Converting machine with height adjustment

A flexographic printing unit for a converting machine, the flexographic printing unit comprising:

• a flexographic printing assembly including a printing cylinder, an anilox cylinder, a counter cylinder, and a doctor blade chamber, the printing cylinder being arranged vertically above the counter cylinder and configured to print on a top side of a sheet,
• wherein the flexographic printing unit comprises a fixed frame portion and a movable frame portion, and wherein the printing cylinder, the anilox cylinder, and the doctor blade chamber are attached to the movable frame portion and the counter cylinder is attached to the fixed frame portion, the movable frame portion being vertically movable between an operating position where the printing cylinder is positioned against the counter cylinder and a service position where the printing cylinder is further distanced from the counter cylinder,
• wherein the movable frame portion forms a cassette together with the printing cylinder, the anilox cylinder, and the doctor blade chamber,
• wherein the movable frame portion comprises a first side bracket and a second side bracket, and wherein the first and second side brackets are slidably connected to a first and second side frame portions of the fixed frame portion, respectively,
• wherein the first side bracket and the second side bracket are connected to a displacement mechanism comprising a first actuator and a second actuator operationally connected to at least one motor, and wherein the displacement mechanism is configured to move the cassette between the operating position and the service position, wherein the first actuator comprises a first converter and the second actuator comprises a second converter, the converters being operationally connected to the at least one motor via a first and second rotatable vertical drive shafts, respectively,
• wherein the converters each comprises a bearing and a rotating shaft, and wherein a first end of a first rotating shaft is received in the first bearing and a first end of the second rotating shaft is received in the second bearing,
• and wherein the converters are configured to transform an angular displacement of the rotating shafts into a linear and vertical displacement of the cassette.