a winding device according to the above description, which makes the machine itself simple to operate and low in manufacturing cost. When the predetermined bobbin diameter is reached, the winding is stopped and the bobbin is lifted off the support roller by the swing drive. The predetermined bobbin diameter can be determined in different ways. The length of the wound thread can be determined or calculated by the winding speed and the current bobbin diameter can be inferred from it. In addition, the offset of the swing arm can also be detected by a sensor and the bobbin diameter can be inferred from it. The statement "reaching a predetermined bobbin diameter" can also refer to the pre-determination of a specific thread length, the duration of winding or the swing degree of the swing arm. If the bobbin is lifted off, it can be manually or automatically loosened after or during the clamping device of the bobbin mandrel, or manually or by means of an automatic removal device, The bobbin is removed from the bobbin mandrel. In the lifted state, the final weight of the completed bobbin can be determined by a force measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other advantages of the present invention are described in the following examples.

[0021] Figure 1 shows a schematic top view of a first embodiment of a winding device according to the present invention;

[0022] Figure 2 The winding device is shown along the Figure 1 A schematic side view in the direction X;

[0023] Figure 3 A schematic diagram of an embodiment of a wobble drive is shown; and

[0024] Figure 4 A schematic top view of a second specific embodiment of a winding device according to the invention is shown. DETAILED DESCRIPTION

[0025] Figure 1 A schematic top view of a first embodiment of a winding device 1 is shown and Figure 2 It shows that along Figure 1 Schematic side view in the direction X of the winding device for winding a thread 2 or a yarn onto a bobbin 3 for forming a bobbin 4. The winding device 1 comprises a bobbin receiving portion 5, which is rotatably supported on a swing arm 6. In the embodiment shown, the bobbin receiving portion 5 is set in rotation by a bobbin drive 7 which is also held on the swing arm 6. In the bobbin receiving portion 5, the bobbin 3 is held in a rotationally fixed manner by means of a clamping device (not shown), so that the bobbin 3 and thus the bobbin 4 on the bobbin 5 are also set in rotation 8 by the bobbin receiving portion 5. During the winding process, the bobbin 3 or the bobbin 4 is supported on a support roller 9. As an alternative to the drive form described above, the friction drive of the bobbin 3 or the bobbin 4 is carried out by the driven support roller 3. The swing arm 6 is held in a fixed position in the swing axis 10 by a corresponding support portion 12 and is rotatably supported on the frame 11. At the end of the oscillating arm 6 opposite the oscillating axis 10, the tube receiving portion 5 is fixed with the associated bobbin drive 7. The support roller 9 is rotatably held in the frame 11 in the support 13 in the embodiment shown. The support roller 9 is arranged with its axis parallel to the outer surface of the tube 3 or the bobbin 4. The oscillating arm 6 is rotated around the oscillating axis 10 by the oscillating drive 14, which results in that the distance of the tube 3 relative to the support roller 9 is changed. The tube 3 rests on the support roller 9 due to the oscillating movement 15 of the oscillating arm 6 around the oscillating axis 10 during the winding process. By the rotation 8 of the tube 3 along the corresponding rotation direction, the thread 2 laid on the tube 3 is wound onto the tube 3 and forms the bobbin 4. Here, by placing the bobbin 4 on the support roller 9, the support roller 9 is also placed in rotation along the corresponding rotation direction 16. During this winding process, the so-called winding stroke, the thread 2 is moved back and forth along the bobbin axis 19 of the tube 3 by the oscillating mechanism 17. By means of this direction of movement of the oscillating mechanism 17, various windings or bobbins 4 can be produced on the bobbin 3. By forming the windings on the bobbin 32, the bobbin 4 increases in its diameter 18, whereby the bobbin receptacle 5 and thus the swivel arm 6 swivel away from the support roller 9 about the swivel axis 10 due to the contact on the support roller 9.

[0026] During the winding process, the thread 2 is clamped between the bobbin 3 or the thread 2 already wound on the bobbin 3 and the support roller 9, so that a tightly attached winding is produced on the bobbin 3. The clamping force or supporting force 20 applied here is continuously increased due to the deadweight of the bobbin 4 which increases during the winding process. In order to ensure a constant supporting force 20, the swing arm 6 is moved around the swing axis 10 by the swing drive 14 and the bobbin 4 is thereby lifted off the support roller 9. However, this lifting is only performed to such an extent that a predetermined supporting force 20 between the bobbin 4 and the support roller 9 persists. The swing drive 14 is connected to the swing arm 6 in a rotationally fixed manner in the swing axis 10. The swing drive 14 comprises a motor 21 and a swing transmission mechanism composed of a first transmission mechanism stage 22 and a second transmission mechanism stage 23, which is arranged between the motor 21 and the swing arm.

