KR910007067Y1 - Nipper - Google Patents

Abstract

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Description

Nipper

1 is a schematic perspective view of a clamping apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic longitudinal sectional view of the gripping plate driving means of the gripping apparatus of FIG. 1, wherein the upper half shows the state before receiving the pressure fluid from the pressure fluid supply means, and the lower half shows the pressure fluid in the pressure fluid supply means. The figure which shows the state at the time of supply of.

FIG. 3 is an exploded perspective view showing only the fourth piston member, the fourth cylinder member, the end piston and the end cover of the sandwich plate driving means in order to show the configuration of the pressure fluid passage in the sandwich plate driving means of FIG.

FIG. 4 is a schematic longitudinal sectional view of the pressure regulating unit connected to the sandwich plate driving means of the sandwiching device of FIG.

5 is a perspective view of a joint member that is part of the main body of the pressure adjusting unit of FIG.

6 is an exploded perspective view of the adjustment ring and the spring receiving ring which are part of the rear case which is a part of the main body of the pressure adjusting unit of FIG.

7 is a schematic longitudinal sectional view of the fixing unit of the clamping device of FIG.

The present invention relates to a gripping device for gripping an object by a pair of gripping plates, and in particular, a gripping unit having a pair of gripping plates and a gripping plate driving means is placed on a base frame as a moving material, and thus the gripping plate is clamped. The improvement of intellect and the free change of the position which fixes a clamping unit on a base frame, etc. are related to the clamping apparatus which can be utilized using this fluid pressure.

In the conventional clamping apparatus which clamps an object by a pair of clamping plates, a pair of clamping plates are formed on the base frame by the folding movement control.

The pair of sandwich plates are formed at a position separated from each other on one lead screw shaft, and a pair of feed screws wound in the direction of the surface plate are screwed together, and the pair of sandwich plates is rotated by one lead screw side. Fold on the frame.

The gripping device as described above is used for fixing a workpiece on, for example, a bet of a machine tool.

Here, the gripping device is mounted on the bed with a moving material and fixed to the bed by bolts.

Such a gripping device cannot move a position of a pair of gripping plates on a base frame as it is by holding an object with a pair of gripping plates. Therefore, the clamping device described above is used in machine tools that cannot move the position of a person back, forth, or left and right with respect to the bet, for example, in a case of forming a hole in a plurality of positions of the workpiece. In order to change the position of drilling, the position of the clamping device on the bet must be shifted. To this end, the clamping device fixing bolts need to be released and tightened.

The clamping device fixing bolts are plural, and releasing and tightening the clamping device for each of the plurality of clamping device fixing bolts requires a lot of time and a lot of effort, thereby reducing processing efficiency. In addition, the machine tool which can move the position of a person to back and forth, and left and right relatively with respect to a bet, and can raise the processing efficiency in the process mentioned above is expensive.

In the above sandwiching device, the clamping of the workpiece is achieved only by the force applied to the pair of clamping plates on the lead screw shaft, so that the clamping is easy to be loosened due to the vibration generated in the workpiece during machining. It may cause a decrease in machining accuracy or dropping of the workpiece in the clamping device.

In particular, the latter is a major cause of human accidents.

The present invention has been made under circumstances, and the object of the present invention is to not only change the position to be fixed on the bevel of the machine tool as it is clamped by a pair of pincer plates, but also to the workpiece during machining. The loosening of the sandwiching does not occur due to the generated vibration, etc., thereby making it possible to reliably prevent the decrease in the machining accuracy and the falling of the workpiece from the sandwiching device, and the simple configuration allows the existing machine tool to be easily It can also be attached, it can provide a clamping device at a low price.

The purpose of the above-mentioned object is to provide a pair of clamping plates provided with a pair of clamping plates formed of a moving material so as to fold relatively on the base frame and the base frame, and a clamping plate driving means for driving the pair of clamping plates. And a holding unit connected to the holding unit and the holding unit having the holding plate driving means and fixing the holding unit at an arbitrary position on the base frame, wherein the holding unit and the holding unit each have the following configuration. This can be achieved by

Here, in the gripping unit, one gripping plate and a gripping plate driving means or the like are fixed, and the other gripping plate is driven by the gripping plate driving means so as to be folded with respect to one gripping plate so as to be relatively movable. It has a base member.

In addition, the gripping plate driving means has a lead screw side having one end fixed to the other gripping plate, and is formed in the subbase member so as to be a rotating material concentrically with the lead screw side, and has means for connecting the internal hole to the pressure fluid supply means. In the circumferential direction of the outer cylinder member and the outer cylinder member in the inner hole of the outer cylinder member, the inner cylinder member is rotated integrally with the outer cylinder member in a direction along the longitudinal center line of the outer cylinder member and is arranged to be relatively sliding with respect to the outer cylinder member. (Iii) The inner cylinder member and the inner cylinder of the outer cylinder member are arranged so as to be slidable relative to the outer cylinder member in a direction along the longitudinal center line of the outer cylinder member, and the pressure fluid supply means The lead screw shaft rotates inside the outer cylinder member under pressure by sliding in the inner cavity of the outer cylinder member. That has a piston and which drives the inner barrel member.

The base frame is formed with a through hole at a position opposite to the sub base member.

And the fixed unit comprises a casing having a surface area on the base frame positioned opposite to the surface area where the sandwich unit is disposed, the means being opposed to the through hole and connecting the inner hole to the pressure fluid supply means; And engaging rods arranged in the casing so as to be movable in the direction along the center line of the through hole and engaged in the through hole in the casing and engaging in the direction in which the sub base member and the sub base member of the gripping unit approach the base frame. A biasing means arranged to bias the engaging rod in a direction engaged with the sub-base member of the sandwiching unit, and disposed in the casing, and resisting the biasing force of the biasing means by receiving the pressure of the fluid supplied into the casing by the hydraulic fluid supply means. How to release the engagement rod from the secondary base member of the sandwich unit That will have the diamond hurem (dirphragm) member for pressing on.

In the clamping device according to the present invention characterized by the above-described configuration, the clamping plate driving means preferably has a pressure adjusting unit for controlling the magnitude of the pressure supplied into the inner cavity of the outer cylinder member from the pressure fluid supply means.

With such a configuration, the clamping force generated by the pinch plate driving means can be freely set by the pressure of the pressure fluid supplied in the inner hole of the outer cylinder member from the pressure fluid supply means.

