Abstract: A flexible latent image-bearing photoconductive element is driven through a U-shaped path to form a self-contained electrographic developer reservoir to which electrically conductive toner particles are supplied. A grounded, electrically conductive, apertured member positioned in the toner reservoir in close proximity to the image-bearing surface of the photoconductor imparts continuous motion to the toner particles as the image-bearing element moves therepast. The motion creates a sweeping action which reduces the amount of toner background present in a finished print.

Abstract: A relief printing process utilizes a low relief printing form which is inked with a pressure transferable, non-liquid marking material prior to each printing impact. The printing form comprises a support layer on which there is deposited, in an imagewise pattern, a monolayer of uniformly sized granular developing particles within the range of about 25 to about 150 microns in diameter. The printing form can be prepared by a variety of colloid-transfer or electrostatic techniques.