JPH10311308A - Clamp device and drive force input structure to clamp lever - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve turning quality of a shaft member, and prevent wearing of a clamp lever, shaft member and a wedge member. SOLUTION: In a drive force input structure 60 of a clamp device, a pair of pivotally supported shaft parts 30 pivotally supported to a pivotal support hole 36 of an input part 22 are formed in front/rear both end parts of a shaft member 4, and a notched surface 31 of width equal to a diameter of the shaft member 4 is formed between a pair of the pivotally supported shafts 30. A partial cylinder surface 32 turnably engaged with a seat surface 37 of the input part 22 is formed in an upper side of the notched surface 31, consequently, even when drive force is input to the input part 22 through the shaft member 4, turning quality of the shaft member 4 is improved without deforming a shape of the partial cylinder surface 32 and the seat surface 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for fixing a clamp target such as a mold and a drive force input structure to a clamp lever, and more particularly, to a wedge member driven and moved by an actuator, The present invention relates to a clamp device configured to input a driving force to an input portion of a clamp lever.

[0002]

2. Description of the Related Art Conventionally, various relatively small clamping devices for fixing a die or the like to a predetermined installation portion (the upper surface of a bolster of a press machine or the lower surface of a movable plate at the lower end of a ram) have been put to practical use. Among them, a clamp body, a clamp lever pivotally supported on the clamp body via a pivot shaft and having an output portion and an input portion, and a driving force moved by an actuator and input to the input portion of the clamp lever by boosting the driving force. Clamping devices having wedge members are widely used in practice.

[0003] A structure for inputting driving force to a clamp lever in this type of clamp device has a shaft member 110 having a notch surface 111 as shown in FIGS. 8 and 9.
The partial cylindrical surface 112 of the shaft member 110 is
The input portion 101 is rotatably engaged with a partially cylindrical seating surface 102 formed on the input portion 101. The notch surface 111 is exposed on the lower surface side of the input unit 101, and is moved to the left by a wedge member 115.
And the driving force is input to the input portion 101 via the shaft member 110, and even if the clamp lever 100 rotates a predetermined angle around the pivot shaft center 103, the shaft member 110 rotates and the wedge The state where the inclined surface 116 of the member 115 is in contact with the notch surface 111 without contacting the input unit 101 is maintained.

[0004]

In the clamping device, the partial cylindrical surface 112 of the shaft member 110 engages with the partial cylindrical seating surface 102 of the clamp lever 100, as shown in FIG.
The shaft member is moved by the wedge member
Since the driving force is input to the input unit 101 via the input lever 110, the shaft member 110 (partial cylindrical surface 112) is deformed when the driving force is input to the clamp lever 100, and is used repeatedly for a long time. While the seating surface 102 and the vicinity thereof are plastically deformed and sagged, as shown in FIG.
The radius of curvature of 102 becomes larger, and the partial cylindrical surface of shaft member 110
The contact area with the contact surface 112 becomes very small, and the surface pressure acting on the seat surface 102 and the partial cylindrical surface 112 becomes very large. Therefore, the rotation of the shaft member 110 is deteriorated, and the seating surface 102 and the partial cylindrical surface 112 are easily worn.

Further, in order to prevent the shaft member 110 from coming off the input portion 101, the seating surface 102 is formed in a partial cylindrical shape having at least a 180-degree arc. As a result, the notch surface 111 exposed to the lower surface side of the input portion 101 of the clamp lever 100
Notch 111 and inclined surface 116
Surface pressure acting on the notch surface 111 and inclined surface
116 also wears easily.

An object of the present invention is to provide a clamp device having a shaft member rotatably provided at an input portion of a clamp lever and a wedge member for inputting a driving force to the input portion, and a driving force input structure to the clamp lever. , To improve the rotation of the shaft member, to prevent wear of the clamp lever, the shaft member, and the wedge member.

[0007]

According to a first aspect of the present invention, there is provided a clamp device which is pivotally supported by a clamp body via a pivot shaft and has an output portion at a distal end portion and an input portion at a proximal end portion. A shaft member having a lever, a partial cylindrical surface rotatably engaged with a partial cylindrical seating surface formed at an input portion of the clamp lever, and a cutout surface exposed to the lower surface side of the input portion; A wedge member having an inclined surface that is in surface contact with the notch surface and being moved and driven by an actuator, a pair of pivots connected to the seat surface are provided at both ends in the width direction of the input portion of the clamp lever. A support hole is formed, and at both end portions of the shaft member, pivot support shaft portions respectively supported by the pair of pivot support holes are formed, and the shaft member is provided between the pair of pivot support shaft portions. The notched surface is formed.