When the clamping device according to the present invention has a pressure adjusting unit, the pressure adjusting unit is connected to the outer cylinder member, and connects the fluid passage and the fluid passage communicating with the pressure fluid supply means connecting means of the outer cylinder member to the pressure fluid supply means. A main body having a means, a toilet seat formed in the flow passage, a toilet body disposed between the toilet seat seated on the toilet seat in the fluid passage and an open position away from the toilet seat, and a first position and a second position in the fluid passage. It is a movable material between and, permits the arrangement of the deformed body in the closed position in the first position, drives the deformed body in the open position in accordance with the movement from the first position to the second position, and the pressure fluid in the fluid passage Actuator member and the actuator member formed in the main body are urged to the second position against the pressure of the pressure fluid in the fluid passage under pressure. It is desirable to have a taxing means and an auxiliary force adjusting means formed on the main body so as to be exposed to the outer surface of the main body to adjust the taxing force for generating the taxing means.

This configuration is simple and can be miniaturized.

It will be described below in accordance with the drawings.

Figure 2 schematically shows the appearance of the sandwiching device according to the first embodiment of the present invention.

The clamping device is fixed to the base frame 10 by fixing bolts on the beets of the machine tools, such as a ball not shown. At the top of the base frame is placed a gripping unit 18 having a pair of gripping plates 12, 14 and a gripping plate driving means 16 for driving them.

The pinching unit 18 has a subbase member 20 mounted on the base frame 10 at the same time that the first pincer plate 12 is fixed, and a second base member 20 is a folding material with respect to the first pinplate 14 on the subbase member 20th. Is placed on the board.

One end of the lead screw side 22 of the holding plate driving means 16 is fixed to the second holding plate 14, and the lead screw shaft 22 is the holding plate driving means 16 formed on the secondary base member 20 concentrically with the lead screw shaft 22. Protrude from the outer cylinder member 24.

The rotation of the outer cylinder member 24 here causes the lead screw shaft 22 to advance or retract, further generating the second folding plate 14 folds relative to the first sandwich plate 12.

The outer cylinder member 24 is connected with a pressure fluid supply means 28 via a pressure adjusting unit 26. In this embodiment, the pressure fluid supply means 28 is a complex.

The lead screw shaft 22 is also able to move forward and backward slightly with respect to the outer cylinder member 24 irrespective of the rotation of the outer cylinder member 24, and the pressure fluid supplied to the inside of the outer cylinder member 24 from the pressure fluid supply means 28, that is, the compressed air is the outer cylinder member. Applies to lead screw shaft 22 to generate a relative advance of lead screw shaft 22 relative to 24.

This pressure fluid action reinforces the clamping force of the workpiece by the first gripping plate 12, the second gripping plate 14, and the like, which is achieved by the rotation of the outer cylinder member 24, and the first gripping plate 14, the second gripping plate 14, and the like. To tighten the tightening of the workpiece.

The up force adjusting unit 26 keeps the pressure of the input oil supplied from the pressure fluid supply means 28 toward the inside of the outer cylinder member 24 at the same time, and the rotation of the adjusting ring 30 on the outer circumferential surface enables arbitrary setting of the pressure.

On the lower surface side of the base frame 10, a fixing unit 32 is arranged to be connected to the sub base member 20 through a through hole formed in the base frame 10 to fix the sub base member 20 to an arbitrary position on the upper surface of the base frame 10.

The fixed unit 32 is connected to the pressure fluid supply means 28 through the switching valve 34. When the switching valve 34 is set to open and the fixed unit 32 and the pressure fluid are supplied from the input fluid supply means 28, the fixed unit 32 is When the subbase member 20 is released from the base frame 10, the switching valve 34 is set, and the supply of pressure fluid to the fixed unit 32 is stopped by the pressure fluid supply means 28, the fixed unit 32 is positioned on the subbase member 10 above the frame 10. Secure 20.

The sub base member 20 which has been released in the base frame 10 can be freely changed in the base frame 10.

2 is a cross-sectional view showing the state of the gripping plate driving means 16 of the gripping unit 1. FIG.

In the longitudinal section of the outer member 24 shown in the same figure, the upper half indicates the state before the compressed air is supplied to the inside of the outer cylinder member 24, and the lower end indicates the compressed air is supplied to the inner cylinder member 24. The status is displayed.

As shown in detail in the figure, the second clamping plate 14 is screwed to the left end of the lead screw shaft 22.

The outer cylinder member 24 is fixed to the large diameter portion of the normal housing block 36 with the jaw, and the small diameter portion of the conventional housing block 36 with the jaw rotates concentrically with the lead screw shaft 22 on the holder member 38 fixed on the secondary base member 20. It is supported to restrain.

The small diameter portion projecting from the holder member 38 on the second clamping plate side is fitted with a stop ring 40, and the stop ring 40 abuts against the end face of the holder member 38 on the second clamping plate side so that the jaw at the holder member 38 is closed. The fall of the normal housing block 36 is prevented.

In the inner hole of the ordinary housing block 36 with a jaw, the inner cylinder member 42, which is combined with a lead screw shaft 22, is accommodated as sliding material, and the center line of the inner hole is placed on the inner circumferential surface of the inner hole of the conventional housing block 36 with a jaw on the outer circumferential surface of the inner cylinder member 42. The key 46 accommodated as the sliding material is fixed to the key groove 44 formed by directing in the direction.

The key 46 engages with the key groove 44 in the circumferential direction to generate an integral rotation of the inner cylinder member 42 with the outer cylinder member 24, thereby generating the forward and backward movement of the lead screw shaft 22 of the rotation of the inner cylinder member 42.

In addition, the key 46 slides the center line with respect to the key groove 44 in the other direction, thereby enabling the forward and backward movement of the inner cylinder member 42 and the lead screw shaft 22 integrally.

In the inner hole of the outer cylinder member 24, the piston 48 and the piston 48 for generating an integral forward and backward movement between the inner cylinder member 42 and the lead screw shaft 22 are housed with a cylinder 50 for wet contact.

The cylinder 50 is composed of four members 50A, 50B, 50C, and 50D having the same configuration on each other arranged in a direction perpendicular to the center line, and each of the four members 50A, 50B, 50C, and 50D is formed of the outer cylinder member 24. It consists of the thin outer peripheral part 52 comprised in the inner peripheral surface of an inner hole, and the inner flange part 54 etc. which protruded radially inward from the inner surface of the inner cylinder member side of the thin outer peripheral part 52. As shown in FIG.

The piston 48 is also composed of four members 48A, 48B, 48C, and 48D of the same configuration arranged in series in the direction along the center line, and each of the four members 48A, 48B, 48C, and 48D has four cylinders of 50. Normal inner circumferential portion 56 inserted into the protruding section of each inner flange portion 54 of members 50A, 50B, 50C, and 50D by sliding material, and outer flange protruding radially outward from the outer surface of the inner cylinder member side of inner circumferential portion 56 It consists of part 58.

