JPH0611727Y2 - Work clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Use) The present invention relates to a work clamp device, and more particularly to a work clamp device capable of stably gripping a work in a processing machine.

(Prior Art) In a processing apparatus for processing a work plate material, generally, the work is grasped on a table and moved two-dimensionally in the XY axis directions.
A work clamp device is provided for positioning the desired position under the working head.

In such a conventional work clamp device, the lower jaw is integrally attached to the lower part of the cylinder body attached to the work clamp body, while the upper jaw is pivotally supported at the lower end of the piston rod driven by the cylinder body to By driving the rod, the upper jaw is brought closer to the lower jaw by the action of the lever, and the work end portion is clamped from above and below. Especially in the case of a processing machine such as a punch press, it is necessary to vertically position the work piece on the die, so it is necessary to move the upper and lower jaws and the cylinder body up and down with respect to the clamp body. A ball bearing is interposed between the body and the clamp body so that the cylinder body can move up and down smoothly.

However, in the case of such a conventional work clamp device, there is a problem that a force in the direction of rotation around the ball bearing acts on the cylinder body and the upper and lower jaws when the work is moved, which deteriorates the positioning accuracy. It was Therefore, in order to solve such a problem, it has been proposed to adjust the distance between the clamp body and the upper and lower jaws with a tie rod screw, but in such a configuration, the operation of the upper and lower jaws is hindered. There was also a problem that they would be caught.

(Problems to be Solved by the Invention) As described above, in the conventional work clamp device, when the work is moved, a rotational force centering on the ball bearing acts on the cylinder and the upper and lower jaws, which deteriorates the positioning accuracy. was there.

Therefore, the work clamp device of the present invention has been made in view of such a conventional problem, and it is possible to prevent positional deviation of the clamp jaw portion with respect to the clamp main body in the rotation direction and improve the work positioning accuracy. An object of the present invention is to provide a work clamp device that can be used.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a clamp main body mounted on a carriage movable in the X-axis direction, in which a cylinder main body is vertically movable, A work clamp device in which an upper jaw that clamps a workpiece from above and below in cooperation with a lower jaw fixed to the cylinder body is connected to a piston rod that is vertically movable in the cylinder body,
Restriction guide devices for guiding the vertical movement of the lower jaw with respect to the clamp body and restricting the horizontal rotation of the lower jaw with respect to the clamp body are provided at a plurality of positions of the clamp body. The guide member is in contact with both side surfaces of the lower jaw.

The regulation guide device is provided with an adjusting knob having an eccentric cam portion rotatably fixed to the clamp body, and the eccentric cam portion being rotatably provided with a roller as a guide member.

(Embodiment) FIG. 4 and FIG. 5 show the whole punch press in which the work clamp device of one embodiment of the present invention is implemented. A desired processing position is positioned between the punch 1 and the die 3 by feeding the work W in the XY axis directions, and the work W is punched and other processing is performed by lowering the ram 5. The feed mechanism of the work W in the X and Y two-axis directions will be described in detail.
And the feed screw 13 so as to be movable in the Y direction. In addition, the carriage 1 is attached to the carriage base 9.
5 is provided so as to be movable in the X-axis direction by the motor 17 and the feed screw 19.

The carriage 15 is provided with a work clamp device 21 according to the embodiment of the present invention for gripping the work W.

Further, side tables 23 are provided on both sides of the bed 7 to horizontally support the work W. The side tables 23 are connected to the carriage base 9 and move in the Y-axis direction together with the carriage base 9. To do. A caterpillar table 25 is provided between the left and right side tables 23, and a sprocket 27 is provided.
It is hung around and is designed to move forward and backward. Then, the caterpillar table 25 also moves in the Y-axis direction together with the carriage base 9 like the both side tables.

The side table 23 and the caterpillar table 25 are provided with rollers 29 so that the work W can be smoothly moved when moving in the left-right X-axis direction.

A transport caterpillar table 31 is provided at a rear portion of the punch press with the punch 1 and the die 3 interposed therebetween.
The caterpillar table 31 supports the vicinity of an end portion of the work W which is not gripped by the clamp device 21, and carries out the product processed and discharged from the work W.

The detailed structure of the work clamp device 21 used in such a punch press is shown in FIGS. 1 to 3. In the clamp body 33 fixed to the carriage 15 moving in the X-axis direction, the ball bearing 35
A cylinder body 37 is provided via the. A lower jaw 39 is integrally formed on the lower portion of the cylinder body 37. An upper jaw 45 is pivotally supported near the lower end of a piston rod 41 driven by the cylinder body 37 via a pin 43. This upper jaw 45
Can rotate about the fulcrum pin 47 with respect to the lower jaw 39, and the operation of the cylinder body 37 causes the lower jaw 3 to move.
9, and the work W is clamped between the upper and lower jaws 39 and 45.

