Photographic exposure masks

Details Photographic exposure masks Photographic exposure masks

1983-04-27

1984-10-30

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for photosensitive paper

355 71, G03B 2758

Patent

active

044797133

ABSTRACT:
An exposure mask for photographic material has a measuring wheel and two adjustable mask blades. Movement of the photographic material causes rotation of the wheel, which causes a switching member to rotate. Whenever the switching member reaches a given position it operates a switch and stops the transport of the material. Adjustment of one mask blade adjusts the rate of rotation of the switching member relative to that of the measuring wheel by adjusting the axial position of a frustoconical roller that rests on the measuring wheel and drives the switching member.

REFERENCES:
patent: 3488119 (1970-01-01), Dixon et al.
patent: 3689149 (1972-09-01), Livingood
patent: 3732010 (1973-05-01), Harter et al.
patent: 3807861 (1974-04-01), Nosco et al.
patent: 4125326 (1978-11-01), Baert
patent: 4157221 (1979-06-01), Raven
patent: 4324488 (1982-04-01), Anderson et al.
patent: 4417810 (1983-11-01), Ueda et al.

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