JP2000051977A - Work clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve punching accuracy and safety as well as to enable the working of a small size product. SOLUTION: This work clamp device 39 is constituted of a fixed lower clamp jaw 77 to hold a work W and an upper clamp jaw 79 pivotedly jointed to this lower clamp jaw 77 and being freely swingable by a hydraulic cylinder 51. A clamp plate 81 is moved through a driving motor 73, a pinion gear 75 and rack teeth 85 and the upper and lower clamp jaws 77, 79 are supported by the clamp plate 81 and advanced back and forth. A T-shaped part 103T of a shaft 103 provided to the upper clamp jaw 79 is made freely jointed to or detached from a T-shaped member 59 provided to a piston rod equipped to the hydraulic cylinder 51. Thereby, working of a small size product can be performed, the drawing accuracy is improved and the safety is improved as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work clamping device for gripping one end of a work and transporting the work.

[0002]

2. Description of the Related Art Conventionally, for example, a turret punch press as a plate processing machine is used to position a clamp on a die during positioning of a workpiece, and if the punch is moved up and down as it is, the clamp is punched by the punch. In this case, the clamp generally releases the work and retreats to the side because the clamp is damaged.

More specifically, referring to FIGS. 6 and 7, a turret punch press 201 has a plurality of punches P.
Upper turret 203 equipped with
Lower turret 2 equipped with a plurality of dies D facing 03
05 is provided rotatably in synchronization. A ram 209 operated by the fluid cylinder 207 is provided right above the punch P. By hitting the punch P,
The work W is punched in cooperation with the die D.

A work table 2 for supporting the work W
A carriage base 213 that is movable in the Y-axis direction (the left-right direction in FIG. 6) is provided on the carriage 11, and the carriage base 213 is movable via a ball screw 215 by a drive motor (not shown). .

The carriage base 213 is provided with a carriage 219 which is screwed to a ball screw 217 extending in the X-axis direction (a direction perpendicular to the drawing in FIG. 6) from a driving motor (not shown). Carriage 2
19 is provided with a plurality of work clamp devices 221. In this work clamp device 221, a clamp member 225 constituted by upper and lower clamp jaws on a clamp body 223 is capable of retracting as shown by a solid line and a two-dot chain line in FIG. 7.

With the above configuration, even when the clamp member 225 is positioned on the die D, the work W is released and avoided, so that the clamp member 225 is not punched by the punch P.

[0007]

By the way, in the work clamp device 221 in the conventional turret punch press 201 described above, a plurality of work clamp devices 22 are provided.
As shown in FIG. 7, in order to retreat the clamp member 225, it is necessary to increase the distance L between the clamp bodies 223.

Therefore, there is a problem that the small workpiece W cannot be clamped and cannot be machined.

SUMMARY OF THE INVENTION An object of the present invention is to provide a work clamp device which enables processing of a small product, improves punching accuracy and improves safety.

[0010]

In order to achieve the above object, a work clamping apparatus according to the present invention according to the first aspect of the present invention comprises a fixed lower clamp jaw and a driving device for vertically moving an upper clamp jaw with respect to the lower clamp jaw. In the work clamping device for moving the upper and lower clamp jaws in the front-rear direction by moving the upper and lower clamp jaws in the front-rear direction, a front-rear drive device is provided to the vertical drive device via a coupling device. Things.

Therefore, the upper and lower clamp jaws can be moved back and forth by the front / rear drive device, and the work can be gripped or retracted. Therefore, the interval between a plurality of provided work clamp devices can be reduced and small products can be processed. In addition, since the upper and lower clamp jaws do not enter the turret, for example, breakage is prevented.

According to a second aspect of the present invention, there is provided the work clamping apparatus according to the first aspect, wherein the connecting device includes a T-shaped groove provided in a vertically moving drive device, and the T-shaped groove provided in the T-shaped groove. And a T-shaped part which is integrated with the clamp jaw and is freely engageable.

[0013] Therefore, T
Since the T-shaped portion provided with the upper clamp jaw in the U-shaped groove engages with the coupling device, the engagement is reliably performed.

According to a third aspect of the present invention, there is provided a work clamp apparatus according to the first aspect, wherein the front / rear drive unit is provided with a drive motor on a bracket attached to the vertical movement drive unit. A guide member having rack teeth to which the mounted pinion gears are screwed is provided on a clamp plate which can move forward and backward, supporting the upper and lower clamp jaws, and the guide member is engaged with a support member provided on the bracket. It is characterized by the following.

