Abstract: A blower arrangement for detachment of a metallized belt from a sheet and for creating a braking force on a sheet, which belt and sheet are situated between platens of a press in a machine for printing sheet elements which comprises a bar arrangement near the exit of the press in which is provided a series of nozzles having the form of flattened parallelpipeds, each of these nozzles being sealed by a translational mobile cylindrical valve member movable perpendicular to an air supply duct with the valve member having a communication passage. The plane of the jets coming from the nozzles is directed approximately horizontally between the metallized belt and the sheet.