Abstract: The cleaning device for the drum-shaped intermediate image carrier of an electrophoretic printer is used in the field of technical data processing in order to improve the quality of the electrophoretically printed color images. The toner suspensions of different color used must be removed from the intermediate image carrier and must be separately applied to separate collecting reservoirs, one of which is provided for each toner suspension color. To this end, a ruler-shaped upper edge (5, 11) of an air duct (21) forms a narrow gap in conjunction with the intermediate image carrier (1). Therethrough air is forced in order to ensure that the toner suspension flows from the intermediate image carrier to a collecting reservoir (8) via a wiper (6) and a chute (7) of the cleaning device associated with each toner suspension. The chutes can be displaced so that accurate separation of the suspensions is ensured and each suspension is applied to the associated reservoir.

Abstract: In order to prevent clogging of the nozzle and to ensure that the intermediate image carrier (8) is uniformly wetted with toner suspension across its entire width directly at the beginning of the printing operation, the nozzle comprises a front chamber (3) which extends across the entire width of the intermediate image carrier (8). Toner suspension enters said front chamber and subsequently reaches, via narrow bores (4), an open rear chamber (5) which is filled with suspension as far as an overflow edge (6). At the beginning of the operation, the suspension flows over the edge (6), across an inclined surface (7) in order to be applied to the intermediate image carrier (8) in a film of given thickness. The thickness of the suspension film is determined by a gap (10) which is formed by the nozzle and the intermediate image carrier (8). The nozzle has a flat shape, so that several nozzles can be arranged over one another.

Abstract: A method of liquid development of charge images formed on a surface of a tape-like record carrier, for example by an electrostatic printer. The record carrier is simultaneously sprayed with developer liquid in two flows which are directed towards each other. As a result, two separate, uniform and oppositely directed flow zones meeting at one common turbulent flow zone are obtained. Both during pre-development and final developement the charge images are brought into contact with a large quantity of fresh developer liquid.

Abstract: An electrode stylus which is arranged in an aperture of a rotatable printing roller is secured in a cylindrical insert of the roller by means of an electrode holder. The electrode holder comprises a constriction in the center, so that it is sub-divided into an adjusting portion which supports the electrode and which can be slightly bent, by means of adjusting screws, transversely of the jacket surface of the roller, and a fixing portion which can be fixed in an aperture in the insert by means of a fixing screw. The adjustment of the height of the stylus is effected, after the loosening of the fixing screw, by an arm which can be inserted into the insert and which is radially pivotable therein relative to the roller axis. Microscopic adjustment of the electrode stylus in the tangential as well as the radial direction relative to the roller is thus possible.