JP3623171B2 - Winding core chuck device for winding shaft - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a winding shaft for winding a web material such as paper or plastic film around a hollow winding core, and more particularly to a winding core chuck device for the winding shaft.
[0002]
[Prior art and its problems]
A friction drive type is used as the winding shaft of the slitter. That is described in Japanese Patent Publication No. 60-30621. In the winding shaft of this publication, a ring-shaped friction plate is concentrically arranged around the winding shaft, a tapered inclined surface is formed on the outer peripheral surface of the friction plate, and a plurality of chips are spaced around the friction plate. Is placed and engages the inclined surface. Furthermore, the piston is inserted into the inner hole of the cylinder block, air pressure is supplied to the inner hole of the cylinder block through the internal flow path of the winding shaft, the piston is pressed against the end surface of the friction plate, and the inclined surface of the friction plate Thus, each chip moves in the radial direction of the take-up shaft, is expanded, and is pressed against the inner peripheral surface of the take-up core, whereby the take-up core is chucked. Further, due to the friction between the piston and the friction plate, the torque of the winding shaft is transmitted to the friction plate, the tip and the winding core, whereby the winding core rotates and the web material is wound on the winding core.
[0003]
By the way, in this winding shaft, it is the inclined surface of the friction plate that presses each chip against the inner peripheral surface of the winding core, and the air pressure in the inner hole of the cylinder block. For this reason, in particular, when the air pressure in the inner hole of the cylinder block is small, there is a problem that each chip cannot be pressed against the inner peripheral surface of the winding core to reliably chuck the winding core.
[0004]
On the other hand, recently, it has been required to wind up a stretchable material such as a thin film so as not to stretch as much as possible. In order to achieve this, it is necessary to take up the material with a small take-up tension, but in the case of this take-up shaft, it is the torque transmitted to the take-up core that is related to the take-up tension. It is the friction of the friction plate. This is determined by the air pressure in the inner hole of the cylinder block. The smaller the air pressure, the smaller the friction, the smaller the torque, and the lower the winding tension. However, as described above, when the air pressure is low, the winding core cannot be reliably chucked. As a result, there is a limit to reducing the air pressure, and the web material has a low winding tension. There was a problem that it was difficult to wind up.
[0005]
OBJECT OF THE INVENTION
Accordingly, an object of the present invention is to provide a new configuration of a take-up core chuck device for a take-up shaft so that the take-up core is reliably chucked.
[0006]
The other purpose is to be able to wind up web materials such as paper and plastic film with a large winding tension on a winding shaft of a friction drive system. Even if there is, it is to be able to wind it up accurately.
[0007]
[Structure of the invention]
According to this invention, the ring-shaped holder is disposed concentrically around the take-up shaft, and a plurality of receiving grooves are formed on the outer peripheral surface of the holder at intervals in the circumferential direction. The housing groove extends in the axial direction of the winding shaft. In addition, a plurality of pawls are housed in each housing groove. The claw has a teardrop-shaped cross section , has a pointed end and an arc surface, and the pointed edge extends in the axial direction of the winding shaft. Arc surface also Ru extending in the axial direction of the winding shaft. Further, the receiving groove has a bottom surface having a shape corresponding to the arc surface, and the arc surface engages with the bottom surface of the receiving groove. Further, the elastic means acts on each pawl, each pawl stands in the radial direction of the take-up shaft, and its sharp edge projects from the outer peripheral surface of the holder. Accordingly, the pawls are guided to the bottom surface of the housing groove, and can stand and tilt along the bottom surface, so that the pawls can bite into the inner peripheral surface of the winding core, thereby chucking the winding core. .
[0008]
In a preferred embodiment, each pawl is inclined at a certain angle in the same direction as the rotation direction of the winding shaft in the standing position of the pawl, and the pawl is in the same direction as the rotation direction of the winding shaft around the center line of the arc surface. Can be tilted.
[0012]
Further, a bearing is provided between the holder and the winding shaft, and the holder can rotate around the winding shaft. The torque of the take-up shaft is transmitted to the holder, the pawl and the take-up core by the friction, whereby the take-up core rotates.
[0013]
[Explanation of Examples]
Examples of the present invention will be described below.
