JP3618263B2 - Clamping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clamping device capable of clamping a workpiece via an arm that rotates by a predetermined angle under the driving action of a driving unit.
[0002]
[Prior art]
Conventionally, when a component such as an automobile is welded, a clamp cylinder is used to clamp the component, and this type of clamp cylinder is disclosed in, for example, US Pat. No. 4,458,889. .
[0003]
In the clamp cylinder disclosed in this U.S. Pat. No. 4,458,889, as shown in FIGS. 13 and 14, a piston rod 2 is disposed between a set of divided bodies 1a and 1b so as to freely advance and retract. A coupling 3 is connected to one end of the piston rod 2. A pair of links 5a, 5b and a pair of rollers 6a, 6b are respectively pivotally attached to both sides of the coupling 3 via a first pin member 4, and further, the pair of links 5a, 5b Between them, the arm 8 is connected via a second pin member 7 so as to be rotatable by a predetermined angle.
[0004]
In this case, the pair of rollers 6a and 6b are slidably provided via a plurality of needles 9a mounted in the holes, and the piston rod 2 is formed in track grooves formed in the bodies 1a and 1b, respectively. Under the guiding action of the rollers 6a and 6b sliding along 9b, the rollers 6a and 6b are provided so as to be displaced integrally.
[0005]
Here, a schematic operation until the clamp cylinder according to the related art shifts from the unclamped state to the clamped state will be described with reference to FIGS. 15 to 17.
[0006]
15 to 17, O ₁ is the center point of the second pin member 7, O ₂ is the center point of the rollers 6 a and 6 b (center point of the first pin member 4), A ₁ to a ₄ is the second pin member 7 center point _{O 1} and the roller 6a of the separation distance in a substantially horizontal direction between the center _{O 2} of _6b, O 1 -O ₂ with the center point _{O 1} and the center point _{O 2} The link pitch, W, which is the linear distance connecting the two, indicates the workpiece.
[0007]
As shown in FIG. 15, in the unclamped state where the arm 8 does not contact the workpiece W, the link pitch O ₁ -O ₂ is greater than the separation distance A ₁ in the substantially horizontal direction between the center point O ₁ and the center point O _2. The relationship of A ₁ <O ₁ -O ₂ is established.
[0008]
Further, as shown in FIG. 16, in the state where the arm 8 is in contact with the workpiece W, the link pitch O ₁ -O ₂ is substantially in the horizontal direction between the center point O ₁ and the center point O ₂ as described above. smaller than the distance _{A 2,} relationship A _{2 <O} 1 -O ₂ holds.
[0009]
Further, as shown in FIG. 17, in the clamped state in which the piston rod 2 is slightly raised and the arm 8 presses the workpiece W downward, the link pitch O ₁ -O ₂ is centered on the center point O _1. It coincides with the distance A ₃ in the substantially horizontal direction from the point O _2, and the relationship A ₃ = O ₁ −O ₂ is established. In this case, the stress N generated by the reaction force of the force with which the arm 8 presses the workpiece W is balanced with the stress F, and the arm 8 is locked.
[0010]
[Problems to be solved by the invention]
However, in the clamp cylinder disclosed in the aforementioned US Pat. No. 4,458,889, the thrust f is larger than the frictional force of the link mechanism, and the piston rod 2 slightly rises from the clamped state. As shown in FIG. 4, the arm 8 slightly rises from the workpiece W and switches from the clamped state to the unclamped state.
[0011]
Accordingly, the link pitch O ₁ -O ₂ is smaller than the separation distance A ₄ between the center point O ₁ and the center point O ₂ in the substantially horizontal direction, and the relationship of A ₄ <O ₁ -O ₂ is established, and the horizontal direction distance _{a 4} is reduced as compared with the distance _{a 3} of the clamp _state, a relationship of a 3> _{a 4.}
[0012]
As a result, when the piston rod 2 moves up and the link pitch gets over the turning point that coincides with the substantially horizontal separation distance between the center point O ₁ and the center point O ₂ , the arm 8 moves backward and slightly moves from the workpiece W. Therefore, there is a problem that the clamped state is released.
