JP2000158068A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a rapid avoidance action, and to handle even a small work by moving a holding means to hold the work by an avoidance mechanism in the horizontal direction orthogonal to a side at which the work is held. SOLUTION: A piston rod 37 is contracted, and a lock pin 39 is drawn out of a hole formed in an upper surface of a clamp lug 5. A piston rod 43 is expanded to release a work W from the clamp lug 5. A piston rod 17 is expanded, a link arm 25 is turned, and a guide member 27 is allowed to slide in a guide 29 along the moving axis X. A connection member 47 is disconnected from a connection pin 45, and moved along the moving axis X, and the clamp lug 5 is pulled in a lower part of the clamp body from the inside of a working head 75. The work W is machined by the working head 75. Then, the clamp lug 5 is moved along the moving axis X by the reverse action of the mechanism, and the work W is again held by the clamp lug 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a clamping device.

[0002]

2. Description of the Related Art When a workpiece W is machined by a punching press machine, if a clamp is positioned on a die and is machined, the clamp is punched out by a punch and damaged.

In order to cope with such a case, as a clamp avoiding device, conventionally, a clamp jaw 103 of a clamp 101 releases a workpiece W as shown in FIG. There is known one that avoids turning to the horizontal side.

[0004]

However, in such a conventional avoiding device, sufficient avoidance cannot be performed in the turret type machining head in order to avoid lateral turning, and the work W in the avoiding state cannot be avoided. There was a problem that the passing speed in the turret had to be reduced.

Further, since the swing type is used, the impact at the time of the avoiding operation is large, causing problems such as displacement of the work W and generation of play, and there is a problem that the work W cannot be used for the work W having a relatively small size.

The present invention has been made in view of such conventional problems, and it is not necessary to reduce the moving speed of the work W even in the turret, it is possible to perform the avoiding operation quickly, and the size of the work is relatively small. An object of the present invention is to provide a clamp device that can handle a small work.

[0007]

According to a first aspect of the present invention, there is provided a clamp device for holding a workpiece on a clamp body, and moving the gripping means in a horizontal direction perpendicular to a side of the workpiece to be gripped. And an avoidance mechanism.

In the clamp device according to the first aspect of the present invention,
When the gripper holding the work is released from the work to avoid the work, the avoiding mechanism moves the gripper in a horizontal direction orthogonal to the side of the work. This makes it possible to quickly perform the avoiding operation and the operation of gripping the work again,
The yield and productivity can be improved.

According to a second aspect of the present invention, in the clamping device according to the first aspect of the present invention, the avoiding mechanism has one end coupled to the gripping means, and the pivoting link arm pivotally moves the gripping means so as to avoid the gripping means. And a cylinder coupled to an end of the link arm opposite to the end coupled to the gripping means, and for rotating the link arm.

In the clamp device according to the second aspect of the present invention,
The avoidance mechanism causes the cylinder to pivot the link arm, and the lever arm moves the gripping means by leverage. As a result, the apparatus can be made compact, and it can be used for a work having a relatively small size.

According to a third aspect of the present invention, there is provided the clamp device according to the second aspect, further comprising a damper for absorbing an impact generated when the gripping means moves, whereby the gripping means is provided with a workpiece. The impact at the time of gripping the workpiece can be reduced so that the position at which the workpiece is gripped can be prevented from shifting, and the quality of processing can be improved.

According to a fourth aspect of the present invention, in the clamp device according to the first aspect, the avoidance mechanism is extended in a direction parallel to the avoidance movement direction and is engaged with the gripping means. A rotating wheel for feeding the means, and a driving means for driving the rotating wheel.

[0013] In the clamp device according to the fourth aspect of the present invention,
The avoidance mechanism drives the driving means to rotate the rotating wheel, and the rotating wheel gives a feed to the feeding means, and the feeding means moves the gripping means to avoid the movement. Thereby, the movement of the gripping means can be made smoother and the impact can be reduced, and the quality of processing can be improved.

