Sheet winding shaft

Abstract

The sheet winding shaft of the present invention includes: a base shaft (2); a plurality of winding parts (3) arranged and externally fitted on the base shaft (2); a rotational torque adjusting unit (23) that adjusts the rotational torque between the winding part (3) and the base shaft (2). The winding part (3) includes: a friction ring (4) having a plurality of inclined parts (41) that undulate in the axial circumferential direction on the outer circumference; an outer sleeve (5) that internally fits the friction ring (4); a holding member (6) that is embedded in an opening (51) of the outer sleeve (5) and moves along the inclined part (41), and when located at a raised part (45) of the inclined part (41), protrudes to the outside of the outer sleeve (5) to hold the core (10); a rotation prevention unit that can limit the relative rotation of the friction ring (4) and the outer sleeve (5). The holding member (6) includes: a contact part (63) that contacts the inner circumference of the core (10); a hooking part (62) that engages with the friction ring (4) when located at a depression part (46) of the inclined part (41).

Description

Technical Field

[0001] The present invention relates to a sheet winding shaft for winding a sheet. Background Art

[0002] In order to wind a sheet such as a narrow-width paper or film obtained by slitting, a sheet winding shaft can be used. For example, a winding shaft known as a friction winding shaft is known. The friction winding shaft has a structure in which a plurality of winding parts are externally fitted on a base shaft so that they can rotate relatively, and the rotation of the base shaft is transmitted to the winding parts via a rotation torque adjusting member. A core (e.g., a paper tube) is fixed to the winding part, and the slit sheet is wound around the core fixed to the winding part.

[0003] If there is no structure for transmitting the rotation torque to the winding part as described above, and a plurality of cores are fixed to the base shaft and rotated in the same manner to wind the sheet, due to the uneven thickness of the sheet, etc., the tension is concentrated on the winding product with a slightly larger outer diameter, and there is a large difference in the winding tension of each winding product, which causes poor winding of the winding product.

[0004] On the other hand, the above-mentioned friction winding shaft can transmit the same rotation torque even for winding products with slightly different outer diameters due to uneven sheet thickness, etc., and can prevent the tension from being concentrated on the winding product with a slightly larger outer diameter. In addition, by controlling the air pressure flowing into the rotation torque adjusting member, a rotation torque corresponding to the winding diameter of the winding product can be applied to the core. As a result, an optimal winding tension corresponding to the outer diameter can be provided to the sheet.

[0005] There are several methods for fixing the core to the winding part on this friction winding shaft. For example, in Patent Document 1, locking claws are previously arranged on the inclined part of a sliding ring inside the winding part, and the position of the sliding ring is operated by a piston so that the locking claws can protrude from and retract into the winding part to fix and release the core. The piston can protrude by the inflow of compressed air from a spring or a winding rotating shaft member installed on the sliding ring. On this winding shaft, the locking claws usually protrude, and when removing the core, compressed air is made to flow in to make the locking claws retract.

[0006] In Patent Document 2, rollers are arranged in the recessed part provided on the outer peripheral surface side of the sleeve, and the protrusion and retraction of the rollers from the opening of the cover ring are switched when the rollers are in the shallow part and the deep part of the recessed part to fix and release the core. On this winding shaft, by rotating the cover ring relative to the friction ring (sleeve) in the direction opposite to the winding rotation, the rollers protrude from the opening and the core is fixed, and by rotating the cover ring relative to the friction ring in the winding rotation direction, the rollers are made to retract, thereby releasing the fixing of the core.

[0007] Prior Art Documents

[0008] Patent Documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2005-15170

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 11-208942 Summary of the invention

[0011] Technical problem to be solved by the invention

[0012] The winding shaft described in Patent Document 1 transmits the rotational torque of the winding portion to the core by locking the core with a part of the winding portion, namely, a locking claw. At this time, if the number of winding portions corresponding to each core is different for each core, a rotational torque difference is generated on each core for this reason. If any locking claw can be set to a submerged state, the number of locking claws of the winding portion corresponding to each core can be easily made consistent. In addition, if a part of the locking claw is in a state of slightly contacting the core, a part of the core will be cut off, which will also become a cause of foreign matter mixing. From these reasons, it is not limited to the winding shaft of Patent Document 1, and it is preferable that any locking claw of each winding portion on the friction winding shaft can be maintained in a submerged state.

[0013] In this regard, when compressed air flows in while maintaining the structure described in Patent Document 1, the locking claws of all winding parts are in a submerged state, and when the inflowing compressed air is discharged, the locking claws of all winding parts are in a protruding state. In the winding shaft described in Patent Document 1, for example, if an operation can be performed so that the position of the sliding ring of an arbitrarily selected winding part can be fixed at the position when compressed air flows in, it is possible to maintain only the locking claw of the winding part after the arbitrarily fixed operation in a submerged state.

[0014] On the other hand, the winding shaft described in Patent Document 1 has the advantages of not having any restrictions on the direction of rotation when the locking claw locks the winding core, or reliably locking the winding core even under low torque. However, on the other hand, the number of parts is large and the structure is complex, which not only makes assembly and maintenance cumbersome, but is also disadvantageous in terms of durability or cost, and requires a simpler structure.

[0015] In contrast, the winding shaft described in Patent Document 2 is a simpler structure than the winding shaft described in Patent Document 1 and can be manufactured at a low cost. However, the winding shaft described in Patent Document 2 is a structure in which the winding core is clamped to the sleeve by inserting a roller between the winding core and the shallow part of the recessed part. In this structure, if the roller does not protrude sufficiently from the cover ring, the winding core cannot be clamped. If the diameter of the roller is increased in order to obtain a sufficient protrusion, since the diameter of the winding shaft is specified, the diameter of the shaft encircled by the winding part has to be reduced, making it difficult to maintain the strength of the shaft.

