ELECTROSTATOGRAPHIC PROCESSING SYSTEM

摘要

An electrostatographic processing system for obtaining enhanced copy quality in which transfer to a support material is effected by a corona generator (48) having an electrode (81) and the developer mixture includes toner particles having a particle size distribution with a median diameter by volume of about 12 microns with not more than 8% preferably 1 to 5% by volume of the particles having a diameter greater than 20 microns and not more than 20%, preferably 0.5 to 13.5%, by number of the particles having a diameter less than 5 microns. For best results the ratio of toner content to carrier is such that there is a solid area reflection optical density of fixed images of about 1.3. Further improvement in copy quality is achieved by also including a bias transfer roll (40) at the transfer station and by utilizing a fuser having a pressure roll in contact with a conformable heated fuser roll.