JP2001150188A - Clamp device for jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp device for jigs preventing interference with a welding gun even when the welding gun is moved along the peripheral part of a work W1. SOLUTION: A clamp cylinder 71 is arranged on a jig 1 so that the cylinder falls within the plane of projection (the plane of projection of the work) in the vertical direction of the work W1 and the axial line of the cylinder is inclined obliquely upward toward the outside of the plane of projection of the work. A clamp arm 70 is connect to a clamp cylinder 71 so as to be linearly moved in the direction of the axial line of the cylinder and also a pawl part 70b which is bent to the side of the clamp cylinder 71 is formed in the tip part of the clamp arm 70 while allowing an upward rising part 70a to exist therein. When the clamp arm 70 is moved on a closed side where the arm approaches the clamp cylinder 71, the pawl part 70b enters in the plane of projection of the work and brought into contact with the top of the peripheral part of the work W1. When the clamp arm 70 is moved on a opened side where the arm is away from the clamp cylinder 71, the pawl part 70b is made to be detached outside the plane of projection of the work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device provided on a jig used in a work assembling process for performing a welding operation by a welding robot.

[0002]

2. Description of the Related Art A jig used in a process of assembling a work such as a roof of an automobile is provided with a plurality of clamping devices for clamping a peripheral portion of the work set on the jig from above.

Conventionally, this type of clamp device is configured to open and close a clamp arm pivotally attached to a jig by a clamp cylinder. Then, the pivot point of the clamp arm is located outside the peripheral edge of the work, and the clamp arm is brought into contact with the upper surface of the peripheral edge of the work. The work can be set on the jig from above with the clamp arm open.

[0004]

In the above-mentioned conventional clamp device, since the pivot portion of the clamp arm is located outside the peripheral edge of the work, almost the entire clamp device is out of the vertical projection plane of the work. Will be placed on the side. As a result, when welding the peripheral edge of the work with the welding robot, if the welding gun at the tip of the robot is moved along the peripheral edge of the work, the welding gun interferes with the clamp device. Therefore, in the arrangement portion of the clamp device, it is necessary to move the welding gun so as to be largely separated outside the peripheral portion of the work so as to bypass the clamp device, and it takes time for welding work.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a jig clamping apparatus which does not cause interference of a welding gun even when the welding gun is moved along the periphery of a work. .

[0006]

Means for Solving the Problems In order to solve the above problems,
The present invention relates to a clamp device for clamping a peripheral portion of a work set on a jig from above, comprising a clamp arm capable of contacting the upper surface of the peripheral portion of the work, and a clamp cylinder for driving the clamp arm to open and close. A clamp cylinder is disposed on a jig in a vertical projection plane of a work, and a cylinder axis is inclined obliquely upward toward the outside of the projection plane; The clamp arm is connected to the clamp cylinder so as to be linearly moved in the direction, and a claw portion bent toward the clamp cylinder side is formed at the tip end of the clamp arm with an upward rising portion, and the clamp arm approaches the clamp cylinder. When moved to the closing side, the claw portion enters the projection plane and abuts on the upper surface of the peripheral portion of the work, and the clamp arm is moved to the clamp cylinder. Claw portions when moving to the open side of al spaced is to be detached to the outside of the projection plane.

According to the present invention, the clamp arm is linearly opened and closed by the clamp cylinder in the cylinder axis direction. Then, when the clamp arm is opened, the claw portion of the clamp arm separates from the roof projection surface, so that the work can be set on the jig from above without being disturbed by the clamp arm. Also, when the clamp arm is closed, almost the entire clamp device except the tip of the clamp arm fits within the workpiece projection plane, and the gun arm of the welding gun is set to the opening required to prevent interference with the tip of the clamp arm. By keeping the welding gun open, the welding gun can be moved along the periphery of the workpiece without causing interference with the clamping device.

[0008]

1 and 2 show a jig used in a roof assembly process of an automobile. The roof is provided on the lower surface of the roof panel W1 with the front roof rail W on the front edge side.
2, a rear roof rail W3 on the trailing edge side, and three front and rear roof arches W located between the roof rails W2 and W3.
4, W5 and W6 are assembled by welding.

A jig body 1 includes a work receiver 2 for a front roof rail W2, a work receiver 3 for a rear roof rail W3, and work receivers 4, 5, 6 for the respective roof arches W4, W5, W6. When a front clamping device 7 ₁ a pair of left and right clamp the right and left two places of the front edge of the roof panel W1, the rear clamping device a pair of left and right clamp the two left and right places of the rear edge of the roof panel W1 7 ₂ And each side 3 for clamping the left and right side edges of the roof panel W1
Constructed by attaching a number of side clamp device 7 _3.

In the roof assembling step, a front roof rail W2, a rear roof rail W3 and roof arches W4, W5, W6 are set on a jig, a roof panel W1 serving as a work is set from above, and then a roof panel W
1 is clamped by each of the clamping devices 7 ₁ , 7 ₂ , and 7 ₃ , and in this state, a joint between the front edge of the roof panel W1 and the front edge of the front roof rail W2, a rear edge of the roof panel W1 and a rear roof rail. The joint with the rear edge of W3, the side edge of the roof panel W1, and each roof arch W4, W5, W6
Is welded by a welding robot (not shown).

