JPH10120255A - Friction winding shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction winding shaft that can hold a core positively in a specified position even in a rotation stop state while being simple in structure, easy to machine and assemble and convenient to obtain a long one. SOLUTION: A claw member 9 with an engaging part 9a that can be engaged with the inner periphery of a winding core C fitted to the periphery of a cylindrical member 5 is accommodated out of falling in a recessed part 8 formed at the periphery of the cylindrical member 5, and a spring device 11 for energizing the claw member 9 so that the engaging part 9a advances out of the recessed part 8 is provided in the recessed part 8. A push-back device 12 for pushing back the claw member 9 upon receiving compressed air is provided being spaced in the circumferential direction of the cylindrical member 5 from the spring device 11. A pore 27 for supplying compressed air to the push-back device 12 from the inner peripheral side of the cylindrical member 5 is provided in the cylindrical member 5, and a pair of sealing rings 28 for closing a clearance between the inner peripheral surface of the cylindrical member 5 and the outer peripheral surface of a center shaft are disposed in the state of holding the pore 27 in between. The center shaft 1 is provided with a passage for leading compressed air into a space surrounded by a pair of sealing rings 28, the inner peripheral surface of the cylindrical member 5 and the outer peripheral surface of the center shaft 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction winding shaft to which a tubular core for winding a belt-like sheet is mounted.

[0002]

2. Description of the Related Art Generally, a friction winding shaft is formed by a plastic film, a slitter rewinder or the like.
It is used when a wide band-shaped sheet such as a thin sheet of paper or metal is divided into a plurality of narrow sheets, and the divided narrow sheets are simultaneously wound. The friction winding shaft is rotatably driven during winding of the belt-shaped sheet, a number of cylindrical members rotatably and concentrically mounted on the outer periphery of the center shaft, and frictionally engages with the cylindrical member. A friction engagement mechanism for transmitting the rotation of the central shaft to the cylindrical member with a required torque, and a core fixing mechanism for fixing the core fitted to the outer periphery of the cylindrical member to the cylindrical member.

As a conventional core fixing mechanism for a friction winding shaft, for example, as described in Japanese Utility Model Publication No. 63-33869, an inclined groove is formed on the outer periphery of a cylindrical member at circumferential intervals. A steel ball is rolled in the inclined groove, and the steel ball is rolled to a shallow portion of the inclined groove by a relative rotation between the core and the cylindrical member, and a part of the steel ball is inclined. , And is configured to push up the inner periphery of the core. In this core fixing mechanism,
The projecting power of the steel ball changes according to the relative rotational force between the core and the cylindrical member. The greater the relative rotational force, the greater the protruding force of the steel ball, and the greater the force of fixing the core to the cylindrical member. Further, since the mechanical strength of the central shaft can be increased by reducing the thickness of the cylindrical member, a relatively long friction winding shaft can be obtained.

[0004]

However, in the friction winding shaft having the above-described core fixing mechanism, the relative rotation force between the core and the cylindrical member cannot be maintained unless the friction winding shaft is driven to rotate. The core is not securely held. for that reason,
For example, when the winding operation is interrupted before the completion of the sheet roll, the winding core may be displaced in the longitudinal direction, and if the winding operation is restarted in this state, winding failure will occur.

[0005] In order to prevent the core from losing its core fixing force even when the winding shaft is in a stopped state, the shaft is compressed by compressed air or a spring as disclosed in Japanese Patent No. 2515159. The movable member is pressed in one direction of the longitudinal direction of the center, and the gripping body is pushed up by an inclined surface formed on the outer periphery of the movable member to expand in a diametrical direction, and the core is gripped by the expanded gripping body. It is conceivable to employ a core fixing mechanism.