[0013]
The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide a clamp device that can prevent the arm from moving backward over a turning point that is in a clamped state.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a body formed in a rectangular parallelepiped shape ,
Driving means for displacing a rod member provided in the body along the axial direction of the body;
A toggle link mechanism that includes a link plate having one end connected to the rod member via a knuckle pin and the other end connected to a support lever via a link pin, and converts the linear motion of the rod member into a rotational motion. When,
An arm connected to the toggle link mechanism and rotated by a predetermined angle under the driving action of the driving means;
A pivot member pivotally supported by the body and contacting a curved surface formed on an end side of a link plate connected to the rod member via the knuckle pin ;
The curved surface of the link plate has a radius of curvature connecting the center point of the link pin gradually increasing from one end portion on the upper side of the link plate toward the other end portion on the lower side of the link plate. It is set as follows.
[0015]
In this case, the rotating member may be constituted by a guide roller pivotally supported by a pin member fixed to the body or a pin member rotatably provided via a bearing member. The drive means includes at least an actuator such as a cylinder.
[0016]
According to the present invention, the curved surface of the link plate that contacts the rotating means has a radius of curvature connecting the center point of the link pin from the one end on the upper side to the other end on the lower side. Since it is set to gradually increase, after reaching the clamped state, the link plate is further prevented from being displaced along the curved surface having a large curvature radius. As a result, the arm is prevented from moving backward and the clamp state is prevented from being released.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the clamping device according to the present invention will be described below and described in detail with reference to the accompanying drawings.
[0018]
In FIG. 1, reference numeral 10 indicates a clamping device according to an embodiment of the present invention. The clamp device 10 includes a body 12 formed in a flat shape, a cylinder portion (drive means) 14 hermetically connected to a lower end portion of the body 12, and a set of substantially circular shapes formed in the body 12. And an arm 20 connected to a rectangular bearing portion 18 projecting outside through the openings 16a and 16b (see FIG. 5).
[0019]
The cylinder portion 14 includes an end block 24 having an oval-shaped recess (not shown) formed on the upper surface portion, and a cylindrical body having an elliptical cross section. Includes a cylinder tube 26 hermetically connected to the bottom surface of the body 12.
[0020]
Further, as shown in FIG. 3, the cylinder portion 14 is connected to a piston 30 that is housed in the cylinder tube 26 and reciprocates along the cylinder chamber 28, and a central portion of the piston 30. And a rod member 32 that is integrally displaced.
[0021]
As shown in FIG. 3, a wear ring 34 and a seal ring 36 are respectively attached to the outer peripheral surface of the piston 30. Further, mounting holes (not shown) are drilled in the four corners of the end block 24, and the end block 24 and the cylinder tube 26 are hermetically sealed to the body 12 through the four shafts 40 inserted through the mounting holes. (See FIGS. 1 and 2). In the body 12 and the end block 24, a pair of pressure fluid inlet / outlet ports 42a, 42b, 44a, 44b for introducing / extracting pressure fluid (for example, compressed air) to / from the cylinder chamber 28 are opposed to each other. It is formed (see FIG. 3).
[0022]
In actual use, a blind plug (not shown) is screwed into any one of the pressure fluid inlet / outlet ports 42a, 44a (42b, 44b), so that the one of the pressure fluid inlet / outlet ports 42a, 44a (42b, 44b) is used in a closed state.
[0023]
As shown in FIG. 5, the body 12 is configured by integrally assembling a first casing 46 and a second casing 48 that are asymmetric. A projecting portion 50 that projects in a substantially horizontal direction and functions as a rod cover is integrally formed at a lower end portion of the first casing 46, and the longitudinal dimension of the second casing 48 is the first casing 46. Compared with the projection portion 50, the projection portion 50 is shortened by the thickness. In this case, as shown in FIG. 5, the body 12 can be easily disassembled by removing the second casing 48 from the first casing 46 without disassembling the cylinder portion 14.
[0024]
In the body 12, as shown in FIG. 5, recesses 52a and 52b respectively formed in the first casing 46 and the second casing 48 (however, the recess 52b has the same configuration as the recess 52a, and is not shown). Chamber 54 is formed, and is provided in the chamber 54 so that the free end of the rod member 32 faces.
