Abstract: A sheet diverter, adapted for cooperative association with a cutter in a pinless folder assembly for a high speed printing press, wherein a ribbon is cut into a plurality of signatures destined for serially deflected parallel collation from a diverter path through the sheet diverter to a desired one of a plurality of collation paths to systematize the order of the signatures into a selected array, is comprised of an oscillating diverter guide member reciprocating in a diverter plane having a component generally normal to the diverter path of a signature through the guide member, for directing the lateral disposition of the leading edge of the signature into engagement with a diverter member separating a plurality of collation paths, each having a throat for receiving a selected signature and merging to a confined course for guiding it, the diverter member including a diversion surface disposed in each of the throats lying at a diversion angle respecting the travel of the signature from the oscillating guide m