According to a fifth aspect of the present invention, in the clamp device according to any one of the first to fourth aspects, the clamp body is provided with:
A lock mechanism for inserting and removing a lock pin at a proper position of the gripping means is provided, whereby the gripping force of the gripping means for gripping the work can be increased, and the quality of processing can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The clamp device 1 of the present invention is mounted on a turret punching press machine 71 as shown in FIG. 1 for its plan view and FIG. 2 for its front view. This processing machine 7
Reference numeral 1 denotes an upright gate-shaped main body frame 73, a processing head 75 installed in the main body frame 73 and performing a punching press on a plate-shaped work W, and a processing head 75.
And a work movement positioning device 77 for moving and positioning the work W to an appropriate position in order to process the work W.

As shown in FIGS. 1 and 2, the processing head 75 is suspended from the main frame 73 so as to be rotatable in the horizontal direction, and has a disk-shaped punch block 79 on which a punch P is mounted along the outer periphery. A disk-shaped die block 81 is provided rotatably below the punch block 79 and has a die D mounted at a position facing the punch P of the punch block 79. And these punch blocks 7
9 and the die block 81 are coaxially rotated at the same speed by a head rotation motor 83 built in the lower part of the main body frame 73.

A ram device 85 is installed above the punch block 79 at a position where one of the punches P can be hit. The ram 87 of the ram device 85 has a cylinder 89
It moves up and down.

The work moving positioning device 77 extends in the direction of the movement axis Y and is movably supported in the direction of the movement axis X orthogonal thereto. Attached,
The vehicle includes a front table 92 and a rear table 93 on which the work W is placed, and a carriage 94 movably attached to a carriage base 91 in the movement axis Y direction. Two carriages 1 according to the present invention are mounted on the carriage 94 so as to be arranged in the moving axis Y direction.
The distance between these two clamping devices 1 can be adjusted as appropriate.

As shown in FIG.
Is coupled to a ball screw 96 so as to move in the movement axis X direction by driving an X-axis movement motor 95. Also, as shown in FIG. 1, the carriage 94 is coupled to a ball screw 98 so as to move in the movement axis Y direction by driving a Y-axis movement motor 97. With these mechanisms, the work W placed on the front table 92 and the rear table 93 and held by the clamp device 1 can be moved and positioned two-dimensionally in both directions of the movement axis X and the movement axis Y.

FIG. 3 is a front view of a first embodiment of the clamp device 1 of the present invention, and FIG. 4 is a right side view thereof. The clamp device 1 according to this embodiment includes a clamp claw 5 provided horizontally below a box-shaped clamp body 3 for gripping a work W, and a clamp claw 5 extending in its extending direction (moving axis X direction shown in FIG. 4). ) Is provided. The clamp body 3 is attached to the carriage 94 of the processing machine 71 described above.

As shown in FIG. 4, the clamp claw 5 comprises an upper clamp jaw 11 and a lower clamp jaw 13 which are rotatably connected to each other by a hinge 9. The work W is sandwiched and gripped by the upper and lower clamp jaws 11 and 13.

As shown in FIGS. 3 and 4, the clamp avoiding device 7 includes an avoiding cylinder 15 installed above the clamp body 3 and a Y-axis orthogonal to the moving axis X from a piston rod 17 of the avoiding cylinder 15. A connecting pin 19 extending in the direction, and two link arms 25 having an elongated hole 21 at the upper end thereof connected to the connecting pin 19 and pivotally connected to both side surfaces of the clamp body 3 by hinge pins 23. ing.

Guide members 27 are provided on both sides of the upper clamp jaw 11, and the guide members 27 are supported by guides 29 provided at the lower portion of the clamp body 3 so as to be movable in the movement axis X direction. A connecting pin 31 extending along the Y axis from the left and right guide members 27 in FIG.
Are connected to elongated holes 33 provided at the lower ends of the left and right link arms 25. When the avoidance cylinder 15 is driven to rotate the link arm 25, the lever member causes the guide member 27 to slide in the guide 29 in the direction of the movement axis X, and accordingly the clamp claw 5 is also moved to the guide member 2.
It moves by the same distance in the same direction as 7.

