JPH11301893A - Frictional bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frictional bobbin, on which a core fixing means provided for winding collars is operated with the relative rotation of the winding collars to a core, capable of holding the core not to be laterally shifted during winding stop and ensuring easy machining, assembly and maintenance. SOLUTION: A lateral shift preventing ring 14 which is rotatably passed through a center driving shaft 1 and constrained in the longitudinal direction of the center driving shaft 1 is provided between winding collars. The lateral shift preventing ring 14 includes a depression portion 15 formed in its outer periphery, a pawl member 16 stored in the depression portion 15 so that an engagement portion 16a can be moved in and out, a spring device 17 for energizing the pawl member 16 so that the engagement portion 16a can be engaged with the inner periphery of a core C, a push-back device 18 operated with compressed air supplied from the inner periphery side for moving back the engagement portion 16a of the pawl member 16 and a pair of ring seals 25 mounted on the inner periphery side. A center driving shaft 1 includes holes 26 for respectively supplying compressed air between the pair of seals 25 and a common passage 30 longitudinally extending through the holes 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a central drive shaft and a number of winding collars fitted on the outer periphery of the central drive shaft, and the winding collar forms a tubular core for winding a belt-like sheet. The present invention relates to a friction winding shaft that can be held and that can be frictionally driven by a central driving shaft with a winding collar.

[0002]

2. Description of the Related Art Generally, in a friction winding shaft, when the winding tension of a belt-shaped sheet is increased and the winding torque is going to be larger than the rotational force transmitted to the winding collar, the winding collar is connected to a center driving shaft. On the other hand, it is possible to prevent the winding tension from being excessively increased by slipping individually, so that even if there is a difference in the winding diameter between the winding rolls during winding, the tension of the belt-shaped sheet becomes excessive, Can be prevented from sagging. For this reason, the friction winding shaft is used in a sheet dividing and winding device that winds the divided narrow sheets at the same time while dividing a wide band-shaped sheet such as a plastic film, paper, or a thin metal sheet into a plurality of narrow sheets. .

Conventionally, the above-mentioned friction winding shaft has a plurality of winding collars on a central drive shaft, a plurality of inclined grooves having a bottom inclined at circumferential intervals on an outer periphery thereof, and a plurality of inclined grooves in each inclined groove. And a sphere housed in a rollable and non-dropping manner. In this friction winding shaft, when the winding core and the winding collar rotate relatively,
The sphere rolls on the bottom surface of the inclined groove to a shallow portion, and at the same time, a part of the sphere projects from the inclined groove and engages with the inner periphery of the winding core, thereby fixing the winding core to the winding collar. That is, the core fixing mechanism operates by the relative rotation between the core and the take-up collar (for example, see Japanese Patent No. 2678482).

[0004] Further, as a friction winding shaft which can fix the winding core to the winding collar without relative rotation between the winding core and the winding collar, a movable member is provided in one of the axial longitudinal directions by a spring. Pressing, the inclined groove formed on the outer periphery of the movable member pushes up the claw member connected in a ring shape with an elastic ring, expands in the diameter direction, grips the core with the enlarged claw member, and releases the core. In this case, the winding collar includes a chuck mechanism of a type in which the claw member is reduced by pushing back the movable member against the pressing force of the spring with the supplied compressed air (for example, see Japanese Patent No. 2515159). .

[0005]

However, in the friction winding shaft having the sphere for fixing the winding core as described above, when the relative rotational force between the winding core and the winding collar is lost,
Since the force for moving the sphere to the shallow portion of the inclined groove is lost, the holding of the core becomes unstable. Therefore, for example, when a sheet roll is completed by adding another band-shaped sheet to the end of the wound band-shaped sheet, the winding operation must be temporarily stopped to join the band-shaped sheets. The core may be laterally displaced due to, for example, the fact that a sphere that is only partially involved in the corner between the end face and the inner peripheral surface of the core applies a longitudinal force to the corner of the core. Then, if rewinding is resumed in a state where the core is shifted laterally, the end faces of the sheet roll become uneven.

