| 摘要 |
PURPOSE:To detect the lower limit position of a work with simple constitution by comparing an output of a position detector when a work detector outputs a detecting signal with a preset lower limit value. CONSTITUTION:The movement of a working machine is started by inputting a position command so as to conduct the work such as welding. The movement amount is detected by a position detector 1, added (2) with said position command generating section 3 and a drive section 4. The detected moving amount is compared with each value of upper limit/lower limit value setting devices 6, 7 at comparators 8, 9. In the comparator 9 of the lower limit value, it is conducted in the timing when an output signal is outputted from the detector 5 of the work end position to the work. As a result, when the output is deviated from the upper limit and lower limit value, an alarm signal is outputted so as to activate alarm sections 10, 11 and when the detector is operated, the working machine is stopped. |
