Abstract: An apparatus for automatically washing printing units of printing machines with finely perforated rollers, which includes: a hollow body that constitutes the washing water chamber and is anchored laterally and parallel to the color feed tube and has, at its base, a series of nozzles, which are directed towards the inside of the wedge-shaped suction chamber, and a series of similar nozzles which are directed towards the rear part of the suction chamber. A series of nozzles is associated with the color feed tube to direct the color towards the secondary rotating roller and to feed the washing water into the finely perforated roller when printing ends. The apparatus is also provided with wear-preventing pads between the rotating secondary roller and the suction chamber, with pads for axially retaining the secondary roller, and with a device for washing under pressure the opposite ends of the color feed tube, the tubular ends of the washing chamber, and the rings of the finely perforated roller.

Abstract: A rotary cylindrical-screen printing apparatus for specularly printing equal patterns and/or colors onto the opposite faces of a fabric is disclosed, comprising two rotary screen printing machines, each equipped with electromechanical means for synchronizing the speed of the belt with the speed of the printing rollers, in which said machines are coupled by arranging one machine over the other, the fabric entering the underlying machine and thereafter entering the second upper machine which prints the opposite face of the fabric, the second machine comprising a transmission roller associated with its belt having a diameter equal to at least twice the diameter of the contiguous roller of the first machine, the apparatus comprising means for synchronizing the speeds of the printing rollers of two machines, including a transducer linked to the speed of the belt of a machine, whose outgoing frequency signal is sent to pilot the electrohydraulic motors controlling the printing rollers of both machines and means for