[0025]
In this case, the rod member 32 is formed on the inner wall surface of each of the first casing 46 and the second casing 48, and is guided so as to reciprocate linearly by a guide groove 58 in which a knuckle block 56 described later is slidably provided. The A clearance surface 59 is formed on the upper side of the guide groove 58 so that a curved surface 81 of a link plate 72 described later slides smoothly with the guide roller 79 (see FIGS. 10 to 12). A rod packing 60 (see FIG. 3) that surrounds the outer peripheral surface of the rod member 32 is provided in the through hole formed in the protruding portion 50.
[0026]
As shown in FIG. 5, a toggle link mechanism 64 that converts a linear motion of the rod member 32 into a rotational motion of the arm 20 is provided at one end of the rod member 32 via a knuckle joint 62. The knuckle joint 62 includes a knuckle block 56 having a bifurcated portion that is spaced apart by a predetermined interval and branches in parallel, and a knuckle pin 70 that is pivotally attached to a hole formed in the bifurcated portion.
[0027]
As shown in FIG. 5, a groove portion 68 having a T-shaped cross section that engages with the disk-like protrusion 66 of the rod member 32 is formed on the bottom surface of the knuckle block 56 so as to extend in a substantially horizontal direction. Is done. In this case, a predetermined clearance is formed between the protrusion 66 formed integrally with the rod member 32 and the groove 68 and between the knuckle block 56 and the guide groove 58, and the knuckle block 56 is connected to the groove 68. By being provided so as to be slidable in a substantially horizontal direction along the line 68, transmission of a lateral load to the rod member 32 is prevented. In other words, by providing the knuckle block 56 with a degree of freedom, for example, when clamping a workpiece, a lateral load is not applied to the rod member 32, the rod packing 60, etc., and the stroke of the rod member 32 is toggle-linked. It can be efficiently transmitted to the mechanism 64.
[0028]
As shown in FIG. 5, the toggle link mechanism 64 includes a link plate (link member) 72 connected between the two forks of the knuckle joint 62 via the knuckle pin 70, and the first casing 46 and the second casing 48. And a support lever 74 that is pivotally supported by a set of substantially circular openings 16a and 16b.
[0029]
The link plate 72 is interposed between the knuckle joint 62 and the support lever 74 and functions to link the knuckle joint 62 and the support lever 74. That is, the link plate 72 is formed with a pair of holes 76a and 76b that are spaced apart by a predetermined distance, and the rod member 32 can be freely moved via the knuckle pin 70 and the knuckle joint 62 that are axially attached to the one hole 76a. It is connected to the bifurcated portion of the support lever 74 via a link pin 78 that is connected to the end and pivotally attached to the other hole 76b. A curved surface 81 that contacts a guide roller (rotating means) 79 described later is formed at one end of the link plate 72 adjacent to the one hole 76a.
[0030]
The curved surface 81 formed at one end of the link plate 72 has respective curvatures connecting the center point O ₁ of the link pin 78 and the points O ₂ to O _{N + 1 of the} curved surface 81 as shown in FIG. The radius is set to gradually increase. That is, when the arm 20 rotates toward the workpiece side, the _second curvature radius (O ₁ -O ₂ ) formed on the lower side of the first curvature radius (O ₁ -O ₂ ) formed on the upper side of the link plate 72 is increased. O ₁ -O ₃ ) is larger, and further, a third radius of curvature (O ₁ -O ₄ ) is formed larger than the second radius of curvature (O ₁ -O ₃ ), and the radius of curvature gradually decreases toward the lower side. Is set to be large.
[0031]
Therefore, the curved surface 81 from the upper side to the lower side of the link plate 72 has the first curvature radius (O ₁ −O ₂ ) <the second curvature radius (O ₁ ) with respect to the center point O ₁ of the link pin 78. −O ₃ ) <third curvature radius (O ₁ −O ₄ ) <Nth curvature radius (O ₁ −O _{N + 1} ).
[0032]
As shown in FIG. 5, the support lever 74 is formed to protrude in a direction substantially perpendicular to the axis of the rod member 32 and a bifurcated portion in which a hole portion on which the link pin 78 is pivotally attached is formed. A pair of bearings 18 having a rectangular cross-section exposed to the outside from the body 12 and the substantially circular openings 16a and 16b of the body 12 formed adjacent to each other with the two forks therebetween. Circumferential portions 80a and 80b, and a pair of arc-shaped protrusions 82a and 82b that are formed to slightly protrude laterally from the circumferential portions 80a and 80b and are exposed to the outside from the body 12 through the opening 16b. Have. An arm 20 for clamping a workpiece (not shown) is detachably attached to the bearing portion 18.