[0008] Even if the wedge member is moved and driven by the actuator, and the driving force is input to the input portion through the shaft member by the wedge member, the pair of pivot holes are not deformed. Is maintained substantially constant, and the pair of pivot shafts of the shaft member are not deformed, so that the shape of the partial cylindrical surface is maintained substantially constant. Therefore, the contact area between the pair of pivot holes, the pair of pivot shafts and the seating surface and the partial cylindrical surface is maintained at a constant size, and the surface pressure acting on those contact surfaces increases. Can be suppressed, the rotation of the shaft member is improved,
The pivot hole and seating surface of the clamp lever, the pivot shaft portion of the shaft member and the partial cylindrical surface are less likely to be worn.

Further, since the pair of pivot shafts are pivotally supported by the pair of pivot holes, the shaft members do not come off from the input portion, and the contact area between the seating surface and the partial cylindrical surface is also improved. It is no longer necessary to make the seating surface too large, so that the seating surface can be formed in a partially cylindrical shape having an arc of 180 degrees or less, and a notch surface having a large area exposed to the lower surface side of the input portion can be provided. The surface pressure acting on the inclined surface and the inclined surface is reduced, and the notched surface and the inclined surface are hardly worn.

According to a second aspect of the present invention, in the first aspect of the present invention, the pair of pivot holes are opposed to a pair of pivot portions extending from both ends in the width direction of the input portion of the clamp lever toward the wedge member. The wedge member is loosely fitted between the pair of pivot portions, and its inclined surface is in surface contact with the notched surface of the shaft member. Therefore, the notch surface having a large area can be reliably exposed to the lower surface side of the input portion of the clamp lever, and the inclined surface can be reliably brought into surface contact with the notch surface. Other operations are the same as those of the first aspect.

According to a third aspect of the present invention, in the second aspect of the present invention, the notch surface has the same width as the diameter of the shaft member. Therefore, the surface pressure acting on the notch surface and the inclined surface can be greatly reduced. Other effects are the same as those of the second aspect.

According to a fourth aspect of the present invention, there is provided the clamping device.
In the invention according to any one of the above, a pair of pivot holes of the clamp body that pivotally supports the pivot shaft is formed as an oblong hole elongated in the moving direction of the wedge member, and the clamp lever has an output portion thereof. Can be switched between a clampable position protruding out of the distal end of the clamp body and a retracted position in which the output portion is retracted into the clamp body in a clamp release state. Therefore, by switching the clamp lever at the clampable position to the retracted position in a state where the clamp is released, a predetermined installation portion of the object to be clamped such as a mold (upper surface of a bolster of a press machine).
It is very easy to carry in and out the work. In addition, the same operation as any one of the first to third aspects is achieved.

According to a fifth aspect of the present invention, there is provided a structure for inputting a driving force to a clamp lever, wherein a partial cylindrical seating surface formed at an input portion of the clamp lever of the clamping device, and a partial cylinder rotatably engaged with the seating surface. A shaft member having a cutout surface exposed to the outside of the surface and the outer surface of the input portion; and a slope having a slope contacting the cutout surface of the shaft member, and inputting a driving force from the actuator to the input portion via the shaft member In a structure for inputting driving force to a clamp lever having a wedge member, a pair of pivot holes connected to the bearing surface are formed at both end portions in the width direction of the input portion, and at both end portions of the shaft member, The pair of pivot holes are formed with pivot shaft portions respectively pivotally supported, and the notch surface is formed in the shaft member between the pair of pivot shaft portions.

