| 摘要 |
A derailleur for a bicycle has a base member, a movable member movable axially of a multi-stage sprocket assembly, a first feeding mechanism for moving the movable member, and a guide mechanism supported to the movable member and including a guide pulley and tension pulley for guiding the driving chain to one sprocket of the multi-stage sprocket assembly. The guide mechanism has a second feeding means including a controller actuated by operation of the first feeding mechanism to move the driving chain carried by the guide pulley axially of the multi-stage sprocket assembly by use of the movement of the chain. During changing, the chain is forcibly moved by the second feeding means to switch the chain to a desired sprocket.
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