| 摘要 |
PURPOSE:To facilitate control by enhancing stop accuracy when the moving speed fluctuates and also when the operating voltage of drive motor fluctuates considerably. CONSTITUTION:Drive force is transmitted from a motor 27 through a worm wheel reduction gear 13 and a planetary reduction gear 14 to an output shaft 20. Female thread 23 made on the output shaft 20 is engaged with a threaded rod 25 secured to a fixed frame 24 and a clamp plate having a plurality of grooves is applied on the outer periphery of the differential shaft of the planetary reduction gear 14, i.e., a large sun gear 19. A clamp lever to be engaged or disengaged with/from the groove in the clamp plate, respectively, upon motion or stoppage of an electric apparatus is also provided in order to mechanically restrict or release the large sun gear 19 thus moving or stopping the electric apparatus. |
