Accession Number : ADD011632
Title : Apparatus and Circuits for Two-Color Printing in Electronic Impact Printers.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC
Personal Author(s) : Prager,J ; Hudson,N H
Report Date : 14 Feb 1978
Pagination or Media Count : 18
Abstract : Color control means for selectively positioning one color of a two-color ribbon between a document supporting platen and a print head having means for selectively impacting the desired ribbon portion against the document, said color control means comprising a color-select solenoid energized by logic circuitry responsive to a print-color signal. The solenoid is energized to a first position to enable characters of a first color to be printed at selected positions along a line. The logic circuitry includes means for selectively deleting the line feed, and delaying the print enable and print head movement signals during a time interval sufficient to allow for the color select solenoid to move the ribbon to the opposite color position at which time the characters of the opposite color are printed. A modification of the logic circuitry enables a dot-matrix impact printer capable of printing in both the forward and reverse directions to print a single line of intermixed characters of first and second colors in a somewhat similar fashion.
Descriptors : *PATENTS, *PRINTING EQUIPMENT, *COLORS, INKS, SELECTION, DUAL MODE, SOLENOIDS, LOGIC CIRCUITS
Subject Categories : Printing and Graphic Arts
Distribution Statement : APPROVED FOR PUBLIC RELEASE