| 摘要 |
A clutch cam (9) with mating claws (17) is fitted into the bottom end of a driven pulley (6) through which a driven shaft (10) is inserted. The clutch cam (9) has upwardly tapered guide portions (18) and slide grooves (20) formed on the inner wall thereof. A cam sleeve (12) is fitted over an upper portion of the driven shaft (10) and rotated integrally with the driven shaft (10) due to a key (11). Clutch claws (16) are formed at the lower end of the cam sleeve (12). The key (11) has a tapered bottom end (11a). When the driven shaft (10) is lowered to the clutch cam (9), the tapered bottom end (11a) is brought into contact with one of the guide portions (18) into one of the slide grooves (20), placing the clutch claws (16) in a proper position relative to the mating claws (17) for smooth clutch engagement.
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