APPAREIL DE XEROGRAPHIE

A xerographic copier is an improvement or principal invention RPR No. 76005 and is equipped with a toner dosing unit and an illuminating sub-assembly. The unit contains a toner holder with nozzles placed on a (surface) generating line. The container rotates around its axis, being actuated by an axle pressed through a bush with a helical groove on its inner side being located in the drum. The axle is coupled to a core which moves in rotating and translational mode, while dosing the drum. The movement is by a peg moving in the helical groove, developed in the bush in the drum's interior. The reliability of the apparatus is enhanced by a conical gear coupled to a pressure plate, the couple can be displaced axially to an extent needed to balance the photographing-developing camera. The displacement is transmitted to an axle driving a cam. The coupling of the conical gear and the pressure plate is achieved by an elastic ring of low friction, polyurethane for instance.