JP2802666B2 - Wedge clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a case where a mold of a press machine or an injection molding machine is clamped in a use state or a case where a workpiece to be machined is clamped to a base such as a table. The present invention relates to a clamping device using a wedge used for the present invention.

[Conventional technology]

As a conventional wedge-type clamping device, for example,
There is one disclosed in Japanese Patent Application No. 39128/39. This is a clamp which is supported by the main body so as to rotate and clamps the mold by turning to one side, and a rear surface provided on the main body so as to rotate the clamp to a clamped state by advancing. A pressing piston formed on the first slope and a second slope advancing and retreating across the rear surface of the pressing piston and abutting against the first slope, supporting a surface opposite to the second slope on a plane of the main body; And a moving body moved forward and backward by a tightening cylinder. As the moving body advances, the second slope advances the pressing piston, and the clamp is rotated to be in a clamped state. The second slope is a wedge-operated slope, and the moving body does not recede due to the retreating force of the pressing piston. Therefore, the clamping state is maintained even if the action force of the tightening cylinder is lost after the moving body advances. Is maintained.

In addition, as disclosed in Japanese Patent Publication No. 58-29184, a pressing claw for holding down a mold is provided rotatably, and a wedge member is pushed between a rear portion of the holding claw and a mold mounting board. Some are.

Separately, the clamp device may be provided so as to be retracted so as not to obstruct the insertion / removal of the mold when exchanging the mold or the like.

[Problems to be solved by the invention]

In the conventional wedge-type clamping device, both wedges are designed to slide in a state where both surfaces are in surface contact or one surface is in surface contact and the other surface is in a line or point contact state. Has a very high frictional resistance. This frictional resistance is a loss of force from the drive unit that drives the wedge, and in order to obtain a large output of about 1 to 20 tons as a clamp device for holding a mold, the drive unit is made smaller to obtain a large output. The resulting high pressure hydraulic cylinder had to be used.

Further, in the conventional clamp device which is provided so as to retreat at the time of mold replacement, there is a problem in that the advance / retreat drive device is bulky.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a clamp device having a configuration in which loss of force due to friction for driving a wedge of a wedge-type clamp device is reduced, and the wedge-type clamp device is less likely to be disturbed at the time of mold replacement without retreating as a whole. .

[Means for solving the problem]

Means of the present invention includes a main body of a clamp device fixed to a fixed base for fixing a mold or a workpiece, and a pressing portion for pressing the mold or the workpiece and fixing the fixed body to the fixed base. A press fitting having a driven portion supported by the main body so as to be able to advance and retreat along a circular arc toward a pressed portion such as a mold or a workpiece along a circular arc and rotatably supporting a first roller; By moving the reciprocating drive unit and moving forward with the slope contacting the outer periphery of the first roller, the opposite surface of the slope to the main body via the second roller so that the pressing unit moves forward toward the pressed unit. In a wedge-type clamp device including a supported wedge, the pressing fitting is provided so as to be movable in parallel with the advance / retreat direction of the wedge together with the fulcrum support position with respect to the main body, and moves to an advanced position. When the pressure portion and the pressed portion face each other and move to the retracted position, the moving range is determined so that the pressing portion deviates from the pressed portion facing position, and the pressing fitting is moved to the advanced position with the advance of the wedge. A forward and backward interlocking means is provided so as to move forward and retreat with the retraction of the wedge to the retreat position.

[Action]

By making the driven part of the press fitting driven by the slope of the wedge a rotatable first roller and supporting the surface opposite to the slope of the wedge on the main body via the second roller, Both surfaces are in rolling contact, and the frictional loss of the wedge drive force is almost eliminated.

Further, in a state in which the pressing metal is retracted with the retraction of the wedge, the pressing part is displaced from the position facing the pressed part, so that the mold and the like can be exchanged by moving in a direction perpendicular to the fixed base.

〔Example〕

FIGS. 1 and 2 show the first embodiment. In the figure,
1a is a main body, 2a is a press fitting, 3a is a wedge, 46 is an interlocking means,
4a is a lock device.

The main body 1a has both side walls 10a provided at regular intervals,
It has a block-like shape composed of a connecting portion 11a connecting the side wall portions 10a at the lower portion. This body 1a is on both sides
Fixing bolts 40 penetrating 10a vertically
Is fixed to the base 14. Base 14 is mold
15 is the base to be fixed.

