JP2000117368A - Clamp device, and positioning mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a clamper from being moved from a clamp base when a plate is positioned in a condition where an end part of the plate is clamped by a clamping device. SOLUTION: The center position of a first eccentric part 27 is advanced/ retracted to/from one side surface of a clamper 17 by the rotation of a first shaft 29 a first roller 31 to be abutted on one side surface of the clamper 17 is rotatably provided on the first eccentric part, a first locking screw 33 to lock the rotation of the first shaft 29 is provided so that the center position of a second eccentric part is advanced/retracted to/from the other side surface of the clamper 17 by the rotation of a second shaft 37, a second roller 39 to be abutted on the other side surface of the clamper 17 is rotatably provided on the second eccentric part, and a second locking screw 41 to lock the rotation of the second shaft 37 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device for clamping an end portion of a sheet material and a positioning mechanism for positioning the sheet material with respect to a processing portion of a plate processing machine (for example, a punch press, a laser processing machine, etc.).

[0002]

2. Description of the Related Art A conventional positioning mechanism will be briefly described as follows.

[0003] At an appropriate position, a carriage base movable in the front-rear direction is provided extending in the left-right direction. The carriage base is provided with a carriage movable in the left-right direction. The carriage is provided with a clamp device for clamping an end of the plate material. Here, the clamp device includes a clamp base, a clamper connected to the clamp base so as to swing vertically, and a clamp cylinder provided on the clamp base and swinging the clamper vertically.

Therefore, the clamper is swung so that the tip end of the clamper is lowered by the operation of the clamp cylinder. Thus, the end of the plate material can be clamped by the tip of the clamper and the tip of the clamp base. By moving the carriage in the front-rear direction and the left-right direction together with the clamp device via the carriage base, the plate material can be moved in the front-rear direction and the left-right direction, and the plate material can be positioned with respect to the processing portion.

[0005]

By the way, in order to keep the clamper swingable, a minute gap is formed between the clamp base and the side of the clamper, which is a portion connecting the clamper and the clamp base. It is. Therefore, when the plate is positioned while the end of the plate is clamped by the tip of the clamper and the tip of the clamp base, the clamper is slightly moved relative to the clamp base by an amount corresponding to the gap. May move. In this case, there is a problem that the displacement of the plate material with respect to the clamp base occurs, and the positioning accuracy of the plate material is deteriorated, so that the processing accuracy of the plate material cannot be improved.

Accordingly, an object of the present invention is to provide a clamp device in which a clamper does not move relative to a clamp base when positioning a plate material, and a positioning mechanism provided with the clamp device.

[0007]

According to a first aspect of the present invention, there is provided a clamping device for clamping an end portion of a plate material, wherein a clamp base is used as a base, and the clamper can swing up and down in the clamp base. The clamp base is provided with a clamp cylinder for swinging the clamper up and down, a first shaft having a first eccentric portion is provided on one side of the clamper in the clamp base, and the first shaft is rotated by the rotation of the first shaft. The center position of the first eccentric portion is configured to approach and separate from one side surface of the clamper, and the first eccentric portion is rotatably provided with a first roller capable of abutting on one side surface of the clamper. A first detent means for preventing rotation of the clamp base is provided. Similarly, a second shaft having a second eccentric portion is provided on the other side of the clamper in the clamp base. The rotation of the two shafts causes the center position of the second eccentric portion to approach and separate from the other side surface of the clamper, and the second roller capable of abutting the second eccentric portion on the other side surface of the clamper is rotatable. And a second detent means for preventing the second shaft from rotating.

According to the first aspect of the present invention,
By rotating the first shaft to bring the center position of the first eccentric portion closer to one side of the clamper, one side of the clamper can be pressed by the first roller from one side. Then, by making the first shaft unrotatable by the first rotation preventing means, the pressed state of the first roller against one side surface of the clamper can be maintained.

Further, the second shaft is rotated to bring the center position of the second eccentric portion closer to the other side of the clamper, so that the other side of the clamper is pressed by the second roller from the other side. Then, by making the second shaft unrotatable by the operation of the second rotation preventing means, the pressing state of the second roller against the other side surface of the clamper can be maintained.

