Cylindrical body mounting method and cylindrical body mounting device

Abstract

To simplify the work of mounting a cylindrical body made of an elastic material onto the outer circumferential surface of a columnar body, reduce buckling of the cylindrical body when mounting the cylindrical body to the outer circumferential surface of the columnar body, and enable mounting of the cylindrical body to the outer circumferential surface of the columnar body regardless of the sizes of the columnar body and cylindrical body.SOLUTION: A cylindrical body mounting method increases the distance between two pulleys on which a sleeve is hung, thereby applying an external force to the inner circumferential surface of the sleeve to elastically deform the sleeve so that the circumferential length of the inner circumferential surface becomes longer than the circumferential length of the outer circumferential surface of a roller (S102). The method then decreases the distance between the two pulleys to release the external force applied to the inner circumferential surface of the sleeve (S103). After that, the method inserts the roller into the sleeve (S105).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a cylindrical body mounting method and a cylindrical body mounting device for mounting a cylindrical body made of an elastic material on the outer peripheral surface of a pillar-shaped body. [Background technology]

[0002] For example, in a belt conveyor having a structure in which a conveyor belt is wound around the outer surfaces of multiple rollers, it is known to attach a sleeve made of an elastic material such as thermoplastic polyurethane to the outer surface of the roller in order to prevent the belt from meandering or shifting to one side, or to attach a cylindrical body made of an elastic material to the outer surface of a columnar body.

[0003] In Patent Document 1, to attach a sleeve as a cylindrical body to the outer peripheral surface of a support body as a columnar body, a mandrel is inserted into the sleeve, the diameter of which at one axial end is smaller than that of the support body and at the other axial end is approximately the same as that of the support body, and the diameter gradually increases from one axial end to the other axial end. A pressurized fluid such as compressed air is then introduced between the mandrel and the sleeve through a flow path formed in the mandrel to increase the diameter of the sleeve, while the sleeve is gradually moved to the other end of the mandrel. The sleeve is then attached to the outer peripheral surface of the support body by introducing a pressurized fluid between the mandrel and the sleeve, which has been moved to the other end of the mandrel, to increase the diameter of the sleeve, while moving the sleeve from the other end of the mandrel to a support body located on the other axial side of the mandrel.

[0004] In addition, in Patent Document 2, in order to attach a sleeve as a cylindrical body to the outer peripheral surface of a roller as a columnar body, the sleeve is attached to the inner peripheral surface of a holder of a cylindrical sleeve attachment jig, and then the roller is inserted into the sleeve attachment jig. When the roller reaches the holder, the diameter of the holder expands and the roller is inserted into the sleeve, thereby attaching the sleeve to the outer peripheral surface of the roller. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 50-110200 [Patent Document 2] Japanese Patent Publication No. 2022-25701 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, when attaching one sleeve to a support after attaching another sleeve to the support, the piping for supplying pressurized fluid must be removed and attached to insert the mandrel into the other sleeve, making the process of attaching the sleeve to the support complicated. Furthermore, depending on the rigidity of the sleeve, it may be difficult to increase the diameter of the sleeve by introducing pressurized fluid between the mandrel and the sleeve. Furthermore, in Patent Document 1, the diameter of the mandrel must be determined according to the diameters of the support and the sleeve. Therefore, different mandrel sizes are required when attaching a sleeve of a certain diameter to a support and when attaching a sleeve of a different diameter to a support.

[0007] On the other hand, in Patent Document 2, inserting the roller into the sleeve mounting jig raises the risk of the sleeve buckling when the roller is inserted into the sleeve. Furthermore, in the case of Patent Document 2, the internal diameter of the sleeve mounting jig must be set according to the diameters of the roller and sleeve. Therefore, different sizes of sleeve mounting jigs are required when mounting a sleeve of a certain diameter to a roller and when mounting a sleeve of a different diameter to a roller.

[0008] The object of the present invention is to provide a cylindrical body mounting method and a cylindrical body mounting device that simplifies the process of mounting a cylindrical body made of an elastic material to the outer peripheral surface of a pillar, makes the cylindrical body less likely to buckle when mounted on the outer peripheral surface of the pillar, and allows the cylindrical body to be mounted on the outer peripheral surface of a pillar regardless of the size of the pillar and the cylindrical body. [Means for solving the problem]

[0009] A cylindrical body mounting method according to a first aspect of the present invention is a cylindrical body mounting method for mounting a cylindrical body made of an elastic material to the outer peripheral surface of a pillar-shaped body, and includes an expansion step of elastically deforming the cylindrical body by applying an external force to the inner peripheral surface of the cylindrical body so that the circumferential length of the inner peripheral surface of the cylindrical body becomes longer than the circumferential length of the outer peripheral surface of the pillar-shaped body, a release step of releasing the application of the external force to the inner peripheral surface of the cylindrical body that has been elastically deformed so that the circumferential length of the inner peripheral surface becomes longer than the circumferential length of the outer peripheral surface of the pillar-shaped body, and a pillar-shaped body insertion step of inserting the pillar-shaped body into the cylindrical body after the release step.

[0010] In the present invention, an external force is applied to the inner peripheral surface of a cylindrical body, thereby elastically deforming the cylindrical body so that the circumferential length of the inner peripheral surface of the cylindrical body becomes longer than the circumferential length of the outer peripheral surface of a columnar body, and then the application of the external force to the inner peripheral surface of the cylindrical body is released, after which the columnar body is inserted into the cylindrical body. As a result, the columnar body is inserted into the cylindrical body that has been elastically deformed and is more elongated than before elastic deformation, and the cylindrical body can be easily attached to the outer peripheral surface of the columnar body.

[0011] Furthermore, in the present invention, as described above, the columnar body is inserted into a tubular body that has been elastically deformed and is more stretchable than before the elastic deformation. Therefore, even if the tubular body has low rigidity, for example, when the tubular body is thin, the tubular body will not buckle when the columnar body is inserted into the tubular body.

[0012] Furthermore, in the present invention, when an external force is applied to the inner peripheral surface of the cylindrical body to elastically deform the cylindrical body, it is not necessary to match the cross-sectional shape of the cylindrical body perpendicular to the axial direction to the cross-sectional shape of the cylindrical body perpendicular to the axial direction, for example, by making it cylindrical if the columnar body is cylindrical. As a result, for example, by varying the external force applied to the inner peripheral surface of the cylindrical body to vary the degree of elastic deformation of the cylindrical body, the cylindrical body can be elastically deformed according to its size, and the cylindrical body can be attached to columnar bodies of various sizes.

[0013] A tubular body mounting method according to a second aspect of the present invention is a tubular body mounting method according to the first aspect, wherein in the expansion step, a plurality of contact members are inserted into the tubular body, and at least one of the plurality of contact members is moved so as to increase the distance between at least two of the plurality of contact members, thereby applying an external force to the inner surface of the tubular body, and in the release step, the application of the external force to the inner surface of the tubular body is released by moving the at least one contact member so as to decrease the distance between the at least two contact members.

[0014] According to the present invention, by moving at least one of the multiple contact members that contact the inner surface of the cylindrical body, it is possible to easily apply an external force to the inner surface of the cylindrical body and release the application of the external force to the inner surface of the cylindrical body.

[0015] A tubular body mounting method according to a third aspect of the present invention is a tubular body mounting method according to the first aspect, wherein in the expansion step and the release step, the at least one contact member is moved by air pressure.

[0016] According to the present invention, the at least one contact member can be moved simply by using an air cylinder.

[0017] A cylindrical body mounting method according to a fourth aspect of the present invention is the cylindrical body mounting method according to any one of the first to third aspects, in which the expansion step and the release step are performed in a state in which the cylindrical body is positioned so that the axial direction of the cylindrical body is parallel to the axial direction of the pillar-shaped body and the pillar-shaped body and the cylindrical body are lined up adjacent to each other in the axial direction of the pillar-shaped body, and in the pillar-shaped body insertion step, the cylindrical body is inserted into the cylindrical body by moving the cylindrical body toward the pillar-shaped body in the axial direction of the pillar-shaped body.

[0018] According to the present invention, an external force is applied to the inner surface of the cylindrical body, causing the cylindrical body to elastically deform and increase the circumferential length of the inner surface, and after the application of the external force to the inner surface of the cylindrical body is released, the cylindrical body is moved in the axial direction of the cylindrical body toward the columnar body, thereby easily inserting the columnar body into the cylindrical body.

[0019] In the present invention, "the axial direction of the cylindrical body being parallel to the axial direction of the columnar body" does not necessarily mean that the axial direction of the cylindrical body and the axial direction of the columnar body are strictly parallel. The axial direction of the cylindrical body and the axial direction of the columnar body may be misaligned within a range that allows the columnar body to be inserted into the cylindrical body by moving the cylindrical body toward the columnar body in the axial direction of the columnar body.

[0020] A cylindrical body mounting device according to a fifth aspect of the present invention is a cylindrical body mounting device for mounting a cylindrical body made of an elastic material to the outer peripheral surface of a pillar-shaped body, and comprises: a plurality of contact members inserted into the cylindrical body; a moving mechanism that moves at least one of the plurality of contact members to change the distance between at least two of the plurality of contact members; and a control device. The control device performs an expansion process in which the control device controls the moving mechanism to move the at least one contact member to increase the distance between the at least two contact members, thereby applying an external force from the plurality of contact members inserted into the cylindrical body to the inner peripheral surface of the cylindrical body, thereby elastically deforming the cylindrical body so that the circumferential length of the inner peripheral surface of the cylindrical body becomes longer than the circumferential length of the outer peripheral surface of the pillar-shaped body; and a release process in which the control device controls the moving mechanism to move the at least one contact member to reduce the distance between the at least two contact members, thereby releasing the application of the external force from the plurality of contact members to the inner peripheral surface of the elastically deformed cylindrical body.

