Container labeling machine

A container labeling machine comprising conveyance means for conveying containers to be labeled along an advancement path and at least one labeling station arranged along said advancement path of the containers, said labeling station comprising an unwinding assembly for a labeling ribbon wound in a spool and a cutting drum, which is designed to receive, so that it adheres to the external lateral surface thereof, said labeling ribbon fed by said unwinding assembly and which supports at least one cutting device which can be activated, by virtue of actuation means, in order to cut labels to be transferred to said containers, said at least one cutting device comprising a respective suction chamber, which is open at an external lateral surface of said cutting drum and accommodates at least one blade, said suction chamber being connectable with air suction means in order to apply to said labeling ribbon an action of attraction toward the inside of said suction chamber and push said labeling ribbon against said blade, in order to result in said labeling ribbon being cut, and further comprising a diagnostic device for diagnosing a correct operation of said at least one cutting device, said diagnostic device being provided with detection means for detecting at least one parameter correlated with pressure present in said suction chamber.