| 摘要 |
A rotation transmitter ( 44 ) includes a rotor support member ( 440 ) provided on an outer circumference of a spindle ( 2 ), a rotary piece ( 45 ) provided with an engaging portion ( 46 ) that is adapted to be engaged with an engaging groove ( 23 ), and a coil spring ( 48 ) provided between the rotary piece ( 45 ) and the rotor support member ( 440 ). The rotary piece ( 45 ) is supported by the rotor support member ( 440 ) in a manner rotatable in a circumferential direction of a rotation shaft ( 441 ) provided parallel to the axis of the spindle ( 2 ) and the coil spring ( 48 ) biases the engaging portion ( 46 ) onto the engaging groove ( 23 ) via the rotary piece ( 45 ).
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