A lock pin cylinder 35 is provided on the front surface of the clamp body 3 and its piston rod 37 is provided.
The two lock pins 39 are attached to the tip of. Then, the lock pin 39 is connected to the upper clamp jaw 11.
By inserting the clamp claw 5 into a regular position for gripping the work W by inserting the work into the hole formed on the upper surface of the work, the force of the clamp claw 5 for fixing the work W is increased.

The lock pin cylinder 35 and the avoidance cylinder 15 are of a double acting type or a spring return type.
Its structure allows the operation to be confirmed by a sensor.

FIG. 5 shows A to A 'shown in FIG. 3 of the present embodiment.
FIG. 6 is a sectional view taken along the line BB ′ of FIG. 4. As shown in FIGS. 5 and 6, a clamp cylinder 41 is installed inside the clamp body 3, and a lateral columnar connecting pin 45 is provided at the tip of the piston rod 43. The connecting pin 45 is engaged with a connecting member 47 provided on the upper clamp jaw 11 and having a semicircular hole that is opened on the front side (left side in FIG. 5). The connecting pin 45 and the connecting member 47 are connected to the clamp claw 5.
Are disengaged by moving in the direction of the movement axis X.

The clamp claw 5 grips and releases the work W by driving the clamp cylinder 41 while the connecting pin 45 and the connecting member 47 are engaged to extend and retract the piston rod 43.

Next, the operation of the clamp device 1 according to the present embodiment will be described.

First, the interval between the clamp devices 1 is appropriately adjusted. Then, at the home position of the workpiece movement positioning device 77 of the processing machine 71, the plate-shaped workpiece W is carried onto the front table 92 of the processing machine 71. Next, the work W is moved to the upper clamp jaw 11 and the lower clamp jaw 13.
, And the workpiece W is positioned by abutting on the origin in both directions of the movement axis X and the movement axis Y. And connecting pin 4
5 and the connecting member 47 are engaged with the clamp cylinder 4.
1 is driven to contract the piston rod 43, and the workpiece W is moved between the upper clamp jaw 11 and the lower clamp jaw 13.
To be gripped.

Further, the cylinder 35 for the lock pin is driven to extend the piston rod 37, and the lock pin 39 is inserted into a hole formed on the upper surface of the upper clamp jaw 11.
This prevents the clamp claws 5 from wobbling, and improves the positioning accuracy of the work W.

Next, the carriage 94 is moved and positioned in the movement axis Y direction by driving the Y-axis movement motor 97 shown in FIG. 1, and the X-axis movement motor 95 shown in FIG. And the rear table 93 are moved and positioned in the moving axis X direction. Thus, a desired processing position of the work W is set between the punch P and the die D of the processing head 75.

Next, the head rotation motor 83 shown in FIG.
Is driven to rotate the punch block 79 and the die block 81, and the appropriate punch P and die D are set below the ram 87. Then, the cylinder 89 is driven, and the ram 8 is driven.
7, the punch P is hit. Thus, the work W
The part sandwiched between the punch P and the die D is subjected to punching press working. This processing may be performed at several places and several types on the same work W.

FIG. 7 is a diagram showing the avoiding operation of the clamp device 1. As shown in FIG. 11A, when the clamp claw 5 is positioned between the punch P and the die D while the work W is being processed by the processing head 75, the clamp claw 5 is moved from that position to prevent damage. It needs to be avoided.

At this time, first, the lock pin cylinder 35 is driven to contract the piston rod 37, and the lock pin 39 is pulled out from the hole formed on the upper surface of the upper clamp jaw 11. Further, the clamp cylinder 41 is driven to extend the piston rod 43, and the work W is released from the clamp claw 5.

