| 摘要 |
A coupling member ( 18 ) is of a forked leaf spring which is substantially U-shaped and has a pair of sidepiece portions ( 18 a , 18 a), a pair of bent portions ( 18 b , 18 b), a pair of joining portions ( 18 d , 18 d) and a curved portion ( 18 e). The sidepiece portions ( 18 a , 18 a) are disposed parallel to each other. The bent portions ( 18 b , 18 b) are configured to extend from the sidepiece portions ( 18 a , 18 a) and have sandwich portions ( 18 c , 18 c) releasably supporting a first pin ( 14 ) mounted on a pulley, respectively. Each sandwich portion ( 18 c) has an inside surface ( 19 a) which is opposed to the outside circumferential surface of the first pin ( 14 ) at a regular distance, and a first and second projections ( 19 b , 19 c) which are provided at both ends of the inside surface ( 19 a) and contacted with the outside circumferential surface of the first pin ( 14 ). |
