JP6286095B1 - Sheet take-up shaft - Google Patents

Abstract

The present invention provides a sheet take-up shaft in which the winding core can be easily fixed and released, and the adjustment of the take-up tension can be made more strict and the variation in the take-up tension can be reduced. SOLUTION: A winding part 3 fitted in a state rotatable relative to a base shaft 2, a cylinder ring 13 fitted in a fixed state to the base shaft 2, and a slide by a compressed fluid from a first fluid path 11. A winding core attaching / detaching piston 17 and a rotational torque adjusting piston 24 slid by the compressed fluid from the second fluid path 25, and the winding unit 3 fixes and releases the fixing of the core 10 to the winding unit 3. The chucking mechanism 9 for performing the above operation and the friction portion 19 are provided. The sliding direction of the rotational torque adjusting piston 24 is the axial direction of the base shaft 2, and the rotational torque adjusting piston 24 presses the friction portion 19 to rotate the rotational torque. The rotation of the base shaft 2 is transmitted to the winding unit 3 by the friction between the adjustment piston 24 and the friction unit 19. [Selection] Figure 7

Description

  The present invention relates to a sheet winding shaft for winding a sheet around a winding core.

  A sheet take-up shaft is used to take up a sheet such as paper or film slit into a narrow width. For example, a take-up shaft called an air friction take-up shaft is known. The air friction take-up shaft has a structure in which a plurality of take-up portions are externally fitted to a base shaft so as to be relatively rotatable, and the rotation of the base shaft is transmitted to the take-up portion via a rotational torque adjusting member. A winding core (for example, a paper tube) is fixed to the winding unit, and a slit sheet is wound on the winding unit.

  Without a structure that transmits this rotational torque to the take-up unit, if a plurality of cores are fixed on the base shaft, and the sheet is wound with the same rotation, the outer diameter is slightly larger due to uneven thickness of the sheet. The tension is concentrated on the wound product, and the winding tension of each product is greatly different, which causes a winding failure of the wound product.

  On the other hand, the air friction take-up shaft can transmit the same rotational torque to a take-up product having a slightly different outer diameter caused by uneven thickness of the sheet and the like. It is possible to avoid concentration of tension on the product. In addition, by controlling the air pressure flowing into the rotational torque adjusting member, it is possible to apply a rotational torque according to the winding diameter of the wound product to the winding core, and as a result, the optimum winding tension according to the outer diameter is applied to the sheet. Can be given to.

The air friction take-up shaft is required to cope with high function and mass production of the film, and there is a demand for an air friction take-up shaft that can adjust the take-up tension more precisely while providing convenience.

  As an example of the air friction winding shaft, there is a sheet winding shaft device disclosed in Patent Document 1. The sheet take-up shaft device has a take-up portion fitted around a take-up rotary shaft member, and a pressure receiving member provided inside the take-up rotary shaft member. By urging the pressure receiving member with air pressure, the pressure receiving member presses the winding portion, and the rotation of the winding rotary shaft member is transmitted to the winding portion. Further, the sheet take-up shaft device uses air pressure for switching between fixing and releasing of the core, so that the core can be easily replaced. The air pressure used for fixing and releasing the winding core is generated through an air path different from the air path that presses the pressure receiving member, so that each air pressure can be individually adjusted according to its role.

JP 2005-15170 A

  In the sheet winding shaft device of Patent Document 1, when considering the adjustment of the winding tension more strictly and reducing the variation in the winding tension, a pressure receiving member is provided inside the winding rotary shaft member. In the structure, it has been found that there are problems due to the structure.

  In the sheet winding shaft device of Patent Document 1, the winding tension is adjusted by adjusting the friction between the pressure receiving member and the winding portion. Therefore, it can be said that if the unevenness of the friction is further reduced, the adjustment of the winding tension becomes more precise and the variation of the winding tension is reduced. However, in this sheet winding device, since the surface pressed by the pressure receiving member presses the inner surface of the winding portion that forms a cylinder, friction is generated, so that the tip shape of the pressure receiving member and the shape of the inner surface of the winding portion In addition, the contact state is not stable due to rotation and wear of the pressure receiving member, friction is uneven, and it is difficult to stabilize the winding tension.

