Spring driven film transport system

Details Spring driven film transport system Spring driven film transport system

1994-03-21

1995-11-07

Gellner, Michael L.

354213, G03B 118

Patent

active

054651298

ABSTRACT:
A film transport mechanism for a camera is powered by a clock-like spiral spring to advance the film. The spring is rewound during manual rewinding of the film into its canister. A separate belt and pulley drive carries the force of spring rewinding. The separate drive also actuates laterally movable (swinging) idler gears on pivot arms to disengage the canister film spool from the drive when the take-up spool is being driven in the forward, film winding, direction and to disengage the take-up spool from the drive when the film spool is being driven in the reverse, film rewind, direction. The film is thus not subjected to the forces required for rewinding the spring. An escapement mechanism is provided to control the speed of film transport to a relatively constant value in spite of the torque variations inherent in the spiral wound spring.

REFERENCES:
patent: 651118 (1900-06-01), Pascal et al.
patent: 1501677 (1924-07-01), McMahon
patent: 2256207 (1941-09-01), Leitz et al.
patent: 3036507 (1962-05-01), Lossev
patent: 3237542 (1966-03-01), Ataka
patent: 4351595 (1982-09-01), Date et al.
patent: 5221940 (1993-06-01), Daitoku et al.

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