Translationally movable idler gear as clutch for spring driven motor

A clutch mechanism adapted for use in a spring driven motor including a spring, a drive gear operated by the spring,

• a power output and a gear train situated between the drive gear and the power output for changing rotational rate of the drive gear, the clutch mechanism comprising
• an idler gear interposed between two adjacent gears selected from the drive gear, the gear train and an output gear of the power output, and stationary supporting means for supporting said idler gear and permitting the idler gear to rotate and to move translationally relative to the supporting means such that the idler gear can move translationally between a position in which the idler gear is in simultaneous driven engagement with said two adjacent gears and a position in which the idler gear is out of said simultaneous driven engagement,
• wherein the idler gear has an axial opening extending therethrough and the supporting means comprises a post extending into said opening and being sufficiently smaller in cross section than said opening to permit said rotation and said translational movement.