| 摘要 |
PURPOSE:To reduce the weight of extending cable and to save the labor of moving welding worker by reducing drastically the number of cores of the extending cable to connect welding power source part and the vicinity of welding worker. CONSTITUTION:The transistor (TR) 7-3 of the first switching circuit 7 is turned ON, TR 7-2 OFF and TR 7-1 ON in case of the output transmitted from instable multi vibrator circuit 6 being at higher side. A motor 5 is then driven by passing the current to TR 7-1 signal A rectifier element 4 motor 5 for feeding consumable electrode signal B from variable DC power source 6. On the other hand, a welding output opening and closing signal and welding output adjusting signal are not passed by turning ON a TR 10-3 and OFF TR 10-1 in the second switching circuit 10. The current is not passed to the motor 5 by turning on the TR 7-1 conversely for the period of the output of the multi vibrator circuit 8 becoming at lower side, but the TR 10-1 is turn ON and the current is passed to the power source 6 signal B switch 3 for welding output opening and closing variable resister 2 for adjusting welding output rectifier element 1 signal line A.
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