Apparatus for automatically engraving mimeographic stencil papers

Abstract

In effecting the two-color printing from an original which is printed in black and other color by way of a mimeographic printing technique, apparatus for automatically engraving mimeographic stencil papers which decomposes the black or other colors of the original independently into two colors and reads them out to engrave two stencil papers. The engraving apparatus comprises two light-receiving elements (3,4) for reading the contents displayed on the original, color filters having different spectral characteristics which are attached to the light-receiving elements and are faced to the original, and a circuit (C) for selecting the colors to be engraved depending upon the outputs of the light-receiving elements. A single automatic engraving apparatus makes it possible to easily prepare the stencil papers for two-color printing and to reduce the color deviation when the original is set to the engraving apparatus.

Dependencies are inferred from the claim text.