Printing machines and parts for printing machines, in particular printing presses, web-fed presses, machines for printing labels, machines for printing packaging; punching presses; machines for folding and for gluing boxes, as well as offset printing groups for printing presses, flexographic printing groups for printing presses, gravure printing groups for printing presses, screen printing groups for printing presses, cutting-out groups for printing presses, and printing groups for stamping for printing presses