[0014]
In FIG. 1, this is a winding core chuck device of the winding shaft 1. The take-up shaft 1 is of a friction drive type, and at a plurality of take-up core chucking positions set at intervals in the axial direction of the take-up shaft 1, the collar 2, the bearing 3, the holder 4 and the friction plate 5, respectively. Is provided in the same manner as that disclosed in Japanese Patent Publication No. 60-30621. The take-up shaft 1 can rotate around its axis and is connected to a drive motor. The holder 4 is ring-shaped and is concentrically arranged around the take-up shaft 1. A bearing 3 is provided between the holder 4 and the take-up shaft 1. The holder 4 can rotate around the take-up shaft 1. It is. The friction plate 5 is also ring-shaped and is arranged concentrically around the winding shaft 1. Further, the friction plate 5 and the holder 4 are connected by pins, and the holder 4 rotates integrally with the friction plate 5. The cylinder block 6 is also disposed between adjacent pairs of winding core chucking positions as in the publication. The cylinder block 6 is also ring-shaped and fitted to the outer peripheral surface of the winding shaft 1. Furthermore, the piston 7 is inserted into the inner hole of the cylinder block 6, faces the end surface of the friction plate 5, and air pressure passes through the inner flow path 8 of the winding shaft 1 and is supplied to the inner hole of the cylinder block 6. Is the same as that of the publication.
[0015]
Furthermore, in this winding shaft, as shown in FIG. 2, a plurality of receiving grooves 9 are formed on the outer peripheral surface 10 of the holder 4 at intervals in the circumferential direction. The housing groove 9 extends in the axial direction of the winding shaft 1. Further, a plurality of claws 11 are accommodated in the respective accommodating grooves 9. The pawl 11 has a teardrop-shaped cross section of a certain length L, and has a sharp edge 12 and an arc surface 13, the sharp edge 12 extends in the axial direction of the take-up shaft 1, and the arc surface 13 is also an axis of the take-up shaft 1. Extend in the direction. As shown in FIG. 3, the storage groove 9 has a bottom surface 14 having a shape corresponding to the circular arc surface 13, and the circular arc surface 13 engages with the bottom surface 14 of the storage groove 9. Further, the accommodation groove 9 is opened in the outer peripheral surface 10 of the holder 4, and the opening width W thereof is smaller than the diameter D of the arc surface 13 and the bottom surface 14. Therefore, the pawl 11 is held in the housing groove 9, and the pawl 11 does not come out of the housing groove 9 in the radial direction of the winding shaft 1. Further, the end surface of the holder 4 is covered with the cover 15, and the cover 15 and the holder 4 are coupled and fixed by screws, and the pawl 11 is disposed between the friction plate 5 and the cover 15 in the axial direction of the winding shaft 1. Is held.
[0016]
Further, the elastic means acts on each pawl 11, each pawl 11 rises in the radial direction of the winding shaft 1, and its sharp edge 12 protrudes from the outer peripheral surface 10 of the holder 4. The elastic means comprises a ring-shaped coil spring or spring piano wire 16, is provided around the pawl 11 and the holder 4, and is fitted into the circumferential groove 17 of the holder 4. Further, as shown in FIGS. 4 and 5, the flat surface 18 is formed along the center line C of the arc surface 13 at one end portion of the pawl 11, and the flat surface 18 is connected to the center line C of the arc surface 13. It extends at right angles to a plane P passing through the sharp edge 12. Further, an engagement portion 19 is formed by chamfering at one side edge of the flat surface 18, and the coil spring or the spring piano wire 16 is engaged with the engagement portion 19. The engaging portion 19 is a slope having a constant angle.
[0017]
Further, in this device, at the standing position of the pawls 11, the pawls 11 are inclined at a constant angle α in the same direction as the rotation direction X of the winding shaft 1, and the pawls 11 are wound around the center line C of the arcuate surface 13. It can be tilted in the same direction as the rotation direction X of the spindle 1. In this embodiment, one wall surface 20 of the housing groove 9 is inclined at an equivalent angle in the same direction as the rotation direction X of the winding shaft 1, and the pawl 11 is engaged with one wall surface 20 of the housing groove 9, Inclined by a constant angle α in the same direction as the rotation direction X of the spindle 1 and maintained in that state. Further, the other wall surface 21 of the accommodation groove 9 is also inclined at an equivalent angle in the same direction as the rotation direction X of the winding shaft 1, and the pawl 11 rotates the winding shaft 1 around the center line C of the arcuate surface 13. It tilts in the same direction as the direction X and engages with the other wall surface 21 of the housing groove 9.