  The present invention solves the conventional problems as described above, and in addition to facilitating fixing and releasing of the winding core, the winding tension is adjusted more strictly and the winding tension varies. It is an object of the present invention to provide a sheet take-up shaft that can reduce the number of rolls.

  In order to achieve the above object, a sheet winding shaft according to the present invention is a sheet winding shaft for winding a sheet around a winding core, and includes a first fluid path and a second fluid path through which a compressed fluid flows. A base shaft, a winding portion externally fitted to the base shaft in a state of being rotatable relative to the base shaft, a cylinder ring externally fitted to the base shaft in a state fixed to the base shaft, and built in the cylinder ring, A winding core attaching / detaching piston that slides by a compressed fluid flowing in from a first fluid path; and a rotational torque adjusting piston that is built in the cylinder ring and slides by a compressed fluid flowing in from the second fluid path. Comprises a chuck mechanism for fixing the core to the winding part and releasing the fixing by sliding the core attaching / detaching piston, and a friction part facing the rotational torque adjusting piston. The sliding direction of the rotational torque adjusting piston is the axial direction of the base shaft, and the rotational torque adjusting piston presses the friction portion, and the base shaft rotates due to the friction between the rotational torque adjusting piston and the friction portion. Is transmitted to the winding unit.

  According to this configuration, since the rotational torque adjusting piston presses the friction portion in the axial direction of the base shaft, the friction portion can be formed as a flat surface, and therefore there is a variation in the contact state between the friction portion and the tip of the rotational torque adjusting piston. Easy to suppress. For this reason, the adjustment of the winding tension when winding the sheet onto the winding core can be made more strict, and the variation in winding tension can be reduced. In addition, when a plurality of winding cores are mounted on the same winding shaft and wound, the difference in winding tension between the winding cores is reduced, so that the sheet can be wound evenly. In addition, since the rotational torque adjusting piston and the core attaching / detaching piston use separate fluid paths, the strength of the pressing force of the rotating torque adjusting piston does not affect the gripping force of the core.

  The sheet winding shaft of the present invention preferably has the following configurations. The cylinder ring is an annular body surrounding the base shaft, and it is preferable that the rotational torque adjusting piston and the core attaching / detaching piston are mixedly arranged in a circumferential direction of the cylinder ring. According to this configuration, the rotational torque adjusting piston and the core attaching / detaching piston do not extend in the axial direction of the base shaft, so that the width of the winding portion can be further reduced. Increasing the width of the winding unit is advantageous for the strength of the winding shaft, but it cannot cope with the winding of a narrow width sheet, and the number of winding units allocated to one winding core is reduced. When a plurality of winding cores are mounted on the same winding shaft, the difference in the number of winding portions assigned to the individual winding cores increases, resulting in a difference in winding tension for each winding core. become. In other words, in order to perform more precise winding on the sheet winding shaft, it is advantageous that the width of the winding portion is small, and it is important to keep this width small.

  It is preferable that the cylinder ring is covered with the winding unit and is built in the winding unit. According to this configuration, even if the inner surface of the winding core is in contact with the outer peripheral surface of the winding unit due to deformation of the winding core, the winding core does not contact the cylinder ring. It is possible to prevent foreign matters from entering the winding unit mechanism. In addition, since the core can be mounted on the take-up portion without the inner surface of the core contacting the cylinder ring, it is possible to prevent the core from being mounted in a significantly inclined state. Furthermore, if the cylinder ring is covered with the winding part, the winding core does not contact the cylinder ring, and the winding part only receives a set rotational torque, which is advantageous for safety. If a part of the cylinder ring is exposed, the exposed part is rotated by the driving torque of the base shaft, and if this is touched, a entanglement accident may occur, which is not preferable for safety.

  It is preferable that the base shaft and the winding portion can be relatively rotated by a bearing, and the bearing is disposed at a position sandwiching the cylinder ring in the axial direction of the base shaft. According to this configuration, the winding portion rotates around the base shaft with higher accuracy, so that variations in winding tension can be reduced.

  It is preferable that the chuck mechanism is provided with a slide ring, and the winding core attaching / detaching piston presses the slide ring to release the fixing of the core. According to this configuration, the winding core attaching / detaching piston does not need to press the chuck mechanism while the sheet is being wound, and extra friction is hardly applied when the sheet is wound. The winding portion can be rotated in accordance with the friction. Further, in this configuration, even when the supply of the compressed fluid stops for some reason during the winding, the sheet does not shift from the winding unit.

