Photographic roller copying apparatus with a device for threadin

Details Photographic roller copying apparatus with a device for threadin Photographic roller copying apparatus with a device for threadin

1984-10-22

1986-01-28

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Detailed holder for photosensitive paper

355 29, 355 32, 355 71, G03B 2758

Patent

active

045667845

ABSTRACT:
In a photographic copying apparatus, a device for threading a starting end of a new copying paper roll includes drive rollers, a guide support for the advanced paper and a pivotable flap which periodically closes on the paper when the advancement is interrupted for a threading process. An opening is formed in the flap to produce a test copy for controlling the operation of the apparatus. An exposure control device loads the test copy with empirically determined amounts of light when no negative is present on a negative platform of a printing station.

REFERENCES:
patent: 1325198 (1919-12-01), Hochstetter
patent: 3807855 (1974-04-01), Zajac
patent: 4257702 (1981-03-01), Miller
patent: 4452529 (1984-06-01), Olsson

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