The protruding cross section of each outer side flange portion 58 of the second to fourth members 48A, 48B, 48C, and 48D of the piston 8 slides on the inner circumferential surface of each of the thin outer peripheral portions 52 of the first to third members 50A, 50B, and 50C of the cylinder 50. It consists of a material, and only the protruding section of the outer flange portion 58 of the first member 48A of the piston 48 is composed of sliding material at the outer end portion of the inner circumference of the inner hole of the inner housing of the normal housing block 36 with a jaw.

Each inner hole of the four members 48A, 48B, 48C, and 48D of the piston 48 has a diameter slightly larger than the outer diameter of the lead screw shaft 22, and each of the inner holes of the four members 48A, 48B, 48C, and 48D is In the inner hole 60, an end portion of the lead screw shaft 22 protruding from the inner cylinder member 42 into the outer cylinder member 24 is inserted.

On the inner circumferential surface of the thin outer peripheral portion 52 of the fourth member 50D of the cylinder 50, the main surface of the disc-shaped end piston 62 is made of sliding material, and the end piston 62 abuts on the free end surface of the ordinary inner circumferential portion 56 of the fourth member 48D of the piston 48. On both sides of the inner periphery 56, there are formed projections 64 made of sliding material.

The outer circumferential surface of the end cover 66 is formed at the end of the inner circumferential surface of the inner hole of the outer member 24 and the outer circumferential surface of the end cover 66 is formed, and the polar region of the inner face of the end cover 66 is formed on the free end face of the thin outer peripheral portion 52 of the fourth member 90D of the cylinder 50. You are facing.

The end cover 66 is fixed to the inner circumferential surface of the inner hole of the outer member 24 by the stop ring 68, whereby the four members 50A, 50B, 50C, 50D of the cylinder 50 have the end face and the end face of the outer cylinder of the conventional housing block 36 fed. It is clamped by the inner surface 66 and fixed in the inner hole of the outer cylinder member 24.

A compression coil spring 70 is provided at the end of the inner cylinder member 42 of the inner cylinder member, and the spring coil and the outer cylinder member side of the inner cylinder member 42 are formed at the end of the outer cylinder member side of the conventional housing block 36 with both ends thereof. The inner cylinder member 42 urges the piston 48 and end piston 62 toward the end cover 66 of the outer cylinder member 24.

The end cover 66 is provided with a connecting hole 72 in which the exit of the eye adjustment unit 26 is hermetically sealed.

Pressure fluid for acting on the four members 48A, 48B, 48C, and 48D of the piston 48 to the pressure fluid supplied from the pressure fluid supply means 28 to the inside of the outer cylinder member 24 of the pincer plate driving means 16 through the pressure adjusting unit 26. A passage is formed in the inner surface of the end cover 66 and the outer peripheral surface of each of the thin outer peripheral portions 52 of the four members 48A, 48B, 48C, and 48D of the cylinder 50 and the side surface on the inner cylinder member side.

In more detail with respect to the pressure fluid passage, as shown in detail in FIG. 3, the inner surface of the end cover 66 is formed concentrically stepped with axial protrusions 74 and 76 having a diameter smaller than its maximum diameter. Radial grooves 78 extending in the radial direction are formed in the axial protrusions 74 and 76.

On the outer circumferential surface of each of the four members 48A, 48B, 48C, and 48D of the cylinder 50, a chamfer 80 directed in the direction along the longitudinal center line of the cylinder 50 is formed. The axial protrusions 82 and 84 having a diameter smaller than the maximum diameter are concentrically formed stepwise on the side surface thereof, and the radially extending grooves 86 are formed in the axial protrusion 84 located outside.

The pressure fluid supplied from the pressure fluid supply means 28 to the inside of the outer cylinder member 24 of the pinch plate driving means 16 acts on the side of the end cover shaft of the end piston 62 and is located outward through the radial groove 78 of the end cover 66. It is led to the space between the outer circumferential surface of the directional protrusion 76 and the inner circumferential surface of the inner hole of the outer cylinder member 24.

The compressed fluid in this space is axially projected 84 located at each outer side through each chamfer 80 of the axial protrusion 84 located at each outside through the four chamfers 80 of the four members 50A, 50B, 50C, 50D of the cylinder 50. Of the four members 48A of the piston 48, each of which is directed to the space between the outer circumferential surface of the outer cylinder member and the inner circumferential surface of the inner hole of the outer cylinder member 24, from which the protruding section of the axial protrusion 84 located outwardly through the radial groove 86 To the space between the side of the outer flange portion 58 of the outer flange portion 58 of the outer flange portion 58, 48B, 48C, 48D, where the side of the end cover portion of the outer flange portion 58 of the four members 48A, 48B, 48C, 48D respectively correspond Piston 48, which is induced in the space between and acts on the outer flange 58 of the four members 48A, 48B, 48C, and 48D, respectively corresponding to each other, is a biasing force of the compression coil spring 70, like the end piston 62. Inner tube against The ash 42 and the lead screw shaft 22 are moved to protrude from the outer cylinder member 24.

In the outer circumferential surface of the housing block 36, which has a jaw, the portion where the inner circumferential surface of the outer cylinder member 24 is screwed together and the outer circumferential surface of the end cover 66 are prevented from leaking compressed fluid in the gap between these portions and the outer circumferential surface and the inner circumferential surface of the outer cylinder member 24. To prevent this, 0 rings 88 and 90 are mounted respectively.

On the outer circumferential surface of each of the outer flange portions 58 of the four members 48A, 48B, 48C, and 48D of the piston 48 and the outer circumferential surface of the end piston 62, the thin outer peripheral portions of the four members 50A, 50B, 50C, and 50D of the cylinder 50 to be wetted, respectively. Piston packings 92, such as rings, are respectively mounted to prevent leakage of compressed fluid in the gap between the inner circumferential surface of 52 and the outer circumferential member side end of the inner circumferential surface of the normal housing block 36 with a jaw.

On the side surface of the inner cylinder member side of each of the outer flange portions 58 of the second to fourth members 48A, 48B, 48C, and 48D of the piston 48, from the position outside the outer circumference of the inner circumference 56 to the inner circumference of the ordinary inner circumference 56 A vented exhaust groove 94 is formed, which extends from the position on the side of the inner cylinder member side of the end piston 62 to the side of the inner cylinder member side of the protrusion 6 at a position outside the radius of the outer peripheral surface of the normal inner peripheral portion 56 of the fourth member 48D of the piston 48. The produced exhaust grooves 96 are formed.

