ELECTROGRAPHIC RECORDING

Case 04-4241-U.S. APPLICATION OF ROGER D. ERICKSON ELECTROGRAPHIC RECORDING An electrographic recording system includes means wherein toner powder having electrical and magnetic properties is carried from a hopper to a recording station by a rotatable drum or shell. The shell is rotated about a magnetic core structure which produces a magnetic field to hold the toner powder onto the surface of the shell as it rotates. At the recording station, a dynamic bridge is formed of the toner powder between the periphery of the drum and a magnetically permeable member positioned a predetermined distance from the surface of the drum. A record member is driven along a path between the drum and the permeable member with the reverse side of the record member in contact with the permeable member. An array of recording electrodes are positioned to be in electrical contact with the toner powder in the bridge. The record member is backed up by an electrically conductive platen. When one or more of the electrodes is energized a conductive path is established from the electrode through the bridge to the surface of the recording member and the conductive backup plate, electrically charging the dielectric surface of the recording member to deposit toner thereon.