JP2006347726A - Cylindrical body holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical body holder capable of stably and surely holding a core, by restraining eccentricity of the core in a state of holding a cylindrical body, by eliminating generation of a slip between a chuck body and a driving shaft, while restraining an increase in cost with a simple structure. <P>SOLUTION: This cylindrical body holder 1 has a holder 5 inserted and fitted in a hollow part 2 inside of the cylindrical body 3 and having an intermediate shaft 4 arranged in the cylindrical body 3 and a cylindrical rubber body 6 arranged in an outer peripheral part 4a of the intermediate shaft 4, and has a pressing means 9 having a pressing part 7 pressing the cylindrical rubber body 6 and the driving shaft 8 displacing the pressing part 7, and holds the cylindrical body 3 from the inside by swelling the cylindrical rubber body 6 in the circumferential direction by operating the pressing means 9 by compressed air. The intermediate shaft 4 is provided with a guide key 12 guiding the cylindrical rubber body 6 along the intermediate shaft 4, and the cylindrical rubber body 6 is characterized by arranging a key groove 6d corresponding to the guide key 12 in an inner peripheral part 6c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a cylindrical body holding device for holding a hollow shaft for winding / unwinding a web, a hollow shaft for conveyance, and the like, and in particular, inserts a holding body into the cylindrical body to form the cylindrical body. The present invention relates to a cylindrical body holding device configured to hold a body.

  Conventionally, in order to hold a cylindrical body (hollow shaft) having a cylindrical hollow portion, a cylindrical body holding device that grips the hollow portion of the cylindrical body from the inside has been used.

  For example, as an example of the prior art, as shown in FIGS. 4 and 5, a chuck body (jaw) 106 is inserted into the hollow portion 2 of the cylindrical body 3, and the chuck body 106 is inserted into the hollow portion of the cylindrical body 3. A cylindrical body holding device 101 is known in which the cylindrical body 3 is gripped from the inner side by opening radially outward in the circumferential direction.

  Specifically, as shown in FIG. 6, the cylindrical body holding device 101 has a tip end portion 108 a of a drive shaft 108 that operates the chuck body 106 as a tapered shape, and a chuck having a sliding surface 106 a along the tapered shape. A plurality of bodies 106 are arranged along the outer periphery of the tapered tip, and the piston 191 moves the drive shaft 108 in the front-rear direction (the direction along the axis of the drive shaft), whereby the chuck body 106 is moved. It expands and contracts radially outward in the circumferential direction.

  As another example, the inside of the cylindrical body is held by using an expansion cylinder in which the internal space is expanded by air pressure (compressed air) and bulges toward the outer periphery instead of the chuck body described above. A cylindrical body holding device has been proposed (see Patent Document 1).

Furthermore, instead of the compressed air described above, a cylindrical shape in which the outer periphery of the rubber elastic body is bulged outward (radially) by pressing the rubber elastic body along the axial direction by a screw feed method. A body holding device has been proposed (see Patent Document 2).
Microfilm of actual application No.49-1003005 Microfilm of actual application No. 58-91076

However, the conventional method has the following problems.
For example, in the conventional method, the inner peripheral surface of the chuck body 106 is in close contact with the outer peripheral surface of a drive shaft (not shown), and the drive shaft of the chuck body 106 is fixed by the frictional force between the outer peripheral surface and the inner peripheral surface. Since (friction force) <(fixed friction force between the chuck body 106 and the cylindrical body 3), there is a possibility that the chuck body 106 and the drive shaft are used when used as a high tension winding / feeding chuck. There is a problem that slip occurs between the two.

  The chuck body 106 is slidably fitted in a holder (not shown) that slides in the radial direction, and the holder is fixed to the cylinder body, so that the chuck body 106 and the cylindrical body 3 Torque slip does not occur in the range where the frictional force is maintained. However, since the chuck body 106, the holder, and the tapered drive shaft 108 have complicated shapes and a large number of parts, there is a problem that processing costs increase when they are replaced as consumable parts.

  Furthermore, according to the method described in Patent Document 1, there is a problem that the support of the cylindrical body by the expansion cylinder becomes unstable due to the structure.