The press fitting 2a is a lever-like thing and is disposed between the side walls 10a, and is rotatably supported by a fulcrum shaft 16a passing through the middle of the press fitting 2a, and the fulcrum shaft 16a is supported by the both side walls 10a. ing. Both ends of the support shaft 16a are formed by notching the upper surface, and are supported by guide grooves 41 along the advance and retreat directions of the wedge 3a on both side walls 10a, so that the fulcrum shaft 16a can advance and retreat a fixed distance together with the press fitting 2a. ing. A pressing portion 17a is formed at the lower left end of the pressing metal fitting 2a, a right rear end is terminated in the main body 1a, and a first roller 18a is rotatably supported by a shaft 19a at the rear end. The lower peripheral surface of the first roller 18a is a driven portion 20 that contacts the slope of the wedge 3a. The range of movement of the pressing fitting 2a is defined by the guide groove 41, and the pressing portion 17a is located at a position facing the pressed portion 38 of the mold 15 at the advanced position, and the pressing portion 17a is pulled into the main body 1a at the retracted position. It is at a position deviated from a position facing the pressed portion 38 in the inserted state. A spring 42, which presses the pressing fitting 2a to the advance position and urges the fulcrum shaft 16a clockwise in FIG. 1 around the fulcrum shaft 16a, is connected to a spring receiver 43 provided at a lower portion of the pressing fitting 2a and the connecting portion 11a of the main body 1a. It is installed between the spring support 44 provided.

The wedge 3a has an air cylinder connected to the rear end of the main body 1a as an advance / retreat drive unit 21a, and has its piston rod 45 connected to the rear end. The wedge 3a is a slope on the top in FIG.
23a, the lower surface on the opposite side of the inclined surface 23a is formed on a flat surface 24a parallel to the advance / retreat direction, and the width dimension in a direction perpendicular to the paper surface is a dimension corresponding to between the two side walls 10a of the main body 1a. You can go back and forth between. A second roller 26a is attached to the main body 1a by a shaft 25a with a wedge 3a sandwiched under the first roller 18a.
And rotatably supported by the flat surface 24a of the wedge 3a. During the retraction of the wedge 3a, the pressing fitting 2a
The interlocking means 46 is provided so as to retreat with the operation.

The interlocking means 46 has a pin 47 planted so as to protrude upward at the tip end of the wedge 3a, and prevents the pressing fitting 2a from being in contact with the pressing fitting 2a when the wedge 3a further moves forward at the position where the pressing fitting 2a has advanced. The pressing fitting 2a is provided with a groove 48, and when the wedge 3a is retracted, the pin 47 is moved to the first roller 18a.
It engages with the front peripheral surface and retreats with the pressing fitting 2a. When the wedge 3a is retracted, the spring 42 is compressed.

The lock device 4a includes a cam lock mechanism provided on both sides of the wedge 3a and a release mechanism. The cam lock mechanism pivots the cams 50 in the hollow portions formed on both side walls 10a of the main body 1a by the shafts 51, respectively, and biases the driving pieces 52 for driving both the cams 50 in the locking directions by the springs 53. Each is provided in both side walls 10a. The release mechanism is
A pin 54 for driving the cam 50 in the unlocking direction is provided by penetrating the side walls 10a back and forth respectively, and a piston 56 for moving the rod cover side of the air cylinder of the advance / retreat driving unit 21a on the rear end of the pin 54 in a short stroke. It is formed and opposed to the second piston 55 having a larger effective pressure receiving area than that of the second piston 55. The rod 45 of the piston 56 of the air cylinder penetrates the second piston 55 slidably and airtightly. When the pressure air is supplied to the front pressure chamber 58 of the piston 55, the second piston 55 moves forward first. Then, the cam 50 is driven via the pin 54 in the unlocking direction. In the figure, 59 and 60 are pressure air supply / discharge ports with a throttle, and 61 is a rear pressure chamber.

In the clamp device of this embodiment, the state in which the wedge 3a is retracted to the right in the drawing is the unclamped state, the leading end portion of the slope 23a of the wedge 3a contacts the first roller 18, and the pressing fitting 2
a is rotated clockwise from the state shown in the figure, and the pressing portion 17a moves upward to the right away from the pressed portion 38 and further moves to the right.
Located within.