However, in this case, since the winding core fixing mechanism is complicated and has a structure in which compressed air easily leaks, the winding shaft is very difficult to process and requires much time for assembling. Further, since the width of the cylindrical member is increased, it is not suitable for a friction winding shaft in which the width of each cylindrical member needs to be reduced. Further, since the thickness from the outer periphery of the center shaft to the outer periphery of the core fixing mechanism is increased, it is necessary to reduce the outer diameter of the center shaft in order to mount a core having the same inner diameter as the conventional one. Many of the existing slitter rewinders use a long friction winding shaft, and even if an attempt is made to adopt a type equipped with a core fixing mechanism of the above-described type as the winding shaft of such a slitter rewinder, the center shaft is Since the required mechanical strength cannot be obtained due to the small outer diameter,
There is a problem that it cannot be done. In order to obtain the required mechanical strength in a winding shaft having a core fixing mechanism of the above-described type, the outer diameter of the cylindrical member may be increased without decreasing the outer diameter of the central shaft. It is no longer possible to use a core with the same inner diameter as before, and if you change the inner diameter of the core, you must change the outer diameter of all the reels of other devices that handle sheet rolls wound using that core. Will not be.

[0007]

According to the present invention, a depression is formed on the outer periphery of a cylindrical member, and an engagement portion engageable with the inner periphery of a core fitted on the outer periphery of the cylindrical member is formed in the depression. A spring device for urging the claw member such that the engaging portion advances from the recessed portion, and further presses the claw member back in response to the compressed air; A push-back device is provided at a distance from the spring device in the circumferential direction of the cylindrical member. Then, a small hole for supplying compressed air to the push-back device from the inner peripheral side of the cylindrical member is provided in the cylindrical member, and the gap between the inner peripheral surface of the cylindrical member and the outer peripheral surface of the central shaft is closed so as to sandwich the small hole. And a passage for guiding compressed air to a space surrounded by the pair of sealing rings, the inner peripheral surface of the cylindrical member, and the outer peripheral surface of the central shaft is provided on the central shaft.

When compressed air is not supplied to the passage formed in the central shaft, the spring device directly pushes the claw member to cause the engaging portion to advance from the depressed portion, and the spring device moves to the inner periphery of the core on the cylindrical member. The core is fixed by pressing the engagement portion.

When compressed air is supplied to the passage formed in the central shaft, the compressed air flows from the passage through a small hole formed in the cylindrical member to the push-back device, and operates the push-back device. The actuated push-back device pushes back the claw member against the urging force of the spring device, thereby retreating the engaging portion of the claw member from the inner periphery of the core to the depression, thereby releasing the fixation of the core.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A friction winding shaft according to the present invention comprises a plurality of cylindrical members rotatably mounted on a center shaft via bearings, and a friction engagement mechanism for frictionally engaging the center shaft and the cylindrical member. The friction winding shaft includes a recess formed on the outer periphery of the cylindrical member, an engaging portion engageable with the inner periphery of the core fitted on the outer periphery of the cylindrical member, and is housed in the recess so as not to fall off. A claw member, a spring device provided in the recess for urging the claw member so that the engaging portion of the claw member advances from the recess, and a depressed portion in the circumferential direction of the cylindrical member with respect to the spring device. A push-back device provided in the portion for receiving the compressed air and pushing back the claw member, a small hole provided in the cylindrical member for guiding the compressed air from the inner peripheral side of the cylindrical member to the push-back device, and a small hole provided in the cylindrical member. The gap between the inner peripheral surface of the cylindrical member and the outer peripheral surface of The compressed air supplied to the ends of the central shaft and the pair of sealing rings for closing the shaft is guided to a space surrounded by the pair of sealing rings, the inner peripheral surface of the cylindrical member, and the outer peripheral surface of the central shaft. And a passage provided on a central shaft for the

In the friction winding shaft of the present invention, the claw member extends in a circumferential direction of the cylindrical member and is pivotally supported by a pin attached to the cylindrical member. It preferably comprises a piston for pushing up the side and a hole of the required depth formed in the depression for accommodating the piston.

The claw member has an arm extending in the circumferential direction of the cylindrical member, and the push-back device is formed of an expansion and contraction member provided above the arm of the claw member and expandable by compressed air. In addition, a cover plate having a hole through which the engaging portion of the claw member can advance may be attached to the outer periphery of the cylindrical member so as to cover the opening of the depression.