Next, as shown in FIG. 3B, when the avoiding cylinder 15 is driven to extend the piston rod 17, the link arm 25 pivots, and the guide member 27 moves in the guide 29 by leverage. Slide from left to right along axis X. Accordingly, the connecting member 47 is connected to the connecting pin 4.
5, the clamp claw 5 moves from left to right along the movement axis X. In other words, the clamp claw 5 is
Avoid pulling it into the lower part of the clamp body 3 from inside.

When the clamp claw 5 is thus avoided from within the processing head 75, the processing head 75 processes the portion of the work W which has been gripped by the clamp claw 5. When the machining of that part is completed, the clamp claw 5 is moved from right to left along the movement axis X by the reverse operation of the above-described mechanism, and the work W is gripped again. Then, the work W is firmly fixed to the clamp claw 5 by the lock pin 39.

As described above, the clamp device 1 of the present embodiment
According to the above, the clamp claw 5 moves so as to be drawn into the lower portion of the clamp device 1 and avoids from the processing head 75,
It can be easily avoided even with a turret type processing head.

Then, the clamp claw 5 quickly releases the work W to avoid the work head 75 and can grasp the work W again. Therefore, even when the clamp claw 5 passes through the inside of the work head 75, the moving speed of the work W is reduced. No need to do. Thereby, yield and productivity can be improved.

Further, since this function is utilized, the apparatus can be made compact, and a work W having a relatively small size can be handled. Also, the two lock pins 39 can reproduce the positional accuracy of the clamp claw 5 and the work W even when the clamp claw 5 again grips the work W. Thereby, the quality of processing can be improved.

As shown in FIG. 8, a damper 51 for absorbing a shock when the clamp claw 5 returns to grip the work W again can be installed inside the clamp body 3. Thereby, the impact when the clamp claw 5 returns to the work W gripping position to grasp the work W again can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a front view of the second embodiment of the present invention, and FIG. 10 is a right side view thereof. The clamp device 53 according to the present embodiment is characterized by the clamp avoiding device 7 in the clamp device 1 according to the first embodiment. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The clamp avoiding device 55 of the present embodiment
An avoidance motor 57 installed on the upper part of the clamp body 3;
The shaft 61 that is screwed with the pinion 59 of the avoidance motor 57 and extends in the Y-axis direction, and pulleys 63 attached to both ends of the shaft 61 are provided. When the avoidance motor 57 is driven, the pulley 63 rotates.

Below the side surface of the clamp body 3, two pulleys 65 are rotatably mounted separated from each other in the direction of the movement axis X. The upper pulley 63 and the lower two pulleys 65 are connected by a timing belt 67. The portion of the timing belt 67 connecting the two pulleys 65 is stretched in parallel with the movement axis X.

A transmission member 69 is provided on both sides of the upper clamp jaw 11, and the transmission member 69 is supported by a guide 29 provided at a lower portion of the clamp body 3 so as to be movable in the movement axis X direction. The upper end of the transmission member 69 has a shape that meshes with the timing belt 67.
When the avoidance motor 57 is driven, three pulleys 6
3 and 65 rotate to feed the timing belt 67, and the transmission member 69 slides in the guide 29 in the direction of the movement axis X. Accordingly, the clamp claw 5 also moves by the same distance in the same direction as the transmission member 69.

That is, similarly to the avoidance operation of the first embodiment shown in FIG.
In 3 also, the timing belt 67 is fed by driving the avoiding motor 57, so that the clamp claw 5 can be avoided from being pulled into the lower portion of the clamp body 5 from within the processing head 75. Then, the work W can be gripped by the clamp claw 5 again by the same operation.

In this embodiment, three pulleys 6
Although the timing belts 3 and 65 are linked by the timing belt 67, the pulleys 63 and 65 may be replaced by a sprocket and the timing belt 67 may be replaced by a chain.

The clamp mechanism of the clamp claw 5 is the same as that of the first embodiment shown in FIGS.

As described above, with the clamp device 53 including the clamp avoiding device 55 of the present embodiment, the same operation as that of the above-described first embodiment can be performed, and the same effect can be obtained.