[0016] In order to obtain a sufficient protruding amount, it is also possible to consider thinning the cover ring. However, the cover ring has an opening portion at the top of the gap portion sized to allow a part of the roller to protrude in order to prevent the roller from falling off. If the cover ring is thinned and the opening is enlarged to a size close to the outer shape of the roller, the roller will be locked in the opening portion. In the winding shaft of Patent Document 2, it is necessary to consider these balances in the design, resulting in design limitations.

[0017] In addition, in the winding shaft of Patent Document 2, it is also required to maintain the rollers of any selected winding portion in a state of being submerged. For example, for any selected cover ring, if the sleeve and the cover ring can be fixed while the roller is in the deep part of the recessed portion, it can be considered that the roller maintains the state of being submerged. However, when only the fixing of the sleeve and the cover ring is enabled and winding is performed at high speed, due to the centrifugal force generated by the rotation of the winding shaft, there will be a problem that the roller protrudes and interferes with the core.

[0018] The present invention has been completed to solve the above problems, and an object thereof is to provide a sheet winding shaft having a structure that is easy to assemble or maintain, and at the same time, the appearance and disappearance of the gripping member for fixing the core can be arbitrarily selected for each winding portion.

[0019] Solution for solving the above technical problems

[0020] To achieve the above object, a sheet winding shaft of the present invention is a sheet winding shaft for winding a sheet around a core, and is characterized by including: a base shaft; a plurality of winding portions arranged and externally fitted on the base shaft; a rotational torque adjusting unit that adjusts the rotational torque between the winding portion and the base shaft, the winding portion including: a friction ring having a plurality of inclined portions that undulate in the axial circumferential direction on the outer circumference; an outer sleeve that internally embeds the friction ring; a gripping member that is embedded in an opening of the outer sleeve and moves along the inclined portion, and when located at the raised portion of the inclined portion, grips the core by protruding to the outside of the outer sleeve; a rotation prevention unit that can restrict the relative rotation of the friction ring and the outer sleeve, the gripping member including: a contact portion that contacts the inner circumference of the core; a hooking portion that engages with the friction ring when located at the sunken portion of the inclined portion.

[0021] According to this configuration, it can be configured with fewer components than a winding shaft that uses compressed air to fix and release the core, making assembly and maintenance easier. In addition, when installing multiple cores on a sheet winding shaft having multiple winding parts, if the outer casing is rotated for a selected specific winding part so that the holding member is located at the settling part of the inclined part of the friction ring, the hooking part of the holding member can be engaged with the friction ring. In addition, through the rotation prevention unit, the relative rotation of the outer casing and the friction ring can be restricted. Therefore, for the selected specific winding part, the state where the holding member is buried and the hooking part of the holding member is engaged with the friction ring can be maintained. Therefore, even if the winding part rotates at high speed, it is possible to prevent the holding member from protruding from the outer surface of the outer casing due to centrifugal force. That is, when installing multiple cores on a sheet winding shaft, by burying the abutting part for a specific winding part, the number of abutting parts abutting against each core can be made the same, so that the winding torque for each core can be made more uniform.

[0022] In the sheet winding shaft of the present invention, preferably, the holding member has a magnetic body at a portion abutting against the inclined portion of the friction ring. According to this configuration, the holding member slides along the inclined portion by the magnetic body. When the holding member is located at the settling part, the holding member is in a sunken state, and it can be guided so that the hooking part of the holding member is hooked at a specified position of the friction ring.

[0023] In addition, it is preferable that a plunger that abuts against the inner circumference of the core is provided on the outer casing. According to this configuration, by the plunger abutting against the inner circumference of the core, if the core is manually rotated, the outer casing also rotates together with it, so the rotation operation of the outer casing becomes easy. In addition, by arranging a part of the plunger in the groove formed in the friction ring, the plunger can also be used as a fastener for holding the friction ring and the outer casing in a proper position.

[0024] In addition, it is preferable that an engaging convex portion is formed on the outer peripheral surface of the friction ring, a protrusion that engages with the hooking part of the holding member is formed on one end side of the engaging convex portion, and an abutting surface that abuts against the rotation prevention unit is formed on the other end side. According to this configuration, the rotation of the outer casing on the friction ring can be restricted by a simple operation, and it becomes easy to leave the holding member at the settling part of the inclined portion. In addition, when the holding member protrudes by a certain amount, the protrusion of the holding member can be restricted by making the holding member abut against the abutting surface of the engaging convex portion, and it is also possible to reliably prevent the locking of the holding member caused by the convex portion (flange) of the holding member being clamped between the friction ring and the outer casing when the holding member protrudes too much.

[0025] Furthermore, it is preferably that the friction ring has a narrow groove extending in the axial length direction, and the relative rotation of the friction ring and the outer casing is restricted by the engagement of the narrow groove with the rotation prevention unit. According to this configuration, it is also possible to restrict the rotation of the outer casing on the friction ring by a simple operation, and it becomes easy to leave the holding member in the settling portion of the inclined portion. In this configuration, the engaging convex portion may not be formed.