Further, the center shaft is hollow, and the friction engagement mechanism is provided with a radial hole communicating with the hollow portion in the center shaft corresponding to each cylindrical member, and a push-up rod is provided in the hole. Each of the pair of sealing rings is formed by inserting a tube that can be expanded and contracted by compressed air into the hollow portion of the central shaft, and as a passage for supplying compressed air between the pair of sealing rings. It is effective to use the space between the inner circumference and the outer circumference of the tube and the hole.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a schematic front view of a friction winding shaft, and FIG.
2 is a sectional view taken along the line AA in FIG. 3, and FIG.
It is a front view which shows the principal part cross section by. In FIG. 1, a center shaft 1 has a bearing 3 between the machine frames 2 and 2 during winding of a belt-shaped sheet.
And both ends are supported by the center device 4 and can be rotationally driven by a rotational drive mechanism (not shown).
A large number of cylindrical members 5 are provided on the outer periphery of the central shaft 1 as shown in FIG.
As shown in the figure, the pair is rotatably mounted via a pair of rolling bearings 6,6. A small gap is provided between the rolling bearings 6, 6 of the adjacent cylindrical members 5, 5 with a ring 7 interposed therebetween.

As shown in FIG. 1, a tubular core C (indicated by a two-dot chain line) for winding a belt-like sheet is mounted on the outer periphery of the cylindrical member 5. To mount the core C, the center shaft 1 is pulled out to the bearing 3 side, and in this state, the core C is fitted from one end of the center shaft 1 to the outer periphery of the cylindrical member 5 and moved to a required position and fixed.

In order to fix the core C fitted on the outer periphery of the cylindrical member 5 on the cylindrical member 5, a depression 8 is formed on the outer periphery of the cylindrical member 5 as shown in FIG. In this embodiment, the depressions 8 are arranged at equal intervals at three positions in the circumferential direction of the cylindrical member 5, and each of the depressions 8 accommodates a claw member 9 extending in the circumferential direction of the cylindrical member 5. Then, it is pivotally supported by a pin 10 attached to the cylindrical member 5. A spring device 11 is provided inside the depression 8 near one end in the circumferential direction of the cylindrical member 5.
And a push-back device 12 inside the depression 8 near the other end in the circumferential direction of the cylindrical member 5.

The claw member 9 has an engaging portion 9a that engages with the inner periphery of the core C. When the claw member 9 is tilted about the pin 10, the engaging portion 9a moves outward from the recessed portion 8. It is possible to advance to. The engaging portion 9a of the claw member 9 is provided with a projection for securing the core C securely. The engaging portion 9a may have, for example, a knurled surface on its surface in order to increase the engaging force with the inner periphery of the core C.

The spring device 11 includes a hole 13 having a required depth formed in the depression 8 and a compression coil spring 14 inserted in the hole 13.
And the press fitting 1 attached to the upper end of the compression coil spring 14
The pressing member 15 is applied to the lower surface of the engaging portion 9a of the claw member 9, and the claw member 9 is pushed up and urged so that the engaging portion 9a moves outward from the recessed portion 8.

The push-back device 12 is provided with the pin 1 of the claw member 9.
Piston 16 for pushing up the end opposite to the engaging portion 9a with respect to the piston 0;
The hole 17 has a required depth formed therein. This hole 17 is formed from the outer peripheral side of the cylindrical member 5 and the inner peripheral surface is
It is finished so that it can reciprocate smoothly while maintaining airtightness.

The friction winding shaft of the present invention has a friction engagement mechanism 18 for frictionally engaging the central shaft 1 with the cylindrical member 5 and transmitting the rotation of the central shaft 1 to the cylindrical member 5 with a required torque. In this embodiment, the frictional engagement mechanism 18
In addition, radial holes 19 communicating with the hollow portions 1a are provided corresponding to the respective cylindrical members 5, and push-up rods 20 are loosely inserted into the holes 19, and the hollow portions of the central shaft 1 are expanded by compressed air. Then, a rubber tube 21 that contracts when the compressed air is removed is inserted.

