The United States of America as represented by the Secretary of the Treasury - Washington DC
International Classification:
G01N 2189 G01B 1106
US Classification:
356430
Abstract:
An optical paper detector for use in conjunction with a printing press for sensing the undesirable condition of more than a single sheet of paper being simultaneously fed to the press. The optical paper detector is comprised of an array of wide angle phototransistors connected in parallel which uniformly sense light transmittance through the paper over a relatively large and continuous area to provide an averaging effect so that the optical paper detector is relatively insensitive to local variations in light transmittance. The optical paper detector is equipped with a flat cover that permits flush mounting and provides a self-cleaning wiping action.
Name / Title
Company / Classification
Phones & Addresses
Kenneth Duvall Principal
N.E. Research Business Services at Non-Commercial Site