Browse Prior Art Database

SINGLE PASS DUPLEX WITH TANDEM THERMAL INK JET MARKING STATIONS

IP.com Disclosure Number: IPCOM000027275D
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 193K

Publishing Venue

Xerox Disclosure Journal

Abstract

A single pass duplex system utilizing tandem thermal ink-jet (TIJ) marking assemblies is proposed. The direct marking capability of TIJ lends itself to a compact and cost effective arrangement to deliver efficient single pass duplex performance. An additional feature is the ability to provide a simplex-only printing mode should one marking station fail, thus improving overall up-time.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

SINGLE PASS DUPLEX WITH TANDEM THERMAL INK JET MARKING STATIONS
Bruce J. Parks
William R. Burger
Edward C. Hanzlik

Proposed Classification

U.S. C1.346/139R Int. C1. Gold 15/16

74 76' 18'

FIG. 1

FIG. 2

    16 18 14 I I

12 J

FIG. 3

XEROX DISCLOSURE JOURNAL - Vol. 21, No. 1 January/February 1996 19

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Page 2 of 4

SINGLE PASS DUPLEX WITH TANDEM THERMAL INK JET
MARKING STATIONS (Cont'd)

A single pass duplex system utilizing tandem thermal ink-jet (TIJ) marking assemblies is proposed. The direct marking capability of TIJ lends itself to a compact and cost effective arrangement to deliver efficient single pass duplex performance. An additional feature is the ability to provide a simplex-only printing mode should one marking station fail, thus improving overall up- time.

This proposal also focuses on the application of Full Width Array (FWA) technology, though the tandem concept is applicable to Partial Width Array (PWA) technology as well.

Referring to Figures 1 through 3, the components comprising the marking engine include two each of the following: FWA assembly 16, dryer 18, print transport 12, and printhead maintenance station 14. Several arrangements are possible. Figure 1 represents a straight paper path 10 wherein marking components reside on each side of a straight through paper path. In a production intent design, a high parts commonality is difficult to achieve, though the straight paper path provides good reliability, low shut-down rate, and low cost. Figure 2 shows a straight paper path with inversion 20.
Marking components reside on the same side of the paper path, with a sheet inverter 26 located between the marking stations. Though productivity is somewhat less than the Figure 1 concept due to the sheet inversion parts commonality between the marking stations is optimal. However, the low shut- down rate would be worse than that for the straight paper path shown in Figure 1. Figure 3 shows a U-shaped paper path 30 wherein marking components reside on each side of a U-shaped paper path 32. This configuration delivers productivity as high as the straight paper path of Figure
1. Parts commonality is mediocre, and the low shutdown rate is less than optimal.

References

US Patent No. 4,595,303 to Kuzuya et a1 teaches a printing machine with two printheads. The machine consists of a first and second printing assembly supported on a carrier which reciprocates along a line of printing defined on a platen. has typed elements adopted to be

line of printing. The second printing assembly consists of a dot matrix, wire dot, thermal, or ink-jet type head. The second printing assembly is also supported on the same carrier, but has a separate printing point on the platen.

Japanese Laid Open Application No. 57-148675 teaches a double-sided recorder. More specifically, one side of a recording paper is recorded with an under surface recording head while the other side is...