JP2020196224A - Pressing device of rubber member - Google Patents

Abstract

To provide a rubber member pressing apparatus 2 that can contribute to stable manufacture of a high-quality tire.SOLUTION: A pressing device 2 includes two rollers 6, a roller head 10, and an actuator 12. The roller head 10 includes a swing unit 22 that swingably supports the two rollers 6, and two support units 24 located on both sides of the swing unit 22. The swing unit 22 includes a swing shaft 28 attached to the tip of a rod 16 of the actuator 12, and the support unit 24 includes an elastic body 40 and a rotating shaft 36 supported via the elastic body 40. The two rollers 6 swing along an arc centered on the swing shaft 28, and the roller 6 rotates about the rotation shaft 36.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rubber member pressing device.

Tires have many elements such as treads and sidewalls. In the manufacture of tires, unvulcanized rubber members are prepared as parts for these elements. This rubber member is wound around a drum of the molding machine and shaped into a desired shape. Then, by combining this rubber member with another rubber member, a tire in an unvulcanized state (hereinafter, also referred to as a raw tire) can be obtained.

In the manufacture of tires, for example, a rubber member is pressed by a roller in order to crimp one rubber member to another rubber member. An example of a pressing device having this roller is disclosed in Patent Document 1 below.

Japanese Unexamined Patent Publication No. 2-293911

In the above-mentioned pressing device, the roller is moved axially on the rubber member while rotating the drum. In the manufacture of tires, rubber members of various shapes are combined, so that the surface of the raw tire during molding includes steps and slopes. In particular, since the surface shape changes significantly in the stepped portion, it is not easy to move the roller while maintaining the force with which the roller presses the rubber member. With insufficient pressing, the rubber members may not be sufficiently crimped to each other. There is also a concern that the roller head on which this roller is set will be damaged by the vibration transmitted through the roller.

In order to stably manufacture high-quality tires, the rollers can be made to follow changes in the surface shape of the rubber members and the rubber members can be sufficiently crimped to each other regardless of the presence or absence of steps, and the vibration transmitted through the rollers can be transmitted. There is a need to establish technologies that can be mitigated.

The present invention has been made in view of such an actual situation, and an object of the present invention is to provide a rubber member pressing device that can contribute to stable production of a high-quality tire.

The rubber member pressing device according to one aspect of the present invention is a pressing device for pressing a rubber member containing unvulcanized rubber located on a cylindrical drum, and is arranged in the circumferential direction of the drum. It includes one roller, a roller head that supports the two rollers, and an actuator that moves the roller head toward the drum and presses the two rollers against the rubber member. The roller head includes a swing unit that rotatably supports the two rollers, two support units that are located on both sides of the swing unit and rotatably support the rollers, and the swing unit. , A frame that supports the two support units, and the like. The actuator comprises a rod movably supported towards the drum, the swing unit comprises a swing shaft attached to the tip of the rod, and the support unit is an elastic body and the elastic body. It is provided with a rotating shaft supported via. The two rollers swing along an arc centered on the swing shaft, and the rollers rotate around the rotation shaft.

Preferably, in the rubber member pressing device, the swing unit is fixed to the frame and includes a swing holder that supports the swing shaft.

Preferably, in the rubber member pressing device, the support unit is located on the drum side and is located on the support holder that supports the rotation shaft and on the outside of the support holder, and shock absorbing that accommodates the elastic body. It has a part and. The shock absorbing portion includes a first pedestal fixed to the support holder, a support shaft extending outward from the first pedestal, and a second pedestal fixed to the support shaft outside the first pedestal. A support shaft holder that movably holds the support shaft on the outside of the second pedestal, and a stopper that is attached to the end of the support shaft and prevents the support shaft from falling off from the support shaft holder are provided. The elastic body is located between the first pedestal and the second pedestal.

Preferably, in the rubber member pressing device, the elastic body is a coil spring, and the support shaft is passed inside the coil spring.

According to the rubber member pressing device of the present invention, the roller can be moved along the surface of the rubber member while maintaining the force for pressing the rubber member, so that the rubber members are sufficiently crimped to each other. .. Since the vibration transmitted through the roller is alleviated, damage is suppressed in the roller head in which this roller is set. This rubber member pressing device can contribute to the stable production of high-quality tires.

