JPH11114752A - Clamping device of plate machining unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work clamping device of a plate working unit, whose upper clamp lever retreats into a lower position than a work conveyor line in time of unclamping, and besides, it is compact in size and low-unit cost of production. SOLUTION: This work clamping device 19 is equipped with a clamp base 25 provided with a lower claw member 29, an upper clamp lever 39, a clamp cylinder 33, and an upper clamp lever retreating mechanism situating a top face of the upper clamp lever 39 at a lower position than a work conveyor line in time of unclamping, and in this constitution, this retreating mechanism consists of a link 37 connected to a turning shaft 35 whose one end is installed in a turning shaft 41 of the upper clamp lever 39 and the other end in the clamp base 25 respectively, a cam block 47 installed in a piston rod 45 of a clamp cylinder 33 being contacted and engaged with the link 37 and rotating the link 37, and a tensile spring 55 tensely installed in space between this cam block 47 and a rear arm part 42 of the upper clamp lever 39, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a work clamping device for a plate processing apparatus.

[0002]

2. Description of the Related Art A work clamp device related to the present invention is disclosed in Japanese Patent Application Laid-Open No. 9-85560. FIG. 8 shows a main part of the work clamping device.

The work clamp device 100 includes a lower clamp 101, an upper clamp lever 103 for holding a work in cooperation with the lower clamp 101, a cylinder 105 for driving the upper clamp lever 103, and an upper clamp lever unclamping. It comprises a link mechanism for forming a movement locus for retracting the clamp lever 103 from the clamp position below the pass line.

More specifically, in the above-described work clamp device 100, the upper clamp lever 1 is unclamped at the time of unclamping.
A complicated mechanism including three links L1 to L3 is used as a link mechanism for retracting the 03 from the clamp position. That is, a first link L1 for pivotally supporting the pivot 107 of the upper clamp lever 103 is swingably provided on the clamp base 109, and the first link L1 is pivotally connected to the clamp base 109 by the pivot fulcrum 111. A third link L3, which is swingably provided, is connected via a second link L2.

The third link L3 in the above link mechanism
Is a long link due to the inevitable spatial arrangement between the cylinder 105 and the link mechanism. That is, the holding pin 1 provided on the piston rod 113 of the cylinder 105
15 is provided so as to be freely engageable with the third link L3, and the movement of the piston rod 113 is controlled by the first link L2 via the second link L2.
1, the length of the third link L3 becomes longer, which causes a problem that the whole work clamp device becomes larger and the cost becomes higher.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a compact and retractable upper clamp lever which is retracted to a position below the work transfer line when unclamping. An object of the present invention is to provide a low-cost work clamp device for a plate material processing device.

[0007]

According to a first aspect of the present invention, there is provided a work clamping apparatus for a plate material processing apparatus, comprising: a clamp base having a lower claw member on an upper surface;
An upper clamp lever that clamps a work in cooperation with the lower pawl member, a clamp cylinder that drives the upper clamp lever, and an upper clamp that positions the upper surface of the upper clamp lever at a position lower than the work transfer line when unclamping In a work clamp device provided with a lever retracting mechanism, the retracting mechanism abuts on a link having one end connected to a rotation shaft of the upper clamp lever and the other end connected to a rotation shaft provided on the clamp base. The gist comprises a cam block provided on a piston rod of a clamp cylinder for engaging and rotating the link, and a tension spring provided between the cam block and a rear arm of the upper clamp lever. Things.

Therefore, at the time of unclamping, the upper pawl member of the upper clamp lever is retracted from the position of the lower pawl member, and the upper surface of the upper clamp lever can be moved to a position lower than the work transfer line. Further, the upper clamp lever retracting mechanism can be made compact.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view of a laser processing machine equipped with a pallet device 3 having a work clamping device according to the present invention.

The laser beam machine 1 is a laser machine of a single-axis (X-axis) table moving and single-axis (Y-axis) light moving type, and has a base 5 extending in the X-axis direction. A table 7 that can move and position in the X-axis direction is provided above. In addition, near the center of the table 7 in the longitudinal direction (X-axis direction), a portal frame 9 is provided upright over the table 7, and an upper frame of the portal frame 9 located above the table 7. A laser processing head 13 that can move and position in the Y-axis direction is provided on the left side surface of 11.

