Long distance film advance mechanism

Details Long distance film advance mechanism Long distance film advance mechanism

G - Physics

03

B

95/8.6

G03B 1/18 (2006.01) G03B 17/50 (2006.01) G03B 17/52 (2006.01)

Patent

CA 1087895

ABSTRACT Photographic apparatus has a film advance mechanism that advances the foremost film unit from within a cassette of stacked units by a major distance far longer than an access slot conventionally provided on the cassette for a short, index- like film advance. In a self-developing camera, the long advance can move an exposed film unit from the image surface to remotely-located spread rollers that initiate film processing. The advance mechanism engages the film unit in a manner that avoids conventional structural limitations on the length of the advancing travel. One embodiment introduces a pick arm, which drivingly engages a back edge of the film unit, into the film cassette under a marginal flange; the arm is free to travel inside the cassette along a major portion of the cassette length. Another embodiment successively indexes the film unit forward through the conventional access slot of the cassette and engages an accessable frontal margin of the unit to pull it further along the path of advance.

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