Spring drive device

摘要

A spring drive device in which a spring holder, a rotor and an output gear are all loosely mounted on a shaft. The spring holder is prevented from rotating and holds one end of a coil spring, the other end of which is held by the output gear. The rotor rotates together with the output gear but is limited in the angle through which it can rotate. The coil spring can be wound and thereafter provide motive power to the output gear.