| 摘要 |
PURPOSE:To limit the rotation of an output shaft in one direction readily and inexpensively by providing a clutch structure in a reduction gear train. CONSTITUTION:Toothed irregular part 18 is formed on the end face of a boss which is extended to a driven gear 9. A clutch 19 which is opposed in contact with the part 18 is arranged in a bearing 13, and normally engaged with the part 18 by the energizing force of a compression spring 20. The clutch 19 is movably engaged with a shaft 11, immovably engaged with the bearing 13 and arranged only axially movably. The part 18 urges the spring 20 to the rotation of one direction of the intermediate gear 9 to rate while removing the clutch 19 downwardly, and is prevented from rotating by the clutch 19 to the rotation of the reverse direction. |
