| 摘要 |
PROBLEM TO BE SOLVED: To improve joining quality by constantly obtaining a set pressurizing force for joining, efficiently, stably and surely in a simple structure. SOLUTION: After an upper electrode 38 comes into contact with a workpiece surface, an air cylinder 44 continues a responding motion. As a result, a head body 18 further descends against a catch coil spring 46, with a pressure coil spring 20 compressed an deformed by receiving a pressure from the air cylinder 44 through a spring holding bolt 24. Then, with the displacement quantity of the pressure coil spring 20 reaching a prescribed value, a microswitch 48 turns on, generating an on-signal or a timing signal MS. At this point, a control circuit 50 turns on both stop valves 58, 60, switching to a state of closing. COPYRIGHT: (C)2003,JPO
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