Photocopying – Contact printing – Light boxes
Patent
1990-11-26
1993-03-02
Grimley, A. T.
Photocopying
Contact printing
Light boxes
162271, G03G 1520
Patent
active
051913798
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a non-mechanical printer or copier means having an intermediate carrier on which latent images of characters to be printed are generated dependent on print information and are developed into toner images with the assistance of a developer mix; a transfer printing station in which these toner images are transferred onto a recording medium; and a fixing means for fixing the toner images on the recording medium, the fixing means being composed of a motor-driven fixing drum and of a pressure roller that form a fixing nip for the recording medium, wherein the fixing drum and/or the pressure roller are heated.
Non-mechanical printers or copier means that work according to the electrostatic principle are generally known and have been successfully employed. In these means, toner images of the characters to be printed are generated on a recording medium, for example, on a paper web. This can occur, for example, in that electrophotographic or electrographic charge images are generated on a photoconductive, dielectric recording material, for example a drum. These charge images are developed in a developing station with the assistance of what are usually two-component toners composed of the actual toner particles forming the color and of ferromagnetic carrier particles. The images are then transferred in a transfer station onto an image-receiving material as an ultimate recording medium. In order to make the toner images smear-proof, they must subsequently be fused into the recording medium in a fixing station.
Fixing stations with which the toner images are fused into the recording medium are already known (U.S. Pat. No. 3,861,863). In these known fixing means, the recording medium passes through between two fixing drums whereof at least one is heated and these fixing drums forming a fixing gap. The fixing drums can therefore also be preceded by a means in the form of what is referred to as a pre-heating saddle for heating the recording medium.
In the fixing gap, the recording medium is heated under high pressing power to a temperature of, typically, 100.degree. C. through 120.degree. C. and the toner particles are thereby fused into the recording medium. In combination with this stressing, the curvature remaining in the recording medium is greatly dependent on the geometry of the paper guide immediately after departing the fixing gap. A curvature or arcing of the recording medium leads to increased conveying problems over the further course of the recording medium path. Particularly in the case of a duplex operation of the printer means wherein both-sided printing of the recording medium is possible, increased stripping problems derive therefrom at the electrophotographic intermediate image carrier and allocation deviations derive between the printing information and the recording medium. Moreover, there is the risk, on the one hand, of the non-uniform acceptance of the recording medium by further conveyor rollers, as a result whereof a crumpling risk cannot be made impossible, and, on the other hand, the stacking behavior is greatly deteriorated by a curvature of the recording media.
In duplex operation in such electrophotographic printers (page printers), the single sheet taken from a supply bin is first printed on its front side in the printing channel of the printer means, is then returned via a return channel into the input of the printing channel and is turned over in a turning means situated there. After being re-supplied into the printing channel, the back side of the single sheet is then printed. After this, the single sheet is deposited in an output bin via an output channel.
In order to maintain a continuous printing operation given a constant printing process speed, one or more sheets are continuously supplied to the printing channel and to the return means. The control of the printer then assigns the corresponding print image to the corresponding front, or respectively, back sides of the single sheet. The proper sequence in the output or, respectively, deposit is guaranteed
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Klapettek Gerhard
Manzer Hans
Seeberger Rudolf
Grimley A. T.
Ramirez Nestor R.
Siemens Aktiengesellschaft
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