These exhaust grooves 94 and 96 are compressed fluid supplied from the extruded fluid supply means, so that the piston 48, like the end piston 2, resists the negative force of the compression coil spring 70, so that the inner cylinder member 42 and the lead screw shaft 22 are the outer cylinder member 24. When moving so as to protrude from the second to fourth members 48B, 48C, 48D of the piston 48 and the inner side of the inner cylinder portion of the end piston 62 and the first to fourth members 50A, 50B of the cylinder 50, Air is discharged from the gap (see the upper half of Fig. 2) between the side surfaces of the end cover portions of the inner flange portions 54 of 50C and 50D, respectively, so as not to disturb the above-described movement of the piston 48.

On the contrary, the supply of the pressurized fluid from the pressurized fluid supply means stops, so that the piston 48 and the end piston 62 move the lead screw shaft 22, like the inner cylinder member 42, by the force of the compression coil spring 70. When moving to draw into the interior of 24, it allows the inflow of air into the above-mentioned gap (see upper half of FIG. 2) and does not interfere with the above-described movement of the piston 48.

When the workpiece is clamped between the pair of sandwich plates 12 and 14 by using the sandwich plate driving means 16 configured as described above, first, between the pair of sandwich plates 12 and 14 in terms of the trademark of the subbase member 20, The work piece is placed on the workpiece, and then the outer cylinder member 24 is rotated so that the lead screw shaft 22 protrudes from the outer cylinder member 24, thereby accessing a pair of nip plates 12 and 14, resulting in a pair of nip plates 12 and 14. Lightly contact the workpiece.

Thereafter, it is not necessary to rotate the outer cylinder member 24 again in order to increase the clamping force of the work pieces by the pair of sandwich plates 12 and 14.

Next, the pressure adjusting unit 26 is operated to introduce the pressure fluid even in the inner cavity of the outer cylinder member 24 by the pressure fluid supply means 28.

As a result, the pressure of the pressure fluid loaded on the piston 48 is also transmitted to the second clamping plate 14 through the inner cylinder member 42, the lead screw shaft 22, and the like, which increases the clamping force.

To release the workpiece by the pair of gripping plates 12 and 14, the pressure adjusting unit 26 is operated to stop the introduction of the pressure fluid into the inner hole of the outer cylinder member 24 by the pressure fluid supply means 28 and at the same time, the outer cylinder member 24. To interlock the ball with the atmosphere.

As a result, the clamping force applied to the workpiece in the pair of gripping plates 12 and 14 is eliminated, and the pair of grating plates 12 and 14 are merely in contact with the workpiece. The workpiece can be easily removed in between.

In addition, if necessary, the outer cylinder member 24 may be rotated so that the lead screw shaft 22 enters the outer cylinder member 24 so that the pair of sandwich plates 12 and 14 are separated from each other.

According to the gripping plate driving means 16 described above, regardless of the size of the tightening torque applied to the outer cylinder member 24, the work can be always held by a constant gripping plate by the pair of gripping plates 12 and 14.

In addition, the clamping force is applied to the end face of the end piston 62 and the outer flange portion 58 of each of the outer members 48A, 48B, 48C, and 48D of the four members 48A, 48B, 48C, and 48D of the piston 48 in a pressure fluid. It is the sum total of the pressures, which is very strong in the clamping force generated by the tightening torque of the outer cylinder member 24.

In addition, even if a gap is generated between the workpiece placed on the secondary base member 20 and the first and second gripping plates 12 and 14, the total distance of the gaps is the piston for the outer cylinder member 24 and the cylinder 50 shown in FIG. If it is slightly smaller than the relative maximum travel distance S of 48, the pair of gripping plates 12 and 14 can always clamp the workpiece with a constant clamping force.

4 shows the longitudinal section of the pressure adjusting unit 26.

The pressure regulating unit 26 has a joint member 98 which is hermetically screwed into the connecting hole 72 of the end cover 66 of the pinch plate driving means 16.

On the outer circumferential surface of the joint member 98, a normal front case 100 with a jaw is covered with a rotating material. On the inner circumferential surface of the front case 100, a normal rear case 102 with a chin is combined to integrally form the front case 100. Are combined.

The joint member 98 is formed with a fluid passage 104 which generally directs the long longitudinal centerline of the nip plate driving means 16 in another direction, and one end of the fluid passage 104 is joined to the connection hole 72 of the end cover 66 of the nip plate driving means 16. Is opened in the outer cylinder member 24, and the other end is opened in the other end surface of the joint member 98 far from the end cover 66.

The fluid passage 104 is bent to produce a radial direction between one end and the other end, and a conical toilet seat 106 facing the one end side is formed in the radial direction portion.

The toilet seat 106 is seated with a spherical variant 107.

A through hole extending to the outer circumferential surface of the joint member 98 is formed in a portion of the inner surface of the fluid passage 104 facing the toilet seat 106. The through hole has a bottom wall in a state in which the bottom wall is radially disposed outward. Infiltrated. In the bottom wall of the foot 108, an opening is formed in which rod-shaped slide 110 is inserted into the sliding material in the radial direction.

The slide 110 has an outer flange 112 facing the radially inner end surface of the bottom wall of the foot 108, and a compression coil spring 114 abutting both ends between the outer flange 112 and the deformable body 107 is disposed.

0 ring 116 is attached to the outer peripheral surface of the sliding member 110 adjacent to the low force side of the finger 108 of the outer flange 112, and the 0 ring 116 is attached to the radially inner end surface of the bottom wall of the foot 108 by the force of the compression coil spring 114. It is pressed and the deformed body 107 is pressed in the toilet seat 106th position.

The cushion member 118 is fixed to the inner end surface of the sliding member 110 which is located outside of the deformable body 107 in the outer diameter direction.

On the inner circumferential surface of the front case 100, a hop cam 120 is formed in the circumferential direction at the position facing the bottom wall of the foot 108. The groove cam 120 has an outer end portion in the radial direction of the slide 110 protruding from the outer circumferential surface of the joint member 98. Is inserted and abuts on the bottom surface of the groove cam 120.

The groove cam 120 is a cam surface whose lower surface is a rounded portion eccentric with respect to the longitudinal center line of the front case 100, as shown in particular in FIG. 5, and the exhaust surface 122 extends to the outer circumferential surface of the front case 100 on the lower surface. Is formed.

In FIG. 4, the sliding member 110 is arrange | positioned in the deeper position on the low surface of the home cam 120. FIG.

Here, the cushioning member 118 of the inner end face of the sliding member 110 is radially outward from the deformable body 107, and the 0-ring 116 press-fitted into the radial inner end face of the bottom wall of the foot 108 is the flow of fluid in the exhaust hole 122. Is blocking.

When the pressure fluid is supplied from the pressure fluid supply means 28 to the opening on the rear case side of the fluid passage 104, the pressure relief fluid 107 is separated from the toilet seat 106 against the bias force of the compression coil spring 114 by the pressure of the pressure fluid, and is pinched at the toilet seat 106. The plate drive means side allows the flow of pressure fluid towards the end.

