JP2000326166A - Clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance workability at the time of work replacement by letting the clamping part of a clamp arm be positioned to the outside of a work mounting surface, in unclamping, so as to be positioned to a place lower than its height at the time of clamping. SOLUTION: One moving fulcrum 8a is provided in a guide shaft 8 to be moved together with a driving rod 5, and the other fulcrum 4d is provided for a clamp arm 4 to be engaged with a guiding groove 6 engraved so as to be provided for a clamp main body 2, the driving of the clamp arm 4 caused by the up- and-down movement of the driving rod 5, thereby allows the clamp arm 4 to be moved horizontally and vertically while the clamp arm 4 is being kept horizontal. By this constitution, since at the time of unclamping, the clamping part 4b of the clamp arm 4 is positioned at the outside of a work mounting surface 11a, and also positioned at a place lower than its height at the time of clamping, and a work W can be easily mounted to/demounted from a jig 11, so that workability can thereby be enhanced.

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 work to a jig or the like, and more particularly, to a clamp device improved so as not to hinder replacement of the work when unclamping. .

[0002]

2. Description of the Related Art Conventionally, as a clamp device for fixing a work to a jig or the like, a device as shown in FIG. 2 is generally used. That is, the end is rotatably connected to the drive rod 25 by raising the drive rod 25 provided integrally with the piston rod 23 that reciprocates in the axial direction in the cylinder 21 fixed to the clamp body 22. The clamp portion 24a at the other end of the clamp arm 24 rotates clockwise around the fulcrum 24b of the clamp arm 24 to clamp the work W. The fulcrum 24b is a fixed fulcrum 22 fixed to the clamp body 22.
a and a guide arm 26 so as to be rotatable.

[0003]

However, when the drive rod 25 is lowered by the lowering of the piston rod 23, the fixed fulcrum 22a fixed to the clamp body 22
Clamp part 2 of clamp arm 24 because it is fixed
4a rises and stops above the work W. For this reason, at the time of work such as replacement of the work W, the clamp portion 24a of the clamp arm 24 touches the hand and gets in the way, thereby reducing workability. Accordingly, the present invention provides a clamp device having a structure in which the clamp portion of the clamp arm is located outside the work mounting surface and lower than the height at the time of clamping when unclamping, thereby improving workability. The task is to

[0004]

According to a first aspect of the present invention, there is provided a driving rod integrally provided with a piston rod reciprocating in an axial direction in a cylinder, and a clamp body. A guide groove integrally provided, a moving fulcrum that moves together with the drive rod and a locking portion that locks to the clamp body immediately before clamping, and one end slidably engages with the guide groove; It is characterized by comprising a clamp arm that clamps the work at the other end and is driven by the drive rod, and a guide arm that rotatably connects the clamp arm and the movable fulcrum.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a clamp device according to an embodiment of the present invention. In FIG.
The cylinder 1 is fixed to the clamp body 2, and a drive rod 5 for applying a load to the clamp arm 4 when ascending is provided at the tip of a piston rod 3 configured to reciprocate in the axial direction in the silling 1. ing. The drive rod 5 is provided with an arm push-up portion 5a and a collar 5b. The arm push-up portion 5a is formed in a cylindrical shape so as to slidably contact the lower surface of the clamp arm 4, and the collar 5b is rotatably supported by the drive rod 5. One end of the clamp arm 4 engages, via a cam follower 4a, with a guide groove 6 formed in a guide body 12 integrally fixed to the clamp body 2, and a gap is formed between the arm push-up portion 5a and the collar 5b. It is slidably assembled.

