Film transport mechanism for camera

Details Film transport mechanism for camera Film transport mechanism for camera

1995-01-03

1995-11-14

Hayes, Monroe H.

Optics: motion pictures

Removable film strip magazine type

352172, G03B 100

Patent

active

054671590

ABSTRACT:
A film transport mechanism for a camera comprises a film take-up spool rotated to advance a filmstrip from a film cartridge onto the take-up spool, and a perforation sensor for detecting a turn-around perforation in a trailing end portion of the filmstrip to initiate return of the filmstrip from the take-up spool to the film cartridge. The perforation sensor is movable to a sensing position against the filmstrip to be able to drop into the turn-around perforation when the turn-around perforation is advanced to the perforation sensor. A film-on-spool sensor is located against an outermost convolution of the filmstrip as the filmstrip accumulates on the take-up spool, and is moved in response to increased accumulation of the filmstrip on the take-up spool to effect movement of the perforation sensor to its sensing position before the turn-around perforation can be advanced to the perforation sensor.

REFERENCES:
patent: 4274728 (1981-06-01), Waaske
patent: 4437749 (1984-03-01), Ehgartner et al.
patent: 4540261 (1985-09-01), Matsumoto et al.
patent: 4678303 (1987-07-01), Desormeaux
patent: 4721973 (1988-01-01), Harvey

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