Patent ID: 7704173

Claim:
A motorized bicycle derailleur assembly comprising: a motor unit including a motor output stroke with a prescribed maximum movement range; a movable part including a chain guide, a derailleur linkage coupled to an output shaft of the motor unit for coupling the motor unit to the chain guide such that the chain guide moves in response to activation of the motor unit, a mechanical adjustment device arranged to change at least one of first and second stroke end positions of a mechanical stroke of the chain guide, and an anti-jamming arrangement having an anti-jamming spring, the anti-jamming spring being configured and arranged to compress when the motor unit continues to apply a moving force to the movable part after the movable part reaches a lockup position corresponding to one of the first and second stroke end positions; and a controller configured to set a maximum motor unit output stroke to an operating movement range that is smaller than the prescribed maximum movement range and at least equal to or less than the mechanical stroke of the chain guide so that the anti-jamming spring remains uncompressed during normal shifting operation.