JP2010162664A - Device and method for extracting friction-drive roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extracting device that surely and smoothly extracts a roller body by short claws that are easily insertable also into a narrow space below the roller body. <P>SOLUTION: The extracting device includes: a plurality of arm rods 62 each having a claw 64, inserted into a space below the lower face of a roller body 52 and inwardly facing each other, at each tip; a screw rod 71 whose tip is brought into contact with the upper face of a rotational-drive shaft 51 while inserting the claws 64 of the arm rods 62 into the space below the lower face of the roller body 52; and a backing plate 75 that is inserted between the claws 64 of the arm rods 62 and the lower face of the roller body 52. The arm rod 62 includes a screwing-insertion part 63 wherein the distance in-between the claws 64 is relatively changed by allowing the screw rod 71 to be screwed thereinto. The backing plate 75 includes an elongate hole 77 extending from the outer peripheral part to the central part, a thickness that allows the backing plate to be inserted between the claws 64 of the arm rod 62 and the lower face of the roller body 52, and an outer diameter that allows the claws 64 of the arm rods 62 to be locked by the lower face of the roller body 52. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a friction drive roller body extraction device used for a turntable such as a multilevel parking device, and a method for extracting the friction drive roller body.

  Conventionally, for example, in a general multilevel parking device, a turntable for changing the direction of a vehicle is installed between an entrance / exit of the parking device and an external road so that the vehicle can enter and leave the external road. It is always possible to do forward driving.

  As this turntable, various drive systems are used, but friction is the most popular because of its simple structure, low cost, and ease of installation and maintenance. This is a driving (friction) method. This friction drive type turntable is generally provided with an annular rail on the peripheral surface (or lower surface or upper surface) of the outer periphery of a disk-shaped table body, and a rotational drive shaft that is rotationally driven by a drive motor via a speed reducer. The outer peripheral surface of the axially attached friction drive roller body is pressed against the annular rail and rotated (see, for example, Patent Document 1).

  The friction drive roller body for rotating the turntable is generally composed of a metal annular core part fitted on the rotary drive shaft and an outer peripheral surface of the core part for high frictional force and low noise. And a roller portion such as a hard resin material (for example, urethane resin) that is fixed to the roller (see Patent Document 1).

  By the way, such a friction drive roller body cannot avoid falling foreign matter from the gap between the outer periphery of the table body and the surrounding floor being bitten into the roller part, and wear deterioration during periodic maintenance inspections. If so, the entire friction drive roller body is immediately replaced. In the replacement operation of the friction drive roller body, first, the operation of removing the friction drive roller body from the rotary drive shaft is performed. In this sampling operation, a sampling tool generally called a “puller” is used. This extraction tool is known to have various structures (see, for example, Patent Documents 2 and 3), but the simplest structure is provided with a claw portion formed inwardly facing the lower ends of both legs. And a screw rod (also referred to as a jack bolt) screwed into a vertical screwing portion provided at the center of the upper horizontal portion of the armband (patent) Reference 2).

  FIG. 7 is a longitudinal sectional view showing a state at the time of extracting the friction drive roller body by a conventional extraction tool. A general roller body extraction operation will be described with reference to FIG. The extraction operation of the roller body 102 by the extraction tool 101 is performed by first moving the claw portion 103 horizontally so as to surround the roller body 102 with the portal arm 104 of the extraction tool 101 so that the claw portion 103 is positioned below the roller body 102. Inserted from the direction, the lower end of the screw rod 105 is brought into contact with the upper end surface of the rotation drive shaft 106 at the center of the roller body 102. From this state, by rotating the screw rod 105 in the screwing direction (the direction in which the claw portion 103 of the arm rod 104 and the lower end of the screw rod 105 approach each other), the both claw portions 103 are brought into contact with the lower surface of the roller body 102 ( The state of FIG.

  In the case of the general roller body 102, the screw rod 105 is further rotated in the screwing direction from this state, so that the screw rod 105 rotates in contact with the upper end surface of the rotary drive shaft 106. The arm rod 104 is pulled up relatively with respect to 105, and the roller body 102 (core metal portion 102 a + roller portion 102 b) is extracted from the rotation drive shaft 106.

