| 摘要 |
<p>PURPOSE:To reduce the impact force by driving a hart type cam by means of a clutched motor so as to move an operating member from the top section to a recessed section of the cam while turning off the clutch immediately before the operating member moves to the bottom of the recessed section. CONSTITUTION:A roller 36 of a member to be operated contacts against a hart type cam face 34. A controller 1 is driven to rotate the cam 34 so as to move the roller 36 from a lower section to a higher section of the cam thus opening a drainage valve 7a of a member to be controlled. Upon arrival to the higher section, a motor stops and upon elapse of predetermined time, the cam 34 is rotated again by means of the motor so as to move the roller 36 from the higher section to the lower section. In the way of said motion, a clutch 15 arranged in a transmission path between the motor and the cam 34 is turned off to reset the roller 34 naturally by means of a spring 38 itself thereby the reset impact is eliminated and impact noise does not occur.</p> |