[0021] In the present invention, by applying an external force to the inner peripheral surface of the cylindrical body, the cylindrical body is elastically deformed so that the circumferential length of the inner peripheral surface of the cylindrical body becomes longer than the circumferential length of the outer peripheral surface of the columnar body, and then the application of the external force to the inner peripheral surface of the cylindrical body can be released. As a result, by inserting the columnar body into the cylindrical body that has been elastically deformed and is now more elongated than before the elastic deformation, the cylindrical body can be easily attached to the outer peripheral surface of the columnar body.

[0022] Furthermore, in the present invention, as described above, a columnar body can be inserted into a tubular body that has been elastically deformed and is more stretchable than before the elastic deformation. Therefore, even if the tubular body has low rigidity, for example, when the tubular body is thin, the tubular body will not buckle when the columnar body is inserted into it.

[0023] Furthermore, in the present invention, when an external force is applied to the inner peripheral surface of the cylindrical body to elastically deform the cylindrical body, it is not necessary to match the cross-sectional shape of the cylindrical body perpendicular to the axial direction to the cross-sectional shape of the cylindrical body perpendicular to the axial direction, for example, by making it cylindrical if the columnar body is cylindrical. As a result, for example, by applying different external forces to the inner peripheral surface of the cylindrical body to vary the degree of elastic deformation of the cylindrical body, the cylindrical body can be elastically deformed according to its size, and the cylindrical body mounting device can be used to mount cylindrical bodies to columnar bodies of various sizes.

[0024] A tubular body mounting device according to a sixth aspect of the present invention is a tubular body mounting device according to the fifth aspect, and is provided with a memory unit that stores the value of an expansion rate parameter indicating how much to extend the circumferential length of the inner surface of the tubular body, and the control device, during the expansion process, moves the at least one contact member by an amount corresponding to the value of the expansion rate parameter stored in the memory unit.

[0025] According to the present invention, by changing the value of the expansion rate parameter, the force applied to the inner surface of the cylindrical body is varied, and the degree of elastic deformation of the cylindrical body is varied, so that the cylindrical body can be elastically deformed according to its size, and the cylindrical body mounting device can be used to mount cylindrical bodies to pillars of various sizes.

[0026] A tubular body mounting device according to a seventh aspect of the present invention is a tubular body mounting device according to the fifth aspect, wherein the moving mechanism has an air cylinder as a driving source for moving the at least one contact member, and the control device controls the air cylinder.

[0027] According to the present invention, the at least one contact member can be moved simply by using an air cylinder.

[0028] A cylindrical body mounting device according to an eighth aspect of the present invention is a cylindrical body mounting device according to any one of the fifth to seventh aspects, and includes a pillar-shaped body arranging section in which the pillar-shaped body is arranged so that the axial direction of the pillar-shaped body and the axial direction of the pillar-shaped body into which the contact member is inserted are parallel, and the pillar-shaped body and the pillar-shaped body into which the contact member is inserted are lined up adjacent to each other in the axial direction of the pillar-shaped body.

[0029] According to the present invention, an external force is applied to the inner surface of the cylindrical body, causing the cylindrical body to elastically deform and increase the circumferential length of the inner surface, and after the application of the external force to the inner surface of the cylindrical body is released, the cylindrical body is moved in the axial direction of the cylindrical body toward the columnar body, thereby easily inserting the columnar body into the cylindrical body.

[0030] In the present invention, "the axial direction of the cylindrical body being parallel to the axial direction of the columnar body" does not necessarily mean that the axial direction of the cylindrical body and the axial direction of the columnar body are strictly parallel. The axial direction of the cylindrical body and the axial direction of the columnar body may be misaligned within a range that allows the columnar body to be inserted into the cylindrical body by moving the cylindrical body toward the columnar body in the axial direction of the columnar body. [Effects of the Invention]

[0031] In the present invention, a cylindrical body can be easily attached to the outer peripheral surface of a pillar. Furthermore, even if the rigidity of the pillar is low, the pillar will not buckle when inserted into the pillar. Furthermore, by varying the external force applied to the inner peripheral surface of the pillar to vary the degree of elastic deformation of the pillar, the pillar can be attached to pillars of various sizes. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a schematic configuration diagram of a cylindrical body mounting device according to a first embodiment, seen from above, with a handle portion raised. FIG. [Figure 2] 1 is a schematic configuration diagram of a cylindrical body mounting device according to a first embodiment, seen from above, with a handle portion lowered. FIG. [Figure 3] 1A is a cross-sectional view taken along line IIIA-IIIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIIB-IIIB in FIG. [Figure 4] 1. (a) is a cross-sectional view taken along line IVA-IVA in FIG. 1, and (b) is a cross-sectional view taken along line IVB-IVB in FIG. [Figure 5] 5 is a flowchart showing a procedure for attaching a sleeve to a roller using the cylindrical body attaching device of the first embodiment. [Figure 6] (a) is a diagram for explaining the circumferential length of the inner surface of the sleeve at each point in time when attaching the sleeve to the roller, (b) is a diagram of the roller with the sleeve attached viewed from the axial direction, and (c) is a diagram of the roller with the sleeve attached viewed from a direction perpendicular to the axial direction. [Figure 7] 10(a) is a schematic configuration diagram of a cylindrical body attachment device of a second embodiment, and FIG. 10(b) is a flowchart showing the processing flow of a control device when attaching a sleeve to a roller in the cylindrical body attachment device of the second embodiment. [Figure 8](a) is a diagram corresponding to Figure 7(a) in which the movable pulley is lowered to elastically deform the sleeve, (b) is a diagram corresponding to Figure 7(a) in which the movable pulley is raised to release the external force on the inner surface of the sleeve, and (c) is a diagram corresponding to Figure 7(a) in which a roller is attached to the sleeve. [Figure 9] FIG. 10 is a schematic configuration diagram of a cylindrical body mounting device according to a second embodiment, seen from above, with a handle portion lowered. [Figure 10] FIG. 10 is a cross-sectional view taken along line VB-VB in FIG. 9. [Figure 11] 10 is a graph showing the relationship between sleeve expansion time and attachment ease according to an embodiment. [Figure 12] 10 is a graph showing the relationship between sleeve expansion time and fastening force restorability according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0033] [First embodiment] A preferred first embodiment of the present invention will be described below. In the first embodiment, the left-right direction, the front-rear direction, and the up-down direction are defined as being orthogonal to one another, as shown in Figures 1, 2, 3(a), 3(b), 4(a), and 4(b).

[0034] <Overall configuration of cylindrical body mounting device> As shown in Figures 1, 2, 3(a), (b), 4(a), and (b), the cylindrical body mounting device 1 of the first embodiment includes a base plate 2, a sleeve extension portion 3, and a drive portion 4. To make the drawings easier to understand, in Figures 1 and 2, the upper surfaces of covers 12A and 12B (described later), the upper surfaces of fixed blocks 13A and 13B (described later), the upper surfaces of slide blocks 14A and 14B (described later), and the upper surface of a sleeve S (described later) are hatched.

[0035] <Base plate> The base plate 2 is a rectangular plate-like member made of a metal material or the like and extending in the left-right and front-rear directions.

[0036] <Sleeve extension part> The sleeve extension 3 is disposed on the upper surface of the front portion of the base plate 2. The sleeve extension 3 has a frame 11, two covers 12A and 12B, two fixing blocks 13A and 13B, and two sliding blocks 14A and 14B.

[0037] Frame 11 is a generally rectangular parallelepiped member made of metal or other material, with its longitudinal direction extending in the left-right direction, and is fixed to the upper surface of the front portion of base plate 2. Furthermore, frame 11 extends upward from the front-rear center in the portions forward of and rearward of the front-rear center. The upper portions of frame 11 forward of and rearward of the front-rear center are guide rail portions 11A and 11B, respectively, which extend in the left-right direction. Passages 21A and 21B, which are open at the front, rear, and top ends, are formed in the left-right centers of guide rail portions 11A and 11B, respectively, and passages 21A and 21B overlap in the front-rear direction.

[0038] Cover 12A is a rectangular plate-shaped member made of metal or the like, and is disposed on the upper surface of guide rail portion 11A, extending in the left-right direction over the entire length of guide rail portion 11A. As a result, the opening at the upper end of passage 21A is blocked by cover 12A. Cover 12B is a rectangular plate-shaped member made of metal or the like, and is disposed on the upper surface of guide rail portion 11B, and extends in the left-right direction over the entire length of guide rail portion 11B. As a result, the opening at the upper end of passage 21B is blocked by cover 12B.

[0039] Fixed block 13A is a generally rectangular parallelepiped member made of metal or other material with its longitudinal direction extending in the front-to-rear direction, and is fixed to the upper surface of the left end of frame 11 between guide rail portions 11A and 11B in the front-to-rear direction. Fixed block 13A is provided with a spring mounting pin 22A that protrudes to the right from the right end face of fixed block 13A. The left end of compression spring 24A is attached to spring mounting pin 22A.

[0040] Fixed block 13B is a generally rectangular parallelepiped member made of metal or other material with its longitudinal direction extending in the front-to-rear direction, and is fixed to the upper surface of the right end of frame 11 between guide rail portions 11A and 11B in the front-to-rear direction. Fixed block 13B is provided with a spring mounting pin 22B that protrudes leftward from the left end face of fixed block 13B. The right end of compression spring 24B is attached to spring mounting pin 22B.

[0041] The slide block 14A is made of a metal material or the like and is disposed on the upper surface of the frame 11 between the guide rail portions 11A and 11B in the front-rear direction and between the fixed blocks 13A and 13B in the left-right direction, with a gap left-right from the fixed block 13A. The slide block 14A is movable left-right along the rear end surface of the guide rail portion 11A and the front end surface of the guide rail portion 11B. The slide block 14A also has a spring mounting pin 23A that protrudes leftward from the left end surface of the slide block 14A. The right end of a compression spring 24A is attached to the spring mounting pin 23A. As a result, the slide block 14A is biased to the right by the compression spring 24A.