Even if the driving force from the actuator is input to the input portion via the shaft member by the wedge member, the pair of pivot holes are not deformed, so that the shape of the partially cylindrical seating surface is maintained substantially constant. Also, since the pair of pivot shafts are not deformed, the shape of the partial cylindrical surface is maintained substantially constant. Therefore,
The contact area between the pair of pivot holes, the pair of pivot shafts and the seating surface and the partial cylindrical surface is maintained at a constant size, and it is possible to suppress an increase in surface pressure acting on the contact surfaces. The pivotability of the shaft member is improved, and the pivot hole and seat surface of the clamp lever, the pivot shaft portion of the shaft member, and the partial cylindrical surface are less likely to be worn. Further, since the pair of pivot shafts are pivotally supported by the pair of pivot holes, the shaft members do not come off the input portion, and the contact area between the seating surface and the partial cylindrical surface is too large. Therefore, the seating surface can be formed in a partially cylindrical shape having a circular arc of 180 degrees or less, and a notch surface having a large area exposed to the lower surface side of the input portion can be provided. The surface pressure acting on the notch surface and the notched surface and the inclined surface are hardly worn.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to a clamp device for fixing a mold to an upper surface of a bolster.

As shown in FIG. 1 to FIG.
A clamp lever 3 which is supported by the clamp body 2 via a pivot shaft 20 oriented in the front-rear direction and has an output portion 21 at a left end and an input portion 22 at a right end; The input unit 22 includes a driving force input structure 60 for inputting a driving force to the input unit 22 and an air cylinder 6 for moving the wedge member 5 of the driving force input structure 60 in the left-right direction.

The clamp body 2 has a pair of front and rear wall members 10 and 11 and a rectangular parallelepiped block member 13 provided at a lower right end portion between the pair of wall members 10 and 11. The wall members 10 and 11 and the block member 13 are formed by a pair of bolts 14.
A gap 15 having a predetermined front and rear width is formed between the wall members 10 and 11, and the clamp lever 3, the shaft member 4, and the wedge member 5 are movably disposed in the gap 15.

The pair of wall members 10 and 11 are formed with a pair of oblong holes 10a and 11a (pivot holes) elongated in the left-right direction facing the gap 15 so as to face each other. 1
Both ends of the pivot shaft 20 of the clamp lever 3 are movably engaged in the left-right direction with the clamp lever 3 and are pivotally supported. Bolt holes 10b, 11b are formed in the wall members 10, 11, and the clamp body 2 is fixed to the bolster 9 by a pair of bolts 19 inserted through the bolt holes 10b, 11b (see FIG. 3). .

The clamp lever 3 has substantially the same front and rear width as the gap 15 (both right and left sides thereof slide on the inner surfaces of the pair of wall members 10 and 11). It is inserted and provided. Note that the pivot shaft 20 may be fixedly provided on the clamp lever 3 or may be rotatably provided. Also, instead of the pivot shaft 20, the oblong hole 10
The pivot shaft portions corresponding to both end portions of the pivot shaft 20 pivotally supported by a and 11a may be formed integrally with the clamp lever 3.

The clamp lever 3 has a clampable position (see FIG. 1) where the output portion 21 protrudes outside the left end of the clamp body 2, and the output portion 21 when the clamp is released.
Retracted position of retracted into the clamp body 2 (see FIG. 2)
When the clamp lever 3 is located at the clamp position, both ends of the pivot shaft 20 contact the left ends of the pair of oblong holes 10a and 11a, and the input unit 22 is turned on.
When the driving force is input to the clamp lever 3 in the initial position shown by the solid line in FIG. 1, the clamp lever 3 is rotated around the pivot shaft 20 to the clamp position shown by the chain line in FIG. Is clamped. Note that the posture of the clamp lever 3 in the clamp released state is the initial posture.

The clamp lever 3 has a pivot shaft 20.
A lever 23 extending downward at the lower side is integrally formed, and a coil spring 24 is interposed between the lever 23 and the block member 13, and the lever 23 is urged to the left by the coil spring 24. And coil spring 2
The clamp lever 3 in the clamp position at the clampable position is returned to the initial position by the urging force of 4, and
The clamp lever 3 at the retreat position is moved to a clampable position. The left end of the coil spring 24 is connected to the lever 23 via a spring receiver 25.

At the upper end of the clamp body 2, a position detecting mechanism 8 for detecting the clampable position and the retracted position of the clamp lever 3 is provided.
Is a rod 71 having an engaging portion 71a that engages with the groove 70 at the upper end of the clamp lever 3 and moves in the left-right direction together with the clamp lever 3, a guide member 72 that guides the rod 71 in the left-right direction, and a right end of the rod 71. Pushing member 73 provided on the mounting plate 74 when the clamp lever 3 is in the clampable position and the retracted position is fixed on the mounting plate 74, respectively.
The sensors 75 and 76 are electrically connected to a control unit (not shown) by electric signal lines 75a and 76a. The rod 7
1 and the sensors 75 and 76 are covered by a cover member 77.

