Browse Prior Art Database

DIRECT ELECTROSTATIC POSTER DISPLAY PRINTER

IP.com Disclosure Number: IPCOM000026085D
Original Publication Date: 1990-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

Direct Electrostatic Printing (DEP) is a simple inexpensive computer controlled means of creating images on paper directly from digital information. DEP in large format (up to several feet wide by any length) provides an immediate interactive means for conveying information in the form of quality toner images on paper to replace chalk boards, hand charts, viewgraph projectors, etc. Temporary displays at meetings and conferences can be made by projecting toner onto paper without the need of a fuser. The paper can be unrolled and passed by a horizontal printbar having the dimensions of a few inches on a side - about the size of a chalk tray. The paper can be wound onto an upper roller. Optionally, prior to roll-up the toner image can be removed with a vacuum knife, enabling reuse. Alternatively, a fuser may be added to provide permanent records or posters. The device can also perform all the functions now executed by Versatec plotters.

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XEROX DISCLOSURE JOURNAL

DIRECT ELECTROSTATIC Proposed Classification POSTER DISPLAY PRINTER U.S. C1.346/159
Fred W. Schmidlin
Robert H. Marchessault
Michael M. Shahin

Int. C1. Gold 15/06

Direct Electrostatic Printing (DEP) is a simple inexpensive computer controlled means of creating images on paper directly from digital information.

DEP in large format (up to several feet wide by any length) provides an immediate interactive means for conveying information in the form of quality toner images on paper to replace chalk boards, hand charts, viewgraph projectors, etc. Temporary displays at meetings and conferences can be made by projecting toner onto paper without the need of a fuser. The paper can be unrolled and passed by a horizontal printbar having the dimensions of a few inches on a side - about the size of a chalk tray. The paper can be wound onto an upper roller. Optionally, prior to roll-up the toner image can be removed with a vacuum knife, enabling reuse. Alternatively, a fuser may be added to provide permanent records or posters. The device can also perform all the functions now executed by Versatec plotters.

Long printheads can be constructed from "state-of-the-art" nominal length ( 1 ft.) printheads. To minimize the visibility of stitch errors overlapping staggered printbars can be utilized so the transition from one printbar to its neighbor can be chosen at random for successive rows. The transition width can be made many pixels wide while the pixels...