Oce Printing Systems Gmbh

Other

Oc&eacute; Printing Systems Gmbh

Océ´ Printing Systems Gmbh & Co. Kg

Volkhard Maess

Martin Schleusener

Martin Berg

Hans Winter

Uwe Höllig

Wolfgang Schullerus

Peter Schulmeister

Alfred Zollner

Heinrich Lay

Thomas Montag

Christian Scholz

Georg Landmesser

Bernhard Hochwind

Ralf Selinger

Hans-Detlef Groeger

Ulrich Bäumler

Josef Schreieder

Edward Morris

Andreas Wirtz

Matthias Fromm

Peter Möstl

Rüdiger Hauns

Michael Mayr

Thomas Schimidt-Behounek

In a method or a transfer station for a digital printer, liquid developer with toner particles can be directed towards a first side of a recording medium and onto the first side of the recording medium at a transfer point. A transfer roller can be configured to direct the liquid developer towards the recording medium. The toner particles can have a first polarity and the recording medium can move past the transfer roller along a transport direction. A layer of charged particles can be applied from a second side of the recording medium by a surface charging station. The surface charging station can be arranged before the transfer point in the transport direction. The second side of the recording medium can be opposite the first side. The charged particles can have a second polarity that is opposite the first polarity.

Transfer station for a liquid toner printing system

In a system or method for development of potential images of images to be printed and generated on an intermediate image carrier using a developer fluid comprising charged toner particles and developer fluid in an electrographic printing or copying device, a feed device is provided comprising as function elements at least one chamber scraper, a raster element comprising cups to receiver the developer fluid, and at least one first flow element arranged in the chamber scraper. Between the at least one flow element and the raster element an electrical voltage is supplied such that a toner particle concentration in the cups of the raster element is increased. An application device accepts the developer fluid from the feed device and supplies it to the intermediate image carrier.

Apparatus and method for development of potential images, produced on an intermediate image carrier, for an electrographic printing or copying device

In an electrographic printing device, an image generating system generates an electrical charge image on an image carrier element. The electronic charge image is made visible by a developer station via charged ink particles, the image being subsequently transferred onto a final image medium and fixed thereon. A speed control is provided which: continuously varies speed of the image carrier element from zero up to a limit speed; adapts charge intensity of the image carrier element to its speed; adapts an exposure intensity for exposure according to the image and in a deletion exposure of the image carrier element to its speed; and keeps a supply of toner to the image carrier element constant per area.

Device and method for electrophoretic liquid development

In a method or device for transport of liquid developer to an image carrier element for electrophoretic digital printing, a developer unit is arranged adjacent to the image carrier element, the developer unit directing a liquid developer having toner particles to the image carrier element, the toner particles crossing over to the image carrier element corresponding to previously-generated potential images. A raster unit is arranged adjacent to the developer unit. The raster unit transports the liquid developer to the developer unit by use of a raster. An electrical voltage is applied between the raster unit and the developer unit in order to exert a targeted field effect on the toner particles in a direction towards the developer unit. A chamber scraper having a dosing scraper is arranged adjacent to the raster unit and having liquid developer having the toner particles which are already charged. From the chamber scraper the raster unit accepts the liquid developer via the dosing scraper. The chamber scraper is arranged and operable such that the dosing scraper is washed over by the liquid developer.

In a method and system for setting toner concentration of a toner particle-carrier particle mixture in a developer station for development of a latent charge image on a carrier, a sensor is arranged in the developer station measuring the toner concentration. Toner feed in the developer station is adjusted. A current consumption value is determined for toner particles. From the toner concentration measured with the sensor and from the toner consumption value, a toner concentration is calculated at a location in the developer station at which the toner is extracted. A calculated toner concentration at the toner extraction location is input as a control variable used to adjust toner feed so that the calculated toner concentration approaches a desired value.

