JPH0248149Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a resistance welding gun device used for welding automobile bodies.

(Prior art) The applicant of this application previously applied for this type of device in 1982.
According to No. 123003, as shown in Figs. 1 and 2, a gun body d which is elongated in the direction in which the support leg b is erected is attached to the tip of a support arm c extending laterally from the support leg b on the machine stand a. is swingably supported via a support shaft provided at a longitudinally intermediate portion of the gun body d so that its tip and tail end move laterally in opposite directions. At the tip of d, support leg b of the tip
A fixed gun arm e is fixed to a nearby portion, and a movable gun arm f is supported by a cam groove l formed in the gun body d so as to be openable and closable in the lateral direction with respect to the fixed gun arm e. It is connected via a link mechanism i to a piston rod h extending from a cylinder g provided at the tail end of the gun body d for opening/closing operation, and furthermore, the support leg b is opposite to a stepped portion j formed on the piston rod h. If the piston rod h is moved forward from the state shown in FIG. 1, the movable gun arm f will first be opened, and then the gun will open due to the reaction force caused by the contact of the stepped portion j with the stopper arm k. We have proposed a device in which the main body d is allowed to swing in the lateral direction so as to prepare for insertion of the workpiece W as shown in FIG.

(Problem to be solved by the invention) In the above case, the direction in which the gun body d swings and the direction in which the step j contacts the stopper arm k are perpendicular to each other, and the step j moves along with the swing of the gun body d. When moving in the lateral direction relative to the stopper arm k, the movement is obstructed by the prying of both j and k, and the rocking of the gun body d tends to lack smoothness, and an unbalanced load is applied to the piston rod h via the step j. It comes with the inconvenience of

Also, since there are cases where the workpiece W, jigs, etc. are exposed to the outside of both gun arms e, f, the opening degrees of both gun arms e, f should be freely adjustable to avoid interference with these jigs, etc. In this case, the opening degree can be adjusted by changing the height of the stopper arm k, but in order to be able to adjust the movement of the stopper arm k with respect to the support leg c while ensuring its rigidity, a special guide is required. As more parts are required, the device becomes larger.

An object of the present invention is to provide a device that eliminates the above-mentioned disadvantages.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a support arm that extends horizontally from a support leg on a machine base.
The gun body, which is elongated in the direction in which the support leg is erected, is swung via a support shaft provided at the longitudinally intermediate portion of the gun body so that its tip and tail end move laterally in opposite directions. A fixed gun arm that is movably supported and fixed to the distal end of the gun body at a portion of the distal end near the supporting leg, and a cam groove formed in the gun body that can be opened and closed laterally with respect to the fixed gun arm. a movable gun arm supported by the gun body; a cylinder is attached to the tail end of the gun body so that the axis of the piston rod runs along the longitudinal direction of the gun body; A link mechanism is installed to convert longitudinal movement into lateral movement and transmit it to the movable gun arm, and the movable gun arm is opened and closed by the reciprocating movement of the piston rod via the link mechanism. The link mechanism is configured such that when the movable gun arm is opened, a portion of the link constituting the link mechanism is swung laterally toward the support leg, and the link mechanism is in contact with the portion of the link on the support leg. It consists of a horizontally installed stopper bolt that restricts its swinging.

(Example) The present invention will be explained with reference to an example shown in FIG. 3 and below. In the drawing, 1 indicates a machine base, and 2 indicates a support leg installed on the machine base 1. A support arm 3 extending laterally is provided on the top of the support leg 2, and a support arm 3 is provided at the tip of the support arm 3. A long gun body 4 is swingably supported in the direction in which the support leg 2 is erected so that its tip and tail end move laterally in opposite directions. Fixed gun arm 5 on one side (left side in the drawing)
and the movable gun arm 6 on the other side are arranged in parallel. To explain this in more detail, the gun body 4
is a pair of front and back plates 4 as shown in FIGS. 4 and 5.
a, 4a, and the supporting arm 3 is connected to the both plates 4.
The gun body 4 is inserted between the two plates 4a and 4a, and the gun body 4 is pivotally supported by the longitudinally intermediate support shaft 7 of the gun body 4, which is installed horizontally between the two plates 4a, 4a. The left side of the tip extends into the space in front of the supporting leg 2, and the fixed gun arm 5 is fixed at its root between the plates 4a, 4a of this extended portion by a pair of bolts 5a, 5a, and the gun body 4
Insert the root of the movable gun arm 6 between the two plates 4a, 4a on the right side of the tip, and insert the root into the cam groove 8 formed in each plate 4a with a pair of pins 6a, 6a installed horizontally. engaging the movable gun arm 6 with the fixed gun arm 5 through the cam groove 8.
A cylinder 9 is supported so as to be openable and closable, and the movable gun arm 6 is provided at the tail end of the gun body 4.
Link mechanism 11 to piston rod 10 extending from
As the rod 10 moves forward and backward, the movable gun arm 6 can be opened and closed in the lateral direction relative to the fixed gun arm 5.

