Charge and bias control system for electrophotographiccopier

Abstract From the Canadian patent

A charge and bias control system for a liquiddeveloper electrophotographic copier in which a sensing electrode is disposed in the developing station just upstream of the developing electrodes. Developer liquid fills the space between the sensing electrode and the photoconductor to provide a direct coupling between the two elements. The charge level is adjusted at the beginning of each copy cycle by supplying the control input of the charge-corona power supply with a ramp derived by periodically indexing a counter concurrently with the movement of the photoconductor. When the photoconductor surface potential as, measured by the sensing electrode, reaches a predetermined level, further …