1983-09-22
1985-04-02
Gonzales, John
G03B 1736
Patent
active
045084416
ABSTRACT:
A camera having a film counter for indicating the number of unexposed film units remaining in the camera. The film counter includes a rotatably mounted drum having a single row of teeth by which the drum may be sequentially indexed in a first direction subsequent to the exposure of a film unit. A pawl having first and second working surfaces limits rotation of the drum in a second direction thereby maintaining the drum in its newly indexed position. By removing one of the teeth, the second working surface is able to move into the space created by the removed tooth and into the path of movement of one of the teeth during rotation of the drum in the second direction to thus stop the drum in its newly indexed position. Thus, the second working surface obviates the need for a second pawl and/or a second row of teeth while removal of the tooth from the row prevents the drum from being further indexed in the first direction when the supply of film has been exhausted, thus preventing overwinding of its return spring.
REFERENCES:
patent: 3653313 (1972-04-01), Leduc
patent: 3984852 (1976-10-01), Johnson et al.
patent: 4041510 (1977-08-01), Kern
patent: 4075647 (1978-02-01), Johnson
patent: 4212524 (1980-07-01), Douglas
Corrigan Alfred E.
Gonzales John
Polaroid Corporation
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