JPH0529780Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention uses numerical control to move one end edge of a board onto the work table of a board processing machine before moving and positioning the board to the processing position. This relates to a clamp device that is gripped and pulled into a reference position for numerical control.

(Prior Art) First, the conventional technology will be explained based on FIG. 2. In the blanking shear shown as an example of the plate processing machine 1, the movable upper blade 3 and the fixed lower blade 5 are provided correspondingly while maintaining the exaggerated clearance d,
The plate-shaped work W is placed on the work table 7 in front of it.
The materials are transported to the top by various means of transport.

In front of the work table 7 (lower in FIG. 2), a carriage base 9 is moved and positioned in the Y-axis direction by a numerically controlled movement and positioning means (not shown), and a carriage 11 is mounted on the carriage base. Movement and positioning is performed in the X-axis direction by a numerically controlled movement and positioning means that omits.

In the example shown, two clamp devices 13, 13 are provided on the plate processing machine 1 side of the carriage 11, and the throat of the fixed jaw is provided in front of the workpiece W (lower side in FIG. 2). ) An abutment gauge 15 for abutting the edge is provided.

Therefore, the one-dot chain line connecting the surface of the plate material processing machine 1 side of the abutment gauge 15 when the carriage base 9 is located at the frontmost position corresponds to (Y) in the numerical control.
= 0) is the Y ₀ reference line.

In addition, an X-axis gauge 17 that can freely protrude and retract from the table surface is provided near the end of the work table 7 on the sheet material loading side, and the extension line of the surface on the sheet material processing machine 1 side is the X ₀ reference line of (X = 0). , the intersection of the X ₀ reference line and the Y ₀ reference line is the reference origin 1 where (X=0), (Y=0)
It is called 9.

In the above configuration, the work W placed on the work table 7 is connected to the X ₀ reference line and the Y ₀ by some means.
You must move until the two sides match the reference line. A pull-in clamp device 21 as shown in FIGS. 2 and 3 is provided for this purpose.

FIG. 3 shows the fluid pressure cylinder 23 and its first piston rod 25 that drive the retracting clamp device 21.
A second piston rod 27 is shown, and a base 31 for supporting a lower arm 29 is provided at the tip of the first piston rod 25.

The lower arm 29 has a chevron shape with a protruding upper part, and is pivoted to the base 31 with a pin 33 implanted in the lower part of the vertical leg, and another implanted pin 35 is installed in the base 31 above. It is movable inside the round hole 37.

A bell crank-shaped movable upper arm 39 is pivotally attached to the upper protrusion of the lower arm 29, and its lower leg end is connected to the tip of the second piston rod 27 described above.

Conventional movable upper arm 39 and fixed lower arm 2
Grips 41, 41 each having sawtooth grooves are provided on the opposing surfaces of the tips of the handles 9 to prevent the workpiece W from slipping.

(Problems to be Solved by the Invention) The conventional drawing-in clamp device 21 described above has, for example, a fluid pressure cylinder 23 whose lower front side is supported by a fluid pressure cylinder (not shown) to move up and down, and which is supported by a rotary rod that is freely rotatable. 43 to change the orientation of the retracting clamp device 21.

That is, on the back side of the carriage 11 at the origin position of the work table 7 shown in FIGS. 2 and 3, there is a window provided with a space for the stroke of the upper and lower arms 29 and 39 to protrude upward and grasp and pull in the work W. A section 45 is provided at the free end of the fluid pressure cylinder 23 (the left end in FIG. 3), and the arrow A shown in FIG.
A bomb device 47 is provided which maintains the retraction direction of (approximately 55 degrees relative to the X ₀ reference line in FIG. 2 as an example).

In the conventional pull-in clamp device 21 described above,
When trying to align two adjacent sides of the workpiece W with the _X0 reference line and the _Y0 reference line, the gripper 41 and the workpiece W
Since the relative angular relationship between the workpiece W and the X-axis gauge 17 does not change, problems may occur, such as whichever of the left and right clamping devices 13, 13 of the work W and the X-axis gauge 17 come into contact with each other first is bent or torn. It is.

That is, as is clear from FIGS. 2 and 3, the conventional pull-in clamp device 21 moves in a direction intersecting the X ₀ reference line and the Y ₀ reference line (in the direction of arrow A in FIG. 2). It is oriented by a bullet device 47 so as to draw in the workpiece W, and is horizontally rotatably supported at the rotation rod 43.

