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MAXIMIZING USE OF IMPULSE TYPE INK JET NOZZLES IN A RECIPROCATING CARRIAGE PRINTER

IP.com Disclosure Number: IPCOM000025177D
Original Publication Date: 1983-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

Impulse type ink jets deliver ink drops on demand to paper for image formation. Use of these devices for a reciprocating carriage output printer requires a plurality of jets so that sufficient information can be printed at reasonable speeds. If requirements dictate that 1/6 of an inch swaths be printed every carriage scan, as the industry standard demands, a number of jets equal to R x 1/6 are required for a printhead, where R = dot resolutin in dots per inch. Such resolution is required for graphics. However, when orthographics information (characters) are printed, most drops originate from 1/8 of an inch swaths, i.e., capital letters plus lower case with descenders. Ascenders are typically used for special fonts or extra large characters.

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XEROX DISCLOSURE JOURNAL

MAXIMIZING USE OF IMPULSE TYPE INK JET NOZZLES IN A RECIPROCATING CARRIAGE PRINTER
Matthew P. Wojciechowski

Proposed Classification
U.S. C1. 346/75 Int. Cl. Gold 15/18

Impulse type ink jets deliver ink drops on demand to paper for image formation. Use of these devices for a reciprocating carriage output printer requires a plurality of jets so that sufficient information can be printed at reasonable speeds. If requirements dictate that 1/6 of an inch swaths be printed every carriage scan, as the industry standard demands, a number of jets equal to R x 1/6 are required for a printhead, where R = dot resolutin in dots per inch. Such resolution is required for graphics. However, when orthographics information (characters) are printed, most drops originate from 1/8 of an inch swaths, i.e., capital letters plus lower case with descenders. Ascenders are typically used for special fonts or extra large characters.

By incorporating the capability of stepping the paper in increments of 1 /24 and 1 /8 of an inch for each 1/6 swath, the required resolution is obtained with fewer jets. Such an embodiment requires only R x (1/6 - 1/24) = R x 1/8 jets. Placement of ascenders can then be done by stepping the paper 1/24 of an inch and then 1/8 of an inch. Other characters and special fonts can be printed by stepping the paper 1/6 of an inch.

This type of printing requires no extra font design work; only some possible new design rules, since all fonts are typ...