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METHOD FOR MORE UNIFORMLY DISTRIBUTING EXCESS HEAT GENERATION IN A MULTI-PRINTHEAD INK JET PRINTER

IP.com Disclosure Number: IPCOM000027641D
Original Publication Date: 1998-Jun-30
Included in the Prior Art Database: 2004-Apr-08
Document File: 4 page(s) / 156K

Publishing Venue

Xerox Disclosure Journal

Abstract

Excess heat generated in a multi-printhead ink jet printer can be better managed by mixing black and colored jets in two printheads, rather than having one black printhead and one color printhead (magenta, cyan, yellow). This would enable printing stress documents (solid black, color pictures) more rapidly without slowing down the printing.

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XEROX DISCLOSURE JOURNAL

METHOD FOR MORE UNIFORMLY DISTRIBUTING EXCESS HEAT GENERATION IN A MULTI-PRINTHEAD INK JET PRINTER
Peter A. Torpey

Proposed Classification
U. S. C1.347/026 Int. C1. B41j 2/165

Excess heat generated in a multi-printhead ink jet printer can be better managed by mixing black and colored jets in two printheads, rather than having one black printhead and one color printhead (magenta, cyan, yellow). This would enable printing stress documents (solid black, color pictures) more rapidly without slowing down the printing.

Consider a two-printhead ink jet printer, with one printhead containing only black ink, and the other containing cyan, magenta, and yellow inks. This is a typical configuration for a color-enabled ink jet printer which is also capable of printing black only documents at a much faster rate than color documents.

Analysis of a wide variety of images desired by customers shows that, for color documents, very little black ink is used. Thus, the duty cycle and associated heat generation of the colored printhead is relatively high compared to the black printhead. This means that the temperature of the colored printhead will rise more rapidly than that of the black printhead (which remains cool), and the printer will have to slow down in order to avoid producing the print quality defects typically associated with excess temperature of the printhead.

On the other hand, for a monochrome document, the duty cycle and associated heat generation of the black printhead is high, while the colored printhead does not print or generate heat at all. This means that the temperature of the black printhead will rise (while that of the colored printhead does not) and the printer will again have to slow down in order to avoid producing the print quality defects typically associated with excess temperature of the printhead.

In both of the above cases, one printhead may become excessively hot while the other remains cool. Unfortunately, the printer must be slowed in either case to avoid failure.

The concept proposed here is to intermix the black and colors between the two printheads. For example, if the typical two-printhead arrangement of colors is given by:

XEROX DISCLOSURE JOURNAL - Vol. 23, No. 3 May/June 1998 125

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METHOD FOR MORE UNIFORMLY DISTRIBUTING EXCESS HEAT GENERATION IN A MULTI-PRINTHEAD INK JET PRINTER(C0NT"D)

Color

 Black cyan Magenta

Black Printhead (jets) Color Printhead (jets)

1-320 --

-- 1-104 -- 109-212

then a rearrangement of the colors based on the concepts described above may be:

Color

 Black cyan Magenta Yellow

Printhead 1 (jets) Printhead 2 (jets)

1-104 105-212 -- 1-100

109-208 -- 217-316 --

This rearrangement of the colors between the two printheads distributes the black print...