Burns, Doane, Swecker & Mathis
Developing apparatus with color dependent toner supply voltage
 An electrophotographic copying apparatus includes a main body, a developing system, removably mounted on the main body, provided with a developing device having the developing sleeve holding a carrier on the outer surface, and a toner cartridge having a toner supply roller which confronts the developing sleeve. A voltage-adjusting device adjusts the bias voltage to be supplied respectively to the developing sleeve and the toner supply roller depending on a toner color so as to generate a predetermined electric potential between the developing sleeve and the toner supply roller. The voltage adjusting device adjusts the bias voltage difference between the developing sleeve and the toner supply roller according to a saturation charge amount which is different depending on the toner color. 
Minolta Camera Kabushiki Kaisha
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inventional inventional inventional inventional
Akihito Kouichi Hiroshi Hiroshi
Ikegawa Etou Mizuno Murasaki