| 摘要 |
A second clutch gear (21), which serves as a driving gear, receives a driving force from a capstan motor (27). A first clutch gear (19), which serves as a driven gear, is arranged coaxial with the second clutch gear (21), with a friction mechanism (20) interposed therebetween. The first clutch gear (19) receives the driving force which the second clutch gear (21) transmits thereto through the friction mechanism (20). A directly-coupling gear (22) for directly transmitting the driving force from the second clutch gear (21) to the first clutch gear (19) is provided such that it can be brought into mesh with the first and second clutch gears (19, 21). The directly-coupling gear (22) includes first and second gears (22a, 22b) which are arranged coaxial with each other and are designed to provide gaps in the circumferential direction thereof, such the gaps can absorb torsion generated between the first and second clutch gears (19, 21). Engagement-switching means moves the directly-coupling gear (22) between a first position at which the directly-coupling gear is engaged with the first and second clutch gears (19, 21) and a second position at which the directly-coupling gear is disengaged from the first and second clutch gears. |
