| 摘要 |
PURPOSE:To obtain a multihead welding device which drives plural welding head with one welding electric power source by providing a welding positioning mechanism, plural welding head mechanisms, polishing mechanism of tips of head electrodes, and circuit which successively discriminate and control each part mechanism operation. CONSTITUTION:After a welding position is detected, the presence of parts is judged, and a discrimination on applied pressure to a welding head 2 is made to input a signal for the starting the conducting of electricity to a welding power source 3 according to coincidence conditions. At this time, an upper head 2 is conducted electricity and a lower head 2 is conducted electricity 0.1sec later to input the signal for the starting to the power source 3 again. For electricity conducting switching between the upper and lower heads 2, another signal is inputted from a discrimination control part 18 to a selector control circuit 20 successively. This circuit 20 is arranged between the secondary side of the power source 3 and the primary sides of welding transformers 23 and 24, and performs the electricity conducting switching without reference to a welding current. The control part 18 inputs position information on each mechanism and the welding position, and an information signal such as an applied pressure signal from the head 2 to control a motor driving circuit 21 and a solenoid valve driving circuit 22 according to the coincidence of conditions, performing prescribed operation. |
