Folding jaw cylinder

A folding jaw cylinder assembly in a folder of a printing machine, said folding jaw cylinder assembly comprising:

• a hollow rotatable shaft supporting said folding jaw cylinder assembly in said printing machine;
• at least a first set of cooperating folding jaws carried by said folding jaw cylinder, said at least first set of cooperating folding jaws having a plurality of movable folding jaws carried on a folding jaw shaft and a plurality of stationary folding jaws carried on a folding jaw bar, said movable folding jaws and said stationary folding jaws in said at least first set of cooperating folding jaws being spaced at an adjustable folding jaw operating distance from each other;
• a first pair of spaced support disks rotatably supported on said hollow shaft and receiving spaced ends of said folding jaw shaft;
• a second pair of spaced support disks rotatably supported on said hollow shaft and receiving spaced ends of said folding jaw bar;
• a first adjusting support extending between said first pair of spaced support disks and a second adjusting support extending between said second pair of spaced support disks;
• a first threaded borehole in said first adjusting support and a second threaded borehole in said second adjusting support;
• a rotatable adjusting spindle supported by said hollow shaft and having a first end received in said first threaded borehole in said first adjusting support and a second end received in said second threaded borehole in said second adjusting support;
• means for sensing a thickness of a paper ribbon to be folded by said folded jaw cylinder;
• and
• means for rotating said adjusting spindle to move said first and second adjusting supports with respect to each other to vary the spacing between said movable folding jaws and said stationary folding jaws to adjust said adjustable folding jaw operating distance in response to said sensed thickness of said paper ribbon.