Patent ID: 6021302
Filing Date: 2000-02-01
Classification: G03G

Abstract:
An apparatus for transferring a plurality of toner images from a member to a sheet, each of said toner images having a respective first charge for transferring each of said toner images from said member to said sheet, and said sheet having a first side in contact with said member and a second side facing away from said member, said apparatus comprising:means for moving said sheet along a path in synchronism with said membera transfer device for applying a respective second charge corresponding to each of said toner images to said second side of said sheet, said second charge having a polarity opposite to that of said first charge such that successive ones of said toner images are transferred from said member to said first side of the said sheet in superimposed registration with each other;a charge generating device, located facing said first side of said sheet and after said transfer device along said path of movement of said sheet at a position where said sheet becomes separated from said member, for applying a third charge having the same polarity as said first charge on said transferred toner images on said first side of said sheet; andgrounding means, located facing said second side of said sheet and opposite said charge generating device, for electrically grounding said second side of said sheet, said charge generating device and said grounding means being arranged for increasing the charge of said transferred toner images on said first side of said sheet so as to minimize back transfer of said transferred toner images from said sheet to said member in a subsequent transfer station.