Furthermore, according to the clamping device 53 of the present embodiment, the operation using the mechanism using the timing belt 67 avoids the clamp claws 5 and again grips the work W, so that the operation is smoother and the impact is reduced. can do. Thus, it is possible to prevent the position of the clamp claw 5 from shifting when the workpiece W is gripped again, thereby improving the processing quality.

[0050]

As described above, according to the clamp device of the first aspect of the present invention, the avoiding operation and the operation of grasping the workpiece again can be performed quickly, and the yield and productivity can be improved.

According to the second aspect of the present invention, the apparatus can be made compact and can cope with a work having a relatively small size.

According to the third aspect of the present invention, it is possible to prevent the displacement of the position where the work is gripped by reducing the impact when the gripping means grips the work, thereby improving the processing quality.

According to the fourth aspect of the present invention, the movement of the gripping means can be made smoother and the impact can be reduced, and the quality of processing can be improved.

According to the fifth aspect of the present invention, the force of the gripping means for gripping the work can be increased, and the quality of the processing can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a turret punching press machine equipped with a clamp device of the present invention.

FIG. 2 is a sectional view of the processing machine.

FIG. 3 is a front view of the first embodiment of the clamp device of the present invention.

FIG. 4 is a right side view of the embodiment.

FIG. 5 is a cross-sectional view along A-A 'of the embodiment.

FIG. 6 is a cross-sectional view taken along the line B-B ′ of the embodiment.

FIG. 7 is a diagram showing an avoidance operation in the embodiment.

FIG. 8 is a cross-sectional view when the damper according to the embodiment is installed.

FIG. 9 is a front view of a clamp device according to a second embodiment of the present invention.

FIG. 10 is a right side view of the embodiment.

FIG. 11 is an explanatory view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp device 3 Clamp main body 5 Clamp claw 7 Clamp avoidance device 9 Hinge 11 Upper clamp jaw 13 Lower clamp jaw 15 Avoidance cylinder 17 Piston rod 19 Connection pin 21 Long hole 23 Hinge pin 25 Link arm 27 Guide member 29 Guide 31 Connection pin 33 Slot 35 Cylinder for lock pin 37 Piston rod 39 Lock pin 41 Clamp cylinder 43 Piston rod 45 Connecting pin 47 Connecting member 51 Damper 53 Clamping device 55 Clamp avoiding device 57 Avoiding motor 59 Pinion 61 Shaft 63 Pulley 65 Pulley 67 Timing belt 69 Transmission member 71 Processing machine 73 Body frame 75 Processing head 77 Work movement positioning device 79 Punch block 81 Die block 83 Head rotation Over data 85 ram 87 ram 89 cylinder 91 carriage base 92 front table 93 rear table 94 carriage 95 X-axis movement motor 96 ball screw 97 Y-axis moving motor 98 ball screw W workpiece P punch D die

Claims (5)

[Claims] 1. A clamp apparatus comprising: a clamping body for gripping a workpiece on a clamp body; and an avoidance mechanism for avoiding and moving the gripping means in a horizontal direction perpendicular to a side on which the workpiece is gripped. 2. The swinging mechanism according to claim 1, wherein one end of the linking mechanism is coupled to the gripping means, and the pivotable link arm pivotally moves the gripping means so as to avoid the gripping means. 2. The clamping device according to claim 1, further comprising: a cylinder coupled to the opposite end for pivoting the link arm. 3. The clamping device according to claim 2, further comprising a damper for absorbing an impact generated when the gripping means moves. 4. The avoiding mechanism includes: a belt-shaped feeding means stretched in parallel with the avoiding movement direction and engaged with the gripping means; a rotating wheel for feeding the feeding means; The clamping device according to claim 1, further comprising a driving unit configured to rotate the driving device. 5. The clamp device according to claim 1, wherein the clamp body is provided with a lock mechanism for inserting and removing a lock pin at a regular position of the gripping means.