The link mechanism 11 is composed of a first link 12 on the piston rod 10 side and a second link 13 on the movable gun arm 6 side. Accordingly, when the movable gun arm 6 is opened, it is swung laterally toward the support leg 2,
More specifically, the first link 12 has an L-shaped lever that engages the piston rod 10 at its tail end bend, and the second link 13 has the root of the movable gun arm 6 at its distal end. and a lever that engages with the pin 6a of the piston rod 10, so that the tip end of the first link 12 and the tail end of the second link 13 are engaged with each other, so that when the piston rod 10 moves forward, The first link 12 is connected to the intermediate shaft 1
4 in the counterclockwise direction in the drawing, and its tip moves laterally to the left toward the support leg 2 side, and as a result, the second link 13 is also used as the support shaft 7. The movable gun arm 6 is oscillated clockwise about the intermediate shaft, and its tip portion moves laterally to the right, thereby giving the movable gun arm 6 an opening motion to the right along the cam groove 8.

A stopper bolt 15 is installed horizontally on the support leg 2 to abut against the tip of the first link 12 to restrict its swinging, and further, in the illustrated example, the above-described gun body 4 is attached to the top of the support leg 2. A second stopper bolt 16 is provided to abut on the left extension of the tip and restrict the swinging of the gun body 4.

In the drawing, 17 is a power supply cable, 18 is a power supply plate connected to the fixed gun arm 5, 19 is an ounce copper plate for power supply connected to the movable gun arm 6, 20 is a cover attached to the outer surface of each plate 4a, and 21 is an insulating material.

Next, the operation of the present invention will be explained based on the above embodiment. When the piston rod 10 is advanced from the state shown in the third figure, the movable gun arm 6 moves to the right with respect to the fixed gun arm 5 via the link mechanism 11 as described above. At the same time, the first
When the movable gun arm 6 is opened to a predetermined opening degree by swinging the link 12 toward the support leg 2, the tip of the first link 12 comes into contact with a stopper bolt 15 installed horizontally on the support leg 2, as shown in the seventh figure. , gun body 4
is then swung counterclockwise around the support shaft 7 by the lateral reaction force acting on this abutting portion, and at a predetermined swiveling position, the extending portion on one side of the tip of the gun body 4 is the second stopper bolt 16 on the support leg 2.
The gun arms 5 and 6 are opened to the left and right with respect to the workpiece W insertion position.

Here, the opening degree of the fixed gun arm 5 with respect to the workpiece insertion position corresponds to the swing angle of the gun body 4, and thus each stopper bolt 15, 16
By adjusting the position of each gun arm 5, 6, the position of each gun arm 5, 6 can be freely and variably adjusted.

Further, the gun body 4 moves to the right with respect to the stopper bolt 15 by swinging due to the contact of the first link 12 with the stopper bolt 15, and the first link 12 that contacts the stopper bolt 15 from the left side moves away from the stopper bolt 15. The prying of the piston rod 10 is suppressed as much as possible, and no unbalanced load is applied to the piston rod 10.

(Effect of the invention) As described above, according to the present invention, when the movable gun arm opens, the part of the link that moves laterally toward the supporting leg comes into contact with the stopper bolt installed horizontally on the supporting leg. The gun body is smoothly swung in the lateral direction by the lateral reaction force acting on the abutment part, and no unbalanced load is applied to the piston rod, and the opening of the fixed gun arm and movable gun arm can be adjusted. This can be easily achieved by screwing the stopper bolt back and forth, and has the effect of making the device smaller and cheaper than the conventional one which requires a stopper movement guide member.

[Brief explanation of drawings]

Fig. 1 is a cut-away front view of the conventional device, Fig. 2 is a cut-away front view of the device in its operating state, Fig. 3 is a cut-away front view of an example of the proposed device, Fig. 4 is its left side view, Figs. 6 is a side view taken along the line - and -, respectively, in FIG. 3, and FIGS. 7 and 8 are front views cut away, respectively, for explaining the operation thereof. 1... Machine stand, 2... Support leg, 3... Support arm,
4...Gun body, 5...Fixed gun arm, 6...
Movable gun arm, 7... Support shaft, 8... Cam groove, 9
...Cylinder, 10...Piston rod, 11...
... Link mechanism, 12 ... First link (link that contacts the stopper bolt), 15 ... Stopper bolt.

Claims (1)

[Scope of utility model registration request] A gun body, which is elongated in the direction in which the support arm is erected, is attached to the tip of a support arm extending laterally from a support leg on the machine base, so that its tip and tail end move laterally in opposite directions. a fixed gun arm that is swingably supported via a support shaft provided at a longitudinally intermediate portion of the gun body and fixed to a distal end of the gun body and to a portion of the distal end near the support leg; a movable gun arm supported by a cam groove formed in the gun body so as to be openable and closable laterally with respect to the fixed gun arm;
A cylinder is attached to the tail end of the gun body so that the axis of the piston rod runs along the longitudinal direction of the gun body, and a cylinder is attached to the gun body so that the longitudinal movement of the piston rod is converted into lateral movement. A link mechanism that converts the piston rod and transmits the information to the movable gun arm is attached, and the movable gun arm is opened and closed by the reciprocating movement of the piston rod via the link mechanism. A part of the link constituting the link mechanism is configured to swing laterally toward the support leg, and a stopper bolt is horizontally installed on the support leg to abut the part of the link and restrict the swing. Resistance welding gun equipment consisting of.