Patent ID: 8393594

Claim:
A driving mechanism comprising: a first rotor that rotates around a first shaft and includes a guide that extends in a circular arc around the first shaft and a drive pin that is located outside the guide relative to the first shaft; and a second rotor that rotates around a second shaft that is arranged in parallel with the first shaft and, when the first rotor rotates, the guide passes inside the second shaft and the drive pin passes outside the second shaft, wherein the second rotor includes: a first member that has a plurality of leads which extend from the second shaft in a radial direction, with the drive pin entering one of the plurality of leads when the first rotor rotates; and a second member that is provided between the first rotor and the first member, moves together with the first member, and includes a plurality of first surfaces that have substantially the same curvature as an outer surface of the guide that has circular arc-shape, wherein as the first rotor rotates, one of the plurality of first surfaces comes into contact with and becomes separated from the outer surface of the guide, wherein: the plurality of leads and the plurality of first surfaces are disposed so that each lead is symmetrical with other leads and each first surface is symmetrical with other first surfaces about the second shaft and the plurality of leads and the plurality of first surfaces alternate around the second shaft; when the first rotor rotates and the drive pin enters one of the plurality of leads, contact is released between one of the plurality of first surfaces and the outer surface of the guide, and the second rotor rotates around the second shaft, and when the first rotor rotates and the drive pin moves out of the one of the plurality of leads, a next first surface out of the plurality of first surfaces comes into contact with the outer surface of the guide; and wherein the first member further includes two leads disposed at a pitch of 180° and two stopper pins disposed at positions approximately 90° from the leads, respectively, the stopper pins rotating in the same direction of the guide between the plurality of first surfaces and the first shaft, contacting an inner surface of the guide that has the circular arc-shape, and being disposed so as to pass a part where the guide is not provided when the second rotor rotates.