Abstract: A sheet guiding device for a printing press, includes guide surface members having slit nozzles for emitting blast air. The slit nozzles are aimed in a direction crosswise to a sheet travel path for tautening sheets traveling in the printing operation.

Abstract: A sheet transport cylinder in a machine that processes sheets of printing material includes air nozzles for sheet formats of the printing-material sheets. The printing-material sheets are dimensioned from a minimum format up to a maximum format. The sheet transport cylinder is distinguished by the fact that the air nozzles are throttled air nozzles disposed to be matched to the minimum format.

Abstract: An air cushion guide for sheet or web-formed material that includes at least one guide member having a chamber and a surface formed with nozzle openings that may communicate with the chamber, through which air is blown between the guide member and the guided material for supporting the guided material on a supporting air cushion located above the guide member. Each of the nozzle openings has a cross sectional area. At least one moveable element is constructed to vary a volumetric flow of air emitted from the nozzle openings to form the air cushion guide. The moveable element is selected from the group consisting of a component having a movement which changes a number of the nozzle openings formed in the surface that are supplied with blown air, and at least one component having a movement that changes the cross sectional area of at least one of the nozzle openings formed in the surface. A control unit is provided for controlling a movement of the at least one moveable element.

Abstract: In a device for guiding sheets in a sheet-fed apparatus, preferably, a rotary printing press, sheet guide elements that are charged with blasted air are disposed at the sheet guide cylinder, and the air blast nozzles include a combination of conventional free jet nozzles and throttled nozzles, which are independently charged with different pressure levels.

Abstract: An air cushion guide for sheet or web-formed material that includes at least one guide member having a chamber and a surface formed with nozzle openings that may communicate with the chamber, through which air is blown between the guide member and the guided material for supporting the guided material on a supporting air cushion located above the guide member. Each of the nozzle openings has a cross sectional area. At least one moveable element is constructed to vary a volumetric flow of air emitted from the nozzle openings to form the air cushion guide. The moveable element is selected from the group consisting of a component having a movement which changes a number of the nozzle openings formed in the surface that are supplied with blown air, and at least one component having a movement that changes the cross sectional area of at least one of the nozzle openings formed in the surface. A control unit is provided for controlling a movement of the at least one moveable element.

Abstract: A sheet-fed rotary printing press having at least one unit including an impression cylinder and an additional cylinder assigned to the impression cylinder, the impression cylinder and the additional cylinder being relatively adjustable a spaced distance from one another, includes a sheet guiding device disposed on the additional cylinder for keeping sheets of printing material, which have been transported by the impression cylinder past the additional cylinder, away from the additional cylinder, once the spaced distance between the impression cylinder and the additional cylinder has been set.

Abstract: A device for reducing the noise emissions of a machine for printing flat material, wherein flat material is transportable across an impression cylinder, comprising at least one muffling element disposed across a portion of a transport path of the flat material extending along the impression cylinder, directly behind or downline from a nip, as viewed in the direction of the transport path, and at a spaced distance from the impression cylinder; and a machine including the device.

Abstract: A sheet-fed rotary printing machine has a plurality of units arranged in tandem, at least one of the units including a first cylinder for transporting a sheet and a second cylinder disposed opposite the first cylinder, the first cylinder and the second cylinder being mounted so as to be disengageable from one another; the second cylinder being stoppable and having a device by which an outer portion of the second cylinder is displaceable; and a method of transporting a sheet through a unit of the printing machine.

Abstract: An air cushion guide for sheet or web-formed material includes at least one guide member formed with nozzle openings through which air is blown between the guide member and the guided material for supporting the guide material on a supporting air cushion located above the guide member, at least one of two variables consisting of volumetric air flow emerging from the nozzles and flow speed between the guide member and the guided material being adjustable independently of one another so that a proportionality between the two variables is nullified or neutralized; and a method of adjusting a flotation height.

Abstract: A method of adjusting an air guide system having various actuators, in a sheet-fed printing machine, includes the method steps of providing characteristic curves containing conveying parameters which are critical for sheet conveyance, plotted against a printing machine-specific parameter, and which are optimal for sheet-specific parameters; storing the characteristic curves in a memory; feeding the actual sheet-specific and printing machine-specific data of a print job to a CPU; accessing by the CPU the characteristic curve which is optimal for the actual data from the memory; outputting the appropriate commands to the individual actuators; and, if necessary, providing operator intervention; and a device for performing the method.

Abstract: A method for adjusting a cylinder in a printing machine includes, in a first step, rotating a first cylinder into a rotary position wherein a cylinder gap formed in the first cylinder is directed towards a second cylinder of the printing machine and, in a second step, displacing one of the two cylinders, with the second cylinder dipping into the cylinder gap; and a printing machine for performing the method.