  Moreover, according to the method described in Patent Document 2, there is a problem that it is difficult to reproduce a stable holding force by manual work.

  The present invention has been made in view of the above-described conventional problems, and can suppress an increase in cost by reducing the number of components with a simple structure, and eliminates the occurrence of slip between the chuck body and the drive shaft. Furthermore, an object of the present invention is to provide a cylindrical body holding device that can suppress the eccentricity of the core in a state where the cylindrical body is held as much as possible, and can stably and reliably hold the core.

The configuration of the cylindrical body holding device according to the present invention for solving the above-described problems is as follows.
The cylindrical body holding device according to claim 1 is inserted into a hollow portion inside the cylindrical body and has a middle body arranged along the axial direction of the cylindrical body, and an outer periphery of the middle shaft A cylindrical rubber body disposed along the axial direction of the central shaft, and a pressing portion that comes into contact with and presses the cylindrical rubber body in the axial direction of the central shaft inside the central shaft And a pressing means having a drive shaft that is displaceable along the axis of the central shaft, and the pressing means is operated by compressed air to move the cylindrical rubber body in the circumferential direction. In the cylindrical body holding device that holds the cylindrical body from the inside along the inner peripheral surface of the hollow portion by bulging, the middle shaft guides the cylindrical rubber body along the axial direction of the middle shaft. A first guide portion is provided, and the cylindrical rubber body faces an outer peripheral portion of the central shaft. The inner peripheral portion, and is characterized in that the second guide portion corresponding to said first guide portion is provided.

  In addition to the configuration described in claim 1, the cylindrical body holding device described in claim 2 is provided with a third guide portion corresponding to the first guide portion as a configuration of the pressing portion. It is a feature.

  In addition to the configuration described in claim 1 or 2, the cylindrical body holding device described in claim 3 is configured such that, as the configuration of the middle shaft, the drive shaft is disposed on the inner peripheral portion facing the outer peripheral portion of the drive shaft. A fourth guide portion is provided for guiding along the axial direction of the middle shaft, and the drive shaft has a fifth outer portion corresponding to the fourth guide portion on the outer peripheral portion corresponding to the inner peripheral portion of the middle shaft. The guide portion is provided.

  According to a fourth aspect of the present invention, in addition to the configuration described in any one of the first to third aspects, the cylindrical body holding device is provided with the first guide portion at a plurality of locations. Is.

  According to the cylindrical body holding device described in claims 1 to 4 of the present invention, as a configuration of the middle shaft that is inserted into the hollow portion inside the cylindrical body and arranged along the axial direction of the cylindrical body. The cylindrical rubber body is provided with a first guide portion that guides a cylindrical rubber body disposed along the axial direction of the central shaft along the axial direction of the central shaft at an outer peripheral portion of the central shaft. As described above, the second guide portion corresponding to the first guide portion is provided on the inner peripheral portion facing the outer peripheral portion of the central shaft, thereby suppressing an increase in cost by reducing the number of components with a simple structure. It is possible to eliminate slippage between the cylindrical rubber body (chuck body) and the drive shaft, and to suppress the eccentricity of the core holding the cylindrical body as much as possible, and to hold the core stably and securely. An excellent effect that it can be performed can be achieved.

  Moreover, in addition to the common effect obtained by the inventions according to claims 1 to 4, the following effect can be obtained according to the invention according to claim 2.

  That is, according to the invention described in claim 2, as a configuration of the pressing portion, the third guide portion corresponding to the first guide portion is provided, whereby the pressing portion in the pressed state is changed to the third guide portion. Thus, the cylindrical rubber body can be more reliably fixed without being displaced in the circumferential direction.

  According to the third aspect of the present invention, as a configuration of the middle shaft, a fourth guide that guides the drive shaft along an axial direction of the middle shaft to an inner circumferential portion facing the outer circumferential portion of the drive shaft. When the drive shaft is operated by providing a fifth guide portion corresponding to the fourth guide portion on the outer peripheral portion corresponding to the inner peripheral portion of the middle shaft as a configuration of the drive shaft. In addition, since the middle shaft and the drive shaft can be reliably operated only in the direction along the axis without being displaced in the circumferential direction (rotation direction), the cylindrical rubber body is pressed in a stable state. be able to.

