the level of the contour of revolution 49 the guide plates 45 46 are connected to the holder 34 1 35 1 through webs 50 51 and bars 52 53 as a sheet 22 is pulled off the sheet supporting surfaces of the holders 34 or 35 by the tongs type gripper system 21 of the turning drum 15 the respective guide surface 47 48 prevents the end of the sheet from entering into the channel 30 or 31 fig3 shows guide plates 54 55 which are each fixed to a bar 56 57 connected to the holders 34 2 35 2 the guide surfaces 47 48 formed with the guide plates 54 55 likewise rise from the interior of the channels 30 31 to the level of the contour of revolution 49 in a variant according to fig4 guide devices each including a pair of interacting guide plates 56 1 56 2 and 57 1 57 2 are provided the guide plates 56 1 56 2 and 57 1 57 2 are fixed to the holders 35 2 34 1 and 34 2 35 1 by respective bars 58 61 if during a format setting the holders 34 1 34.