Patent ID: 6466764
Filing Date: 2002-10-15
Classification: G03G

Abstract:
An electrophotographic printing apparatus comprising:(1) a laser printing device for creating a latent image on a photoconductor drum whose outside surface defines a first side of a toner transfer zone; (2) a transfer roller whose outside surface defines a second side of the toner transfer zone; (3) a roller type heat pressure device having a first mode of operation for pretreating successive sheets and a second mode of operation for fixing toner to said sheets; (4) a first sheet transport system that leads through the roller type heat/pressure device while it is in the first mode of operation and then to a sheet duplexing tray; (5) a sheet duplexing tray for receiving sheets from the heat/pressure device and subsequently transferring said sheets to a second sheet transport system; (6) the second sheet transport system leads from the sheet duplexing tray to the toner transfer zone and turns the sheet over; and (7) a third sheet transport system that leads from the toner transfer zone back through the heat/pressure device in the second mode of operation and then out of said printing apparatus.