A single-pass color electrophotographic printer includes four imaging stations, yellow, cyan, magenta, and black, on a generally linear path. A toned image in each toner color is developed on an image bearing member or photoconductive drum. A plurality of electrically biased first transfer rollers associated...http://www.google.com.hk/patents/US6681094?utm_source=gb-gplus-share專利 US6681094 - Intermediate transfer member belt/roller configuration for single-pass color electrophotographic printer