After the first shaft and the second shaft are made unrotatable, the clamper is swung so that the tip end of the clamper is lowered by the operation of the clamp cylinder. Thus, the end of the plate material can be clamped by the tip of the clamper and the tip of the clamp base. Here, since the first roller and the second roller are rotatable, the first roller
The pressing action of the roller and the second roller does not restrict the vertical swing of the clamper.

After the end of the plate is clamped by the tip of the clamper and the tip of the clamp base, the plate is moved in the horizontal direction by moving the clamp device in the horizontal direction approaching or moving away from the processing portion. The positioning of the plate material can be performed. At this time, since the pressed state of the first roller against one side surface of the clamper and the pressed state of the second roller against the other side surface of the clamper are maintained, the clamper does not move with respect to the clamp base.

According to a second aspect of the present invention, in a positioning mechanism for positioning a plate material with respect to a processing portion of a plate processing machine, a carriage movable in a horizontal direction which approaches and separates from the processing portion is provided. The carriage is provided with the clamp device according to the first aspect.

According to the second aspect of the present invention,
In addition to the operation according to the first aspect of the present invention, the clamp device can be moved in the horizontal direction together with the carriage by moving the carriage in the horizontal direction approaching and moving away from the processing portion.

[0014]

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

Referring to FIG. 4, a positioning mechanism 1 according to an embodiment of the present invention includes a fixed table 3 in a plate processing machine and a pair of movable tables movable in a front-rear direction (downward and upward in FIG. 4). The plate material W supported by 5L and 5R is positioned with respect to the processing portion 7, and will be described in detail below.

At the rear of the pair of movable tables 5L, 5R, a carriage base 9 is provided extending in the left-right direction (left-right direction in FIG. 4). The carriage base 9 is provided with a first servomotor M1 and a first servomotor M1. By the operation of the ball screw S1, it moves in the front-rear direction integrally with the pair of movable tables 5L, 5R. A carriage 11 is provided on the carriage base 9 so as to be movable in the left-right direction. The carriage 11 is moved in the left-right direction by the operation of the second servomotor M2 and the second ball screw S2.
The carriage 11 is provided with a plurality of clamping devices 13 for clamping an end of the plate material W.

Referring to FIG. 1 to FIG.
Is described in detail as follows.

That is, the clamp device 13 is based on the clamp base 15.
In FIG. 1, a clamper 17 is vertically moved via a hinge shaft 19 (in FIG.
In the vertical direction). A clamp cylinder 23 having a vertically movable piston rod 21 is provided at the base of the clamp base 15 in order to swing the clamper 17 in the vertical direction. Connected to the tail end. The clamp base 15 is provided with an abutment member 25 to which the end surface of the plate material W can abut.

On the left side of the clamper 17 in the clamp base 15 (the upper side in FIG. 1, the rear side in FIG. 2 toward the paper surface, and the left side in FIG. 3), a pair of first
A first shaft 29 having an eccentric portion 27 is provided, and the rotation of the first shaft 29 causes the center position of the first eccentric portion 27 to approach and separate from the left side surface of the clamper 17. Each of the first eccentric portions 27 is provided with a first roller 31 rotatably provided in contact with the left side surface of the clamper 17, and each of the first rollers 31 is preferably made of an elastic material such as urethane. In order to make the first shaft 29 unrotatable, a plurality of first detent screws 33 are screwed on the left side of the clamper 17 in the clamp base 15. The first shaft 29 is configured to be pressable from the left side.

Similarly, a second shaft 37 having a pair of second eccentric portions 35 is provided on the clamp base 15 on the right side of the clamper 17, and the second shaft 37 rotates to rotate the second eccentric portions 35. The center position is configured to approach and separate from the right side surface of the clamper 17. Each of the second eccentric portions 35 is rotatably provided with a second roller 39 that can abut on the right side surface of the clamper 17, and each of the second rollers 39 is preferably made of an elastic material such as urethane. In order to make the second shaft 37 unrotatable, a plurality of second detent screws 41 are screwed on the right side of the clamper 17 in the clamp base 15, and the tip of each second detent screw 41 is The second shaft 37 is configured to be pressable from one side.

Next, the operation of the embodiment of the present invention will be described.

By rotating the first shaft 29 to bring the center position of the first eccentric portion 27 closer to the left side of the clamper 17, the first roller 31 presses the left side of the clamper 17 from the left side. Can be. Then, each first detent screw 33 is screwed into each first detent screw 3
By pressing the first shaft 29 from the left side with the tip end of the third roller 3, the first shaft 29 cannot be rotated and the pressing state of the first roller 31 against the left side surface of the clamper 17 can be maintained.

