Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Method to Insure Uniform Nozzle Usage Printing Text

IP.com Disclosure Number: IPCOM000119798D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 55K

Publishing Venue

IBM

Related People

Bacon, JL: AUTHOR

Abstract

When printing text, multi-nozzle ink jet (and dot matrix) printers experience non-uniform nozzle usage due to the shape and frequency of usage of text characters and numbers. This problem is solved by selecting a vertical escapement distance such that each nozzle in the array prints a different portion of a character box in subsequent lines.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

Method to Insure Uniform Nozzle Usage Printing Text

      When printing text, multi-nozzle ink jet (and dot matrix)
printers experience non-uniform nozzle usage due to the shape and
frequency of usage of text characters and numbers. This problem is
solved by selecting a vertical escapement distance such that each
nozzle in the array prints a different portion of a character box in
subsequent lines.

      The number of nozzles required to print a line of text is
determined from the size of the characters in lines per inch (lpi)
(vertical) and the resolution in pixels or dots per inch (dpi).  For
6 lpi and 300 dpi, 50 nozzles are required per line of text.  A
straightforward approach aimed at maximizing printing speed would
utilize a head with at least 50 nozzles, such that one complete line
is printed in one pass of the print head (not a requirement, but
multiple passes would be required per line of text).  If a head with
50 nozzles (or multiple of 50 nozzles) is selected, then the minimum
vertical escapement would be 50 pixels.  As it can be seen, if 50
nozzles are required to print a line and the escapement is 50 pixels,
then nozzle #1 would print the first pixel line in each character box
for every text line, as would the other nozzles print respective
pixel line. This would cause the non-uniform usage of the nozzles
since those that line up with the top bar of the T, for example,
would see higher usage than those used to print the vertical stroke.
In fact, s...