Patent Number: 6,252,193

Title: X type electric welding machine

Abstract: An X type electric welding machine with an electrode pressing force that is not susceptible to the wear of electrodes or variation of deflection of gun arms which varies every pressing force. An accurate electrode pressing force can be obtained for an electrode pressing force set by a simple controller. The X type electric welding machine includes at least two gun arms each having electrodes at tip ends thereof which oppose each other. The gun arms are connected to each other at a connection part on which at least one gun arm is rotatably pivoted. A reduction gear is disposed separately from the connection part of the gun arms and a motor is connected to the reduction gear. A power transmission mechanism is provided at an output side of the reduction gear for rotating one of the gun arms, wherein the power transmission mechanism includes a swing arm fixed to an output shaft of the reduction gear and a link formed between the swing arm and one of the gun arms. The swing arm and the link are connected to each other so that an output from a shaft of the motor and an electrode pressing force applied by one of the electrodes that is transmitted to the one of the electrodes from a tip end of the swing arm by way of the link, have a substantially linear proportional relation.

Inventors: Umeda; Shigeru (Ayase, JP)

Assignee: Obara Corporation

International Classification: B23K 11/31 (20060101); B23K 11/30 (20060101); B23K 011/11 ()

Expiration Date: 06/26/2018