[0018]
Therefore, with respect to the standing direction of the pawl 11, the coil spring or the spring piano wire 16 is engaged with the engaging portion 19 of the pawl 11, and the pawl 11 stands up in the direction opposite to the rotation direction X of the winding shaft 1. In this regard, however, the engaging portion 19 is located on the upright side of the pawl 11 on both sides of the plane P 0 passing through the center line C of the arcuate surface 13 and the sharp edge 12. Further, the engaging portion 19 is always located on the opposite side of the sharp edge 12 on both sides of the plane P1 passing through the center line C of the arc surface 13 and the center line of the winding shaft 1. Accordingly, the engaging portion 19 is pressed by the coil spring or the spring piano wire 16 and the sharp edge 12 of the pawl 11 stands up smoothly. The engaging portion 19 is made of a chamfered slope, and the engaging portion 19 does not damage the coil spring or the spring piano wire 16.
[0019]
Further, in this embodiment, at one end portion or both end portions of the pawl 11, the sharp edges 12 and the corners of the end surface of the pawl 11 are cut obliquely, thereby forming a cam surface 22. The cam surface 22 is inclined so that the distance from the center line C of the circular arc surface 13 increases as the pawl 11 is inclined. The inclined state continues at least beyond the plane P0 passing through the center line C and the sharp edge 12 of the arc surface 13.
[0020]
Further, in this embodiment, a plurality of balls 23 are rotatably accommodated in a plurality of cases 24, and each case 24 is spaced around the take-up shaft 1 between adjacent pairs of take-up core chucking positions. Each ball 23 protrudes from the outer surface of each case 24. Further, in this embodiment, the cases 24 are arranged at an angular interval of 45 °, embedded in the cylinder block 6, attached and fixed, and the balls 23 protrude slightly from the cylinder block 6. Further, a large number of small balls 25 are spread in each case 24, and the ball 23 is in contact with each small ball 25 and is rotatably accommodated.
[0021]
This device is an accessory device of the slitter. In the slitter, a plurality of winding cores 26 are arranged around the winding shaft 1 at intervals in the axial direction of the winding shaft 1, and a web material such as paper or plastic film is guided to a slit blade, and a plurality of strips are wound. And is guided to each winding core 26. The winding core 26 is made of a paper tube.
[0022]
The diameter of the outer peripheral surface 10 of the holder 4 is slightly smaller than the inner peripheral surface of the winding core 26. Furthermore, when each pawl 11 stands in the radial direction of the winding shaft 1 and its sharp edge 12 protrudes from the outer peripheral surface 10 of the holder 4, the sharp edge 12 is slightly smaller than the inner peripheral surface of the winding core 26. Located on a large circle.
[0023]
Therefore, in this apparatus, when the winding core 26 is arranged around the winding shaft 1, when the winding core 26 is pushed in the axial direction of the winding shaft 1, the end surface of the winding core 26 faces the pawls 11. The inner peripheral edge engages with the cam surface 22 of the pawl 11. Accordingly, each pawl 11 receives the pushing force of the take-up core 26, and the cam surface 22 generates a component force, and each pawl 11 is tilted by the component force. The pawl 11 tilts in the same direction as the rotation direction X of the winding shaft 1. As a result, the protruding amount of the sharp edge 12 is reduced, and the take-up core 26 gets over each pawl 11 and is pushed in as it is, and is arranged at a predetermined position. Thereafter, each pawl 11 is elastically biased by a coil spring or a spring piano wire 16, and each pawl 11 rises in the radial direction of the winding shaft 1 and is pressed against the inner peripheral surface of the winding core 26.
[0024]
Next, when air pressure is supplied to the inner hole of the cylinder block 6, the piston 7 is pressed against the end surface of the friction plate 5. Therefore, when the winding shaft 1 is rotated by the drive motor, friction is generated between the piston 7 and the friction plate 5, and the torque of the winding shaft 1 is transmitted to the friction plate 5, the holder 4 and the winding core 26 by the friction. As a result, the friction plate 5, the holder 4, and the winding core 26 are rotated. Further, as the holder 4 rotates, each pawl 11 stands up completely and bites into the inner peripheral surface of the winding core 26, whereby the winding core 26 is chucked. Thereafter, the pawl 11 is engaged with one wall surface 20 of the housing groove 9, is inclined by a certain angle α in the same direction as the rotation direction X of the winding shaft 1, and is maintained in this state. Therefore, the take-up core 26 can be reliably chucked and rotated integrally with the friction plate 5 and the holder 4, and the web material can be taken up on the hollow take-up core 26.