The driving force input structure 60 for inputting the driving force of the air cylinder 6 to the input portion 22 of the clamp lever 3 will be described with reference to FIGS. 1, 2, and 5 to 7. The shaft member 4 has the same front-rear length as the clamp lever 3 (both left and right surfaces are in sliding contact with the inner surfaces of the pair of wall members 10 and 11),
A pair of pivot shaft portions 30 are formed at both front and rear end portions of the shaft member 4, and a notch surface 31 having the same width as the diameter of the shaft member 4 is formed between the pair of pivot shaft portions 30. A partial cylindrical surface 32 is formed above the surface 31.

On the other hand, a pair of front and rear pivot portions 35 extending from the input portion 22 to the wedge member 5 side (lower side) are formed in the input portion 22 of the clamp lever 3, and are formed opposite to each other. A pair of pivot shaft portions 30 are pivotally supported by the pair of pivot holes 36 thus formed. Lower surface 22a of input unit 22 and 1
The lower surfaces 35a of the pair of pivot portions 35 are formed in parallel.
Lower surface 22a of input unit 22 between a pair of pivots 35
Is formed with a partially cylindrical seating surface 37 having an arc of about 120 degrees, the partial cylindrical surface 32 is slidably engaged with the seating surface 37, and the cutout surface 31 of the shaft member 4 is located below the input portion 22. It is exposed outside the side outer surface 22a.

The wedge member 5 is slidably supported on the upper surface of the block member 13, and a convex portion 40 is formed at the upper end of the wedge member 5 so as to be loosely fitted between the pair of pivot portions 35. Inclination angle a that makes surface contact with notch surface 31 of shaft member 4
An inclined surface 41 (for example, a = 12 degrees) is formed.
A pair of stepped surfaces 42 on both front and rear sides of the convex portion 40 are formed in parallel with the lower surface 35 a with a gap from the lower surface 35 a of the pair of pivot portions 35. When the clamp lever 3 is in the initial posture, the step-down surface 42 and the lower surface 35a of the pivotal support 35 are set to be parallel.

At the left end of the wedge member 5, a locking member 4
When the wedge member 5 is driven to move rightward by the air cylinder 6 from the state shown in FIG. 1, the input member 22 of the clamp lever 3 is
Is locked, and the clamp lever 3 at the clampable position moves rightward and switches to the retracted position in FIG.
When the air cylinder 6 moves the wedge member 41 right and left from the state of FIG. 2, the coil spring 24 moves the clamp lever 3 at the retracted position to the left and switches to the clampable position of FIG.

The air cylinder 6 includes a cylinder body 50 having a cylinder member 51 and a pair of lid members 52 and 53, and a piston 5 slidably fitted inside the cylinder body 50.
4, a piston rod 55 fixed to the piston 54, extending leftward through the cover member 52, and having the wedge member 5 fixed to the tip thereof; and an air operating chamber 56 partitioned by the piston 54 inside the cylinder body 50. , 57, and large and small 2 which is installed in the air working chamber 57 and urges the piston 54 to the left.
It has two coil springs 58 and 59. In addition, the air working chamber 5
Reference numerals 6, 57 are sealed by seal members 50a, 50b, 50c.

The air port 56 is supplied by an air supply source (not shown).
When pressurized air of a predetermined pressure is supplied from a to the air working chamber 56, the piston 54 and the piston rod 55 are driven to move rightward against the urging force of the coil springs 58 and 59. When the pressurized air in the air working chamber 56 is released, the piston 54 and the piston rod 55 move leftward due to the urging force of the coil springs 58 and 59. Furthermore, clamp lever 3
When pressurized air is supplied from the air port 57a to the air working chamber 57 by the air supply source in a state where is located at the clampable position, the wedge member 41 is driven to move leftward,
A driving force is input to the input section 22 of the clamp lever 3 via the shaft member 4.

Since the inclination angle of the inclined surface 41 of the wedge member 5 is about 12 degrees, the input portion 22 of the clamp lever 3
The driving force input to the motor is boosted to about five times the output of the air cylinder, and the lever length from the pivot shaft 20 to the input unit 22 is about 3 times the lever length from the pivot shaft 20 to the output unit 21. Therefore, the clamping force acting on the output portion 21 of the clamp lever 3 is about three times the driving force and about 15 times the output of the air cylinder 6.