  The effects of the present invention are as described above. According to the present invention, the rotational torque adjusting piston presses the friction portion in the axial direction of the base shaft, so that the contact state between the tip of the rotational torque adjusting piston and the friction portion is easily stabilized. Because the friction is stable, the winding tension can be adjusted precisely, and even when multiple winding cores are mounted on the same winding shaft, there is little difference in winding tension between the winding cores. You can wind up the sheet. Moreover, the width of the winding unit can be further reduced.

The schematic diagram which shows schematic structure about an example of the slitter provided with the sheet | seat winding shaft which concerns on one Embodiment of this invention. 1 is an external perspective view of a sheet winding shaft according to an embodiment of the present invention. The front view of the sheet | seat winding shaft shown in FIG. It is sectional drawing in the AA line of FIG. 3, and sectional drawing which shows the fixed state of a core. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3, showing a state in which the winding core is released. FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, showing a state where rotation of the base shaft is transmitted to the winding unit. Sectional drawing in the BA line | wire of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating a schematic configuration of an example of a slitter including a sheet winding shaft according to an embodiment of the present invention. A roll 42 around which a wide sheet 41 is wound is attached to the slitter 40. The wide sheet 41 passes through a roller 44 and the like while being fed, is slit into a predetermined narrow sheet 43, and is wound around a core (not shown in detail) such as a paper tube attached to the sheet winding shaft 1. .

  FIG. 2 is an external perspective view of the sheet take-up shaft 1 according to the embodiment of the present invention. 3 is a front view of the sheet take-up shaft 1 shown in FIG. 2, and is a view taken in the direction of arrow A in FIG. An annular winding portion 3 is fitted on the cylindrical base shaft 2 via a bearing 20 so that the base shaft 2 and the winding portion 3 can be rotated relative to each other. For convenience of illustration, a single base shaft 2 is shown with one winding portion 3 fitted thereto, but a plurality of winding portions 3 may be attached to one base shaft 2 in series. . A claw 5 protrudes from the winding unit 3, and a winding core (see reference numeral 10 in FIG. 4) is fixed to the winding unit 3 by engagement with the claw 5. A slit sheet is wound around the core.

  Hereinafter, the sheet winding shaft 1 will be specifically described with reference to FIGS. 4 is a cross-sectional view showing the internal structure of the sheet take-up shaft 1, and is a cross-sectional view taken along the line AA in FIG. In this figure, a winding portion 3 is fitted on a base shaft 2 via a bearing 20. The winding unit 3 has an external appearance composed of an opposing member 31 facing the rotational torque adjusting piston 24 (see FIG. 6), an annular body 32, and a collar 4 fixed thereto, and includes a chuck mechanism 9 therein. .

  The chuck mechanism 9 includes a chuck chip 6 in which a claw 5 is integrated, a slide ring 7 and a spring 8 that is a biasing means. The chuck mechanism 9 is embedded in the opening 30 and is disposed at a predetermined interval in the circumferential direction of the winding unit 3 as shown in FIG.

  In FIG. 4, an annular cylinder ring 13 is fixed to the base shaft 2 via a seal ring 28 so as to surround the outer periphery of the base shaft 2. As will be described in detail later, the chuck mechanism 9 is actuated by the reciprocating motion of the core attaching / detaching piston 17 to switch between the state in which the pawl 5 is retracted into the opening 30 and the state in which the pawl 5 protrudes from the opening 30. The core 10 can be fixed and released.

  Hereinafter, fixing and releasing of the core 10 will be described with reference to FIGS. 4 and 5. The arrangement of the internal components of the sheet take-up shaft 1 shown in FIG. 4 shows a state when the core 10 is fixed. In the state of FIG. 4, the slide ring 7 has moved to the core attaching / detaching piston 17 side due to the extension of the spring 8. The inclined surfaces of the chuck chip 6 and the slide ring 7 are brought into contact with each other by magnetic force. When the slide ring 7 is moved to the core attaching / detaching piston 17 side, the chuck chip 6 is lifted, and the nail 5 integrated with the chuck chip 6 is provided. Protrudes from the outer peripheral surface of the collar 4. Therefore, the claw 5 is engaged with the inner peripheral surface of the winding core 10 attached to the winding unit 3, and the winding core 10 is fixed to the winding unit 3. In this state, the core 10 rotates integrally with the rotation of the winding unit 3, so that the sheet can be wound around the core 10.