  According to the invention described in claim 4, the cylindrical rubber body can be fixed more reliably without being displaced in the circumferential direction by providing the first guide portion at a plurality of locations.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 are examples of embodiments for carrying out the invention. FIG. 1 is an external view showing an overall configuration of a cylindrical body holding device according to an embodiment of the present invention, and FIG. 2 is a diagram of the cylindrical body holding device. FIG. 3 is a side sectional view showing a state in which the shaft cylinder is held by the cylindrical body holding device.

  As shown in FIGS. 1 and 2, the cylindrical body holding device 1 of the present embodiment holds a cylindrical body 3 having a hollow portion 2 therein, and is inserted into the hollow portion 2. A holding body 5 having a middle shaft 4 arranged along the axial direction of the cylindrical body, and a cylindrical rubber body 6 arranged along the axial direction of the middle shaft 4 on the outer peripheral portion of the middle shaft 4 are provided. Further, a pressing portion 7 that comes into contact with and presses the cylindrical rubber body 6, and is displaceable along the axial direction of the intermediate shaft 4 inside the intermediate shaft 4, and the pressing portion 7 is displaced along the axial direction of the intermediate shaft 4. A pressing means 9 having a drive shaft 8 is provided.

  As shown in FIG. 3, the cylindrical body holding device 1 operates the pressing means 9 with compressed air to bulge the cylindrical rubber body 6 in the circumferential direction in the hollow portion 2 of the cylindrical body. The cylindrical body 3 is held from the inside along the inner peripheral surface 3a.

  As shown in FIG. 1, the holding body 5 has a columnar shape, an opening 5 a 1 is formed on one side surface 5 a side, and a cylindrical hollow portion 51 is formed inside the holding body 5. The holding body 5 has a function as an air cylinder.

  On one side surface 5a of the holding body 5, a base body 11 that is fitted so as to close the opening 5a1 described above is provided. On the other hand, on the other side surface 5 b of the holding body 5, an intermediate shaft 4 having a substantially cylindrical shape is integrally projected with the holding body 5 having the same axis.

  A concave portion 5c1 is formed in the outer peripheral portion 5c of the holding body 5, and an air injection plug 52 is provided in the concave portion 5c1 so as not to protrude from the outer peripheral portion 5c. In the present embodiment, the air injection plugs 52 are provided at two locations on the circumference 2 of the outer peripheral portion 5c.

  An air passage 53 communicating with the air injection plug 52 and communicating with the hollow portion 51 is formed inside the holding body 5 on the other side surface 5 b side.

  As shown in FIG. 2, the outer periphery 4 a of the middle shaft 4 is formed so that the cylindrical rubber body 6 and the pressing portion 7 can be engaged with each other, and in the vicinity of the base rising from the other side surface 5 b of the holding body 5, The rubber body 6 is positioned in the axial direction, and a positioning portion 41 is formed which is recessed in the direction of the other side surface 5b along the axial direction in which a part of one end 6a of the cylindrical rubber body 6 is fitted. .

  The outer peripheral portion 4a has a guide key (first guide portion) for restricting the movement of the cylindrical rubber body 6 and the pressing portion 7 along the circumferential direction and guiding the central rubber shaft 4 along the axial direction. 12 is provided.

  The guide key 12 is formed with a length that can be engaged with the cylindrical rubber body 6 and the pressing portion 7 disposed on the middle shaft 4 in a normal state (a state in which the cylindrical rubber body 6 is not pressed by the pressing means 9). Yes. In the present embodiment, the guide key 12 is provided at three positions at the circumference 3 of the outer peripheral portion 4a, and is screwed into the key groove 4b formed on the central shaft 4 by the fixing screw 12a.

  The middle shaft 4 is formed with a guide hole 42 through which the drive shaft 8 can slide along the axial direction through the inside of the middle shaft 4 and through the hollow portion 51 of the holding body 5. Has been. A key groove (fourth guide portion) 42 b corresponding to a guide key (fifth guide portion) 13 for guiding the drive shaft 8 in the axial direction of the central shaft 4 is formed in the inner wall portion 42 a of the guide hole 42. Is formed.

