BALANCER MECHANISM FOR ROTATING SHAFT

摘要

A balancer mechanism (8) for a rotating shaft capable of easily and surely reducing a torque acting on the rotating shaft by allowing a balancing torque offsetting at least a part of the torque acting on the rotating shaft to act on the rotating shaft by using a gas spring, comprising a cam member (10) fixed to the left end part of the rotating shaft (3), a cam follow-up member (15) following up the cam member (10) in contact therewith, and the gas spring (20) elastically energizing the cam follow-up member (15) toward the cam member (10) and allowing the balancing torque offsetting at least the part of the torque to act on the rotating shaft (3) through the cam follow-up member (15) and the cam member (10).