[0027] Figure 3 The schematic diagram of an embodiment of a swivel drive 14 is shown. The swivel drive 14 comprises a motor 21 and a swivel gear having a first gear stage 22 and a second gear stage 23. In the first gear stage 22, the motor or its rotor is connected to a first pinion 26 via a drive shaft 24. The first pinion 26 has a toothed first spur gear 27 which is held in a rotationally fixed manner on the shaft. The first spur gear 27 can also be arranged integrally with its shaft and connected in a rotationally fixed manner to the drive shaft 24. The toothing of the first spur gear 27 engages in the toothing of the first crown gear 25 of the first gear stage 22. The 90-degree arrangement of the first pinion 26 shown relative to the first crown gear 25 is an example; other arrangements can also be adapted to the design requirements. The first crown gear 25 of the first gear stage is connected via a common shaft 28 with the second gear stage 23. The common shaft 28 connects the first crown gear 25 of the first gear stage 22 with the second pinion 30 of the second gear stage 23. The second pinion 30 has a toothed second spur gear 31, which engages with its toothing in the second crown gear 29 or its toothing. The second crown gear 29 of the second gear stage 23 is connected to the pivot arm 6 in a rotationally fixed manner in the pivot shaft 10. The illustrated design of the pivot gear is an example, for example, for design reasons or to increase the transmission ratio, further gear stages can be installed or the angular positions of the different shafts relative to each other can be changed.

[0028] Figure 4A schematic top view of a second embodiment of a winding device 1 is shown, which is used to wind a thread 2 or a yarn onto a bobbin 3 in order to form a bobbin 4. The winding device 1 comprises two bobbin receptacles 5 arranged opposite each other in a bobbin shaft 19, which are rotatably supported on pivot arms 6 and 33, respectively. In the embodiment shown, one of the bobbin receptacles 5 is set in rotation by a bobbin drive 7 which is also held on the pivot arm 33. The bobbin 3 is inserted between the bobbin receptacles 5 and is held in a rotationally fixed manner between the bobbin receptacles 5 by a clamping device (not shown), so that the bobbin 3 and thus the bobbin 4 located on the bobbin receptacle 5 are also set in rotation by the bobbin receptacle 5 arranged on the pivot arm 33. During the winding process, the bobbin 3 or the bobbin 4 is supported on a support roller 9. The pivot arms 6 and 33 are held stationarily by means of a pivot axis 10 via corresponding supports 12 and are rotatably supported on the machine frame. The tube receiving portion 5 together with the associated bobbin drive 7 is fixed to the end of the oscillating arm 33 opposite the oscillating axis 10. The support roller 9 is rotatably held in the frame in the support 13. The support roller 9 is arranged with its axis parallel to the outer surface of the tube 3 or the bobbin 4. The oscillating arms 6 and 33 are rotated together around the oscillating axis 10 by the oscillating drive 14, which results in that the spacing of the tube 3 relative to the support roller 9 is changed. By supporting the bobbin 4 on the support roller 9, the support roller 9 is also set in rotation and the thread 2 is wound onto the tube 3 in order to form the bobbin 2. During this winding process, the so-called winding stroke, the thread 2 is moved back and forth along the bobbin axis 19 of the tube 3 by the oscillating mechanism 17.

[0029] During the winding process, the thread 2 is clamped between the bobbin 3 or the thread 2 already wound on the bobbin 3 and the support roller 9, so that a close-fitting winding is produced on the bobbin 3. The clamping force or supporting force 20 (see Figure 2 ) due to the deadweight of the bobbin 4 which increases during the winding process. In order to ensure a constant supporting force 20, the swivel arm 6 is moved about the swivel axis 10 by the swivel drive 14 and the bobbin 4 is thereby lifted off the support roller 9. However, this lifting is only performed to such an extent that a predetermined supporting force 20 between the bobbin 4 and the support roller 9 persists. The swivel drive 14 is connected to the swivel arms 6 and 33 in the swivel axis 10 in a rotationally fixed manner.

