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1. (WO2009124980) METHOD FOR DETERMINING THE DETERIORATION OF A DEVELOPER MIXTURE USED IN A DEVELOPER STATION FOR DEVELOPING CHARGE IMAGES, IN AN ELECTROGRAPHIC PRINTING APPLIANCE

Pub. No.:    WO/2009/124980    International Application No.:    PCT/EP2009/054256
Publication Date: Oct 15, 2009 International Filing Date: Apr 8, 2009
IPC: G03G 15/08
Applicants: OCÉ PRINTING SYSTEMS GMBH
SCHWARZ-KOCK, Thomas
DORFNER, Ralph
Inventors: SCHWARZ-KOCK, Thomas
DORFNER, Ralph
Title: METHOD FOR DETERMINING THE DETERIORATION OF A DEVELOPER MIXTURE USED IN A DEVELOPER STATION FOR DEVELOPING CHARGE IMAGES, IN AN ELECTROGRAPHIC PRINTING APPLIANCE
Abstract:
The developer mixture (GE) is guided past the developer roller (2) in the developer station (ES), via a cleaning roller (3) which is used to clean the remaining toner off the developer roller (2). As a result of an electric field between the developer roller (2) and the cleaning roller (3), a cleaning roller current (IWR) flows between the developer roller (2) and the cleaning roller (3) when a developer mixture is moved through the electric field (E). Said current is measured as an actual value (Ist-IRW). The difference between the actual value (Ist-IRW) and a pre-determined nominal value (Soll-IRW) is determined, said difference representing a measure for the deterioration of the developer mixture (GE).