JP 2007-56491 A JP 2001-347470 A Utility Model Registration No. 2547708

  However, as shown in FIG. 7 above, in the drive device installed in a narrow space around the turntable, there is a speed reducer casing 107 below the roller body 102 that is pivotally attached to the rotary drive shaft 106. The space around the shaft 106 is very narrow and complicated by fixtures (mounting plates, bolts, etc.) of the support mounting portion 108 of the rotary drive shaft 106, and the clearance S between the speed reducer casing 107 and the roller body 102 is small. Very narrow (for example, about 10 to 15 mm). On the other hand, as shown in FIG. 7, the claw portion 103 of the extraction tool 101 that is generally commercially available is formed to be short and tapered with the base thickened in order to increase the strength.

  Therefore, even when the claw portion 103 of the extraction tool 101 can be inserted below the roller body 102 during the above-described extraction operation of the roller body 102, the short claw portion 103 does not reach the core metal portion 102a, and the resin roller There is a case where only the end portion of the claw portion 103 reaches only the core portion 102a. If the extraction operation is forcibly performed in this state, if the rotation drive shaft 106 and the cored bar portion 102a are firmly fitted, only the roller portion 102b made of a resin material that is weaker than the cored bar portion 102a is strongly pulled out. A force (compression force) is applied, and the roller body 102 cannot be pulled out only by collapsing a part of the roller portion 102b (for example, a broken portion shown in the figure).

  On the other hand, as another method, as shown in a longitudinal sectional view showing a state of extraction of the friction drive roller body by another conventional extraction tool shown in FIG. It is also conceivable to use an extraction tool 111 in which the claw portion 113 is formed long so as to reach the portion 102a sufficiently. However, in that case, the tip portion 113a of the claw portion 113 is elongated and the strength is reduced, so that special heat treatment processing for strengthening the hardness such as quenching the tip portion 113a is necessary, A lot of processing costs are required. In addition, even in the case of the long and narrow claw portion 113 that secures the hardness in this way, it may be difficult to insert the claw portion 113 into the gap S depending on the complicated uneven state around the gap S. .

  Therefore, the present invention can reliably and smoothly remove the roller body with a short claw part that can be easily inserted into a narrow space below the roller body even when the extraction claw part does not reach the core part of the roller body. It is an object of the present invention to provide a possible extraction device and an extraction method thereof.

  In order to achieve the above object, a friction drive roller body extraction device according to the present invention includes a core metal part driven by a rotary drive shaft, and a roller body having a friction drive system on the outer periphery of the core metal part. And a plurality of arm hooks having inwardly facing claw parts inserted into the lower surface of the roller body at the tip, and the claw parts of the arm hooks of the roller body. A screw rod that abuts the tip on the upper surface of the rotary drive shaft in a state of being inserted into the lower surface, and a contact plate that is inserted between the claw portion of the arm rod and the lower surface of the roller body, And a screw insertion portion in which a distance from the claw portion is relatively changed by screwing the screw rod and screwing, and the abutting plate extends from an outer peripheral portion to a central portion and is connected to the rotation drive shaft in a predetermined manner. Between the slot that can be inserted with a gap between the claw portion of the armband and the lower surface of the roller body And thickness can be inserted, characterized in that it has an outer diameter that can lock the pawl portion of the arm rod on the lower surface of the roller body. As a result, even when the gap around the shaft between the drive shaft that rotates the roller body and the other configuration (for example, the reducer housing) is narrow, and the claw portion of the armband does not reach the core metal part of the roller body, A roller body (for example, cored bar portion + resin material roller portion) can be integrally and reliably extracted smoothly with a brace with a short claw portion that can be easily inserted into the narrow space. .

  The contact plate is formed such that a surface in contact with the roller body is formed such that a portion of the outer peripheral portion in contact with the roller portion is along the roller portion, and a surface in contact with the claw portion of the armband is a flat surface. Also good. In this way, the contact plate is in close contact with the roller body, and the pulling force that acts on the contact plate can be stably received by the entire roller body and can be extracted more smoothly.

  Further, the arm strap is formed in a gate shape with a connecting portion having a screw insertion portion for screwing the screw rod at a central portion, and an arm portion supported at both ends of the connecting portion and having the claw portion at the lower end. It may be formed. In this way, the armband can be formed in a simple gate structure, and the roller body can be removed by screwing the screw rod into the screw insertion part at the center of the connecting part. Therefore, it is possible to configure a sampling device that is easy and low in cost.

