Dual sprocket contact motion picture film printer

Details Dual sprocket contact motion picture film printer Dual sprocket contact motion picture film printer

2008-07-15

2008-07-15

Fuller, Rodney E (Department: 2862)

Optics: motion pictures

Miscellaneous

C355S078000

Reexamination Certificate

active

07400378

ABSTRACT:
A dual sprocket contact motion picture film printer maintains film steadiness when running a film negative in contact with an unexposed raw stock film by tensioning perforations along one film side against sprocket teeth of a full fitting sprocket and a shrinkage sprocket on the other side. The films pass through a fluid chamber before passing through a printer aperture and a vacuum pressure applied from one side of the chamber tensions the negative against the sprocket teeth while a positive fluid pressure applied from an opposite side tensions the raw stock against the sprocket. The films are self-aligned by the fluid forces maintaining equal tension on both sides of each film strip as the films pass the aperture of the film printer.

REFERENCES:
patent: 2153214 (1939-04-01), Tondreau
patent: 2235907 (1941-03-01), Tondreau
patent: 3970386 (1976-07-01), Wohlrab
patent: 4053230 (1977-10-01), Balousek
patent: 5225869 (1993-07-01), Levine et al.
patent: 5812245 (1998-09-01), Goodhill et al.

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