Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent
1977-02-18
1978-04-18
Adams, Russell E.
Optics: motion pictures
With sound accompaniment
Common picture and sound record carrier systems
352180, 352194, 352195, G03B 3102, G03B 2148
Patent
active
040848922
ABSTRACT:
A control for varying the speed of advancement of film is described for use in a film projector in which the film is advanced by a shuttle tooth which engages perforations in the film and advances the film along a path between a light source and a projector aperture. The control includes a rotary shutter assembly having one or more shutter blades for interrupting the light from the light source. As the shutter assembly rotates, the shuttle tooth is reciprocated in the direction of film feed by a rotary cam having one or more cam lobes mechanically coupled to the shuttle tooth. The rotation of the cam lobes is synchronized to the rotation of the shutter blades such that the shuttle tooth is positioned for engagement with the perforations associated with the next successive film frame to be projected whenever a shutter blade interrupts the light source. To engage the shuttle tooth with the film perforations, means are included for sensing the interruption of the light source by the shutter blades to generate a train of pulses, each equal in separation to 1/Nth number of light interruptions, (where N is selectable) and, in response to each pulse, means for advancing the shuttle tooth into engagement with the film perforations so that the film may be advanced by the next motion of the shuttle tooth in the direction of film feed. Thus, the film is engaged and advanced upon each reciprocation of the shuttle tooth when N equals one, and at a selectably slower rate when N is greater than one.
REFERENCES:
patent: 3672751 (1972-06-01), Martin
patent: 3694065 (1972-09-01), Roth
patent: 3702730 (1972-11-01), Russell
Bagby John P.
Figge Erwin E.
Kim Raymond W. H.
Adams Russell E.
Bell & Howell Company
Moore John H.
Peele, Jr. John E.
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