Patent ID: 6285850
Filing Date: 2001-09-04
Classification: G03G

Abstract:
A multi-color duplex printer comprising:a first transfer surface drive device for driving a first transfer surface carrying a first multi-color toner particle image to a first transfer station at which said first multi-color toner particle image is transferred to one face of a substrate web;a second transfer surface drive device for driving a second transfer surface carrying a second multi-color toner particle image on said second transfer surface to a second transfer station at which said second multi-color toner particle image is transferred to the opposite face of said substrate web;a web drive device for driving said substrate web through said first and second transfer stations;a first transfer surface movement sensor for sensing movement of said first transfer surface;a second transfer surface movement sensor for sensing movement of said second transfer surface; anda control device for controlling said first, and second transfer surface drive devices and said web drive device in response to signals received from said first and second transfer surface movement sensors thereby to ensure desired registration between said first and second multiple toner images at a desired location on said substrate web.