[0011] The front clamping device ₇₁ are set forth in the Figure 3 as a clamp arm 70, clamp arm 70
And a clamp cylinder 71 for driving the opening and closing.
The clamp cylinder 71 is set so as to fit within a vertical projection plane (hereinafter, referred to as a roof projection plane) of the roof panel W1 and to tilt the cylinder axis obliquely upward toward the outside of the roof projection plane. It is fixed to the tool body 1 via a bracket 72 in an inclined posture. The clamp arm 70 is prevented from rotating by a guide block 73 fixed to the bracket 72, and is connected to the clamp cylinder 71 so as to be linearly moved in the cylinder axis direction. At the tip of the clamp arm 70, there is formed a claw 70b that is bent toward the clamp cylinder 71 with an upwardly rising portion 70a. When the clamp arm 70 is moved to the closing side approaching the clamp cylinder 71, the claw 70
b moves into the roof projection plane, contacts the upper surface of the front edge of the roof panel W1, and moves the clamp arm 70 to the open side away from the clamp cylinder 71.
b is separated from the roof projection surface.
Also, a work seat 74 for the front roof rail W2 is mounted on the guide block 73, and the clamp arm 70
Is closed, the joint between the front edge of the roof panel W1 and the front edge of the front roof rail W2 is
The clamp 70 is clamped between the zero claw portion 70b and the work receiving seat 74. A positioning pin 75 for positioning the front roof rail W2 is implanted in the work receiving seat 74. The work guide 74 is further offset laterally with respect to the clamp arm 70 to receive an edge of a front edge of the roof panel W1. 76 is attached.

[0012] The rear clamping device 7 ₂ and the side clamp devices 7 ₃ also front clamping device ₇₁ and the basic configuration is not different, the rear clamping device 7 _2, front clamping device side clamp device 7 ₃ 5 4 7 ₁ illustrates denoted above and the same reference numerals to the same members as the. Incidentally, a work seat 74 provided on the rear clamping device 7 ₂ is intended for the rear roof rail W3, when closing the clamp arm 70, the trailing edge of the roof panel W1 and the rear roof rail W
3 is connected to the claw portion 70 of the clamp arm 70
b and the work seat 74 are clamped. Further, the work seat 74 provided in the side clamp device 7 ₃ undergoing a side edge portion of the roof panel W1, when closing the clamp arm 70, the roof panel W
The first side edge is clamped between the claw portion 70b of the clamp arm 70 and the work receiving seat 74.

[0013] open each clamp device 7 _1, 7 _2, 7 ₃ of the clamp arm 70, the claw portion 70b of the clamp arm 70
Is separated from the roof projection plane, so that the roof panel W
1 can be set on the jig from above without being disturbed by the clamp arm 70.

Each of the clamping devices 7₁, 7_Two, 7_ThreeNo
With the lamp arm 70 closed, the clamp arm 7
Each clamping device 7 excluding the tip of zero₁, 7_Two, 7_ThreeAlmost
The whole fits in the roof projection plane. Therefore, the welding robot
3 to 5 show a gun arm G of the welding gun at the tip of the gun.
Open the welding gun to the front edge and the rear of the roof panel W1.
Even when moving along the edges and side edges, the welding gun
Pump device 7₁, 7_Two, 7 _ThreeDoes not interfere. Scratch
The welding gun can be quickly moved to each
And improve the efficiency of welding work.

[0015]

As is apparent from the above description, the use of the clamping device according to the present invention allows the welding gun to be moved along the peripheral edge of the work without causing interference with the clamping device. Efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a jig provided with a clamp device of the present invention.

FIG. 2 is a side view of the jig viewed from the direction of arrow II in FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 1;

FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 1;

[Explanation of symbols]

W1 Roof panel (work) 7 ₁ , 7 ₂ , 7 ₃ Clamping device 70 Clamp arm 70a Rising portion 70b Claw portion 71
Clamp cylinder

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Teiji Miwa 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. F-term (reference) 4E065 AA05 CA02 CA08

Claims (1)

[Claims] 1. A clamp device for clamping a peripheral portion of a work set on a jig from above, comprising: a clamp arm capable of contacting an upper surface of a peripheral portion of the work; and a clamp cylinder for driving the clamp arm to open and close. A clamp arm which is disposed in a jig within a vertical projection plane of a workpiece and in which a cylinder axis is inclined obliquely upward toward the outside of the projection plane; The clamp arm is connected to the clamp cylinder so that it can be moved directly in the axial direction, and a claw that bends toward the clamp cylinder with an upward rising part at the tip of the clamp arm. When moved to the close side, the claws enter the projection plane and come into contact with the upper surface of the peripheral edge of the work, and the clamp arm is clamped. A claw portion is detached outward from the projection surface when the claw portion is moved to an open side separated from the solder.