Falling of the deflection 107 at the toilet seat 106 causes an increase in the force for pressing the 0 ring 116 by the compression coil spring 114 to the radially inner end surface of the bottom wall of the foot 108, and the through and exhaust holes 122 of the bottom wall of the foot 108 This ensures that the pressure fluid in the atmosphere in the fluid passage 104 is prevented from leaking.

If the outer protrusion of the slider 110 is rotated around the joint member 98 until the lower surface of the groove cam 120 is disposed at a shallower position, the slider 110 may be subjected to the pressure of the pressure fluid loaded on the deformable body 107. The compression coil spring 70 moves radially inwardly against the bias force of the compression coil spring 70, and abuts the cushion member 118 on the deflector 107 to press the deformed body 107 onto the toilet seat 106.

As a result, the flow of the pressure fluid from the pressure fluid supply means 28 is blocked at the toilet seat 106, and the force fluid in the outer cylinder 24 of the pincer plate driving means 16 is discharged into the apparatus through the through-holes and exhaust holes 122 in the bottom wall of the push 108. As a result, it becomes equal to the atmospheric pressure of the pressure in the outer cylinder 24.

In the radially extending region of the inner surface of the front case 100, an arc-shaped groove 124 directed in the circumferential direction is formed, as shown in detail in FIG. 5, and in the circumferential direction of the lower surface of the arc-shaped groove 124. At both ends of the lock, locks 126 and 128 are formed.

In the radially extending area of the outer surface of the joint member 98, a lock ball receiving hole 130 is formed at a position facing the arc groove 125 of the front case 100, and the lock ball 132 and the lock ball 132 are outside in the receiving hole 130. Compression coil springs 134, etc.

When the front case 100 is rotated relative to the joint member 98, the lock ball 132 contacts the lower surface of the groove 124 on the arc and contacts the two end surfaces in the circumferential direction of the groove 124 on the arc. Seated at 126, 128. Here, when the lock ball 132 of the joint member 98 is seated on the one-side lock pin 126 of the arcuate groove 124 of the front case 100, the outer protruding end of the slid 110 is disposed at a shallower position on the lower surface of the home cam 120. As can be seen, the pressure in the outer cylinder 24 is equal to atmospheric pressure.

When the lock ball 132 is seated on the other lock pin 128, the outer protruding end of the slider 110 is disposed at a position deeper at the lower surface of the home cam 120, so that the pressure fluid supply means 28 in the outer cylinder 24 as described above. Pressure fluid is supplied.

As shown in FIG. 4, at the rear end surface of the rear case 102, the nipole members 136 are hermetically screwed together.

The nipole member 136 is provided with a connecting hole 140 which is opened in the outer end face and the tip end of the pressure fluid supply hose 138 in the pressure fluid supply means 28 is hermetically screwed together, and a change receiving hole 142 which opens in the inner end face and communicates with the connecting hole 140. It is.

On the outer circumferential surface of the nipple member 136, a cap 144 is screwed to cover the inner end surface of the nipple member 136 in the region of the inner hole of the rear case 102, and the through hole 146 is formed in the deformable accommodation hole 142 in the cap 144.

A cylindrical cup-shaped variant 148 is accommodated in the variant receiving hole 142. A press-fit pin 150 formed on the bottom wall of the variant 148 penetrates into the through hole 146 of the cap 144, protruding from the through hole 146 into the inner case of the rear case 102. have.

Each inner circumferential surface of the deformable receiving hole 142 and the through hole 146 is formed with a plurality of radial ribs 152, 154 that protrude radially inwardly and extend in a direction along the longitudinal center line. The outer peripheral surfaces of the variants 148 and the press-fit pin 150 are abutted so as to allow sliding in the axial direction of the protruding end face variants 148 and 152 of the 152 and 154.

On the outer circumferential surface of the press-fit pin 150, an annular packing 156 is mounted adjacent to the bottom wall of the deformable body 148. The deformable body 148 is biased toward the through hole 146 by the compression coil spring 158 accommodated in the deformable receiving hole 142. The packing 156 of the biased variant 148 abuts the area around the through hole of the bottom wall of the cap 144 and closes the through hole 146.

Thus, the area around the through hole of the bottom wall of the cap 144 functions as the toilet seat 160 for the deformable body 148.

The through hole 146 communicates with the fluid passage 104 of the joint member 98 through the inner hole of the rear case 102. The through hole 146 is connected to the joint member 98, the front case 100, the rear case 102, and the nipple member 136 like the fluid passage 104 and the change receiving hole 142. In the main body of the pressure adjusting unit 26 constituted by the pressure adjusting unit 26, a fluid passage for guiding the pressure fluid supplied from the pressure fluid supply means 28 to the connecting hole 140 to the end of the end case side of the fluid passage 104 is constituted.

In the inner cavity of the rear case 102, the outer circumferential surface of the cap 144 is covered with a sliding cup material actuator member 164 through the 0 ring 162 mounted on the outer circumferential surface, the fluid wall of the joint member 98 on the bottom wall of the actuator member 164 A protruding portion 166 protruding in the rear case side opening 104 is formed. The inner circumferential surface of the rear case side opening of the fluid passage 104 is also provided with a zero ring 168 to be in contact with the outer circumferential surface of the projection 166. The protruding end of the press-fit pin 150 of the variant 148 abuts on the cap side end face of the bottom wall of the actuator member 164, and the protruding end 166 protrudes from the bottom wall cap side end end to the opening in the rear case side of the fluid passage 104 around the contact position. A plurality of through-holes 170 are formed.

In the inner hole of the rear case 102, there is also accommodated a spring male ring 172 configured to be sliding material with respect to the inner circumferential surface of the rear case 102.

The inner diameter of the spring male ring 172 is larger than the outer diameter of the circumferential wall of the actuator member 164, and the spring male ring 172 is adjacent to the joint member 98.

The outer circumferential surface of the actuator member 164 is provided with a compression coil spring 174.

One end of the compression coil spring 174 is in contact with the outer flange formed on the nipple member side end of the outer peripheral surface of the actuator member 164, and the other end is in contact with the spring male ring 172.

An annular guide groove 178 is formed on the outer circumferential surface of the rear case 102 adjacent to the threaded portion 176 for mating with the front case 100, and at two positions located in the radial direction on the outer circumferential wall of the rear case 102, the guide groove is located at the cross section of the threaded side. From the screw part 176 of 178, a pair of guide notches 180 and 182 formed along the longitudinal centerline to the far end cross section are formed.

