Abstract: An impression cylinder of a sheet-fed offset printing machine for first form and perfector printing has a multiple diameter and includes a dressing disposed on an outer cylindrical surface thereof for carrying a sheet on a previously printed side thereof, the dressing including a foil having a textured surface for supporting the sheet and having a construction for adjusting to and compensating for inequalities of the impression cylinder, the foil being replaceably fastened on the outer cylindrical surface at least at a sheet carrying region thereof.

Abstract: A suction head for a feeder of a sheet-fed rotary printing press for feeding sheets of small format through the press in a given direction, including only one double sucker formed of two juxtaposed suction nozzles connected by a transverse tube and being disposed transversely to the feeding direction of the sheets, the only one double sucker being exchangeably secured at a center location of the printing press.

Abstract: Rotary printing press for two-sided printing of sheets having a first and a second printing unit, respectively including an impression cylinder, the press including a sheet feeder having a device for separating sheets singly from a feeder pile and a device for feeding the singly separated sheets to the first printing unit for printing one of the sides of the respective sheets and to the second printing unit for printing the other of the sides of the respective sheets, a delivery system having a device for conveying and depositing the sheets on at least one delivery pile and including a disconnectable delivery, a control device for controlling operational sequences performed in the rotary printing press, the first and second printing units being satellite printing units disposed as mirror images in tandem horizontally and, respectively, having a plurality of printing devices arranged around each of the respective impression cylinders thereof, the sheet feeder and the disconnectable delivery being assigned to t

Abstract: Rotary printing press for two-sided printing of sheets having a first and a second printing unit, respectively including an impression cylinder, the press having a sheet feeder with a device for separating sheets singly from a feeder pile and a device for feeding the singly separated sheets to the first printing unit for printing one of the sides of the respective sheets, a device for conveying the sheets to the second printing unit for printing the other of the sides of the respective sheets and through the entire printing press, a delivery having a device for conveying and depositing the sheets on a delivery pile, and a control device for controlling operational sequences performed in the rotary printing press, the first and second printing units being satellite printing units disposed in tandem horizontally and, respectively, having a plurality of printing devices arranged around each of the respective impression cylinders thereof, the sheet feeder and the delivery being disposed between the first and seco

Abstract: Sheet delivery of a printing machine having a gripper system running on an endless conveyor includes air containers located adjacent the endless conveyor and being formed with a sheet-wide field of air-outlet openings, the gripper system including grippers for gripping a sheet of printing material at a leading edge thereof so that the sheet is floatingly conveyable by the endless conveyor over the sheet-wide field of air-outlet openings formed in the air containers, the endless conveyor having a capability of turning the sheet and depositing it on a sheet pile, at least one of the air containers extending over the sheet width and having air-outlet openings of varying shapes formed so that air is discharged therefrom in different directions, the one air container being chargeable with blowing air regulatable in accordance with specific requirements of the printing material of the sheet.

Abstract: Foil for covering an impression cylinder of a rotary offset printing press for first-form and perfector printing is formed of a chemically and wear-resistant rigid support layer having good ink transfer behavior and having a structured surface with statistically uniformly distributed convex and concave structural elements thereon, and a microroughness-reducing chromium layer disposed on the rigid support layer and forming a sheet-guiding outer cylindrical surface of the impression cylinder, respective peaks being formed on the convex structural elements for supporting a sheet thereon, each of the convex structural elements having an oval shape with a radius of curvature increasing from the respective peak thereof to a transition into respective concave structural elements adjacent thereto.

Abstract: A sheet-fed rotary printing machine having printing units for processing sheets with single-side multicolor or first form and perfector printing, a feeder for feeding the sheets to the printing units, and a preceding sheet processing unit located upstream of the printing units as viewed in sheet-feeding direction in the printing machine, also has a work and tumble device including a sheet turning device disposed in the sheet-feeding direction between the preceding sheet processing unit and the printing units for the first form and perfector printing.

Abstract: A sheet-fed rotary offset printing press having a plurality of in-line conventionally mass-produced printing units with plate and blanket cylinders of given unitary diameter and sheet-guiding cylinders having respective diameters which are a multiple of the given unitary diameter, mechanically acting gripper systems carried by the sheet-guiding cylinders for in-line transfer of sheets at a given angular position of the sheet-guiding cylinders and for transporting the sheets in a given travel direction, the printing units having side walls with respective rear and forward edges having supporting and bolt-on surfaces for mutually connecting the side walls of the respective printing units, includes a conventionally mass-produced sheet-transfer cylinder having the given unitary diameter operatively connecting and maintaining an angular position of a point of tangency for sheet transfer both of a sheet-releasing cylinder of one of the printing units and a sheet-guiding cylinder of a succeeding printing unit, the s

Abstract: A device for smoothly applying a sheet for printing onto an impression cylinder upstream of a printing gap of a sheet-fed rotary offset printing machine in travel direction of the sheet through the printing machine and including a jet nozzle device having at least one jet nozzle capable of being directed towards the circumference of the impression cylinder for pressing the sheet by blowing air force against the circumference, further includes a drive device couplable with the jet nozzle device for swingingly reciprocating the jet nozzle device in travel direction of the sheet during an operating cycle of the printing machine, the jet nozzle device being mounted at a spaced distance upstream from a printing gap and being swingable in a pendular manner about a pendulum axis extending parallel to an axis of the impression cylinder, the jet nozszle device being elongated and being formed with a middle region and ends offset upstream from the middle region in the travel direction of the sheet so that the sheet is

Abstract: A suction head for a feeder of a sheet-fed rotary printing press for feeding sheets of small format through the press in a given direction, including only one double sucker formed of two juxtaposed suction nozzles connected by a transverse tube and being disposed transversely to the feeding direction of the sheets, the only one double sucker being exchangeably secured at a center location of the printing press.

