Electrophotography – Document handling – Copy
Patent
1996-05-20
1998-07-07
Moses, R. L.
Electrophotography
Document handling
Copy
399401, G03G 2100
Patent
active
057782970
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to an electrographic printer device for printing tape-shaped recording media of different tape widths with a possible return of the recording medium from the fixing station to the transfer printing station for producing duplex and color printing.
FIELD OF THE INVENTION
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 band-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 to a contradiction of contemporary demands made of raw materials'utilization. Many customized applications that wherein double-sided printing is compulsory (brochures, books, etc.) can thus not be satisfied, especially since electrographic highperformance printers are especially efficient when they are operated as free of interruption as possible.
For producing multi-color and backside printing with electrographic printer devices processing continuous stock, 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 is substantial due to the required, second printer.
The reference IBM Technical Disclosure Bulletin, Vol.22, No.6, November 1979, page 2466, FIG. 2, also discloses an electrophotographic printer device for printing tape-shaped recording media with which it is possible to print the recording medium on both sides. 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 fixing, 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 Xerox Disclosure Journal, Vol.9, No.3, May 1984, Stanford, Connecticut, USA, pages 2001 through 2003 discloses methods for duplex printing with a tape-shaped recording medium having differently constructed electrophotographic printer devices. In a first duplex printing process, a toner image is first applied on a front side of the recording medium and the recording medium together with the toner image is then turned over and the toner image is simultaneously fixed by a fixing means attached in the region of the turn-over device. After the turn-over event and the fixing of the toner image of the front side, a back-side toner image is applied with the assistance of the transfer printing station, this toner image being then in turn fixed with the assistance of a fixing means to the printer device at the output side.
In a second method for producing duplex printing, a toner image of the front side is first applied with the assistance of the transfer printing station. Subsequently, the recording medium is turned over and the application of the toner image of the back side then ensues. Both toner images are simultaneously fixed via a fixing station of the output side. In a third method for producing simplex pri
REFERENCES:
patent: 5467179 (1995-11-01), Boeck et al.
patent: 5526107 (1996-06-01), Bronstein
patent: 5546178 (1996-08-01), Manzer et al.
patent: 5568245 (1996-10-01), Ferber et al.
Manzer Hans
Reichl Helmut
Viechter Manfred
Moses R. L.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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