[0026] Advantages of the Invention

[0027] As described above, the effect of the present invention is that it can be configured with fewer components than a winding shaft that uses compressed air for the fixing and releasing operations of the core, and assembly or maintenance becomes easy. In addition, when installing a plurality of cores on a sheet winding shaft having a plurality of winding portions, if the outer casing is rotated for a specific selected winding portion so that the holding member is located in the settling portion of the inclined portion of the friction ring, the hooking portion of the holding member can be engaged with the friction ring. In addition, through the rotation prevention unit, the relative rotation of the outer casing and the friction ring can be restricted, so that for the specific selected winding portion, the state where the holding member is buried and the hooking portion of the holding member is engaged with the friction ring can be maintained. Therefore, even if the winding portion is rotated at high speed, it is possible to prevent the holding member from protruding from the outer surface of the outer casing due to centrifugal force. That is to say, when installing a plurality of cores on a sheet winding shaft, by burying the abutting portion for a specific winding portion, the number of abutting portions in contact with each core can be made the same, so that the winding torque for each core can be made more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic view showing the appearance of a sheet winding shaft according to the first embodiment of the present invention.

[0029] Figure 2 is Figure 1 an external perspective view of one of the winding portions shown.

[0030] Figure 3 is for Figure 2 the winding portion shown, showing an external perspective view of its internal structure.

[0031] Figure 4 is Figure 1 a sectional view taken along line AA of

[0032] Figure 5 is Figure 4 a sectional view taken along line DD of

[0033] Figure 6 is a sectional view of the sheet winding shaft in a state where the holding member is completely buried in the first embodiment of the present invention.

[0034] Figure 7 isFigure 2 Cross-sectional view of the BB wire.

[0035] Figure 8 Is a perspective view showing the engagement state of the friction ring with the holding member and the rotation prevention unit in the first embodiment of the present invention.

[0036] Figure 9 Is a perspective view showing the rotation prevention unit and its accessory components in the first embodiment of the present invention.

[0037] Figure 10 Is a schematic diagram showing the process of the state where the relative rotation of the friction ring and the outer casing is restricted by the operation of the rotation prevention unit in the first embodiment of the present invention.

[0038] Figure 11 Is a perspective view showing another example of the rotation prevention unit in the first embodiment of the present invention.

[0039] Figure 12 Is Figure 2 Cross-sectional view of the CC wire.

[0040] Figure 13 Is a perspective view showing the engagement state of the friction ring with the holding member and the rotation prevention unit in the second embodiment of the present invention.

[0041] Figure 14 Is a cross-sectional view of the sheet winding shaft in which the holding member is in a protruding state in the second embodiment of the present invention.

[0042] Figure 15 Is a cross-sectional view of the sheet winding shaft in a state where the holding member is completely buried in the second embodiment of the present invention.

[0043] Figure 16 Is a cross-sectional view near the rotation prevention unit in the second embodiment of the present invention.

[0044] Figure 17 Is shown in Figure 14 A schematic diagram of the state in which the holding member protrudes until it abuts against the abutting surface of the holding member and the engaging convex portion near the holding member. Detailed Embodiments

[0045] Hereinafter, a sheet winding shaft according to an embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments are roughly divided into a first embodiment and a second embodiment. First, the first embodiment will be described, and then the second embodiment will be described. Figure 1It is a schematic diagram showing the appearance of the sheet winding shaft 1 according to the first embodiment of the present invention. The sheet winding shaft 1 is a winding shaft obtained by arranging and externally fitting a plurality of winding portions 3 with respect to the base shaft 2. The winding portion 3 and the base shaft 2 can rotate relative to each other. The sheet winding shaft 1 can be used as a sheet winding shaft of a slitter (not shown). The wide sheet is slit into narrow sheets by the slitter. The narrow sheets are wound around a core 10 such as a paper tube mounted on the sheet winding shaft 1 (refer to Figure 4 ).

[0046] Figure 2 Is Figure 1 An external perspective view of one of the winding portions 3 shown. Figure 3 Is for Figure 2 The winding portion 3 shown shows an external perspective view of its internal structure. Figure 4 Is Figure 1 The sectional view of the AA line of Figure 5 Is Figure 4 The sectional view of the DD line of Figure 4 And Figure 5 Show the state in which the holding member 6 protrudes to hold the core 10.

[0047] The details of the winding portion 3 will be described later. Refer to Figure 2 And Figure 3 For a brief description. In Figure 2 , the winding portion 3 has an external appearance formed by an outer casing 5. On the cylindrical surface of the outer casing 5, a holding member 6, a rotation prevention unit 7, and a plunger 8 are arranged. At both ends of the outer casing 5, bearings 9 fixed to the base shaft 2 (refer to Figure 5 ) are arranged. Inside the outer casing 5, a friction ring 4 that can rotate relative to the outer casing 5 is arranged.

[0048] Figure 3 Shows the state in which the bearings 9 and the friction ring 4 are removed for the winding portion 3 shown in Figure 2 . In Figure 2 , the holding member 6 is arranged in an opening 51 formed in the outer casing 5. As Figure 3 Shown, on the inner peripheral surface side of the outer casing 5, the holding member 6 is also arranged in the opening 51. Therefore, as shown in Figure 8 Shown, the holding member 6 can abut against the friction ring 4 arranged inside the outer casing 5.

[0049] In Figure 4 , the winding portion 3 mainly consists of a friction ring 4, an outer casing 5, and a holding member 6. The friction ring 4 is embedded in the outer casing 5, and the holding member 6 is buried in the outer casing 5. As Figure 5 Shown, a bearing 9 is interposed between the winding portion 3 and the base shaft 2, and the winding portion 3 and the base shaft 2 can rotate relative to each other.

[0050] In Figure 4 and Figure 5 a fluid passage 21 through which compressed fluid flows is formed in the base shaft 2. A connecting hole 22 branches off midway in the fluid passage 21, and a rotational torque adjusting unit 23 constituted by a piston is provided in the connecting hole 22. When compressed fluid flows through the base shaft 2, the rotational torque adjusting unit 23 is pressed in a direction protruding outward from the base shaft 2. By this pressing, the top of the rotational torque adjusting unit 23 comes into contact with the inner circumference of a friction ring 4 of a winding part 3 externally fitted to the base shaft 2, thereby generating friction. Through this friction, the rotational torque of the base shaft 2 is transmitted to the winding part 3, and while the rotational torque can be adjusted between the winding part 3 and the base shaft 2, a sheet can be wound around a core 10 mounted on the winding part 3.