A laser oscillator 15 is arranged adjacent to the portal frame 9. A laser beam from this laser oscillator is guided to the laser processing head 13 via a plurality of bend mirrors (not shown), The condensing lens (not shown) provided inside the processing head 13 is configured to condense light.

The pallet device 3 has a rectangular frame 17.
A plurality of work supports (not shown) for supporting the work W are provided inside the frame 17. Further, a plurality of work clamping devices 19 are provided at appropriate ends on the end of the frame 17 on the Y-axis reference (Y = 0) side. The entire pallet device 3 is detachably fixed on the table 7 by a suitable fixing means (not shown).

Therefore, by moving the table 7 in the X-axis direction and simultaneously moving the laser processing head 13 in the Y-axis direction, it is possible to carry out laser processing on the work W placed on the pallet device 3. it can.
Means for carrying the pallet device 3 onto or out of the table 7 and a description thereof will be omitted.

FIGS. 1 and 2 are detailed views of a work clamping device of a plate processing apparatus according to the present invention. FIG. 1 and FIG. 2
The work clamp device 19 will be described with reference to FIG.

The work W is palletized by a plurality of Y-axis references 21 and X-axis references 23 provided on the frame 17.
Is positioned. And work W
Is fixed to the frame 17 on the Y-axis reference 21 side at an appropriate interval in the X-axis direction.

A clamp base 25 of the work clamping device 19 is attached to the upper surface of the frame 17 by bolts 27. One end of the clamp base 25 is provided so as to slightly protrude inside the frame 17, and a lower claw member 29 is provided on an upper surface of the protruding portion. At the other end of the clamp base 25, a bracket 31 extending downward is provided, and the bracket 31 is provided on the side facing the frame 17 with a clamp cylinder 3 comprising a fluid pressure cylinder.
3 is attached by a bolt 34 or the like.

A rotating shaft 35 is provided on the clamp base 25.
A pair of links 37 (a,
b) are provided in parallel and apart from each other, and between the pair of links 37 (a, b), the center of an upper clamp lever 39 that clamps the work W in cooperation with the lower pawl member 29. The portion is rotatably supported by a rotating shaft 41.
On the side of the upper clamp lever 39 facing the lower pawl member 29, an upper pawl member 40 is appropriately attached by a fastening means such as a screw (not shown).

The rotating shaft 35 is mounted in a link mounting hole 43 provided in the clamp base 25. The mounting position of the rotating shaft 35 is located slightly below the upper surface of the clamp base 25. The thickness of (a, b) is such that the link 37 (a,
The upper part of b) is provided so as to coincide with the upper surface of the clamp base 25.

A rectangular cam block 47 engageable with the lower surface of the link 37 (a, b) is attached to the piston rod 45 of the clamp cylinder 33 by a pan-shaped screw member 49. Spring locking pins 51 (a, b) extending in the horizontal direction
Is attached.

On both side surfaces of the rear arm portion 42 opposite to the upper claw member 40 of the upper clamp lever 39 having the rotation shaft 41 as a fulcrum, spring engaging pins 53 (a,
b) is attached. And the spring locking pin 5
1 (a, b) and the spring locking pin 53 (a, b).
A tension spring 55 is stretched between b).

Instead of the tension spring 55, a torsion spring for urging the link 37 and the upper clamp lever 39 in a counterclockwise direction may be provided on each of the rotating shafts.

The operation of the work clamp device having the above configuration will be described with reference to FIGS.

FIG. 4 shows a state in which the upper clamp lever 39 is retracted to a position below the work transfer line. At this time, the piston rod 45 of the clamp cylinder 33
Is in a completely contracted state, and the upper clamp lever 39
The rear arm portion 42 is pulled down by the tension spring 55 so that the upper clamp lever 39 and the link 37 are both in a horizontal state.

FIG. 5 shows a starting state of the clamping operation.
As the piston rod 45 of the clamp cylinder 33 rises, the cam block 47 engages with the lower surface of the link 37 and pushes up the link 37 in the direction of arrow A. At this time, since the rear arm portion 42 of the upper clamp lever 39 and the cam block 47 are connected by the tension spring 55, when the link 37 rises, the upper clamp lever 39
Rotates toward the lower claw member 29 while rising in the direction of arrow B.

