JPH018255Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a workpiece clamping device, and more specifically, the workpiece clamping device used in punch presses, shearing machines, bending machines, etc. changes the clamping position according to the size of the workpiece. The present invention relates to a clamping device capable of

Conventionally, when clamping a workpiece in a turret punch press or the like that has multiple workpiece clamping devices, the entire clamping device must be moved in order to release unnecessary workpiece clamping devices from the workpiece depending on the size of the workpiece. There were problems such as the operation was troublesome and the clamping device was prone to failure.

This invention was devised in view of the above-mentioned problems, and provides a workpiece clamping device that simplifies the work of changing the clamping position depending on the size of the workpiece.

In order to achieve this object, this invention provides an abutment reference member in the work clamp portion of the work clamp device so as to be movable forward and backward via a swinging member.

An embodiment of this invention will be described below based on the accompanying drawings.

FIG. 1 shows a turret punch press 1 that performs punching on a plate-shaped workpiece W while all controls are performed by a numerical control device (not shown). The turret device 3 is equipped with various types of punches and dies (not shown).

On the upper surface of the support table 5 that supports the workpiece W, a large number of balls (not shown) are arranged to support the workpiece W smoothly.

Two guide rails 7 extending parallel to the left-right direction with respect to the frame of the turret punch press 1 are attached to the front and rear side walls of the support table 5.
Both ends of a carry guide 9 extending in a direction perpendicular to the longitudinal direction of the support table 5 are movably supported on the guide rail 7 .

The carry guide 9 is provided with a horizontally slidable carriage 11 along the longitudinal direction of the carry guide 9.
1 is equipped with a plurality of work clamp devices 13 for clamping the work W.

Therefore, after the work W is clamped by the work clamp device 13, the carry guide 9 is moved in the left-right direction along the guide rail 7, and the carriage 11 is moved back and forth orthogonally to the moving direction of the carry guide 9. By moving the workpiece W horizontally in the horizontal direction, the workpiece W is positioned on the horizontal upper surface of the support table 5 in the front-rear, left-right directions, and punching is performed using the punch and die mounted on the turret device 3. It is what it is.

Note that the balls mounted on the upper surface of the support table 5 are placed on the support table 5 so as not to interfere with the carry guide 9 moving along the guide rail 7.
It is attached so that it can freely appear and retract from the top surface.

FIG. 1 shows a general turret punch press as an example of a plate processing device equipped with a workpiece clamping device. However, this invention is not limited to turret punch presses, but can also be implemented in shearing machines, automatic folding machines, and the like.

As shown in FIG. 2 and below, the work clamping device 13 includes a work clamping section 15, a drive section 17 (fluid cylinder main body 17) attached to the upper surface of the proximal end of the work clamping section 15, and actuating the clamping device 13. ), an abutment drive section 21, etc., which moves the abutment reference member 19 of the work W in the work clamp section 15 forward and backward in the abutment direction of the work W (horizontal direction in FIG. 2).

The work clamping part 15 of the work clamping device 13 has a lower jaw 27 formed in a fork shape and having a clamp jaw 23 fixed at the tip with a set screw 25, and a pin 29 between the lower jaw 27 in the vertical direction. The upper jaw 31 is rotatably mounted, and the clamp jaws 2 are placed on both sides of the upper jaw 31, sandwiching the upper jaw 31.
An abutment reference member 1 is provided on the abutment reference member 1 so as to be movable forward and backward in the abutment direction of the workpiece W via a swinging member 33.
It consists of 9.

The lower jaw 27 is connected to the clamp body 35 of the drive section 17 at the lower base end of the lower jaw 27.
A tie rod 37 is installed so as to be attached and adjusted to the clamp body 35, and this tie rod 37 is fixed to the bottom wall of the clamp body 35 by a tie bolt 39. At the center of this tie rod 37 is an adjustment screw 4.
1 is screwed in, and this adjustment screw 41 abuts against a stopper 43 embedded in the lower jaw 27. Therefore, the lower jaw 27 is adjusted by the adjusting screw 41.
The vertical position of the tip can be finely adjusted.

The abutment drive unit 21 that moves the abutment reference member 19 forward and backward has a pin 44 attached to the upper part of a column 45 that is attached to the workpiece clamp part 15 side of the clamp body 35 and upwardly attached to the upper surface of the lower jaw 27. It is rotatably supported via. The abutment drive section 21 has a cylinder and a piston housed in the cylinder, and a piston rod 47 is attached to the piston so as to be movable in the direction in which the abutment drive section 21 extends. piston rod 47
At the tip of the piston rod 47, a third piston rod is inserted.
A connecting pin 49 extends in the vertical direction in the figure,
The triangular swinging member 33 is provided at both ends of the connecting pin 49 so as to be swingable by the reciprocating movement of the piston and the piston rod 47 about a fixed shaft 51 installed on the lower jaw 27 as a supporting shaft. Further, one end of a connecting member 55 is supported by a support pin 53 at one end of the swinging member 33, and one end of a connecting member 55 is supported by a supporting pin 57 at the other end of the connecting member 55.
A moving member 59 is provided, which has the abutting reference member 19 fixed to its tip, which can move forward and backward. This moving member 59 is guided through a through hole 60 provided in the lower jaw 27. Furthermore, lower part Jyo 27
An adjustment screw 62 for adjusting the reference surface of the abutting reference member 19 is attached to the upper surface and near the mounting position of the piston rod 47 of the swinging member 33.