  The cylindrical rubber body 6 is made of urethane rubber, and has an inner diameter dimension substantially the same as an outer diameter dimension of the central shaft 4. ) 6d is formed along the axial direction of the cylindrical rubber body 6. In the present embodiment, the key grooves 6d are formed at three positions corresponding to the three guide keys 12 at three circumferential positions on the inner peripheral portion 6c.

Here, the pressing means 9 will be described in detail with reference to the drawings.
Specifically, as shown in FIG. 2, the pressing means 9 includes, in addition to the pressing portion 7 and the drive shaft 8 described above, a piston 91 that drives (pushes and pulls along the axial direction) the drive shaft 8, and the drive shaft. 8 includes a stopper 92 that regulates the position of the pulling side 8 and a compression coil spring 93 that assists the movement of the piston 91.

  The pressing portion 7 is tapered so that the distal end portion 7a can be easily attached to the hollow portion 2 of the cylindrical body 3, and the middle shaft 4 is engageable with one end portion 7b that contacts the cylindrical rubber body 6. The opening 7b1 is formed as an opening, and a concave positioning portion 71 is formed that is recessed in the distal direction along the axial direction in which a part of the other end 6b of the cylindrical rubber body 6 is fitted.

  The inner diameter of the opening 7b1 is substantially the same as the outer diameter of the central shaft 4, and a key groove (first groove) corresponding to the guide key 12 is formed in the inner peripheral portion 7c formed continuously depressed from the opening 7b1. 3 guide part) 7 d is formed along the axial direction of the pressing part 7. In the present embodiment, the key grooves 7d are formed at three positions corresponding to the three guide keys 12 at three equal circumferential positions on the inner peripheral portion 7c. In addition, the inner peripheral part 7c is formed in the range in which the front-end | tip part of the center axis | shaft 4 can stroke.

  An attachment hole 7a1 for connecting to the drive shaft 8 is formed at the center of the distal end portion 7a of the pressing portion 7, and the pressing portion 7 is integrally connected to the drive shaft 8 by a fixing nut 72. Yes.

  The drive shaft 8 penetrates the middle shaft 4 from the hollow portion 51 of the holding body 5 and is slidably disposed along the axial direction, and the piston 91 and the fixing ring 81 disposed in the hollow portion 51. 82 is integrally formed.

  An O-ring groove is formed and an O-ring 83 is incorporated in the outer peripheral portion of the drive shaft 8 facing the guide hole 42 of the middle shaft 4. The O-ring 83 enhances the hermeticity of the boundary portion between the guide hole 42 and the drive shaft 8.

  At one end portion 8b of the drive shaft 8, an engagement hole 8b1 attached to one side surface 5a of the holding body 5 and slidably engaged with the stopper 92 is stroked along the axial direction. Formed to allow range. An air passage 8b2 is formed at a predetermined depth along the axial direction in a continuous manner with the engagement hole 8b1. Further, a communication hole 8b3 that communicates the air passage 8b2 and the air introduction space 91b1 is formed.

  Here, the “predetermined depth” is a depth at which the air introduction space 91b1 of the piston 91 is located at least in the radial direction of the drive shaft 8 in a state where the piston 91 is incorporated in the drive shaft 8.

  A screw portion 8 a 1 that is assembled into the attachment hole 7 a 1 of the pressing portion 7 and is fastened by a fixing nut 72 is formed at the distal end portion 8 a of the drive shaft 8. In addition, after the pressing portion 7 is fastened and fixed to the tip portion, a tapping process is applied to a boundary portion between the fixing nut 72 and the screw portion 8a1 in a plan view, and a set screw 73 is screwed and fixed thereto. The nut 72 is prevented from rotating.

  The piston 91 has a columnar shape, and an O-ring groove is formed in an outer peripheral portion 91c facing the inner wall portion 51a of the hollow portion 51, and an O-ring 91r is incorporated therein.

  An air introduction space 91b1 that is recessed in a range including the opening hole 53a of the air passage 53 formed in the bottom surface 51b is formed on one side surface 91b facing the bottom surface 51b of the hollow portion 51 of the piston 91. On the other hand, on the other side surface 91a of the piston 91, a spring seat portion 91a1 for positioning the compression coil spring 93 is formed in a concave shape.