  On the other hand, a method for extracting a friction drive roller body according to the present invention is an extraction method using any one of the friction drive roller body extraction devices described above, wherein the claw portion of the armband is positioned on the lower surface of the roller body, Between the claw portion and the lower surface of the roller body, a caulking plate having an outer diameter capable of locking the claw portion of the armband is inserted, and the screw rod is screwed into the screw insertion portion of the armband, The roller body is integrally extracted through the contact plate at the claw portion by screwing the tip of the screw rod in contact with the rotary drive shaft. As a result, the claw portion of the armband is positioned on the lower surface of the roller body, the claw portion is locked to the contact plate on the lower surface of the roller body, and the screw rod is screwed into the screw insertion portion, whereby the tip of the screw rod is moved. When the screw rod is further screwed in from the state in contact with the rotation drive shaft, the roller body can be extracted integrally through the contact plate at the claw portion.

  According to the present invention, since the friction-driven roller body can be reliably and smoothly extracted, the roller body can be quickly and easily removed during maintenance and inspection.

It is a whole top view of the turntable rotated by the friction drive roller body extracted with the extraction apparatus which concerns on this invention. It is sectional drawing of the II-II arrow shown in FIG. It is an expansion perspective view of the drive device part of the turntable shown in FIG. (a) is a perspective view which shows the extraction operation | work of the friction drive roller body shown in FIG. 3, (b) is sectional drawing which shows the edge part of the friction drive roller body at the time of extraction operation. It is a longitudinal cross-sectional view which shows the state at the time of extraction operation | work of the friction drive roller body shown in FIG. (a)-(d) is a longitudinal cross-sectional view which shows the procedure of the extraction operation | work of the friction drive roller body shown in FIG. It is a longitudinal cross-sectional view which shows the state at the time of the extraction operation | work of the friction drive roller body by the conventional extraction tool. It is a longitudinal cross-sectional view which shows the state at the time of the extraction operation | work of the friction drive roller body by the other conventional extraction tool.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall plan view of a turntable rotated by a friction drive roller body that is extracted by the extraction device according to the present invention, FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. FIG. 2 is an enlarged perspective view of a drive device unit of the turntable shown in FIG. 1, showing a state where a lid of the drive unit is removed. In this embodiment, a turntable provided outside the entrance / exit of the parking apparatus will be described as an example, and a friction drive roller body that rotates the turntable with a rotary drive shaft arranged vertically will be described as an example.

  As shown in FIG. 1, this turntable 2 is provided outside the door 4 of the entrance / exit 3 of the parking device 1, and the vehicle M (FIG. 2) that has entered from the entrance / exit 3 at the time of delivery is The vehicle travels backward to the top of the turntable 2 and turns the turntable 2 by 180 ° to move forward to the outside road. This entry / exit operation is performed on the operation panel 5 provided on the side of the door 4.

  The turntable 2 includes a disk-shaped table body 11 and a driving device 6 that rotationally drives the table body 11. The table body 11 includes a frame 12 in which various shaped steels are assembled, a top plate 13 provided on the upper surface of the frame 12, and an annular rail 14 provided around the frame 12.

  As shown in FIG. 2, the table main body 11 is rotatably supported at the lower surface center portion (rotation center) by a support member 15 provided in a circular table pit P <b> 1 formed on the floor 7. A plurality of support rollers 16 that support the annular rail 14 when the table body 11 rotates are provided in the pits P <b> 1 positioned below the annular rail 14 provided around the table body 11. The drive unit 6 is provided in a rectangular drive unit pit P2 formed on the floor 7 so as to be continuous with the table pit P1, and the upper surface of the drive unit pit P2 is always on the floor 7. And a lid 8 that is flush with each other.

  As shown in FIG. 3, the drive device 6 includes a speed reducer 21 (for example, a worm speed reducer) and a drive motor 22 provided on one side of the speed reducer 21 fixed to a casing 23. The casing 23 is supported by a support shaft 26 of a support portion 25 provided on a base plate 24 fixed to the lower surface of the drive portion pit P2. The support shaft 26 is vertically arranged, and the casing 23 can swing in the horizontal direction around the support shaft 26.