Next, as shown in FIG. 5, the driving section 17 includes a clamp body 35 in which a descending return spring 63 and a descending return rod 65 that press the base end of the lower jaw 27 are embedded so as to be movable up and down. The clamp body 35 is comprised of a cylindrical member 69 and a fluid cylinder 73 (in this embodiment, an air cylinder) installed vertically movably via a ball bush 71.

The fluid cylinder 73 is composed of a bottomed cylindrical cylinder 75 and a piston rod 77 slidably fitted inside the cylinder 75. The bottom wall 79 of the cylinder 75 is connected to the lower jaw 27 by a fixing bolt 81.
are connected via. The lower end of the piston rod 77, which passes through a through hole 83 formed in the center of the bottom wall 79 of the cylinder 75 and projects from the through hole 83, is formed at the base end 85 of the upper jaw 31. The piston rod 77 is engaged with the U-shaped long groove 87, and the lower end of the piston rod 77 within the long groove 87 is connected via a connecting pin 91 inserted into a long hole 89 formed in the side wall of the long groove 87.

A piston 95, which is installed internally to divide the cylinder chamber 93 of the cylinder 75 into an expansion cylinder chamber 93a and a contraction cylinder chamber 93b, is fixedly mounted on the upper part of the piston rod 77. The upper end opening 97 of this cylinder chamber 93 is closed by an upper lid body 99. A spring seat 101 and a piston 9 are installed in the upper part of the cylinder chamber 93.
A spring 103 is mounted between the piston rod 77 and the piston rod 77 to constantly bias the piston rod 77 in the direction of extension (downward in FIG. 6).

A supply passage 105 is formed in the center of the piston rod 77 for supplying working fluid (high pressure air in this embodiment) to the contraction side cylinder chamber 93b in the cylinder chamber 93, and also to the expansion side cylinder chamber 93a.
A discharge passage (not shown) for this working fluid is formed in the. A supply pipe 109 connected to a supply source of working fluid (not shown) is connected to the supply port 107 of the supply passage 105, as shown in FIGS. 5 and 6.

A spring 113 is elastically mounted between a ring-shaped spring seat 111 fixed inside the lower end of the cylindrical member 69 and the lower surface of the ball bush 71. A ring-shaped stopper 115 is fixed thereto to prevent it from coming off.

Further, L-shaped members 117 are fixedly installed on both left and right sides (in FIG. 5) of the upper part of the clamp body 35, and a connecting pin 119 is installed above the two L-shaped members 117. Furthermore, as shown in FIG.
A support member 123 that is pivotally supported by the support member 19 is disposed, and this support member 123 is
It is fixed to the carriage 11 by mounting screws 125 provided at the corners.

The protrusion 12 at the lower end of the support member 123
A protrusion 127 extends on the opposite surface from 1, and an adjustment member 129 is attached to the protrusion 127 so that the support member 123 and the protrusion 127 form a crank shape in FIG.

On the other hand, an auxiliary member 131 is formed integrally with the clamp body 35 on the lower end side wall of the clamp body 35 on the support member 123 side, and an adjustment screw 133 that slidably passes through the adjustment member 129 is screwed into this auxiliary member 131. has been done. The adjusting screw 133 is located between the auxiliary member 131 and the adjusting member 129, and the lower part of the clamping device 13 is connected to the workpiece W.
A spring 135 is loaded to bias the spring 135 in the direction, and a spring seat 137 is provided on the adjustment member 129 side in contact with the spring 135 and fitted into the adjustment screw 133.

Next, the operation of this embodiment configured as above will be explained.

Carriage 11 in tallest punch press 1
When punching the workpiece W in a state where a plurality of workpiece clamping devices 13 are attached to the workpiece W, the clamping device 13 becomes unnecessary depending on the size of the workpiece W, and the clamping portion of the unnecessary clamping device 13 is generated. The abutting reference member 19 at 15 may get in the way of the workpiece W. Work clamp device 1, which was no longer needed at this time
By operating the switch 3 (not shown), the piston rod 47 of the abutting drive section 21 moves diagonally upward to the right in FIG. As a result, as shown in FIG. 7, the swinging member 33 pulled by the piston rod 47 rotates clockwise about the fixed shaft 51, and the abutting drive section 21 also rotates counterclockwise about the pin 44. Rotate to. As the swinging member 33 rotates clockwise, the support pin 53 side of the connecting member 55 moves diagonally upward to the right, and the abutment reference member 19 moves together with the moving member 59 to the reference position to avoid contact with the workpiece W. to the reverse position. Therefore, the workpiece W is not brought into contact with the abutment reference member 19 of the workpiece clamping device 13 that is no longer needed, and the workpiece W is moved to another necessary workpiece clamping device 1.
The workpiece W can be clamped by being brought into contact with the abutment reference member 19 of No. 3 and positioned at the reference position of the workpiece clamping device 13.