  A mounting hole 91d through which the drive shaft 8 is slidably inserted along the axial direction is formed in the central portion of the piston 91. An O-ring groove is formed in the outer peripheral portion of the drive shaft 8 facing the mounting hole 91d, and an O-ring 84 is incorporated. The O-ring 84 enhances the hermeticity of the boundary portion between the mounting hole 91d and the drive shaft 8.

  The stopper 92 is provided at the center portion of the base body 11 attached to the one side surface 5 a of the holding body 5, and is formed on a fitting portion 92 a that fits the base body 11 and one end portion 8 b of the drive shaft 8. And an engaging portion 92b engaged with the joint hole 8b1. In the central portion of the stopper 92, an air introduction port 92c1 is formed, and an air passage 92c for introducing air along the axial direction is formed through. An air injection plug 92d is attached to the air introduction port 92c1.

  An O-ring groove is formed in the outer peripheral portion of the fitting portion 92a facing the mounting hole 11b of the base body 11, and an O-ring 92r1 is incorporated to provide a hermetic seal at the boundary between the mounting hole 11b and the fitting portion 92a. It is increasing.

  In addition, an O-ring groove is formed in the outer peripheral portion of the engaging portion 92b facing the engaging hole 8b1 of the drive shaft 8 and an O-ring 92r2 is incorporated, so that a boundary portion between the engaging hole 8b1 and the drive shaft 8 is formed. Improves airtightness.

The base body 11 is attached to the holding body 5 with mounting bolts 14.
On one side surface 11a arranged in the hollow portion 51 inside the holding body 5 of the base body 11, a spring seat portion 11a1 for positioning the compression coil spring 93 is formed in a concave shape at a position facing the spring seat portion 91a1 of the piston 91. Has been.

Next, the operation of the cylindrical body holding device 1 according to this embodiment will be described.
First, when the cylindrical body 3 is held by the cylindrical body holding device 1, as shown in FIG. 2, the central shaft 4 of the holding body 5 is arranged in the hollow portion 2 of the cylindrical body 3.
Then, compressed air is injected from an air injection plug 52 provided on the holding body 5.

  The injected air enters the air introduction space 91b1 of the piston 91 through the air passage 53 as shown in FIG. 2, and resists the spring force of the compression coil spring 93 as shown in FIG. Acts in a direction to push the base toward the base body 11 side.

  When the piston 91 moves and air pressure is applied over the entire surface of the side surface 91b of the piston 91, a larger force acts in the direction of pushing the piston 91 toward the base body 11 side.

  Since the pressing portion 7 is configured integrally with the piston 91 via the drive shaft 8, the pressing portion 7 is displaced toward the cylindrical rubber body 6. As the piston 91 moves toward the base body 11, the pressing portion 7 comes into contact with the cylindrical rubber body 6 and further presses the cylindrical rubber body 6.

  At this time, the drive shaft 8 can move reliably along the axial direction of the middle shaft 4 without being rotationally displaced in the circumferential direction by the guide key 13. Further, the pressing portion can be reliably moved along the axial direction of the middle shaft 4 without being rotationally displaced in the circumferential direction by the guide key 12. Thus, the cylindrical rubber body 6 can be pressed by the pressing portion 7 with a stable operation.

  On the other hand, the cylindrical rubber body 6 is sandwiched between the positioning portion 41 of the central shaft 4 and the positioning portion 71 of the pressing portion 7 and is pressed in parallel and uniformly by the pressing portion 7 and compressed along the axial direction. Is done.

  At this time, the cylindrical rubber body 6 is not deformed to the inner diameter side because the inner diameter side is fitted to the outer diameter of the middle shaft 4, and the volume of the cylindrical rubber body 6 does not change. The compressed volume expands in the outer diameter direction. That is, as shown in FIG. 3, the cylindrical rubber body 6 gradually bulges from both ends in the axial direction, and is deformed into a substantially drum shape in which the central portion in the axial direction where pressure is applied bulges outward most. .

