Sheet-fed rotary printing machine with printing units arranged in tandem

Sheet-fed rotary offset printing machine having printing units arranged in tandem for processing both paper as well as cardboard with single-side multicolor or, first form and perfector printing and having at least one sheet-turning device, each of the printing units having four cylinders consisting, in addition to a plate and a blanket cylinder of given diameter, of an impression cylinder and a transfer cylinder each having at least double the diameter of the respective plate and blanket cylinders, comprising a base frame located between two of the printing units and carrying only two cylinders consisting of a transfer cylinder and a storage cylinder, each having a diameter double that of the respective plate and blanket cylinders, the one of said two printing units located downstream of said base frame in travel direction of a sheet through the printing machine having a transfer cylinder in the for of a sheet-turning cylinder with respective rows of tongs-grippers disposed 180.degree. from one another around the circumference thereof, said base frame and said one of said two printing units together constituting a sheet-turning device, the transfer cylinder of said one of said two printing units forming part of said sheet-turning device having a diameter double the diameter of the respective plate and blanket cylinder, and the transfer cylinders of all of the other printing units of the printing machine having respective diameters triple the diameter of the respective plate and blanket cylinders, the impression cylinder of said one of said two printing units being in cooperative engagement with said turning cylinder and having hook grippers thereon for taking over a sheet from said tongs grippers of said tuning cylinder, and means disposed on the impression and turning cylinder as well as the transfer and storage cylinders for transporting the sheet smudge-free with the printed surface thereof facing radially inwardly on the cylinders.