  In FIG. 4, a first fluid path 11 through which a compressed fluid flows is formed in the base shaft 2, and a connection hole 12 branches in the middle of the first fluid path 11. The cylinder ring 13 is formed with a first cylinder chamber 16 that houses the core attaching / detaching piston 17. The first cylinder chamber 16 is partitioned into a bottom side space 14 and a rod side space 15 by a winding core attaching / detaching piston 17. In addition, a fluid supply / discharge path 18 is formed in the cylinder ring 13. One end of the fluid supply / discharge passage 18 is open to the base shaft 2 side, and the other end is connected to the bottom side space 14.

  In the state of FIG. 4, the first fluid path 11 and the fluid supply / discharge path 18 are connected via the connection hole 12. In this state, when a compressed fluid such as air is circulated through the first fluid path 11, the compressed fluid flows into the fluid supply / discharge path 18 through the connection hole 12 and then flows into the bottom side space 14. As a result, the core attaching / detaching piston 17 advances in the first cylinder chamber 16, and the tip of the core attaching / detaching piston 17 abuts against the slide ring 7.

  FIG. 5 is a cross-sectional view of the sheet take-up shaft 1 showing a state in which the winding core 10 is released. This figure shows a state in which a compressed fluid such as air is circulated from the state of FIG. As described above, when the compressed fluid is circulated through the first fluid path 11, the tip of the core attachment / detachment piston 17 comes into contact with the slide ring 7. If the flow of the compressed fluid continues in this contact state, the core attaching / detaching piston 17 moves forward against the repulsive force of the spring 6, and the slide ring 7 moves to the opposite side of the core attaching / detaching piston 17. . FIG. 5 shows a state where the core attaching / detaching piston 17 has been fully advanced.

  The inclined surfaces of the chuck chip 6 and the slide ring 7 are in contact with each other by magnetic force, and the chuck chip 6 is settled when the slide ring 7 moves to the opposite side of the core attaching / detaching piston 17, and is integrated with the chuck chip 6. The nail 5 is retracted into the opening 30. In this state, since the engagement between the claw 5 and the inner peripheral surface of the core 10 is released, the core 10 can be removed from the winding unit 3.

  The structure shown in FIGS. 4 and 5 is a structure in which when the fixing of the core 10 is released, the compressed fluid is circulated through the first fluid passage 11 and the slide ring 7 is pressed by the core attaching / detaching piston 17. In the present invention, the compressed fluid may be used for at least one of fixing and releasing the winding core 10. In the present invention, when the core 10 is fixed, a structure in which the core attaching / detaching piston 17 presses the slide ring 7 may be employed. However, when the sheet is wound, the core attaching / detaching piston 17 presses the slide ring 7. In view of the fact that this causes extra friction, and that the inner diameter of the core 10 is uneven, a difference in the friction state is likely to occur between the cores 10. May affect rotation. Therefore, as shown in FIGS. 4 and 5, it is preferable that the core attaching / detaching piston 17 presses the slide ring 7 when the fixing of the core 10 is released.

  Further, if the core attaching / detaching piston 17 and the slide ring 7 come into contact with each other when winding the sheet, there is a possibility that the winding tension varies. More preferably, the pressure is reduced by vacuum suction so that the core attaching / detaching piston 17 and the slide ring 7 are completely separated from each other.

  The chuck mechanism of the present invention only needs to be able to raise and lower the chuck tip 6 by moving the slide ring 7 using compressed fluid. In the examples of FIGS. 4 and 5, the inclined surface is used. However, it is not limited to this. For example, the chuck chip 6 and the slide ring 7 may be connected by a connecting rod or the like to raise and lower the chuck chip 6. Even in the case of using the inclined surface, the inclined surfaces are brought into contact with each other by magnetic force in the examples of FIGS. 4 and 5, but by pressing the chuck chip 6 using an urging means such as a rubber ring or a coil spring. You may contact | abut.

