Electric heating – Metal heating – For bonding with pressure
Patent
1993-02-02
1995-05-02
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 89, 219 911, B23K 1130
Patent
active
054121728
ABSTRACT:
A spot welding machine includes tip electrodes mounted on the tips of the first and second arms, respectively, a pressing actuator for moving at least one of the first and second arms to apply a pressing force to the tip electrodes, an interelectrode distance detector for detecting a distance between the tip electrodes, and a brake for braking the actuator. The distance between the tip electrodes, i.e., interelectrode distance can be set at any desired intermediate distance between the maximum and minimum distances, by braking the actuator when the arms are opened to a desired degree. In this manner, it is made possible to effectively reduce the required operation time, and by suitably performing such a brake control, it is also made possible to effectively lessen an impact caused when the tip electrodes come into contact with plates to be welded. A speed control device may be provided which variably controls the moving speed of the actuator in accordance with the interelectrode distance. In such a case, it is permitted to properly control the moving speed of the arms and hence of the tip electrodes in response to the current position of the arms, and therefore the contact impact can be effectively lessened.
REFERENCES:
patent: 4542277 (1985-09-01), Cecil
patent: 4734555 (1988-03-01), Ferguson
patent: 4970361 (1990-11-01), Fuse
patent: 5115113 (1992-05-01), Miller
patent: 5225647 (1993-07-01), Defrenne
Hirohashi Seiji
Ichikawa Wataru
Matsuki Yuji
Kabushiki Kaisha SG
Shaw Clifford C.
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