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BIAS SWITCHOVER IN THE EVENT OF ELECTROMETER FAILURE

IP.com Disclosure Number: IPCOM000023472D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31

Publishing Venue

Xerox Disclosure Journal

Abstract

To protect against failure of an electrometer (2) used to regulate the bias applied to the developing roll or rolls (3) of an electrostatic type copier (4) , a manual bypass switch (5) is provided in parallel with the electrometer (2) The bypass switch (5) , when closed, couples the source (6) of voltage potential directly to the developing brush (3) A voltage dropping resistor (7) is used in the bypass line (8) to provide a predetermined bypass potential to the developing brush on closure of the bypass switch.