Patent ID: 6603945
Filing Date: 2003-08-05
Classification: G03G

Abstract:
A duplex/simplex printer for producing toner particle images on opposite sides of a substrate during a duplex mode or producing toner particle image on one side of the substrate during a simplex mode comprising:means for forming a first image on an imaging member with marking particles electrostatically charged to a first polarity; an image conditioner, being enable only during said duplex mode, for reversing the charge polarity of the particles of said first image on the imaging member; an intermediate member for receiving of said first image during said duplex mode; a bias transfer roll, positioned opposed from said imaging member with the intermediate member therebetween, for transferring said first image to said intermediate member by moving the intermediate member and the imaging member past said bias transfer roll being charged at said first polarity during said duplex mode, said duplex mode includes said forming means forming a second image on said imaging member with marking particles electrostatically charged to the first polarity and means for feeding the substrate between said intermediate member and said imaging member and a controller for reversing the charge polarity of said bias transfer roll to a second polarity thereby simultaneously transfer charged particles of said first and second images to opposite sides of said substrate during said duplex mode.