A rotary printing machine comprising two supporting shoulders, a central drum or cylinder being rotatably mounted on the supporting shoulders, at least one printing unit being arranged around the drum and comprising a printing plate cylinder and an anilox roller, which are rotatably mounted on a respective pair of supporting elements and whose rotation axis is parallel to the axis of the drum, wherein at least the central drum is actuated by a source of motion which directly engages an axial shank of the drum.
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