Film advance and metering mechanism for cameras

Details Film advance and metering mechanism for cameras Film advance and metering mechanism for cameras

1974-08-30

1976-07-06

Peters, Jr., Joseph F.

G03B 116

Patent

active

039685098

ABSTRACT:
A still camera for use with roll film having a row of perforations, one for each film frame, wherein the film is transported lengthwise by a mechanism including a planetary transmission and the transport of film is terminated in response to disengagement of a pivotable control lever from the teeth of a gear forming part of the film transporting mechanism. The control lever is disengaged from the gear by a spring-biased displacing lever which is normally held against pivotal movement into engagement with the control lever by a blocking lever. The latter can be disengaged from the displacing lever by a feeler which bears against the film and penetrates into an oncoming perforation to disengage the blocking lever from the displacing lever in response to further transport of the film. The displacing lever then pivots the control lever and bears against the feeler while the film is at a standstill. The feeler is retracted from the perforation after the displacing lever is disengaged from the control lever during opening of the shutter whereby the blocking lever is free to return into a position in which it prevents the displacing lever from disengaging the control lever from the gear. The blocking lever then also prevents the displacing lever from bearing against the feeler.

REFERENCES:
patent: 3603236 (1971-09-01), Engelsmann
patent: 3712200 (1973-01-01), Beach
patent: 3747494 (1973-07-01), Peters
patent: 3750545 (1973-08-01), Beach
patent: 3757658 (1973-09-01), Stoneham
patent: 3774513 (1973-11-01), Ettischer
patent: 3776114 (1973-12-01), Edwards

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