Full-width film-supporting, driving, and stripping arrangement f

Details Full-width film-supporting, driving, and stripping arrangement f Full-width film-supporting, driving, and stripping arrangement f

1976-09-13

1977-10-11

Moses, Richard L.

Photocopying

Contact printing

Machine

355111, G03B 2722

Patent

active

040532305

ABSTRACT:
The present invention replaces the film supporting and stripping arrangement in the most widely-used conventional motion picture film printing machine with a film driving sprocket and a combined supporting and stripping drum which drive and fully support both the superimposed negative film and copy film throughout their entire widths and prevents them from moving apart from one another as they pass through the exposure zone wherein the exposure light passes through the two films but not beyond the combined supporting and stripping drum which obstructs the further passage of the light so that it is either reflected or deflected backward from the drum. While they are passing through the exposure zone, the two films are driven by a single toothed sprocket which maintains them in synchronism while the stripping drum supports them throughout their entire width and thus prevents the intermittent separation of the negative film and copy film in the exposure zone occurring in conventional machines wherein the films are supported only at their opposite edges, and consequently prevents the lack of sharp definition in the copy film caused by such intermittent separation.

REFERENCES:
patent: 2552255 (1951-05-01), Capstaff
patent: 3382787 (1968-05-01), Jeffee et al.
patent: 3715159 (1973-02-01), Allport
patent: 3970386 (1976-07-01), Wohlrab

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