Abstract: A delivery fly arrangement for use with a folder of a printing press comprising a plurality of delivery fly wheel units mounted on a horizontally extending fly shaft journalled in a pair of frames in such a manner that they may be displaced axially on and along the fly shaft and rotated as the fly shaft is rotated; a displacement/driving system for displacing these delivery fly wheel units axially on and along the fly shaft, this displacement/driving system including a positional detector, a memory section, a control section, and an input/output section; and connecting rods, plates and arms which allow the delivery fly wheel units to rotate with the rotation of the fly shaft and which operatively connect these delivery fly wheel units to the displacement/driving system.