Oce Printing Systems Gmbh

Ralf Selinger

Uwe Höllig

Admir Lela

Stefan Niederhofer

Volkhard Maess

Peter Schulmeister

Robert Link

Florian Köfferlein

Uwe Huellig

In a method to remove toner deposits on a surface of a cleaning element, electrically charged toner particles are transferred from a transfer element surface to a photoconductor. On the cleaning element, untransferred, electrically charged toner particles as residual toner from the transfer element surface are received. Electrically charged toner particles on the cleaning element are directed past an electrode arrangement arranged at a distance from the surface of the cleaning element. An alternating electrical field is generated which acts on the toner particles to loosen them. The toner particles remaining on the surface of the cleaning element are brought into contact with a mixture of carrier particles and toner particles during further transport along a transport direction of the cleaning element.

Apparatus and method for removing toner deposits from the surface of a cleaning element

In a developer station for a printer or copier, a rotating developer roller is provided having a mixture of toner particles and ferromagnetic carrier particles accumulated on a surface of the developer roller as a layer, and a transfer zone at which the toner particles are transferred away from the developer roller. A smoothing device is provided with a smoothing element arranged before the transfer zone, the smoothing element being charged with a mechanical tension in a rest state of the developer roller and designed such that it exerts a force on and over an entire width of the layer formed by the mixture of the toner particles and the carrier particles present on the developer roller and smoothes the layer before the transfer of the toner particles. Within the developer roller at least one magnet is provided. The smoothing element comprises a magnetizable material attracted toward said at least one magnet to create said mechanical tension.

Developer station with smoothing device and method for operating a developer station

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

In a device and method for developing a charge image on a photoconductor of an electrophotographic printer or copier, a developer chamber is provided having a first and a second end in which at least a portion of the developer is contained. A mixer is provided for thoroughly mixing the developer in the developer chamber. The mixer generates a flow of the developer that is directed from a first end of the developer chamber to a second end. An inlet for developer is provided at the first end of the developer chamber and an overflow is provided at the second end. The developer exits the developer chamber via the overflow when its level in the region of the second end exceeds a prescribed height. A conveyor conveys the developer that has exited the developer chamber at the overflow toward the inlet.

Device and method for developing a charge image

In a device and method for lifting magnetizable carrier particles from a mixture of toner particles, a cover of a collecting element interface device is arranged such that it can be rotated around a stator with a magnet. The cover comprises a spiral that, given rotation of the cover, conveys the carrier particles in an axial direction.

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Munich, Germany

Ralf Selinger