The cam follower 4a, like the collar 5b,
It is rotatably supported by the clamp arm 4. A fulcrum 4d is provided between the clamp portion 4b at the other end of the clamp arm 4 and the contact portion 4c of the arm push-up portion 5a, and is rotatably connected to the guide arm 7. The other end of the guide arm 7 is rotatably connected to a moving fulcrum 8 a provided on the upper part of the guide shaft 8. The guide shaft 8 is
It slides in a bearing 9 provided integrally with the clamp body 2, is urged upward by a spring 10, and comes into contact with a stopper 5 c provided integrally with the drive rod 5. At the lower part of the guide shaft 8, a locking portion 8b is provided, and when the driving rod 5 moves up near the clamping position together with the guide shaft 8, the locking portion 8b of the guide shaft 8 is
It is configured to lock with a bearing 9 provided integrally with the clamp body 2. Jig 1 for fixing work W
1 is integrally fixed to the clamp body 2.

Next, the operation of the clamp device according to the present embodiment will be described in detail with reference to FIG. When a clamp switch (not shown) is pressed after the work W is placed on the work mounting surface 11a of the jig 11, pressurized fluid is introduced to the rising side in the cylinder 1 and the driving rod 5 moves up together with the piston rod 3. The drive rod 5 pushes up the clamp arm 4 in contact with the arm push-up portion 5a, and at the same time, the stopper 5c also rises, so that the guide shaft 8 is pushed up by the spring 10, so that the cam follower 4
"a" slides on the lower vertical portion 6a of the guide groove 6, moves in parallel with the guide arm 7 connected to the fulcrum 4d and the movement fulcrum 8a, and moves up. When the cam follower 4a reaches the inclined portion 6b of the guide groove 6, it is pushed rightward in the drawing along the inclined portion 6b, so that the clamp arm 4 moves to the right.

The cam follower 4a is connected to the upper vertical portion 6 of the guide groove 6.
At time point c, the clamp arm 4 reaches a position where the work W is clamped. At this point, the locking portion 8b of the guide shaft 8 comes into contact with the bearing 9. At this point,
A slight gap is left between the clamp portion 4b of the clamp arm 4 and the work W. When the drive rod 5 further moves up, the clamp arm 4 rotates clockwise about the fulcrum 4d, and the clamp portion 4b clamps the work W.
At this time, the cam follower 4a and the end of the guide groove 6 have a certain gap.

When the work on the workpiece is completed and an unclamp switch (not shown) is pressed, pressurized fluid is introduced to the lower side in the cylinder 1 and the drive rod 5 moves down together with the piston rod 3. The collar 5b of the drive rod 5 pushes down the clamp arm 4 and the drive rod 5
The stopper 5c integrally fixed to the guide shaft 8
The guide shaft 8 is pushed down while abutting on. That is, the drive rod 5, the clamp arm 4, the guide arm 7, and the guide shaft 8 integrally descend along the reverse path to the initial position (solid line in the figure). At this time,
The clamp portion 4b of the clamp arm 4 is
It is configured to be located outside of “a” and below the height at the time of clamping. Since the present invention is configured as described above, the clamp arm 4 moves laterally and vertically while maintaining a substantially horizontal position. Therefore, when unclamping, the clamp portion 4b is outside the work mounting surface 11a and Can be stopped below the height at the time of clamping.

[0010]

The present invention has the following effects because it is configured as described above. That is, since the clamp portion of the clamp arm is located outside the work mounting surface and lower than the height at the time of clamping when unclamping, it does not come out on the mounting surface, so the work can be smoothly attached to and detached from the jig. The performance is improved.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a clamp device showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Clamp body 3 Piston rod 4 Clamp arm 5 Drive rod 6 Guide groove 7 Guide arm 8a Moving fulcrum 8b Locking part

Claims (1)

[Claims] 1. A drive rod integrally provided on a piston rod reciprocating in a cylinder in an axial direction, a guide groove integrally provided on a clamp body, a moving fulcrum and a clamp moving together with the drive rod. A locking portion that locks to the clamp body immediately before, a clamp arm driven by the drive rod, one end of which is slidably engaged with the guide groove and the other end of which clamps the work; A clamp device comprising a clamp arm and a guide arm rotatably connecting the movable fulcrum.