Electrophotographic printing apparatus where the toner image is transferred to the underside of a paper sheet and where the paper sheet is guided from a transfer station (B) to a fixing unit entrance (A), by a grid plate to which the paper sheet adheres owing to suction means (10), the grid plate forming a guiding surface extending from the transfer station towards the fixing unit entrance, and diverging from the plane defined by the transfer station and the fixing unit entrance of an angle such that the path followed by the paper from the transfer station to the entrance of the fixing unit is slighty greater than their distance, whereby allowance is provided for paper contractions and undersired paper tensioning is prevented.