| 摘要 |
<p>PURPOSE:To drive selectively any of at least three output shafts. CONSTITUTION:In selecting the change-over of an output shaft 18, current supply to an electromagnetic solenoid 21 is shut off, a friction plate 9 is pressed against a base plate by a spring 24 and an electric motor 3 is driven. Thus, the driving force of the motor 3 is transmitted to a support pillar 6 to rotate the support pillar 6 and an arm 10 integral therewith. When the arm 10 reaches the position of the output shaft 18 to be desirably changed aver, the drive of the motor 3 is stopped and current is supplied to the electromagnetic solenoid 21. Thus, while the friction plate 9 is attracted to a stator core 22, a pulley 13 of the arm 10 is coupled with the output shaft 18. Thus, by supplying current to the motor 3 under such a condition, the driving force of the motor 3 is transmitted through a shaft 4, pulley 15, belt 17 and the pulley 13 to the output shaft 18.</p> |