Abstract: A turning device for a printing press, wherein a sheet printed on one side thereof is acceptable from an impression cylinder of an upline printing unit and is transferable to an impression cylinder of a downline printing unit, includes a first gripper device for accepting the sheet by a leading edge thereof from the upline impression cylinder, a register cylinder formed with a multiplicity of suction openings distributed over a circumferential surface thereof and being communicable with a negative pressure source for holding the sheet by suction and for guiding the sheet in-register with a leading edge thereof in the lead, the sheet, while being guided in-register, being held solely by the suction openings, and a second gripper device for accepting the sheet from the register cylinder at a trailing edge of the sheet.

Abstract: A device for contact-free sheet guidance in a sheet-fed printing press, having a sheet guiding surface and an air guiding surface directed obliquely away from the sheet guiding surface, includes at least one blast air nozzle disposed in the sheet guiding surface and having a cross section formed as a ring slot sector having a center of curvature located within an opening of the blast air nozzle formed in the plane of the sheet guiding surface.

Abstract: In a sheet-fed printing press, a contact-free sheet guiding device having a sheet guiding surface is provided including at least one blast air nozzle disposed in the sheet guiding surface and having an air guiding surface directed obliquely downwardly with respect to the sheet guiding surface, the air guiding surface defining a cross section of the blast air nozzle disposed obliquely downwardly from the sheet guiding surface, the blast air nozzle being disposed so that a flow direction of blast air emerging from the blast air nozzle encloses, with the sheet guiding surface, a steep angle directed against the sheet from below, the blast air flow having a vertical directional component which is greater than a horizontal directional component thereof.

Abstract: A contact-free sheet guidance device in a sheet-fed printing press, having a sheet guiding surface, includes at least one blast air nozzle formed in the sheet guiding surface and having a cross section directed obliquely downwardly with respect to the sheet guiding surface, the sheet guiding surface being formed with an opening for an air outlet directed substantially vertically at a sheet being fed in the sheet travel direction, the air outlet opening being disposed upstream of the blast air nozzle in the sheet travel direction and being smaller in cross section than the cross section of the blast air nozzle.

Abstract: Sheet guiding device for a printing press having a guide surface member for guiding sheets includes blast air or suction nozzles provided in the guide surface member, the guide surface member being formed, as viewed in a sheet transport direction, successively of an entry region, a guide zone and an exit region, the nozzles provided in at least one of the entry and the exit regions of the guide surface member being suppliable selectively with suction or blast air in accordance with a type of printing material or stock to be processed, and the nozzles provided in the guide zone disposed between the entry region and the exit region of the guide surface member being suppliable with blast air, at least some of the nozzles being disposed so as to emit blast air substantially tangentially to a guide surface of the guide surface member.

Abstract: A sheet-guiding system for a printing press, the sheet-guiding system being disposed in the vicinity of a transfer drum located between two sheet-guiding cylinders, respectively, disposed upstream and downstream of the transfer drum, as viewed in a sheet travel direction, the transfer drum being provided with rows of grippers movable along a travel path and having at least nearly closed surfaces between the rows of grippers, including an air guide element disposed above the transfer drum at a slight spacing from the travel path of the gripper rows, the air guide element defining an air chamber at the top thereof, the air chamber extending from the upstream to the downstream sheet-guiding cylinder, and a blower device for applying air to the air chamber in a direction towards the downstream sheet-guiding cylinder.

Abstract: Method for braking sheets in a delivery of a sheet-fed rotary printing press wherein the sheets are disposed in tandem and are successively fed to a sheet-pile position in translatory travel direction, the sheets being in an overlapping shingled arrangement in a vicinity of a sheet brake, an air-blast jet being applied beneath and parallel to the respective sheets, includes feeding the sheet to the sheet brake by means of gripper closure and a flotation-guiding arrangement, forming with the air-blast jet a carrying-air flow for producing the flotation-guiding arrangement and for simultaneously separating the sheets from an instant at which the sheets are being formed into the overlapping shingled arrangement, the carrying-air flow formed beneath an oncoming sheet continuing in the vicinity of the overlapping shingled arrangement of the sheets for forming an elongation of the flotation-guiding arrangement towards the delivery; and a device for performing the method.

Abstract: Method for pneumatically braking sheets in a delivery of a sheet-fed rotary printing press by means of blast air directed opposite to a sheet-transport direction for forming an air flow for braking the sheet includes adjusting the air flow for braking the sheet to a state of equilibrium between energy of the air flow acting upon the sheet and kinetic energy of the sheet, the sheet being carried in the region of a braking path in a contact-free manner by the air flow, and device for performing the method.

Abstract: A device in a printing press for applying air flow to printing stock being transferred by a transfer drum to an impression cylinder so as to achieve a flawless application of the printing stock on the impression cylinder before the printing stock reaches a printing nip defined by the impression cylinder and a blanket cylinder of the printing press includes a flat air-guide element extending over the breadth of the impression cylinder from a vicinity of the circumference of the transfer drum to as far as possible in a direction towards the printing nip so as to form a wedge-shaped space having a tip extending towards the printing nip.