Color printer having reduced first copy out time and extended ph

Details Color printer having reduced first copy out time and extended ph Color printer having reduced first copy out time and extended ph

1993-04-23

1994-08-30

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

To produce color reproduction

355212, 355327, G03G 512

Patent

active

053427157

ABSTRACT:
An apparatus and method is presented for forming multiple color images on separate pitches of a photoreceptor belt and for registering the images and avoiding exposure of said images on the belt seam. In one embodiment, four LED print bars each form a color image on separate pitches of a photoreceptor belt, the images superimposed on each other to form a composite color image which is transferred to an output sheet. A photosensor is placed beneath each print bar and a belt hole formed on the belt surface a few scan lines before the start of an associated belt pitch. One of the belt holes has a dimension which is larger than the other holes and its location is sensed to provide information as to the location of the belt seam. Each belt hole, as the belt rotates, is detected by the sensor which produces a signal corresponding to detection of the trailing edge of the hole. This output signal is generated for each of the three downstream print bars and a signal is applied to each print bar to start the image exposure sequence in registration with first image exposure. The imaging operation can begin with first detection of a hole by the print bar producing the first color image. The first hole need not be the hole associated with the belt seam since the control circuitry will identify the seam sensing hole signal by the different nature of the sensor signal and will delay the exposure of the related pitch so as to ensure that the subsequent image does not overlie the seam.

REFERENCES:
patent: 4660059 (1987-04-01), O'Brien
patent: 4833503 (1989-05-01), Snelling
patent: 5040003 (1991-08-01), Willis
patent: 5175570 (1992-12-01), Haneda et al.
patent: 5208633 (1993-05-01), Genovese

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