Metering defeat mechanism

Details Metering defeat mechanism Metering defeat mechanism

1989-05-09

1990-04-03

Hix, L. T.

G03B 100

Patent

active

049144626

ABSTRACT:
A photographic camera is disclosed for use with a film cassette in which a filmstrip has a row of metering perforations in its imaging portion, adjacent a longitudinal film edge, for engagement with a metering pawl of the camera, and a row of take-up perforations in its leader portion, adjacent the same film edge, for engagement with a take-up spool of the camera, and a film spool is rotatable to unwind the film strip off the spool to thrust the leader portion from the cassette. The camera includes a film sensing member for normally maintaining the metering pawl removed from a film advance path between the cassette and the take-up spool to prevent the pawl from erroneously engaging the leader portion at one of its take-up perforations. The sensing member is actuated to release the metering pawl, to allow the pawl to be moved into the film advance path to engage the imaging portion at one of its metering perforations, only after the leader portion has been advanced sufficiently from the cassette to move its take-up perforations out of reach of the pawl.

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