Similarly, by rotating the second shaft 37 to bring the center position of the second eccentric portion 35 closer to the right side surface of the clamper 17, the second roller 39 is rotated from the right side.
The right side of the clamper 17 is pressed. Then, the second shafts 37 are screwed together and the second shaft 37 is pressed from the right side by the tip of the second shafts 41, thereby making the second shaft 37 unrotatable. The pressing state of the second roller 39 against the right side surface of the clamper 17 can be maintained.

After the first shaft 29 and the second shaft 37 are made unrotatable, the clamper 17 is swung by the operation of the clamp cylinder 23 so that the tip end of the clamper 17 is lowered. Thus, the distal end of the plate material W can be clamped by the distal end of the clamper 17 and the distal end of the clamp base 15. Here, since each first roller 31 and each second roller 39 are rotatable, respectively,
The pressing action of the roller 31 and the second roller 39 does not restrict the vertical swing of the clamper 17.

The tip of the clamper 17 and the clamp base 1
5, the carriage base 9 is moved in the front-rear direction integrally with the pair of movable tables 5L and 5R by driving the first servo motor M1, and the second servo motor is driven. By moving the carriage 11 in the left-right direction by driving M2, the clamp device 13 is moved in the front-rear direction and the left-right direction. Thereby, the plate material W is moved in the front-back direction and the left-right direction,
The plate material W can be positioned with respect to the processing portion 7.
At this time, the first roller 31 with respect to the left side surface of the clamper 17
Since the pressing state of the second roller 39 and the pressing state of the second roller 39 against the right side surface of the clamper 17 are maintained, the clamper 17 does not move with respect to the clamp base 15.

According to the embodiment of the present invention as described above, when the positioning of the plate material W is performed while the end portion of the plate material W is clamped by the clamp device 13,
Since the clamper 17 does not move with respect to the clamp base 15, there is no displacement of the plate material W with respect to the clamp base 15, and high-precision positioning of the plate material W and, therefore, high-precision processing of the plate material W are performed. Can be.

[0027]

According to the first or second aspect of the present invention, when the plate is positioned while the end of the plate is clamped by the clamp device, the clamper is attached to the clamp base. Because they never move
There is no displacement of the plate material with respect to the clamp base, and highly accurate positioning of the plate material, and thus, highly accurate processing of the plate material can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a clamp device.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a view along a line III-III in FIG. 1;

FIG. 4 is a diagram showing an embodiment in which a positioning mechanism is provided on a table.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positioning mechanism 3 Fixed table 5L, 5R Movable table 7 Processing part 9 Carriage base 11 Carriage 13 Clamping device 15 Clamp base 17 Clamper 19 Hinge shaft 21 Piston rod 23 Clamp cylinder 25 Butt member 27 1st eccentric part 29 1st shaft 31 1st roller 33 1st detent screw 35 2nd eccentric part 37 2nd shaft 39 2nd roller 41 2nd detent screw

Claims (2)

[Claims] 1. A clamp device for clamping an end portion of a plate material, comprising a clamp base as a base, a clamper connected to the clamp base so as to be vertically swingable, and a clamp base swinging the clamper up and down. A clamp cylinder is provided, and a first shaft having a first eccentric portion is provided on one side of the clamper in the clamp base, and a center position of the first eccentric portion approaches one side surface of the clamper by rotation of the first shaft. The first eccentric portion is provided with a first roller capable of abutting on one side surface of the clamper so as to be rotatable, and a first detent means for preventing the first shaft from rotating is provided. A second shaft having a second eccentric portion is provided on the other side of the clamper in the clamp base, and the center position of the second eccentric portion is adjusted by rotation of the second shaft. The second eccentric portion is rotatably provided with a second roller capable of abutting on the other side surface of the clamper so that the second shaft can not rotate. A clamping device comprising a stopping means. 2. A positioning mechanism for positioning a plate material with respect to a processing portion of a plate processing machine, wherein a carriage movable in a horizontal direction which approaches and separates from the processing portion is provided, and the carriage according to claim 1 is provided. A positioning mechanism comprising a clamp device.