Electrophotography – Document handling – Copy
Patent
1998-07-16
1999-11-16
Beatty, Robert
Electrophotography
Document handling
Copy
399311, G03G 1500
Patent
active
059872993
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is directed to an electrographic printer with a printing unit that comprises a photoconductor provided with a toner image during the printing process and comprises a corona device arranged at a distance from the photoconductor that generates an electrical field during the printing process for transferring the toner image onto an endless carrier material, whereby the printer--in a first operating mode--can print a first web section of the endless carrier material conducted along a transport path and--in a second operating mode--can simultaneously print a second web section conducted along a parallel transport path and arranged next to the first web section at a distance therefrom.
BACKGROUND OF THE INVENTION
The invention is concerned with an improvement of an electrographic printer means for printing web-shaped recording media of different web width according to WO 94/27193. The printer means disclosed therein has an electrographically working intermediate carrier, for example, a photoconductor drum, having a usable width corresponding to twice the width format of a standard form according to DIN A4 or twice the width of standard 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 means. In what is referred to as the simplex mode, thus, a recording medium having up to twice the width of a DIN A4 sheet or of a sheet in letter size format can be printed in a traditional form. In a parallel simplex mode, two narrow recording media arranged side-by-side, for example having a width according to DIN A4, can be conducted through the printer means and be printed in juxtaposed position.
In a further operating mode, the single-color duplex mode, the web of the recording medium is turned over during transport through the printer means, so that two web sections derive in a first web section, the front side of the web resides opposite the transfer printing location of a printing unit, whereas the back side of the web in a second web section is simultaneously printed 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 printing unit.
In another operating mode, the two-color simplex mode, the web is offset parallel by at least one web width during transport in the printer means, and the offset web sections are conducted past the transfer printing station in common in juxtaposed position. In the first pass of the web past the transfer printing location, image and text elements are printed with a first color; in the second pass of the web with offset, image and text elements are printed with the second color.
The printer means 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 or an LED line, is employed as intermediate carrier. 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 printing unit in which a corona device, arranged at a distance from the photoconductor, transfers the toner image onto the endless carrier material passing through between photoconductor and corona device with an electrical field. To this end, the air between the corona device and the endless carrier material is ionized by high field strengths, as a result whereof charge carriers are generated on that side of the endless carrier material facing away from the photoconductor. An electrostatic force field thereby arises between endless carrier material and photoconductor, as a result whereof the toner image situated on the photoconductor is transferred onto
REFERENCES:
patent: 3578970 (1971-05-01), Michaud et al.
patent: 3827799 (1974-08-01), Koizumi
patent: 4208666 (1980-06-01), Paranjpe
patent: 5337131 (1994-08-01), Sagiv et al.
patent: 5539508 (1996-07-01), Piotrowski et al.
patent: 5546178 (1996-08-01), Manzer et al.
patent: 5568245 (1996-10-01), Ferber et al.
Patent Abstracts of Japan Publication No. JP4174480, dated Jun. 22, 1992 (Takeshi).
Patent Abstracts of Japan Publication No. JP58172667, dated Oct. 11, 1983 (Kazuhiro).
Heinz John
Kopp Walter
Olbrich Otto
Beatty Robert
Oce Printing Systems GmbH
LandOfFree
Electrographic printer with adjustable corona device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrographic printer with adjustable corona device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrographic printer with adjustable corona device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1336118