[0025]
In the case of this device, torque is transmitted to the winding core 26 by the friction between the piston 7 and the friction plate 5, and torque is transmitted to each winding core 26. Therefore, each winding core 26 can be driven and rotated independently of each other. Further, although the torque transmitted to the winding core 26 is related to the winding tension of the web material, the magnitude of the friction and torque is determined by the air pressure supplied to the inner hole of the cylinder block 6. . Therefore, the friction and torque can be adjusted by the air pressure. Furthermore, even if the air pressure is small, the pawls 11 can be bitten into the inner peripheral surface of the winding core 26 regardless of the air pressure, and the winding core 26 can be reliably chucked. As a result, the web material can be wound with a large winding tension, can be wound with a small winding tension, and any material can be accurately wound.
[0026]
Further, after the winding of the web material is completed, when the wound product is slightly rotated in the rotation direction X of the winding shaft 1 or when the winding shaft 1 is slightly rotated in the opposite direction, each pawl 11 is wound. The winding core 26 is released from the inner peripheral surface of the core 26, thereby releasing the winding core 26, and the wound product is supported on the balls 23. Therefore, when the take-up product is pulled out from around the take-up shaft 1 and taken out, the ball 23 is interlocked with the take-up product between each take-up core chucking position, rotates in the case 24, and takes up a large weight. Even if it is a product, its resistance is reduced by the balls 23, and the wound product can be easily pulled out and taken out.
[0027]
When the web material is wound around the winding core 26, it is the friction between the piston 7 and the friction plate 5 that rotates the winding core 26. Therefore, the winding core 26 does not rotate integrally with the cylinder block 6, but there is no problem. Even if the take-up core 26 is deformed or distorted, the inner peripheral surface of the take-up core 26 engages with each ball 23, thereby rotating the ball 23. The cylinder block 6 causes the inner peripheral surface of the take-up core 26 to be rotated. There is no risk of rubbing and damaging, and the inner peripheral surface of the winding core 26 is protected by the balls 23, which is preferable. It is also conceivable to attach each case 24 to the friction plate 5 instead of the cylinder block 6. In this case, when the web material is wound around the winding core 26, the winding core 26 is integrated with the friction plate 6. Even if it rotates and the inner peripheral surface engages with each ball | bowl 23, the ball | bowl 23 does not rotate by it and there is no problem of a noise, and it is preferable. The winding core 6 may be rotated integrally with a plate that does not generate friction, and each case 24 may be attached to the plate.
[0028]
【The invention's effect】
As described above, according to the present invention, the winding core 26 can be reliably chucked. In addition, the web material can be wound with a large winding tension, and can be wound with a small winding tension, so that any material can be accurately wound. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the apparatus of FIG.
FIG. 3 is a front view of the holder of FIG. 2;
FIG. 4 is an enlarged view of a nail of FIG.
FIG. 5 is a front view of a pawl in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Winding shaft 4 Holder 9 Accommodating groove 10 Outer peripheral surface 11 Claw 12 Pointed edge 13 Arc surface 14 Bottom surface 16 Coil spring or spring piano wire 19 Engagement part 22 Cam surface 26 Winding core

Claims (3)

A ring-shaped holder concentrically arranged around the winding shaft;
A plurality of housing grooves formed on the outer peripheral surface of the holder at intervals in the circumferential direction and extending in the axial direction of the winding shaft;
A plurality of claws having a teardrop-shaped cross section having a sharp edge and an arc surface extending in the axial direction of the take-up shaft and housed in each of the housing grooves ;
The receiving groove has a bottom surface corresponding to the arc surface, the arc surface is engaged with the bottom surface of the receiving groove;
Elastic means for raising each of the pawls in the radial direction of the winding shaft and projecting the sharp edges from the outer peripheral surface of the holder ;
The pawls are guided by the bottom surface, and can stand and tilt along the bottom surface, and the pawls bite into the inner peripheral surface of the winding core, thereby chucking the winding core. A take-up core chuck device for a take-up shaft. In the standing position of the pawl, each pawl is inclined at a certain angle in the same direction as the rotation direction of the winding shaft, and the pawl is in the same direction as the rotation direction of the rotation shaft around the center line of the arc surface. The winding core chuck device according to claim 1, wherein the winding core chuck device can be tilted. A bearing is provided between the holder and the take-up shaft, and the holder is rotatable around the take-up shaft, and the torque of the take-up shaft is applied to the holder, the pawl and the take-up core by friction. The take-up core chuck device according to claim 1 or 2 , wherein the take-up core is transmitted and thereby the take-up core rotates.

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