Further, in the above-described friction winding shaft in which the claw member is expanded and contracted by the force of the spring and compressed air to grip and release the core, the claw member is reciprocated by the force of the spring and compressed air to expand and contract. The movable member for, as well as the winding collar that holds the movable member on the outer peripheral side, has a complicated shape,
It is very difficult to seal it. Moreover, since the claw member needs to be held so that the winding core does not run idle due to the winding torque, the gripping force must be large, and it is necessary to increase the force of the spring pressing the movable member. The compressed air that pushes back the movable member against the force of the above and the frictional force of the sliding surface also needs to have relatively large pressure. Therefore, air leakage easily occurs in the friction winding shaft that expands and contracts the claw member with the above-described spring and compressed air.
In addition, the processing is difficult, and the assembling is troublesome and expensive. Further, maintenance such as replacement of the seal becomes very troublesome.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is directed to a friction winding shaft in which a winding core fixing means provided on a winding collar is operated by relative rotation between the winding collar and the winding core. In particular, it is an object of the present invention to provide a winding core that can be held so as not to be laterally displaced and that is relatively easy to process, assemble, and maintain.

[0008]

According to the present invention, there is provided a center drive shaft, and a plurality of winding collars rotatably mounted on the outer periphery of the center drive shaft. The winding collar can be driven, and the winding collar operates by the relative rotation between the cylindrical winding core for winding the sheet fitted on the outer periphery thereof and the winding collar, so that the winding core is concentric with the winding collar. A friction winding shaft having a winding core fixing mechanism for fixing in a shape, a lateral displacement between the winding collars rotatably penetrating by the center drive shaft and restrained in a longitudinal direction of the center drive shaft. Prevention ring, the lateral displacement prevention ring has a depression formed on the outer peripheral side thereof, and an engagement portion that engages with the inner periphery of the winding core, and the engagement portion can be advanced and retracted. The claw member housed in the depression and the engaging portion advance A spring device for urging the pawl member into so that, for retracting the engagement portion of the pawl member,
A push-back device that works with compressed air supplied from the inner peripheral side of the lateral deviation prevention ring, and a pair of ring-shaped seals attached to the inner peripheral side of the lateral deviation prevention ring; A hole for supplying compressed air between the pair of seals and a common longitudinally extending passage leading to the hole are provided.

During winding of the web, the winding collar holds the core so that it rotates concentrically and therewith. The push-back device for the lateral displacement prevention ring works to retract the engaging portion of the claw member when the core and the sheet roll are attached to and detached from the friction winding shaft. The engaging portion of the claw member of the lateral displacement prevention ring is urged by the spring device when the push-back device is not working, and is pressed against the inner periphery of the winding core fitted on the outer periphery of the winding collar. The lateral displacement prevention ring is rotatably penetrated by the center drive shaft, and is restricted in the longitudinal direction of the center drive shaft. Therefore, the anti-lateral displacement ring holds the core so as not to be laterally displaced except when the core is removed or attached, and is not substantially frictionally driven by the central drive shaft. Follow. Therefore, even if the winding core is not fixed to the winding collar when the winding is stopped, the lateral displacement of the core can be prevented by the lateral deviation preventing ring. And even if the claw member of the lateral deviation prevention ring is slightly related to the end of the core, the lateral deviation prevention ring rotates together with the core, so that the claw member scrapes off the end of the core during winding the sheet. Can be prevented.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is an overall view of a friction reel according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 shows a main part of the friction reel shown in FIG. FIG. 4 is a longitudinal sectional view, and FIG. 4 is a sectional view taken along the line BB in FIG.