  The speed reducer 21 is provided with a rotary drive shaft 51 protruding upward, and a friction drive roller body 52 is provided on the rotary drive shaft 51. The friction drive roller body 52 includes a cored bar portion 53 that is fitted to the rotary drive shaft 51 and a resin material roller unit 54 that is fixed to the outer peripheral surface of the cored bar portion 53. The friction drive roller body 52 is rotated at a predetermined rotation speed by the power of the drive motor 22 being decelerated by the speed reducer 21. The roller portion 54 is formed of a material suitable for friction driving, and may be a rubber material or the like.

  On the other hand, the casing 23 is provided with through holes 27 penetrating in the horizontal direction toward the table main body 11, and a guide rod 28 is inserted through the through holes 27. As shown in FIGS. 1 and 2, the base end of the guide rod 28 on the table body side is held by a holding shaft 30 of a holding portion 29 provided on the base plate 24, and the guide rod 28 is centered on the holding shaft 30. Thus, it can be rotated in the horizontal direction.

  A compression spring 31 is inserted on the side opposite to the holding member of the guide rod 28 so that one end of the guide rod 28 comes into contact with the casing 23. The compression spring 31 is provided between the casing 23 and a spring retainer 34 whose position is adjusted by an adjusting nut 33 screwed into a screw portion 32 formed at the tip of the guide rod 28. By means of the compression spring 31, the casing 23 is oscillated about the support shaft 26 and biased toward the table body 11 with respect to the guide rod 28 whose base end side is held by the base plate 24. Yes.

  By urging the casing 23 toward the table body 11 in this manner, the friction drive roller body 52 attached to the rotation drive shaft 51 of the speed reducer 21 fixed to the casing 23 is pressed against the table body 11. . The pressing force of the roller body 52 by the compression spring 31 increases when the spring retainer 34 is screwed with the adjusting nut 33, and decreases when loosened. Therefore, by adjusting the position of the spring retainer 34 with the adjusting nut 33, the urging force for pressing the roller body 52 against the table body 11 via the casing 23 swinging around the support shaft 26 can be adjusted. it can.

  These are the pressing urging mechanism 35, and the urging force that presses the friction drive roller body 52 against the table main body 11 by the pressing urging mechanism 35 is necessary for the friction driving roller body 52 to rotationally drive the table main body 11. The frictional force is adjusted so as to be generated between the annular rail 14.

  FIG. 4A is a perspective view showing the friction drive roller body extraction work shown in FIG. 3, and FIG. 4B is a cross-sectional view showing the end of the friction drive roller body during the extraction work. FIG. 5 is a longitudinal sectional view showing a state at the time of extracting the friction drive roller body shown in FIG.

  As shown in FIGS. 4 (a) and 5, in this embodiment, the extraction device 61 for the roller body 52 includes an integrally formed portal brace 62 and a central portion of the portal brace 62. The screw rod 71 is screwed into the provided screw insertion portion 63, and the contact plate 75 is inserted between the claw portion 64 of the gate-shaped armband 62 and the roller body 52.

  The portal arm 62 has a connecting portion 65 and an arm portion 66 integrally formed, and the connecting portion 65 is formed with a horizontal central portion and inclined toward the arm portion 66. The arm portion 66 is integrally formed at the end portion of the connecting portion 65. At the lower ends of the two arm portions 66 provided so as to face each other, a claw portion 64 is formed so as to face inward. A screw insertion portion 63 in which a female screw is formed is provided at the central portion of the connecting portion 65 of the portal brace 62.

  Further, the screw rod 71 is formed with a male screw that is screwed with a female screw formed in a screw insertion portion 63 formed in the vertical direction of the central portion of the armband 62. In this embodiment, since a jack bolt with a hexagon head 72 is employed for the screw rod 71, the screw rod 71 can be rotated by a tool 73 such as a spanner. The screw rod 71 may be, for example, a screw rod having a rotary lever or the like at the upper end in addition to the jack bolt with the hexagon head 72, and the configuration of the screw rod 71 is not limited to this embodiment.