[0051] As Figure 4 shown, the inner circumference of the friction ring 4 is in the shape of a perfect circular ring so that the rotational torque adjusting unit 23 abuts evenly, but the outer circumference is provided with a plurality of undulations. Specifically, the friction ring 4 is formed with a gentle inclined part 41 whose wall thickness gradually thins along its axial circumferential direction. In this case, one end of the inclined part 41 becomes a raised part 45 and the other end becomes a sunken part 46. The friction ring 4 has four inclined parts 41, and the raised parts 45 and the sunken parts 46 are formed alternately along the axial circumference.

[0052] As Figure 4 shown, the friction ring 4 has a protrusion 44 at a part where it changes from a thin-walled sunken part 46 to a thick-walled part. The protrusion 44 is formed such that its tip protrudes in the axial circumferential direction of the friction ring 4. Details will be described later, and the protrusion 44 is used for engaging with a hooking part 62 of a holding member 6.

[0053] In Figure 4 , an outer sleeve 5 is in the shape of a circular ring and is installed between it and the base shaft 2 via a bearing 9 (refer to Figure 5 ), and the friction ring 4 is internally fitted so as to be able to rotate relative to the friction ring 4. As Figure 4 and Figure 5 shown, the outer sleeve 5 has an opening 51 for the holding member 6 to protrude, and the holding member 6 is inserted into the opening 51 so that one end of the holding member 6 can protrude from the opening 51. As Figure 5 shown, it is also possible to provide a convex part 61 (flange) for preventing falling (detachment) on the holding member 6. The convex part 61 may be provided so as to protrude a part of the outer circumference of the holding member 6. The shape of the opening 51 is arbitrary and can be appropriately determined in consideration of the shape of the part where the holding member 6 protrudes or the size of the convex part 61 provided on the holding member 6.

[0054] As Figure 4 and Figure 5As shown, the abutting portion 63 formed at one end of the holding member 6 protrudes from the opening 51. The abutting portion 63 is the portion that abuts against the inner circumference of the core 10, as Figures 1 - 3 shown, and is a rounded rectangular shape with chamfered corners when viewed from above. In addition, as Figure 4 and Figure 5 shown, in order to improve the holding force with the core 10, claws are formed in the abutting portion 63. The shape of the abutting portion 63 may be appropriately determined as the optimal shape according to the material of the core 10. The presence or absence of claws is also arbitrary, and is not limited to claws. Concavities and convexities such as horizontal stripes, vertical stripes, diamonds, and grids may be formed, or an elastic material may be arranged.

[0055] As Figure 4 shown, the holding member 6 is arranged at a position corresponding to the inclined portion 41 of the friction ring 4, and a curved surface is formed on the bottom surface side that abuts against the inclined portion 41. Thus, the contact area between the holding member 6 and the inclined portion 41 is suppressed to be small, and the holding member 6 can move smoothly on the inclined portion 41.

[0056] In addition, as Figure 3 and Figure 5 shown, a magnetic body 64 (permanent magnet) is arranged at the portion where the holding member 6 abuts against the inclined portion 41 of the friction ring 4 (the bottom surface side of the holding member 6). The magnetic body 64 is a magnetic body for moving the holding member 6 along the inclined portion 41. Instead of the magnetic body 64, a structure may be provided in which the holding member 6 is pressed by an annular spring or a rubber ring, etc. However, an annular spring or the like needs to be accommodated in the outer casing 5 or the holding member 6, resulting in a complicated structure of the outer casing 5 or the holding member 6. In the case of the magnetic body 64, it is easy to slide and move along the inclined portion 41, and thus it is also easy to guide the protrusion 44 described later.

[0057] In Figure 4 , the holding member 6 is located at the raised portion 45 of the friction ring 4, and the abutting portion 63 is in a state of protruding from the outer peripheral surface of the outer casing 5. In this way, when the abutting portion 63 is in a protruding state, the core 10 mounted on the winding portion 3 is fixed.

[0058] In Figure 4 , the friction ring 4 and the outer casing 5 can rotate relative to each other. If the outer casing 5 is rotated relative to the friction ring 4, the holding member 6 moves along the inclined portion 41 while maintaining contact with the friction ring 4 by the magnetic force of the magnetic body 64. As this movement progresses, the holding member 6 approaches the settling portion 46 of the inclined portion 41, and the embedding of the holding member 6 in the opening 51 is advanced.

[0059] Figure 6 A cross-sectional view of the sheet winding shaft 1 in a state where the holding member 6 is completely embedded is shown. In Figure 6In the state where , the holding member 6 is completely buried within the opening 51, and the abutting portion 63 of the holding member 6 does not protrude from the outer peripheral surface of the outer sleeve 5. In this state, the abutting portion 63 is separated from the core 10, and the fixation of the holding member 6 to the core 10 is released.

[0060] In Figure 6 , the holding member 6 maintains the state of being completely buried within the opening 51. In order to restrict the movement of the abutting portion 63 of the holding member 6 in the direction of protruding from the outer peripheral surface of the outer sleeve 5, it is only necessary to restrict the relative rotation of the friction ring 4 and the outer sleeve 5. Therefore, in the present embodiment, as Figure 2 shows, the winding portion 3 is provided with a rotation prevention unit 7.