FIG. 1 is a schematic view showing a main part of a rubber member pressing device according to an embodiment of the present invention. FIG. 2 is a schematic view showing a main part of the roller head. FIG. 3 is an explanatory diagram illustrating the movement of the roller. FIG. 4 is an explanatory diagram illustrating another movement of the roller. FIG. 5 is an explanatory diagram illustrating the movement of the roller head of the pressing device.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

FIG. 1 shows an example of a rubber member pressing device 2 according to an embodiment of the present invention. The rubber member pressing device 2 (hereinafter referred to as the pressing device 2) is used to press the rubber member G containing unvulcanized rubber located on the cylindrical drum 4.

Although not described in detail, in the manufacture of a tire, a sheet-shaped, plate-shaped or strip-shaped rubber member G containing unvulcanized rubber is prepared as a component for elements such as a tread and a sidewall constituting the tire. .. The rubber member G is wound around the drum 4 and adjusted to a desired shape. Another rubber member G is combined with the rubber member G whose shape has been adjusted. By combining all the prepared rubber members G, a tire in an unvulcanized state, that is, a raw tire can be obtained. A tire is obtained by pressurizing and heating this raw tire in a mold (not shown).

In the present invention, not only a single rubber member but also a raw tire and a raw tire in the process of being molded in which a plurality of rubber members are combined are rubber members G containing unvulcanized rubber. ..

The unvulcanized rubber is a rubber composition obtained by mixing the base rubber and chemicals using a kneader such as a Banbury mixer. The base rubber includes natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR), isoprene rubber (IR), ethylene propylene rubber (EPDM), chloroprene rubber (CR), and acrylonitrile butadiene rubber (NBR). ) And butyl rubber (IIR) are exemplified. Chemicals include reinforcing agents such as carbon black and silica, plasticizers such as aromatic oils, fillers such as zinc oxide, lubricants such as stearic acid, antiaging agents, processing aids, sulfur and A vulcanization accelerator is exemplified. The selection of the base rubber and the chemicals, the content of the selected chemicals, etc. are appropriately determined according to the specifications of the components to which this rubber is applied.

The pressing device 2 and the drum 4 shown in FIG. 1 are a part of a molding machine that forms a raw tire by combining rubber members G. Although not described in detail, it has a well-known structure other than the pressing device 2 of this molding machine. In this molding machine, a supply means (not shown) supplies the rubber member G to the drum 4, and a rotating means (not shown) rotates the drum 4. In FIG. 1, the reference numeral PC is the rotation axis of the drum 4. The drum 4 rotates around the rotation axis PC. In FIG. 1, the arrow R is the rotation direction of the drum 4, in other words, the circumferential direction of the drum 4. In FIG. 1, the direction perpendicular to the paper surface is the axial direction of the drum 4.

As will be described later, in this molding machine, a tubular rubber member G (also referred to as a first cover G1) including a rubber member for the carcass and a tubular rubber member G including a rubber member for the tread. (Also referred to as the second cover G2) are combined.

The pressing device 2 includes two rollers 6. The two rollers 6 are arranged at positions facing the drum 4, and are arranged in the circumferential direction of the drum 4. The pressing device 2 is provided with two sets of roller groups 8 including two rollers 6. The two sets of roller groups 8 are arranged in parallel in the axial direction. FIG. 1 shows two rollers 6 forming one roller group 8.

In this pressing device 2, the two rollers 6 are supported by the roller head 10. In other words, the pressing device 2 includes a roller head 10 that supports two rollers 6. The pressing device 2 is provided with two sets of roller heads 10. The two sets of roller heads 10 are arranged in parallel in the axial direction. One roller head 10 is shown in FIG.

The pressing device 2 further includes an actuator 12. The actuator 12 moves the roller head 10 toward the drum 4, and presses the two rollers 6 supported by the roller head 10 against the rubber member G located on the drum 4. The pressing device 2 is provided with two sets of actuators 12. The two sets of actuators 12 are arranged in parallel in the axial direction. One actuator 12 is shown in FIG.

The actuator 12 includes a cylinder 14 and a rod 16. The cylinder 14 is supported by the frame 18 of the pressing device 2. The rod 16 is supported by the cylinder 14 so as to be movable toward the drum 4. In this pressing device 2, the moving direction of the rod 16 coincides with the radial direction of the drum 4. The actuator 12 is configured so that the rod 16 moves with respect to the cylinder 14 by compressed air. The actuator 12 is a commercially available pneumatic actuator.