[0033]
The support lever 74 is provided so as to rotate integrally with the arm 20, and the arcuate protrusions 82 a and 82 b formed on the support lever 74 abut against the plates 84 a and 84 b fixed to the body 12. It functions as a stopper that stops the rotational movement of the arm 20 by contact.
[0034]
The linear motion of the rod member 32 is transmitted to the support lever 74 via the knuckle joint 62 and the link plate 72, and the support lever 74 is supported by a pair of openings 16a and 16b formed in the body 12. The peripheral portions 80a and 80b are provided so as to be rotatable by a predetermined angle with respect to the rotation center.
[0035]
As shown in FIG. 5, rectangular recesses 86 are respectively formed on the side surfaces of the first casing 46 and the second casing 48 constituting the body 12, and the recesses 86 are closed by a pair of cover members 88a and 88b. Is done. The cover members 88a and 88b are detachably attached by a screw member 89. In this case, the bearing portion 18 of the support lever 74 is provided so as to be exposed to the outside through a substantially circular opening 90 formed in a substantially central portion of the cover member 88b.
[0036]
The plates 84 a and 84 b that stop the rotation of the arm 20 are fixed via the screw members 92 by the arcuate protrusions 82 a and 82 b of the support lever 74 coming into contact with the wall surface of the recess 86. .
[0037]
As shown in FIG. 5, the plate 84b (84a) includes a first contact surface 96 with which one end surface 94 of the arc-shaped protrusion 82b (82a) contacts, and the arc-shaped protrusion 82b (82a). A curved surface 102 is formed between the first contact surface 96 and the second contact surface 100 so as to surround the support lever 74. . The one end surface 94 and the other end surface 98 of the support lever 74 are formed so as to be separated by an angle of about 90 degrees. Of course, the spacing angle between the one end surface 94 and the other end surface 98 of the support lever 74 is not limited to 90 degrees.
[0038]
In this case, the set of cover members 88a and 88b is removed from the body 12 and the screw member 92 is loosened, whereby the set of plates 84a and 84b can be easily replaced with other plates (described later). When the pair of cover members 88a and 88b are removed from the body 12, as shown in FIG. 2, one end surface 94 and the other end surface of the arc-shaped protrusion 82b (82a) formed on the support lever 74 are shown. 98 is provided so as to be exposed to the outside (however, one end face 94 is not shown).
[0039]
As shown in FIG. 5, a concave portion 106 having an arcuate cross section is formed on the upper side of the inner wall surface of the first casing 46 and the second casing 48 constituting the body 12. A guide roller 79 that rotates by a predetermined angle by contacting the curved surface 81 of the plate 72 is provided. A pin member 110 that pivotally supports the guide roller 79 is fixed to the hole portion 108 formed in the first casing 46 and the second casing 48, and the through hole of the guide roller 79 extends in the circumferential direction. A plurality of needle bearings 112 are attached along the same. A guide roller 79 is provided so as to rotate smoothly under the rolling operation of the needle bearing 112.
[0040]
7 and 8, the pin member 114 is provided so as to be in direct contact with the curved surface 81 of the link plate 72, and both end portions of the pin member 114 are attached to the cap members 116a and 116b, respectively. A plurality of short needle bearings 118 may be rotatably supported.
[0041]
On the inner wall surfaces of the first casing 46 and the second casing 48, a pair of guide grooves 58, which are formed of square grooves and extend in the vertical direction, are provided so as to face each other. A knuckle block 56 is interposed between the pair of guide grooves 58, and the knuckle block 56 is slidable in the vertical direction under the guiding action of the guide grooves 58.
[0042]
The clamp device 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described.
[0043]
First, the clamping device 10 is fixed at a predetermined position via a fixing means (not shown), and one end of a tube body such as a tube (not shown) is connected to a set of pressure fluid inlet / outlet ports 42a and 44a (42b and 44b). The other end of the tube is connected to a pressure fluid supply source (not shown). FIG. 9 shows the unclamped state, and FIG. 3 shows the clamped state. Hereinafter, the unclamped state of FIG. 9 will be described as the initial position.
