Warning indicator for a camera

Details Warning indicator for a camera Warning indicator for a camera

1984-07-11

1987-04-07

Perkey, William B.

3542891, G03B 100, G03B 1720

Patent

active

RE0323918

ABSTRACT:
A camera having a recess for receiving a roll of film and a take-up mechanism for advancing the film, the film having registration holes along the edges thereof, is provided with a sprocketed wheel for engagement with the registration holes, the wheel advancing when the film is advanced by the take-up mechanism. The wheel is coupled to a mechanical flag, in one embodiment, and to an electronic indicator, in another embodiment, to warn the operator of the camera when the film is not advancing properly.

REFERENCES:
patent: 1321868 (1919-11-01), Weiss
patent: 1828630 (1931-10-01), Underwood
patent: 2289800 (1942-07-01), Nagel
patent: 2530510 (1950-11-01), Crumrine
patent: 2750858 (1956-06-01), Marvin et al.
patent: 3688668 (1972-09-01), Ort
patent: 4021828 (1977-05-01), Iura et al.
patent: 4174888 (1979-11-01), Hunn et al.

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