Therefore, the window portion 4 provided on the work table 7
The pull-in clamp device 21 is made to protrude from the upper and lower arms 3 and the workpiece W on the work table 7 is
After gripping with the grippers 41 and 41 provided on the workpieces 9 and 29, the two orthogonal sides of the workpiece W are moved to the reference lines X ₀ and Y ₀ in the X and Y directions by pulling in the direction of the arrow A in FIG. It makes it match.

Since the two sides of the work W placed on the work table 7 are not necessarily parallel to the reference line, for example, one side of the work W may come into contact with the abutment gauge 15 of the right clamp device 13 shown in FIG. , when the workpiece W is separated from the left clamping device 13 and attempts to bring the work W into contact with the left clamping device 13 by the further pulling action of the pulling-in clamping device 21, the workpiece W is separated from the right clamping device 13. It will be rotated counterclockwise using the portion 13 as a fulcrum.

At this time, the gripper 4 of the pull-in clamp device 21
1 and 41 firmly grip the workpiece W so that it does not slip, so when the workpiece W is rotated in the counterclockwise direction, the pull-in clamp device 21 holds the elastic device 4
7 tends to be rotated. Therefore, there is a problem that the work W may be strained at the grippers 41, 41, and the work W may be damaged.

(Means for solving the problem) In view of the conventional problems as mentioned above, the present invention
A clamping device that can freely come out and retract from a window provided on a work table of a plate processing machine, and can grip a work on the work table and pull the work in a direction intersecting a reference position in the X and Y directions, A rotary contact is provided in each of the gripping parts of the upper and lower arms that grip the workpiece from above and below, and when the workpiece is gripped between the rotary contacts provided on the upper and lower arms, the workpiece is at one of the reference positions. The upper and lower rotary contacts are rotatably provided to allow rotation of the workpiece after contact with the workpiece.

(Function) In the above configuration, when the workpiece is gripped and retracted by the rotatable upper and lower rotary contacts provided on the upper and lower arms of the clamp device, the workpiece is tilted with respect to the reference position. and when the workpiece is rotated to align one side of the workpiece with the reference position, the upper and lower rotating contacts can rotate relative to the upper and lower arcs,
This allows the workpiece to rotate with respect to the upper and lower arms of the clamp device, and does not cause strain on the gripping portion of the workpiece.

(Example) An example of the present invention will be described in detail based on FIG.

The pull-in clamp device 21 of the present invention, like the conventional pull-in clamp device 21 described above, is provided so as to be freely retractable from the window 45 provided on the work table 7 of the plate processing machine, and is mounted on the work table 7. Grip the workpiece W and draw the reference lines X ₀ , Y ₀ in the X and Y directions.
The work W is configured to be freely retractable in a direction intersecting the direction (corresponding to the arrow A in FIG. 2).

Note that the same reference numerals are given to the same components as in the conventional structure, and detailed explanations are omitted.

The clamping device 21 includes a fixed lower arm 29
is provided at the tip of the first piston rod 25 (the right end in FIG. 1), and the double-sided oil chamber 51 of the first piston 49,
The first piston 25 is connected to the base 31 by directing working fluid into one of the bases 31 and draining it from the other.
The lower arm 29 and the upper arm 39 are moved forward and backward together.

The second piston 27 described above is similar to the first piston 4
9 and fixes the second piston 55, and the oil chambers 51 provided on both sides of the second piston 55.
By introducing the hydraulic oil into one of the piston rods 57 and 57 and draining it from the other, the upper arm 39 is swung around the pin 59 via the second piston rod 27, and the workpiece W is
grasp.

The fluid pressure cylinder 23 is supported by an elevating shaft 63 at its front cover 61, and the elevating shaft 63 is supported by a bearing 65,
65, it is rotatably provided with respect to the piston 69 of the single-acting lifting/lowering fluid pressure cylinder 67.

The single-acting lifting/lowering hydraulic cylinder 67 is installed almost vertically on the lower frame of the work table 7 via a bracket 71, and by introducing hydraulic oil into the oil chamber 73, the hydraulic cylinder 23 rises, and the hydraulic oil is pumped out. By draining, the weight of the fluid pressure cylinder 23 and the retraction clamp device 21 and the biasing force of the spring 75 are drained. descend.