FIG. 6 shows a state in which the link 37 is completely vertical. At this time, the link 37 is held and fixed by the wall surface of the link mounting hole 43 and the cam block 47. From this state, the piston rod 45
Rises, the pan-shaped screw member 49 at the tip of the piston rod 45 pushes up the rear arm 42 of the upper clamp lever 39, so that the upper clamp lever 39 rotates clockwise about the shaft 41 as a fulcrum. .

FIG. 7 is a diagram showing a clamped state.
The work (not shown) is clamped between the upper clamp lever 39 and the lower claw member 29.

In the case of unclamping, when the piston rod 45 is contracted in the state of FIG. 7, the upper clamp lever 39 rotates counterclockwise about the rotating shaft 41 as a fulcrum by the tension of the tension spring 55.

As shown in FIG. 5, the piston rod 4
5 is contracted, and the cam block 47 becomes the rotating shaft 3 of the link 37.
When it comes to a position lower than 5, the link 37 rotates counterclockwise about the rotation shaft 35, and the upper clamp lever 39 moves to the rear of the lower claw member 29 accordingly.

When the link 37 returns to the horizontal position and stops, the upper clamp lever 39 is also in the retracted state stored at a position below the work transfer line.

[0030]

According to the first aspect of the present invention, at the time of unclamping, the upper surface of the upper clamp lever is located at a position lower than the work transfer line, and at the same time, the upper pawl member of the upper clamp lever is moved from the position of the lower pawl member. Since the workpiece is retracted, there is no interference between the workpiece and the workpiece clamping device when the workpiece is loaded and unloaded, and there is no restriction on the loading and unloading direction of the workpiece.

Therefore, for example, when a processing line is formed by combining a plate processing machine using the clamp device of the present invention with another machine, there is no restriction on the installation direction of the plate processing machine, and the processing line is not formed. The degree of freedom in
An efficient layout can be achieved.

Further, since the upper clamp lever retracting mechanism can be made compact, the manufacturing cost of the work clamp device can be reduced.

[Brief description of the drawings]

FIG. 1 is a detailed view of a work clamping device of a plate processing apparatus according to the present invention.

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

FIG. 3 is a perspective view of a laser processing machine equipped with a pallet device 3 provided with a work clamping device according to the present invention.

FIG. 4 is an explanatory view of the operation of the work clamp device according to the present invention, showing a clamp retracted state.

FIG. 5 is an explanatory diagram of the operation of the work clamping device according to the present invention, showing a starting state of the clamping operation.

FIG. 6 is an operation explanatory view of the work clamp device according to the present invention, showing a state immediately before the upper clamp lever starts rotating clockwise.

FIG. 7 is an operation explanatory view of the work clamping device according to the present invention, showing a clamped state.

FIG. 8 is a diagram showing a main part of a conventional work clamp device related to the present invention.

[Explanation of symbols]

 17 Frame 19 Work Clamping Device 25 Clamp Base 29 Lower Claw Member 31 Bracket 33 Clamp Cylinder 35, 41 Rotating Axis 37 (a, b) Link 39 Upper Clamp Lever 40 Upper Claw Member 42 Rear Arm 43 Link Mounting Hole 45 Piston Rod 47 Cam block 49 Screw member 51 (a, b), 53 (a, b) Spring locking pin 55 Tension spring

Claims (1)

[Claims] A clamp base having a lower claw member on an upper surface thereof; an upper clamp lever for clamping a work in cooperation with the lower claw member; a clamp cylinder for driving the upper clamp lever; In a work clamp device provided with an upper clamp lever retreat mechanism for positioning an upper surface of an upper clamp lever at a position lower than a work transfer line, the retreat mechanism has one end connected to a rotation shaft of the upper clamp lever and the other end connected to the clamp. A link connected to a rotation shaft provided on a base, a cam block provided on a piston rod of a clamp cylinder that abuts on the link to rotate the link, and a rear arm of the cam block and the upper clamp lever A work clamp device for a plate material processing device, comprising a tension spring stretched between the first and second portions. .