[0061] Next, the rotation prevention unit 7 will be specifically described with reference to Figures 7 - 9 . Figure 7 is Figure 2 a cross-sectional view of the BB line of . Figure 8 is a perspective view showing the engaged state of the friction ring 4, the holding member 6, and the rotation prevention unit 7. Figure 9 is a perspective view showing the rotation prevention unit 7 and its accessory components.

[0062] As Figure 7 shows, the rotation prevention unit 7 is housed in the housing portion 52 formed in the outer sleeve 5 via the mounting body 74, and the convex portion 71 of the rotation prevention unit 7 is engaged with the narrow groove 43 of the friction ring 4. An O-ring 77 for preventing rotation of the rotation prevention unit 7 is interposed between the rotation prevention unit 7 and the housing portion 52. As Figure 8 shows, the narrow groove 43 extends in the axial length direction of the friction ring 4. More specifically, as Figure 9 shows, the rotation prevention unit 7 is provided with a convex portion 71 at one end of a substantially cylindrical main body, and a flange 72 at the other end. The flange 72 is engaged with a notch formed in the disk-shaped mounting body 74, thereby supporting the rotation prevention unit 7 on the mounting body 74.

[0063] A hole 75 is formed in the mounting body 74, and a screw 76 inserted through the hole 75 is fastened to the outer sleeve 5. Thus, as Figure 2 shows, the rotation prevention unit 7 is mounted on the outer sleeve 5 with the flange 72 exposed to the outside. In Figure 9 , a transverse groove 73 is formed in the flange 72, and in Figure 2 , a tool is inserted into the transverse groove 73, and the rotation prevention unit 7 can be rotated.

[0064] Next, the operation of the rotation prevention unit 7 will be described with reference to Figure 10 . Figure 10 is a schematic view showing the process of reaching the state where the relative rotation of the friction ring 4 and the outer sleeve 5 is restricted by the operation of the rotation prevention unit 7.Figure 10 It is equivalent to being in Figure 8 , observing the friction ring 4 from the direction of arrow E. In Figure 10 , the rotation prevention unit 7 is shown in a simplified diagram. In each of the diagrams of Figure 10 , in the friction ring 4, a groove 42 extending in the circumferential direction of the axis and a narrow groove 43 crossing the friction ring 4 in the axial length direction are formed.

[0065] Figure 10 (a) of shows a state in which the rotation prevention by the rotation prevention unit 7 is released. In this state, since the convex portion 71 of the rotation prevention unit 7 is located in the groove 42, the rotation prevention unit 7 can move along the groove 42, and the outer sleeve 5 integrated with the rotation prevention unit 7 can also rotate.

[0066] Figure 10 (b) of shows a state in which the rotation prevention unit 7 is rotated from the state of Figure 10 (a). As described above, in Figure 2 , by inserting a tool into the cross groove 73, the rotation prevention unit 7 can be rotated. Figure 10 (c) of shows a state in which the rotation prevention unit 7 is further rotated from the state of Figure 10 (b). In this state, the convex portion 71 of the rotation prevention unit 7 is located in the narrow groove 43. This state is equivalent to the state of Figure 7 , in Figure 7 , the movement of the convex portion 71 is restricted within the narrow groove 43, the movement of the rotation prevention unit 7 is restricted, and the relative rotation of the outer sleeve 5 integrated with the rotation prevention unit 7 with respect to the friction ring 4 is also restricted.

[0067] The rotation prevention unit 7 in this embodiment is an example, and as long as the relative rotation between the friction ring 4 and the outer sleeve 5 can be restricted. For example, the rotation prevention unit 7 can be replaced with a pin or a screw. Figure 11 is a perspective view showing another example of the rotation prevention unit. The mounting body 91 is fixed to the outer sleeve 5 by a screw 92, and the mounting body 91 is located more inward than the outer surface of the outer sleeve 5. A long hole 93 is formed in the mounting body 91, and a pin-shaped rotation prevention unit 90 is disposed in the long hole 93.

[0068] A concave portion is formed at the upper end of the rotation prevention unit 90, and by inserting a tool into the concave portion, the rotation prevention unit 90 can be moved along the long hole 93. In Figure 11In the state where [description of the state], the lower end portion of the rotation prevention unit 90 is located within the narrow groove 43, the movement of the rotation prevention unit 90 is restricted, and the rotation of the outer casing 5 equipped with the rotation prevention unit 90 is also restricted. From this state, when a tool is inserted into the recess at the upper end portion of the rotation prevention unit 90 and the rotation prevention unit 90 is moved along the long hole 93, the lower end portion of the rotation prevention unit 90 can be brought into a state of being within the groove 42, and the rotation prevention state of the outer casing 5 is released.

[0069] As Figures 6 - 8 shown, when the holding member 6 is located at the settling portion 46 of the friction ring 4, the hooking portion 62 of the holding member 6 engages with the protrusion 44 of the friction ring 4. In this state, the movement of the holding member 6 in the direction protruding from the outer surface of the outer casing 5 is restricted. The hooking portion 62 is a concave depression for the convex protrusion 44 to fit into. The engaging structure between the holding member 6 and the friction ring 4 only needs to be able to restrict the protrusion of the holding member 6 from the outer surface of the outer casing 5, and other structures are also possible.

[0070] In Figure 7 and Figure 8 state, in addition to the hooking portion 62 of the holding member 6 engaging with the protrusion 44 of the friction ring 4, the convex portion 71 of the rotation prevention unit 7 is also located within the narrow groove 43. In this state, since the relative rotation between the outer casing 5 and the friction ring 4 is restricted, the state where the hooking portion 62 of the holding member 6 engages with the protrusion 44 of the friction ring 4 is maintained. Therefore, even if the winding portion 3 is rotated at high speed, it is possible to prevent the holding member 6 from protruding from the outer surface of the outer casing 5 due to centrifugal force.

