Browse Prior Art Database

SINGLE PASS DUPLEX IN ELECTRONIC SYSTEMS

IP.com Disclosure Number: IPCOM000025218D
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 115K

Publishing Venue

Xerox Disclosure Journal

Abstract

Paper path reliability and avoidance of paper jams are major considerations in high volume systems, and particularly in printing systems where it is desired to achieve as high an availability as possible. In this regard, one of the major concerns with using the traditional reprographic machine is the added complexity of the machine duplex paper path which is long, has bends, and uses an inverter or duplex tray to achieve duplexing. However, duplexing is essential since there is a perceived trend toward higher information density on any given sheet.

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XEROX DISCLOSURE JOURNAL

SINGLE PASS DUPLEX IN ELECTRONIC SYSTEMS U.S. C1. 355/3R Ronald A. Andrews

Proposed Classification

Int. Cl. G03g 15/00

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FUSER POWER

SUPPLY

Paper path reliability and avoidance of paper jams are major considerations in high volume systems, and particularly in printing systems where it is desired to achieve as high an availability as possible. In this regard, one of the major concerns with using the traditional reprographic machine is the added complexity of the machine duplex paper path which is long, has bends, and uses an inverter or duplex tray to achieve duplexing. However, duplexing is essential since there is a perceived trend toward higher information density on any given sheet.

To address this concern, numerous proposals for web paper feed systems with dual marking systems have been offered. In the alternative, dual xerographic systems with cut sheet paper and gripper type feed bars for transporting the cut sheets have been proposed.

One partial solution to the constraints imposed on the paper supply flexibility by the use of a web and the impact on expense and reliability imposed by the use of

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SINGLE PASS DUPLEX IN ELECTRONIC SYSTEMS (Cont'd)

dual xerographic systems is to utilize a cut sheet system with immediate duplex. However, for high speed applications, there is concern that immediate duplex may require that pitches be skipped with resulting reduction in productivity.

In electronic front end marking systems, the image on the photoreceptor can be scanned in either a normal or mirror image mode. This fact enables single pass duplexing.

Referring to the drawing figure, the electronic marking system 3 thereshown has a paper path 4 that is relatively straight from paper supply through transfer and fusing stations 5, 6 respectively to the machine output. For duplex operation, images are alternately created on the photoreceptor 7 in normal image (first side) and mirror image (second side) modes. At the same time, copy paper is fed every other pitch...