Motion-picture camera

Details Motion-picture camera Motion-picture camera

1977-04-27

1979-04-24

Hayes, Monroe H.

Optics: motion pictures

Special effects

Transition effects

352 27, 352 72, G03B 2136

Patent

active

041508840

ABSTRACT:
A motion-picture camera optionally loadable with silent-film and sound-film cassettes has a reversible film-feeding mechanism including a reciprocable transport claw and a catch engageable with a takeup reel through a coupling within the cassette including a rewind stop. A spring-loaded stud close to the catch enables the rewind stop to be disengaged in a sound-film camera whereby the film can be transported backward for trick cinematography such as superposition of scenes. During the first run of such a double exposure, a step-down transmission can be activated to slow the windup of the film within its cassette if the latter is of the silent-film type, thereby creating a reserve length of film that can be rewound on the supply reel. In the presence of a sound-film cassette, as determined by a sensor which could be the aforementioned stud, this stepdown transmission is disabled inasmuch as the disengagement of the rewind stop allows the film to be reverse-driven without such reserve length.

REFERENCES:
patent: T920009 (1974-03-01), Kosarko
patent: 3635549 (1972-01-01), Stieringer
patent: 4065209 (1977-12-01), Freudenschuss

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