| 摘要 |
<P>PROBLEM TO BE SOLVED: To release a first gear from being fixed to a main shaft when the main shaft rotates in the opposite direction from one direction. <P>SOLUTION: A one-way clutch 33 which fixes the first gear to the main shaft when the main shaft rotates in one direction, and releases the first gear from being fixed to the main shaft when the main shaft rotates in the opposite direction from the one direction is provided between a main shaft 18 and a first gear 31. A second gear and a worm wheel 41b are provided integrally with a first rotary shaft 41, and a worm 42a is provided integrally to a second rotary shaft 42 which crosses the first rotary shaft 41 in three dimensions and is capable of moving axially. Rotating speed suppression means 34 suppresses a rotating speed of the second rotary shaft accompanying rotations of the main shaft and first rotary shaft, and a pair of bearing parts 36, 37 hold both ends of the second rotary shaft. When the main shaft rotates in the opposite direction from the one direction and the second rotary shaft is to rotate through the first rotary shaft while the first gear is not released from being fixed to the main shaft by a one-way clutch, rotational resistance imparting means 38 imparts resistance to the secondary rotary shaft in a direction in which its rotation is stopped. <P>COPYRIGHT: (C)2013,JPO&INPIT |
