Browse Prior Art Database

INSTANT (OR IMMEDIATE) DUPLEX ARCHITECTURE

IP.com Disclosure Number: IPCOM000025647D
Original Publication Date: 1986-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 6 page(s) / 205K

Publishing Venue

Xerox Disclosure Journal

Abstract

There are here described several concepts for simultaneous/ instanUimmediate duplexing of a xerographic copy. These concepts allow for two sided copying of two sided documents thus cutting throughput time, increasing reliability, and reducing the number of paper feeders.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 51% of the total text.

Page 1 of 6

XEROX DISCLOSURE JOURNAL

INSTANT (OR IMMEDIATE) DUPLEX ARCHITECTURE U.S. C1.355/3SH Michael A. Malachowski

Proposed Classification

Int. C1. G03g 15/00

fo c-.-.-u I

Volume 11 Number 6 November/December 1986 297

[This page contains 1 picture or other non-text object]

Page 2 of 6

INSTANT (OR IMMEDIATE) DUPLEX ARCHITECTURE (Cont'd)

              XEROX DISCLOSURE JOURNAL 298 Volume 11 Number 6 November/December 1986

[This page contains 1 picture or other non-text object]

Page 3 of 6

INSTANT (OR IMMEDIATE) DUPLEX ARCHITECTURE (Cont'd)

     XEROX DISCLOSURE JOURNAL
Volume 11 Number 6 November/December 1986 299

[This page contains 1 picture or other non-text object]

Page 4 of 6

INSTANT (OR IMMEDIATE) DUPLEX ARCHITECTURE (Cont'd)

There are here described several concepts for simultaneous/ instanUimmediate duplexing of a xerographic copy. These concepts allow for two sided copying of two sided documents thus cutting throughput time, increasing reliability, and reducing the number of paper feeders.

In the concept shown in Figure 1, a simultaneous transfer (i.e. dual transfer) employs dual scanning of both sides of a document 5 using a swingable platen glass 3. Dual lenses 6,6' transmit the light images to the exposure stations 7, 7' of dual photoreceptors 8,8'. The image transfer stations 10, 10' are disposed opposite one another so that the copy sheet 12 passes through transfer stations 10, 10' simultaneously. As a result, the developed images are transferred simultaneously from photoreceptors 8,8' to copy sheet 12.

With this method, both sides of the document 5 are scanned at the same time and transferred to the copy sheet 12 simultaneously as soon as the sheet arrives at the transfer stations 10,lO'.

In Figure 2, a two-stage or step transfer arrangement is shown in which the transfer stations 10,lO' are offset from one another. As a result, the developed images are transferred first to one side and then to the other side of the copy sheet 12.

In Figure 3 a two pass (instant copy sheet inversion) method uses an inverter 15 immediately after transfer station 10. Inverter 15 sends the copy sheet 12 back for immediate re-registration and re-transfer. This method also requires immediate inversion of the document 5 for two sided copying. This is effected by a document handler 16 having an inverting gate 17 for presenting one side or the other of the document 5 on platen glass 3.

In Figure 4, a two step transfer method is shown in which a single photoreceptor 8 is employed having two transfer stations 10, 10' on opposite sides. The copy sheet 12, which is fed from a feeder 19, passes to the first transfer station 10 where the developed image from one side of the document is transferred from photoreceptor 8 to one side of sheet 12. Following transfer, the image is fixed and the sheet inverted by an inverter 20. Then the inverted sheet is transported to the second transfer station 10' where the developed image from the other side of the document is transferred to th...