Electrophotography – Document handling – Copy
Patent
1996-04-01
1998-01-27
Pendegrass, Joan H.
Electrophotography
Document handling
Copy
399384, 399402, G03G 1500
Patent
active
057130710
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to a multi-functional electrographic printer device for single-sided or both-sided printing of web-shaped recording media in start/stop mode.
DESCRIPTION OF THE RELATED ART
A high economic benefit to the customer and a broad spectrum of flexibility are expected from modern electrographic printer systems to a greatly increasing extent. Both the effective utilization of printing materials as well as the flexible fashioning of the print information play a large part therein.
Endlessly processing (fan-fold) electrographic printer systems that print a web-shaped recording medium on one side have prevailed everywhere in the marketplace where a high device availability given high printing volume and a broad spectrum of material to be printed are demanded. These printer systems, however, have the disadvantage that it is not possible to change between single-sided and double-sided printing. For the user, this leads both to an economically unfavorable situation as well as being contrary to contemporary demands to maximize raw materials' utilization. Many customized applications wherein double-sided printing is compulsory (brochures, books, etc.) can thus not be satisfied, especially since electrographic high-performance printers are especially efficient when they are operated as free of interruption as possible.
For producing multi-color and double-sided printing with electrographic printer devices processing continuous stock, European Patent Document EP-B1-01 54 695 discloses that two continuous stock printers be operated following one another, whereby the paper printed in the first printer is turned over and is subsequently printed on the second side in the second printer.
The outlay for this known system is substantial due to the required, second printer.
The reference publication IBM Technical Disclosure Bulletin, Vol.22, No.6, November 1979, page 2466, in FIG. 2, also discloses an electrophotographic printer device for printing web-shaped recording media with which it is possible to print on both sides of the recording medium. To this end, the recording medium is pulled from a supply stack, supplied to a transfer printing station and provided with toner images on one side. After the toner fixing step, the recording medium is turned over and is resupplied to the transfer printing station. Another fixing in the fixing station ensues after the back side of the recording medium has been printed with toner images.
This old reference fundamentally discloses duplex printing with continuous stock recording media. The proposal, however, never led to a product. Further, the electrographic printer device disclosed therein is only suited for both-sided printing of the recording medium. A change of operating modes is not provided.
The reference publication Xerox Disclosure Journal, Vol.9, No.3, May 1984, Stanford, Conn., USA, pages 201 through 203, "Method for Duplex Printing on Continuous Web Paper", fundamentally discloses the possibility of printing continuous stock in simplex printing and duplex printing with one printer.
The known apparatus, however, does not include a switchable deflection means, and an adaptation of the fixing station is required when changing operating modes.
The high-precision allocation of the individual device components needed for the operation of the printer device continues to require a stable structure of the apparatus.
High-performance printer devices for continuous stock paper are increasingly developing into components of extensive systems wherein the pre-processing and after-processing of the papers, backside and color printing play an increasing role in addition to the actual print production. A structure that enables a flexible adaptation to the system environment is therefore advantageous.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an electrographic printer device for printing web-shaped recording media in changing operating modes with one and the same apparatus that is flexibly construc
REFERENCES:
Japanese Abstract, vol. 17, No. 77, Feb. 16, 1993, M-1367, 4-278372.
K. Sanders, "Two-Path Electrophotographic Print Process", IBM Technical Disclosure Bulletin, vol. 22, No. 6, Nov. 1979, pp. 2465-2466.
Grainger Quana
Pendegrass Joan H.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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