In order to prevent the vertical movement of the upper and lower jaws 39, 45 with respect to the clamp body 33 due to the action of the force in the rotational direction, the vertical movement of the lower jaw 39 with respect to the clamp body 33 is guided and the lower jaw 39 with respect to the clamp body 33 is guided.
A regulation guide device for regulating the horizontal rotation of the above is provided. That is, in the present embodiment, the eccentric cam portion 4 is provided on the clamp body 33 as a part of the regulation guide device.
An adjusting knob 51 forming 9 is attached. An inner race 53 is fitted to the eccentric cam portion 49 of the adjusting knob 51, and a roller 57 is rotatably provided outside the inner race 53 via a bearing 55. This roller 57
Is a guide member that presses the left and right side surfaces of the lower jaw 39 integrally provided on the cylinder body 37 and guides them vertically. A bushing presser 61 is provided between the flange portion 59 of the adjusting knob 51 and the inner race 53. By screwing the fixing bolt 63 into the clamp body 33, the adjusting knob 51 can be rotated at a desired rotational position. It will be fixed.

The operation of the work clamp device 21 having the above configuration will be described below. As shown by the solid line in FIG. 3, when the piston rod 41 projects downward, the upper jaw 45 rotates about the fulcrum pin 47 and the mouth is open with the lower jaw 39. In this state, the edge of the work W is inserted between the upper and lower jaws 39 and 45. Subsequently, the cylinder body 37 is driven and the piston rod 41 is operated upward to rotate the upper jaw 45, and the work W is clamped and fixed between the upper jaw 45 and the lower jaw 39. Thus
The work W is clamped between the upper and lower jaws 39 and 45.

In order to prevent the upper and lower jaws 39, 45 from rotating left and right,
Loosen the fixing bolts 63 on both sides, rotate the adjustment knob 51, and rotate the eccentric cam portion 49. This eccentric cam part 49
By the rotation, the roller 57 provided outside the eccentric cam portion 49 presses the upper and lower jaws 39 and 45 from both sides.
In this state, by tightening the fixing bolt 63, the adjusting knob 51 is fixed at a predetermined rotation position.

By this operation, the cylinder body 37 is prevented from rotating around the ball bearing 35 with respect to the clamp body 33, and the left and right swings are eliminated.

However, since the roller 57 can freely rotate even in the state where the left and right runouts are prevented as described above, when the cylinder body 37 and the upper and lower jaws 39 and 45 need to be moved up and down, they remain in the pinched state. The vertical movement is possible.

[Effects of the Invention] As will be understood from the above description of the embodiments, in short, the present invention provides the clamp main body 33 mounted on the carriage 15 movable in the X-axis direction, with the cylinder main body 37 vertically movable, A work clamp device in which an upper jaw 45 that cooperates with a lower jaw 39 fixed to the cylinder body 37 to clamp a work W from the up and down direction is connected to a piston rod 41 that is vertically movable in the cylinder body 37. In addition, regulating guide devices for guiding the vertical movement of the lower jaw 39 with respect to the clamp body 33 and regulating the horizontal rotation of the lower jaw 39 with respect to the clamp body 33 are provided at a plurality of positions of the clamp body 33. The guide members 57 in each regulation guide device are in contact with both side surfaces of the lower jaw 39.

As is apparent from the above configuration, in the present invention, the upper and lower jaws 45, 39 of the work clamp device are provided so as to be vertically movable with respect to the clamp body 33 as in the general work clamp device. 45, 39
The horizontal rotation of the guide member 57 is prevented by the guide members 57 of the restriction guide device contacting both side surfaces of the lower jaw 39.

Therefore, when the workpiece W is clamped by the workpiece clamp device and the carriage 15 equipped with the workpiece clamp device moves in the X-axis direction or stops, the upper and lower jaws 45,
39 tends to be rotated horizontally, but in the present invention, the horizontal rotation is prevented by the action of the regulation guide device, so that the positional relationship between the upper and lower jaws 45 and 39 with respect to the clamp body (33). The workpiece W is always held accurately and the workpiece W can be positioned accurately.

[Brief description of drawings]

1 is a partially cutaway plan view of an embodiment of the present invention, FIG. 2 is a front sectional view of the above embodiment, FIG. 3 is a side sectional view of the above embodiment, and FIG. 4 is for the above embodiment. FIG. 5 is a side view of the punch press, and FIG. 5 is a plan view of the punch press. 21 ... Work clamp device 33 ... Clamp body, 35 ... Bearing 37 ... Cylinder body, 39 ... Lower jaw 41 ... Piston rod, 45 ... Upper jaw 49 ... Eccentric cam part, 51 ... Adjusting knob 57 ... Roller, 63 ... Fixing bolt W ... Work

Claims (2)

[Scope of utility model registration request] 1. A carriage (15) movable in the X-axis direction.
Clamp body (33) attached to the cylinder body (3
7) is provided so as to be movable up and down, and an upper jaw (45) that clamps the work (W) from the vertical direction in cooperation with a lower jaw (39) fixed to the cylinder body (37) is provided in the cylinder body (37). ) Is connected to a piston rod (41) movably up and down, and the lower jaw (3) with respect to the clamp body (33) is provided.
9) regulating guide devices for guiding the vertical movement of the clamp body (33) and regulating the horizontal rotation of the lower jaw (39) with respect to the clamp body (33) are provided at a plurality of positions of the clamp body (33). A work clamp device in which each guide member (57) of the guide device is in contact with both side surfaces of the lower jaw (39). 2. The eccentric cam portion (4)
9) The adjustment knob (51) provided with the clamp body (3)
3) The eccentric cam portion (49) is rotatably fixed and a roller (57) as a guide member is rotatably provided on the eccentric cam portion (49). Work clamp device.