Next, when clamping the workpiece W, a switching valve (not shown) is switched to release the working fluid in the contraction side cylinder chamber 93b to the atmosphere.
Then, the piston rod 77 and the piston 95 move downward in the extension direction, that is, in FIG. 6, due to the elastic force of the spring 103 contained in the extension cylinder chamber 93a. When the lower end of the piston rod 77 largely protrudes from the lower end of the cylinder 75, the tip of the upper jaw 31, which is connected to the lower end of the piston rod 77 via the connecting pin 91, moves upward (clockwise) using the pin 29 as a fulcrum. Rotate. As a result, both ends of the lower jaw 27 and the upper jaw 31 are opened to receive the workpiece W.

In such a state, the workpiece W is placed between the clamp jaw 23 of the lower jaw 27 and the upper jaw 31.
Insert one side of the workpiece and then start working on the workpiece clamp.

This work clamping operation is performed by introducing high pressure air (working fluid) from a working fluid supply source (not shown) into the contraction side cylinder chamber 93b in the cylinder chamber 93 through the supply passage 105. Piston 95 and piston rod 77
rises against the elastic force of the spring 103,
The air in the expansion side cylinder chamber 93a is discharged.
That is, the piston rod 77 is drawn into the cylinder chamber 93.

When the piston rod 77 is drawn into the cylinder chamber 93, the tip of the upper jaw 31, which is connected via the connecting pin 91, moves downward, that is, counterclockwise, using the pin 29 as a fulcrum, as described above. Rotate and use the clamp jaw 23 at its tip.
This clamps one side of the workpiece W inserted between the two. When the workpiece clamping device clamps the workpiece W, if the thrust load exerted by the workpiece W on the abutment reference member 19 of the workpiece clamp portion 15 exceeds a certain level, the support member will move against the spring 135 at the rear of the clamp body 35. The entire clamping device 13 moves in the opposite direction to the workpiece W using the connecting pin 119 installed on the upper end protrusion 121 of the clamping device 123 as a fulcrum. As a result, an adverse effect on the clamp device 13 can be prevented.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims for utility model registration. The reference member 19 comes into contact with the work W held between the lower jaw 27 and the upper jaw 31 of the work clamp device 13, and positions the work W at a reference position. Therefore, by abutting the work W against the abutment reference member 19, the work W can be accurately positioned with respect to the work clamp device 13.

Furthermore, since the abutting reference member 19 is provided so as to be freely retractable from the reference position to a retreating position where it avoids contact with the workpiece, it is possible to When the workpiece W is clamped by the workpiece clamping device 13, by retracting the abutting reference member 19 in the intermediate workpiece clamping device 13, the workpiece clamping device 1 on both sides
3 can accurately hold the workpiece W. In particular, even if the sides of the workpiece W are not in a straight line but have an arcuate shape such that the central part protrudes, for example, by retracting the abutting reference member 19 of the workpiece clamping device 13 in the intermediate part, the above The work W can be easily clamped by the work clamp devices 13 on both sides without interference between the abutment reference member 19 and the work W. In addition, there is no need to move the entire workpiece clamping device to remove it from the workpiece, which is no longer needed due to the size of the workpiece.
Since it is only necessary to move the abutment reference member in the clamp section, it is possible to easily and reliably determine the clamp position of the workpiece.

It should be noted that this invention is not limited to the above-mentioned embodiments, and can be implemented in modes other than the above-mentioned embodiments.

[Brief explanation of the drawing]

The attached drawings show one embodiment of this invention, and the first
The figure is a schematic front view of the turret punch press with the workpiece clamping device attached, Figure 2 is the front view of the workpiece clamping device, Figure 3 is the same top view, Figure 4 is the same bottom view, and Figure 5 is the same. Partial sectional view of Figure 3;
FIG. 6 is a cross-sectional view taken from FIG. 5, and FIG. 7 is a cross-sectional view taken from FIG. 3. Explanation of symbols representing main parts of the drawings, 13...
...Work clamp device, 17... Drive unit, 19...
...Abutment reference member, 21...Abutment drive section, 27
...Lower Jiyo, 31...Upper Jiyo, 33...
Swinging member.

Claims (1)

[Scope of utility model registration request] The workpiece clamping device 13 is mounted on a carriage 11 that is provided in a plate processing device so as to be movable in the front, back, right and left directions, and is held between a lower jaw 27 and an upper jaw 31 provided on the work clamp device 13. The abutment reference member 19 that abuts the workpiece W and positions the workpiece W at the reference position of the workpiece clamping device 13 is attached to the lower jaw 2.
7, and the abutting reference member 19 is provided so as to be freely retractable from the reference position to a retracted position where it avoids contact with the work.