Planetary gear mechanism

摘要

A gear mechanism includes a pair of drive transmission gears laterally movably disposed between a base plate and a housing provided on the base plate, and a control structure for restricting the lateral movement of the drive transmission gears. Turning force from a single driving gear is transmitted to the drive transmission gears, movements of which are controlled by the control structure. In the different embodiments, the controlled turning forces of the drive transmission gears can be transmitted to either or both of the driven gears.