In the pair of guide groove cutouts 180 and 182, a pair of outer projections 184 and 186 formed on the outer circumferential surface of the spring male ring 172 are inserted into sliding materials in the direction along the longitudinal center line, and one outer projection 184 is provided. The screw portion 176 is fixed to the indicator needle 186 protruding in the direction along the longitudinal center line from the cross section of the far hole.

The indicator needle 186 is inserted into the long directional hole 188 formed in the cross section of the far end in the threaded portion 176 of the guide groove 178, and the long directional hole 188 is formed farther from the threaded portion 176 than the guide groove 178 on the outer circumferential surface of the rear case 102. Up to 190 graduated graduations.

The outer ends of the pair of outer projections 184, 186 of the spring male ring 172 are formed in a concentric round part with the spring male ring 172, and these outer surfaces have a threaded portion 192 which is a part of the same screw as the screw formed in the threaded portion 176. Formed.

The guide groove 17 on the outer circumferential surface of the rear case 102 is mounted so that the adjustment ring 30 can be rotated in the circumferential direction, so that the threaded portion 194 described on the inner surface of the adjustment ring 30 is a pair of outer projections 184 of the spring male ring 172. It is screwed into the threaded portion 192 of the outer end surface of 186.

In the pressure adjusting unit 26 configured as described above, when the spring male ring 172 is disposed adjacent to the inner end surface of the joint member 98 as shown in FIG. 4, the bias force generated by the compression coil spring 172 is deformed. It is smaller than the force of the compression coil spring 158 of 107, and the reimbursement 148 is disposed in the closed position where the packing 156 as shown in FIG. 4 is placed on the seat 160 of the cap 144 by the force of the compression coil spring 158, The deformed body 148 disposed in the closed position places the actuator member 164 in the first position closer to the joint member 98 than the cap 144 as shown in FIG. 4 by the press-fit pin 150.

At this time, even if the pressure fluid from the pressure fluid supply means 28 is supplied into the fluid passage of the pressure adjusting unit 26 through the connecting hole 140, the pressure of the pressure fluid acts to pack the packing 156 against the toilet seat 160 on the toilet seat 160.

Therefore, the pressure fluid cannot pass through the toilet seat 160, and as a result, it does not reach the inner cavity of the outer cylinder member 24 of the pinching plate driving means 16.

That is, the pressing force by the pressure of the pressure fluid does not act on the second gripping plate 14.

In the case of applying a pressing force due to the pressure of the pressure fluid to the second clamping plate 14, first, the adjustment ring 30 is rotated to move the spring male ring 172 in a direction away from the joint member 98.

Accordingly, the compression coil spring 174 is compressed between the spring male ring 172 and the outer flange of the actuator member 164, and as a result, the increased force of the compressed coil spring 174 causes the actuator member 164 to be compressed from the compression coil spring 158 of the variant 107. It moves in a direction approaching the nipple member 136 against the counter force.

The above-described movement of the actuator member 164 transmitted to the variant 107 through the indentation pin 150 causes the variant 107 to move in a direction not far from the cap 144 and thus the variant 107 places the packing 156 in an open position away from the toilet seat 16.

At this time, the position of the actuator member 164 is set as the second position of the actuator member 164.

At this time, the pressure fluid supplied from the pressure fluid supply means 28 to the connection hole 140 of the pressure adjusting unit 26 is a change receiving hole 142 of the nipple member 136, a gap between the packing 156 and the toilet seat 160 of the variant 107, a press-fit pin insertion hole of the cap 144, It flows into the fluid passage 104 of the joint member 98 through the through hole 170 of the actuator member 164.

The pressure fluid flowing into the fluid passage 104 is provided with the compression coil 107 when the front case 100 is disposed at a circumferential position such that the radially outer end of the slide 110 is disposed at the deepest portion of the groove cam 120 of the front case 100. Resisting from the toilet seat 106 of the spring 104 to fall from the toilet seat 106 flows into the inner cavity of the outer cylinder member 24 of the pinching plate driving means 16.

When the radially outer end of the slider 110 is disposed at the deepest part of the home cam 120 of the front case 100, the increase in the secondary force of the compression coil spring 114 caused by the fall of the deformed body 107 at the toilet seat 106 is increased with respect to the footsie 108. By increasing the pressure of the zero ring 116 of the variant 107, the pressure fluid in the fluid passage 104 is reliably prevented from being discharged into the atmosphere through the pusher insertion hole and the exhaust hole 122 of the push 108 of the front case 100.

The pressure fluid introduced into the inner cavity of the outer cylinder member 24 of the throttle plate driving means 16 is the end piston 62 of the throttle plate driving means 16 as previously described in the description of the throttle plate driving means 16 with reference to FIGS. 2 and 3. And a second clamping plate 14 acting on the piston 48 of the first to fourth members 48A, 48B, 48C, 48D, as a result of the push-in lead screw shaft 22 augmented by the end piston 62 and the piston 48. Delivered to.

In the pressure adjusting unit 26 having the above-described configuration, when the sum of the pressures loaded by the pressure fluid on the nipple member shaft side of the actuator member 26 is greater than the biasing force of the compression coil spring 174, the actuator member 164 is the compression coil spring 174. Resistant to the force of N, it is not far from the actuator member shaft end face of the nipple member 136, and moves to the first position approaching the joint member 98 as shown in FIG.

As a result, the variant 148 is returned to the closed position shown in FIG. 4 by the pressure of the pressure fluid and the force of the compression coil spring 158, and the pressure fluid supply means 28 in the inner hole of the outer cylinder member 24 of the pincer plate driving means 16 is The high pressure of the fluid is blocked.

Here, the pressure fluid in the inner air of the outer cylinder member 24 of the pincer plate driving means 16 flushes the deformed body 107 in the fluid passage 104 of the tightening member 98 to the closed position above the toilet seat 106, Prevent leakage of pressure fluid in the cavity.

Therefore, even after the supply of the pressure fluid is interrupted, the lead screw shaft 22 of the pinching plate driving means 16 also transmits to the second pinching plate 14.

The pressure input is the same as before shutting off the supply of pressure fluid.

Here again, if the front case 100 is placed in the circumferential position such that the radially outer end of the chest 110 is arranged at the shallowest portion of the groove cam 120 of the front case 100, the activator 110 is applied to the biasing force of the compression coil spring 114. It resists and moves radially inward, causing the zero ring 116 to fall to the bottom wall of the foot 108.

As a result, the pressure fluid in the inner cavity of the outer cylinder member 24 of the gripping plate driving means 16 is discharged into the atmosphere through the pusher insertion hole and the exhaust hole 122 of the front case 100, and is pushed to the second tongue plate 14 through the lead screw shaft 22. The pressure pressure caused by the fluid pressure in the inner cavity of the outer cylinder member 24 that has been transmitted is clarified.

