Resistance spot welding gun and transformer assembly
First Claim
Patent Images
1. A resistance welding apparatus for forming a weld on a work piece, said apparatus comprising:
- a transformer having a pair of output terminals;
a cylinder and piston assembly shiftable axially relative to one another along a cylinder axis and including a piston rod attached to the piston and extending axially from at least one end of the cylinder and piston assembly;
a pair of electrodes, one of the electrodes being connected to the cylinder and the other electrode being connected to the piston rod;
flexible connector means for electrically connecting said electrodes to the transformer output terminals; and
bracket means for slidably attaching the cylinder and piston assembly to the transformer to allow limited movement therebetween along an axis substantially parallel to the cylinder axis and enabling the electrodes to maintain a self-equalizing pressure on the work piece.
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Accused Products
Abstract
An assembly is provided for mounting on an end of a robot arm actuator as an integral spot resistance welding gun and transformer unit. A gun slide support bracket is connected to the transformer and serves to provide a mount for a sliding gun cylinder having a piston connected to one of the jaw electrodes. The lower jaw is removably connected to the cylinder. Roller shunts are used to provide electrical connection between secondary terminals on the transformer and the two electrodes. A proximity switch assembly is advantageously utilized to provide signals to the robot controller indicating a fully retracted position of the jaws.
43 Citations
19 Claims
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1. A resistance welding apparatus for forming a weld on a work piece, said apparatus comprising:
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a transformer having a pair of output terminals; a cylinder and piston assembly shiftable axially relative to one another along a cylinder axis and including a piston rod attached to the piston and extending axially from at least one end of the cylinder and piston assembly; a pair of electrodes, one of the electrodes being connected to the cylinder and the other electrode being connected to the piston rod; flexible connector means for electrically connecting said electrodes to the transformer output terminals; and bracket means for slidably attaching the cylinder and piston assembly to the transformer to allow limited movement therebetween along an axis substantially parallel to the cylinder axis and enabling the electrodes to maintain a self-equalizing pressure on the work piece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A resisting welding apparatus adapted to be mounted on a robot arm actuator to form spot welds on a work piece, said apparatus comprising:
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a frame; a transformer attached to said frame and having a pair of output terminals; a cylinder and piston assembly shiftable axially relative to one another along a cylinder axis and including a piston rod attached to the piston and extending axially from at least one end of the cylinder and piston assembly; a pair of electrodes, one of the electrodes being connected to the cylinder and the other electrode being connected to the piston rod;
flexible connector means for electrically connecting said electrodes to the transformer output terminals; andguide means for slidably attaching the cylinder and piston assembly to the frame to permit limited movement therebetween along an axis substantially parallel to the cylinder axis allowing a pair of electrodes to self-position about the work piece during welding. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification