Automatic film-transport mechanism for a disc camera

Details Automatic film-transport mechanism for a disc camera Automatic film-transport mechanism for a disc camera

1983-09-27

1986-07-29

Gellner, Michael L.

354204, 354207, G03B 100, G03B 1742, G03B 1902

Patent

active

046028595

ABSTRACT:
A completely mechanical disc film camera features film advance and shutter actuation by direct mechanical coupling to an external shutter release button. Shutter button actuation is automatically blocked after the fifteenth frame so as to prevent double exposure and film tearing. Selective film-flattening back pressure is applied to the disc film cassette during the terminal phase of the shutter depression stroke immediately prior to shutter tripping so as to hold the film in the proper imaging plane. Back pressure is released during the film advancing phase to as to relieve system loads and avoid film scratching. The film advance is secured by the oscillatory movement of a film notch engaging pawl carried by a claw driven into oscillatory motion by operation of the shutter button. Means are provided for coupling additional mass to the claw during the terminal phase of the film advancing stroke to reduce the speed of film advance, thereby providing protection against film overtravel. To provide for proper initial film advance when a fresh cassette is inserted an automatic film advancing operation is carried out responsive to closure of the door loading system.

REFERENCES:
patent: 1960998 (1934-05-01), Hindley
patent: 2625087 (1953-01-01), Steineck
patent: 4202614 (1980-05-01), Harvey
patent: 4449806 (1984-05-01), Wong et al.
patent: 4492444 (1985-01-01), Wolcott

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