JPH11179462A - Method and device for work clamping in plate working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly clamp a work even for the work having a large camber by increasing a clamp margin. SOLUTION: A work clamper 67 presses a work W to a lower clamp jaw 75 fixed to a lower part of a clamp body 73 by an upper clamp jaw 77 and moves up.down attacheably. detachably. Since the upper clamp jaw 77 is connected to the clamp body 73 by a link mechanism 87 to make a clamping margin larger, even the work W having a large camber is smoothly passed between the upper.lower clamp jaws 75, 77. Since a connecting shaft 97 between an upper link 83 and a lower link 85 of the link mechanism 87 is operated by a link drive means 93 and the upper clamp jaw 77 is moved up.down along a guide shaft 79 of the body 73, the work W is surely clamped with the upper.lower clamp jaws 75, 77. Since the work W is pressed to the lower clamp jaw 75 through an energizing means to constantly energize downward a pressing member 99 on a rear face of the upper clamp jaw 77, the stabilized clamp force is provided, even when the plate thickness is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work clamping method and apparatus for a plate material processing machine such as a punch press and a laser processing machine.

[0002]

2. Description of the Related Art Conventionally, for example, a punch press 201 as a plate processing machine has a portal-shaped main body frame 203 which is erected as shown in FIG. 205 is integrated with an upper frame 207 by a side frame (not shown). The lower frame 205, the upper frame 2
In 07, a die block 209 having a plurality of dies D, a punch P mounted thereon, and a punch block 211 are provided so as to be opposed to each other and movable in the Y-axis direction (vertical direction in FIG. 13).

[0003] Nut members 213 and 215 are integrated with the die block 209 and punch block 211, and Y-axis ball screws 217 and 219 extending in the Y-axis direction are screwed to the nut members 213 and 215. Have been. The lower end of the Y-axis ball screws 217 and 219 in FIG. 13 is rotatably supported by bearings 221 and 223, and the upper end of the Y-axis ball screws 217 and 219 in FIG. , 227.

When the Y-axis drive motors 225 and 227 are driven, the Y-axis ball screws 217 and 219 are rotated, so that the die block 209 and the punch block 211 move in the Y-axis direction via nut members 213 and 215. Will be moved to The Y-axis drive motors 225 and 227 are driven in synchronization with each other, and the die block 209 and the punch block 211 are moved in synchronization.

A ram cylinder (not shown) for pressing the punch P via a ram (not shown) is provided above the punch block 211. The ram cylinder is in the U-axis and V-axis directions (X , The same direction as the Y-axis direction), and is positioned above a desired punch P, and the punch P is hit via the ram by the operation of the ram cylinder, whereby the work is performed in cooperation with the punch P and the die D. Punching is performed on W.

As shown in FIG. 13, a first work table 229 extends in the X-axis direction on the work loading side (the right side in FIG. 13) of the punch press 201, and the work unloading side (FIG. 13). A second work table 231 extends in the X-axis direction (on the left side). The first and second work tables 229 and 231 have first and second work tables 229 and 231 for moving and positioning the clamped work W in the X-axis direction. Two work movement positioning devices 233 and 235 are provided.

More specifically, in the first work movement positioning device 233 on the work carry-in side, as shown in FIG. 13, a carriage ball rotated forward and reverse by a carriage drive motor 237 along a first work table 229. The screw 239 is extended in the X-axis direction,
41 is moved in the X-axis direction via a nut member (not shown) screwed into the carriage ball screw 239.

The carriage 241 is provided with two first clamping devices 243 for gripping one side edge of the work W on the first work table 229. Each first clamp device 243 includes an upper clamp jaw and a lower clamp jaw that clamp one side edge of the work W in a work width direction orthogonal to the work conveyance direction.

The clamp mechanism of the upper clamp jaw and the lower clamp jaw is of a direct-acting or lever type, and the opening margin between the upper clamp jaw and the lower clamp jaw is usually one.
It is about 0 mm to 15 mm.

