JPS5581376A - Transfer method and device in electrophotography - Google Patents

Abstract

PURPOSE:To make image-forming processes simpler by specifying the construction of transfer roller. CONSTITUTION:A transfer roller 9 is constituted by a metal core 92 to which negative bias voltage is applied and a conductive rubber roller 91 surrounding the outside circumference thereof. If with this arrangement transfer paper P is pressed by way of the transfer roller 9 onto the photoreceptor 1 formed by the two color developed images by the positively-charged two-component type black toner and the one-component type red toner deposited by the dielectric polarization, these having been developed by the 1st, 2nd developing devices 7, 8, then the positively charged black toner deposted on the black-part-corresponding-latent image parts is attracted to the transfer paper P and the one-component type red toner transfers to the transfer paper P as the polarized positive charges by the negative voltage of the transfer roller 9 is applied, thus the good two color images are obtainable through one transfer.