| 摘要 |
PURPOSE:To electronically assure the initial hand setting after releasing the resetting by storing the phase of the driving signal of a step motor at the resetting, and controlling the phase of the first driving signal after the releasing of the resetting depending upon the contents thereof. CONSTITUTION:When a reset signal enters the D type flip-flop of a driving signal phase discriminating and storage circuit 17, the signal B of the signal selecting circuit 16 of that time is held in its output Qp. After releasing the resetting, the circuits are so arranged that the output signal Q16 of the low level of 0.5Hz of a frequency divider circuit emits from the output side A or B opposite from just before the resetting, whereby the outputs OA and OB of a waveform rectifying circuit 13 are used as the driving signal opposite just before the resetting. |