In the molding machine having the pressing device 2, in order to combine the first cover G1 with the second cover G2, for example, the roller 6 axially moves on the second cover G2 by the moving means 20 while rotating the drum 4. Be moved. The pressing device 2 includes a moving means 20 for moving the roller 6 in the axial direction. Although not described in detail, the moving means 20 has a structure equivalent to that of the moving means in the conventional pressing device.

FIG. 2 shows a main part of the roller head 10. Although not shown in FIG. 2, the drum 4 is located on the left side of the paper, and the actuator 12 is located on the right side of the paper. In the present specification, the drum 4 side is also referred to as the inside, and the actuator 12 side is also referred to as the outside.

The roller head 10 includes a swing unit 22 and two support units 24. In the roller head 10, the swing unit 22 and the two support units 24 are supported by the frame 26 of the roller head 10. The roller head 10 further includes a frame 26 that supports the swing unit 22 and the pair of support units 24. In FIG. 2, for convenience of explanation, the frame 26 is shown by a chain double-dashed line.

The swing unit 22 includes a swing shaft 28. The swing shaft 28 is attached to the tip of the rod 16 of the actuator 12. In the pressing device 2, the roller head 10 can swing around the swing shaft 28 like a pendulum.

The swing unit 22 can include a ring-shaped swing holder 30. In this case, the swing holder 30 is fixed to the frame 26, and the swing shaft 28 is passed inside the swing holder 30. The swing holder 30 rotatably supports the swing shaft 28.

In the pressing device 2, the swing holder 30 only needs to be able to rotatably support the swing shaft 28, and its configuration is not particularly limited. As shown in FIG. 2, the swing holder 30 may be composed of a main body ring 32 fixed to the frame 26 and a bearing 34 fitted inside the main body ring 32. In this case, since the swing shaft 28 is supported by the main body ring 32 via the bearing 34, the roller head 10 can move smoothly.

As described above, the roller head 10 can swing around the swing shaft 28 like a pendulum. In this pressing device 2, since the two rollers 6 pressed against the rubber member G are supported by the roller head 10, these rollers 6 can also swing around the swing shaft 28 like a pendulum. In this pressing device 2, the swing unit 22 including the swing shaft 28 supports the two rollers 6 so as to be swingable.

FIG. 3 shows the movement of the two rollers 6 based on the swing unit 22. In FIG. 3, reference numeral PS is the axis of the swing shaft 28. The symbol PR is the center of the roller 6. This center PR is also the axis of the rotating shaft, which will be described later. The alternate long and short dash line LA is an arc centered on the axis PS of the rocking shaft 28 and passes through the center PR of the roller 6. In FIG. 3, the frame 26 is not shown for convenience of explanation.

In this pressing device 2, the locus of the center PR of the roller 6 when the roller head 10 swings around the swing shaft 28 is represented by an arc LA centered on the axis PS of the swing shaft 28. In this pressing device 2, the two rollers 6 supported by the roller head 10 swing along an arc PR centered on the swing shaft 28.

As shown in FIG. 2, the two support units 24 are located on both sides of the swing unit 22. Each of the two support units 24 supports one roller 6. In this pressing device 2, the support unit 24 includes a rotating shaft 36. The roller 6 is supported by the rotating shaft 36. The roller 6 rotates about the rotation shaft 36.

In this pressing device 2, the support unit 24 rotatably supports the roller 6. The support unit 24 is not particularly limited in the configuration for rotatably supporting the roller 6 as long as the roller 6 can be rotatably supported.

The support unit 24 includes a support holder 38 that supports the rotating shaft 36 on the drum 4 side. In this pressing device 2, the support holder 38 includes a main body 38a and a bearing 38b. In the support holder 38, the rotating shaft 36 is fixed to the main body 38a, and the roller 6 is attached to the rotating shaft 36 via the bearing 38b. A rotating shaft 36 may be fixed to the main body 38a via a bearing 38b, and a roller 6 may be attached to the rotating shaft 36.

The support unit 24 includes an elastic body 40. In the pressing device 2, the above-mentioned rotating shaft 36 is supported by the frame 26 of the roller head 10 via the elastic body 40.

