Film metering apparatus and method

Details Film metering apparatus and method Film metering apparatus and method

1990-02-28

1991-06-11

Hix, L. T.

354213, G03B 118

Patent

active

050236407

ABSTRACT:
A film metering pawl suitable for use with a motorized film drive has a perforation sensing tooth with a sloping leading edge that allows the tooth to be cammed out of each perforation by the perforation leading edge during prewind/rewind. The pawl also has an integral ramp which cooperates with a fixed pin to be lifted out of each perforation during frame-to-frame film advance beyond registration positions between exposures, without the necessity for mechanical connection to the camera exposure system. An infrared sensor monitors pawl position for motor drive/synchronization purposes.

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