Abstract: A machine processing printing-material sheets contains a first sheet transport drum and a second sheet transport drum disposed immediately after the first sheet transport drum in a sheet transport direction. The first sheet transport drum has gripper systems which describe a gripper flight circle during its rotation and a drum profile deviating substantially from a circular shape with outer contour regions running between the gripper systems and set back from the gripper flight circle. The second sheet transport drum has a sheet support surface with pneumatic grooves formed therein. The sheet support surface is composed of a first and second comb segments each with segment prongs. The pneumatic grooves are introduced into the segment prongs of at least one of the comb segments. The pneumatic grooves are preferably introduced both into the segment prongs of the first comb segment and into the segment prongs of the second comb segment.

Abstract: A machine processing printing-material sheets contains a first sheet transport drum and a second sheet transport drum disposed immediately after the first sheet transport drum in a sheet transport direction. The first sheet transport drum has gripper systems which describe a gripper flight circle during its rotation and a drum profile deviating substantially from a circular shape with outer contour regions running between the gripper systems and set back from the gripper flight circle. The second sheet transport drum has a sheet support surface with pneumatic grooves formed therein. The sheet support surface is composed of a first and second comb segments each with segment prongs. The pneumatic grooves are introduced into the segment prongs of at least one of the comb segments. The pneumatic grooves are preferably introduced both into the segment prongs of the first comb segment and into the segment prongs of the second comb segment.

Abstract: A delivery of a machine for processing flat printing materials, having a sheet guide surface over which the sheets are drawn during operation, with forcible guidance of an edge of the sheets extending in a processing direction, respectively, includes nozzles opening into the sheet guide surface and providing flow therethrough during operation, and a blown air curtain, formed during operation, which extends over the sheet guide surface transversely with respect to the processing direction and is aimed at a target region on the sheet guide surface. The nozzles are arranged on the sheet guide surface in accordance with a first mode and a second mode, the nozzles arranged in accordance with a first of the modes outputting during operation a flow which counteracts a volume flow, from the blown air curtain, which is deflected downline with respect to the processing direction.

Abstract: A guiding device of a machine for processing planar print carriers, the guiding device having a guide surface, over and beyond which sheets are drawn, during operation, simultaneously with positive guidance by a margin of the sheets, which, respectively, extends in a direction of sheet travel, and having nozzles terminating in the guide surface, for conducting therethrough, during operation, a flow of air for forming an air cushion between the guide surface and the respective sheet, comprising a region with a closed surface located on the guide surface, on the path of the print carrier along the guide surface, said region being disposed opposite a respective margin of a processable one of the print carriers of varying format, the margin extending laterally with respect to the direction of sheet travel.

Abstract: A method for preventing limit values from being exceeded in sheet-fed printing machines includes acquiring values relevant to the printing process with respect to individual sheets, and processing those values so that predetermined limit values are maintained, detecting the development trend of a relevant value in the course of a series of sheets, and initiating measures when a change in the values occurs that would lead to a limit value being exceeded in an additional predetermined number of sheets if a continuation of the trend occurs; and a device for performing the method.

Abstract: A device for separating or singling sheets, which have been piled up to form a stack, in a feeder of a sheet-processing machine, having a transport element with a guide edge, includes a device for matching the shape of the guide edge to the contour of the topmost sheet at a front side of the stack, as viewed in a sheet transport direction.

Abstract: A method for preventing limit values from being exceeded in sheet-fed printing machines includes acquiring values relevant to the printing process with respect to individual sheets, and processing those values so that predetermined limit values are maintained, detecting the development trend of a relevant value in the course of a series of sheets, and initiating measures when a change in the values occurs that would lead to a limit value being exceeded in an additional predetermined number of sheets if a continuation of the trend occurs; and a device for performing the method.

Abstract: A device for separating or singling sheets, which have been piled up to form a stack, in a feeder of a sheet-processing machine, having a transport element with a guide edge, includes a device for matching the shape of the guide edge to the contour of the topmost sheet at a front side of the stack, as viewed in a sheet transport direction.

Abstract: A delivery of a machine for processing flat printing materials, having a sheet guide surface over which the sheets are drawn during operation, with forcible guidance of an edge of the sheets extending in a processing direction, respectively, includes nozzles opening into the sheet guide surface and providing flow therethrough during operation, and a blown air curtain, formed during operation, which extends over the sheet guide surface transversely with respect to the processing direction and is aimed at a target region on the sheet guide surface. The nozzles are arranged on the sheet guide surface in accordance with a first mode and a second mode, the nozzles arranged in accordance with a first of the modes outputting during operation a flow which counteracts a volume flow, from the blown air curtain, which is deflected downline with respect to the processing direction.

Abstract: A guiding device of a machine for processing planar print carriers, the guiding device having a guide surface, over and beyond which sheets are drawn, during operation, simultaneously with positive guidance by a margin of the sheets, which, respectively, extends in a direction of sheet travel, and having nozzles terminating in the guide surface, for conducting therethrough, during operation, a flow of air for forming an air cushion between the guide surface and the respective sheet, comprising a region with a closed surface located on the guide surface, on the path of the print carrier along the guide surface, said region being disposed opposite a respective margin of a processable one of the print carriers of varying format, the margin extending laterally with respect to the direction of sheet travel.

Abstract: A method for detecting the position of stacked flat material wherein at least one light beam is directed onto a side of a pile of the flat material, is reflected therefrom and is evaluated as a measure of the position, includes directing the at least one light beam not only onto the side of the flat material pile, but also onto a region above a top edge of the pile, and utilizing regions with reflection and without reflection from the pile side for determining the position of the top edge of the pile; and a device for performing the foregoing method.

Abstract: A device for damping bending vibrations in a printing-unit cylinder of a rotary printing press includes at least one damper disposed in a printing-unit cylinder and tunable to a wide-band frequency, the damper having at least one member with a natural frequency corresponding to a natural frequency of the printing-unit cylinder, and a device for supporting the damper member so that the damper member is deflected in phase opposition to a deflection of the printing-unit cylinder.

Abstract: The invention relates to a printing unit cylinder for a rotary printing machine comprising a gap strip arranged in a cylinder gap of said printing unit cylinder, said gap strip being supported on the bottom of said cylinder gap, being removably fastened via a fastening means and being of resilient design in order to achieve a reliable vibration absorption in the area of the cylinder gaps.