| 摘要 |
1. A bicycle transmission shifting apparatus comprising: a fixed member (14) ; a take up element (52) rotatably supported on the fixed member (14) for alternately rotating in a transmission element winding direction and in a transmission element unwinding direction, the takeup element (52) being biased in the transmission element unwinding direction; a first control member (26) for engaging the takeup element (52) through a one-way transmission unit (72, 84, 130, 144) for rotating the takeup element (52) in the transmission element winding direction; a position retaining unit (72, 80, 98) coupled to the takeup element (52) and being switchable between a position retaining state for retaining the takeup element (52) in a selected position and a position releasing state for allowing the takeup element (52) to rotate in the transmission element unwinding direction, element unwinding direction; and a second control member (34) for engaging the position retaining unit (72, 80, 98) for switching the position retaining unit (72, 80, 98) between the position retaining state and the position releasing state. The position retaining unit (72, 80, 98) includes only a single position retaining pawl (98) coupled to the takeup element (52). <IMAGE> |
