The present invention relates to a printing machine comprising a rotary impression drum (4) cooled by water supporting a substrate (S), printing groups (5) and drying groups (6); a water distribution device (7); a first air circulation device (8) associated with said drying groups (6); a drying tunnel (10) for drying the printed substrate (S) and a second air circulation device (11) associated with said drying tunnel (10), said water distribution device (7), said first and second air circulation devices (8, 11) and said drying tunnel (10) being arranged in an upper platform with respect to said print unit (3), and distributed such that a passageway (19) enabling an operator to access said devices is defined between same, access means having been provided for accessing said upper passageway (19).