Patent ID: 8152388
Filing Date: 2012-04-10
Classification: G03B

Abstract:
1. A power transmission mechanism comprising: a cam-incorporated gear which rotates in one rotational direction by a driving force transmitted from a drive source via a planet gear when engaged with said planet gear, wherein said cam-incorporated gear stops rotating when disengaged from said planet gear; a driven member which includes a follower which contacts at least one surface cam formed on said cam-incorporated gear, said driven member being driven in accordance with the rotation of said cam-incorporated gear in said one rotational direction, and exerting a surplus torque on said cam-incorporated gear in said one rotational direction thereof so as to increase said rotation of said cam-incorporated gear in said one rotational direction, said surplus torque being independent of a torque exerted on said cam-incorporated gear by said drive source; and a damping mechanism which continuously exerts a load torque on said cam-incorporated gear in a rotational direction opposite to said one rotational direction of said cam-incorporated gear so as to cancel out said surplus torque.