Heidelberger Druckmaschinen Ag

Gerhard Bartscher

Anton Rodi

Patrick Metzler

Christian Compera

Kenneth D Fraser

Uwe Angst

Walter Dworschak

Steve Cormier

Carsten Schoenfeld

A device for developing an electrostatic latent image located on a movable image carrier, the developing device having a toner feeder for feeding toner particles from a toner reservoir and for electrically charging the particles, and a rotatably mounted developing roller having a surface for accepting the charged toner particles, includes a device spaced from the surface of the developing roller for generating an alternating electric field actable upon the toner particles; and a method for operating the developing device.

Device for creating a uniform toner layer by electrically charging toner particles

A device for conveying thin workpieces in a machine used in printing technology, which device includes at least one moving conveying element, on whose surface are formed areas of changing charge density, the adherence of the workpiece on the conveying element being supported by electrostatic forces wherein contacts are provided for forming the areas of changing charge density, the contacts touching the conveying element and being connected to at least one voltage source, and an electric current flow being present, via the contacts in the material of the conveying element.

Device for conveying sheets in a printing machine

A device and a method for developing an electrostatic latent image, which is located on a movable image carrier (1), using a non-conductive single-component toner. The device includes a toner feed device (3), in order to transport toner particles (5) from a toner reservoir (4) and charge them electrically, a rotationally mounted developing roller (2) to receive the charged toner particles from the toner feed device and to transport the toner particles which it holds into a gap between the developing roller and the image carrier, and a rotationally mounted doctor roller (6), which is arranged in the path of the toner particles from the toner feed device to the developing roller, to produce a uniform toner layer with a defined thickness on the developing roller. The surface of the developing roller (2) and the surface of the doctor roller (6) are separated from one another by a gap which is wider than the average diameter of the toner particles (5). In this manner, electrographic printing with high quality and at high speed is made possible.

Single-component developing station

A printing machine for creating an image through the use of toner particles. the printing machine having a development device for preparing the toner, and the development device having at least one filter for selecting toner particles.

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Kiel, Germany

Gerhard Bartscher