Electrophotography – Document handling – Copy
Patent
1997-04-07
1998-08-18
Ramirez, Nestor R.
Electrophotography
Document handling
Copy
399401, G03G 2100
Patent
active
057970793
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a printer means for printing the front side and back side of a band-shaped recording medium having a turn-over means with appertaining delivery means arranged therein.
2. Description of the Related Art
A high economic customer benefit and a broad spectrum of flexibility are expected to a greatly increasing degree from modern electrographic printer systems. The effective utilization of printing materials as well as the flexible design of the print information play a great part therein.
Endlessly processing (fan-fold) electrographic printer systems that print a band-shaped recording medium on one side have prevailed in the marketplace everywhere that a high device availability given high printing volume and a broad spectrum of printing materials are required. These printer systems, however, have the disadvantage that it is not possible to switch between single-sided and double-sided printing. For the user, this leads both to an economically unfavorable situation as well as being contrary to the contemporary demands for efficient utilization of raw materials. Many customer-specific applications that necessarily require double-sided printing (brochures, books, etc.) can thus not be satisfied, particularly since electrographic high-performance printers are especially economical when they are operated interruption-free insofar as possible.
For generating multi-color and backside printing with electrographic printer devices working with continuous stock, European Patent Document EP-B1-01 54 695 has disclosed 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 because of the required second printer.
IBM Technical Disclosure Bulletin, Vol. 22, No. 6, November 1979, pages 2465-2466, also discloses an electrophotographic printer means for printing band-shaped recording media with which it is possible to print the recording medium on both sides. To this end, the recording medium is taken 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 with the assistance of a turn-over means composed of deflection rods and is resupplied to the transfer printing station. After the back side of the recording medium is printed with toner images, another fixing step ensues in the fixing station.
This old reference basically describes duplex printing with continuous stock recording media. However, the proposal never lead to a product. Further, the described electrographic printer means is only suitable for the both-sided printing of the recording medium. A change in operating mode is not provided. The turn-over means composed of deflection rods that is employed requires a manual threading of the recording medium; further, the way in which the deflection rods are arranged requires much installation space.
The reference XEROX DISCLOSURE JOURNAL, Volume 9, No. 3, May 1984, Stanford, Conn., USA, pages 201 through 203 discloses methods for duplex printing with a band-shaped recording medium having differently constructed electrophotographic printer devices. In a first duplex printing process, a toner image is thereby first applied to a front side of the recording medium, and then the recording medium together with the toner image is turned over and, simultaneously or immediately before the turning, the toner image is fixed with a first fixing means attached in the region of the turn-over means. Subsequently, a back side toner image is applied with the assistance of the transfer printing station, this then being in fixed with the assistance of another fixing means attached at the output side relative to the printer means. In a second method for producing duplex printing, a front side toner image is first applied with the assistance of the transfer printing station. Subsequently, t
REFERENCES:
patent: 5546178 (1996-08-01), Manzer et al.
patent: 5568245 (1996-10-01), Ferber et al.
IBM Technical Disclosure Bulletin, vol. 22, No. 6, Nov. 1979, K. Sanders, "Two-Path Electrophotographic Print Process", pp. 2465-2466.
Xerox Disclosure Journal, vol. 9, No. 3, May/Jun. 1984, E. McIrvine, "Method for Duplex Printing on Continuous Web Paper", pp. 201-203.
Creutzmann Edmund
Herzog Heinz
Kopp Walter
Ramirez Nestor R.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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