[0071] Next, the plunger 8 (refer to Figures 1 - 4 , Figure 6 ) will be described. In Figures 1 - 4 , Figure 6 , a part of the plunger 8 protrudes from the outer casing 5. Figure 12 is Figure 2 the cross-sectional view of the CC line of Figure 12 . In

[0072] In Figure 12 , the sphere 81 protrudes from the outer surface of the outer casing 5, and a repulsive force of the spring 82 is applied to the sphere 81. In this state, as Figure 6 shown, if the core 10 is installed on the outer casing 5, the sphere 81 sinks toward the cylinder 83 side, and the core 10 is pressed by the sphere 81. Therefore, if the core 10 is rotated manually, the outer casing 5 also rotates together with it. The plunger 8 is provided to achieve this rotation.

[0073] The plunger 8 in this embodiment is an example. If a component with a repulsive force protrudes from the outer surface of the outer sleeve 5, the plunger 8 is not limited to a component having a spherical body 81 and a spring 82.

[0074] As Figure 12 shown, the cylinder 83 of the plunger 8 in this embodiment is fixed to the outer sleeve 5 and is disposed in the groove 42 of the friction ring 4. As described above, the relative rotation between the friction ring 4 and the outer sleeve 5 can be restricted by the rotation prevention unit 7. On the other hand, from the aspect that the contact between the inner ring of the bearing 9 and the friction ring 4 is suppressed, or the rotation prevention unit 7 is accurately disposed so that its convex portion 71 is easily hooked on the narrow groove 43, it is desirable to also restrict the shift of the positional relationship between the outer sleeve 5 and the friction ring 4 in the axial length direction. According to Figure 12 the configuration shown, the plunger 8 can move on the friction ring 4 integrally with the rotation of the outer sleeve 5. However, since the movement of the cylinder 83 located in the groove 42 in the direction crossing the groove 42 is restricted, the shift of the positional relationship between the outer sleeve 5 and the friction ring 4 in the axial length direction is restricted. In this embodiment, this restriction is achieved by the cylinder 83 of the plunger 8, but it may also be a configuration in which a fastening member such as a pin or a screw is inserted from the outer sleeve 5 into the groove 42 of the friction ring 4.

[0075] Hereinafter, the operation of the sheet winding shaft 1 will be described. First, the core 10 is passed through the winding portion 3. Figure 6 This is a cross-sectional view of the sheet winding shaft 1 in this state. When the core 10 is passed through the winding portion 3, as Figure 6 shown, it is previously set to a state where the holding member 6 is completely buried in the opening 51. In Figure 6 , if the base shaft 2 is fixed and it is previously set to a state where the rotation torque adjusting unit 23 presses the friction ring 4, the outer sleeve 5 can be rotated in the counterclockwise direction (arrow b direction) with the base shaft 2 and the friction ring 4 fixed.

[0076] In Figure 6 this state, as described above, by pressing the core 10 with the plunger 8, if the core 10 is manually rotated, the outer sleeve 5 also rotates therewith. If the outer sleeve 5 is rotated in the counterclockwise direction (arrow b direction), the holding member 6 also moves integrally therewith, and the holding member 6 reaches the position of the raised portion 45 of the friction ring 4. Figure 4 This is a cross-sectional view of the sheet winding shaft 1 in this state. In Figure 4In this case, the holding member 6 is located at the raised portion 45 of the friction ring 4, and the abutting portion 63 protrudes from the outer peripheral surface of the outer jacket 5 and abuts against the inner peripheral surface of the core 10. In this state, by rotating the base shaft in the clockwise direction (the direction of arrow a), the sheet can be wound around the core 10. When winding the sheet, by pressing the bottom of the holding member 6 by the raised portion 45 of the friction ring 4, the state where the holding member 6 abuts against the inner peripheral surface of the core 10 is maintained, and the outer jacket 5 rotates together with the friction ring 4 without sliding relative to the friction ring 4.

[0077] In Figure 1 this case, multiple cores 10 can be installed on the sheet winding shaft 1, and the sheet can be wound around multiple cores simultaneously. It is not limited to the case where the length of the core 10 is equal to the length of the winding portion 3, and there is also a case where one core 10 corresponds to multiple winding portions 3. In this case, if the number of the abutting portions 63 corresponding to each core 10 is inconsistent, the number of the abutting portions 63 that abut against each core 10 can be made consistent by burying the abutting portion 63 in a specific winding portion 3. In this case, the winding torque for each core 10 becomes more uniform.

[0078] Specifically, if the length and number of the cores 10 are known, the specific winding portion 3 where the abutting portion 63 needs to be buried can be grasped in advance. For this purpose, for this specific winding portion 3, before installing the core 10, as Figure 6 shown, it is preset to the state where the holding member 6 is completely buried in the opening 51, and through the operation of the rotation prevention unit 7, as Figure 7 and Figure 8 shown, it is preset to the state where the relative rotation between the friction ring 4 and the outer jacket 5 is restricted. Thereby, the number of the abutting portions 63 that abut against each core 10 can be made consistent, and the state where the hooking portion 62 of the holding member 6 engages with the protrusion 44 of the friction ring 4 is maintained, thereby preventing the holding member 6 that does not abut against the core 10 from protruding from the outer surface of the outer jacket 5 due to centrifugal force and contacting the core 10.

[0079] If the winding of the sheet around the core 10 is completed, starting from the Figure 4 state, the outer jacket 5 is rotated manually in the clockwise direction (the direction of arrow a), so as to become the Figure 6 state where the holding member 6 is buried. In this state, the wound product obtained by winding the sheet around the core 10 can be detached from the sheet winding shaft 1.