In the second work movement positioning device 235 on the work unloading side, the first work movement positioning device 2 described above is used.
33 and two second clamping devices 245
Is provided.

The work W is carried into the first work table 229 and is gripped by the first clamping device 243 of the first work moving and positioning device 233, moved and positioned by the first work moving and positioning device 233, and the left half of the work W is moved to the left half. Punched.

Thereafter, the work W is moved by the first work movement positioning device 233 so as to reach the second work table 231. This work W is gripped by the second clamp device 245 of the second work movement positioning device 235,
The first clamp device 243 releases the work W, and the first
The work movement positioning device 233 moves backward and moves to the next work W.
Preparations are made.

The remaining right half of the work W is gripped by the second clamping device 245, moved and positioned by the second work moving positioning device 235, and punched.

[0014]

In the conventional work clamping device, the work W is moved from the first clamping device 243 of the first work movement positioning device 233 to the second clamping device 245 of the second work movement positioning device 235.
When the workpiece W is moved to, the work W passes between the upper clamp jaw and the lower clamp jaw of the second clamp device 245.

However, the first work movement positioning device 23
The workpiece W gripped and punched by 3 is warped because, for example, an internal stress is generated around the punched punched hole. In particular, when a product such as a punching metal or stainless steel or the work W is a thin plate, the warp is large. The work W thus warped is applied to the second clamping device 24.
5 When passing between the upper clamp jaw and the lower clamp jaw, the opening between the upper clamp jaw and the lower clamp jaw of the conventional clamping device is usually as small as about 10 mm or 15 mm. There has been a problem that the work W comes into contact with the upper surface of the lower clamp jaw to cause deformation or scratches on the work W, or a work shift occurs, thereby reducing the processing accuracy.

Further, in the case of a direct-acting or lever-type clamping device, the clamping mechanism of the upper clamping jaw and the lower clamping jaw becomes heavy because the clamping device itself becomes large even if the clamping margin is increased, so that it operates at high speed. However, there is a problem that the punch press is not suitable.

Further, in the case of a conventional link-type clamping device such as a toggle mechanism, there is a problem that the clamping force greatly changes due to a change in the thickness of the work.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a large clamp allowance so that even a workpiece having a large warp can be smoothly clamped, and at the same time, a compact and light weight can be achieved. An object of the present invention is to provide a work clamping method and apparatus for a punch press capable of clamping with a stable clamping force against a change in the thickness of a work.

[0019]

According to a first aspect of the present invention, there is provided a method for clamping a workpiece in a punch press, comprising: a lower clamp jaw fixed to a lower portion of a clamp body; In a work clamping method for a punch press provided with a work clamper comprising an upper clamp jaw which moves upward and downward so as to be able to press and separate the lower clamp jaw via a work in opposition, the upper clamp jaw is connected to the clamp body by a link mechanism. The upper clamp jaw is moved up and down along a guide shaft provided on the clamp body by operating the connecting shaft of the upper link and the lower link by link driving means. Features clamping and unclamping work with clamp jaws It is intended to.

Accordingly, the upper clamp jaw is increased in clamping margin by the link mechanism and moves up and down stably along the guide shaft at all times, so that the work is reliably pressed and clamped by the upper clamp jaw and the lower clamp jaw. In addition, since it is mechanically compact, it is possible to reduce the weight and to cope with high-speed punching. In addition, since the clamp margin is large, even when the workpiece has a large warp, the workpiece smoothly passes between the upper clamp jaw and the lower clamp jaw and is securely clamped at a desired position during unclamping.

According to a second aspect of the present invention, there is provided a work clamp method for a punch press according to the first aspect of the present invention, wherein the work is clamped to the lower clamp via a pressing member provided on a lower surface of the upper clamp jaw. It is characterized in that the clamping force against the work is maintained substantially constant by urging means for urging the pressing member downward while pressing against the jaw.