In FIG. 1, the friction winding shaft includes a center drive shaft 1 and a number of ring-shaped winding collars 2 rotatably mounted on the outer periphery of the center drive shaft 1. The winding collar 2 includes a core fixing mechanism 3, and the core fixing mechanism 3 winds a cylindrical core C that is fitted on the outer periphery of the winding collar 2 and winds the belt-shaped sheet S in a roll shape. It can be fixed to the collar 2. The center drive shaft 1 is supported at both ends by a bearing 4 and a rotation center device 5 when the belt-shaped sheet is wound, and is driven to rotate by a rotation drive mechanism (not shown).

As shown in FIG. 2 and FIG.
A holding hole 6 provided to correspond to the hollow portion 1a, each winding collar 2 and extending from the outer peripheral side to the hollow portion 1a; an expandable and contractible tube 7 inserted into the hollow portion 1a; And a friction member 8 inserted into the Each winding collar 2 is supported via a pair of bearings 9, respectively.
The tube 7 is expanded by supplying compressed air to the inside of the tube 7, and the friction member 8 is pushed up by the tube 7 to press the upper end of the friction member 8 against the inner periphery of the winding collar 2. A rotational force corresponding to a frictional force with the inner periphery of the collar 2 can be transmitted from the central drive shaft 1 to the winding collar 2. Therefore, the center drive shaft 1 can frictionally drive the winding collar 2.

The winding core fixing mechanism 3 is provided at six circumferential positions on the outer peripheral side of the winding collar 2 at equal intervals, and has inclined grooves 10 whose bottom surfaces are inclined tangentially to the outer peripheral surface. Groove 10
The spheres 11 respectively accommodated in each of the spheres 11 and the spheres 11 are prevented from falling out of the inclined grooves 10, and further, while maintaining a mutual interval,
A known ring (see Japanese Patent No. 2678) comprising a holding ring 12 which is held along the bottom surface of the inclined groove 10 so as to be able to roll from the deep part 10a to the shallow part 10b or vice versa.
482). When the winding core C fitted on the winding collar 2 rotates with respect to the winding collar 2 in the direction of the arrow in FIG.
It moves to the shallow part 10b of the inclined groove 10 while maintaining the distance from each other, and protrudes from the outer periphery of the holding ring 12 by the same amount. Therefore, the winding core fixing mechanism 3 operates by the relative rotation between the winding core C fitted on the outer periphery of the winding collar 2 and the winding collar 2 so that the winding core C is concentric with the winding collar 2 and the winding collar 2 Can be held to rotate with. In the core fixing mechanism 3, since the sphere 11 is engaged with the inner periphery of the core C, the inner peripheral surface of the core C and the corner between the end surface and the inner peripheral surface of the core C are not cut during winding. In addition, scattering of paper dust can be prevented. If necessary, the sphere 11 may be replaced with a roller having rounded ends.

The center drive shaft 1 is provided with a spacer ring 13 for keeping the distance between the winding collars 2 and preventing the lateral displacement of the winding collars 2 from accumulating. The winding collars 2 on both sides are in contact with the inner ring side surface of the bearing 9.

According to the present invention, between the adjacent winding collars 2, the lateral displacement preventing ring 1 loosely penetrated by the center drive shaft 1 is provided.
4 is provided. The width of the lateral displacement prevention ring 14 is slightly smaller than the width of the spacer ring 13 and is adjacent to the outer ring side surface of the bearing 9 of the winding collar 2 on both sides. Therefore, the lateral displacement prevention ring 14 is restrained in the longitudinal direction of the center drive shaft 1 and is rotatable with respect to the center drive shaft 1.

As shown in FIG.
Are depressed portions 1 formed at four locations on the outer circumferential side in the circumferential direction.
5 and an engaging portion 16a that engages with the inner periphery of the core C. The claw member 16 accommodated in the depression 15 so that the engaging portion can advance and retreat, and the engaging portion 16a Spring device 17 for urging claw member 16 to engage with the inner periphery of core C
And a push-back device 18 for retracting the engaging portion 16a against the urging force of the spring device 17.