  Further, the abutting plate 75 is formed with a diameter substantially the same as that of the roller body 52 to be extracted, and is a thin disk-like shape having a thickness that can be inserted between the claw portion 64 inserted into the narrow gap S and the roller body 52. Is formed. For example, as shown in FIG. 4B, the contact plate 75 is formed of a thin steel material, one surface (lower surface) is a flat surface, and the outer surface 76 is a roller portion on the other surface (upper surface) in contact with the roller body 52. 54 is formed so as to follow the shape of the lower edge of the outer peripheral portion 54 (for example, slightly raised in an inclined curved shape). In addition, a long hole 77 that is cut out in a straight line extending from the outer peripheral portion to the center portion is formed in the abutting plate 75, and has a predetermined gap from the rotation drive shaft 51 from the side of the roller body 52. It can be inserted between the roller body 52 and the claw portion 64. The elongated hole 77 is formed in such a size that it can be inserted into the roller body drop prevention collar 55 inserted into the rotary drive shaft 51 in a state having a predetermined gap.

  As shown in FIG. 5, when the friction drive roller body 52 is extracted by the extraction device 61, the contact plate 75 is applied to the lower surface of the friction drive roller body 52, and the portal brace is applied to the lower surface of the application plate 75. The nail | claw part 64 of 62 is hooked. At this time, even the short claw portion 64 that does not reach the narrow gap S due to the support mounting portion 56 of the speed reducer casing 57 around the rotation drive shaft 51 can be reliably locked by the contact plate 75. it can. If the screw rod 71 screwed into the screw insertion portion 63 of the portal brace 62 is screwed in, the lower end of the screw rod 71 is in contact with the upper end surface of the rotary drive shaft 51. Accordingly, the claw portion 64 of the arm clamp 62 relatively moves the friction drive roller body 52 upward together with the contact plate 75, so that the roller body 52 can be integrally removed from the rotation drive shaft 51 (two points). Chain line).

  6 (a) to 6 (d) are longitudinal sectional views showing the procedure for extracting the friction drive roller body shown in FIG. Based on these drawings, the extraction operation of the friction drive roller body 52 by the extraction device 61 of the above embodiment will be described below.

  As shown in FIG. 6 (a), the size relationship between the extraction device 61 and the friction drive roller body 52 is such that the inner dimension D2 of the two arm portions 66 provided so as to face each other is the object to be extracted. The inner end portion of the claw portion 64 formed inward so as to face the lower end portion of the arm portion 66 is formed larger than the diameter D1 of the roller body 52, and is larger than the diameter D1 of the roller body 52 to be extracted. It is getting smaller. Further, the outer diameter D3 of the contact plate 75 is the same diameter (or substantially the same diameter) as the outer diameter D1 of the friction drive roller body 52 (relationship of “D2> D1”, “D1 = D3”).

  Before using such a sampling device 61, first, as shown in FIG. 1, the cover 8 of the drive unit pit P2 is removed to remove the entire drive unit (drive motor 22, speed reducer 21, friction drive roller body 52). Etc.) are exposed.

  Then, as shown in FIG. 6 (b), the claw portion 64 of the portal brace 62 is positioned below the roller body 52, and the extraction device 61 is entirely disposed so that the portal brace 62 surrounds the roller body 52. Insert horizontally from the side. Following this operation, the screw rod 71 is screwed into the screw insertion portion 63 and turned in the screwing direction (the direction in which the arm rod 62 and the head 72 of the screw rod 71 approach each other). Thereby, the lower end of the screw rod 71 may be brought into contact with the upper end surface of the rotary drive shaft 51.

  Next, as shown in FIG. 6 (c), the pawl plate 64 is inserted between the claw portion 64 and the roller body 52 with both the claw portions 64 slightly separated from the lower surface of the roller body 52. The contact plate 75 is inserted in such a manner that the elongated hole 77 is moved along the rotational drive shaft 51 so that a predetermined gap is provided around the rotational drive shaft 51 and the central portion of the elongated hole 77 is positioned. Can be inserted. Then, by further screwing the screw rod 71 into the screw insertion portion 63 with the lower end of the screw rod 71 in contact with the upper end surface of the rotary drive shaft 51, the both claw portions 64 are locked to the lower surface of the abutting plate 75, and the roller body 52 is clamped by the two claw portions 64 with a backing plate 75 interposed on the lower surface.