Therefore, since the pressing member is constantly urged downward by the urging means with a constant force, the work can be clamped with a stable clamping force even if the plate thickness changes.

According to a third aspect of the present invention, there is provided a work clamp method for a punch press according to the first or second aspect of the present invention, wherein the clamp body is provided on the clamp body at a position of a rising point of the upper clamp jaw. The upper clamp jaw is accommodated in the cavity of the member, and both ends in the work transfer direction provided on the lower surface of the guard member are smoothly tapered by the upper tapered portion to allow the work to pass between the guard member and the lower clamp jaw. It is characterized by the following.

Therefore, at the time of unclamping, since the upper clamp jaw is accommodated in the cavity of the guard member at the position of the rising point, the work is guided by the tapered portion on the lower surface of the guard member without being caught by the upper clamp jaw. Pass smoothly.

According to a fourth aspect of the present invention, there is provided a method for clamping a work in a punch press according to the first, second or third aspect.
When the work passes between two work clampers provided before and after in the work transfer direction, the work is guided in the work transfer direction by rotatable rollers provided between upper clamp jaws of the two work clampers. It is characterized by doing.

Therefore, when the work passes between the two work clampers provided before and after in the work transfer direction, the work is smoothly fed by the rollers, and the work is not damaged and the work is not displaced.

According to a fifth aspect of the present invention, there is provided a work clamping apparatus in a punch press according to the present invention, wherein a lower clamp jaw fixed to a lower portion of a clamp body, and a lower clamp jaw is pressed via a work opposing above the lower clamp jaw. In a work clamp device in a punch press provided with a work clamper including an upper clamp jaw that moves up and down freely, a guide shaft for vertically guiding the upper clamp jaw is provided in the clamp body, and a link is provided to the upper clamp jaw. Link drive means for bearing the lower end of the lower link of the mechanism and the upper end of the upper link of the link mechanism to the clamp body, and actuating the connecting shaft between the upper link and the lower link to move the upper clamp jaw up and down. Is provided on the clamp body. It is intended.

Accordingly, the operation is the same as that of the first aspect, and the upper clamp jaw increases the clamping allowance by the link mechanism and moves up and down stably along the guide shaft at all times. It is securely pressed and clamped by the jaws. In addition, since it becomes compact, the weight is reduced, and it is possible to cope with high-speed punching. In addition, since the clamp margin is large, even when the workpiece has a large warp, the workpiece smoothly passes between the upper clamp jaw and the lower clamp jaw and is securely clamped at a desired position during unclamping.

According to a sixth aspect of the present invention, there is provided a work clamp device for a punch press according to the present invention, wherein a pressing member for pressing the lower clamp jaw is provided on a lower surface of the upper clamp jaw. In addition, an urging means for constantly urging the pressing member downward is provided.

Therefore, the pressing member is always urged downward by a constant force by the urging means, so that the work can be stably clamped even if the plate thickness changes. Clamped by force.

According to a seventh aspect of the present invention, there is provided a work clamp device for a punch press according to the present invention, wherein the upper clamp jaw is accommodated at a position of a rising point of the upper clamp jaw. A guard member having a hollow portion is provided on the clamp body, and a taper portion is provided on the lower surface of the guard member so that both ends in the work transfer direction are higher.

Therefore, the operation is the same as that of the third aspect, and at the time of unclamping, the upper clamp jaw is accommodated in the cavity of the guard member at the position of the ascending point, so that the work is not caught by the upper clamp jaw. The guard member smoothly passes through the tapered portion on the lower surface.

According to a eighth aspect of the present invention, there is provided a work clamp device for a punch press according to the fifth, sixth or seventh aspect.
Two work clampers are provided before and after in the work transfer direction,
It is characterized in that a rotatable roller is provided between the two work clampers below each upper clamp jaw located at the rising point to guide the work in the work transfer direction.

