Single-component developing station

US6055402A · kind A · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Uwe Angst · Jockgrim, DE
• Carsten Schoenfeld · Reilingen, DE
• Gerhard Bartscher · Cologne, DE
• Steve Cormier
• Kenneth D. Fraser · Calgary, CA
• Anton Rodi · Leimen, DE

Key dates

• Filing date: Jul 6, 1998
• Grant date: Apr 25, 2000
• Expiry date: Jul 6, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G2215/0617
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

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.