Electrophotography – Document handling – Copy
Patent
1998-07-01
1999-08-10
Beatty, Robert
Electrophotography
Document handling
Copy
399316, G03G 1500
Patent
active
059372591
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to an electrographic printer comprising an intermediate image carrier for the simultaneous printing of a first web section of an endless carrier material and of a second web section arranged next to the first web section at a distance therefrom. A transport device conducts the web sections along a transport path past the intermediate image carrier. At least one tension device pre-stresses the first web section and the second web section against the intermediate image carrier during the printing process. At least one web tenser is arranged following the transport device as viewed in the transport direction and which gives the web sections a tensile stress in the transport direction during the printing process. A compensation device is arranged between the transport device and the tension device that pre-stresses the first web section or the first and second web sections opposite the transport direction during the printing process.
The invention is concerned with an improvement of an electrographic printer unit for printing band-shaped recording media of different band width according to WO 94/27193. The printer unit disclosed therein has an electrographically working intermediate image carrier, for example a photoconductor drum, a usable width of which corresponds to twice the width format of a standard form according to DIN A4 or of a letter size format. The further units, such as the fixing station, the developer station, the cleaning station, etc., are likewise designed for this usable width.
Various operating modes are possible with this known printer unit. In what is referred to as the simplex mode, thus a recording medium having up to twice the width of a sheet in the DIN A4 format or in the letter size format can be printed in a traditional way. In a parallel simplex mode, two narrow recording media arranged side-by-side, for example with a width according to DIN A4, can be conducted through the printer unit and printed in juxtaposed position.
In a further operating mode, the single-color duplex mode, the web of the recording medium is turned over upon transport through the printer unit. During the first printing event, a first web section of the web is conducted past with the front side at the transfer printing location and is subsequently supplied to the fixing station in which the toner image is joined in smear-proof fashion to the continuous carrier material under the influence of heat and pressure. After the fixing, the web is laterally offset, turned over and resupplied to the transfer printing station in the form of a second web section and is printed on the back side. In this way, it is possible to simultaneously print the first and second web section at the same transfer printing location. A two-color duplex mode is also possible by employing differently colored ink particles in different developer units of the printer unit.
In another operating mode, the two-color simplex mode, the web is offset parallel by at least one web width upon transport in the printer unit, and the offset web sections are conducted past the transfer printing location in common in juxtaposed position. During the first pass of the web at the transfer printing location, image and text elements are printed with a first color and are subsequently fixed; image and text elements are printed with the second color during the second pass of the web with offset.
The printer unit disclosed by WO 94/27193 works according to the principle of electrophotography, whereby a photoconductor on which a latent charge image corresponding to the print format to be printed is applied with the assistance of a light source, for example a laser of an LED line, is employed as a photoconductor. Ink particles of a desired color are transferred onto the photoconductor within a developer station arranged close to the photoconductor and the charge image is inked with toner particles. The developer station is followed by the print unit in which a corona device arranged at a distance from the pho
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Patent Abstracts of Japan--JP57141346--Jan. 9, 1982--Shikato Masanobu--Change-Absorbing Mechanism In Continuous Paper Conveying Device.
Kopp Walter
Olbrich Otto
Sturzer Anton
Windele Josef
Beatty Robert
Oce Printing Systems GmbH
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