  As described above, the fixing and unlocking of the core 10 have been described. When the sheet is wound around the core 10 by the sheet winding shaft 1, in order to transmit the rotation of the base shaft 2 to the winding unit 3 and wind it up, That mechanism is required. In the sheet winding shaft 1, when the rotation of the base shaft 2 is transmitted to the winding unit 3, the winding tension is adjusted by using the friction and controlling the friction state. For example, when the sheet is wound with a low winding tension, the frictional state is weakened. On the other hand, when no winding tension is required, specifically, when the core 10 is attached to the winding unit 3 or when the core 10 is removed from the winding unit 3, the friction is not applied. 2 and the winding unit 3 may be relatively rotatable.

  Hereinafter, a mechanism for transmitting the rotation of the base shaft 2 to the winding unit 3 will be described with reference to FIG. 6 is a cross-sectional view taken along line BB in FIG. In FIG. 6, an annular cylinder ring 13 is fixed to the base shaft 2 via a seal ring 28 so as to surround the outer periphery of the base shaft 2. The cylinder ring 13 is the same as the cylinder ring 13 in FIGS. 4 to 5, but the sectional structure of the cylinder ring 13 shown in FIG. 6 is different from the sectional structure of the cylinder ring 13 shown in FIGS. 4 to 5. Is different. As will be described in detail later, the rotational torque is adjusted by changing the pressing force of the rotational torque adjusting piston 24.

  The facing member 31 is a member that constitutes the winding unit 3, is opposed to the rotational torque adjusting piston 24, and includes a friction part 19 that faces the tip of the rotational torque adjusting piston 24. In FIG. 6, the friction portion 19 forms a plane parallel to the diametrical section of the base shaft 2. The tip of the rotational torque adjusting piston 24 and the friction portion 19 are both flat, and these flat surfaces are opposed to each other, so that the tip of the rotational torque adjusting piston 24 and the friction portion 19 come into contact with each other evenly and stably. Contact is possible.

  In the present embodiment, the friction part 19 with which the tip of the rotational torque adjusting piston 24 abuts is described in the example provided in the winding part 3 incorporating the rotational torque adjusting piston 24. However, the present invention is not limited to this. Instead, an adjacent surface of the winding unit 3 adjacent to the winding unit 3 may be used as the friction unit 19. In this case, foreign matter is likely to be caught between the tip of the rotational torque adjusting piston 24 and the friction part 19, so that the friction part 19 is preferably provided in the same winding part 3 as shown in FIG. Whether or not to be selected may be appropriately selected according to design constraints and the like.

  In the present invention, it is only necessary that the tip of the rotational torque adjusting piston 24 and the surfaces of the friction portion 19 face each other, and the friction portion 19 is not limited to a configuration parallel to the diametrical cross section. From the viewpoints of stable contact with the friction part 19 even when rotating in the cylinder ring 13 and that the parallelism is maintained even if some wear occurs, the friction part 19 is parallel to the diametrical cross section. Preferably there is.

  The material of the rotational torque adjusting piston 24 and the friction portion 19 is appropriately selected, but as will be described later, when the sheet is being wound, friction is generated during that time, so that it is difficult to wear. The material is preferably a material, and either the rotational torque adjusting piston 24 or the friction portion 19 is preferably selected from a composite material such as graphite or a synthetic resin suitable for the friction material, and the other is preferably formed of a metal. Further, from the viewpoint of forming a groove on the flat surface when the friction portion 19 is worn, it is more preferable that the friction portion 19 is made of metal to make it more difficult to wear.

  In FIG. 6, when the base shaft 2 rotates, the cylinder ring 13 fixed to the base shaft 2 also rotates together. On the other hand, the base shaft 2 is fixed to the inner ring of the bearing 20, the facing member 31 and the ring body 32 are fixed to the outer ring of the bearing 20, and the winding portion 3 including the facing member 31 and the ring body 32, the base shaft 2, Are independently rotatable.

  The state of FIG. 6 is a state in which the tip of the rotational torque adjusting piston 24 presses the friction part 19, but if the force that presses the frictional part 19 is hardly applied to the rotational torque adjusting piston 24, Since the rotation of No. 2 is hardly transmitted to the winding unit 3, when the rotation of the base shaft 2 is not transmitted to the winding unit 3, it is not always necessary to separate the tip of the rotational torque adjusting piston 24 from the friction unit 19. .

