Reciprocating color printing system with specified positioning of printing heads relative to a printing sheet

Abstract

Abstract A color printing system for color-printing images or characters on a surface of a writing sheet. The color printing system comprises a plurality of printing heads (A→D) which are successively arranged in parallel to each other and a feeding device for moving the writing sheet in a direction perpendicular to the head-reciprocating directions. Each of the printing heads linearly reciprocates so as to go and return in directions along the surface of the writing sheet for the color printing and has a plurality of ink-discharging nozzles (I→N). The plurality of ink-discharging nozzles are successively arranged with a pitch which is equal to or greater than the twice pitch of lines to be finally printed by the printing heads so as to write the images or characters on the writing sheet. The feeding device moves the writting sheet in a direction perpendicular to the head-reciprocating directions. When each of the printing heads (A→D) performs the going-direction printing operation, the feeding device moves the writting sheet by a distance corresponding to M times of the line-printing pitch where M is a predetermined number, and when the same printing head performs the returning-direction printing operation, the feeding device moves the writting sheet by 2N - M where N is the number of the ink-discharging nozzles (I→N).

Inventors

• 👤 Toshiyuki Iwazawa
• 👤 Masayoshi Miura

Bibliographic Details