Electrophotographic printing device

US7123867B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Bernd Schultheis · Bad Kreuznach, DE
• Birgit Lattermann · Sulingen, DE
• Dieter Jung · Daaden, DE

Key dates

• Filing date: Oct 6, 2001
• Grant date: Oct 17, 2006
• Expiry date: Oct 6, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G2215/1609
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An electrophotographic printing device with a developer unit and a photoconductor. The photoconductor is either directly connected to a substrate to be printed in the region of a transfer zone, or is connected by an intermediate circuit of one or several transfer media. At least one charger is provided for the substrate and the substrate may be transported through the transfer zone by a transport device. According to this invention, an effective transfer of toner to the substrate surface can be achieved with such an arrangement, even with a poor electrically-conducting and thick-walled, sheet-like substrate, whereby a charger is arranged as the primary charger in the transport direction and a secondary charger is arranged in the region after the transfer zone and both primary and secondary chargers affect the surface of the substrate to be printed.