Camera preventing loading of exposed cartridge

Details Camera preventing loading of exposed cartridge Camera preventing loading of exposed cartridge

1994-12-12

1996-04-23

Blankenship, Howard B.

354288, G03B 1902

Patent

active

055108679

ABSTRACT:
A camera includes a cartridge chamber for holding a film cartridge having a film usage indicator. An ejection member can eject the loaded cartridge from the cartridge chamber by at least a fixed amount. A loading prevention member projects and retracts from the cartridge chamber and when projecting prevents loading of a film cartridge with used film, stopping the film cartridge a first fixed amount from its fully loaded position. The loading prevention member retracts from the cartridge chamber to allow loading when a film cartridge with new film is loaded and returns to the projected position when the loaded cartridge is ejected a fixed amount. In a refinement, an operation completion detection switch cooperates with a cartridge chamber lid switch to help prevent double exposures by preventing feeding of film until the film cartridge has been ejected a second fixed distance from the fully loaded position.

REFERENCES:
patent: 4832275 (1989-05-01), Robertson
patent: 4994828 (1991-02-01), Smart
patent: 4994833 (1991-02-01), Cocca
patent: 5307099 (1994-04-01), Kawamura et al.

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