From both application limit detect automatically device null

摘要

PURPOSE: To properly judge the critical life of welding tip by providing a sensor to detect the critical life of welding tip in a top end diameter automatic detecting device to automatically detect a top end diameter of welding tip by a sensor. ;CONSTITUTION: The detection of the critical life of welding tips 17, 18, is detected by the fact that whether the beam is intercepted or photodetected while operating photoelectric sensors 13, 14 in upper/lower blocks 9, 10. That is, regarding an upper tip, in the case where it is usable, the beam is intercepted, in excess of the critical life, the beam is photodetected to a photoreceptor 13b because no beam is intercepted due to a small diameter of a tip holder 19. Accordingly, while the beam of the upper photoelectric sensor 13 is intercepted, the tip is usable, further, when it is not intercepted but photodetected, the tip is out of the critical life.;COPYRIGHT: (C)1995,JPO