  Hereinafter, a state where the rotation of the base shaft 2 is transmitted to the winding unit 3 will be specifically described. In FIG. 6, a second fluid path 25 through which a compressed fluid flows is formed in the base shaft 2, and a connection hole 26 branches in the middle of the second fluid path 25. The cylinder ring 13 is formed with a second cylinder chamber 21 that houses the rotational torque adjusting piston 24. The second cylinder chamber 21 is partitioned into a bottom side space 22 and a rod side space 23 by a rotational torque adjusting piston 24. A fluid supply / discharge path 26 is formed in the cylinder ring 13. One end of the fluid supply / discharge passage 26 is open to the base shaft 2 side, and the other end is connected to the bottom side space 22.

  In this state, when a compressed fluid such as air is circulated through the second fluid path 25, the compressed fluid flows into the fluid supply / discharge path 26 through the connection hole 12 and then flows into the bottom space 22. As a result, the tip of the rotational torque adjusting piston 24 presses the friction portion 19. In the present embodiment, the axial direction of the base shaft 2 includes not only a direction that completely matches the axis of the base shaft 2 but also a direction that substantially matches.

  When the tip of the rotational torque adjusting piston 24 presses the friction portion 19, the cylinder ring 13 and the facing member 31 are connected via the rotational torque adjusting piston 24. In this state, when the base shaft 2 and the cylinder ring 13 integrated therewith rotate, friction occurs between the rotational torque adjusting piston 24 and the friction portion 19, so that the winding portion 3 rotates. In this case, since the core 10 fixed to the winding unit 3 also rotates, the sheet is wound around the core 10.

  By controlling the force with which the rotational torque adjusting piston 24 presses the friction part 19, the frictional force generated between the rotational torque adjusting piston 24 and the friction part 19 is controlled. The rotational torque is controlled and the winding tension is adjusted. Generally, it is appropriate to change the winding tension at the time of winding the sheet around the winding core 10 according to the winding diameter of the wound sheet. Control according to tension and winding diameter.

  In FIG. 6, in order to increase the rotational torque, the amount of compressed fluid flowing into the second fluid path 25 in the base shaft 2 is increased, the force with which the rotational torque adjusting piston 24 presses the friction portion 19 is increased, and the rotational torque is increased. The frictional force generated between the adjustment piston 24 and the friction part 19 is increased. Conversely, in order to weaken the rotational torque, the amount of compressed fluid is controlled, the force with which the rotational torque adjusting piston 24 presses the friction part 19 is weakened, and the frictional force generated between the rotational torque adjusting piston 24 and the friction part 19 is weakened. . That is, the control of the rotational torque in FIG. 6 is based on the control of the frictional force between the rotational torque adjusting piston 24 and the friction part 19, and the friction is controlled while the winding is performed. In order to precisely control the rotational torque of a thing, it is important that the unevenness of friction hardly occurs.

  In the present embodiment, the rotational torque adjusting piston 24 presses the friction portion 19 in the axial direction of the base shaft 2, so that the contact state between the tip of the rotational torque adjusting piston 24 and the friction portion 19 is easily stabilized and the friction is stabilized. The winding tension can be adjusted precisely. In addition, even when a plurality of cores 10 are mounted on the same sheet winding shaft 1 and the sheet is wound, the difference in winding tension between the cores 10 is reduced, and the sheet is uniformly wound around the plurality of cores 10. I can take it. In addition to the contact state between the tip of the rotational torque adjusting piston 24 and the friction portion 19, the tip of the rotational torque adjusting piston 24 and the tip of the rotational torque adjusting piston 24 Lubricating oil may be disposed on the contact surface between the tip of the rotational torque adjusting piston 24 and the friction portion 19 by applying or impregnating the lubricating oil to the friction portion 19.

  Hereinafter, the arrangement of the core attaching / detaching piston 17 and the rotational torque adjusting piston 24 around the base shaft 2 will be described with reference to FIG. 7 is a cross-sectional view taken along the line BA in FIG. The configuration above the base shaft 2 in FIG. 7 (arrangement portion of the rotational torque adjusting piston 24) is the configuration above the base shaft 2 in FIG. 7 is lower than the base shaft 2 in FIG. 7 (the arrangement portion of the core attaching / detaching piston 17) is lower than the base shaft 2 in FIG. 4 which is a cross-sectional view taken along the line AA in FIG. It is the same as the arrangement part of the configuration (core core attaching / detaching piston 17).

