The present invention relates to a printing unit (200), the printing unit (200) comprises at least one frame (283), the frame (283) has at least two side walls (271), the side walls of the (271) during extending at least partially conveyance path configured for conveyance of the printed products (02), the conveying path set with respect to the conveyance of the substrate (02), at least one conveying direction are defined, the printing unit (200), at least two, includes a crossbeam (272) spaced from one another in the conveying direction, crossbeams (272), one from the side wall of the respective side wall (271) (271 extending to the other), each of the at least two crossbeams (272), at least one first transverse support (611), at least one of the first cross member (611) And a second lateral support spaced Luo interval (612), I first support (611) a second lateral support and (612) are coupled with each crossbeam (272 at least one inner chamber of), defining the direction opposite to the at least partially and the conveying direction in the conveying direction, in each of the at least one inner chamber, at least one component of the gas conveyor, and / or at least one print head (221) at least one additional device for supplying energy and / or production raw materials and / or printing fluid and / or data and / or at least one gas (247; 263; 601; 602; 603; 604; 607; 608), and / or at least one print head (221) at least one of and / or cover to and / or maintenance to clean the Side of the additional device (247; 263; 601; 602; 603; 604; 607; 608) is disposed, the printing unit (200), at least one relatively least 1 with respect to the frame (283) one of comprising a separating direction (C) to the movable support body (616), the support body (616) extends between the side walls (271) at least the lateral direction (a), at least one print head (221) but be disposed on at least one supporting body (616) is movable with at least one supporting body (616).