The operation and effect of the clamp device 1 will be described. Even if a load is input to the input section 22 via the shaft member 4 by the wedge member 5 driven to the left by the air cylinder 6, the pair of pivot holes 36 are not deformed. The shape of the surface 37 is kept substantially constant. Therefore, a pair of pivot holes 36, a pair of pivot shaft portions 30, and the seat surface 3
In this driving force input structure 60, the rotation of the shaft member 4 can be suppressed since the contact area between the cylindrical member 7 and the partial cylindrical surface 32 can be maintained at a constant size and the surface pressure acting on those contact surfaces can be suppressed from increasing. The mobility is improved, and the pivot hole 36, the seat surface 37, the pivot shaft portion 30, and the partial cylindrical surface 32 are hardly worn.

A partially cylindrical bearing surface 37 having an arc of about 120 degrees.
Since the partial cylindrical surface 32 of the shaft member 4 is slidably engaged with the shaft member 3, the cutout surface 31 exposed to the lower surface 22 a side of the input portion 22 of the clamp lever 3 is made to have the same width as the diameter of the shaft member 3. It can be formed and its area can be increased. Therefore, the surface pressure acting on the notch surface 31 and the inclined surface 41 can be reduced, and the notch surface 31 and the inclined surface 41 are hardly worn.

A pair of pivot holes 36 are formed on the pair of pivot portions 35 extending downward from the input portion 22 of the clamp lever 3 so as to face each other. Since the slack surface 41 is loosely fitted between the support portions 35 and the inclined surface 41 is brought into surface contact with the notch surface 31 of the shaft member 4, the notch surface 31 having a large area is surely directed to the lower surface 22 a side of the input section 22. The inclined surface 41 can be reliably brought into surface contact with the cutout surface 31 by being exposed.

The clamp lever 4 has a clampable position at which its output portion 21 is projected outside the distal end of the clamp body 2;
Since the output unit 21 can be switched to the retreat position in which the output unit 21 retreats into the clamp body 2 in the clamp release state, the state in which the clamp lever 3 is switched to the retreat position is provided.
The work of carrying the mold W into and out of the bolster 9 can be performed very easily.

Incidentally, the pivot shaft 20 may be pivotally supported on the clamp body 2 so as not to be movable in the left-right direction so that the position of the clamp lever 3 is not switched. Further, instead of the air cylinder 6, other various actuators such as a hydraulic cylinder may be applied. The clamp device 1 is not limited to fixing a mold W of a press machine, but can be applied as a device for fixing various objects to be clamped such as a mold of an injection molding machine.

[0035]

According to the first aspect of the present invention, even when the wedge member is moved and driven by the actuator and the driving force is input to the input portion via the shaft member by the wedge member, the pair of pivot holes are formed. Since it is not deformed, the shape of the partial cylindrical seating surface is maintained substantially constant, and the pair of pivot shaft portions of the shaft member is not deformed, so that the shape of the partial cylindrical surface is maintained substantially constant. Therefore, the surface pressure acting on the pair of pivot holes, the pair of pivot shafts, and the seating surface and the partial cylindrical surface is suppressed, the rotation of the shaft member is improved, and the pivot holes and the seating surface are reduced. In addition, the pivot shaft and the partial cylindrical surface are less likely to be worn. Furthermore, since the seating surface is formed in a partial cylindrical shape having a circular arc of 180 degrees or less, and a notch surface having a large area exposed to the lower surface side of the input portion can be provided, the cut surface and the inclined surface are acted on. Surface pressure is reduced, and the notched surface and the inclined surface are hardly worn.

According to the clamp device of the second aspect, the same effect as that of the first aspect is obtained, except that the pair of pivot holes extend from both ends in the width direction of the input portion of the clamp lever toward the wedge member. The wedge member is loosely fitted between the pair of pivot portions, and the inclined surface thereof is brought into surface contact with the notch surface of the shaft member. The lower surface of the input portion of the clamp lever is reliably exposed, and the inclined surface can be reliably brought into surface contact with the cutout surface.

According to the clamp device of the third aspect, the same effect as that of the second aspect is obtained, but since the notch surface has the same width as the diameter of the shaft member, it acts on the notch surface and the inclined surface. Surface pressure can be greatly reduced.

