JPH06262474A - Clamp device - Google Patents

Abstract

PURPOSE:To eliminate a trouble of catching a clamper lower jaw by a workpiece, when a clamp device is moved, by providing a stopper for positioning a clamping surface of the clamper lower jaw placed in a position a little lower than a pass line of the workpiece, at the time of unclamping the workpiece. CONSTITUTION:In this clamp device 25 for positioning a prescribed location of a workpiece in a work position of a work machine by horizontally moving the workpiece while clamped, the device has a vertically openable/closable clamper upper jaw 45 and a lower jaw 43, to actuate the upper jaw 45 opened/ closed relating to the lower jaw 43 by actuating a clamping cylinder 39. In the clamp device 25, at unclamping time with no supply of compressed air, upper/lower piston rods 41A, 41B are spread to be opened by a spring 41C, and art upper surface of a head part 41Ah of the upper rod 41A is brought into contact with a lower surface of a stopper 49 in a side of a clamp base 33. In this way, a clamping surface of the clamper lower jaw 43 is positioned so as to come in a position a little lower than a pass line of the workpiece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device used in a processing machine such as a turret punch press to horizontally move a work while gripping the work to position a predetermined portion of the work at a processing position of the processing machine. .

[0002]

2. Description of the Related Art Conventionally, in a processing machine such as a turret punch press, a clamping device is used for gripping a workpiece, horizontally moving it on a processing table, and positioning it so that a predetermined portion comes to the processing position of the processing machine. However, in the conventional clamping device 101, as shown in FIG.
Pin 10 so that 5 can be opened and closed clamped and unclamped
7. The main body side of the clamp cylinder (not shown) is connected and fixed to the clamper lower jaw 103, the clamper upper jaw 105 is connected to the piston rod (not shown), and the clamp rod moves up and down. In order to clamp, the clamping cylinder is driven to push the piston rod upward to raise the rear end of the clamper upper jaw 105, and the other end is clamped to the clamper lower jaw. It was made to close with respect to 103, and the edge part of the work was grasped between the upper and lower clamper jaws 103 and 105.

[0003]

However, in such a conventional clamp device, the clamp cylinder is fixed to the fixing member, and the clamper lower jaw 103 connected to the clamp cylinder is flush with the pass line P. Since the clamper upper jaw 103 is fixed at such a position as described above, and only the clamper upper jaw 103 is adapted to be opened and closed and unclamped by the operation of the piston rod, there are the following problems. That is, when the clamp device is horizontally rotated to the avoidance state as shown in FIG. 7, or conversely to return from the avoidance state to the clamp state, the work A is warped as shown in FIG. The warp A causes the lower jaw 103 of the clamper to be caught on the work W, and there is a problem that smooth avoidance and return operation cannot be performed.

The present invention has been made in view of the above conventional problems, and provides a clamping device capable of smoothly avoiding, returning and clamping even if the end portion of a work is slightly deformed. The purpose is to

[0005]

According to the present invention, an upper jaw of a clamper and a lower jaw of a clamper are connected so as to be vertically opened and closed for clamping and unclamping, and a rear end side of the upper jaw of the clamper is a piston rod of a clamping cylinder. In the clamping device, the lower jaw of the clamper is connected to the clamping cylinder, the piston rod is driven by the clamping cylinder, and the upper jaw of the clamper is opened and closed relative to the lower jaw of the clamper. It is installed so that it can be moved slightly up and down with respect to the fixed member, and is provided with a stopper for catching the clamp cylinder or clamper lower jaw when the clamper lower jaw is lowered to a position slightly lower than the pass line. is there.

[0006]

In the clamp device of the present invention, the clamp cylinder is attached to the fixing member in a state in which it can be moved slightly up and down, and when the clamp cylinder is lowered to a position slightly lower than the pass line, the clamp cylinder is lowered. By providing a stopper that receives the work cylinder or clamper lower jaw, the gripping surface of the clamper lower jaw is positioned by the stopper at a position slightly lower than the work pass line in the unclamped state where the work is not clamped. Even if some deformation occurs, the clamper lower jaw does not get caught on the edge of the deformed work when the clamp device horizontally rotates from the avoidance state to return to the clamp position, so smooth avoidance and return It becomes possible to operate.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, Fig. 1 shows the overall structure of the turret punch press.
2 will be described with reference to FIG. 2, a frame 3 is integrally formed on a base 1 in a mold. Upper and lower turrets 5 and 7 are rotatably arranged on one side inside the frame 3. A large number of metal molds 9 are attached to the upper and lower turrets 5 and 7 in pairs. The upper and lower turrets 5 and 7 are synchronously rotated by a turret drive motor 11 so that a desired die 9 can be positioned at a position directly below the striker 13 which is a processing position.

A carriage device 15 is arranged on the other side inside the frame 3. This carriage device 15
A carriage base 19 that is reciprocally driven in the X-axis direction that is the left-right direction in FIG. 1 by a base drive motor 17 and a carriage drive motor 21 attached to the carriage base 19 is a front-back direction Y in FIG. The carriage 23 is reciprocally driven in the axial direction. A clamp device 25 is attached to the carriage 23, and the work W is gripped by the clamp device 25.

