JPS608901Y2 - Workpiece clamping device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a workpiece clamping device for clamping a workpiece on a bed, and more specifically, a clamp lever for clamping the workpiece moves back and forth and swings. The present invention relates to a workpiece clamping device of a type that clamps or releases a workpiece by clamping or releasing the workpiece.

This type of clamp device consists of an arm that is swingably attached to a base and a clamp lever whose middle part is pivotally supported at the tip of the arm.By swinging the arm forward, the clamp lever is - is moved to a clampable position and the rear end of the clamp lever is pushed up in the clampable position, thereby clamping the workpiece at the tip of the clamp lever.

After finishing the machining work, release the push-up force on the rear end of the clamp lever to separate the tip of the clamp lever from the workpiece, and swing the arm backward to move the clamp lever away from above the workpiece. so that the workpiece can be removed.

In this way, the clamp device has two parts: one for swinging the arm and one for moving the clamp lever.
This method has the disadvantage that a separate fluid cylinder device is required and a large space is required for its arrangement.

Therefore, the present invention has a simple and compact structure,
It is an object of the present invention to provide a workpiece clamping device that can reliably and easily clamp a workpiece.

The workpiece clamping device according to the present invention includes a clamp base fixed to a bed on which a workpiece is placed, an arm whose base end is supported by a pivot shaft on the clamp base, and a tip of the arm. A clamp lever whose intermediate portion is pivoted and which clamps the workpiece; a first cylinder device provided on the base to swing the arm; and a first cylinder device provided on the base to swing the clamp lever. In the two-cylinder device, the pivot shaft is a piston in the first cylinder device that is fitted in the base so as to be slidable in the axial direction, and the pivot shaft is axially slidable with respect to the arm. The arm is movable relative to the base in the axial direction of the pivot shaft, and the arm is movable relative to the base in the axial direction of the pivot shaft.
Fluid pressure introduced into the cylinder causes relative movement of the pivot shaft in the axial direction between the pivot shaft and the arm, and the relative movement between the pivot shaft and the arm. The present invention is characterized in that a motion converting means is provided for converting the motion into the swinging motion of the arm.

As the motion converting means, for example, a combination of a lead groove and an engaging pin that fits into the lead groove may be used.

According to the above structure of the present invention, the pivot shaft that supports the arm also serves as a piston in the fluid cylinder device that swings the arm, so the space for arranging the fluid cylinder device is small, and the structure as a whole is improved. Becomes compact.

Hereinafter, a workpiece clamping device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of the workpiece clamping device of the present invention.

In FIG. 1, reference numeral 1 indicates a workpiece clamping device, and this clamping device 1 is fixed on a bed B and clamps a workpiece W on the bed B. As shown in FIG.

The clamp device 1 has a base 2 fixed on a bed B.

The base 2 includes a base 3 and a fork 4 extending forward from the base 3.

As shown in FIG. 2, between the forks 4, an arm 5 is pivotally supported at its base end by a pivot shaft 6.

At the tip of the arm 5, a clamp lever 7 is pivotally mounted at its intermediate portion by a pivot shaft 8.

In order to swing the arm 5, a first cylinder 9 (see FIG. 2) is provided across the fork 4, and on the other hand, a second cylinder 10 is provided to swing the clamp lever 7. (Figure 3).

Next, the structure of the first cylinder 9 and its vicinity will be explained with reference to FIG.

A pivot shaft 6 is fitted in the forked portion 4 of the base 2 as a piston of a first cylinder 9 that is slidable in the axial direction. The shaft 6 forms a first pressure chamber 9a and a second pressure chamber 9b.

Hydraulic passages 11a and llb are connected to the first and second pressure chambers 9a and 9b, respectively.

A long groove 12 extending in the axial direction is formed in a part of the circumferential surface of the pivot shaft 6, and the tip of a bolt 13 attached to the arm 5 is fitted into the long groove 12.

The width of this long groove 12 is made approximately equal to the diameter of the tip of the bolt 13.

Due to the action of the long groove 12 and the bolt 13, the pivot shaft 6 is
Although it is slidable in the axial direction of the arm 5, rotation around the axis is restricted.

Further, a spiral groove, that is, a lead groove 14 is formed in a part of the sliding surface of the pivot shaft 6 with the peripheral wall of the first cylinder 9, and on the other hand, this lead groove is formed in the peripheral wall of the first cylinder 9. 14
An engaging pin 15 that fits into is fixed.

Due to the action of the lead groove 14 and the engagement pin 15, the pivot shaft 6 rotates about this shaft when sliding in its axial direction.

Note that the reference numeral 16 in FIG. 2 indicates an O-ring.

The positions of the arm 5 and the clamp lever 7 will be explained with reference to FIG. 3 when the pivot shaft 6 acting as a piston of the first cylinder 9 is in the position shown in FIG. The clamp lever 7, which is pivoted to the tip of the arm 5, is in a backward position, and the apparatus as a whole is in an unclamped state.

