Abstract: A device is described for developing a latent electrostatic image which is present on a surface, for example a photoconductor surface. The device has one or more regions of a first type having relatively large dimensions and one or more regions of a second type having relatively small dimensions, both dimensions being measured parallel to the direction of relative movement of the device with respect to the image surface.The regions described may be separately and independently supplied with electric potentials.A method is described for developing a latent electrostatic image with use of a device according to the invention whereby energizing of the first and second type regions is carried out in accordance with developer-density and/or contrast requirements.

Abstract: Apparatus for transferring a toner image from a photoconductive coating to a print sheet (which is fixed on a drum) using an intermediate transfer sheet. A pair of axially parallel electrically polarized rollers are placed between the one side of photoconductor surface and the drum. A print sheet is mounted on the drum and a transfer sheet is mounted on the drum over the print sheet. The free end of the transfer sheet is fixed. The transfer sheet is rolled over the toned photoconductor surface in a first direction. A return movement is effected. The polarization is such that the toner is retained on the photoconductor surface during the first movement and during the return movement, the transfer sheet is wound on the drum with the top roller polarized to transfer the toner from the photoconductor to the transfer sheet. The bottom roller cooperates with the drum surface and is electrically polarized to retain the toner on the transfer sheet.

Abstract: A method and apparatus for electrophotographically forming a multi-color proof print using at least two color separations. Two toner images of different color are formed in registration with each other. The photoconductive coating for each toner image is charged to an identical final charge state. Development of the charge pattern on each color separation is commenced after correspondingly identical time periods.