The pressure applied to the second pinning plate 14 through the lead screw shaft 22 through the lead screw shaft 22 using the pressure fluid supplied into the inner hole of the outer cylinder member 24 is the pressure supplied to the inner hole of the outer cylinder member 24. It is proportional to the magnitude of the pressure of the fluid.

The pressure magnitude of the pressure fluid supplied into the inner cavity of the outer cylinder member 24 is the pressure when the actuator member 164 is moved to the first position against the side force of the compression coil spring 174 and thus the variant 148 is returned to the closed position. It is proportional to the size of the fluid.

That is, the pressure fluid is proportional to the size loaded on the second gripping plate 14 by the gripping plate driving means 16, and the increase and decrease of the secondary force of the compression coil spring 174 is the magnitude of the pressing force in the second grating plate 14. To increase or decrease.

The increase and decrease of the secondary force of the compression coil spring 174 is caused by the relative movement of the spring male ring 172 in the inner cavity of the rear case 102, by the relative movement of the spring male ring 172, and this movement of the spring male ring 172. Is obtained by the rotation of the adjustment ring 30 on the outer circumferential surface of the rear case 102.

As described above, it can be seen that the size of the secondary force of the compression coil spring 174 can be adjusted by the adjustment ring 30 and the spring male ring 172 combined therewith.

The adjusting ring 30 and the spring receiving ring 172 constitute a subordinate force adjusting means for adjusting the magnitude of the secondary force of the compression coil spring 174.

On the outer surface of the scale base element 190 on the outer circumferential surface of the rear case 102, a scale plate 196 indicating the size of the pushing force generated in the second pinning plate 14 in proportion to the movement distance of the spring receiving ring 172 is fixed.

The scale in the scale plate 196 corresponding to the tip of the indicator needle 186 moving with the spring male ring 172 is then supplied by supplying the pressure fluid from the pressure fluid supply means 28 through the pressure adjusting unit 26 to the pincer plate driving means 16. The magnitude of the pressure input generated in the sandwich plate 14 is shown.

When looking at the scale plate 196, the indicator hand 186 is clearly visible on the scale plate 196 so that you can see at a glance the size of the pressure input indicated by the tip of the indicator needle 186 at a glance. It is preferable to color with.

The pressure adjusting unit 26 in this embodiment has a normal appearance, but does not have projections protruding outward in the radial direction.

In addition, the pressure adjusting unit 26 is connected concentrically in a straight line with respect to the gripping plate driving means 16 having a normal appearance.

Therefore, the pressure adjusting unit 26 can be handled integrally with the pinching plate driving means 16, and the adjusting ring 30 can be easily operated even if the pinching plate driving means 16 is facing in any direction from the base frame 10th position.

In this embodiment, the pressure adjusting unit 26 is moved relative to the rotation of the adjusting ring 30 in the longitudinal direction of the pressure adjusting unit 26 relative to the position on the scale plate 196 by the rotation of the adjusting ring 30. The indicator plate 186 indicating the magnitude of the pressure input to be loaded is provided on the pinned plate 14 of FIG.

The combination of the indicator hand 186 and the scale plate 196 marks the baseline on the outer circumferential surface of the adjustment ring 30 and marks the same content as the scale of the scale plate 196 on the outer case of the front case 100 or the rear case 102. In this case, or vice versa, the scale is the same as the scale of the scale plate 196 of the above embodiment on the outer circumferential surface of the adjustment ring 30, and at the same time compared with the case where the baseline is marked on the outer circumferential surface of the front case 100 or the rear case 102. It is remarkably easy to move the indicator hand 186 within the scale range of the scale plate 196 because it requires a plurality or rotation of the adjustment ring 30.

Although only one combination was used in this embodiment, the combination was formed every 120 degrees in the circumferential direction on the outer surface of the rear case 102, and the scale was independent of the position of the gripping plate manual means 16 at the tenth frame of the base frame. The poison can be enjoyed again.

7 schematically shows the longitudinal section of the fixing unit 32.

As shown in FIG. 7, the engaging surface 200 having a T-shaped cross section is formed on the two surfaces of the sub base member 20, and the engaging groove 200 is directed in the longitudinal direction of the sub base member 20.

In general, a through hole 202 of a relatively large diameter is formed in the center of the mountain wall of the base frame 10 to face the back surface of the subbase member 20, and a disc-shaped casing 204 is disposed on the back surface of the upper wall of the base frame 10 to face the through hole 202. It is.

The casing 204 is composed of an upper-case member 208, a lower-case member 210, and the like coupled to each other while the diaphragm 206 is sandwiched.

The inner surface of the lower case member 210 which the diaphragm 206 abuts is formed with an annular groove 212. The annular groove 212 is arranged by the pressure fluid supply means 28 shown in FIG. A connecting hole 216 is formed in which the tip of another pressure fluid supply hose 214 is hermetically screwed together.

The inner surface of the up-case member 208 where the diaphragm 206 abuts is formed with a storage cell 218 with a jaw concentrically with the upper case member 208. A through hole is formed in the center of the bottom wall of the containment chamber 218, and the engagement rod 220 for engaging with the engaging groove 200 of the subbase member 20 of the gripping unit 18 is inserted into the sliding material in the direction along the center line of the narrow width direction. It is. Engagement rod 220 includes a hydraulic pressure portion 222 on the disk accommodated in the large diameter region of containment element 218 to be movable in the direction along the longitudinal center line, and the upper surface of the engagement rod 220 in the direction along the longitudinal center line. The produced protrusion 224 is formed.

The projection 224 is provided with an air hole of the engaging plate 226 which has a generally T-shaped cross section and a spherical planar shape and is disposed in the engaging groove 200 of the subbase member 20. The lower surface 228 of both ends of the transverse direction extension part of the engaging plate 226 engages with respect to the upper surface 230 of the shoulder part of the engaging groove 200 of the subbase member 20 in the direction along the longitudinal center line.

A stop ring 232 is bolted to the upper surface of the protrusion 224 to prevent the engagement plate 226 from falling off from the protrusion 224. A plate spring is disposed on the lower surface of the stop ring 232 to prevent the flow of the engagement plate 226 on the protrusion 224. 234 is fitted. The engagement rod 220 is equipped with a disc spring 236 in the small diameter region of the containment element 218, and the disc spring 236 connects the engagement rod 220 with the low surface of the small diameter region in the subbase member 29 of the sandwich unit 18 and the upper portion of the hydraulic section 222. Is in contact with the surface.

The auxiliary force strengthens the engagement of the engagement plate 226 of the engagement rod 220 with respect to the engagement groove 200 of the subbase member 20. At this time, the pressure receiving portion 222 of the engagement rod 220 is in light contact with the diaphragm 206.

