| 摘要 |
PURPOSE:To simplify mechanism for reducing noise, by controlling rotation with thrust load due to reduction gear mechanism of a worm or the like and with frictional force due to a friction plate attached to a shaft end. CONSTITUTION:A friction plate 7 of viscous substance rubber or the like is attached to one end of a shaft 6 of a permanent magnet rotor 5, and a stop plate 8 facing the friction plate 7 is arranged. When the friction plate 7 contacts with the stop plate 8, a frictional force is generated to stop the rotation of the permanent magnet rotor 5. Also, the rotor 5 is provided with a worm 9 of reduction gear mechanism and a worm wheel and thrust load is applied due to the reduction gear mechanism during the rotation of the rotor 7, and the shaft 6 is shifted in the thrust direction. Thus, the rotor can be freely rotated in one direction, and it is prevented from being rotated in other direction by being locked and rotated only in one direction. |