[0042] A pulley 25A (the "contact member" of the present invention) is provided on the upper surface of the right end of the slide block 14A. The pulley 25A is formed in a semi-cylindrical shape with an arc on the left side and protrudes upward from the upper surface of the slide block 14A. The right end surface of the upper portion of the slide block 14A and the right end surface of the pulley 25A form a plane that is parallel to the front-to-rear and up-down directions. The right end surface of the lower portion of the slide block 14A is located to the left of the right end surface of the upper portion of the slide block 14A and forms an inclined surface 26A that is inclined from left to right in the front-to-rear direction as it moves from rear to front.

[0043] The slide block 14B is made of a metal material or the like and is disposed on the upper surface of the frame 11 between the guide rail portions 11A and 11B in the front-rear direction and between the slide block 14A and the fixed block 13B in the left-right direction, with a gap left-right from the fixed block 13B. The slide block 14B is movable left-right along the rear end surface of the guide rail portion 11A and the front end surface of the guide rail portion 11B. The slide block 14B also has a spring mounting pin 23B that protrudes to the right from the right end surface of the slide block 14B. The left end of a compression spring 24B is attached to the spring mounting pin 23B. As a result, the slide block 14B is biased leftward by the compression spring 24B.

[0044] A pulley 25B (the "contact member" of the present invention) is provided on the upper surface of the left end of the slide block 14B. The pulley 25B is formed in a semi-cylindrical shape with an arc on the right side and protrudes upward from the upper surface of the slide block 14B. The left end surface of the upper portion of the slide block 14B and the left end surface of the pulley 25B form a plane that is parallel to the front-to-rear and up-down directions. The left end surface of the lower portion of the slide block 14B is located to the right of the left end surface of the upper portion of the slide block 14B and forms an inclined surface 26B that is inclined from right to left relative to the front-to-rear direction as it moves from rear to front.

[0045] <Drive unit> The driving unit 4 has a fixed part 31 fixed to the base plate 2 and a movable part 32 movable relative to the base plate 2.

[0046] The fixed portion 31 has a base portion 41, two frame portions 42A and 42B, and a cylindrical portion 43. The base portion 41 is made of a metal material or the like and is formed in the shape of a rectangular plate extending in the left-right and front-rear directions. The base portion 41 is fixed to the left-right center of the upper surface of the base plate 2, at a portion rearward of the sleeve extension portion 3.

[0047] The frame portions 42A and 42B are disposed approximately symmetrically in the left-right direction. More specifically, the front portions of the frame portions 42A and 42B are fixed to the center in the left-right direction of the upper surface of the base portion 41. The portion of the frame portion 42A fixed to the base portion 41 and the portion of the frame portion 42B fixed to the base portion 41 are disposed without any gap in the left-right direction. A tubular portion 43 is fixed to the upper surfaces of the front ends of the portions of the frame portions 42A and 42B fixed to the base portion 41. The tubular portion 43 is configured in a cylindrical shape with its axial direction extending in the front-to-rear direction, and has an internal space 43A with open front and rear ends.

[0048] Furthermore, the frame portions 42A and 42B extend rearward beyond the base portion 41. The portion of the frame portion 42A rearward beyond the base portion 41 is bent midway, and the portion including the rear end of the frame portion 42A is located to the left of the front end of the frame portion 42A. The portion of the frame portion 42B rearward beyond the base portion 41 is bent midway, and the portion including the rear end of the frame portion 42B is located to the right of the front end of the frame portion 42B. As a result, behind the base portion 41, the frame portions 42A and 42B are spaced apart in the left-right direction at the portions including their rear ends.

[0049] The movable portion 32 includes a tapered block 51, a slide shaft 52, a first arm 53, and a second arm .

[0050] The tapered block 51 is made of a metal material or the like, and at least a portion thereof is located between the inclined surface 26A of the slide block 14A and the inclined surface 26B of the slide block 14B in the left-right direction. The left end face of the tapered block 51 is parallel to the inclined surface 26A and has a tapered surface 61A that is in part in contact with the inclined surface 26A. The right end face of the tapered block 51 is parallel to the inclined surface 26B and has a tapered surface 61B that is in part in contact with the inclined surface 26B. As a result, the tapered block 51 is shorter in the left-right direction at its front portion.

[0051] The taper block 51 has a portion located rearward of the slide blocks 14A and 14B, and at least a part of this portion of the taper block 51 is located within the passage 21B provided in the guide rail portion 11B. As will be described later, when the taper block 51 is moved forward, the taper block 51 has a portion located forward of the slide blocks 14A and 14B, and this portion of the taper block 51 is located within the passage 21A provided in the guide rail portion 11A. The rear end of the taper block 51 is provided with a pin mounting portion 56 to which a mounting pin 62, which will be described later, is attached.

[0052] The slide shaft 52 is a cylindrical member made of a metal material or the like, with its axis extending in the front-rear direction. The slide shaft 52 is inserted into the internal space 43A of the cylindrical portion 43 and is movable in the front-rear direction along the inner wall surface of the internal space 43A. A mounting pin 62 is fixed to the front end of the slide shaft 52. The mounting pin 62 extends forward of the slide shaft 52, and its front end is attached to a pin mounting portion 56. This allows the taper block 51 and the slide shaft 52 to move together in the front-rear direction. The mounting pin 62 is a thread extending in the front-rear direction. By rotating the mounting pin 62 forward or backward, the distance between the taper block 51 and the slide shaft 52 in the front-rear direction can be adjusted. This allows the position of the taper block 51 in the front-rear direction to be adjusted when the taper block 51 is moved in the front-rear direction, as described below. A connecting portion 52A is provided at the rear end of the slide shaft 52 for connection to the first arm 53.

[0053] The first arm 53 is composed of two arm members 53A and 53B made of a metal material or the like. The arm members 53A and 53B are arranged substantially symmetrically in the left-right direction. More specifically, the arm members 53A and 53B are arranged with a gap between them in the left-right direction at their front ends. A connection portion 52A of the slide shaft 52 is arranged between the front end of the arm member 53A and the front end of the arm member 53B in the left-right direction. The first arm 53 and the connection portion 52A are connected by a swing shaft 63 that penetrates the arm members 53A and 53B and the connection portion 52A in the left-right direction, and the first arm 53 can swing around the swing shaft 63.

[0054] Arm member 53A is bent midway, with the portion including the rear end being located to the right of the front portion. Arm member 53B is bent midway, with the portion including the rear end being located to the left of the front portion. As a result, the portion including the rear end of arm member 53A and the portion including the rear end of arm member 53B are aligned side by side with no gap in the left-right direction.

[0055] The second arm 54 is composed of two arm members 54A and 54B made of a metal material or the like. The arm members 54A and 54B are arranged substantially symmetrically in the left-right direction. More specifically, the front portion of the arm member 54A and the front portion of the arm member 54B are arranged with a gap in the left-right direction. The rear ends of the arm members 53A and 53B are arranged between the front end of the arm member 54A and the front end of the arm member 54B in the left-right direction. The first arm 53 and the second arm 54 are connected by a swing shaft 64 that passes through the rear ends of the arm members 53A and 53B and the front ends of the arm members 54A and 54B in the left-right direction, and the first arm 53 and the second arm 54 can swing around the swing shaft 64.

[0056] In addition, the second arm 54 and the above-mentioned frame portions 42A, 42B are connected by a swing shaft 65 that penetrates approximately the center of the length of the arm members 54A, 54B and the rear end portions of the frame portions 42A, 42B in the left-right direction, and the second arm 54 can swing around the swing shaft 65.

[0057] Arm member 54A is bent midway, with the portion including its rear end positioned to the right of its front portion. Arm member 54B is bent midway, with the portion including its rear end positioned to the left of its front portion. As a result, the portion including the rear end of arm member 54A and the portion including the rear end of arm member 54B are arranged with no gap in the left-right direction. Handles 55 for operation by the operator are attached to the rear ends of arm members 54A and 54B of second arm 54.

[0058] When the operator lifts the handle 55, as shown in FIGS. 1, 3(a), and 4(a), the second arm 54 swings about the swing shaft 65, causing the swing shaft 64 to move rearward and downward. Accordingly, the first arm 53 swings, causing the swing shaft 63 to move rearward. This causes the slide shaft 52 and the tapered block 51 to move rearward, and the more forward portions of the tapered surfaces 61A and 61B, i.e., the portions of the tapered block 51 that are shorter in the left-right direction, come into contact with the inclined surfaces 26A and 26B of the slide blocks 14A and 14B. As a result, the slide block 14A biased by the compression spring 24A moves rightward, and the slide block 14B biased by the compression spring 24B moves leftward. This causes the slide blocks 14A and 14B to approach each other in the left-right direction, reducing the distance between the pulleys 25A and 25B.

[0059] On the other hand, when the operator lowers the handle portion 55, as shown in FIGS. 2, 3(b), and 4(b), the second arm 54 swings about the swing shaft 65, moving the swing shaft 64 upward and forward. Accordingly, the first arm 53 swings, moving the swing shaft 63 forward. This causes the slide shaft 52 and the tapered block 51 to move forward, and the rearward portions of the tapered surfaces 61A and 61B, i.e., the longer portions of the tapered block 51 in the left-right direction, come into contact with the inclined surfaces 26A and 26B of the slide blocks 14A and 14B. As a result, the slide block 14A moves leftward against the biasing force of the compression spring 24A, and the slide block 14B moves rightward against the biasing force of the compression spring 24B. This causes the slide blocks 14A and 14B to move apart in the left-right direction, increasing the distance between the pulleys 25A and 25B.

