| 摘要 |
PURPOSE:To obtain the inexpensive, reliable positioning device of simple constitution by allowing detectors to detect position right before both ends of the range of the angle of rotation of a rotating body, and controlling the output of the driver circuit for a rotating body driving motor according to the states of the detectors. CONSTITUTION:The two detectors 21 and 22, such as microswitches, which detect the cam cylinder 7 being right before both end positions of its range of rotation are provided and the driver circuit whose output is controlled according to the states of the detectors 21 and 22 is connected to input terminals 12a and 12b of the driving motor 12 which drives the cam cylinder 7. The motor 12 rotates forward and backward according to the polarity of a voltage applied to the input terminals of this circuit and the cam cylinder 7 also rotates forward and backward. The detector 21 or 22 changes in state right before the cam cylinder 7 reaches both end positions of the range of the angle of rotation and the driver circuit enters an open state, stopping driving the motor 12. |
