Abstract: A duplex printer apparatus utilizing non-contact printing devices in the form of a Direct Electrostatic Printer (DEP). Simplex images are formed on one side of an intermediate in the form of a belt using one or more DEP printing devices. A substrate such as plain paper is superimposed on the images formed on the intermediate. Continued movement of the belt in its endless path effects passage of the substrate past different DEP printing devices for forming images on the other side of the substrate.

Abstract: A charging device provided with an integral arrangement for tensioning coronodes. The charging device is useful for mounting a double length prefabricated wire coronode having a predetermined length, and provided with coronode connectors at each end. The device includes first and second insulating end blocks supporting the coronode in charging position with respect to a surface to be charged, at least one of the end blocks adaptable for electrically connecting the coronode to a power supply, a coronode support member supported on the first end block for supporting a looped end of the coronode at the first end block and a coronode tensioning arrangement on the second end block, for applying tension to the coronode, including a pivot member for supporting the free ends of the coronode and mounted for pivoting movement between first and second positions.