Automatic rotary machine for the continuous dry-offset printing up to 4 colours on the flat top side of plastic caps. Control of all machine functions and accessories installed, by a PLC with digital Bus Field system. Productivity up to 2.500 or 5.000 ppm according to the configuration of the line. The machine is also available in the version equipped with a Pre-Print unit for the decoration of a base colour background and with quality inspection systems.