Abstract: Disclosed is an apparatus for developing electrophotographic copying materials which eliminates the damage to flexible copying materials encountered with conventional developing apparatus. This apparatus comprises a pair of feed rollers for applying toner dispersion to the copying material, a guide plate for supporting the copying material within the apparatus, a distributor element for the toner dispersion which acts as a counter-electrode, means for adjustably positioning the distributor element in parallel relation above the guide plate, and a pair of squeegee rollers for removing excess toner dispersion from the copying material.

Abstract: A process and apparatus for developing a latent electrostatic image on an electrophotographic copying material by means of a toner dispersion. An infeed roller applies the toner dispersion to the copying material, and, downstream thereof, a distribution roller acts on the surface of the copying material. To solve the problem of reproducing fine white indicia, such as thin white lines, on a black background, a voltage, having the same polarity as the surface charge of the latent electrostatic image on the copying material, is applied to the distribution roller. Squeegee rollers downstream of the distribution roller effect removal of unused toner. Toner, which adheres to the distribution roller during application of voltage to the distribution roller, is sprayed off and recovered for recycling, the spraying agent being toner dispersion.

Abstract: An improved apparatus is disclosed for developing images on an electrophotographic copy sheet, characterized by the provision of a distribution roller having a soft porous peripheral surface for evenly spreading the toner dispersion on the electrophotographic copy sheet. The distribution roller is arranged between pairs of in-feed and squeeze roller means arranged in the developing chamber for transporting the electrophotographic sheet therethrough. Improved spray tube means are also provided for spraying the toner dispersion uniformly upon the peripheral surface of the upper in-feed roller.