Therefore, a guide member provided with rack teeth is provided on a clamp plate supporting the upper and lower clamp jaws, and this guide member is engaged with a support member provided on a bracket, and a pinion gear mounted on a drive motor is connected to the rack. Meshed with the teeth and driven by the drive motor,
The lower clamp jaw is movable back and forth. Therefore,
The upper and lower clamp jaws have no blur in the front and rear and left and right directions, and the punching accuracy is improved.

According to a fourth aspect of the present invention, there is provided the work clamp device according to the first aspect, wherein the vertical movement driving device is a hydraulic cylinder equipped with a piston rod provided with the T-shaped groove at a lower portion. It is characterized by becoming.

Therefore, since the upper clamp jaw is operated by the piston rod provided on the fluid pressure cylinder, reliable operation can be obtained with a simple structure at low cost.

According to a fifth aspect of the present invention, in the work clamp apparatus of the second and fourth aspects, the T-shaped portion engages with the T-shaped groove when the upper clamp jaw advances. The upper clamp jaw is separated from the T-shaped groove when the upper clamp jaw is retracted.

Therefore, when the upper clamp jaw is connected to the T-shaped groove when the upper clamp jaw is advanced, the upper clamp jaw can perform a clamping operation, and when the upper clamp jaw is retracted, the T-shaped portion is separated from the T-shaped groove. Does not transmit the pressing force. Therefore, when the upper clamp jaw is retracted, the clamp operation is never performed, so that safety is improved.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIGS. 4 and 5, the overall arrangement of the work clamping device provided in the punching press will be briefly described for easy understanding. In addition, although the punching press is targeted, the present invention is not limited to this model, but is directed to all work clamping devices for loading and unloading a workpiece to and from a machine tool.

The turret punch press 1 has column frames 5, 7 erected on both sides of a base 3, and further includes an upper frame 9 above these column frames 5, 7.

An upper turret 11 on which a plurality of punches P are mounted is provided on the lower surface of the upper frame 9 with an upper rotating shaft 13.
It is rotatably supported by. A lower turret 15 on which a plurality of dies D forming a pair with the punch P is mounted is rotatably supported by a lower rotating shaft 17 on the upper surface of the base 3 so as to face the upper turret 11.

On the lower side of the upper frame 9, a punch P
Is provided with a ram 21 which is moved up and down by a hydraulically operated cylinder 19 in order to strike. Therefore, the upper turret 11 and the lower turret 15 are rotated synchronously, and a desired punch P and a die D are paired and selectively positioned at a processing position immediately below the ram 21. The workpiece W is punched, and the workpiece W is punched in cooperation with the die D.

A lower turret 15 is provided on the upper surface of the base 3.
, A movable table 25 is provided in the X-axis direction on both sides of the fixed table 23 (a direction perpendicular to the drawing in FIG. 4 and a vertical direction in FIG. 5). A carriage base 27 is integrally provided on the movable table 25, and the carriage base 27 is movable in the Y-axis direction (left and right directions in FIGS. 4 and 5) by a Y-axis drive motor 29 via a ball screw 31. It has become.

Further, the carriage base 27 is provided with a carriage 37 screwed to a ball screw 35 extending in the X-axis direction from an X-axis drive motor 33. The carriage 37 has a plurality of work clamping devices 39. It is provided movably in the X-axis direction.

Therefore, in order to position the work W between the upper turret 11 and the lower turret 15, the carriage 37 equipped with the work clamp device 39 holding the work W is moved in the X-axis direction on the carriage base 27. By controlling the movement and controlling the movement of the carriage base 27 in the Y-axis direction, it is possible to position a desired processing portion of the work W at a processing position of the upper and lower turrets 11 and 15.

Next, the work clamp device 39 which is a main part of the present invention will be described in more detail.

Referring to FIGS. 1, 2 and 3, the work clamp device 39 is provided with a dovetail groove 41 on the carriage 37.
Through the X-axis direction (the horizontal direction in FIGS. 1 and 2;
In the direction perpendicular to the drawing). More specifically, as shown in FIG. 3, the clamp housing 45 is moved in the X-axis direction through the dovetail groove 41 on the clamp mounting plate 43 provided on the carriage 37 so as to extend in the X-axis direction. It is freely attached. One side of the dovetail groove 41 becomes a pressing piece 47, and the pressing piece 41 is positioned by a pressing bolt 49.