Abstract: A sheet feeder of a sheet-fed rotary printing press is provided with loosening blowers having controllable blowing power and being disposed so as to be adjustable in height on a frame of the sheet feeder behind and at the sides of a pile of sheets and including a plurality of fans for directing an air flow against a side face of the pile of sheets, the air flow being adjustable angularly with respect to the side face.

Abstract: A metal foil made by electroforming from a master pattern with the interposition of a negative form, and serving as packing for sheet guiding cylinders and/or drums of rotary printing machines, including a substantially planar member having one flat face and an opposite face with a textured surface structure corresponding to an upper side of the master pattern, the upper side of the master patten having been roughened by a jet treatment and coated with a levelling galvano-layer in order to eliminate undercuts, the master pattern per se, and method of manufacture.

Abstract: Device for scanning lengths of sheets in a sheet-processing machine, wherein the sheets travel with a leading and a trailing edge, including suction-air measuring nozzles alignable with the trailing edges of the sheets and connected to a suction-air source via control elements connected in an electrical circuit of the machine drive, a feeder for aligning the sheets to be processed at stops for the leading edges of the sheets, lift-type suckers for lifting the sheets individually off a pile of sheets, and have structure defining a scanning hole in at least one of the suction-air measuring nozzles, the one nozzle being disposed in the feeder and being directed towards the trailing edge of an uppermost sheet disposed on a pile of sheets, a suction-air connecting line connecting the one nozzle to the suction-air source, and a differential pressure-measuring valve connected in the line and cooperatively associated with the control elements.

Abstract: A device for smoothly applying a sheet for printing onto an impression cylinder upstream of a printing gap of a sheet-fed rotary offset printing machine in travel direction of the sheet through the printing machine and including at least one jet nozzle capable of being directed towards the circumference of the impression cylinder for pressing the sheet by blowing air force against the circumference, comprising drive means for swingingly reciprocating the jet nozzle in travel direction of the sheet during an operating cycle of the printing machine, the jet nozzle being mounted at a spaced distance and upstream from a printing gap and being swingable in a pendular manner about a pendulum axis extending parallel to an axis of the impression cylinder, the jet nozzle being couplable with the drive means.

Abstract: A sheet guiding cylinder of a rotary printing press includes a cylindrical member, at least the outer surface portion of which is formed of chemically resistant, wear-resistant and unyielding material and has a multiplicity of elevated solid surface portions consisting of a distribution of domelike structures of uniform height formed thereon.

Abstract: A device for scanning the length of a sheet in a sheet-processing machine including suction-air measuring nozzles alignable with the trailing edge of the sheet and connected to a suction-air source via control elements connected in an electrical circuit of the machine drive, and a feeder for aligning the sheets to be processed at stops for the leading edge of the sheet, and for lifting sheets individually off a pile of sheets includes a fall-type sucker formed of at least one of the suction-air measuring nozzles, the fall-type sucker being formed with a scanning bore directed in the feeder towards the trailing edge of the uppermost sheet in the pile of sheets, and a differential-pressure-measuring valve disposed in a suction-air line connected to the fall-type sucker, said differential-pressure measuring valve being cooperatively associated with the control elements.

Abstract: A sheet transfer device for a printing machine with a transfer drum having a rotational axis, a sheet transfer cylinder located downstream from the transfer drum in a travel direction of a sheet through the printing machine, and cooperating with the transfer drum, and a gripper device on the sheet transfer cylinder for gripping at a take-over location a leading edge of the sheet guided by the transfer drum whereby the sheet is transferred to the sheet transfer cylinder includes a sucker arrangement including suction elements disposed on the transfer drum in vicinity of a trailing edge of the sheet guided by the transfer drum, the suction elements, in a starting position thereof, being flush with the periphery of the transfer drum, a suction-air control device actuable for supplying suction air to the suction elements so that suction contact may be made between the suction elements and the sheet, a device for articulatingly linking the suction elements to the transfer drum so that the suction elements are chan

Abstract: Sheet-guiding drum assembly for sheet-fed rotary printing machines includes a drum formed with a casing surface and provided with a casing foil disposed so as to have a given outer diameter, a member arranged beneath the casing foil and on the casing surface of the drum, and a device for varying the height of the member on the casing surface for varying as well the outer diameter of the casing foil.

Abstract: Device for cleaning a textured outer cylindrical surface of a sheet-transfer cylinder in a sheet-fed rotary printing press includes a cleaning device corotatable with the cylinder, the cleaning device being replaceably mounted in the printing press and being bringable into engagement with the outer cylindrical surface of the cylinder at a region of the surface not carrying a sheet.

Abstract: A suction-type sheet-separating device for a feeder of a printing press has suction-type grippers for lifting off an uppermost sheet from a pile of sheets and for transferring the lifted-off sheet to a transporting device for conveying the lifted-off sheet in a sheet travel direction towards a printing unit of the printing press. The suction-type grippers are disposed above the pile of sheets in the vicinity of the trailing edge of each sheet and when suction air is applied thereto, they initially grip the uppermost sheet and then execute a prestroke to a first height. The device includes a lifting gear drive and a horizontal carrying shaft parallel to the trailing edge of the sheet and carrying the suction-type grippers, the suction-type grippers being aligned with respect to the carrying shaft.