Patent ID: 7966931

Claim:
A sheet-fed offset printing press for double-sided multi-color printing, comprising: a first row of in-line printing units for printing on a first side of a sheet; a downstream reversing device following said first row of in-line printing units in a sheet travel direction; a second row of in-line printing units for printing a second side of the sheet disposed downstream of said reversing device, said second row of in-line printing units including a last printing unit; downstream varnishing units including at least two varnishing units of a common type following said last printing unit and configured to varnish the first side and the second side of the sheet on passing by, wherein one of said varnishing units is disposed below a sheet travel path followed by the sheet, at least two of said varnishing units being disposed for defining a nip between varnishing blanket cylinders thereof, and wherein sheets to be varnished on both sides are guided through said nip; and at least two IR or hot-air dryers, said dryers including at least one dryer disposed below the sheet travel path; gripper bars disposed for conveying sheets to be varnished on both sides through the nip between said two varnishing blanket cylinders; a multiple-diameter transport drum having a diameter being a multiple of a diameter of a form cylinder of said printing units, said gripper bars forming a part of said drum and said drum being open in a region of a sheet surface and containing a varnishing unit inside said drum.