Oce Printing Systems Gmbh

Other

Oc&eacute; Printing Systems Gmbh

Océ´ Printing Systems Gmbh & Co. Kg

Martin Schleusener

Volkhard Maess

Martin Berg

Reinhard Apel

Walter Kopp

Manfred Wiedemer

Uwe Höllig

Edward Morris

Jean-Philippe Hulin

Manfred Muenz

Vokhard Maess

In a method or system for generation of a toner image layer with a preset layer thickness on a surface of a photoconductor, the two-component mixture of electrically charged toner particles and carrier particles is directed on an auto-surface of a roller adjacent a surface of an applicator element to be inked. At least a portion of the toner particles is transferred onto the surface of the applicator element. An electrical field is generated that exerts at least one force on a portion of the electrically charged toner particles between the roller and the applicator element. A strength of the electrical field is varied to adjust a layer thickness of a layer of the toner particles transferred onto the surface of the applicator element and thus to adjust a thickness of the toner image layer on the photoconductor. A measurement arrangement detects a thickness of at least one region of the toner image layer inked on the surface of the photoconductor as a real value. The determined real value is compared with a desired value determined by a preset layer thickness, and a strength of the electrical field is controlled dependent on a deviation of the determined real value from the desired value.

Method and arrangement for inking up an applicator element of an electrophotographic printer or copier

In a method or system for printing of a recording medium, potential images are generated on a potential image carrier. A developer liquid is used that comprises a transparent photo-polymerizable carrier liquid and charged colorant particles. The developer is transported via an applicator roller to the potential image carrier to form a developer film in a developing zone. The developer film adjacent to the potential image carrier comprises the photo-polymerizable carrier liquid enriched with the colorant particles in regions in which potential images are present on the potential image carrier and said photo-polymerizable liquid substantially depleted of said colorant particles in regions in which no potential images are present. The developer film splits at an end of the developing zone into an image film adhering to the potential image carrier comprising the developed potential image and a film adhering to the applicator roller comprising the photo-polymerizable liquid with residual colorant particles. The image film with the developed potential images is transferred from the potential image carrier onto the recording medium such that the colorant particles and a portion of the photo-polymerizable liquid in which the colorant particles are arranged migrates from the image film. The image film is fixed on the recording medium with a radiation such that the colorant particles of the developed potential images are embedded in a solid, transparent polymer mass via photo-polymerization, and otherwise the photo-polymerizable liquid is solidified into a transparent film.

Method for imprinting a recording medium

In a method or system where inking in an electrophotographic printer or copier, a magnetic roller is provided having a rotatable magnetic roller sleeve having a circumferential surface to which a two-component mixture comprising toner particles and ferro-magnetic carrier particles adheres. An applicator element has a circumferential surface to be inked with toner particles and past which the two-component mixture adhering to the circumferential surface of the magnetic roller is guided to produce a toner layer on the applicator element. The magnetic roller has a magnetic rotor which comprises magnetic elements and arranged inside the magnetic roller sleeve. A magnetic rotor and the magnetic roller sleeve are moveable relative to one another.

Arrangement and method for inking an applicator element of an electrophotographic printer or copier

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.

The invention relates to a method according to which print data determine the image elements of a printing format to be printed on a substrate. According to the inventive method, the surface tension of a printing liquid () is influenced depending on the printing date that pertains to the respective image element.

Method and printer device for transferring printing fluid onto a carrier material as well as appertaining printing drum

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

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.

Method for printing by using a multilevel character generator and printing device

A device and method for inking a charge pattern of a carrier medium. The device includes a toner sprayer that generates and directs a mixed toner stream onto a surface of an application element. The mixed toner stream includes a number of charge toner and air particles and forms a toner layer when the mixed toner stream contacts the application element surface. The application element is movably positioned in close proximity to the carrier medium for transferring the charged toner particles onto the charge pattern of the carrier medium for inking the same.

Device and method for inking a charge pattern using a toner spraying device

A multicolor printer uses toner of two polarities applied on a photo conductor layer prior to the two toners being applied to a carrier. The photo conductor layer is provided with an image-wise illumination with regions of different illumination to form regions of different potentials. The regions of different potentials are developed by applying the toner of two polarities. Further colors of toner may be used, provided illumination with corresponding different illumination and provided charging of the photo conductor layer to change relative potentials is performed. An overall illumination of the photo conductor layer between developing steps changes potential levels on regions not covered by toner but not in areas covered by toner.

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Namborn, Germany

Martin Schleusener