When changing from the unclamped state to the clamped state, the advance / retreat drive unit 21a is operated to move the wedge 3a to the left.
At this time, the locking device 4a rotates the cam 50 to the loose side by the advance of the wedge 3a, and the locking of the front side pressure 58 is increased by the presence of the throttle, so that there is no locking action. The press fitting 2a moves forward by the action of the spring 42 with the advance of the wedge 3a. Then, when the fulcrum shaft 16a reaches the front end of the guide groove 41, the advancement of the pressing fitting 2a stops, the engagement of the engaging portion 46 is released, and only the wedge 3a advances. This will result in wedge 3a
The inclined surface 23a pushes up the first roller 18a to rotate the pressing fitting 3a counterclockwise about the fulcrum shaft 16a, and the pressing portion 17a presses the pressed portion 38, resulting in the state shown in FIG. 3a
Stops moving to the clamp state. At this time, the atmospheric pressure acts on the front surface of the second piston 55 and the pressure rises on the rear surface due to the restriction of the port 59, so that the unlocking force through the pin 54 remains until the residual pressure disappears. When the locking force of the spring 53 overcomes, the pressing force of the spring 53
Is turned to the tightening side to be in the locked state, and the clamped state is maintained as it is. The magnitude of the clamping force depends on the forward pressing force of the forward / backward drive unit 21a, the angle of the slope 23a of the wedge 3a, and the fulcrum shaft from the first roller 18a of the pressing fitting 2a.
It is related to the ratio (leverage) between the distance to 16a and the distance from the fulcrum shaft 16a to the pressing portion 17a, and is compared with the conventional wedge type, which has sliding frictional resistance on both sides of the wedge. Thus, the clamping force is several times as high as that of the forward / backward drive unit 21 having a fraction of the output.

To set the unclamping state, the advance / retreat drive unit 21a is operated to move the wedge 3a backward to the right. At this time, since the pressure in the front pressure chamber 58 increases, the second piston 55 advances to rotate the cam 54 to the loose side via the pin 54.
The lock is released and the wedge 3a retreats. When the wedge 3a starts to retreat, first, the pressing fitting 2a is rotated clockwise in FIG. 1 by the action of the spring 42, and the pressing portion 17a is separated upward from the pressed portion 38, and then the engaging portion 46 is moved. When the wedge 3a retreats, the pressing fitting retreats and the main body 1a
And return to the unclamped state.

FIG. 3 shows a second embodiment. This embodiment is different from the first embodiment in that the press fitting 2 is formed by the fulcrum shaft 16a and its guide groove 41.
a, the position of the advancing / retreating position is different, the fulcrum structure by the fulcrum shaft 16a is a different structure, the second roller 26 is a different structure, and the lock device is completely incorporated in the advancing / retracting drive. It is different in that it is.

In the figure, 1b is a main body, 2b is a press fitting, 3b is a wedge,
4b is a lock device.

The main body 1b is in the form of a box-shaped block opened to the front left of the figure, and has two side walls 10b, a bottom wall 11b, a top wall 69, and a rear wall 70.
Consists of

The pressing fitting 2b has a width corresponding to the space between the side walls 10b and the main body 1b.
It has a length that fits almost inside and a top surface that is inclined downward downward at a height that fits leaving a gap on the upper side in its main body 1b, and the left front end is formed in the pressing portion 17b, and the rear end lower surface is formed. The first roller 18b has a fulcrum projecting portion 71, and the first roller 18b is pivoted on the shaft 19b so that the outer peripheral surface slightly projects upward on the upper surface slightly behind the pressing portion 17b.
The upper surface of the first roller 18b is the driven portion 20, and a spring receiver 43b is protruded from the lower surface below the position of the first roller 18b. The spring 42b enters a gap 72 formed by cutting the bottom wall 11b of the main body 1b from the front, and the gap 72 is provided on a rotatable roller 73 provided across the front end side of the main body 1b. And restricts the forward movement of the spring receiver 43b. The right rear part of the gap 72 is formed in a spring receiver 44b, and accommodates a compression spring 42b between the spring receiver 43b, whereby the pressing fitting 2b is pressed to the forward position and clocked against the fulcrum projection 71. Receiving rotational force in the direction.

