Abstract: A turning unit for sheet-like substrates has at least one first turning element with a basic body having an outer, round substrate contact surface for deflecting the substrate. The deflection is from a first sheet conveying direction to a second sheet conveying direction describing a predetermined angle to the first sheet conveying direction. Furthermore, a channel structure is provided that is formed in the substrate contact surface and onto which open a plurality of gas outlet openings which are in fluid communication with a gas supply.

Abstract: A simple and cost-effective safety against electromagnetic radiation in housings, wherein a housing shield for shielding against electromagnetic radiation for intermediate spaces of a housing including housing parts, has an electrically conducting spiral coiled spring that is arranged on the intermediate spaces to be shielded and extends between the housing parts.