[0044]
After the preparatory work as described above, at the initial position shown in FIG. 9, a pressure fluid supply source (not shown) is energized and the pressure fluid ( For example, compressed air) is introduced. The piston 30 is pressed under the action of the pressure fluid introduced into the cylinder chamber 28, and the piston 30 rises along the cylinder chamber 28.
[0045]
The linear motion of the piston 30 is transmitted to the toggle link mechanism 64 via the rod member 32 and the knuckle joint 62, and converted into the rotational motion of the arm 20 under the rotational action of the support lever 74 constituting the toggle link mechanism 64. Is done.
[0046]
That is, a force that presses the knuckle joint 62 and the link plate 72 engaged with the free end of the rod member 32 upward is applied by the linear motion (rise) of the piston 30. The pressing force against the link plate 72 rotates the link plate 72 by a predetermined angle with the knuckle pin 70 as a fulcrum, and also rotates the support lever 74 in the direction of arrow A under the link action of the link plate 72.
[0047]
Accordingly, when the arm 20 rotates by a predetermined angle in the direction of arrow B with the bearing portion 18 of the support lever 74 as a fulcrum, the arcuate protrusion 82b (82a) integrally rotates with the support lever 74 at a predetermined angle. Move.
[0048]
When the arm 20 is thus rotated in the direction of arrow B, the curved surface 81 of the link plate 72 contacts the guide roller 79 and contacts the curved surface 81 as shown in FIG. The guide roller 79 rotates around the pin member 110 while maintaining the state. In this case, the guide roller 79 is in contact with a point O ₂ of the curved surface 81 formed on the upper side of the link plate 72, further, times gradually along the bottom side of the curved surface 81 of radius of curvature is set larger Move.
[0049]
Further, the arm 20 is rotated so that the one end surface 94 of the arc-shaped protrusion 82b (82a) contacts the first contact surface 96 of the plate 84b (84a) fixed to the body 12, whereby the arm 20 is moved. The rotation operation is stopped (see FIG. 11). After the arm 20 stops rotating and the arm 20 comes into contact with the workpiece, the piston 30 and the rod member 32 are further raised slightly, so that the workpiece is pressed against and held by the arm 20. (See FIG. 3 and FIG. 13).
[0050]
On the other hand, in the state shown in FIG. 3, the piston 30 is lowered by supplying the pressure fluid to the pressure fluid inlet / outlet port 42a under the switching action of a switching valve (not shown). Further, the support lever 74 is rotated in the direction opposite to the above through the link plate 72 under the lowering action of the rod member 32, whereby the arm 20 is rotated in a direction away from the workpiece.
[0051]
When the arm 20 is rotated in a direction away from the workpiece, the other end surface 98 of the arc-shaped protrusion 82b (82a) contacts the second contact surface 100 of the plate 84b (84a) fixed to the body 12. As a result of the contact, the arm 20 stops rotating. As a result, the clamping device 10 returns to the initial position shown in FIG.
[0052]
Next, a description will be given of the point of preventing the turning point that is in the clamped state from being overcome after the workpiece is clamped.
[0053]
In the clamp cylinder according to the prior art, as shown in FIG. 18, after the workpiece is clamped, the piston rod 2 rises further over the turning point, so that the arm 8 moves backward to be separated from the workpiece and is clamped. There is a problem that is released.
[0054]
On the other hand, in this embodiment, as shown in FIG. 12, in the clamped state, the guide roller 79 contacts the point O ₄ of the curved surface 81, and the center point O ₁ of the link pin 78 and the point O ₄ is a substantially horizontal state. Therefore, the reaction force N received by the guide roller 79 and the reaction force F acting in the opposite direction to the reaction force N are in a balanced lock state.
[0055]
In this case, even if the thrust f becomes larger than the frictional force of the toggle link mechanism and the knuckle block 56 tries to further rise, the curvature radius of the curved surface 81 of the link plate 72 gradually increases from the upper side toward the lower side. Therefore, the knuckle block 56 can be reliably prevented from rising from the clamped state.
