METHOD OF MARGIN ALIGNMENT AND PLANE-TO-PLANE REGISTRATION IN A TANDEM COLOR ELECTROPHOTOGRAPHIC MACHINE

摘要

A method of setting a plurality of margins in an electrophotographic machine (10) includes setting a top margin for a reference color black (K) by establishing a first time delay between a vertical synchronization signal (Vsync) and a first line. A right margin or a left margin for the reference color black (K) is set by establishing a second time delay between a horizontal synchronization signal (Hsync) and a start of printing. The other of the right margin and the left margin is set by adjusting a scan speed of a laser beam (38) across a photoconductive element (28) and adjusting a process speed in the cross-scan direction (54) including the speed of the photoconductive element (28), image accumulation member (36), and print medium. A bottom margin is set by adjusting the process speed. The other three color planes, cyan (C), magenta (M) and yellow (Y) are then registered or aligned to the reference color plane, black (K).