[0030] In order to comply with the predetermined support force 20, the oscillating arm 33 is provided with a force measuring device 36. Here, the oscillating arm 33 is divided into a first sub-arm 34 and a second sub-arm 35. The force measuring device 36 connects the first sub-arm 34 with the second sub-arm 35, thereby measuring the bending force caused by the support force 20 in the oscillating arm 33. As a reaction to the support force 20 and the lifting of the package 4 by the oscillating drive 14, a change in the force against the force measuring device 35 occurs. The force measuring device 15 and the oscillating drive 14 are connected to the control device 32. The force measured by the force measuring device 35 is directly proportional to the support force 20 between the package 2 and the support roller 3. The measured force is evaluated in the control device 32 and compared with the predetermined support force. The oscillating drive 14 is adjusted accordingly by the control device 32 and the support force 20 is kept at a constant value.

[0031] The invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the claims are also possible, as are combinations of features, even if these are shown and described in different exemplary embodiments.

[0032] List of reference numerals:

[0033] 1 Winding device

[0034] 2 silk threads

[0035] 3 Bobbin

[0036] 4 bobbins

[0037] 5 Bobbin receiving part

[0038] 6 Swing arm

[0039] 7 Bobbin drive

[0040] 8 Rotation

[0041] 9 Support rollers

[0042] 10 Swing axis

[0043] 11 racks

[0044] 12Swing arm support

[0045] 13 Supporting member for supporting roller

[0046] 14 Swing drive

[0047] 15 Swinging Movement

[0048] 16 Rotation direction of support roller

[0049] 17 Oscillation mechanism

[0050] 18 bobbin diameter

[0051] 19 bobbin shaft

[0052] 20 Support force

[0053] 21 Motor for swivel drive

[0054] 22 First transmission mechanism stage

[0055] 23 Second transmission mechanism stage

[0056] 24 Drive shaft

[0057] 25First crown gear

[0058] 26First pinion

[0059] 27First cylindrical gear

[0060] 28 Common axis

[0061] 29 Second crown gear

[0062] 30 Second small gear

[0063] 31 Second cylindrical gear

[0064] 32 Control mechanism

[0065] 33 Second swing arm

[0066] 34 First sub-arm

[0067] 35 Second sub-arm

[0068] 36Force measuring device.

Claims

1. A swivel drive (14) for a winding device for winding a thread (2) onto a bobbin (3) in order to form a bobbin (4), characterized in that: The swivel drive (14) has a drive shaft (24) and a swivel shaft (10), a motor (21) arranged in the drive shaft (24), a first transmission stage (22) and a second transmission stage (23) with a transmission output in the swivel shaft (10), wherein the two transmission stages (22, 23) each have a crown gear (25, 29).

2. The swivel drive (14) according to claim 1, characterized in that The connection between the motor (21) and the first crown wheel (25) of the first transmission stage (22) is provided via a first pinion (26), wherein the first pinion (26) is connected to the rotor of the motor (21) in a rotationally fixed manner.

3. The slewing drive (14) according to at least one of the preceding claims, characterized in that The crown gears (25, 29) of the first transmission stage (22) and the second transmission stage (23) are in operative connection via a second pinion (30), wherein the first crown gear (25) of the first transmission stage (22) and the second pinion (30) of the second transmission stage (23) are connected via a common shaft (28).

4. The slewing drive (14) according to at least one of the preceding claims, characterized in that The motor (21) has an angle measuring device.

5. A winding device (1) for winding a thread (2) onto a bobbin (3), comprising at least one pivot arm (6) with a pivot axis (10), a bobbin receptacle (5) arranged on the pivot arm (6), and a support roller (9) for supporting the bobbin (3), characterized in that: A swivel drive (14) is provided for moving (15) a swivel arm (6) about a swivel axis (10) according to one of the preceding claims.

6. The winding device (1) according to claim 5, characterized in that A control device (32) is provided, wherein an input of the yarn thickness is provided in the control device (32).

7. The winding device (1) according to claim 5, characterized in that A force measuring device (36) is provided for measuring a support force (20) acting on the pivot arm (33).

8. The winding device (1) according to claim 7, characterized in that The pivoting movement (15) of the pivot arm (33) about the pivot axis (10) is determined by the control device (32) as a function of the supporting force (20), so that the supporting force (20) of the package (4) on the supporting roller (9) is constant.

9. A winding device (1) according to at least one of claims 5 to 8, characterized in that Two pivot arms (6, 33) are provided, which have a common pivot axis (10) and each have a tube receptacle (5) arranged on the pivot arm (6, 33) and a support roller (9) for supporting the tube (3).

10. Winding machine having at least one winding device (1) according to at least one of claims 5 to 9.

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