Gating Delay Algorithm for Print Registration in Cut Sheet Printers
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2005-Feb-15
This article describes an algorithm which registers print image onto paper with ` 1-pel (1/240 inches) accuracy. Its implementation has yielded very accurate print registration that meets specification for optical character recognition applications. (Image Omitted) Various cut sheet printers use a stepper motor and optical sensor to properly register the print image onto paper. Timing of this registration operation is synchronized to the photoconductor by the tachometer and belt sync signals. The belt sync is generated once per belt revolution when a mark on the belt is detected. Timing relative to the belt sync signal is done through tachometer pulses which are generated by an encoder attached to a photoconductor roller. Each tachometer count corresponds to one pel of paper travel along the paper path, or 161.