  From this state, as shown in FIG. 6D, the lower end of the screw rod 71 (hexagonal bolt) 72 is screwed into the upper end surface of the rotary drive shaft 51 by screwing the head 72 (hexagon bolt) with an appropriate tool such as a spanner. The arm rod 62 is pulled up relatively with respect to the screw rod 71 rotated in the contact state. At this time, since the entire drawing of the roller body 52 (core metal portion 53 + roller portion 54) can be received by the contact plate 75, the entire roller body 52 is reliably integrated with the contact plate 75 from the rotary drive shaft 51. And it is extracted smoothly.

  As described above, according to the extraction device 61, the gap S between the friction drive roller body 52 having the roller portion 54 made of a resin material or the like and the speed reducer housing 57 is narrow, and the claw portion 64 of the gate-shaped armband 62. However, even when the roller body 52 does not reach the core metal portion 53, the roller body 52 can be reliably and smoothly removed with the short claw portion 64 that can be easily inserted into the narrow space.

  In the extraction device 61 of the above embodiment, the gate-shaped armband 62 integrally formed has been described as an example. However, the armband 62 separates the connecting portion 65 and the arm portion 66 from each other, for example. A lever opening / closing type connected by a link member or an arm-spacing adjustment type may be used, and the present invention is not limited to the above embodiment.

  Moreover, in the said embodiment, although the turntable 2 of the parking apparatus was demonstrated to the example, the friction drive type roller body 52 in the various field | areas used for another use can also be extracted similarly, and a turntable The friction drive roller body 52 is not limited to two.

  Furthermore, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The friction drive roller body extraction device according to the present invention can be used in a turntable drive device or the like that changes the direction of a vehicle entering and leaving the parking device.

1 Parking device
2 Turntable
6 Driving Device 11 Table Body 14 Annular Rail 21 Reducer 22 Drive Motor 23 Casing 26 Support Shaft 28 Guide Rod 31 Compression Spring 35 Pressing Energizing Mechanism 51 Rotating Drive Shaft 52 Friction Drive Roller Body 53 Core Bar 54 Roller 56 Supporting Installation Numeral 57 Reducer housing 61 Extraction device 62 Portal arm 63 Screw insertion portion 64 Claw portion 65 Connection portion 66 Arm portion 71 Screw rod 72 Head 75 Bump plate 76 Outer peripheral portion 77 Slot

Claims (4)

A drawing device for pulling out a roller body having a metal core part driven by a rotary drive shaft and a friction drive type roller part on the outer periphery of the metal core part from the rotary drive shaft,
A plurality of armbands having inwardly facing claw portions inserted into the lower surface of the roller body at the tip;
A screw rod whose tip is brought into contact with the upper surface of the rotary drive shaft in a state where the claw portion of the armband is inserted into the lower surface of the roller body;
A patch plate inserted between the claw portion of the armband and the lower surface of the roller body,
The armband has a screw insertion portion in which the distance from the claw portion is relatively changed by screwing the screw rod and screwing,
The abutting plate extends from the outer peripheral portion to the central portion and has a thickness that can be inserted between the claw portion of the armband and the lower surface of the roller body, and can be inserted with a predetermined gap from the rotational drive shaft. And a friction drive roller body extraction device having an outer diameter capable of engaging the claw portion of the armband with the lower surface of the roller body.   The surface of the contact plate that contacts the roller body is formed such that a portion of the outer peripheral portion that contacts the roller portion is along the roller portion, and a surface that contacts the claw portion of the armband is a flat surface. The friction drive roller body extraction device according to claim 1.   The armband is formed in a gate shape with a connecting portion having a screw insertion portion for screwing the screw rod at a central portion, and an arm portion supported at both ends of the connecting portion and having the claw portion at a lower end. The friction drive roller body extraction device according to claim 1 or 2. A friction drive roller body extraction method by the friction drive roller body extraction device according to any one of claims 1 to 3,
Positioning the claw portion of the armband on the lower surface of the roller body;
Between the claw portion and the lower surface of the roller body, insert a contact plate having an outer diameter capable of locking the claw portion of the armband,
The screw rod is screwed into the screw insertion portion of the armband, and the roller body is integrally removed through the contact plate at the claw portion by screwing the tip of the screw rod into contact with the rotary drive shaft. A method for extracting a friction drive roller body, characterized by:

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