[0060] <How to attach the sleeve to the roller> Next, a method for attaching a sleeve S as a cylindrical body made of an elastic material such as rubber to a columnar roller R as a pillar-like body using the cylindrical body attachment device 1 will be described. In the first embodiment, the sleeve S is attached to the roller R using the cylindrical body attachment device 1 according to the procedure shown in the flowchart of FIG.

[0061] More specifically, when attaching the sleeve S to the roller R using the cylindrical body attaching device 1, first, the handle portion 55 is raised, and the sleeve S is attached to the pulleys 25A and 25B so that the sleeve S is hung across the pulleys 25A and 25B with the distance between the pulleys 25A and 25B reduced as shown in Figures 1, 3(a), and 4(a) (S101). In this state, as shown in Figure 6(a), the circumferential length of the inner peripheral surface of the sleeve S is length L1, which is less than the circumferential length Lr of the outer peripheral surface Ra of the roller R.

[0062] Next, the handle portion 55 is lowered to increase the distance between the pulley 25A and the pulley 25B as shown in Figures 2, 3(b), and 4(b), thereby applying an external force to the inner circumferential surface Sa of the sleeve S attached to the pulleys 25A and 25B, thereby elastically deforming the sleeve S (S102, the "expansion step" of the present invention). At this time, as shown in Figure 6(a), the sleeve S is elastically deformed so that the circumferential length of the inner circumferential surface Sa of the sleeve S after elastic deformation becomes L2, which is longer than the circumferential length Lr of the outer circumferential surface Ra of the roller R.

[0063] In the first embodiment, for example, before attaching the sleeve S to the pulleys 25A, 25B or immediately after attaching the sleeve S to the pulleys 25A, 25B, or before lowering the handle portion 55, the mounting pin 62 is rotated forward or backward in the state shown in FIGS. 1, 3(a), and 4(a) to adjust the front-to-rear distance between the taper block 51 and the slide shaft 52. At this time, the larger the size of the sleeve S, the longer the front-to-rear distance between the taper block 51 and the slide shaft 52. The longer the front-to-rear distance between the taper block 51 and the slide shaft 52, the greater the degree of elastic deformation of the sleeve S.

[0064] Next, the handle portion 55 is raised to reduce the distance between the pulley 25A and the pulley 25B as shown in Figures 1, 3(a) and 4(a), thereby releasing the application of external force from the pulleys 25A and 25B to the inner surface Sa of the sleeve S (S103, the "release step" of the present invention).

[0065] Next, the elastically deformed sleeve S is removed from the pulleys 25A and 25B (S104), and as shown in Figures 6(b) and (c), the roller R is inserted into the elastically deformed sleeve S, thereby attaching the sleeve S to the outer surface Ra of the roller R (S105, the "columnar body insertion step" of the present invention).

[0066] Here, after the application of external force from pulleys 25A and 25B is released in S103, sleeve S gradually shrinks, and the circumferential length of inner peripheral surface Sa gradually decreases, but sleeve S becomes more extensible than before elastic deformation. Then, in S103, roller R is inserted into sleeve S, which has become more extensible after elastic deformation, so that sleeve S is attached to outer peripheral surface Ra of roller R.

[0067] <Effects> In the first embodiment, an external force is applied to the inner circumferential surface Sa of the sleeve S to elastically deform the sleeve S, thereby making the circumferential length of the inner circumferential surface Sa of the sleeve S longer than the circumferential length Lr of the outer circumferential surface Ra of the roller R, and then the application of the external force to the inner circumferential surface Sa of the sleeve S is released. Thereafter, the roller R is inserted into the sleeve S, and the sleeve S is attached to the outer circumferential surface Ra of the roller R. As a result, the roller R is inserted into the sleeve S, which has been elastically deformed and is now more stretchable than before the elastic deformation, and the sleeve S can be easily attached to the outer circumferential surface Ra of the roller R.

[0068] Furthermore, in the first embodiment, as described above, the roller R is inserted into the sleeve S that has been elastically deformed and is now more stretchable than before the elastic deformation. Therefore, even if the sleeve S has low rigidity, for example, when the sleeve S is thin, the sleeve S will not buckle when the roller R is inserted into the sleeve S.

[0069] Furthermore, unlike the first embodiment, when applying an external force to the sleeve S to elastically deform the sleeve S while inserting the sleeve S into the roller R, the cross-sectional shape of the sleeve S perpendicular to the axial direction must be adjusted to match the cross-sectional shape of the roller R perpendicular to the axial direction, for example by making it cylindrical.

[0070] In contrast, in the first embodiment, an external force is applied to the inner circumferential surface Sa of the sleeve S to elastically deform the sleeve S so that the circumferential length of the inner circumferential surface Sa of the sleeve S is longer than the circumferential length Lr of the outer circumferential surface Ra of the roller R. After that, the application of the external force to the inner circumferential surface Sa of the sleeve S is released, and the roller R is inserted into the sleeve S. Therefore, when applying an external force to the inner circumferential surface Sa of the sleeve S to elastically deform the sleeve S, it is not necessary to match the cross-sectional shape of the sleeve S perpendicular to the axial direction with the cross-sectional shape of the roller R perpendicular to the axial direction, for example, by making it cylindrical. For example, in the first embodiment, as shown in FIG. 2 , the cross-sectional shape of the roller R perpendicular to the axial direction is circular, whereas the sleeve S is substantially elliptical when elastically deformed by applying an external force to the inner circumferential surface Sa. As a result, by varying the external force applied to the inner circumferential surface Sa of the sleeve S to vary the degree of elastic deformation of the sleeve S, the sleeve S can be attached to rollers R of various sizes using the same cylindrical-body attachment device 1.

[0071] Furthermore, in the first embodiment, by increasing the distance between the pulley 25A and the pulley 25B that contact the inner circumferential surface Sa of the sleeve S, an external force can be easily applied to the inner circumferential surface Sa of the sleeve S. Furthermore, by subsequently decreasing the distance between the pulley 25A and the pulley 25B, the application of the external force to the inner circumferential surface Sa of the sleeve S can be easily released.

[0072] [Second embodiment] Next, a second preferred embodiment of the present invention will be described. In the second embodiment, the left-right direction and the up-down direction are defined as shown in Fig. 7(a), and the direction perpendicular to the paper surface of Fig. 7(a) is defined as the front-rear direction.

[0073] <Overall configuration of cylindrical body mounting device> As shown in Figure 7(a), the cylindrical body mounting device 101 of the second embodiment includes a base plate 102, a pulley support member 103, a fixed pulley 104, a movable pulley 105, an air cylinder 106 (the "moving mechanism" of the present invention), a roller arrangement section 107 (the "columnar body arrangement section" of the present invention), and a control device 108.

[0074] The base plate 102 is a plate-like member made of a metal material or the like, extending in the left-right and front-rear directions. The pulley support member 103 is made of a metal material or the like, and is disposed on the upper surface of the right end portion of the base plate 102, extending upward from the upper surface of the base plate 102.

[0075] The fixed pulley 104 is fixed to the left end surface of the upper end of the pulley support member 103, and extends to the left from the left end surface of the pulley support member 103. The fixed pulley 104 has, for example, a substantially semi-cylindrical shape with an arc-shaped upper side. The movable pulley 105 is attached to a portion of the left end surface of the pulley support member 103 below the fixed pulley 104, and extends to the left from the pulley support member 103. The movable pulley 105 has, for example, a substantially semi-cylindrical shape with an arc-shaped lower side. A guide rail 103A extending in the vertical direction is formed on the left end surface of the pulley support member 103, and the movable pulley 105 is movable in the vertical direction along the guide rail 103A.

[0076] In the second embodiment, the sleeve S can be attached to the fixed pulley 104 and the movable pulley 105 by hanging the sleeve S between the fixed pulley 104 and the movable pulley 105. The axial direction of the sleeve S attached to the fixed pulley 104 and the movable pulley 105 is parallel to the left-right direction.

[0077] The air cylinder 106 has a main body 111 and a cylinder shaft 112. The main body 111 is disposed below the base plate 102. The cylinder shaft 112 extends in the vertical direction, with a lower portion located within the main body 111 and an upper portion located above the main body 111. A through-hole 102A that passes through the base plate 102 in the vertical direction is formed in the base plate 102 at a portion that vertically overlaps with the right end of the movable pulley 105. The portion of the cylinder shaft 112 that is located above the main body 111 passes through the through-hole 102A and extends above the base plate 102, and the upper end of the cylinder shaft 112 is connected to the movable pulley 105.

[0078] By driving the air cylinder 106, the cylinder shaft 112 can be moved up and down by the force of air. When the cylinder shaft 112 is moved up and down, the movable pulley 105 connected to the cylinder shaft 112 moves up and down along the guide rail 103A. Note that Fig. 7(a) shows a state in which the movable pulley 105 has been moved to the uppermost position.

[0079] The roller arrangement section 107 is provided on the upper surface of the base plate 102 to the left of the fixed pulley 104 and the movable pulley 105. The roller arrangement section 107 is a section where rollers R to which sleeves S are attached are arranged. The rollers R are arranged in the roller arrangement section 107 so that their axial directions are parallel to the axial direction of the sleeves S attached to the fixed pulley 104 and the movable pulley 105, i.e., parallel to the left-right direction. The rollers R arranged in the roller arrangement section 107 are aligned adjacent to the sleeves S in the left-right direction, to the left of the sleeves S attached to the fixed pulley 104 and the movable pulley 105. The axial directions of the rollers R arranged in the roller arrangement section 107 and the axial directions of the sleeves S attached to the fixed pulley 104 and the movable pulley 105 may be misaligned to the extent that, when inserting the rollers R into the sleeves S, the sleeves S can be inserted by moving the sleeves S to the left toward the rollers R, as described below.

