Printing head assembly

Details Printing head assembly Printing head assembly

1976-12-13

1978-07-11

Wintercorn, Richard A.

Photocopying

Contact printing

Machine

352228, 355117, G03B 2710

Patent

active

040998690

ABSTRACT:
A printing head assembly for exposing raw stock film with a preprint film in a contact film printer including a dual roller gate assembly. The dual roller gate assembly includes a pair of rollers mounted on a roller frame for engaging the preprint film and raw stock film on opposite sides of the printing aperture for wrapping both the preprint and raw stock film about a segment of the printing sprocket of substantially greater length than the printing aperture. An adjustable biasing spring permits regulation of the tension applied through the rollers to the film runs. The dual roller gate assembly includes a selectively operable retraction device to withdraw the rollers away from the printing sprocket for loading and unloading the film printer. In an alternate embodiment, the dual roller gate assembly is pivotally mounted by an offset shaft which permits pivotal movement of the dual roller gate assembly to provide clearance for loading the film printer.

REFERENCES:
patent: 2235907 (1941-03-01), Tondreau
patent: 2240083 (1941-04-01), Tondreau
patent: 2835180 (1958-05-01), Capstaff

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