  That is, in the circumferential direction of the cylinder ring 13 that is an annular body, the rotational torque adjusting piston 24 and the core attaching / detaching piston 17 are mixedly arranged. According to this configuration, the rotational torque adjusting piston 24 and the core attaching / detaching piston 17 do not extend in the axial direction of the base shaft 2, so that the width of the winding unit 3 can be suppressed small. Accordingly, a sheet having a narrow width can be wound, and a winding tension difference due to the width of the winding unit 3 can be suppressed.

  In the embodiment, the cylinder ring 13 is covered by the winding unit 3 and is built in the winding unit 3. More specifically, the cylinder ring 13 is disposed inside the collar 4, and the cylinder ring 13 is not exposed from the collar 4. According to this configuration, even if the inner surface of the core 10 contacts the outer peripheral surface of the collar 4 due to the deformation of the core 10, the core 10 does not contact the cylinder ring 13, so that dust or the like is generated due to rubbing. It is possible to prevent foreign matter from entering the mechanism of the winding unit 3. Further, since the core 10 can be mounted on the collar 4 without the inner surface of the core 10 being in contact with the cylinder ring 13, it is possible to prevent the core 10 from being mounted in a significantly inclined state. Furthermore, if the cylinder ring 13 is covered with the collar 4, the core 10 does not contact the cylinder ring 13, and the collar 4 only takes a set rotational torque, which is advantageous for safety. If a part of the cylinder ring 13 is exposed, the exposed part is rotated by the driving torque of the base shaft 2, and if this is touched, a rolling accident may occur.

  As mentioned above, although embodiment of this invention was described, these are examples and may be changed suitably. For example, the number of winding portions 3 attached to one base shaft 2 may be set as appropriate, and the numbers of the core attaching / detaching piston 17 and the rotational torque adjusting piston 24 may be set as appropriate.

DESCRIPTION OF SYMBOLS 1 Sheet winding shaft 2 Base shaft 3 Winding part 5 Claw 6 Chuck chip 7 Slide ring 8 Spring 9 Chuck mechanism 10 Core 11 First fluid path 13 Cylinder ring 17 Core attaching / detaching piston 19 Friction part 24 Rotation torque adjustment piston

Claims (5)

A sheet take-up shaft for taking up the sheet around the core;
A base shaft having a first fluid path and a second fluid path through which the compressed fluid flows;
A winding part externally fitted to the base shaft in a state rotatable relative to the base shaft;
A cylinder ring externally fitted to the base shaft in a state of being fixed to the base shaft;
A core detachable piston built in the cylinder ring and slid by the compressed fluid flowing in from the first fluid path;
A rotational torque adjusting piston built in the cylinder ring and slid by the compressed fluid flowing in from the second fluid path;
The winding unit is
A chuck mechanism for fixing and releasing the fixing of the winding core to and from the winding portion by sliding the winding core attaching / detaching piston;
A friction part facing the rotational torque adjustment piston,
The sliding direction of the rotational torque adjusting piston is the axial direction of the base shaft,
The sheet winding shaft, wherein the rotational torque adjusting piston presses the friction portion, and rotation of the base shaft is transmitted to the winding portion by friction between the rotational torque adjusting piston and the friction portion.   The seat winding according to claim 1, wherein the cylinder ring is an annular body surrounding the base shaft, and the rotational torque adjusting piston and the core attaching / detaching piston are mixedly arranged in a circumferential direction of the cylinder ring. A handle.   The sheet winding shaft according to claim 1, wherein the cylinder ring is covered by the winding unit and is built in the winding unit.   The seat according to any one of claims 1 to 3, wherein the base shaft and the winding portion are rotatable relative to each other by a bearing, and the bearing is disposed at a position sandwiching the cylinder ring in an axial direction of the base shaft. Winding shaft. The sheet winding shaft according to any one of claims 1 to 4, wherein the chuck mechanism is provided with a slide ring, and the winding core attaching / detaching piston presses the slide ring to release the fixing of the core. .

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