[0080] The control device 108 is connected to the air cylinder 106 and controls the operation of the air cylinder 106. The control device 108 also has a storage unit 109. The storage unit 109 stores a program for causing the control device 108 to perform processing, a sleeve expansion rate parameter value, and the like. The sleeve expansion rate parameter is a parameter that indicates the degree to which the sleeve S is to be elastically deformed when the sleeve S is elastically deformed, as will be described later. In the second embodiment, for example, an operator can set the value of the sleeve expansion rate parameter stored in the storage unit 109 by performing a predetermined operation on an operation unit (not shown) provided in the control device 108 or a PC (not shown) connected to the control device 108. Note that the control device 108 is not limited to having the storage unit 109, and the storage unit 109 may be provided outside the control device 108.

[0081] <Method of attaching sleeve to roller and processing by control device> Next, a method for attaching the sleeve S to the roller R using the cylindrical body attaching device 101 will be described.

[0082] When attaching a sleeve S to a roller R using the cylindrical body attachment device 101, as shown in Fig. 7(a), with the movable pulley 105 positioned at the uppermost position by the air cylinder 106, an operator attaches the sleeve S to the fixed pulley 104 and the movable pulley 105, places the roller R in the roller placement unit 107, and then transmits an instruction signal to the control device 108 to instruct the start of processing for attaching the sleeve S. The instruction signal is transmitted to the control device 108 by, for example, operating an operation unit (not shown) provided in the control device 108 or a PC (not shown) connected to the control device 108.

[0083] When the control device 108 receives the instruction signal, it performs processing according to the flowchart of Fig. 7(b). More specifically, the control device 108 reads the value of the expansion rate parameter stored in the storage unit 109 (S201).

[0084] Next, the control device 108 executes an expansion process (S202). In the expansion process of S202, as shown in FIG. 8(a), the control device 108 controls the air cylinder 106 to move the cylinder shaft 112 downward, thereby moving the movable pulley 105 downward by an amount corresponding to the value of the expansion rate parameter read in S201, thereby increasing the distance between the fixed pulley 104 and the movable pulley 105. As a result, the sleeve S attached to the fixed pulley 104 and the movable pulley 105 is elastically deformed by the application of external forces to the inner circumferential surface Sa from the fixed pulley 104 and the movable pulley 105. As a result, the circumferential length of the inner circumferential surface Sa of the sleeve S increases. Furthermore, the greater the movable pulley 105 is lowered, the greater the elastic deformation of the sleeve S, and the longer the circumferential length of the inner circumferential surface Sa of the sleeve S increases. Here, the value of the expansion rate parameter is set to a value such that the circumferential length of the inner circumferential surface Sa of the sleeve S after elastic deformation is longer than the circumferential length Lr of the outer circumferential surface Ra of the roller R to which the sleeve S is attached. Note that in the second embodiment, the step of applying an external force from the fixed pulley 104 and the movable pulley 105 to the inner circumferential surface Sa of the sleeve S by executing the expansion process of S202 corresponds to the "expansion step" of the present invention.

[0085] Next, the control device 108 executes a release process (S203). In the release process of S203, as shown in FIG. 8(b), the control device 108 controls the air cylinder 106 to move the cylinder shaft 112 upward, thereby moving the movable pulley 105 upward and reducing the distance between the fixed pulley 104 and the movable pulley 105. The position of the movable pulley 105 in FIG. 8(b) is substantially the same as the position of the movable pulley 105 in FIG. 7(a). This releases the application of the external force from the fixed pulley 104 and the movable pulley 105 to the inner circumferential surface Sa of the sleeve S. Note that in the second embodiment, the step of executing the release process of S203 to release the application of the external force from the fixed pulley 104 and the movable pulley 105 to the inner circumferential surface Sa of the sleeve S corresponds to the "release step" of the present invention.

[0086] 8(c), the worker removes the elastically deformed sleeve S from the fixed pulley 104 and the movable pulley 105, and moves the elastically deformed sleeve S to the left toward the roller R arranged in the roller arrangement section 107, thereby inserting the roller R into the elastically deformed sleeve S and attaching the sleeve S to the outer peripheral surface Ra of the roller R. Note that in the second embodiment, the step of removing the elastically deformed sleeve S from the fixed pulley 104 and the movable pulley 105 and inserting the roller R arranged in the roller arrangement section 107 into the elastically deformed sleeve S corresponds to the "columnar body insertion step" of the present invention.

[0087] <Effects> In the second embodiment, similar to the first embodiment, the sleeve S can be easily attached to the outer peripheral surface Ra of the roller R. Also, in the second embodiment, similar to the first embodiment, even if the rigidity of the sleeve S is low, the sleeve S does not buckle when inserting the roller R into the sleeve. Also, in the second embodiment, similar to the first embodiment, the sleeve S can be attached to rollers R of various sizes using the same cylindrical body attachment device 101.

[0088] Furthermore, in the second embodiment, by moving the movable pulley 105 downward to increase the distance between the fixed pulley 104 and the movable pulley 105, which are in contact with the inner peripheral surface Sa of the sleeve S, it is possible to easily apply an external force to the inner peripheral surface Sa of the sleeve S. Furthermore, by subsequently moving the movable pulley 105 upward to decrease the distance between the fixed pulley 104 and the movable pulley 105, it is possible to easily release the application of the external force to the inner peripheral surface Sa of the sleeve S.

[0089] In the second embodiment, the movable pulley 105 can be easily moved by using the air force of the air cylinder 106.

[0090] Furthermore, in the second embodiment, the axial direction of the rollers R arranged in the roller arrangement section 107 is parallel to the axial direction of the sleeve S attached to the fixed pulley 104 and the movable pulley 105, and the rollers R arranged in the roller arrangement section 107 and the sleeve S attached to the fixed pulley 104 and the movable pulley 105 are lined up adjacent to each other in the axial direction. Therefore, after the application of an external force to the inner circumferential surface Sa of the sleeve S by the fixed pulley 104 and the movable pulley 105 is released, the elastically deformed sleeve S can be moved toward the rollers R, thereby easily inserting the rollers R into the sleeve S.

[0091] Furthermore, in the second embodiment, by varying the amount by which the movable pulley 105 is moved downward according to the value of the expansion rate parameter, it is possible to vary the magnitude of the external force applied to the inner circumferential surface Sa of the sleeve S and thereby vary the degree of elastic deformation of the sleeve S. This makes it possible to attach sleeves S to rollers R of various sizes using the same cylindrical body attaching device 101.

[0092] [Third embodiment] A third preferred embodiment of the present invention will now be described. In the third embodiment, the left-right direction, the front-rear direction, and the up-down direction will also be defined as being orthogonal to one another, as shown in Figures 9 and 10.

[0093] <Overall configuration of cylindrical body mounting device> As shown in FIGS. 9 and 10, a cylindrical body mounting device 201 of the third embodiment includes a base plate 202, a sleeve extension portion 203, a drive portion 204, and lift-up prevention rails 209A and 209B.

[0094] <Base plate 202> The base plate 202 is a rectangular plate-like member made of a metal material or the like and extending in the left-right and front-rear directions. The front side of the base plate 202 is provided with a grip portion 202A that is U-shaped when viewed from above and inclined upward from the front side of the base plate 202 when viewed from the left side. The upper surface of the rear end of the base plate 202 is provided with a U-shaped grip portion 202B. In Figs. 9 and 10, the grip portion 202B is indicated by a dashed line to make the drawings easier to read.

[0095] <Sleeve extension part 203> The sleeve extension part 203 is disposed on the upper surface of the front part of the base plate 202. The sleeve extension part 203 has a frame 211, a guide part 212, a fixed block 213, two guide rails 214A and 214B, two compression springs 215A and 215B, and a slide block 216.

[0096] The frame 211 is a member made of a metal material or the like, and has a substantially rectangular parallelepiped shape with the left-right direction as the longitudinal direction.

[0097] The guide portion 212 is a member made of a metal material or the like, and has the same dimensions as the frame 211 in the left-right and front-rear directions. A pulley 225A (the "contact member" of the present invention) is provided on the upper surface of the center of the front end of guide portion 212. Pulley 225A is formed in a semi-cylindrical shape with an arc on the rear side, and protrudes upward from the upper surface of guide portion 212. The front side surfaces of guide portion 212 and pulley 225A form a single plane that is parallel to the left-right and up-down directions. A passage 212A having open front and rear ends is formed in the center in the left-right direction of the guide portion 212. A slide rod 251, which will be described later, slides in the passage 212A of the guide portion 212.

[0098] The fixed block 213 is a substantially rectangular parallelepiped member made of a metal material or the like, with the longitudinal direction extending in the left-right direction, and is fixed to the upper surface of the front end portion of the base plate 202 .

[0099] The guide rail 214A is a cylindrical member whose axial direction is the front-rear direction and is fixed between the left side surface of the front side surface of the guide part 212 and the left side surface of the rear side surface of the fixed block 213. The guide rail 214B is also a cylindrical member with its axial direction aligned in the front-rear direction. The guide rail 214B is fixed between the right side surface of the front side surface of the guide part 212 and the right side surface of the rear side surface of the fixed block 213.

[0100] The compression springs 215A and 215B are metal coil springs. The compression spring 215A is inserted into the guide rail 214A so as to be able to expand and contract between the left side surface of the front side of the slide block 216 and the left side surface of the rear side of the fixed block 213. The compression spring 215B is inserted into the guide rail 214B so as to be able to expand and contract between the right side surface of the front side of the slide block 216 and the right side surface of the rear side of the fixed block 213.

[0101] The slide block 216 is made of a metal material or the like, and has a passage 216A that is open at the front and rear ends formed on the left side in the left-right direction, and a passage 216B that is open at the front and rear ends formed on the right side in the left-right direction. The guide rails 214A and 214B are inserted into the passages 216A and 216B of the slide block 216, respectively. Slide block 216 is slidable along guide rails 214A and 214B between the front side surface of guide portion 212 and the rear side surface of fixed block 213. In addition, slide block 216 is biased rearward by compression spring 215A inserted into guide rail 214A and compression spring 215B inserted into guide rail 214B.

