Abstract: A printing unit with removable printing cylinder, comprising two outer shoulders which are adapted to constitute a supporting frame for a printing cylinder, a first pair of arms and a second pair of arms which are pivoted at an upper end of each one of the shoulders and form a seat for accommodating the printing cylinder, elements for locking the printing cylinder being provided in order to retain the printing cylinder so that it rests on the first and second pairs of arms.

Abstract: A printing unit with more easily removable components, comprising two outer shoulders, which are adapted to support a printing cylinder, and two inner shoulders, which are pivoted to the outer shoulders so as to pass from an open position to a closed active printing position, the pair of inner shoulders supporting an inking cylinder, a tray which is suitable to contain the ink and is arranged below the inking cylinder, and a cylinder bearing the type, the closure position of the two inner shoulders being such as to move the cylinder bearing the type into abutment against the printing cylinder in order to perform printing and such as to move the inking cylinder into abutment against the cylinder bearing the type.