[0080] The first embodiment of the present invention has been described above. Next, the second embodiment of the present invention will be described. The basic configuration and operation of the second embodiment are the same as those of the first embodiment. The following will describe the parts different from the first embodiment. Figure 13It is a perspective view showing the engaged state of the friction ring 4a, the holding member 6a, and the rotation prevention unit 7 in the second embodiment. The friction ring 4a of the second embodiment is different in the shape of the wall thickness portion from the friction ring 4 (refer to Figure 8 ) of the first embodiment.

[0081] In Figure 13 , an engagement convex portion 47 is formed on the outer peripheral surface of the friction ring 4a. A protrusion 44a that engages with the hooking portion 62a of the holding member 6a is formed on one end side of the engagement convex portion 47, and an abutting surface 48 against which the convex portion 71 of the rotation prevention unit 7 abuts is formed on the other end side. The friction ring 4a is not provided with the groove 42 and the narrow groove 43 provided in the friction ring 4 shown in Figure 8 . Therefore, a long and gentle inclined portion 41a is formed between two adjacent engagement convex portions 47.

[0082] Figure 14 It is a cross-sectional view of the sheet winding shaft 1a of the second embodiment, which is equivalent to the cross-sectional view of Figure 4 of the first embodiment. In Figure 14 , the holding member 6a is located at the raised portion 45a of the friction ring 4a, and the abutting portion 63a is in a state of protruding from the outer peripheral surface of the outer casing 5a. The holding member 6a is provided with a magnetic body similar to the magnetic body 64 shown in Figure 3 and Figure 5 at the portion that abuts against the inclined portion 41a. Similar to the first embodiment, if the outer casing 5a is rotated relative to the friction ring 4a, the holding member 6a maintains contact with the friction ring 4a by the magnetic force of the magnetic body and moves along the inclined portion 41a. As this movement progresses, the holding member 6a approaches the settling portion 46a of the inclined portion 41a, and the embedding of the holding member 6a in the opening 51a is advanced.

[0083] Figure 15 It shows a cross-sectional view of the sheet winding shaft 1a in a state where the holding member 6a is completely embedded. In Figure 15 's state, the holding member 6a is completely embedded in the opening 51a, and the abutting portion 63a of the holding member 6a does not protrude from the outer peripheral surface of the outer casing 5a. In this state, the abutting portion 63a moves away from the core 10, and the fixing of the holding member 6a to the core 10 is released.

[0084] In the second embodiment, similar to the first embodiment, in order to restrict the movement of the abutting portion 63a of the holding member 6a in the direction of protruding from the outer peripheral surface of the outer casing 5a, the relative rotation of the friction ring 4a and the outer casing 5a is restricted. Therefore, in the winding portion 3a of the second embodiment, the rotation prevention unit 7 shown in Figure 2 and Figure 7 is also provided.

[0085] Figure 16This is a cross-sectional view near the rotation prevention unit 7 in the second embodiment, corresponding to that of the first embodiment. Figure 7 In this state, the clockwise rotation of the friction ring 4a (in the direction of arrow C) is restricted by the abutment of the abutment surface 48 of the engaging convex portion 47 against the convex portion 71 of the rotation prevention unit 7, and the counterclockwise rotation of the friction ring 4a (in the direction of arrow d) is restricted by the engagement of the protrusion 44a of the engaging convex portion 47 with the hooking portion 62a of the holding member 6a.

[0086] That is, the configuration of the second embodiment does not engage the convex portion 71 with the narrow groove 43 (refer to Figure 7 ), but similar to the first embodiment, the relative rotation of the friction ring 4a and the outer sleeve 5a can be restricted by the rotation prevention unit 7.

[0087] Regarding the operation of the rotation prevention unit 7 in the second embodiment, similar to the first embodiment, as described with reference to Figure 10 . In Figure 10 , in the first embodiment, since the rotational movement of the convex portion 71 is not restricted by either the narrow groove 43 or the groove 42, in the second embodiment where the narrow groove 43 and the groove 42 are not provided, the rotational movement of the convex portion 71 is the same as that in the first embodiment. In the second embodiment, as shown in Figure 13 , since the groove 49 is formed, as shown in Figure 10 (a), when the rotation prevention by the rotation prevention unit 7 is released, the rotation prevention unit 7 can move along the groove 49 integrally with the rotation of the outer sleeve 5a. By using the groove 49, it is also possible to restrict the deviation of the positional relationship in the axial length direction between the outer sleeve 5a and the friction ring 4a by the plunger 8.

[0088] The above describes the second embodiment. As described above, in the second embodiment, as shown in Figure 13 , a long and gentle inclined portion 41a is formed between two adjacent engaging convex portions 47. Therefore, in Figure 14 , the long and gentle inclined portion 41a extends between two adjacent holding members 6a. In this case, the circumferential length between the two holding members 6a is the same as the circumferential length between two adjacent holding members 6 in Figure 4 , but the length of the inclined portion 41a in Figure 14 is longer than the length of the inclined portion 41 in Figure 4 .

[0089] With this configuration, between the state where it sinks from the holding member 6a to the state where it protrudes from the holding member 6a, compared with the case where the sliding distance is short in Figure 15 to Figure 14 the state where the holding member 6a protrudes, in Figure 4Compared with the case where [description of the compared case], even if the rotational torque of each winding portion 3, 3a on the sheet winding shafts 1, 1a is the same, the force with which the holding member 6a holds the core 10 becomes larger. In this sheet winding shaft 1a, the holding member 6a maintains the protruding force by utilizing the rotational torque of the winding portion 3a on the sheet winding shaft 1a. When the winding diameter is small or when the rotational torque is small for winding at a low tension, the force for holding the core 10 also decreases. At this time, if the inclined portion 41a is gentle, it is easier to obtain the force required to hold the core 10 even with a low rotational torque. For the above reasons, the core 10 can be held more reliably.