According to the clamp device of the fourth aspect, the same effect as any one of the first to third aspects is obtained, but the clamp lever in the clampable state is switched to the retracted position with the clamp released. This makes it possible to very easily carry in / out the work to be clamped, such as a mold, into a predetermined installation portion (such as the upper surface of a bolster of a press machine).

According to the driving force input structure to the clamp lever of the fifth aspect, even if the driving force from the actuator is input to the input portion through the shaft member by the wedge member, the driving force is input by the wedge member through the shaft member. Even when a driving force is input to the portion, the pair of pivot holes are not deformed, so that the shape of the partially cylindrical seating surface is maintained substantially constant, and the pair of pivot shaft portions of the shaft member is not deformed. The shape of the partial cylindrical surface is maintained substantially constant. Therefore, the surface pressure acting on the pair of pivot holes, the pair of pivot shafts, and the seating surface and the partial cylindrical surface is suppressed, the rotation of the shaft member is improved, and the pivot holes and the seating surface are reduced. In addition, the pivot shaft and the partial cylindrical surface are less likely to be worn. Furthermore, since the seating surface is formed in a partial cylindrical shape having a circular arc of 180 degrees or less, and a notch surface having a large area exposed to the lower surface side of the input portion can be provided, the cut surface and the inclined surface are acted on. Surface pressure is reduced, and the notched surface and the inclined surface are hardly worn.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a clamp device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a longitudinal sectional view of a clamp device (in a clamp released state).

FIG. 5 is a front view of a driving force input structure of the clamp device.

FIG. 6 is a perspective view of a driving force input structure.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

FIG. 8 is a perspective view of a driving force input structure according to the related art.

FIG. 9 is a longitudinal sectional view of a driving force input structure according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp device 2 Clamp main body 3 Clamp lever 4 Shaft member 5 Wedge member 6 Air cylinder 10a, 11a Oval hole (pivot hole) 20 Pilot shaft 21 Output part 22 Input part 30 Pilot support part 31 Notch surface 32 Partial cylindrical surface 36 pivot hole 37 seat surface 41 inclined surface 60 driving force input structure

Claims (5)

[Claims] 1. A clamp body, a clamp lever pivotally supported by the clamp body via a pivot shaft and having an output portion at a distal end and an input portion at a base end, and an input portion of the clamp lever. A shaft member having a partial cylindrical surface rotatably engaged with the partial cylindrical seating surface and a cutout surface exposed to the lower surface side of the input unit; and an inclined surface which comes into surface contact with the cutout surface of the shaft member. A wedge member that is moved and driven by an actuator; a pair of pivot holes connected to the seating surface are formed at both end portions in the width direction of the input portion of the clamp lever; In the portion, a pivot shaft portion pivotally supported by the pair of pivot holes is formed, and the cutout surface is formed in the shaft member between the pair of pivot shaft portions. And clamping device. 2. The pair of pivot holes extend from both ends in the width direction of the input portion of the clamp lever toward the wedge member.
The wedge member is loosely fitted between the pair of pivot portions, and the inclined surface thereof is in surface contact with the notch surface of the shaft member. The clamping device as described. 3. The clamping device according to claim 2, wherein the notched surface has the same width as the diameter of the shaft member. 4. A clamp body for pivotally supporting said pivot shaft.
The pair of pivot holes are formed as elongated holes that are elongated in the moving direction of the wedge member, and the clamp lever has a clampable position where its output portion projects outside the distal end of the clamp body, and the output portion when the clamp is released. The clamp device according to any one of claims 1 to 3, wherein the clamp device is configured to be switchable to a retracted position where the clamp is retracted into the clamp body. 5. A partial cylindrical seating surface formed at an input portion of a clamp lever of a clamp device, a partial cylindrical surface rotatably engaged with the seating surface, and a notch exposed outside the outer surface of the input portion. Driving to a clamp lever including a shaft member having a surface, and a wedge member having an inclined surface that is in surface contact with a notch surface of the shaft member and inputting a driving force from an actuator to an input unit via the shaft member. In the force input structure, a pair of pivot holes connected to the seat surface are formed at both end portions in the width direction of the input portion, and the pair of pivot holes are formed at both end portions of the shaft member.
A pivot shaft is formed in the pair of pivot holes, and the cutout surface is formed in the shaft member between the pair of pivot shafts. Driving force input structure.