| 摘要 |
PURPOSE:To eliminate backlash by arranging two planetary gears in shiftable ways between a housing and a base board. CONSTITUTION:Driven gears 12 and 13 are rotatably installed onto a base board 14 on the both sides of planetary gears 10 and 11. A guide rib 16 guides the planetary gears 10 and 11 in the direction of the driven gears 12 and 13, and a light tension is applied in the direction of a motive gear 18 onto the tooth surface of the planetary gear 11 by a bias spring 21. When the motive gear 18 is revolved counterclockwise, the driven gears 12 and 13 revolve counterclockwise. if the planteary gear 11 is pressed by a lever 20 and shifted, the revolution of the driven gear 12 can be suspended. |
