| 摘要 |
PURPOSE:To increase a reverse rotating speed and to change a hand position in a short time, by stabilizing a reverse rotation of a step-motor by using the third pulse formed by three alternating pulses, as a divided pulse. CONSTITUTION:When a switch 34 is switched, a reversal use pulse selecting circuit 25 of a pulse forming circuit 23, and a reversal use dividing circuit forming circuit 26 are selected, a reverse pulse formed by three alternating pulses consisting of a signal g1 and a signal h1 by the circuit 25 and a divided pulse g3 by the circuit 26 is applied to a driver 30, etc. through an OR circuit 27, a selecting circuit 29, etc., and a rotor 33 of a step-motor is reversed. Also, even if a clock is placed in a magnetic field by the third divided pulse g2, or supply voltage is varied by a temperature change, the rotor 33 stops stably and no disturbance of the driving system is generated. As a result, reverse driving of a short period is executed stably, a reverse driving speed is increased, and the hand can be corrected in a short time. |
