Optics: motion pictures – Camera and/or projector drive mechanisms – With film engaging claws reciprocally driven to engage film
Patent
1974-11-20
1976-06-15
Hayes, Monroe H.
Optics: motion pictures
Camera and/or projector drive mechanisms
With film engaging claws reciprocally driven to engage film
G03B 122
Patent
active
039633349
ABSTRACT:
A film transport apparatus for a motion picture camera or a motion picture projector comprises a film gate mechanism, a film advancing mechanism for intermittently advancing the film past the exposure or projection aperture, and a takeup reel drive mechanism which permits the takeup reel to wind up the advanced film after it leaves the aperture during the time when the film advancing mechanism is advancing the film and which is arrested to prevent the takeup reel from winding up the film during the time when the intermittently moving film is stopped.
From another aspect of the disclosure, the film gate mechanism comprises an aperture plate provided with first and second film alignment abutments fixedly mounted thereon and arranged on one side of the film path in symmetrically spaced relation to the aperture, and with first and second resilient biased film abutments movably mounted thereon and arranged on the opposite side of the film path in symmetrically spaced relation to the aperture to urge the film against the first and second fixed film abutments respectively. In this film channel construction, the points at which the first and second fixed abutments exert friction against that portion of the film which passes the aperture are out of transversal alignment with those at which the first and second movable abutments exert friction against the film portion, whereby the film in the film gate is stabilized against residual intermittent and irregular motions by such an arrangement of the film abutments with a force larger than the force of the advanced film despite of the fact that vibrations and shocks develop in the region of the takeup reel.
REFERENCES:
patent: 3094055 (1963-06-01), Elsas
patent: 3250586 (1966-05-01), Winkler
patent: 3439980 (1969-04-01), Teshi
Canon Kabushiki Kaisha
Hayes Monroe H.
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