Therefore, when the work passes between two work clampers provided before and after in the work transfer direction, the work is smoothly fed by the rollers to damage the work. No work gap occurs.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a work clamping method and an apparatus therefor according to the present invention will be described below with reference to the drawings. The plate processing machine will be described with reference to, for example, a uniaxially movable punch press. However, the present invention is not limited to this model, and may be employed in, for example, a multi-press. In addition, a laser beam machine or another plate material machine may be used.

Referring to FIG. 10, FIG. 11 and FIG. 12, the uniaxially movable punch press 1 is provided with an upright portal-shaped frame 3, which is composed of a lower frame 5 and an upper frame. 7 are integrated with a side frame 9.

The frame 3 is provided with a plurality of upper linear guide rails 11 and lower linear guide rails 13 extending in the Y-axis direction (vertical direction in FIG. 11 and horizontal direction in FIG. 12). The punch block frame 17 and the die block frame 19 are connected to the guide rails 11 and 13 via a plurality of linear guides 15.
They are integrally connected by a C-shaped frame 21 having a mold shape. A punch block 23 having a plurality of punches P is mounted in the punch block frame 17,
A die block 25 having a plurality of dies D is mounted in the die block frame 19.

As a drive system for moving the integrally provided punch block frame 17 and die block frame 19 in the Y-axis direction, a ball screw 27 screwed to the C-shaped frame 21 in the Y-axis direction is provided. On one side of the ball screw 27, a Y-axis drive motor 29 is provided.

With the above configuration, when the Y-axis drive motor 29 is driven, the ball screw 27 rotates and the punch block frame 17 and the die block frame 19 are moved in the Y-axis direction via a nut member (not shown). Will be.

A ram carriage 31 is provided in the punch block frame 17 so as to be movable in the V-axis direction (the left-right direction in FIG. 12). More specifically, the ram carriage 31 is mounted on the upper linear guide rail 11 via a linear guide 33 and is movable in the V-axis direction. A drive system for moving the ram carriage 31 in the V-axis direction includes a drive system provided on the punch block frame 17.
Ball screw 37 connected to the output shaft of shaft drive motor 35
Are screwed into a nut member (not shown) mounted on the ram carriage 31.

With the above configuration, when the V-axis drive motor 35 is driven, the ball screw 37 rotates, and the ball screw 3
The ram carriage 31 is moved in the V-axis direction via a nut member screwed into the nut 7.

A ram cylinder 39 for hitting the punch P is movable in the ram carriage 31 in the U-axis direction (a direction perpendicular to the drawing in FIG. 12). As a drive system for moving the ram cylinder 39 in the U-axis direction, a ball screw connected to a U-axis starting motor is screwed to a nut member provided on the ram cylinder 39, although not shown.

With the above arrangement, when the U-axis drive motor is driven, the ram cylinder 3 is driven via the ball screw and the nut member.
9 is moved in the U-axis direction, and the ram cylinder 39 is moved in the V-axis direction, whereby the positioning is performed immediately above the desired punch P among the plurality of punches P. By moving the striker of the ram cylinder 39 up and down, a desired punch P is hit through the ram, whereby the work W is punched in cooperation with the punch P and the die D.

Referring to FIGS. 10 and 11, a front table 41 is provided on the front side of the frame 3 (the right side in FIGS. 10 and 11) in the X-axis direction, and the rear side of the frame 3 (the 10 and 11, a rear table 4 having the same structure as the front table 41.
3 is stretched in the X-axis direction. The front table 41 is provided with a carriage 47 having a first work clamp device 45 for clamping the work W, and the rear table 43 is provided with a carriage 51 having a second work clamp device 49 for clamping the work W. Is provided. X-axis guide rails 5 provided on the left and right (up and down in FIG. 11) both sides of the front and rear tables 41 and 43
3 and can be moved and positioned in the X-axis direction.

Next, the carriage 47 will be described in more detail. Note that the carriage 51 is the carriage 47
Since the structure is almost symmetric and has the same structure, the description is omitted.