In this pressing device 2, the elastic body 40 is an object having a property of being deformed when a load is applied and being restored when the load is removed. Examples of such an elastic body 40 include a coil spring.

In the support unit 24, the elastic body 40 is housed in the shock absorbing portion 42. The shock absorbing portion 42 is located outside the support holder 38. The support unit 24 is located outside the support holder 38 and includes a shock absorbing portion 42 that accommodates the elastic body 40.

The shock absorbing portion 42 includes a first pedestal 44, a support shaft 46, a second pedestal 48, a support shaft holder 50, and a stopper 52.

The first pedestal 44 has a disc shape. The first pedestal 44 is located outside the support holder 38 and is fixed to the support holder 38. The support shaft 46 is a round bar. The support shaft 46 extends outward from the first pedestal 44. The second pedestal 48 has a disc shape. The second pedestal 48 is fixed to the support shaft 46 outside the first pedestal 44. The second pedestal 48 is arranged at a distance from the first pedestal 44. In the shock absorbing portion 42, the elastic body 40 is located between the first pedestal 44 and the second pedestal 48. As shown in FIG. 2, when the elastic body 40 is a coil spring, it is preferable that the support shaft 46 is passed inside the coil spring between the first pedestal 44 and the second pedestal 48.

In the support unit 24, the support shaft 46 extends further outward from the second pedestal 48. The support shaft holder 50 movably supports the support shaft 46 on the outside of the second pedestal 48. In this pressing device 2, the support shaft holder 50 is fixed to the frame 26 of the roller head 10. A hole 54 is provided in the support shaft holder 50, and the support shaft 46 is passed through the hole 54. The stopper 52 has a disc shape and is attached to the end of the support shaft 46. As a result, the support shaft 46 is prevented from falling off from the support shaft holder 50.

FIG. 4 shows the movement of the roller 6 based on the elastic body 40 of the support unit 24. In FIG. 4, the frame 26 is not shown for convenience of explanation.

As described above, in the pressing device 2, the rotating shaft 36 to which the roller 6 is attached is supported via the elastic body 40. When a load acts on the elastic body 40, the elastic body 40 contracts. In this pressing device 2, when an outward load acts on the roller 6 located inside the elastic body 40, the elastic body 40 contracts and the roller 6 moves outward. When this load is removed, the elastic body 40 is restored, so that the roller 6 moves inward.

For example, as shown in FIG. 4, the frame 26 of the roller head 10 is provided with an elongated hole 56 through which the rotating shaft 36 is passed. Therefore, the rotating shaft 36 to which the roller 6 is attached moves along the elongated hole 56. In the pressing device 2, the moving direction of the rotating shaft 36 along the elongated hole 56 coincides with the extending direction of the supporting shaft 46. The range of motion of the rotating shaft 36 is adjusted by the push bolt 58 attached to the stopper 52 described above.

FIG. 5 shows an example of the operation of the pressing device 2. FIG. 5 shows the movement of the roller 6 when the second cover G2 is crimped to the first cover G1. In FIG. 5, the alternate long and short dash line CL is the center line of the raw tire being formed. The position of the center line CL corresponds to the position of the equatorial plane of the tire.

In this pressing device 2, when the second cover G2 is arranged around the first cover G1 located on the drum 4 by a supply means (not shown), air is filled inside the first cover G1. As a result, the central portion of the first cover G1 swells, and the first cover G1 comes into contact with the second cover G2 from the inside. By driving the actuator 12 and moving the rod 16 toward the drum 4, the two sets of roller heads 10 of the pressing device 2 are arranged at positions corresponding to the equatorial plane, as shown in FIG. 5A. Then, while rotating the drum 4, as shown in FIG. 5B, each roller head 10 is moved outward in the axial direction from the position corresponding to the equatorial plane by the moving means 20. The two rollers 6 of each roller head 10 press the second cover G2, and the second cover G2 crimps the first cover G1.

For example, the central portion of the second cover G2 is flat, but the end portion of the second cover G2 is tapered. Further, when this end portion is pressed against the first cover G1, a step is formed. The surface of the rubber member G with which the roller 6 comes into contact includes irregularities.