The push-up bar 20 is provided with a small-diameter portion 22 on its outer periphery so that it does not fall out of the hole 19 into the hollow portion of the central shaft 1, and the small-diameter portion 22 is slightly larger than the inner diameter of the hole 19. A snap ring 23 having an outer diameter and a sufficiently larger inner diameter than the outer diameter of the small diameter portion 22 is attached, and in this state, the snap ring 23 and the snap ring 23 are inserted into the hole 19.
2 is sufficiently larger than the thickness of the snap ring 23. Therefore, the snap ring 23 elastically presses the inner peripheral surface of the hole 19, and the push-up bar 20 is retained in the hole 19 by the frictional force generated thereby, and moves in the axial direction with respect to the snap ring 23. be able to.

At the end of the central shaft 1, a rotary joint 24 is attached as shown in FIG. 1 to separately supply the compressed air to the tube 21 and the compressed air to the piston 16 to the central shaft 1. With the rotary joint 24
And a rotary joint 24, which communicates the space between the inner circumference of the central shaft 1 and the outer circumference of the tube 21. Instead of using the rotary joint 24 for two circuits, a rotary joint for supplying compressed air to the tube 21 and a conduction hole are provided at one end of the central shaft 1, and a piston is provided at the other end of the central shaft 1. Alternatively, a rotary joint and a conduction hole for supplying compressed air to 16 may be provided.

The space between the inner circumference of the central shaft 1 and the outer circumference of the tube 21 and the hole 19 into which the push-up rod 20 is inserted
Is used as a passage for guiding the compressed air supplied from the introduction hole 26 to the outer periphery of the central shaft 1. As shown in FIG. 3, the cylindrical member 5 is provided with a small hole 27 communicating from the inner peripheral side to the bottom of the hole 17, and a gap between the inner peripheral surface of the cylindrical member 5 and the outer peripheral surface of the central shaft 1 is provided. A pair of sealing rings 28, 28 for closing the small holes 27 are provided so as to sandwich the small holes 27. The compressed air guided from the hole 19 to the outer periphery of the central shaft 1 is supplied to the hole 17 through the small hole 27 and pushes up the piston 16.

In the above-described friction winding shaft, when compressed air is not supplied to the introduction hole 26, the pawl member 9 is tilted by the urging force of the spring device 11 as shown by a two-dot chain line in FIG. Is pushed down, and the engaging portion 9a protrudes from the outer periphery of the cylindrical member 5. Thereby, the engaging portion 9 a is pressed against the inner periphery of the core C fitted on the outer periphery of the cylindrical member 5, and the core C is fixed to the cylindrical member 5.

The introduction hole 26 through the rotary joint 24
Is supplied from the space between the inner periphery of the central shaft 1 and the outer periphery of the tube 21 to the pair of sealing rings 15 on the outer periphery of the central shaft 1 through the gap between the hole 19 and the push-up rod 20. , 15 and flow into the hole 17 via the small hole 27 to push up the piston 16. The pushed-up piston 16 pushes the claw member 9 on the side opposite to the engaging portion 9 a with respect to the pin 10, inclines the claw member 9, and retreats the engaging portion 9 a to the recessed portion 8. Thereby, the fixing of the core C is released.

When compressed air of a required pressure is supplied to the introduction hole 25 through the rotary joint 24, the compressed air reaches the tube 21 and pushes up the push-up bar 20, and the upper end of the push-up bar 20 is connected to the cylindrical member 5. A required force is applied to the inner peripheral surface to frictionally engage. During the winding of the belt-shaped sheet, compressed air is not supplied to the introduction hole 26, and the compressed air in the introduction hole 26 is discharged to the outside through the rotary joint 24. It does not affect the torque.

In order to wind the belt-shaped sheet using the above-mentioned friction winding shaft, first, in order to mount the winding core C, compressed air is supplied to the introduction hole 26 of the center shaft 1 and the claw member 9 is moved by the piston 16. 3 is inclined against the urging force of the spring device 11 as shown by the solid line in FIG.
Is retracted to the depression 8.

Next, the winding core C is fitted on the outer periphery of the cylindrical member 5,
Thereafter, the supply of compressed air to the introduction hole 26 is stopped, and the core C
Is fixed on the cylindrical member 5.

Next, the front end of the belt-shaped sheet is locked on the core C to drive the center shaft 1 to rotate, and the center shaft introduction hole 2
Compressed air is supplied to the cylindrical member 5 so that the cylindrical member 5 and the central shaft 1 are frictionally engaged with each other, and the rotation of the central shaft 1 is transmitted to the cylindrical member 5 with a torque corresponding to the frictional engagement force to rotate the core C.