For the purpose of explanation later, the clamp lever 7 is attached to the arm 5 as shown in FIG.
Preferably, the recess 17 is larger than the tip of the arm 5 and a leaf spring 18 is provided on the front wall of the arm 5.

Next, the structure of the second cylinder 10 and its vicinity will be explained with reference to FIG.

As can be seen from FIG. 3, the second cylinder 10 extends vertically, has a piston 19 disposed therein, and has first pressure chambers 10a and 10b formed above and below the piston 19.

The first and second pressure chambers 10a and 10b include
Hydraulic passages 20 and 21 are connected, respectively.

One end is fixed to the upper surface of the piston 19,
A piston rod 22 is provided which extends from there out of the cylinder 10 through the second pressure chamber 10b.

In addition, in FIG. 3, the piston rod 22 is shown in a retracted state.

Next, the operation of the workpiece clamping device having the above structure will be explained with reference to FIGS. 2 and subsequent figures.

First, in the inactive state of the device as shown in FIGS. 2 and 3, the hydraulic passage 1 is connected to the first pressure chamber 9a of the first cylinder 9.
0, while oil is supplied from the second pressure chamber 9b to the hydraulic passage 1.
Drain oil through 1.

As a result, the pivot shaft 6, which is a piston, moves toward the second pressure chamber 9b as shown in FIG. As a result of this action, it is rotated in the direction indicated by arrow A in FIG.

This rotational force of the pivot shaft 6 is transmitted to the arm 7 by the action of the long groove 12 and the bolt 13, and the arm 1 is rotated about the pivot shaft 6 in the direction of arrow B.

Along with this, the clamp lever 7 pivotally attached to the tip of the arm 5 is also moved forward, but at this time, the clamp lever 7 is pushed counterclockwise in FIG. 5 by the leaf spring 18 and moved forward. , its right or rear end is pressed onto the tip of the piston rod 22.

After this, when oil is supplied to the first pressure chamber 10a of the second cylinder 10 via the hydraulic passage 20, and oil is drained from the second pressure chamber 10b via the hydraulic passage 21, as shown in FIG.
The piston rod 22 rises together with the piston 19, and as a result, the rear end of the clamp lever 7 is pushed upward.
The clamp lever 7 is rotated in the direction of arrow C and clamps the workpiece W on the bed B with its tip.

To release this clamp, perform the opposite operation as described above, that is, supply oil to the second pressure chamber 10b of the second cylinder 10, rotate the clamp lever 7 clockwise by the action of the leaf spring 18, and then The second pressure chamber 9b of 9 may be supplied with oil and the arm 5 may be rotated counterclockwise.

In addition, in the above-described embodiment, the pivot shaft 6 rotates,
An example of transmitting this rotation to the arm 6 has been explained, but
This pivot shaft 6 can only slide relative to the base 2, and by providing the above-mentioned lead groove 14 and engagement pin 15 on the sliding surfaces of the arm 5 and the pivot shaft 6, only the arm 5 can slide. It may also be of the type that rotates.

According to the workpiece clamping device of the present invention described above,
In particular, the arm is rotated by using the pivot shaft at the base end of the arm as the piston of the first cylinder and by providing a means for converting the linear motion of the above structure into rotational motion and transmitting it. Since the device is compact and the clamp lever moves back and forth and rotates to clamp the workpiece, the workpiece can be clamped conveniently and reliably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a workpiece clamping device according to an embodiment of the present invention, and FIG. 2 is a horizontal cross-section showing the configuration of the first cylinder portion when the clamping device of FIG. 1 is in an inactive state. 3 is a longitudinal sectional view showing the arrangement of each member when the clamping device shown in FIG. 1 is inactive, and FIG. 4 is a longitudinal sectional view showing the arrangement of each member when the clamping device shown in FIG. FIG. 5 is a view similar to FIG. 2 when the first cylinder is in the position shown in FIG. 4, and FIG. 6 is a view similar to FIG. The figure is a view similar to FIGS. 3 and 4 showing the arrangement of each member when the clamping device is in the operating position. B... Bed, W... Work (workpiece), 1... Workpiece clamping device, 2...
...Base, 5...Arm, 6...Pivot shaft, 7...Clamp lever-19...
First cylinder, 10...Second cylinder, 14...
...Lead groove, 15...Engagement pin.

Claims (1)

[Scope of utility model registration request] A clamp base fixed to the bed on which the workpiece is placed; an arm whose base end is supported by a pivot shaft on the clamp base; Clamp lever 1 for clamping objects onto the bed
It consists of a first cylinder device that is provided on the base and swings the arm, and a second cylinder device that is provided on the base and swings the clamp lever. , wherein the pivot shaft is a piston in the first cylinder device that is fitted in the base so as to be slidable in the axial direction, and the pivot shaft is a piston that is axially relative to the arm. The arm is movable in the axial direction of the pivot shaft with respect to the base, and the arm is moved between the pivot shaft and the pivot shaft by fluid pressure introduced into the first cylinder. relative movement in the axial direction of the pivot shaft occurs, and motion converting means for converting the relative movement between the pivot shaft and the arm into rocking motion of the arm. A workpiece clamping device characterized by being provided.