Paper sheet guiding cylinder for a printing machine

In a printing machine having side frames and a printing machine drive, a paper sheet guiding cylinder assembly comprising:

• a paper sheet guiding cylinder being mounted in the side frames of the printing machine and being drivingly connected to the printing machine drive;
• said paper sheet guiding cylinder having an axis;
• said paper sheet guiding cylinder including a cylinder jacket and side walls with through holes formed therein;
• said paper sheet guiding cylinder housing a rotatably mounted radial ventilator being coaxial with the axis of said paper sheet guiding cylinder for supplying blowing air into said paper sheet guiding cylinder and for deflecting the blowing air inside said paper sheet guiding cylinder towards said cylinder jacket, said radial ventilator communicating with the ambient air through said holes, and said radial ventilator having ventilator blades disposed concentrically about the axis of said paper sheet guiding cylinder and extending along the paper sheet guiding cylinder;
• and
• means being independent of said paper sheet guiding cylinder for driving said radial ventilator with adjustable speed.