After the winding is completed, to remove the sheet roll, compressed air is supplied to the introduction hole 26, the piston 16 is operated, the engaging portion 9a of the claw member 9 is retracted, and the fixing of the core C is released. Then, the sheet roll together with the core C is removed from the friction winding shaft.

FIG. 4 shows a second embodiment of the present invention. In this embodiment, a depression 8 formed from the outer periphery of the cylindrical member 5 has
The claw member 9 having the arm 31 extending obliquely downward in the circumferential direction of the cylindrical member 5 is accommodated, and the tip of the arm 31 is brought into contact with the projection 32 provided on the bottom surface of the depression 8. Further, a spring device 11 for pushing up and urging the claw member 9 is provided in the depression 8, and a bag-shaped expansion / contraction body 33 made of, for example, rubber is provided above the arm 31 in the depression 8. Engaging part 9 of member 9
a ring-shaped cover plate 3 having a hole 34 through which a can pass
5 is attached to the outer periphery of the cylindrical member 5, and the cover plate 35
Thus, the opening of the depression 8 is covered. Then, a small hole 36 communicating from the inner peripheral side of the cylindrical member 5 to the expansion / contraction body 33 is provided, and a gap between the cylindrical member 5 and the central shaft 1 is closed on the inner periphery of the cylindrical member 8 so as to sandwich the small hole 36. A pair of sealing rings 28 are provided.

In this friction winding shaft, the expansion / contraction body 3
When compressed air is supplied to 3, it expands and pushes down the arm 31, causing the claw member 9 to retreat as shown by a chain line in FIG. 4. When compressed air is extracted from the expansion / contraction body 33, the expansion / contraction body 3
3 is contracted, the claw member 9 is pushed up by the urging force of the spring device 11, the engaging portion 8 protrudes from the hole 34 of the cover plate 35, and fixes the core C fitted on the cylindrical member 5 on the cylindrical member 5. can do. When the center axis is rotated clockwise in FIG. 4, the core C rotates counterclockwise relatively appropriately, and the claw member 9 is pushed in the direction of the pin 32. The pin 32 receives the pushing force. The movement of the tip of the arm 31 is prevented.

In FIG. 4, the circumferential movement of the claw member 9 of the cylindrical member 5 is prevented by the projection 32. In the present invention, in order to prevent the movement of the claw member described above, an axis is provided on the bottom surface of the recessed portion. And a hole is provided in the claw member, and an arm extending in the circumferential direction of the cylindrical member is provided below the claw member, and a compression coil spring is concentrically mounted on the outer periphery of the shaft, and from thereabove. A pawl member may be slidably fitted on the shaft. Further, in the embodiment shown in FIG. 3, the claw members 9 are provided at three places at intervals in the circumferential direction of the cylindrical member 5, but they are arranged at four or more places in the circumferential direction of the cylindrical member at intervals. You may.

[0035]

According to the first aspect of the present invention, the push-back device for retracting the engaging portion of the claw member into the recessed portion by the compressed air is separated from the spring device in the circumferential direction of the cylindrical member. With this arrangement, the spring device and the push-back device can be simplified and miniaturized, and the structure of the cylindrical member can be easily narrowed. Wall thickness can be reduced. Therefore, the outer diameter of the center shaft can be made relatively larger than the outer diameter of the winding shaft, and the mechanical strength of the center shaft does not decrease, and a relatively long winding shaft can be easily obtained. And even when the rotation is stopped, the core on the cylindrical member can be fixed securely, the structure is simple,
It is possible to provide a friction winding shaft that is easy to assemble and is convenient to apply to an existing slitter rewinder.