Referring to FIGS. 10 and 11, the carriage 47 has two X-axes in which a carriage body 55 having a gate shape in the left-right direction of the front table 41 is provided on both sides in the width direction on the upper surface of the table base. The guide rail 53 is provided so as to run freely in the X-axis direction.

As shown in FIG. 10, a carriage ball screw 59 that rotates forward and backward by a carriage drive motor 57 extends in the X-axis direction below the carriage body 55. Frame 6
1 is provided with a nut member 63 screwed into the carriage ball screw 59 substantially at the center in the Y-axis direction.

Referring to FIG. 10, the first work clamping device 45 on the lower surface of the upper frame 65 of the carriage body 55 has two work clampers 67 for clamping one side edge of the work W on the front table 41. Is provided.

The work W gripped by the two work clampers 67 is moved and positioned in the X-axis direction by the carriage drive motor 57 rotating forward and reverse, and the carriage 47 travels. D is moved and positioned in the Y-axis direction, and approximately half of the work W is efficiently punched.

The work W that has been punched is
The carriage 51 on the rear side of the body frame of the punch press
Are clamped by the two work clampers 67 provided in the second work clamp device 49, and the work clamper 67 of the first work clamp device 45 unclamps the work W.

The work W gripped by the second work clamp device 49 is moved and positioned in the X-axis direction by the traveling of the carriage 51, and the punch P and the die D of the punch press 1 are moved and positioned in the Y-axis direction. The remaining half of the work W is efficiently punched.

Next, the structure of the work clamping device according to the main part of the embodiment of the present invention will be described with reference to the drawings. In particular, the first work clamp device 45 (hereinafter referred to as “clamp device” for convenience) will be described, and the second work clamp device 49 may have the same structure.

Referring to FIGS. 8 and 9, the clamp device 45 is provided with the upper frame 65 of the carriage body 55 described above.
A clamp frame 69 is provided on the lower surface of the clamp frame 69, and two work clampers 67 are provided before and after (both ends in the left-right direction in FIG. 8) in the work transport direction of the clamp frame 69, between the two work clampers 67. In order to smoothly guide the work W in the work transfer direction, a rotatable roller 71 is positioned above the clamp frame 69.
It is provided in.

Referring to FIGS. 1 to 3 in more detail, the work clamper 67 has a clamp body 73 in which a clamp body 73 is fixed to a clamp frame 69.
A lower clamp jaw 75 is fixed to a lower portion of the third clamp jaw 75. Above the lower clamp jaw 75, the upper clamp jaw 7
7 are provided to be movable up and down so as to approach and separate from the lower clamp jaw 75 facing each other. That is, the clamp body 73 is provided with two guide shafts 79 extending substantially in the vertical direction, and the base 81 of the upper clamp jaw 77 can slide up and down on the two guide shafts 79. Therefore, the upper clamp jaw 77 is always moved up and down along the guide shaft 79 stably and surely approaches and separates from the lower clamp jaw 75.

The upper clamp jaw 77 is connected to the upper link 8.
3 and a lower link 85 connected to the upper part of the clamp body 73 via a link mechanism 87. More specifically, as shown in FIG. 1, the upper end of the upper link 83 is supported on the upper part of the clamp body 73 by a support shaft 89, and the lower end of the lower link 85 is supported by the upper clamp jaw 77 on a support shaft 91. .

Further, a clamp cylinder 93 (link driving means) is supported on the clamp body 73 on the left side in FIG. 1 so as to be swingable in the vertical direction, and the tip of a piston rod 95 of the clamp cylinder 93 is connected to the upper link 83.
And the connection shaft 97 of the lower link 85, so that when the piston rod 95 of the clamp cylinder 93 contracts, the upper clamp jaw 77 descends and clamps the work W with the lower clamp jaw 75. .

When the piston rod 95 of the clamp cylinder 93 is extended and the upper clamp jaw 77 is located at the highest point, the allowance CH of the upper clamp jaw 77 and the lower clamp jaw 75 is large, for example, about 65 mm. It is configured to have dimensions.

