JPH04111735A - Clamping device for workpiece - Google Patents

Abstract

PURPOSE:To cope with a workpiece of various shapes with replacement of a receiving base only required by arranging a displaceable holding member above the receiving base, whose upper surface is formed by copying a lower surface shape of the workpiece, and mounting an expansion bag, possible to extend and contract, to a lower surface of the holding member. CONSTITUTION:An air cylinder 4 is pivotally support-connected by a pin to a rear surface of a bed 1, and a point end of a piston rod 4a is pivotally support-connected to a rear end of a lever 2 by a pin 6. For instance, a rubber- made expansion bag 8 is mounted to an internal surface of a guide member 7, fixedly provided in a front end part lower surface of the lever 2, and connected to a pump 10 and a relief valve 11 through a switching valve 9. A plurality of receiving bases 12 are movably arranged in right/left directions on an upper surface of the bed 1, and upper surfaces of these receiving bases 12 are formed by copying a lower surface shape of a workpiece W. The receiving base 12, corresponding to the workpiece W, is moved to a position below the lever 2 to place the workpiece W on the upper surface, and the workpiece W is pressed to the receiving base 12 and clamped by inflating the expansion bag 8 after the lever 2 is horizontally positioned.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a workpiece clamping device.

b. Prior Art Conventionally, when processing or assembling a workpiece, a lamp device as shown in FIG. 3 has been used to fix the workpiece W.

In this device, a lever b is rotatably supported on a head a, and when a workpiece W is placed on a cradle C and the lever b is rotated in the direction of the arrow in the figure, a pressing force provided on the lower surface of the lever b is pressed. The member d presses the workpiece W against the pedestal C.

C1 Problem to be Solved by the Invention By the way, in this type of lamp device, the pedestal C and the pressing member d are made to correspond to the shape of the workpiece W, so it is difficult to deal with other workpieces W having different shapes. Can not do it. For this reason, a dedicated device is required for each workpiece, leading to a significant increase in costs, especially in rondo machines that produce a wide variety of products in small quantities.

Furthermore, since the workpiece W is pressed against the pedestal C by the pressing member d, there is also a drawback that the surface of the workpiece W is easily scratched.

d. Means for Solving the Problems The present invention aims to solve these problems, and its gist is to provide a pedestal whose upper surface is formed to follow the shape of the lower surface of the workpiece, and a pedestal whose upper surface is formed to follow the shape of the lower surface of the workpiece. A workpiece clamping device is characterized by comprising a displaceable holding member disposed above and a retractable expansion bag attached to the lower surface of the holding member.

Examples of the present invention will be described below.

FIG. 1 shows a clamping device according to the invention.

In the same figure, ▪ indicates a head, and the lower end of a T-shaped lever 2 serving as a holding member is pivotally connected to the upper surface of the head by a pin 3. Further, an air cylinder 4 is pivotally connected to the rear surface of the head 1 by a pin 5, as shown in FIG. It is a support joint.

A guide member 7 is fixed to the lower surface of the front end of the lever 2, and an expansion bag 8 made of, for example, rubber is attached to the inner surface of the member 7. The expansion bag 8 is connected to a pump 10 and a relief valve 11 via a switching valve 9.

When the valve 9 is activated, air is supplied to the expansion bag 8 from the pump 10, and when the valve 9 is not activated, the air in the expansion bag 8 is released into the atmosphere from the relief valve 11. On the other hand, on the top surface of the head 1, a plurality of pedestals 12 are disposed so as to be movable in the left-right direction (directions of arrows A and B in the figure). It is formed. Further, a store 13 is provided upright on the upper surface of the head 1, and when the air cylinder 4 is activated, the reno \-2 comes into contact with the upper end of the stomper 13 and is kept horizontal. .

Next, the operation of this clamp device will be explained.

In advance, both the air cylinder 4 and the switching knob 9 are set in a non-operating state. At this time, the Leno\-2 is tilted forward as shown by the two-dot chain line in FIG. 2, and the inflation bag 8 is in a slightly inflated state.

First, the pedestal 12 corresponding to the workpiece W to be clamped is moved to below the lever 2, and then the workpiece W is placed on the upper surface thereof. Next, the air cylinder 4 is operated to make the reno 2 horizontal, and then the switching valve 9 is put into operation. Then, the expansion bag 8 expands and presses the workpiece W against the receiving table 12, so that the workpiece W is clamped. In addition, when removing the workpiece W from the apparatus, the above-mentioned procedure may be performed in reverse.

In this embodiment, the pedestal 12 is formed so that its entire upper surface comes into contact with the lower surface of the workpiece W.
There is no problem even if a gap is partially formed between the pedestal 12 and the workpiece W to the extent that it does not hinder the clamping of the workpiece.

e. Effects of the Invention According to the present invention, it is possible to handle workpieces of various shapes simply by replacing the pedestal, which is advantageous in terms of cost.

Further, since the workpiece W is pressed against the pedestal by the expansion bag, there is an advantage that the surface of the workpiece is less likely to be damaged.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an apparatus according to the present invention, FIG. 2 is a side view of the same apparatus, and FIG. 3 is a diagram showing a conventional example corresponding to FIG. 2. 1...Het, 2...Reno-14
...Air cylinder, 7.Guide member, 8.
...Inflation bag, 9...Switching knob, 10
... Ponbu,
11...Lili-fu noi-rufu.

Claims (1)

[Claims] The present invention is equipped with a pedestal whose upper surface follows the shape of the lower surface of the workpiece, a displaceable holding member disposed above the pedestal, and an expandable expansion bag attached to the lower surface of the holding member. Features: Workpiece clamping device.