A printing machine includes: a frame a tower which is driven in rotation relative to the frame in order to move an object to be printed between at least a printing station, an introduction station and/or discharge station; a conveyor which is capable of introducing or discharging the object to be printed to/from the introduction station and/or discharge station; a transfer device including a conveyor web portion which is capable of moving the object to be printed between the conveyor and the tower. The machine includes an element for driving the conveyor web portion of the transfer device, the drive element being carried by the frame, each transfer device including a transmission element which can be disengaged from the drive element.