Method and device for setting the toner concentration in the developer station of an electrophotographic printer or copier

The invention relates to a method and devices for cleaning the surfaces of applicator rollers, photoconductor drums, transfer belts, and photoconductor belts using magnetic roller systems. The invention also relates to methods and systems for cleaning magnetic rollers to whose surfaces toner particles adhere. In a first embodiment, a squeegee/scraper is disposed at a distance to the surface of the roller. In another embodiment, a magnetic stator configuration with two spaced apart magnetic elements is used whose poles have substantially the same active direction.

Method and device for cleaning support elements in printers or copiers by means of magnetic fields

A method and device controls a printer or copier to generate a plurality of marks that are assembled into a coherent marking band that is then inked by the toner. A sensor measures the marking band. The printer or copier are controlled based on the output of the sensor.

Method for controlling a printer or copier using a toner mark band and reflex sensor working according to the triangulation principle

In a device and method for electrographic printing or copying, a latent image carrier is provided having a potential pattern corresponding to an image pattern. An applicator pattern is provided that carries a liquid layer of ink spaced from a surface of the latent image carrier by an air gap. A surface of the applicator element is provided with a structure with which detachment of droplets from the liquid layer is facilitated, the structure having a plurality of first areas having an increased electrical conductivity, a plurality of second areas that differ from a remaining surface based on a portion of surface energy, and a plurality of third areas formed as microscopic elevations. A force field is applied in the air gap to act on the liquid layer. By overcoming the air gap, droplets are transferred from the liquid layer on the surface of the latent image carrier by overcoming the air gap for inking a latent image to create an inked image.

Device and method for electrographically printing or copying using liquid inks

In a method and device to control a print process in a printer or copier, with a character generator generating a latent print image and a latent toner marking on an image carrier. An exposure energy per unit area for the generation of the latent toner marking is decreased in comparison to an energy per unit area for generation of the latent print image. The latent print image and the latent toner marking are developed with toner in the developer station. An optical reflection sensor determines color density of the developed toner marking. Toner concentration is adjusted in a developer station dependent on a signal of the reflection sensor.

Method and device for controlling a print process with high color density

The invention relates to a method for operating an electrophotographic printing device (). A multilevel character generator () is used in said printing device (). Correction parameters (KKK) are determined for light coding values (1, 2 and 3) such that a high-quality printed image can he obtained also in the instance of modified printing conditions.

Printing device which operates with at least three brightness steps and methods to be executed therewith for determining printing parameters

A device for cleaning an image carrier of residuals of an ink image, in which for inking the latent image on a latent image carrier, droplets are transferred from a liquid layer onto the surface of the latent image carrier by overcoming an air gap. The cleaning device is arranged at the circumference of the image carrier and removing the residual ink remaining after transfer of the image inked with a liquid ink is removed from the surface of the image carrier.

Device and method for cleaning and for regenerating an image carrier during electrographic printing or copying by using liquid ink

A method for operating a printer or copier in which at least one optical or mechanical attribute of the printed image support to be printed is detected using a sensor (steps ). At least one printing parameter is given according to the sensor output signals (steps ). The printed image support is then printed while using the printing parameters detected in such a manner.

Printing methods which are dependent on attributes of the printed image support and corresponding printing devices

There is described an applicator element for providing a layer of a liquid ink, in particular for inking a latent image carrier of a device for electrographic printing or copying, the surface of the applicator element having a structure with a plurality of areas at which the detachment of droplets from the liquid layer is facilitated.

Applicator element and method for electrographic printing or copying using liquid coloring agents

A method for operating an electrographic printer or copier includes determining an adapted exposure energy before the start of the printing process. To this end, a portion of the image elements on a charged photoconductor region is exposed to a predetermined exposure energy. The other portion of the image elements on the photoconductor region is not exposed. A raster parameter which takes the ratio between exposed and unexposed image elements into account is used during the determination of the adapted exposure energy. A printer or copier apparatus for carrying out the method is also provided.

Method for the improved electrographic printing of image details and printing device which operates according to this method

A method in which a multilevel character generator ( ) is adjusted using a single correction factor (KF) during an automatic compensation operation such that high-quality printed images can be obtained also in the instance of modified printing conditions.

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Pliening, Germany

Volkhard Maess