  The cylindrical rubber body 6 is formed of a uniform rubber material and has an inner diameter and an outer diameter that are coaxial. Therefore, the inner diameter and the outer diameter on any same plane perpendicular to the axial direction can be obtained. Is always concentric and expands uniformly outward in the circumferential direction.

  Therefore, the cylindrical body 3 has the cylindrical rubber body 6 axially contacted and pressure-bonded with the outer peripheral portion of the cylindrical rubber body 6 and the inner peripheral surface 3a of the cylindrical body 3 uniformly. The center of the body 6, that is, the center of the center shaft 4 coincides with that of the center shaft 4, and the core 6 is securely held by the support body 5 integrally formed with the center shaft 4 without being eccentric.

  Next, when releasing the holding state of the cylindrical body 3 by the cylindrical body holding device 1, an air venting jig (not shown) is attached to the air injection plug 52, and the hollow portion inside the holding body 5 is installed. Air is exhausted from 51.

  Thereby, while the pressure inside the holding body 5 falls, the pressure applied to the bottom face 51b of the piston 91 falls. When the spring force of the compression coil spring 93 and the elastic force of the cylindrical rubber body 6 are superior to the air pressure, the length of the cylindrical rubber body 6 is restored along the axial direction, and the outer diameter is reduced from the compressed state. Restored by elastic force. That is, since the outer diameter of the cylindrical rubber body 6 is reduced, the holding state of the cylindrical body 3 is released away from the inner peripheral wall of the cylindrical body 3.

  Since it comprised as mentioned above, according to the cylindrical body holding | maintenance apparatus 1 of this embodiment, when providing the guide keys 12 and 13, when operating the piston 91 and displacing the press part 7, the center shaft 4 And the drive shaft 8 and the pressing portion 7 can be prevented from being displaced in the rotational direction, so that not only the frictional force between the outer peripheral surface of the central shaft 4 and the inner peripheral surface of the cylindrical rubber body 6 due to the pressing of the cylindrical rubber body 6 but also the guide It can be used as a high tension take-up / feed-out chuck due to the shear resistance of the parts (guide keys 12, 13, etc.).

  Therefore, according to the present embodiment, the eccentricity of the cylindrical rubber body 6 and the cylindrical body 3 can be suppressed as much as possible with a simple configuration, and the cylindrical rubber body 6 and the central shaft 4 are displaced in the cylindrical direction. The cylindrical body 3 can be reliably held.

  In the present embodiment, the guide key 12 and 13 and the key grooves 6d, 7d, and 42d constitute the guide portion. However, the present invention is not limited to the aspect of the present embodiment. The configuration of the keyway may be any as long as it is appropriately configured so that the components that slide and displace relatively act.

  Furthermore, in this embodiment, the guide key 12 is provided at three locations on the outer peripheral portion 4a of the middle shaft 4, and the guide key 13 is provided at two locations on the outer peripheral portion 8c of the drive shaft 8. The number to be installed is not limited and may be provided as appropriate.

  Further, according to the present embodiment, the concave positioning portion 41 is provided at the portion of the central shaft 4 that contacts the one end portion 6 a of the cylindrical rubber body 6, and the other end portion 6 b of the cylindrical rubber body 6 of the pressing portion 7 is in contact with the other end portion 6 b. By providing the concave positioning portion 71 at the contacting portion, the cylindrical rubber body 6 can be easily and reliably positioned and held. When the cylindrical rubber body 6 is pressed by the pressing portion 7, the cylindrical rubber body 6 can be positioned and held. The rubber body 6 can be pressed evenly and stably.

  Furthermore, according to the present embodiment, the air introduction part for introducing the compressed air for operating the piston 91 is provided at two locations of the outer peripheral part 5c of the holding body 5 and the stopper 92 attached to the base body 11. Since the air injection plugs 52 and 92d are respectively provided, it is possible to cope with the installation state of the apparatus and the attachment state of the cylindrical body.

  Further, according to the present embodiment, the O-rings 83 and 84 are provided at the boundary portions corresponding to the sliding components and the corresponding components, that is, the piston 91, the stopper 92, the drive shaft 8, the holding body 5, and the middle shaft 4. , 91r, 92r1, 92r2 are incorporated, the airtightness inside the holding body 5 is enhanced, so that the piston 91 can be operated reliably without the compressed air leaking.