As described above, in this pressing device 2, the two rollers 6 can swing along the arc LA centered on the swing shaft 28. Therefore, the pressing device 2 can press the rubber member G with the two rollers 6 while making the two rollers 6 follow the surface shape of the rubber member G. Moreover, even if a peculiar load acts on the roller 6 due to the surface shape of the rubber member G, this load can be relaxed by swinging the roller 6. In this pressing device 2, the force with which the roller 6 presses the rubber member G can be appropriately maintained. The swing unit 22 including the swing shaft 28 contributes to sufficient crimping between the rubber members G.

As described above, in the pressing device 2, the rotating shaft 36 of the roller 6 is supported via the elastic body 40. In the pressing device 2, when the roller 6 presses the rubber member G, the elastic body 40 contracts due to this pressing, and the elastic body 40 generates a force (also referred to as a restoring force) that it tries to restore. To do. Therefore, even if the surface shape changes significantly like a step, the pressing device 2 can maintain the force with which the roller 6 presses the rubber member G. The pressing device 2 can sufficiently press the rubber member G with the roller 6 while making the roller 6 follow the surface shape of the rubber member G. The support unit 24 including the elastic body 40 contributes to sufficient crimping between the rubber members G.

In this pressing device 2, since the load is concentrated on the swing unit 22 including the swing shaft 28 attached to the tip of the rod 16, there is a concern that the swing unit 22 may be damaged. However, in this pressing device 2, the elastic body 40 of the support unit 24 effectively reduces the impact based on the vibration transmitted through the roller 6, so that the damage of the swing unit 22 is suppressed. The support unit 24 including the elastic body 40 improves the durability of the roller head 10 in which the roller 6 is set.

In this pressing device 2, the roller 6 can be moved along the surface of the rubber member G while maintaining the force with which the roller 6 presses the rubber member G, so that the rubber members G are sufficiently crimped to each other. Since the vibration transmitted through the roller 6 is alleviated, damage is suppressed in the roller head 10 in which the roller 6 is set. The pressing device 2 of the rubber member G can contribute to the stable production of high-quality tires.

In FIG. 2, the alternate long and short dash line L1 is the center line of the support shaft 46 provided on one of the support units 24. The center line L1 is a straight line that passes through the center PR of the roller 6 supported by the support unit 24 and extends in the extending direction of the support shaft 46. The alternate long and short dash line L2 is the center line of the support shaft 46 provided on the other support unit 24. The center line L2 is a straight line that passes through the center PR of the roller 6 supported by the support unit 24 and extends in the extending direction of the support shaft 46.

As shown in FIG. 2, in this pressing device 2, the distance between the center line L1 of one support shaft 46 and the center line L2 of the other support shaft 46 gradually decreases from the outside to the inside. Therefore, when the rubber member G is pressed by the two rollers 6, the force acting in the direction of increasing the distance between the two rollers 6 is effectively suppressed. Since the distance between the two rollers 6 is properly maintained, each roller 6 can follow the change in the surface shape of the rubber member G while appropriately maintaining the force for pressing the rubber member G. From this point of view, in this pressing device 2, it is preferable that the distance between the center line L1 of one support shaft 46 and the center line L2 of the other support shaft 46 gradually decreases from the outside to the inside.

In FIG. 2, reference numeral PD1 represents a contact position between the rubber member G wound around the drum 4 and one of the rollers 6. The solid line R1 is a straight line extending in the radial direction through the contact position PD1. This straight line R1 passes through the center PR of one of the rollers 6. Reference numeral PD2 represents a contact position between the rubber member G wound around the drum 4 and the other roller 6. The solid line R2 is a straight line extending in the radial direction through the contact position PD2. This straight line R2 passes through the center PR of the other roller 6. The intersection of the straight line R1 and the straight line R2 coincides with the center of the circle passing through the contact position PD1 and the contact position PD2, in other words, the center PC of the drum 4.

