Sheet transfer cylinder for sheet-fed rotary printing machines convertible between first form and perfector printing

Abstract

Sheet transfer cylinder for a sheet-fed rotary printing machine convertible between first form and perfector printing having a gripper device for gripping the leading edge of a sheet and a suction device for gripping the trailing edge of the sheet and tightening and smoothing the sheet in travel direction thereof through the machine and transversely to the travel direction including first control means including at least one circumferential cam for controlling circumferential sheet-tightening movement, second control means including lateral cams for controlling lateral sheet-tightening movement, the suction device having parts thereof disposed side-by-side in axial direction of the cylinder and formed with suction holes, and transmission means operatively connecting the first and the second control means with the parts of the suction device so as to superimpose actions thereon for applying a diagonal tightening force to the sheet, the first and the second control means being independent of one another.

Dependencies are inferred from the claim text.