Takeup spool drive with clutch mechanism and method of operation

Details Takeup spool drive with clutch mechanism and method of operation Takeup spool drive with clutch mechanism and method of operation

1994-02-23

1995-03-14

Blankenship, Howard B.

354212, G03B 118

Patent

active

053980891

ABSTRACT:
A takeup spool drive for motorized camera film winding mechanisms and the like has a clutch mechanism with simplified components including a driver, a driven member such as a pinion gear and a takeup spool. The driver has lugs that drive the pinion gear in both directions with lash. Fingers on flexing arms of the driver engage internal teeth of the takeup spool to drive it in a forward film takeup direction. The fingers are disengaged by lash takeup in the reverse direction that causes inward flexing of the arms and allows free running of the spool. In addition to selective engaging and declutching drive of the takeup spool, the mechanism fingers re-engage the internal teeth upon momentary forward rotation for lash takeup and thereby lock the free running takeup spool when the motor is stationary after a winding movement, such as when the film registers in a film gate.

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