Apparatus and method for obtaining color plane alignment in a si

Details Apparatus and method for obtaining color plane alignment in a si Apparatus and method for obtaining color plane alignment in a si

1998-03-18

1999-12-28

Royer, William J.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347248, 399301, B41J 2385, G01D 1506, G03G 1501

Patent

active

060088265

ABSTRACT:
A system for controlling color plane image alignment in a multi-color, single pass laser printer achieves such alignment by imprinting of alignment marks directly on a belt which carries and/or drives media sheets past plural developer modules in a process direction. A pair of sensors are positioned adjacent the belt to enable a sensing of the alignment marks. A controller causes each of a plurality of developers to print a set of alignment marks on the belt, each set including plural marks that are positioned transverse to a print process direction. The controller, in response to the sensors' detecting the printed marks on the belt, determines times at which the marks pass beneath the sensors and, from such determined times, derives variations from expected sense times of the marks of each set. Thereafter, the controller adjusts data feed from color plane sub-images to one or more laser scanners in such a manner as to reduce color plane image misalignments.

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patent: 5875380 (1999-02-01), Iwata et al.

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