_The above-mentioned elastic device 47 has an inclination angle of 55 degrees (second
(in the direction of arrow A in the figure).

Note that FIG. 1 shows a state in which hydraulic oil is introduced into the oil chamber 73 of the single-acting lifting/lowering hydraulic cylinder 67 to raise the hydraulic cylinder 23 and the pull-in clamp device 21.
The upper arm 39 protrudes upward from the window 45 of the work table 7 and occupies a position higher than the pass line PL of the work W.

In this state, the vertical leg of the lower arm 29 is connected to the bullet 75 which is crimped inside the first piston rod 25.
The pin 35 is pressed in the tip direction around the pin 33, and the pin 35 implanted above the vertical leg is inserted into the tip of the round hole 37 provided in the base 31 (the right end in FIG. 1). They are in contact with each other, and the lower arm 29 is inclined downward at its tip.

The upper arm 39 and the lower arm 29 of the present invention are provided with a conventional fixed gripper 41 having a sawtooth groove.
Instead, a rotary contact 77 that can rotate freely is provided.

For example, as shown in FIG.
The rotary contact 77 is rotatable and tiltable via a spherical bearing 79, and the lower arm 29 has a cylindrical bearing 81 concentric with the rotary contact 77 of the upper arm 39.
The rotary contact 77 is rotatable via the rotary contact 77.

As described above, the lower arm 29 is urged by the bullet 75 and advances under the workpiece W with its tip downwardly inclined, and when the tip of the lower arm 29 comes into contact with the work table 7 located behind the window 45, The lower arm 29 swings counterclockwise around the pin 33 against the biasing force of the bullet 75, so that the pin 35 contacts the left end of the round hole 37, and the rotary contact 77 contacts the lower surface of the workpiece W. do.

Next, the hydraulic oil is introduced into the oil chamber 51 and the upper arm 39
By closing, the workpiece W can be gripped.

(Effects of the Invention) As can be understood from the above description of the embodiments, the present invention is capable of moving the workpiece W on the worktable 7 freely in and out of the window 45 provided in the worktable 7 of the plate processing machine. A clamping device that can grip and freely pull the workpiece W in a direction intersecting reference positions X ₀ and Y ₀ in the X and Y directions,
Rotary contacts 77 are attached to the gripping portions of the upper and lower arms 39 and 29 that grip the workpiece W from above and below, respectively.
is provided to control the rotation of the workpiece W after the workpiece W comes into contact with the one reference position while the workpiece W is gripped between the rotating contacts 77 provided on the upper and lower arms 39, 29. Upper and lower rotary contacts 77 are rotatably provided to permit the rotation.

As is clear from the above configuration, in the present invention, the rotary contacts 77 are respectively provided at the gripping portions of the upper and lower arms 39, 29 that grip the workpiece W from above and below. And each rotating contactor 7
7 is rotatably provided to allow rotation of the workpiece W after the workpiece W has come into contact with one of the reference positions in the X and Y directions.

Therefore, according to the present invention, when the workpiece W is pulled in, one side of the workpiece W contacts one of the reference positions of X and Y and is in an inclined state, and attempts to rotate to align with the reference position. At this time, rotation around the rotary contact 77 is easy, and the gripping portion by the rotary contact 77 does not suffer from problems such as deformation or scratches as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional elevational view of an embodiment of the present invention;
Fig. 2 is a plan view of a work table of a plate processing machine and a numerically controlled plate moving and positioning device to explain the background of using the device of the present invention, and Fig. 3 is an elevational view of a conventional plate pulling and clamping device. . Explanation of symbols representing main parts of drawings, 21...
Pull-in clamp device, 29...lower arm, 39
... Upper arm, 77 ... Rotating contactor, 79 ...
Spherical bearing, 81...Cylindrical bearing.

Claims (1)

[Scope of utility model registration request] Window section 4 provided on work table 7 of plate processing machine
5, the workpiece W on the work table 7 is grasped and the reference position X ₀ , Y ₀ is set in the X and Y directions.
The clamping device is configured such that the workpiece W can be retracted in a direction intersecting with the upper and lower arms 39. , 29, after the workpiece W has come into contact with the one reference position while the workpiece W is being gripped between the rotary contacts 77 provided on the rotary contacts 77 provided in
A clamp device for pulling a plate material to a reference position, characterized in that upper and lower rotary contacts 77 are rotatably provided to allow rotation of the plate material.