The wedge 3b has a lower surface formed on an inclined surface 23b, an upper surface formed in a plane parallel to the reciprocating direction, and provided with four second rollers 26b whose peripheral surface protrudes from the upper surface by a predetermined dimension. The second roller 26b is rotatably supported by the wedge 3b by a shaft 74. The wedge 3b has a width corresponding to the interval between the side wall portions 10b and can move forward and backward, the second inclined surface 23b is in contact with the first roller 18b, and the second roller 26b is in contact with the inner surface of the main body upper wall portion 69, The piston rod 27b of the advance / retreat drive unit 21b is connected to the rear end. The forward / backward drive unit 21b uses a commercially available cylinder with a brake. In the drawing, reference numerals 75 and 76 denote forward / backward operation pressure fluid supply / discharge ports, and reference numeral 77 denotes a brake release pressure fluid supply / discharge port. The wedge 3b is provided with a projection 78 on the upper surface of the pressing fitting 2b so that the rear end of the wedge and the convex portion 78 engaging with the wedge 3b are retreated with the pressing fitting 2b in the middle of the retraction.
Is composed.

In the figure, the rear wall portion is connected to the rear end of the pressing
A member 68 which penetrates through 70 so as to be able to advance and retreat is for detecting the advance and retreat position of the press fitting 2b, and drives limit switches 80 and 81.

In this clamp device, the state in which the wedge 3b is receded to the right in the drawing is an unclamped state, the leading end of the slope 23b of the wedge 3b contacts the first roller 18b, and the pressing fitting 2b is more clockwise than in the state shown. The pressing part 17b is rotated in the
It moves upward and further away from 8 and is located inside the main body 1b.

When changing from the unclamped state to the clamped state, the advance / retreat driving unit 21b is operated to move the wedge 3b forward.
At this time, the lock device 4b is supplied with the pressure fluid and is in the unlocked state. Spring 42b with advance of wedge 3b
The press fitting 2b also moves forward by the action of. And spring support 43b
When the roller comes into contact with the roller 73, the pressing metal member 2b stops moving forward, the engaging portion 46b is disengaged, and only the wedge 3b moves forward. As a result, the slope 23b of the wedge 3b is
To rotate the pressing fitting 2b counterclockwise around the fulcrum 71, and the pressing portion 17b presses the pressed portion 38, as shown in the figure, and the wedge 3b stops moving forward and enters the clamped state. . When the pressure fluid is discharged from the port 77 and the locking device 4b is operated after a predetermined time from the detection of the advancement of the pressing fitting 2b by the limit switch 80, the clamped state is maintained. The magnitude of the clamping force is slightly smaller than that of the first embodiment in that the lever ratio is 1 or less.

A third embodiment is shown in FIG. 4 to FIG. In this embodiment, the interlocking means 46 in the first embodiment, the driving unit 21a,
The configuration of the lock device 4a is slightly different from that of the lock device 4a.

In the figure, 1c is a main body, 2c is a press fitting, 3c is a wedge,
46c is an interlocking means, and 4c is a lock device.

The main body 1c has both side walls 10c provided at regular intervals,
It has a block-like shape composed of a connecting portion 11c connecting lower portions between both side wall portions 10c. This body 1c is on both sides
Fixing bolt 40c provided to penetrate 10c vertically
Is fixed to the base 14. Base 14 is mold
15 is the base to be fixed.

The press fitting 2c is a lever-like thing and is disposed between the side walls 10c, and is rotatably supported by a fulcrum shaft 16c penetrating the middle of the press fitting 2c, and the fulcrum shaft 16c is supported by the both side walls 10c. ing. Both ends of the support shaft 16c are formed by notching the upper surface, and are supported by guide grooves 41c along the advancing and retreating direction of the wedge 3c on both side walls 10c, so that the fulcrum shaft 16c can advance and retreat a fixed distance together with the pressing fitting 2c. ing. A pressing portion 17c is formed at the lower left end of the pressing metal fitting 2c, a right rear end is terminated in the main body 1c, and a first roller 18c is rotatably supported by a shaft 19c at the rear end. The lower surface of the first roller 18c is a driven portion 20 that contacts the slope of the wedge 3c. Press fitting
2c has a movable range defined by the guide groove 41c, the pressing portion 17c is located at a position facing the pressed portion 38 of the mold 15 at the forward position, and the pressing portion 17c is retracted into the main body 1c at the retracted position. In the state, it is at a position deviated from a position facing the pressed portion 38. A spring 42c, which presses the pressing fitting 2c to the forward position and urges the supporting shaft 16c in the clockwise direction in FIG. 5 around the fulcrum shaft 16c, has a spring receiver 43c provided below the pressing fitting 2c and a main body 1c.
The spring support 14c is provided between the side wall portions 10c.