The pin 238 protruding in the direction along the longitudinal center line is implanted in the low surface of the large diameter area of the containment element 218, and the pin 238 is inserted into the through-hole 240 formed in the hydraulic part 222 of the engagement rod 220.

Pin 238 prevents relative rotation of engagement rod 220 relative to casing 204.

In the fixed unit 32 configured as described above, when no pressure fluid is supplied into the annular groove 212 through the pressure fluid supply hose 214 by the pressure fluid supply means 28, the engaging plate 226 of the engagement rod 220 is formed as described above. The force of the spring 236 is firmly engaged with the engagement groove 200 of the sub base member 20.

Accordingly, the subbase member 20 firmly clamps the base frame 10 in cooperation with the upper case member 298 of the casing 204 of the fixing unit 32, whereby the clamping unit 18 having the subbase member 20 is firmly fixed to the base frame 10th position.

When the pressure fluid is supplied by the pressure fluid supply means 28 in the fixed unit 32 configured as described above, the total pressure applied to the pressure diaphragm 206 of the pressure fluid is greater than the negative force of the disc spring 236, and as a result, it is engaged. The rod 220 moves in a direction closer to the subbase member 20 of the gripping unit 18, that is, upwardly to release the engaging plate 226 to the engaging groove 200 of the subbase member 20. As a result, the clamping unit 18 having the subbase member 20 can move freely while connecting the tenth frame of the base frame with the fixing unit 204 through the engagement rod 220, and can rotate freely.

However, the range in which the narrow frame unit 18 can move freely from the base frame 10 is regulated by the range in which the engagement rod 220 can move freely in the through hole 202 of the base frame 10.

After placing the gripping unit 18 in the desired position at the 10th position of the base frame, the supply of pressure fluid was cut off from the pressure fluid supply means 28 to the annular groove 212 of the fixed unit 32 by the switching 34 on the pressure fluid supply pipe 214. At the same time, the annular groove 212 is in communication with the atmosphere.

As a result, the pressure of the pressure fluid in the annular groove 212 is equal to the atmospheric pressure, and by the force of the engaging rod 220 and the disc spring 236, the engaging plate 226 is firmly engaged with the engaging groove 200 of the subbase member 20, i.e., the lower side. The clamping unit 18 is firmly fixed to the tenth frame of the base frame.

The clamping device according to the embodiment of the present invention using the fixing unit 32 having the above-described configuration is used on the head of the machine tool even when the position of the person on the head is used in a machine tool such as a small paddle which cannot move back and forth, right and left. Once the base frame 10 is firmly fixed, the clamping unit 18 with the pair of clamping plates 12 and 14 can be securely fixed at any position on the bet, so that the machining position or change in the workpiece or a pair of Whenever the workpiece is removed between the plates 12 and 14, there is no need for complicated release of the base frame 10 against the bets, or restocking.

Therefore, the machining efficiency of the workpiece in the machine tool can be improved significantly compared with the conventional one.

In the fixing unit 32 having the above-described configuration, since the rigid fixing of the sandwich unit 18 on the base frame 10 is achieved by the negative force of the disc spring 236, the release of the workpiece during processing of the workpiece is reliably released.

The above-described embodiment is for the purpose of illustrating the present invention, and the present invention is not limited at all, and any change and modification within the technical scope of the present invention are included in the present invention.

For example, the number of members constituting each of the piston 46 and the cylinder 50 in the pinching plate driving means 16 is freely set in accordance with the necessity of the magnitude of the pressure force that must be generated by moving the compressed fluid in the pinching plate driving means 16. You can do it. Oil can also be used as a pressurized fluid.

Claims (3)

A gripping device comprising a base frame, a pair of gripping plates formed so as to fold relatively relative to the base frame, and a gripping plate driving means for driving a pair of grating plates, wherein the gripping plate and the gripping plate are provided. And a fixing unit which is connected to a sandwich unit having plate driving means and fixes the sandwich unit at an arbitrary position on the base frame, wherein the sandwich unit is fixed to one of the sandwich plate and the sandwich plate driving means. The other gripping plate is driven by the gripping plate driving means, and has a subbase buoy formed of a relatively movable material so as to fold with respect to one gripping plate, and the gripping plate driving means has a lead fixed at one end to the other grating plate. It is formed of a subbase member so as to be a rotating material concentrically with the screw shaft and the lead screw shaft, and connects the inner hole to the pressure fluid supply means. The outer cylinder member having the stage and the inner cylinder of the outer cylinder member are rotated integrally with the outer cylinder member in the circumferential direction of the outer cylinder member, and are arranged to be relatively sliding materials with respect to the outer cylinder member in the direction along the longitudinal center line of the outer cylinder member. It is arranged to slide relative to the outer cylinder member in the direction along the longitudinal center line of the outer cylinder member in the inner hole of the inner cylinder member and the inner member of the screw shaft, and the pressure of the fluid supplied into the inner hole of the outer cylinder member by the pressure fluid supply means And a piston for driving the inner cylinder member to protrude in the outer cylinder member as it slides in the inner hole of the outer cylinder member. Also, the base frame has a through hole formed at a position opposite to the subbase member, and the fixing unit is the pinching unit. The surface on which The opposite side is arranged on the surface area of the base frame opposite to the opposite hole, having a means for connecting the inner hole to the pressure fluid supply means, and a moving material in the casing in a direction along the center line of the through hole. And engaging rods in the casing, in which the subbase member and the subbase member of the gripping unit are brought closer to the base frame, and disposed in the casing and supplied to the casing by the pressure fluid supply means. And a diaphragm member for pressing the engagement rod in a direction of releasing the engagement with the subbase member of the gripping unit under pressure. The holding device according to claim 1, wherein the holding plate driving means has a pressure adjusting unit for controlling the amount of eye force supplied into the inner cavity of the outer cylinder member from the pressure fluid supply means. The fluid passage according to claim 2, wherein the pressure adjusting unit has a fluid passage connected to the outer cylinder member, the fluid passage communicating with the pressure fluid supply means connecting means of the outer cylinder member, and a means for connecting the fluid passage to the pressure fluid supply means; A moving body disposed between the change formed in the fluid passage and the closed position seated on the toilet seat in the fluid passage and the open position away from the toilet seat, and moving between the first position and the second in the fluid passage; Allows placement of the tradition in the closed position at the position of, and drives the deformed body to the open position by moving from the first position to the second position, and receives the pressure of the pressure fluid in the fluid passage to the first position. And an actuator member formed in the main body, and a biasing means formed in the main body and urging the actuator member to a second position against the pressure of the pressure fluid in the fluid passage, and exposed to the outer surface of the main body. The clamping device provided in the main body and provided with the buoyancy adjustment means which adjusts the boosting force which a biasing means produces | generates.