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A LOW COST METHOD OF PRODUCING DUPLEX PRINTS IN A THERMAL INK JET SYSTEM

IP.com Disclosure Number: IPCOM000026799D
Original Publication Date: 1993-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 117K

Publishing Venue

Xerox Disclosure Journal

Abstract

As depicted in Figures 1 and 2, a low cost method of producing a two-pass duplex print in a Thermal Ink Jet System is disclosed. A principle advantage of this type of system is a low cost, since the paper path is much shorter than a conventional recirculating loop, and the expense of an inverter is eliminated. The relatively simple arrangement of the direct marking system allows bidirectional operation. This enables a sheet, after first side printing and return via a simple return loop, to be passed back under the printhead, in the opposite direction, for a second pass. Two fundamentally different approaches to applying the second side image are:

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XEROX DISCLOSURE JOURNAL

A LOW COST METHOD OF PRODUCING DUPLEX PRINTS IN A THERMAL INK JET SYSTEM
Bruce J. Parks
William
R. Burger
Edward
C. Hanzlik

Proposed Classification
U.S. C1.346/140R Int. C1. Gold 15/16

FIG. 1

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 18,No. 5 SeptembedOctober 1993 481

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A LOW COST METHOD OF PRODUCING DUPLEX PRINTS IN A THERMAL INK JET SYSTEM(Cont'd)

As depicted in Figures 1 and 2, a low cost method of producing a two-pass duplex print in a Thermal Ink Jet System is disclosed. A principle advantage of this type of system is a low cost, since the paper path is much shorter than a conventional recirculating loop, and the expense of an inverter is eliminated. The relatively simple arrangement of the direct marking system allows bidirectional operation. This enables a sheet, after first side printing and return via a simple return loop, to be passed back under the printhead, in the opposite direction, for a second pass. Two fundamentally different approaches to applying the second side image are:

1) Bidirectional Printing, as illustrated in Figure 1, where a paper sheet enters at the region indicated by arrow 12. The paper sheet is then advanced by print transport 14 so as to pass beneath printhead assembly 16, where an image is deposited on the paper sheet. Subsequently, dryer 1, represented by reference numeral 18, drys the ink deposited on a first surface of said sheet. Subsequently, the sheet is transported by print transport 14 into a return loop path designated generally by reference numeral 20. The sheet then returns in the opposite direction beneath printhead assembly 16 where the opposite side of the sheet is imaged, prior to passin...