The claw member 16 extends in the circumferential direction of the lateral displacement prevention ring 14 and a pin 19 is attached to the lateral displacement prevention ring 14.
And has an engaging portion 16a at one end. FIG.
Although the engaging portion 16a shown in (1) has a projection for securely holding the core C, the engaging portion 16a may have a flat surface if necessary.
The spring device 17 includes a compression coil spring 21 housed in a hole 20 formed in the depression 15 of the lateral displacement prevention ring 14, and a metal fitting 22 mounted on the compression coil spring 21 and engaged with the claw member 16. The engaging portion 16a side of the member 16 is pushed up. The push-back device 18 is provided with the lateral displacement prevention ring 1.
4 is arranged in the circumferential direction of the lateral displacement prevention ring 14 with respect to the spring device 17 in order to reduce the width of the spring device 4, and the piston fitted in the hole 23 formed in the recessed portion 15 of the lateral displacement prevention ring 14. 24. And the horizontal displacement prevention ring 14
Works on the compressed air supplied from the inner peripheral side of the claw member 16 to push up the other end of the claw member 16.

As shown in FIG. 3, the lateral displacement prevention ring 14 further includes a pair of ring-shaped seals 25 mounted on the inner peripheral side thereof. In addition, the center drive shaft 1 is provided with holes 26 communicating with the hollow portions 1a for supplying compressed air between the pair of seals 25, 25, respectively, so as to correspond to the respective lateral displacement prevention rings 14. At one end of the center drive shaft 1, as shown in FIG. 1, an introduction hole 27 for guiding compressed air to the tube 7, and compressed air is supplied to a gap between the outer periphery of the tube 7 and the inner periphery of the center drive shaft 1. Guide holes 28 are provided, and compressed air can be supplied to these introduce holes 27, 28 when necessary through a rotary joint 29 attached to one end of the central drive shaft 1. The compressed air introduced into the introduction hole 28 is supplied to each hole 26 through a gap 30 between the outer periphery of the tube 7 and the inner periphery of the central drive shaft 1. To prevent the compressed air supplied to the gap 30 from leaking, a ring-shaped seal 31 is attached to the friction member 8. A seal 32 is provided between the inner circumference of the spacer ring 13 and the outer circumference of the center drive shaft 1 so as to sandwich the hole 26. Further, the other end of the center drive shaft 1 is closed. Therefore, the gap 30 between the outer circumference of the tube 7 and the inner circumference of the center drive shaft 1 is a common passage for compressed air for supplying compressed air to each hole 26.

As shown in FIG. 1, a series of take-up collars 2 and a lateral displacement prevention ring 14 on the central drive shaft 1 are driven centrally by an end face of the large-diameter portion 1b of the central drive shaft 1 and a set screw (not shown). It is constrained in the longitudinal direction of the central drive shaft 1 by being sandwiched between the end surface of a cylindrical body 33 fixed to the outer periphery of the shaft 1.

In order to wind up the belt-like sheet with the friction winding shaft shown in FIG. 1, the friction winding shaft is moved from the winding position to the left in FIG. Is opened, and compressed air is supplied to the introduction hole 28 via the rotary joint 29. Then, the compressed air passes through the gap 30 and the hole 26 between the outer periphery of the tube 7 and the inner periphery of the central drive shaft 1 and reaches between the pair of seals 25 on the inner peripheral side of each lateral displacement prevention ring 14, as shown in FIG. Like piston 2
4, the claw member 16 is pushed up on the side opposite to the engaging portion 16a, and the engaging portion 16 retreats into the recessed portion 15. Thereafter, the necessary core C is fitted from the end of the center drive shaft 1 to a required position on the friction winding shaft, and the supply of compressed air to the introduction hole 28 is stopped. Then, as shown in FIG. 3, the claw member 16 is pushed up on the engaging portion 16 a side by the spring device 17, and the engaging portion 16 a is engaged with the inner periphery of the core C, and the core C is held against the lateral displacement prevention ring 14. Hold it so that it does not shift upward. At the same time, the piston 25 is pushed down on the opposite side of the engaging portion 16a of the claw member 16 swinging about the pin 19.