  Furthermore, in this embodiment, since the cylindrical rubber body 6 is formed with a size substantially the same as the outer diameter of the outer peripheral portion of the central shaft 4 and attached by fitting, the cylindrical rubber body 6 is damaged. Even if it exists, since it can be attached or detached easily, maintenance property can be improved.

  In this embodiment, urethane rubber is used as the material of the cylindrical rubber body 6, but the present invention is not limited to the type of rubber material that forms the cylindrical rubber body. Rubber, natural rubber, or the like may be used, and a rubber material with good compression deformation and restoration properties is desirable.

  Moreover, although the cylindrical rubber body 6 of this embodiment is comprised with the single rubber material, if this invention is a flexible elastic body and has a restoring force, it will be a cylindrical rubber body. It is not limited to the configuration or material, for example, a combination of a plurality of rubber materials, or a synthetic resin having a self-lubricating property is coated on the contact surface with the outer peripheral portion of the central shaft 8, so It may be designed to facilitate displacement.

  Furthermore, the cylindrical body holding device of the present invention is not limited to the illustrated example described above, and various changes such as the configuration of the guide portion and the installation position can be made without departing from the gist of the present invention. Of course.

It is an external view which shows the whole structure of the cylindrical body holding | maintenance apparatus which concerns on embodiment of this invention. It is side surface sectional drawing which shows the structure of the said cylindrical body holding device. It is side surface sectional drawing which shows the state which hold | maintained the axial cylinder by the said cylindrical body holding | maintenance apparatus. It is a side view which shows an example of a structure of the conventional cylindrical body holding | maintenance apparatus. It is a front view which shows the structure of the said cylindrical body holding device. It is side surface sectional drawing which shows the structure of the said cylindrical body holding device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical body holding | maintenance apparatus 2 Hollow part 3 Cylindrical body 4 Medium shaft 5 Holding body 6 Cylindrical rubber body 6d Keyway (2nd guide part)
7 Pressing part 7d Keyway (third guide part)
8 Drive shaft 8b2 Air passage 8b3 Communication hole 9 Pressing means 11 Base body 12 Guide key (first guide portion)
13 Guide key (5th guide part)
41, 71 Positioning part 42b Keyway (fourth guide part)
51 Hollow portion 52, 92d Air injection plug 53, 92c Air passage 53a Opening hole 72 Fixing nut 81, 82 Fixing ring 83, 84, 91r, 92r1, 92r2 O-ring 91 Piston 91b1 Air introduction space

Claims (4)

A holding body having a middle shaft that is inserted into a hollow portion inside the cylindrical body and disposed along the axial direction of the cylindrical body, and is disposed along the axial direction of the middle shaft on the outer peripheral portion of the central shaft. A cylindrical rubber body, and a pressing portion that contacts and presses against the cylindrical rubber body, and is displaceable along the axial direction of the central shaft inside the central shaft, and the pressing portion is a shaft of the central shaft. A pressing means having a drive shaft that is displaced along the center direction;
In the cylindrical body holding device that holds the cylindrical body from the inside along the inner peripheral surface of the hollow portion by operating the pressing means by compressed air to bulge the cylindrical rubber body in the circumferential direction.
The middle shaft is provided with a first guide portion that guides the cylindrical rubber body along the axial direction of the middle shaft,
The cylindrical rubber body is provided with a second guide portion corresponding to the first guide portion on an inner peripheral portion facing the outer peripheral portion of the central shaft.   The cylindrical body holding device according to claim 1, wherein the pressing portion is provided with a third guide portion corresponding to the first guide portion. The middle shaft is provided with a fourth guide portion that guides the drive shaft along the axial direction of the middle shaft on an inner circumferential portion facing the outer circumferential portion of the drive shaft.
The cylinder according to claim 1 or 2, wherein the drive shaft is provided with a fifth guide portion corresponding to the fourth guide portion on an outer peripheral portion corresponding to the inner peripheral portion of the middle shaft. A body holding device. The cylindrical body holding device according to any one of claims 1 to 3, wherein the first guide portion is provided at a plurality of locations.

Images