Electrophotography – Document handling – Copy
Patent
1997-04-07
1998-12-01
Royer, William J.
Electrophotography
Document handling
Copy
G03G 1500
Patent
active
058451870
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to a turn-over means for band-shaped recording media arranged within an electrographic printer device.
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 to a contradiction of 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.
The publication 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 step, 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 ensues in the fixing station.
The printer device contains a turn-over means for band-shaped recording media with a paper admission channel and a paper outlet channel that are successively arranged in one plane, whereby the recording medium, proceeding from the paper admission channel, is guided via deflection elements up to the paper outlet channel such that the recording medium folds completely over around the boundary line between the channels.
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.
In such electrographic printer devices for printing band-shaped recording media in duplex printing, the recording medium is successively conducted through the units of the printer device via two conveying paths lying side-by-side. The turn-over station thereby has the job, first, of turning the recording medium over by 180.degree. in terms of page position; second, it must steer the recording medium from the one into the other conveying path. In order to keep the width of the units as small as possible and in order to use this as efficiently as possible, it is necessary to guide the recording medium
REFERENCES:
patent: 4154386 (1979-05-01), Kawada
patent: 4610198 (1986-09-01), Raymond
patent: 5467179 (1995-11-01), Boeck et al.
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, New York, U.S. K. Sanders, "Tow-Path Electrophotographic Print Process".
Eggerstorfer Vilmar
Ferber Otto
Oce Printing Systems GmbH
Royer William J.
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