[0102] A pulley 225B (the "contact member" of the present invention) is provided on the upper surface of the center of the rear end of the slide block 216. The pulley 225B is formed in a semi-cylindrical shape with an arc on the front side, and protrudes upward from the upper surface of the slide block 216. The rear side of the pulley 225B is provided slightly forward of the rear side of the slide block 216.

[0103] <Drive unit 204> The driving unit 204 has a fixed unit 231 fixed to the base plate 202 and a movable unit 232 movable relative to the base plate 202 .

[0104] The fixed portion 231 has a base portion 241, two frame portions 242A and 242B, and a cylindrical portion 243. The base portion 241 is made of a metal material or the like and is formed in the shape of a rectangular plate extending in the left-right and front-rear directions. The base portion 241 is fixed to a portion of the upper surface of the base plate 202, in the left-right center, rearward of the sleeve extension portion 203.

[0105] The frame portions 242A and 242B are disposed approximately symmetrically in the left-right direction. Explaining in detail, the front portions of the frame portions 242A and 242B are fixed to the center in the left-right direction of the upper surface of the base portion 241. The portion of the frame portion 242A fixed to the base portion 241 and the portion of the frame portion 242B fixed to the base portion 241 are disposed without any gap in the left-right direction. A tubular portion 243 is fixed to the upper surfaces of the front ends of the portions of the frame portions 242A and 242B fixed to the base portion 241. The tubular portion 243 is configured in a cylindrical shape with its axial direction extending in the front-rear direction, and has an internal space 243A that is open at the front and rear ends.

[0106] Furthermore, frame portions 242A and 242B extend rearward beyond base portion 241. The portion of frame portion 242A rearward beyond base portion 241 is bent midway, and the portion including the rear end of frame portion 242A is located to the left of the front end of frame portion 242A. The portion of frame portion 242B rearward beyond base portion 241 is bent midway, and the portion including the rear end of frame portion 242B is located to the right of the front end of frame portion 242B. As a result, behind base portion 241, frame portions 242A and 242B are arranged with a gap between them in the left-right direction at the portions including their rear ends.

[0107] The movable portion 232 has a slide rod 251 , a slide shaft 252 , a first arm 253 , and a second arm 254 .

[0108] The slide bar 251 is a cylindrical member made of a metal material or the like, with its axial direction extending in the front-rear direction. The slide bar 251 is inserted into a passage 212A of the guide part 212 and is slidable in the front-rear direction along the inner wall surface of the passage 212A. In addition, when the slide bar 251 is moved forward as described below, the slide bar 251 has a portion that is located forward of the guide part 212, and the front surface of this portion abuts against the center in the left-right direction of the rear surface of the slide block 216. In addition, a pin attachment part 256 to which an attachment pin 262, described below, is attached, is provided at the rear end of the slide bar 251.

[0109] The slide shaft 252 is a cylindrical member made of a metal material or the like, with its axis extending in the front-rear direction. The slide shaft 252 is inserted into the internal space 243A of the cylindrical portion 243 and is slidable in the front-rear direction along the inner wall surface of the internal space 243A. A mounting pin 262 is fixed to the front end of the slide shaft 252. The mounting pin 262 extends forward of the slide shaft 252, and the front end of the mounting pin 262 is attached to the pin mounting portion 256. This allows the slide bar 251 and the slide shaft 252 to move together in the front-rear direction. The mounting pin 262 is also threaded along the front-rear direction, and the distance between the slide bar 251 and the slide shaft 252 in the front-rear direction can be adjusted by rotating the mounting pin 262 forward or backward. This allows the front-rear position of the slide bar 251 to be adjusted when the slide bar 251 is moved in the front-rear direction, as described below. Furthermore, a connecting portion 252A for connecting to the first arm 253 is provided at the rear end of the slide shaft 252.

[0110] The first arm 253 is composed of two arm members 253A and 253B made of a metal material or the like. The arm members 253A and 253B are arranged substantially symmetrically in the left-right direction. More specifically, the arm members 253A and 253B are arranged with a gap between them in the left-right direction at their front ends. A connection portion 252A of the slide shaft 252 is arranged between the front end of the arm member 253A and the front end of the arm member 253B in the left-right direction. The first arm 253 and the connection portion 252A are connected by a swing shaft 263 that penetrates the arm members 253A and 253B and the connection portion 252A in the left-right direction, and the first arm 253 can swing around the swing shaft 263.

[0111] Arm member 253A is bent midway, with the portion including the rear end being located to the right of the front portion. Arm member 253B is bent midway, with the portion including the rear end being located to the left of the front portion. As a result, the portion including the rear end of arm member 253A and the portion including the rear end of arm member 253B are aligned side by side with no gap in the left-right direction.

[0112] The second arm 254 is composed of two arm members 254A and 254B made of a metal material or the like. The arm members 254A and 254B are arranged substantially symmetrically in the left-right direction. More specifically, the front portion of the arm member 254A and the front portion of the arm member 254B are arranged with a gap in the left-right direction. The rear ends of the arm members 253A and 253B are arranged between the front end of the arm member 254A and the front end of the arm member 254B in the left-right direction. The first arm 253 and the second arm 254 are connected by a swing shaft 264 that penetrates the rear ends of the arm members 253A and 253B and the front ends of the arm members 254A and 254B in the left-right direction, and the first arm 253 and the second arm 254 can swing around the swing shaft 264.

[0113] In addition, the second arm 254 and the above-mentioned frame portions 242A, 242B are connected by a swing shaft 265 that passes through approximately the center of the length of the arm members 254A, 254B and the rear end portions of the frame portions 242A, 242B in the left-right direction, and the second arm 254 can swing around the swing shaft 265.

[0114] Arm member 254A is bent midway, with the portion including its rear end being located to the right of its front portion. Arm member 254B is bent midway, with the portion including its rear end being located to the left of its front portion. As a result, the portion including the rear end of arm member 254A and the portion including the rear end of arm member 254B are arranged without any gap in the left-right direction. Handle portion 255 for operation by the operator is attached to the rear ends of arm members 254A and 254B of second arm 254.

[0115] Handle portion 255 is a columnar member made of metal or the like, and has a front end portion 255A into which the rear ends of arm members 254A and 254B of second arm 254 are inserted and fixed, and a rear end portion 255B that is bent upward at a predetermined angle relative to front end portion 255A. This ensures a space for fingers between rear end portion 255B and the desk or the like when handle portion 255 is pressed down, preventing fingers from getting pinched between rear end portion 255B of handle portion 255 and the desk or the like. Here, the predetermined angle, i.e., the angle between the central axis of front end 255A and the central axis of rear end 255B, is preferably 10° to 30°. If the angle between front end 255A and rear end 255B is less than 10°, when handle portion 255 is pushed down, there is insufficient space for fingers between rear end 255B and a desk or the like, and there is a risk that fingers will be pinched between rear end 255B of handle portion 255 and a desk or the like. On the other hand, if the angle between front end 255A and rear end 255B is greater than 30°, the position of rear end 255B of handle portion 255 will be too high, which may reduce operability of the pushing down operation, etc.

[0116] When the operator lifts the handle portion 255, the second arm 254 swings about the swing shaft 265, causing the swing shaft 264 to move rearward and downward, and the first arm 253 swings accordingly, causing the swing shaft 263 to move rearward. This causes the slide shaft 252 and the slide rod 251 to move rearward. As a result, the slide block 216, which is biased by the compression springs 215A and 215B, to move rearward. This brings the guide portion 212 and the slide block 216 closer to each other in the front-to-rear direction, reducing the distance between the pulley 225A and the pulley 225B.

[0117] On the other hand, when the operator lowers the handle portion 255, as shown in FIG. 10, the second arm 254 swings about the swing shaft 265, causing the swing shaft 264 to move forward and upward, and the first arm 253 swings accordingly, causing the swing shaft 263 to move forward. This causes the slide shaft 252 and the slide rod 251 to move forward. As a result, the slide block 216 moves forward against the biasing forces of the compression springs 215A and 215B. This causes the guide portion 212 and the slide block 216 to move apart in the front-to-rear direction, increasing the distance between the pulleys 225A and 225B.

[0118] <Floating prevention rail 209A / 209B> The anti-lift rails 209A and 209B are long, plate-like members made of a metal material or the like and extending in the front-to-rear direction. As shown in Figures 9 and 10, the anti-lift rail 209A is fixed to the right end of the lower surface of the base plate 202, and the rear end of the anti-lift rail 209A extends further rearward than the rear end of the base plate 202. The anti-lift rail 209B is fixed to the left end of the lower surface of the base plate 202, and the rear end of the anti-lift rail 209B extends further rearward than the rear end of the base plate 202. These anti-lift rails 209A and 209B can prevent the front end of the cylindrical body mounting device 201 from lifting up when the operator lowers the handle portion 255. When the cylindrical body mounting device 201 is used by being fixed to a desk, the anti-lift rails 209A and 209B may be omitted.

[0119] <How to attach the sleeve to the roller> The method of attaching the sleeve S as a cylindrical body made of an elastic material such as rubber to the columnar roller R as a pillar-like body using the cylindrical body attachment device 201 is the same as in the first embodiment.

[0120] Specifically, when attaching a sleeve S to a roller R using the cylindrical body attachment device 201, first, the handle portion 255 is raised, and with the distance between the pulleys 225A and 225B reduced, the sleeve S is attached to the pulleys 225A and 225B so that the sleeve S is hung across the pulleys 225A and 225B (S101).