The clamp housing 45 is provided with a hydraulic cylinder 51 as a drive for vertical movement, which is suspended from the cylinder body 53 as shown in detail in FIG. A piston 55 is provided movably up and down, and a piston rod 57 extending vertically is integrally provided with the piston 55. A T-shaped member 59 is integrally provided at the lower end of the piston rod 57. Further, a rod 61 is provided on the upper surface of the piston 55, and the rod 61 is attached to the upper cover 5 constituting the cylinder body 53.
It is provided through 3F.

A fluid pressure supply port 6 is provided at the axis of the rod 61.
And a fluid pressure chamber 67 formed below the piston 55 through the flow path 65 from the fluid pressure supply port 63.
Is in communication with A spring 69 is mounted on the upper surface of the piston 55, and the piston 55 is constantly urged downward by the volatility of the spring 69.

With the above structure, when the fluid pressure cylinder 63 is supplied with the pressure fluid through the fluid pressure supply port 63, the pressure fluid flows through the flow passage 65 into the fluid pressure chamber 67, and the piston 55 evaporates the spring 69. By moving upward against the force, the piston rod 57 rises.

When the supply of the pressure fluid is stopped and the air is communicated with the atmosphere, the piston 55 is pushed downward by the volatility of the spring 69, and the piston rod 57 is lowered.

As shown in FIGS. 1 and 2, L-shaped brackets 7 are provided on both side surfaces of the cylinder body 53.
1A and 71B are integrally provided, and the bracket 71A is provided with, for example, an AC servomotor as a drive motor 73 as a front and rear drive device. A pinion gear 75 is mounted on the output shaft of the drive motor 73. The pinion gear 75 is fixed to a fixed lower clamp jaw 77.
Guide members 83A, 8 provided on both sides of a clamp plate 81 for supporting the upper and lower swinging clamp jaws 79.
3B, meshes with rack teeth 85 formed on one guide member 83A. The guide members 83A, 83A,
83B is constituted by a linear guide rail.

Then, the guide members 83A, 83B
Are engaged with linear guides as support members 87A and 87B provided inside the brackets 71A and 71B. Further, as shown in FIG. 2, the brackets 71A, 71B have shot pin cylinders 89A,
89B, and the shot pin cylinder 89 is provided.
Shot pins 91A, 91 which appear and disappear by the operation of A, 89B
B is provided. On the other hand, guide members 83A and 83B
Are provided so as to be positioned at the time of workpiece abutment clamping, and these engagement holes 93A, 93B are provided.
Engage with the shot pins 91A and 91B.

When the drive motor 73 is driven, the pinion gear 15 rotates, and the guide members 83A and 83B move in the Y-axis direction (the direction perpendicular to the drawing in FIG. 1 and the vertical direction in FIG. 2) through the rack teeth 85. 3, the upper and lower clamp jaws 77, 79 move forward or backward.

As shown in FIG. 3, the lower clamp jaw 77 is provided with lower gripping teeth 95 for gripping the work W at its tip, and is provided integrally with the clamp plate 81. An upper clamp jaw 79 is swingably provided on a fulcrum shaft 97 provided at an appropriate position of the lower clamp jaw 77. On the lower surface of the distal end of the upper clamp jaw 79, upper gripping teeth 97 corresponding to the lower gripping teeth 95 are formed.

At the rear end of the upper clamp jaw 79,
A long hole-shaped engagement groove 99 is formed, and this engagement groove 99 is provided on a support shaft 101 provided near the rear side of the upper clamp jaw 79.
The upper clamp jaw 79 is movable with respect to the support shaft 101 in the elongated engagement groove 99 when swinging. A T-shaped shaft 103 is erected on the support shaft 101, and a T-shaped portion 103 T of the T-shaped shaft 103 is integrated with a piston rod 57 provided on the fluid pressure cylinder 51. It is mounted in a T-shaped groove 105 formed in the member 59.

The direction of the T-shaped groove 105 is as follows.
The upper and lower clamp jaws 77, 79 are formed in the same direction as the forward and backward movement of the clamp jaws 77, 79, and the groove length of the T-shaped groove 105 is such that the upper and lower clamp jaws 77, 79 are unclamped as shown by solid lines in FIG. The T-shaped portion 103T provided on the shaft 103 and the T-shaped groove 105 engage with each other when the shaft 103 advances in the Y-axis direction in this state. When the upper and lower clamp jaws 77, 79 are retracted, the T-shaped portion 103T provided on the shaft 103 has a T-shaped groove 10T.
Leave from 5.

Therefore, the upper and lower clamp jaws 7
Since the clamps 7 and 79 do not perform a clamping operation at the time of retreating, they are not clamped even if the hydraulic cylinder 51 is operated by mistake, so that it is safe.

