Aperture-controlling device in a variable-scale photocopying mac

Details Aperture-controlling device in a variable-scale photocopying mac Aperture-controlling device in a variable-scale photocopying mac

1980-01-03

1981-08-18

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

354273, 355 61, G03B 2772

Patent

active

042843472

ABSTRACT:
In a variable-scale photocopying machine having a photosensitive medium, a light source, an optical system for projecting light from the source as an exposure light beam onto the medium, and a scale-varying mechanism, the width of the light beam is adjustable by an adjusting mechanism, which is actuated by a tensioned cord connected thereto when the cord is deflected by an adjusting member in response to movement of the scale-varying mechanism thereby to adjust the quantity of the exposure light to suit each scale of photocopying.

REFERENCES:
patent: 2900869 (1959-08-01), Bjelland et al.
patent: 3211053 (1965-10-01), Wanielista et al.
patent: 3408145 (1968-10-01), Walzberg
patent: 3618502 (1971-11-01), Congrove

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