[0056]
That is, in the clamped state a turning point, the guide roller 79 is in contact with the point O ₄ of the curved surface 81, the curvature radius of curvature of the point O ₄ of the lower side of the curved surface 81 than the point O ₄ Since it is larger than the radius, the knuckle block 56 is prevented from ascending and prevented from overcoming the turning point. Therefore, in the present embodiment, it is possible to reliably prevent the arm 20 from moving backward over the turning point and releasing the clamped state.
[0057]
In the present embodiment, the cylinder is used as the driving means, but the present invention is not limited to this, and the rod member 32 may be displaced using a linear actuator, an electric motor, or the like (not shown). .
[0058]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0059]
That is, it is possible to reliably prevent the arm from moving backward over the turning point in the clamped state. Therefore, once clamped work is not dropped, the clamped state can be stably held.
[Brief description of the drawings]
FIG. 1 is a perspective view of a clamp device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a state where a cover member is removed from the body of the clamp device.
FIG. 3 is a longitudinal sectional configuration diagram taken along line III-III in FIG. 1;
4 is a cross-sectional configuration diagram taken along the line IV-IV in FIG. 3;
FIG. 5 is an exploded perspective view of a body constituting the clamp device.
FIG. 6 is a front view of a link plate showing a curvature radius of a curved surface.
FIG. 7 is a partial cross-sectional configuration diagram showing a modified example of the guide roller.
8 is a cross-sectional configuration diagram taken along line VIII-VIII in FIG. 7;
FIG. 9 is an operation explanatory diagram when the arm is in the initial position.
FIG. 10 is an operation explanatory view showing a state in which the arm rotates from the initial position and the link plate comes into contact with the curved surface of the guide roller.
11 is an operation explanatory view showing a state in which the link plate is further displaced along the curved surface of the guide roller in the state shown in FIG.
FIG. 12 is an operation explanatory diagram in a state where a workpiece is clamped.
FIG. 13 is an exploded perspective view of a main part of a clamp cylinder according to a conventional technique.
14 is a partial cross-sectional side view of the clamp cylinder shown in FIG. 13;
15 is an operation explanatory view of the clamp cylinder shown in FIG.
16 is an operation explanatory diagram of the clamp cylinder shown in FIG. 13;
17 is an operation explanatory diagram of the clamp cylinder shown in FIG. 13;
18 is an operation explanatory view of the clamp cylinder shown in FIG. 13. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Clamping device 12 ... Body 14 ... Cylinder part 16a, 16b, 90 ... Opening part 18 ... Bearing part 20 ... Arm 52a, 52b, 86 ... Recessed part 24 ... End block 28 ... Cylinder chamber 30 ... Piston 32 ... Rod member 42a, 42b, 44a, 44b ... Pressure fluid inlet / outlet ports 46, 48 ... Casing 54 ... Chamber 56 ... Knuckle block 64 ... Toggle link mechanism 66 ... Projection 70 ... Knuckle pin 72 ... Link plate 74 ... Support lever 78 ... Link pin 79 ... Guide Roller 81 ... curved surface 110, 114 ... pin member 112, 118 ... needle bearing

Claims (4)

A body formed in a rectangular parallelepiped shape ;
Driving means for displacing a rod member provided in the body along the axial direction of the body;
A toggle link mechanism that includes a link plate having one end connected to the rod member via a knuckle pin and the other end connected to a support lever via a link pin, and converts the linear motion of the rod member into a rotational motion. When,
An arm connected to the toggle link mechanism and rotated by a predetermined angle under the driving action of the driving means;
A pivot member pivotally supported by the body and contacting a curved surface formed on an end side of a link plate connected to the rod member via the knuckle pin ;
The curved surface of the link plate has a radius of curvature connecting the center point of the link pin gradually increasing from one end portion on the upper side of the link plate toward the other end portion on the lower side of the link plate. A clamping device characterized by being set as follows. The apparatus of claim 1.
The said rotation member consists of a guide roller pivotally supported by the pin member fixed to the body so that rotation is possible. The apparatus of claim 1.
The said rotation member consists of a pin member rotatably provided through the bearing member, The clamp apparatus characterized by the above-mentioned. 2. The clamping device according to claim 1, wherein the driving means includes at least a cylinder.

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