Thereafter, the friction winding shaft is returned to the winding position as shown in FIG.
, The central drive shaft 1 is driven to rotate, and compressed air of a required pressure is supplied to the tube 7 from the introduction hole 27 to frictionally engage the friction member 8 with the inner periphery of the winding collar 2.
Then, the take-up collar 2 is frictionally driven by the center drive shaft 1 to rotate the take-up collar 2 with respect to the core C on which the belt-shaped sheet is stopped, thereby, as shown in FIG. 3 of the sphere 11 extends from the deep part 10a to the shallow part 10 of the inclined groove 10.
b and protrudes from the outer periphery of the winding collar 2, the core C is held on the winding collar 2, the core C and the winding collar 2 rotate concentrically and together, and the belt-shaped sheet is driven by sheet friction. It is wound around the winding core C with a tension according to the force. During winding of the belt-shaped sheet, the lateral displacement prevention ring 14 rotates together with the core C because the claw member 16 holds the core C. Since the core C is restrained in the longitudinal direction of the center drive shaft 1, even if the winding is stopped and the holding of the core C by the core fixing mechanism 3 becomes unstable, the core C is held so as not to be shifted laterally. can do.

In order to remove the sheet roll R from the friction winding shaft, the friction winding shaft is moved to the left in FIG. 1 again to open the space between the rotary center device 5 and the end of the center drive shaft 1 and to release compressed air. Each of the horizontal deviation preventing rings 1 is inserted through an opening 26 at the end of the center drive shaft 1 through a gap 30 and a hole 26 between the outer periphery of the tube 7 and the inner periphery of the center drive shaft 1.
4 between the pair of seals 19 on the inner peripheral side.

The embodiments of the present invention can be variously changed as required. For example, the piston serving as the push-back device may be replaced with a bag-shaped expansion / contraction body made of an elastic material such as rubber and expandable with compressed air. The winding collar is disclosed in JP-A-61-12558 and JP-A-61-21.
Elastic expansion, as disclosed in
It may be provided with a core fixing mechanism for engaging a contractible ring with the inner periphery of the core. Further, the center drive shaft is provided with a piston for pressing the upper end against the inner periphery of the winding collar, as shown in FIG. 4 of Japanese Patent Publication No. 33339/1988, instead of a friction member pushed up by an inflatable and contractible tube. May be. Also, the common longitudinally extending passage leading to the hole for supplying compressed air between the pair of seals may be a small hole formed from the end of the hollow shaft.

[0025]

According to the first aspect of the present invention, the winding collar for preventing the winding core from running idle due to the winding torque and the lateral displacement preventing ring for preventing the lateral displacement of the winding core are separately provided. The winding collar constrains the core in the circumferential and longitudinal directions during winding, and the lateral displacement prevention ring constrains the core in the longitudinal direction by a claw member biased by a spring unless the push-back device is operated. I do. Therefore, even if the take-up collar is held in an unstable state when the take-up collar is temporarily stopped by the take-up collar, the take-up core is held by the side-shift prevention ring so that it does not shift, and winding is resumed. This can prevent the end faces from becoming irregular. Further, since the lateral displacement force for moving the core in the longitudinal direction while the winding is stopped is generally hardly generated and even if generated, the restraining force in the longitudinal direction of the core by the lateral displacement prevention ring is relatively small. You may. Therefore, the spring for urging the claw member needs only a relatively weak force,
The compressed air for pushing back the claw member against the force of the spring may not be high pressure. Also, since the anti-lateral displacement ring does not require a bearing, it can be easily mounted on the center drive shaft. Further, as the push-back device, a piston or the like which has a simple structure and operates with compressed air and has very little air leakage can be used, and the push-back device can be downsized. Therefore, it is possible to provide a friction winding shaft that has extremely little air leakage and is relatively easy to process and assemble. Since the individual structures of the take-up collar and the lateral displacement prevention ring are simplified, each can be reduced in size, from the mounting pitch of the take-up collar and the lateral displacement prevention ring, to the outer periphery of the center drive shaft to the lateral displacement prevention ring. , That is, the thickness of the lateral displacement prevention ring can be made relatively small.

