| 摘要 |
PURPOSE:To obtain a high torque only during a predetermined interval at the time of starting by providing a pinion formed integrally with a rotor of a motor, a gear train, an output gear, an output shaft a switching detecting mechanism, and control means for driving the motor, and devising a control means for a drive source. CONSTITUTION:A pinion 3 is integrally provided with a rotary shaft 2 integral with the rotor of a stepping motor 1, a large-diameter gear 4 is engaged with the pinion 3, a large-diameter gear 6 is engaged with a small-diameter gear 5 integral with the gear 4, and large-diameter gear 8 is engaged with a small- diameter gear 7 integral with the gear 6. The gear 8 constitutes an output gear. A protruding shaft of an output shaft 21 is engaged from a lower end side with the central hole of a tube shaft 9. Then, the gear 8 in a rotation transmission passage from the pinion 3 to the shaft 21 constitutes one rotary member. Thereafter, a switching detecting mechanism 55 for detecting the rotary position of the gear 8 as a rotary member to detect the switching state of an opening/closing element is composed. The motor 1 is started, stopped and its output torque is switched based on the detection signal. |