With the above configuration, the upper clamp jaw 77 can be configured so that the clamping allowance CH is increased by the link mechanism 87. Therefore, even if the workpiece W has a large warp, the upper clamp jaw 77 is not caught when the workpiece is unclamped. It can pass smoothly between 77 and the lower clamp jaw 75. Moreover, since the upper clamp jaw 77 always moves up and down stably along the guide shaft 79, the work W
Is securely pressed and clamped by the upper clamp jaw 77 and the lower clamp jaw 75. Moreover, the clamping device 45
Is also compact in terms of structure, so it can be reduced in weight and can be used for high-speed punching.

A pressing member 99 for pressing the workpiece W against the lower clamp jaw 75 is provided on the lower surface of the upper clamp jaw 77, as shown in FIGS.
More specifically, the pressing member 99 is provided so as to be vertically movable so as to be guided by a plurality of bolt shafts 101 at intervals of about 2 mm on the lower surface of the upper clamp jaw 77 as shown in FIG. Further, an urging means for constantly urging the pressing member 99 downward is provided in the interval S. In this embodiment, the biasing means is a disc spring 1
Each of the bolt shafts 101 is provided so as to be fitted thereinto, but is not limited to the disc spring 103, and may be various springs such as leaf springs and coil springs, and elastic resins such as rubber. An elastic body may be used. Further, the dimension of the above-mentioned interval S is not limited to this.

With the above structure, since the pressing member 99 is constantly urged downward by a constant force by the disc spring 103 as the urging means, the work W can be stably clamped even if the plate thickness changes. Is clamped by

By the way, the piston rod 95 of the clamp cylinder 93 contracts and the upper clamp jaw 77 descends, and comes into contact with the work W with the lower clamp jaw 75 as shown in FIG. At this time, the pressing member 99
Is located at the lowest point as shown in FIG. When the piston rod 95 is further contracted, the pressing member 99 presses the work W against the lower clamp jaw 75 as shown in FIG. 5, so that the pressing member 99 is pressed against the disc spring 103 as shown in FIG. And the upper surface of the pressing member 99 is in contact with the lower surface of the upper clamp jaw 77 against the urging force of the upper clamp jaw 77. That is, the aforementioned interval S becomes zero.

Therefore, for example, in this embodiment, the thickness of the workpiece is 0.4 to 0.4 due to the urging force of the disc spring 103.
An almost constant clamping force is maintained in the range of 2.3 mm.

Referring to FIGS. 1 to 3, when the upper clamp jaw 77 is located at the highest point, the jaw guard member 107 having the hollow portion 105 for accommodating the upper clamp jaw 77 is provided. It is fixed to the clamp body 73. That is, the jaw guard member 107 is a flat plate formed in a U shape so as to surround the periphery of the upper clamp jaw 77 in a plane as shown in FIG. A tapered portion 109 is provided in which both ends in the work transfer direction are higher.

With the above configuration, at the time of unclamping, FIG.
Since the upper clamp jaw 77 is housed in the hollow portion 105 of the jaw guard member 107 at the position of the rising point as shown in FIG. It passes smoothly by the tapered portion 109 on the lower surface.

Referring to FIGS. 8 and 9, in the clamp device 45 of this embodiment, a plurality of rollers 71 are provided on the clamp frame 69 between the two work clampers 67 as described above.

More specifically, a plate-like roller guard member 111 similar to the above-mentioned jaw guard member 107 is provided between the jaw guard members 107 of the two work clampers 67 and the position of each jaw guard member 107. It is provided a little lower. On the lower surface of the roller guard member 111, a tapered portion 11 with both ends in the work transfer direction being higher.
3 are provided.

Further, the roller guard member 111 is provided with three roller holes 115, and each roller 71 is disposed so as to slightly protrude downward from the lower surface of each roller hole 115, and is clamped. The work W is rotatably provided on a support shaft 117 fixed to the frame 69 via a bearing 119 to guide the work W in the work transfer direction.