With the above configuration, the upper and lower clamp jaws 77 and 79 are driven by the drive motor 73 and the pinion gear 7.
5, since the rack teeth 85 and the guide members 83A and 83B can be retracted back and forth, there is no blur in the X and Y axis directions, and the punching accuracy can be improved. Also,
Since the upper and lower clamp jaws 77 and 79 can be retracted in the Y-axis direction, that is, back and forth, the distance between the work clamp devices 39 can be reduced, and small workpieces W can be machined. Further, upper and lower clamp jaws 77,
Since the 79 does not enter the upper and lower turrets 11 and 15, the upper and lower clamp jaws 77 and 79 are not damaged and are safe.

The present invention is not limited to the above-described embodiment of the present invention, but can be embodied in other forms by making appropriate changes.

[0043]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, the upper and lower clamp jaws can be moved back and forth by the front and rear driving device, and Can be held or retracted, the spacing between a plurality of provided work clamp devices can be reduced, small products can be processed, and the upper and lower clamp jaws do not enter the turret, for example, to prevent breakage. Can be.

According to the second aspect of the present invention, since the T-shaped portion provided with the upper clamp jaw is engaged with the T-shaped groove provided in the vertical drive device, the connecting device is constituted, so that the connecting device is reliably formed. Engagement can take place.

According to the third aspect of the present invention, the guide plate provided with the rack teeth is provided on the clamp plate for supporting the upper and lower clamp jaws, and the guide member is engaged with the support member provided on the bracket to drive the motor. A pinion gear mounted on the motor was engaged with the rack teeth, and the upper and lower clamp jaws were movable back and forth by driving a drive motor. Therefore, the upper and lower clamp jaws are
There is no blur in the left-right direction, and the punching accuracy can be improved.

According to the fourth aspect of the present invention, since the upper clamp jaw is operated by the piston rod provided on the fluid pressure cylinder, reliable operation can be obtained with a simple configuration at low cost.

According to the fifth aspect of the present invention, the T-shaped portion is connected to the T-shaped groove when the upper clamp jaw is advanced, so that the upper clamp jaw can perform a clamping operation, and when the upper clamp jaw is retracted, the T-shaped portion is T-shaped. Since the portion is separated from the T-shaped groove, the pressing force is not transmitted to the upper clamp jaw. Therefore, when the upper clamp jaw is retracted, the clamp operation is never performed, so that safety can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a work clamping device, showing a main part of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view including a partial cross section in FIG. 1;

FIG. 4 is an explanatory side view of a turret punch press according to an embodiment of the present invention;

FIG. 5 is an explanatory plan view of FIG. 4;

FIG. 6 is a side view of a turret punch press showing a conventional example.

FIG. 7 is an explanatory plan view of a work clamp device, showing a conventional example.

[Explanation of symbols]

 39 Work Clamping Device 51 Fluid Pressure Cylinder (Vertical Device) 57 Piston Rod 59 T-Shaped Member 71A Bracket 73 Drive Motor (Longitudinal Drive) 75 Pinion Gear (Longitudinal Drive) 77 Lower Clamp Jaw 79 Upper Clamp Jaw 81 Clamp Plate 83A Guide member 85 Rack teeth (fore-and-aft drive) 87A Support member 103T T-shaped portion 105 T-shaped groove W Work

Claims (5)

[Claims] 1. A work clamp device for clamping a work by vertically moving a fixed lower clamp jaw and an upper clamp jaw with respect to the lower clamp jaw by a vertical drive device, wherein the upper and lower clamp jaws are moved in the front-rear direction. A work clamp device comprising: a front-rear drive device for moving the drive device to the vertical drive device via a connecting device. 2. The coupling device includes a T-shaped groove provided in a vertically moving drive device, and an engageable T-shaped portion integrated with the upper clamp jaw in the T-shaped groove. The work clamp device according to claim 1, wherein 3. The front-rear drive device includes a drive motor provided on a bracket attached to the vertical drive device, and a guide member having rack teeth meshing with a pinion gear mounted on the drive motor is provided on the upper and lower clamps. Along with the clamp plate that supports the jaw and can move forward and backward,
The work clamp device according to claim 1, wherein the guide member is engaged with a support member provided on the bracket. 4. The work clamp device according to claim 1, wherein the vertical drive device comprises a fluid pressure cylinder having a piston rod provided with the T-shaped groove at a lower portion. 5. The T-shaped portion is configured such that the upper clamp jaw engages with the T-shaped groove when the upper clamp jaw is advanced, and is separated from the T-shaped groove when the upper clamp jaw is retracted. The work clamp device according to claim 2, wherein