The wedge 3c has an air cylinder coupled to the rear end of the main body 1c as the advance / retreat drive unit 21c, and has a piston rod 45c coupled to the rear end. The air cylinder of the forward / backward drive unit 21c is
The piston 56c is urged forward by springs 90 and 91, and the piston 65c is retracted against the springs 90 and 91 by the supply of compressed air from the compressed air supply / discharge port 92. The wedge 3c has an inclined surface 23c on the upper surface in FIG. 5, is formed on a flat surface 24c parallel to the retreating direction on the lower surface opposite to the inclined surface 23c, and has a width dimension in a direction perpendicular to the paper surface of the main body 1c.
It is a dimension that is located with a margin between both side walls 10c of
You can go back and forth between the two. First roller
The second roller 26c is the main body with the wedge 3c sandwiched below the 18c
It is rotatably supported by 1c by a shaft 25c, and is in contact with the flat surface 24c of the wedge 3c. An interlocking means 46c is provided so that the wedge 3c is retracted with the pressing fitting 2c during the retraction.

The interlocking means 46c moves the wedge 3c and the piston rod 45c slidably in the forward and backward directions through the connecting rod 93 and the left end of the connecting rod 93 and the pressing fitting 2c in FIG. A connecting pin 94 movably connected in the direction, a sliding body 95 provided in a piston shape on the right end of the connecting rod 93, and a sliding body 95 provided on the piston rod 45c so as to be slidably accommodated. Inner hole 96. When the piston rod 45c retreats, the sliding body 95 engages with the left end of the inner hole 96 and retreats in the middle of the retreat, and the connecting rod 93 is retracted by the sliding body 95 retreating rearward. The pressing fitting 2c is retracted against the spring 42c through the opening.

The lock device 4c is not specially provided, but is provided with a return spring 90, 91 provided in the cylinder of the retraction drive 21c.
When the supply / discharge port 92 is opened to the atmosphere, the acting force of the springs 90 and 91 continues to press the wedge 3c forward, so that the lock state is established.

In the figure, reference numerals 80c and 81c denote limit switches for detecting the advance / retreat position of the press fitting 2c.

In the clamp device of this embodiment, the state in which the wedge 3c is receded to the right in FIGS. 4 and 5 is the unclamped state, and the leading end side portion of the slope 23c of the wedge 3c contacts the first roller 18c. The pressing fitting 2c rotates clockwise from the state shown in the drawing, and the pressing portion 17c moves upward to the right away from the pressed portion 38 and is located inside the main body 1c, and the sliding body 95 is Inner hole
The left end of the 96 is engaged. This unclamped state is a state in which the supply / discharge port 92 is connected to a source of pressurized air.

When changing from the unclamped state to the clamped state, the advance / retreat drive section 21c is operated, that is, the supply / discharge port 92 is opened to the atmosphere, and the piston 56c, the piston rod 45c, and the wedge 3c are advanced by the action of the springs 90, 91. As the wedge 3c advances, the press fitting 2c receives the action force of the spring 42c, and thus advances with the advance of the wedge 3c. And when the fulcrum shaft 16c reaches the front end of the guide groove 41c, the advancement of the pressing fitting 2c stops,
The engagement between the sliding body 95 and the front end of the inner hole 96 is released, and only the wedge 3c moves forward. This makes the wedge 3c slope
23c pushes up the first roller 18c to move the pressing fitting 3c to the fulcrum shaft 16c.
Rotate counterclockwise about c and press part 17c is pressed part 38
To the clamped state shown in Fig. 5, and the wedge 3c
Stops moving to the clamp state. The magnitude of the clamping force is substantially the same as that of the first embodiment.

To set the unclamping state, the advance / retreat drive unit 21c is operated, that is, the supply / discharge port 92 is connected to the pressure air source, and the piston rod 45c and the wedge 3c are retracted. At this time, the return springs 90 and 91 are compressed. When the wedge 3c starts retreating, first, the pressing fitting 2c is moved to the fifth position by the action force of the spring 42c.
In the figure, the pressing portion 17c is rotated upward in the clockwise direction to move upward from the pressed portion 38, and then the sliding body 95 is moved to the inner hole 9 of the piston rod 45c.
6, the piston rod 45c and the pressing fitting 2c are connected via the connecting rod 93, and the pressing fitting 2c is retracted with the retraction of the wedge 3c and retracted into the main body 1c to be unclamped. Return to

In the above embodiment, the advance / retreat drive units 21a, 21b, and 21c are air cylinders. Alternatively, a hydraulic cylinder or a screw feed type driven by an electric motor to advance and retract the wedge may be used. What is necessary is just to be able to advance and retreat the wedge by a necessary distance by a necessary force. In the case of driving by a motor, it is preferable to lock the rotating part by the motor because it can be locked with a smaller force.