According to the second aspect of the present invention, it is possible to obtain a narrow lateral displacement prevention ring. Further, the claw member can be securely held. Further, since the passage of the compressed air for operating the piston can be simply formed, the machining is facilitated, and the friction reel having very small air leakage and reliable operation can be provided.

According to the third aspect of the invention, the processing of the passage for supplying the compressed air to the lateral displacement prevention ring is simplified.

According to the fourth aspect of the present invention, when a core having low mechanical strength such as a paper tube is used, the sphere or the roller is wound even if it is slightly engaged with the core end. Since the inner periphery of the core end is not scraped off, the inner periphery of the core tube is shaved by the claw member during winding, which occurs when a conventional winding shaft that engages the claw member and restrains the core is used. The disadvantage that a large amount of powder is scattered and the quality of the winding roll is reduced can be solved.

[Brief description of the drawings]

FIG. 1 is an overall view of a friction winding shaft according to an embodiment of the present invention.

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

FIG. 3 is a sectional view taken along the line BB in FIG.

FIG. 4 is a longitudinal sectional view showing a main part of the friction winding shaft shown in FIG.

FIG. 5 is a longitudinal sectional view showing a state in which a device for pushing up a lateral displacement prevention ring is operated.

[Explanation of symbols]

 C winding core 1 center drive shaft 2 winding collar 3 winding core fixing mechanism 7 tube 8 friction member 10 inclined groove 11 sphere 12 holding ring 14 lateral displacement prevention ring 15 depressed portion 16 claw member 17 spring device 18 push-back device 19 pin 25 seal 26 holes 30 common passage (gap) for compressed air

Claims (4)

[Claims] 1. A center drive shaft, and a number of winding collars rotatably mounted on an outer periphery of the center drive shaft, wherein the center drive shaft can frictionally drive the winding collar. The take-up collar operates by the relative rotation between the tubular take-up core for sheet take-up fitted on the outer periphery thereof and the take-up collar, and the core is fixed concentrically to the take-up collar. A friction-winding shaft, wherein the lateral-shift-preventing ring is rotatably penetrated between the winding collars by the central drive shaft, and is restricted in a longitudinal direction of the central drive shaft. The prevention ring has a depressed portion formed on the outer peripheral side thereof, an engaging portion engaging with the inner periphery of the winding core, and a claw member housed in the depressed portion so that the engaging portion can advance and retreat. Urging the claw member so that the engaging portion advances. Spring device, a push-back device that works with compressed air supplied from the inner peripheral side of the lateral deviation prevention ring for retreating the engagement portion of the claw member, and an inner peripheral side of the lateral deviation prevention ring. A pair of ring-shaped seals, wherein the central drive shaft has a hole for supplying compressed air between the pair of seals, and a common longitudinally extending passage leading to the hole. A friction winding shaft characterized in that: 2. The claw member extends in a circumferential direction of the lateral displacement prevention ring, is pivotally supported by the lateral displacement prevention ring with a pin, and has the engaging portion on one end side, 2. The friction reel according to claim 1, wherein a spring device pushes up one end of the claw member, and the push-back device comprises a piston that pushes up another end of the claw member. 3. The center drive shaft includes a hollow portion, a guide hole provided corresponding to the winding collar, the guide hole communicating with the hollow portion from an outer peripheral side, and an inflatable and contractible tube inserted into the hollow portion. The friction winding shaft according to claim 1, further comprising a friction member inserted into the guide hole, wherein a gap between an outer periphery of the tube and an inner periphery of the center drive shaft is a common passage for the compressed air. 4. The winding core fixing mechanism of the winding collar is provided with spheres or rollers having roundness at both ends in inclined grooves provided at least at three positions, and the spheres or rollers are engaged with the inner periphery of the winding core. The friction winding shaft according to claim 1.