With the above configuration, when the work W passes between the two work clampers 67 provided before and after in the work transfer direction, the work W is smoothly fed by each roller 71 and the roller guard member 111. In addition, the work W can be prevented from being deformed by being caught, being damaged, and causing a work shift.

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

For example, in the above-described embodiment, the work tables for the work loading and unloading sides are each provided with a work movement positioning device, and the punch press for changing the work during the punching process has been described. The work clamping device of the present invention can be applied to the case where the work is moved and positioned by one work moving positioning device and the work is punched. For example, the present invention is also applicable to a case in which a workpiece of a material itself is warped or a workpiece of a semi-finished product that has already been punched is warped and this semi-finished product is subjected to another type of punching with a turret punch press. The work clamp device is effective.

[0071]

As will be understood from the above embodiments of the present invention, according to the first aspect of the present invention, the allowance for the upper clamp jaw can be increased by the link mechanism, and the link clamp mechanism is always stable along the guide shaft. You can move up and down in the state where it was done. The work can be reliably pressed and clamped by the upper clamp jaw and the lower clamp jaw. In addition, since the weight can be reduced by making it mechanically compact, it can cope with high-speed punching. In addition, since the clamp margin is large, even a workpiece having a large warp can smoothly pass between the upper clamp jaw and the lower clamp jaw during unclamping, and can be reliably clamped at a desired position.

According to the second aspect of the present invention, since the pressing member is constantly urged downward by the urging means with a constant force, it can be clamped with a stable clamping force even when the thickness of the work changes. .

According to the third aspect of the present invention, at the time of unclamping, the upper clamp jaw can be accommodated in the cavity of the guard member at the position of the ascending point, so that the work is not caught by the upper clamp jaw and the lower surface of the guard member is not caught. The taper allows smooth passage.

According to the fourth aspect of the present invention, when the work passes between the two work clampers provided before and after in the work transfer direction, the work can be smoothly fed by the rollers, so that the work is damaged or the work is displaced. No.

According to the fifth aspect of the present invention, the effect of the first aspect is the same as that of the first aspect, wherein the link mechanism can increase the allowance for the upper clamp jaw and can always move up and down in a stable state along the guide shaft. . The work can be reliably pressed and clamped by the upper clamp jaw and the lower clamp jaw. In addition, since the weight can be reduced by making it mechanically compact, it can cope with high-speed punching. In addition, since the clamp margin is large, even a workpiece having a large warp can smoothly pass between the upper clamp jaw and the lower clamp jaw during unclamping, and can be reliably clamped at a desired position.

According to the sixth aspect of the invention, the effect is the same as that of the second aspect, and since the pressing member is constantly urged downward by the urging means with a constant force, the thickness of the work is reduced. Even if it changes, it can be clamped with a stable clamping force.

According to the seventh aspect of the present invention, the effect is the same as that of the third aspect, and at the time of unclamping, the upper clamp jaw can be accommodated in the cavity of the guard member at the position of the rising point, so that the work can be lifted. The tapered portion on the lower surface of the guard member can smoothly pass without being caught by the clamp jaw.

According to the eighth aspect of the present invention, it is the same as the effect of the fourth aspect, and when the work passes between the two work clampers provided before and after in the work conveying direction, the work can be smoothly fed by the rollers. There is no possibility that the work is damaged or the work is displaced.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a side view of a work clamping device.

FIG. 2, showing an embodiment of the present invention, is a front view of a work clamping device.

FIG. 3, showing an embodiment of the present invention, is a plan view of a work clamping device.

FIG. 4 is a side view for explaining the operation of the work clamp device of FIG. 1;

FIG. 5 is a side view for explaining the operation of the work clamping device of FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 2;

FIG. 7 is a sectional view taken along line VI-VI in FIG. 2;

8 is a front view taken along line VIII-VIII in FIG.