[0121] Next, the handle portion 255 is lowered to increase the distance between the pulleys 225A and 225B as shown in Fig. 10, thereby applying an external force to the inner peripheral surface Sa of the sleeve S attached to the pulleys 225A and 225B, thereby elastically deforming the sleeve S (S102, the "expansion step" of the present invention). At this time, as shown in Fig. 6(a), the sleeve S is elastically deformed so that the circumferential length of the inner peripheral surface Sa of the sleeve S after elastic deformation becomes L2, which is longer than the circumferential length Lr of the outer peripheral surface Ra of the roller R.

[0122] Next, the handle portion 255 is raised to reduce the distance between the pulleys 225A and 225B, thereby releasing the external force applied from the pulleys 225A and 225B to the inner circumferential surface Sa of the sleeve S (S103, the "release step" of the present invention).

[0123] Next, the elastically deformed sleeve S is removed from pulley 225A and pulley 225B (S104), and as shown in Figures 6(b) and (c), a roller R is inserted into the elastically deformed sleeve S, thereby attaching the sleeve S to the outer surface Ra of the roller R (S105, the "columnar body insertion step" of the present invention).

[0124] <Effects> In the third embodiment, similar to the first embodiment, the sleeve S can be easily attached to the outer peripheral surface Ra of the roller R. Also, in the third embodiment, similar to the first embodiment, even if the rigidity of the sleeve S is low, the sleeve S does not buckle when inserting the roller R into the sleeve. Also, in the third embodiment, similar to the first embodiment, the sleeve S can be attached to rollers R of various sizes using the cylindrical body attachment device 201.

[0125] In addition, the cylindrical body mounting device 1 of the first embodiment is provided with a slide block 14A having an inclined surface 26A, a slide block 14B having an inclined surface 26B, and a tapered block 51 having a tapered surface 61A in contact with the inclined surface 26A and a tapered surface 61B in contact with the inclined surface 26B, and by separating the pulley 25A formed on the slide block 14A and the pulley 25B formed on the slide block 14B in the left-right direction, the sleeve S attached to the pulley 25A and the pulley 25B is elastically deformed. On the other hand, in the third embodiment, without using slide block 14A having inclined surface 26A, slide block 14B having inclined surface 26B, or tapered block 51 having tapered surface 61A in contact with inclined surface 26A and tapered surface 61B in contact with inclined surface 26B, pulley 225A formed on guide portion 212 and pulley 225B formed on slide block 216 are spaced apart in the front-to-rear direction, thereby elastically deforming the sleeve S attached to pulley 225A and pulley 225B. As a result, in the third embodiment, compared to the first embodiment, the weight can be reduced by not using slide block 14A having inclined surface 26A, slide block 14B having inclined surface 26B, and tapered block 51 having tapered surface 61A in contact with inclined surface 26A and tapered surface 61B in contact with inclined surface 26B. Furthermore, in the third embodiment, the sleeve S attached to the pulley 225A and the pulley 225B can be elastically deformed without forming an inclined surface on the guide portion 212, the slide block 216, or the like. That is, the guide portion 212 and the slide block 216 can be manufactured without considering the inclination angle or inclination range of the inclined surface, and therefore the manufacturing process of the cylindrical body mounting device 201 can be simplified.

[0126] <Modification> Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims.

[0127] In the second embodiment, the axial direction of the rollers R arranged in the roller arrangement section 107 is parallel to the axial direction of the sleeves S attached to the fixed pulley 104 and the movable pulley 105, and the rollers R arranged in the roller arrangement section 107 and the sleeves S attached to the fixed pulley 104 and the movable pulley 105 are arranged adjacent to each other in the axial direction, but this is not limited to this. The axial direction of the rollers R arranged in the roller arrangement section 107 and the axial direction of the sleeves S attached to the fixed pulley 104 and the movable pulley 105 may be significantly misaligned to the extent that the rollers R cannot be inserted into the sleeves S simply by moving the sleeves S to the left toward the rollers R. Furthermore, the cylindrical body mounting device 101 of the second embodiment may not include a roller arrangement section, and a roller R arranged in another location may be inserted into an elastically deformed sleeve S.

[0128] In the first embodiment, the taper block 51 is configured to be moved in the front-rear direction by the operator operating the handle portion 55, but this is not limited to this. For example, a different mechanism from that of the first embodiment may be provided, which is operated by the operator, and the taper block 51 may be moved in the front-rear direction by the operator operating this mechanism. Alternatively, for example, the taper block 51 may be connected to a drive mechanism such as an air cylinder controlled by a control device, and the drive mechanism may be driven under the control of the control device to move the taper block 51 in the front-rear direction. In this case, the combination of the compression springs 24A, 24B, the taper block 51, and the drive mechanism corresponds to the "moving mechanism" of the present invention.

[0129] In the first embodiment, the slide blocks 14A and 14B carrying the pulleys 25A and 25B have inclined surfaces 26A and 26B, respectively, inclined relative to the front-to-rear direction, and the tapered block 51 contacts the inclined surfaces 26A and 26B and has tapered surfaces 61A and 61B parallel to the inclined surfaces 26A and 26B. The distance between the pulleys 25A and 25B is changed by moving the tapered block 51 in the front-to-rear direction, thereby moving the slide blocks 14A and 14B in the left-to-right direction. However, this is not limiting. The distance between the pulleys 25A and 25B may be changed by a mechanism different from that described in the first embodiment.

[0130] In the second embodiment, the movable pulley 105 is configured to be moved up and down by the air cylinder 106 driven under the control of the control device 108, but this is not limiting. For example, instead of the air cylinder 106, another drive source driven under the control of the control device, such as a hydraulic cylinder, may be connected, and the movable pulley 105 may be configured to be moved up and down by this other drive source. Alternatively, for example, a mechanism operated by an operator may be connected to the movable pulley 105, and the movable pulley 105 may be moved up and down in response to the operator operating this mechanism.

[0131] Furthermore, in the first embodiment, the distance between the taper block 51 and the slide shaft 52 in the front-rear direction can be adjusted by rotating the mounting pin 62, but this is not limiting. For example, in the first embodiment, the taper block 51 and the slide shaft 52 may be connected in a manner that prevents the distance between them in the front-rear direction from being changed. In this case, the distance between the taper block 51 and the slide shaft 52 in the front-rear direction is set so that, when the handle portion 55 is lowered to the position shown in FIGS. 2, 3(b), and 4(b), the circumferential length of the inner circumferential surface Sa of the sleeve S is longer than the circumferential length of the outer circumferential surface Ra of the largest roller R intended to be attached. In this way, the sleeve S can be attached to rollers R of various sizes with smaller diameters.

[0132] Furthermore, in the second embodiment, the degree of elastic deformation of the sleeve S can be varied by changing the amount by which the movable pulley 105 is moved downward in accordance with the value of the expansion rate parameter stored in the memory unit 109. However, this is not limiting. In the second embodiment, the movable pulley 105 may be moved downward by a uniform amount. In this case, when the movable pulley 105 is lowered, the circumferential length of the inner circumferential surface Sa of the sleeve S is configured to be longer than the circumferential length of the outer circumferential surface Ra of the largest roller R to be attached. In this way, the sleeve S can be attached to rollers R of various sizes with smaller diameters.

[0133] In the first embodiment, the distance between pulley 25A and pulley 25B is changed by moving slide block 14A having pulley 25A and slide block 14B having pulley 25B in opposite directions in the left-right direction, but this is not limiting. One of slide blocks 14A, 14B may be configured not to move in the left-right direction, and the other of slide blocks 14A, 14B may be moved in the left-right direction to change the distance between pulley 25A and pulley 25B.

[0134] In the second embodiment, of the two pulleys arranged side by side in the vertical direction, the upper pulley is a fixed pulley 104 that does not move in the vertical direction, and the lower pulley is a movable pulley 105 that is movable in the vertical direction, but this is not limited to this. For example, of the two pulleys arranged side by side in the vertical direction, the lower pulley may be a fixed pulley that does not move in the vertical direction, and the upper pulley may be a movable pulley that is movable in the vertical direction. Alternatively, both of the two pulleys arranged side by side in the vertical direction may be movable pulleys that are movable in the vertical direction, and the distance between the two movable pulleys may be changed by moving the two movable pulleys in opposite directions in the vertical direction using an air cylinder.

[0135] In the above example, the sleeve S is hung around two pulleys, and the distance between the two pulleys is increased to apply an external force from the pulley to the inner circumferential surface Sa of the sleeve S, thereby elastically deforming the sleeve S so as to increase the circumferential length of the inner circumferential surface Sa of the sleeve S. The distance between the two pulleys is then reduced to release the application of the external force from the pulley to the inner circumferential surface Sa of the sleeve S. However, this is not limited to this. For example, the sleeve S may be hung around three or more pulleys. Then, at least one of the three or more pulleys may be moved to increase the distance between at least two of the three or more pulleys, thereby applying an external force from the pulley to the inner circumferential surface Sa of the sleeve S, thereby elastically deforming the sleeve S so as to increase the circumferential length of the inner circumferential surface Sa of the sleeve S. Then, at least one of the pulleys may be moved to reduce the distance between the at least two pulleys to release the application of the external force from the pulley to the inner circumferential surface Sa of the sleeve S.

[0136] Furthermore, the contact member that comes into contact with the inner peripheral surface Sa of the sleeve S is not limited to a semi-cylindrical pulley. The contact member that comes into contact with the inner peripheral surface Sa of the sleeve S may be a member of another shape, such as a cylindrical or elliptical cylindrical member.

[0137] Furthermore, the application and release of an external force to the inner circumferential surface Sa of the sleeve S may not necessarily be performed by changing the distance between at least two of the two or more contact members that contact the inner circumferential surface Sa of the sleeve S. For example, the sleeve S may be inserted into an airbag, and air may be introduced into the airbag to inflate the airbag, thereby applying an external force to the inner circumferential surface Sa of the sleeve S and lengthening the circumferential length of the inner circumferential surface Sa of the sleeve S. Furthermore, the external force applied to the inner circumferential surface Sa of the sleeve S may then be released by releasing air from the airbag to deflate it.