In order to support the work W, as shown in detail in FIG. 2, a fixed table 27 is provided at the center of the inside of the frame 3 so as to be fixed on the base 1, and on both sides of the fixed table 27 together with the carriage base 19 in the X-axis direction. A movable table 29 that reciprocates is provided. A repositioning table 31 is provided near the turrets 5 and 7.

In the turret punch press having such a structure, the upper and lower turrets 5 and 7 are fitted with a large number of a pair of upper and lower molds 9 which are appropriately combined, and the mold 9 having a shape to be performed is the processing position P. The turret drive motor 11 is rotated by a predetermined angle to index the position directly below the striker 13, whereby the upper and lower turrets 5 and 7 are rotated by a predetermined angle, and the desired die 9 is positioned at the processing position P. Further, the work W is gripped by the clamp device 25 and the base drive motor 17 is driven to move the carriage base 19 in the X-axis direction. The carriage drive motor 21 is driven with respect to the carriage base 19 to clamp the carriage 23. It is moved in the Y-axis direction together with the device 25, and the part of the workpiece W to be machined is positioned at the machining position P by these XY two-dimensional movements. After that, the striker 13 is pressed against the head portion of the upper mold by a ram mechanism (not shown),
Punching of a desired shape is performed between the upper and lower molds.

A clamping device according to an embodiment of the present invention used in such a turret punch press is shown in FIGS. 3 and 4. That is, a clamp base 33 is provided to fix the carriage 23 at a predetermined position, and the entire clamp device 25 is attached to the clamp base 33.

The clamp device 25 is attached to a clamp base 33 as a fixing member so as to be able to move up and down slightly, a clamp cylinder 39 housed in the clamp case 37, and a clamp cylinder. 39 and a piston rod 41 housed in 39.

The rear end of the clamper lower jaw 43 is connected to the lower end of the clamp cylinder 39 so as to be substantially horizontal, and the rear end of the clamper upper jaw 45 is pinned to the lower end of the piston rod 41. 47 is loosely coupled.

The piston rod 41 housed inside the clamping cylinder 39 includes an upper rod 41A, a lower rod 41B, and a spring 41C interposed therebetween.
It consists of The upper rod 41A and the lower rod 41B of the piston have a central portion of the upper rod 41A and a lower rod 41A.
It has a double structure in which B penetrates, and as will be described later, the spring 41C is compressed by air pressure, and conversely, the repulsive force of the spring 41C widens the mutual distance so that they slide up and down. .

A head portion 41Ah of the piston upper rod 41A exposed upward from the cylinder 39 is bulged so as to have a large diameter, and a stopper 39A provided at the upper end surface of the cylinder 39 as shown in FIG. The lower surface side of the stopper 39A is received so that the stopper 39A does not enter the cylinder 39. Further, the head portion 41Ah of the piston upper rod 41A is received on the upper surface side by a stopper 49 attached to the upper portion of the clamp base 33 as a fixing member as shown in FIG. It does not move. Therefore, when the vertical width h of the head 41Ah of the piston upper rod 41A is set to be the distance D between the stoppers 49 and 39A, the movable stroke S of the piston upper rod 41A is S = D-h. Usually, this h, that is, the vertical width of the head portion 41Ah is preferably not too large for the stability of the clamp operation, and is preferably about 1 mm.

The clamping cylinder 39 has air chambers 39a and 39b formed at two upper and lower positions.

Next, the operation of the clamp device having the above structure will be described. At the time of unclamping in which compressed air is not supplied to the clamping cylinder 39, the upper and lower piston rods 41A and 41B are expanded by the repulsive force of the spring 41C as shown in FIG. The upper surface of the head portion 41Ah comes into contact with the lower surface of the stopper 49 on the clamp base 33 side, and with this as a reference, the force of the spring 41C causes the piston lower rod 41 to move.
B receives the force of being pushed down, and as a result,
The rear end of the clamper upper jaw 45, which is connected to the lower end of the piston lower rod 41B, is also pushed down, and conversely, the front end of the clamper upper jaw 45 is opened to the unclamped state with respect to the clamper lower jaw 43.

In this unclamped state, the cylinder 39 itself is also pressed downward by the spring 41C and the lower rod 41B with respect to the piston upper rod 41A, and as a result, a slight vertical movement occurs. The cylinder 39, which is attached in a possible state, is also pushed downward by approximately h, and the lower clamper jaw 43 connected to the lower end of the cylinder 39 is also moved to the pass line P.
Will be moved downward by about h. Therefore, when the entire clamp device 25 is rotated to the avoidance position in this unclamping state, or conversely, to rotate the clamp device 25 to return from the avoidance position, the work W on the pass line P is slightly warped downward, Even if there is deformation, the upper and lower clamper jaws 43 and 45 can be smoothly rotated without being caught.