FIG. 9 is a plan view taken along line IX-IX in FIG. 8;

FIG. 10 is a front view showing the entire punch press used in the embodiment of the present invention.

FIG. 11 is a plan view of FIG. 10;

FIG. 12 is a side view of the punch press according to the embodiment of the present invention.

FIG. 13 is a plan view of a conventional punch press.

[Explanation of symbols]

 Reference Signs List 1 punch press 3 frame 41 front table 43 rear table 45 first work clamp device 47 carriage 49 second work clamp device 51 carriage 55 carriage body 65 upper frame 67 work clamper 69 clamp frame 71 roller 73 clamp body 75 lower clamp jaw 77 upper Clamp jaw 79 guide shaft 83 upper link 85 lower link 87 link mechanism 93 clamp cylinder (link driving means) 95 piston rod 99 pressing member 103 disc spring (biasing means) 105 hollow portion 107 jaw guard member 109 taper portion 111 for roller Guard member 113 Taper

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B23Q 3/06 303 B23Q 3/06 303E

Claims (8)

[Claims] 1. A work comprising: a lower clamp jaw fixed to a lower portion of a clamp body; and an upper clamp jaw which is vertically opposed to the lower clamp jaw so that the lower clamp jaw can be pressed and separated via a work. In a work clamping method for a plate material processing machine provided with a clamper, the upper clamp jaw is connected to the clamp body by a link mechanism, and a connecting shaft of an upper link and a lower link of the link mechanism is operated by link driving means. A work clamping method in a plate material processing machine, wherein the upper clamp jaw is moved up and down along a guide shaft provided on the clamp body, and the work is clamped and unclamped by a lower clamp jaw and an upper clamp jaw. 2. A work piece is pressed against the lower clamp jaw via a pressing member provided on the lower surface of the upper clamp jaw, and a clamping force on the work is reduced by urging means for constantly urging the pressing member downward. 2. The method according to claim 1, wherein the workpiece is held substantially constant. 3. The upper clamp jaw is accommodated in a cavity of a guard member provided at a position of a rising point of the upper clamp jaw in the clamp body, and both ends in a work transfer direction provided on a lower surface of the guard member are higher. By the taper part of
3. The work clamping method according to claim 1, wherein the work is smoothly passed between the guard member and the lower clamp jaw. 4. When the work passes between two work clampers provided before and after in the work transfer direction, the work is rotated by a rotatable roller provided between upper clamp jaws of the two work clampers. 4. The work clamping method according to claim 1, wherein the work is guided in a work transfer direction. 5. A work comprising: a lower clamp jaw fixed to a lower portion of a clamp body; and an upper clamp jaw which is vertically opposed to the lower clamp jaw so as to be able to press and separate the lower clamp jaw via a work. In a work clamping device for a plate material processing machine provided with a clamper, a guide shaft for vertically guiding the upper clamp jaw is provided on the clamp body, and a lower end of a lower link of a link mechanism is supported on the upper clamp jaw and the link is provided. The clamp body is provided with link driving means for bearing an upper end of an upper link of the mechanism on the clamp body and operating a connecting shaft of the upper link and the lower link to move the upper clamp jaw up and down. Work clamp device in a plate processing machine. 6. The apparatus according to claim 1, wherein a lower surface of said upper clamp jaw is provided with a pressing member for pressing said lower clamp jaw, and an urging means for constantly urging said pressing member downward. A work clamping device in the plate processing machine according to claim 5. 7. A guard member having a cavity for accommodating the upper clamp jaw at a position of a rising point of the upper clamp jaw is provided on the clamp body, and both ends of the guard member in the work transfer direction are located on the upper surface. 7. The work clamping apparatus according to claim 5, wherein a tapered portion is provided. 8. Two work clampers are provided before and after in the work transfer direction, and are rotatable between the two work clampers to guide the work in the work transfer direction below each upper clamp jaw located at a rising point. 8. The work clamping apparatus according to claim 5, further comprising a plurality of rollers.