| 摘要 |
PURPOSE:To prevent a ready-off trouble when a manual is under rezero operation by providing a means to prevent the execution of the rezero operation for a specified time after a manual switch is set at a wait mode. CONSTITUTION:A monostable vibrator 12 and an OR gate 11 are provided between a rezero switch 13 and a control circuit 10. Namely, when the rezero switch 13 is turned to ON, a signal L is outputted from the OR gate 11, and at the same time, the monostable vibrator 12 operates and outputs the signal L to the OR gate 11 for prescribed time (one shot time). As a result, while the monostable vibrator 12 outputs the signal L, the output of the OR gate 11 is held at the signal L. Accordingly, by setting one shot time to be the sufficient time for the carriage 4 to reach a structural stop position SP, even if the rezero switch 13 is turned to OFF while the carriage 4 moves to an inner circumference direction, it does not shift to the rezero operation, but starts the rezero operation after the expiration of the one shot time. Accordingly, a malfunction when the manual is rezero can be prevented.
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