Optics: motion pictures – Camera and/or projector drive mechanisms – With film engaging claws reciprocally driven to engage film
Patent
1977-03-04
1979-02-13
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
041392850
ABSTRACT:
A film-transport mechanism for perforated strip film in a motion-picture projector comprises a film-transport element having at one end a clause engageable in a perforation of the film and displaceable in a transport direction of the film, and having a cam follower. A cam is rotatable on the projector housing and has a groove whose base surface serves to move the class perpendicular to the film-transport direction into and out of the perforations of this film and whose radially spaced side surfaces constitute respective cam surfaces, one for forward operation of the projector and one for reverse operation. Each of these surfaces has a respective claw-engagement-section, film-transport-section, claw-disengagement-section and claw-return-section in a respective rotational sense of the cam. The film-transport element is biased into engagement with one of the cam surfaces the cam is rotated in one direction and when biased into engagement with the other cam surface it is rotated in the opposite direction. Each of these cam surfaces is so constructed as to advance the film in a most gentle manner in order to minimize film wear whether the film is being driven in the forward or reverse direction.
REFERENCES:
patent: 3504571 (1970-04-01), Kim
patent: 3640441 (1972-02-01), Keznickl
patent: 3675996 (1972-07-01), Wilsch
patent: 3694065 (1972-09-01), Roth
Hayes Monroe H.
Robert & Bosch GmbH
Striker Michael J.
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