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A THERMAL INK JET PRINTER HAVING MULTIPLE PRINTHEADS ALIGNED CO-LINEARLY

IP.com Disclosure Number: IPCOM000027454D
Original Publication Date: 1997-Feb-28
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 101K

Publishing Venue

Xerox Disclosure Journal

Abstract

To achieve a relatively high printing speed in a printing device employing thermal ink jet partial width printhead, a printing subsystem is composed of multiple printheads aligned co-linearly and spaced an equal distance apart, so that the actual scanning distance involved for each swath is a fraction of a page width. For example, in a 4-headed system printing a page width of 8 inches, each head would be spaced approximately 2.00 inches apart. Thus, the necessary scan distance of the printhead would be only 2.00 inches, if alignment and mechanical motion were perfect. Since tolerances in printhead location would create image gaps or unwanted overlap in such a system, the printing assembly actually scans a distance greater than 2.00 inches, such as 2.5 inches and the image is interleaved in order to blend in the joint between adjacent printheads.

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XEROX DISCLOSURE JOURNAL

A THERMAL INK JET PRINTER HAVING MULTIPLE PRINTHEADS

Kenneth W. Altfather Donald M. Stevens

ALIGNED CO-LINEARLY

Proposed Classification

U. S. C1.347/087 Int. C1. B41j 2/175

To achieve a relatively high printing speed in a printing device employing thermal ink jet partial width printhead, a printing subsystem is composed of multiple printheads aligned co-linearly and spaced an equal distance apart, so that the actual scanning distance involved for each swath is a fraction of a page width. For example, in a 4-headed system printing a page width of 8 inches, each head would be spaced approximately 2.00 inches apart. Thus, the necessary scan distance of the printhead would be only 2.00 inches, if alignment and mechanical motion were perfect. Since tolerances in printhead location would create image gaps or unwanted overlap in such a system, the printing assembly actually scans a distance greater than 2.00 inches, such as 2.5 inches and the image is interleaved in order to blend in the joint between adjacent printheads.

The following table provides a list of inputs and outputs for a four (4) printhead color system. Each of four (4) printheads has a row of 128 jets disposed linearly and having four (4) colors (24 jets for cyan, magenta, yellow each) and 48 jets for black. The speed for printing a letter-sized document with this system is approximately 1.2 pages per minute. A similar system, scanning with only one (1) printhead, is capable of printing only
0.7 page per minute; hence the 4-printhead system provides a 70% increase in print speed.

XEROX DISCLOSURE JOURNAL - Vol. 22, No. 1 JanuaryFebruary 1997 23

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A THERMAL INK JET PR...