[0138] Although the above description has been given of an example in which the present invention is applied to a cylindrical body attachment device for attaching a cylindrical body, such as a sleeve S, to a cylindrical body, such as a roller R, the present invention is not limited to this. The present invention can also be applied to a cylindrical body attachment device for attaching an elastically deformable cylindrical body, other than a sleeve, to a cylindrical body other than a roller. For example, the cylindrical body may be the shaft of a golf club, stocks, trekking poles, walking sticks, or the like, and the cylindrical body may be a grip, ferrule, or the like attached to the shaft. Alternatively, the cylindrical body may be the wheel of a hand truck or the like, and the cylindrical body may be a tire attached to the wheel. Alternatively, the cylindrical body may be a handrail, and the cylindrical body may be an anti-slip cover attached to the handrail. Alternatively, the cylindrical body may be a tandem bar of a motorcycle, and the cylindrical body may be a protective cover attached to the tandem bar. The cylindrical body may have both axial ends open, or only one axial end open. The axial direction of the cylindrical body and the cylindrical body may be the longitudinal direction, or the axial length may be shorter than the length perpendicular to the axial direction. [Example]

[0139] <Demonstration experiment of sleeve expansion time and attachment ability> In the cylindrical body mounting method according to the present invention, after expanding the sleeve to make it more flexible, it is necessary to mount it on the roller before the "flexibility" is lost. Therefore, the relationship between the expansion time of the sleeve and the grace period before mounting it on the roller was investigated.

[0140] (Sleeve and roller used in the experiment and experimental method) Sleeve material: Ether-based thermoplastic polyurethane Sleeve hardness: 4 levels: 85, 90, 95, 98 Sleeve size: Inner diameter 46.7 mm, axial length width 30 mm, thickness 1.1 mm Roller outer diameter: 48.6mm The sleeve may be made of commercially available thermoplastic polyurethanes of different hardness grades, such as "Miractran (registered trademark)" manufactured by Nippon Miractoran Co., Ltd. and "Elastollan (registered trademark)" manufactured by BASF, or may be made of Miractoran E385, Miractoran E390, Miractoran E395, Miractoran E398, Elastollan ET385, Elastollan ET890, Elastollan 1195ATR, etc. The hardness was measured using a Type A durometer in accordance with JIS K7215 (1986) "Durometer hardness test method for plastics." The measurement sample was made by cutting open a sleeve and stacking two pieces together to a total thickness of 2.2 mm, and the durometer pressing force was 50 N. The inner diameter of the sleeve was 46.7 mm in the free state and 48.6 mm after being attached to the roller, so the elongation rate after being attached to the roller was approximately 4% ((48.6-46.7) / 46.7). In this experiment, the sleeve was expanded to 20% elongation and held for a specified time, and after the expansion was released, the time for which the sleeve could be easily attached to the roller by hand was measured. The results are shown in Figure 11.

[0141] (Measurement results) As a result of the measurements, it was confirmed that there is a positive correlation between expansion time and installation time, and that the higher the hardness, the longer the installation time, as shown in Figure 11. With a sleeve with a hardness of 85, installation was difficult even after 30 minutes of expansion, but with sleeves with a hardness of 95 or 98, an installation time of 5 seconds or more could be secured by expanding for 1 minute, confirming that workability could be improved.

[0142] <Demonstration experiment on sleeve expansion time and clamping force recovery> In the cylindrical body mounting method according to the present invention, the sleeve becomes more stretchable by expanding it, making it easier to manually mount it on the roller. However, expanding the sleeve may reduce the clamping force of the sleeve on the roller. Therefore, an experiment was conducted to determine whether the clamping force would be restored after the sleeve was expanded. Because it is difficult to measure the clamping force, the test method involved cutting the sleeve in one place parallel to the axial direction to create a strip-shaped measurement sample, stretching this measurement sample using an autograph, and measuring the relationship between the elongation rate and the tensile force.

[0143] (Measurement samples and experimental methods used in the experiment) Measurement sample: A strip sample 30 mm wide and 1.1 mm thick made by cutting a sleeve with a hardness of 95 Autograph chuck distance: 90mm Measurement condition 1 (expansion time 1 minute): Expand to 20% extension at a speed of 100 mm / min → hold for 1 minute → contract to 4% extension at a speed of 500 mm / min and hold Measurement condition 2 (expansion time 60 minutes): Expanded to 20% elongation at a speed of 100 mm / min → held for 60 minutes → Contracted to 4% elongation at a speed of 500 mm / min and held

[0144] Measurement condition 1 had an expansion time of 1 minute, which corresponds to the condition under which the installation time was 5 seconds in the installation verification test. In this case, as shown in Figure 12, the tensile force was 1.65 N 5 seconds after contracting to 4% elongation, and it is estimated that the force with which the sleeve tightens the roller is approximately twice that, at 3.3 N. In other words, by expanding the sleeve, the tightening force drops to 3.3 N or less, making it possible to easily install the sleeve on the roller by hand. Furthermore, 30 minutes after contracting to 4% elongation, the tensile force had recovered to 15.8 N and saturated, confirming that sufficient tightening force was restored after the sleeve was attached to the roller.

[0145] Measurement condition 2 had an expansion time of 60 minutes, and was an experiment intended to confirm whether the tightening force would recover even if the work was interrupted and then resumed while the sleeve was expanded. In this case, as shown in Figure 12, the tensile force was low at -0.52 N 5 seconds after contracting to an elongation rate of 4%, but after 30 minutes the tensile force was 8.7 N and after 785 minutes the tensile force was 15.3 N, confirming that although it took time, the tensile force recovered to a value similar to that when the expansion time was 1 minute. [Explanation of symbols]

[0146] 1,201 Cylindrical body mounting device 25A, 225A Pulley (contact member) 25B, 225B pulley (contact member) 101 Cylindrical body mounting device 104 Fixed pulley (contact member) 105 Movable pulley (contact member) 106 Air cylinder (movement mechanism) 107 Roller arrangement section (columnar body arrangement section) 108 Control device 109 Storage section S sleeve (cylindrical body) R roller (columnar body)

Claims

1. A cylindrical body mounting method for mounting a cylindrical body made of an elastic material on an outer peripheral surface of a columnar body, comprising: an expansion step of elastically deforming the cylindrical body by applying an external force to the inner peripheral surface of the cylindrical body so that the circumferential length of the inner peripheral surface of the cylindrical body becomes longer than the circumferential length of the outer peripheral surface of the columnar body; a releasing step of releasing the application of an external force to the inner peripheral surface of the cylindrical body that has been elastically deformed so that the circumferential length of the inner peripheral surface becomes longer than the circumferential length of the outer peripheral surface of the columnar body; a columnar body inserting step of inserting the columnar body into the cylindrical body after the releasing step.

2. In the expanding step, Inserting a plurality of contact members into the cylindrical body; applying an external force to an inner circumferential surface of the cylindrical body by moving at least one contact member of the plurality of contact members so as to increase a distance between at least two contact members of the plurality of contact members; In the release step, The cylindrical body mounting method according to claim 1, characterized in that the application of external force to the inner surface of the cylindrical body is released by moving at least one contact member so as to reduce the distance between the at least two contact members.

3. 3. The method for attaching a cylindrical body according to claim 2, wherein the at least one contact member is moved by air pressure in the expanding step and the releasing step.

4. the expanding step and the releasing step are performed in a state in which the cylindrical body is arranged so that the axial direction of the cylindrical body is parallel to the axial direction of the columnar body and the columnar body and the cylindrical body are adjacent to each other in the axial direction of the columnar body; The cylindrical body mounting method according to any one of claims 1 to 3, characterized in that in the columnar body inserting step, the cylindrical body is inserted into the cylindrical body by moving the cylindrical body toward the columnar body in an axial direction of the columnar body.

5. A cylindrical body mounting device for mounting a cylindrical body made of an elastic material on an outer peripheral surface of a columnar body, A plurality of contact members inserted into the cylindrical body; a moving mechanism that moves at least one contact member of the plurality of contact members so as to change a distance between at least two contact members of the plurality of contact members; a control device; The control device an expansion process in which the movement mechanism is controlled to move the at least one contact member to increase the distance between the at least two contact members, thereby applying an external force from the multiple contact members inserted into the cylindrical body to the inner peripheral surface of the cylindrical body, thereby elastically deforming the cylindrical body so that the circumferential length of the inner peripheral surface of the cylindrical body becomes longer than the circumferential length of the outer peripheral surface of the pillar-shaped body; A cylindrical body mounting device characterized by performing a release process that controls the moving mechanism to move at least one contact member and reduce the distance between the at least two contact members, thereby releasing the application of external force from the multiple contact members to the inner surface of the elastically deformed cylindrical body.

6. a storage unit configured to store a value of an expansion rate parameter indicating how much the circumferential length of the inner circumferential surface of the cylindrical body is to be increased; The control device 6. The cylindrical body mounting device according to claim 5, wherein in the expansion process, the at least one contact member is moved by an amount corresponding to the value of the expansion rate parameter stored in the storage unit.

7. the moving mechanism has an air cylinder as a drive source for moving the at least one contact member, 6. The cylindrical body mounting device according to claim 5, wherein the control device controls the air cylinder.

8. A cylindrical body mounting device as described in any one of claims 5 to 7, characterized in that it is provided with a columnar body arrangement section in which the columnar body is arranged so that the axial direction of the columnar body and the axial direction of the cylindrical body into which the contact member is inserted are parallel, and the columnar body and the cylindrical body into which the contact member is inserted are lined up adjacent to each other in the axial direction of the cylindrical body.

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