| 摘要 |
PURPOSE:To prevent disconnection of a clutch using a coil spring having small elastic force by providing a clutch cam wheel with a shifter reversion preventing piece for keeping the shifter immobile to be united in a body. CONSTITUTION:When shifter rollers 23, 24 are brought into contact with the small-diameter portions 5 of clutch cam wheels 3, 4 having a small diameter portion 5 and a large-diameter portion 6 each, shifter reversion preventing pieces 26, 27 mounted on the cam wheels 3, 4 to be united in a body are adapted to hold the rollers 23, 24 so as to keep shifters 7, 8 immobile. Thus, even if large load acts upon the roller 23 brought into contact with the small-diameter portion 5 so that a clutch gear 13 fitted in a clutch shaft 11 is twisted or the force for disconnection acts upon the clutch, the preventing piece 26 is engaged with the roller 23 at the opposite side 25 thereof in such a manner as to hold the roller, so as to prevent the gear 13 from slipping off. |