In the third embodiment, the sliding body 95 is formed so as to slide in the inner hole 96 in an airtight manner, and the supply / discharge port 98 is provided so that compressed air can be supplied to the spring chamber accommodating the springs 90 and 91. Can be provided to further increase the tightening force.

〔The invention's effect〕

In the wedge-type clamp device according to the present invention, one surface of both side working surfaces of the wedge is formed in a plane along the reciprocating direction and guided by a roller supported by the main body, or the one surface is used as a roller rolling surface on the main body. Guided on the formed linear guide surface, and the other surface of the wedge is used as an inclined surface, and the pressing bracket is driven via a roller on this inclined surface, so that both sides of the wedge conventionally received sliding friction resistance. Both sides will receive negligible frictional resistance, almost eliminating the sliding frictional resistance that wedges have traditionally received,
In order to obtain a constant pressing force for clamping, the capability of the advance / retreat drive unit can be reduced by the reduction in frictional resistance. This makes it possible to replace the need for hydraulic drive of the clamp device with pneumatic drive.

Further, the clamp device according to the present invention can be in an unclamped state in which the pressing fitting is moved forward and backward and moved to a position deviated from the position facing the pressed portion without moving the entire clamp device. Can be replaced by moving the mold or the like in the direction perpendicular to the mounting surface without using a device for retracting the mold.

Further, as in the first and third embodiments, in the configuration in which the lever ratio of the press fitting can be increased by two to three times, the ability of the forward / backward drive unit can be further reduced.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional side view showing a first embodiment of the present invention,
FIG. 2 is a partial cross-sectional plan view of the first embodiment, FIG. 3 is a partial longitudinal side view showing a schematic configuration of the second embodiment of the present invention, and FIG. 4 is a cross-sectional view showing a third embodiment of the present invention. FIG. 5 is a vertical side view of the third embodiment, and FIG. 6 is a front view of the third embodiment. 1a, 1b, 1c …… Main body, 2a, 2b, 2c …… Pressing bracket, 3a, 3
b, 3c …… Wedge, 4a, 4b, 4c …… Locking device, 14 ……
Fixing base, 15 Mold, 16a, 16b, 16c Support axis, 17a, 17b, 17c Pressing part, 18a, 18b, 18c First
Rollers, 19a, 19b, 19c: shaft, 20: driven part, 21a,
21b, 21c: forward / backward drive unit, 23a, 23b, 23c: slope, 26
a, 26b, 26c: second roller, 41, 41c: guide groove, 46,
46b, 46c ... Interlocking means.

Claims (3)

(57) [Claims] 1. A main body of a clamp device fixed to a fixed base for fixing a mold or a workpiece, and a pressing portion for pressing the mold or the workpiece and fixing to the fixed base. A press fitting having a driven part rotatably supported by the main body and rotatably supporting a first roller, the support being supported by the main body so that the part can advance and retreat along a circular arc toward a pressed part such as a mold or a workpiece; The driving unit is coupled to the main body via the second roller so that the pressing portion moves forward toward the pressed portion by advancing with the slope contacting the outer periphery of the first roller. In a wedge-type clamp device having a wedge provided, the pressing fitting is provided so as to be movable in parallel with the fulcrum support position with respect to the main body and in the retreating direction of the wedge, and the pressing fitting is pressed when moved to an advanced position. Department The moving range is determined so that the pressed portion deviates from the pressed portion opposing position when the pressed portion opposes and moves to the retracted position, and the pressing fitting moves forward with the advancement of the wedge to the advanced position. A wedge-type clamp device comprising forward and backward interlocking means so as to retreat with the retraction of the wedge to the retreat position. 2. The wedge-type clamp device according to claim 1, further comprising a lock device for locking the wedge in an advanced position. 3. The wedge-type clamping device according to claim 1, wherein the forward and backward interlocking means urges the pressing fitting so as to press the pressing fitting to a forward position in the same direction as the forward direction of the wedge. A spring having an action line deviated from the fulcrum position provided between the press fitting and the main body so as to urge in the direction of retreating from the pressed portion, and the press fitting side from the middle of the retraction of the wedge, A wedge-type clamp device, comprising a connecting member connected to a movable portion or a wedge of the reciprocating drive unit and provided so as to retreat against the acting force of the spring.