Next, the operation of clamping the work W by the upper and lower clamper jaws 43 and 45 from the unclamped state shown in FIG. 3 to the clamped state shown in FIG. 4 will be described. The upper and lower air chambers 39a and 39b of the cylinder 39 will be described.
Press air into. This causes the piston upper rod 41A to move the spring 4 by the air pressure in the upper air chamber 39a.
The head 41Ah is pushed down against the force of 1C and descends to a position where the lower surface of the head 41Ah abuts the stopper 39A above the cylinder 39. Then, the piston lower rod 41B is pushed up against the force of the spring 41C by the air pressure in the lower air chamber 39b. As a result, the piston lower rod 41B
Of the lower air chamber 39b, the rear end portion of the clamper upper jaw 45 is also pulled up, and conversely, the front end portion of the clamper upper jaw 45 is moved upward.
3, the work W is clamped by the clamping force which is almost equal to the repulsive force of the spring 41C.

As described above, in the clamp device of this embodiment, the upper jaw of the clamper is opened / closed and unclamped with respect to the lower jaw of the clamper, and the lower jaw of the clamper can be slightly moved up and down to avoid it. The warp portion of the work W is prevented from being caught during the operation and the return operation from the avoidance state, so that the avoidance operation and the return operation can be smoothly performed.

The present invention is not limited to the above embodiment, but may have the configuration shown in FIG. That is, a tapered jaw support port portion 53 is formed on the front surface side of the clamp base 51, and the inclined rear end portions 55a and 57a of the upper and lower clamper jaws 55 and 57 are inserted into the jaw support port portion 53, respectively. It is supported so that it can slide in the left and right directions.
Then, a spreading spring 59 is inserted between the facing surfaces of the upper and lower clamper jaws 55, 57. Then, the clamp base 51 is connected to the piston rod 6 of the cylinder device 61.
3, and can be driven in the left-right direction in the figure.

In the clamp device thus configured, in the unclamped state, the cylinder device 61 exerts a force so as to pull the piston rod 63 into the cylinder device 61, thereby moving the clamp base 51 to the right in the figure. As a result, the rear end portions of the upper and lower clamper jaws 55, 57 are supported by the wide exit side of the jaw support opening portion 53 of the clamp base 51, and the spring 59 pushes the upper and lower ends of the clamper jaws 55, 57 up and down. Becomes In this case, the upper and lower clamper jaws 55 and 57 move up and down with respect to the pass line P by substantially the same amount, and only the lower jaw of the clamper is fixed on the pass line as in the conventional case, and the work piece warps. The problem of being caught does not occur.

When clamping, the cylinder device 61
Is driven to drive the piston rod 63 so as to push it to the left side in the figure, whereby the clamp base 51 is also moved to the left. This allows the upper and lower clamper jaws 55,
The rear end portion of 57 is held deep inside the jaw support port portion 53, and the width between the upper and lower facing surfaces is narrowed against the force of the spring 59, and the work W is clamped. Also in this case, since the upper and lower clamper jaws 55 and 57 move from the upper and lower sides by the same amount,
The work W can be clamped just on the pass line P.

[0024]

As described above, according to the present invention, the clamp cylinder is attached to the fixing member in a state in which it can be slightly moved up and down, and the clamp cylinder is located at a position slightly lower than the pass line with respect to the clamper lower jaw. A stopper is provided to receive the clamp cylinder or clamper lower jaw when it descends.Therefore, in the unclamped state where the workpiece is not clamped, the gripping surface of the clamper lower jaw is positioned by the stopper at a position slightly lower than the workpiece pass line. Even if the work is slightly deformed, the clamper lower jaw does not get caught on the edge of the deformed work when the clamp device horizontally rotates from the avoidance state to return to the clamp position. It enables smooth avoidance and return operation.

[Brief description of drawings]

FIG. 1 is a perspective view of a general turret punch press.

FIG. 2 is a plan view of a table portion of the turret punch press.

FIG. 3 is a sectional view of an embodiment of the present invention in an unclamped state.

FIG. 4 is a sectional view of the above-described embodiment in a clamped state.

FIG. 5 is a front view of another embodiment of the present invention.

FIG. 6 is a front view of a conventional example.

FIG. 7 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Base 3 Frame 5 Upper Turret 7 Lower Turret 9 Mold 13 Striker 15 Carriage Device 25 Clamp Device 33 Clamp Base 35 Clamp Case 39 Clamping Cylinder 39A Stopper 39a Air Chamber 39b Air Chamber 41 Piston Rod 41A Piston Top Rod 41B Piston Lower Rod 41C Spring 41Ah Head 43 Clamper Lower Jaw 45 Clamper Upper Jaw 49 Stopper

Claims (1)

[Claims] 1. A clamper upper jaw and a clamper lower jaw are connected so as to be vertically openable and closable for clamping and unclamping, and a rear end side of the clamper upper jaw is connected to a piston rod of a clamp cylinder. A clamping device in which a jaw is coupled to the clamping cylinder, the piston rod is driven by the clamping cylinder, and the clamper upper jaw is opened and closed with respect to the clamper lower jaw, wherein the clamp cylinder is It is attached to the fixing member so that it can move up and down slightly, and a stopper is provided to receive the clamp cylinder or clamper lower jaw when the clamper lower jaw is lowered to a position slightly lower than the pass line. Clamp device consisting of.