As shown in FIG. 2, in this pressing device 2, the distance between the straight line R1 and the straight line R2 gradually decreases from the outside to the inside. In particular, inside the center PR of the roller 6, the distance between the straight line R1 and the straight line R2 is narrower than the distance between the center line L1 of one support shaft 46 and the center line L2 of the other support shaft 46. Therefore, the distance from the center PR of the roller 6 to the intersection of the center line L1 of one support shaft 46 and the center line L2 of the other support shaft 46 is from the center PR of the roller 6 to the center PC of the drum 4. Longer than the distance. In this pressing device 2, when the rubber member G is pressed by the two rollers 6, the force acting in the direction of narrowing the distance between the two rollers 6 is effectively suppressed. Since the distance between the two rollers 6 is properly maintained, each roller 6 can follow the change in the surface shape of the rubber member G while appropriately maintaining the force for pressing the rubber member G. From this point of view, in this pressing device 2, the distance from the center PR of the roller 6 to the intersection of the center line L1 of one support shaft 46 and the center line L2 of the other support shaft 46 is from the center PR of the roller 6. It is more preferable that the distance to the center PC of the drum 4 is longer.

In this pressing device 2, when the angle formed by the center line L1 of one support shaft 46 and the center line L2 of the other support shaft 46 is an angle α, and the angle formed by the straight line R1 and the straight line R2 is an angle β, This angle α is smaller than the angle β, and the difference between the angle β and the angle α is preferably 2 ° or more, and preferably 6 ° or less. As a result, when the rubber member G is pressed by the two rollers 6, the distance between the two rollers 6 is appropriately maintained. Therefore, each roller 6 appropriately maintains the force of pressing the rubber member G. It can follow changes in the surface shape of the rubber member G. In this pressing device 2, the rubber members G are sufficiently crimped to each other. In this case, from the viewpoint that each roller 6 can follow the change in the surface shape of the rubber member G while maintaining the force for pressing the rubber member G more appropriately, in this pressing device 2, the center line of one of the support shafts 46 The angle α formed by L1 and the center line L2 of the other support shaft 46 is preferably 10 ° or more, and preferably 14 ° or less.

As described above, according to the present invention, a rubber member pressing device 2 that can contribute to the production of a high-quality tire can be obtained.

The embodiments disclosed this time are exemplary in all respects and are not restrictive. The technical scope of the present invention is not limited to the above-described embodiment, and the technical scope includes all modifications within a range equivalent to the configuration described in the claims.

The technique of pressing the rubber member described above can also be applied to the manufacture of various tires.

2 ... Pressing device 4 ... Drum 6 ... Roller 10 ... Roller head 12 ... Actuator 14 ... Cylinder 16 ... Rod 18 ... Pressing device 2 frame 22 ... Swing unit 24 ... Support unit 26 ... Frame of roller head 10 28 ... Swing shaft 36 ... Rotation shaft 38 ... Support holder 40 ... Elastic body 42 ... Shock absorber 44 ・ ・ ・ First pedestal 46 ・ ・ ・ Support shaft 48 ・ ・ ・ Second pedestal 50 ・ ・ ・ Support shaft holder 52 ・ ・ ・ Stopper 58 ・ ・ ・ Push bolt

Claims (4)

A pressing device for pressing a rubber member containing unvulcanized rubber located on a cylindrical drum.
Two rollers lined up in the circumferential direction of the drum,
An actuator that supports the two rollers, moves the roller head and the roller head toward the drum, and presses the two rollers against the rubber member.
With
The roller head includes a swing unit that rotatably supports the two rollers, two support units that are located on both sides of the swing unit and rotatably support the rollers, and the swing unit. , A frame that supports the two support units, and
The actuator comprises a rod that is movably supported towards the drum.
The swing unit includes a swing shaft attached to the tip of the rod.
The support unit includes an elastic body and a rotation shaft supported via the elastic body.
A rubber member pressing device in which the two rollers swing along an arc centered on the swing shaft, and the rollers rotate around the rotation shaft. The rubber member pressing device according to claim 1, wherein the swing unit is fixed to the frame and includes a swing holder that supports the swing shaft. The support unit is provided with a support holder located on the drum side and supporting the rotation shaft, and a shock absorbing portion located outside the support holder and accommodating the elastic body.
A first pedestal in which the shock absorbing portion is fixed to the support holder, a support shaft extending outward from the first pedestal, and a second pedestal fixed to the support shaft outside the first pedestal. A support shaft holder that movably holds the support shaft on the outside of the second pedestal and a stopper that is attached to the end of the support shaft and prevents the support shaft from falling off from the support shaft holder are provided.
The rubber member pressing device according to claim 1 or 2, wherein the elastic body is located between the first pedestal and the second pedestal. The elastic body is a coil spring.
The rubber member pressing device according to claim 3, wherein the support shaft is passed through the inside of the coil spring.

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