According to the second aspect of the present invention, since the claw member is pivotally supported by the pin, it is possible to obtain a claw member that operates reliably without a small frictional resistance when the claw member is tilted. In addition, since the claw member is directly pushed up by the piston to retreat the engaging portion of the claw member, the hole for inserting the piston can be formed from the outer peripheral side of the cylindrical member, so that the processing is easy, and the compressed air to the piston is compressed. The passage is easily formed. And a push-back device with high airtightness can be obtained, the use of compressed air with high pressure becomes possible, and the size of the piston can be reduced. Also, the spring device can be easily assembled from the outer peripheral side of the cylindrical member. And even if it is a friction winding shaft in which a large number of cylindrical members are fitted to the center shaft, it is possible to obtain a winding core having a high reliability in releasing operation of fixing the core.

According to the third aspect of the present invention, by providing the expansion and contraction body which can be expanded and contracted by compressed air above the arm portion of the claw member, the structure of the push-back device is simplified and the airtightness is further improved. be able to.

According to the fourth aspect of the present invention, compressed air is supplied to the space between the inner periphery of the central shaft and the outer periphery of the tube,
The supplied compressed air passes through the gap between the hole and the push-up rod, passes through the small hole, reaches the push-back device provided on the cylindrical member, and the push-back device is operated to release the fixing of the core. That is, since the outside of the tube in the hollow portion of the center shaft and the hole in which the push-up rod is inserted can be used as a passage for compressed air, without making the processing of the center shaft difficult or reducing the mechanical strength of the center shaft. , Can supply compressed air to the push-back device.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a friction winding shaft according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a front view showing a cross section of a main part of the friction winding shaft shown in FIG. 1;

FIG. 4 is a side view showing a part of a cross section of a friction winding shaft according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Center shaft 5 Cylindrical member 6 Bearing 8 Depressed part 9 Claw member 9a Engaging part 10 Pin 11 Spring device 12 Push-back device 13 Hole 14 Compression coil spring 16 Piston 17 Hole 18 Friction engagement mechanism 19 Hole 20 Push-up rod 21 Tube 27 Small Hole 28 Sealing ring 31 Arm 32 Pin 33 Expansion / contraction body 35 Cover plate 36 Small hole

Claims (4)

[Claims] 1. A friction winding shaft comprising: a plurality of cylindrical members rotatably mounted on a center shaft via a bearing; and a friction engagement mechanism for frictionally engaging the center shaft and the cylindrical member. A claw member having a depressed portion formed on the outer periphery, an engaging portion engageable with the inner perimeter of the core fitted on the outer periphery of the cylindrical member, and a claw member irremovably housed in the depressed portion; A spring device provided in the depression, which urges the portion to protrude from the depression, and compressed air provided in the depression at a distance from the spring device in a circumferential direction of the cylindrical member. A push-back device that receives and pushes back the claw member, a small hole provided in the cylindrical member for guiding compressed air from the inner peripheral side of the cylindrical member to the push-back device, and a cylindrical member provided to sandwich the small hole. A pair of sealing rings for closing a gap between the inner peripheral surface and the outer peripheral surface of the central shaft; A passage provided in the central shaft for guiding the compressed air supplied to the end of the central shaft to a space surrounded by the pair of sealing rings, the inner peripheral surface of the cylindrical member, and the outer peripheral surface of the central shaft. A friction winding shaft comprising: 2. The claw member extends in a circumferential direction of the cylindrical member, and is pivotally supported by a pin attached to the cylindrical member.
2. The friction reel according to claim 1, wherein the push-back device comprises a piston for pushing up the other end of the claw member, and a hole having a required depth formed in the recessed portion for accommodating the piston. 3. The friction winding shaft according to claim 1, wherein the claw member has an arm extending in a circumferential direction of the cylindrical member, and the push-back device is provided above the arm of the claw member. A cover plate having a hole through which the engaging portion of the claw member can extend is attached to the outer periphery of the cylindrical member so as to cover the opening of the recessed portion so as to cover the opening of the recessed portion. Features a friction reel. 4. The center shaft is hollow, and the friction engagement mechanism has a radial hole in the center shaft communicating with the hollow portion.
It is provided corresponding to each cylindrical member, and a push rod is loosely inserted into the hole, and a tube which can be expanded and contracted by compressed air is inserted into a hollow portion of the center shaft, and the pair of sealing rings are formed. 2. A space between an inner periphery of the central shaft and an outer periphery of the tube and the hole are used as a passage for supplying compressed air therebetween.
The described friction winding shaft.