[0090] In addition, in the first embodiment, in Figure 10 , the rotation prevention unit 7 can rotate without interfering with the walls of the groove 42 and the fine groove 43. However, as a prerequisite, during the assembly of each component, it is necessary to perform opposed alignment in advance so as not to cause interference. In the second embodiment, since the groove 42 and the fine groove 43 are not provided (refer to Figure 13 ), the burden of position alignment is reduced.

[0091] Furthermore, in the second embodiment, as shown in Figure 16 , an abutment surface 48 is formed on the engaging convex portion 47. The abutment surface 48 is the abutment surface of the convex portion 71 of the rotation prevention unit 7, but there is also a case where the holding member 6a abuts. Regarding this point, refer to Figure 17 for explanation. Figure 17 is a schematic view showing the state where the holding member 6a protrudes until it abuts against the abutment surface 48 of the engaging convex portion 47 near the holding member 6a in Figure 14 . For convenience, the holding member 6a is not shown in a sectional view but in a side view. In this abutting state, there is a slight gap between the convex portion 61a (flange) for preventing the holding member 6a from falling (detaching) and the outer casing 5a. In the case where the holding member 6a can protrude by more than a certain amount without this abutment surface 48, if the holding member 6a protrudes too much, the convex portion 61a of the holding member 6a touches the inner surface of the outer casing 5a, and the holding member 6a is clamped between the outer casing 5a and the friction ring 4a through the convex portion 61a, which may cause the holding member 6a to remain protruding and locked. Since the holding member 6a is not a roller, the possibility of such locking is very low, but by restricting the protrusion with the abutment surface 48, locking can be prevented more reliably.

[0092] In addition, as shown in Figure 17As shown, in a state where the protrusion of the holding member 6a is restricted by abutting against the inner surface of the core 10, it is difficult to set it to a state where the abutting surface 48 is in contact with the holding member 6a, and this state can mainly be achieved when the core 10 is not installed. When the abutting surface 48 is also in contact with the holding member 6a when the core 10 is installed, the holding member 6a may not be in sufficient contact with the inner circumferential surface of the core 10. When the abutting surface 48 is in contact with the holding member 6a, since the holding member 6a cannot protrude further, it is preferable to change the core 10 to a core with a slightly smaller inner diameter, so that the holding member 6a is in sufficient contact with the inner circumferential surface of the core 10 before the holding member 6a reaches its maximum protrusion. Therefore, when the core 10 is installed, it is preferable that the abutting surface 48 is not in contact with the holding member 6a.

[0093] The embodiments of the present invention have been described above, but these are only examples and can be appropriately changed. For example, Figure 8 The groove 42 shown is used to prevent interference with the rotation prevention unit 7 or the plunger 8, and the formation of the groove 42 is arbitrary. Figure 13 The groove 49 shown can be provided only on the engaging convex portion 47, or can be formed to extend from the engaging convex portion 47 to the inclined portion 41a along the axial circumferential direction of the friction ring 4a.

[0094] Description of Reference Numerals

[0095] 1, 1a Sheet winding shaft

[0096] 2 Base shaft

[0097] 3, 3a Winding portion

[0098] 4, 4a Friction ring

[0099] 5, 5a Outer casing

[0100] 6, 6a Holding member

[0101] 7 Rotation prevention unit

[0102] 8 Plunger

[0103] 10 Core

[0104] 21 Fluid passage

[0105] 22 Connecting hole

[0106] 23 Rotation torque adjustment unit

[0107] 41, 41a Inclined portion

[0108] 42 Groove

[0109] 43 Fine groove

[0110] 44, 44a Protrusion

[0111] 45, 45a raised portions

[0112] 46, 46a sunken portions

[0113] 47 engaging convex portions

[0114] 48 abutting surfaces

[0115] 51, 51a openings

[0116] 62, 62a hooking portions

[0117] 63, 63a abutting portions

[0118] 64 magnetic body

Claims

1. A sheet winding shaft for winding a sheet around a core, characterized in that, Comprising: A mandrel; A winding portion, arranged and externally fitted on the mandrel in plurality; A rotational torque adjusting unit for adjusting the rotational torque between the winding portion and the mandrel, The winding portion comprising: A friction ring having a plurality of inclined portions that undulate along the circumferential direction on the outer circumference; An outer casing that internally embeds the friction ring; A holding member that is embedded in the opening of the outer casing and moves along the inclined portion, and when located at the raised portion of the inclined portion, holds the core by protruding to the outside of the outer casing; A rotation prevention unit capable of restricting the relative rotation between the friction ring and the outer casing, The holding member comprising: A contact portion that contacts the inner circumference of the core; A hooking portion that engages with the friction ring when located at the sunken portion of the inclined portion.

2. The sheet winding shaft according to claim 1, wherein The holding member has a magnetic body at a portion that contacts the inclined portion of the friction ring.

3. The sheet winding shaft according to claim 1, wherein The outer casing is provided with a plunger that contacts the inner circumference of the core.

4. The sheet winding shaft according to any one of claims 1 to 3, wherein A fitting convex portion is formed on the outer circumferential surface of the friction ring, a protrusion that engages with the hooking portion of the holding member is formed on one end side of the fitting convex portion, and a contact surface that contacts the rotation prevention unit is formed on the other end side.

5. The sheet winding shaft according to any one of claims 1 to 3, wherein The friction ring is provided with a narrow groove that extends in the axial length direction, and is engaged with the rotation prevention unit through the narrow groove, and the relative rotation between the friction ring and the outer casing is restricted.

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