Abstract: A method for operating a printing unit of a printing press includes operating the printing unit in a first operating mode, for example printing operation, and in a second operating mode, for example maintenance operation. In the first operating mode, a printing unit cylinder and a distributor roller are driven rotationally by a first motor and the distributor roller is driven axially by a second motor. In the second operating mode, the distributor roller is driven rotationally by a third motor and the distributor roller is driven axially by the second motor. A printing press for carrying out the method is also provided.

Abstract: A method for operating a printing unit of a printing press includes operating the printing unit in a first operating mode, for example printing operation, and in a second operating mode, for example maintenance operation. In the first operating mode, a printing unit cylinder and a distributor roller are driven rotationally by a first motor and the distributor roller is driven axially by a second motor. In the second operating mode, the distributor roller is driven rotationally by a third motor and the distributor roller is driven axially by the second motor. A printing press for carrying out the method is also provided.

Abstract: A printing press includes at least one printing unit having a cylinder and a cover covering the cylinder. Actuators are associated with the cylinder for changing a geometry of the cover in axial and/or circumferential direction of the cylinder. Positioning electronics are connected to the actuators and a printing press machine control system is connected to the positioning electronics. An image inspection device is connected to the printing press machine control system at least for geometric measurement of printed printing materials. A printing press computer processes measured results from the image inspection device for carrying out a desired/actual value comparison and for driving the actuators to minimize determined deviations, in the event that deviations are determined.

Abstract: A belt conveyor of a printing-material sheet processing machine includes a belt for transporting the printing-material sheets, the belt having openings, and a roller, which has pins for engaging in the openings. At least one ring is rotatably mounted on the roller, relative to the pins, the belt lying on the ring. This belt conveyor is suited for conveying a printing-material sheet, wherein the belt is driven by the roller virtually exclusively via a form lock between the pins and the openings and virtually without a friction lock between the inner surface of the belt and the peripheral surface of the roller. The belt conveyor may be, for example, a sheet brake of a delivery of a printing press.

Abstract: A cladding of a printing machine in a region of a side wall of a printing unit of the printing machine includes a housing fastened to the side wall, the housing having an upper housing wall, two lateral housing walls and a housing cover connected to the lateral housing walls so as to be displaceable between a lower position covering the side wall and a position raised to a defined height.

Abstract: A device for automatically changing printing plates is provided in a printing machine having a plate cylinder to which a printing plate is to be fed and on which the printing plate is to be fixed detachably. The device includes a transport system for conveying the printing plate while permitting axial compensating movements thereof. The transport system has at least one driven transport roller and an air cushion for holding the conveyed printing plate in contact with the transport roller. The plate-holding air cushion is formed between a counterpressure element, on one side, and the printing plate, on the other side.

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 method for the register-true alignment of sheets (1) before the transfer to a sheet-processing machine with the assistance of a carrier (7,9) that is movable in the machine cycle and is driven as a function of a signal, in order to feed the sheets individually to an aligning stop. To permit exact and reliable alignment even at high machine speeds with an uncomplicated mechanism, the signal is generated when a sheet edge (12) to be fed passes a predetermined location between the carrier (7,9) and aligning stop (5), and in response to the signal, the carrier performs a preset movement, identical from sheet to sheet, by which the carried-along sheet (1) is fed to the aligning stop with a speed greater than zero, but substantially less than the maximum sheet speed during the feeding movement. The method is particularly suitable for side-edge alignment, but is also suitable for leading-edge alignment.

Abstract: A device for automatically changing printing plates is provided in a printing machine having a plate cylinder to which a printing plate is to be fed and on which the printing plate is to be fixed detachably. The device includes a transport system for conveying the printing plate while permitting axial compensating movements thereof. The transport system has at least one driven transport roller and an air cushion for holding the conveyed printing plate in contact with the transport roller. The plate-holding air cushion is formed between a counterpressure element, on one side, and the printing plate, on the other side.

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 method for the register-true alignment of sheets (1) before the transfer to a sheet-processing machine with the assistance of a carrier (7,9) that is movable in the machine cycle and is driven as a function of a signal, in order to feed the sheets individually to an aligning stop. To permit exact and reliable alignment even at high machine speeds with an uncomplicated mechanism, the signal is generated when a sheet edge (12) to be fed passes a predetermined location between the carrier (7,9) and aligning stop (5), and in response to the signal, the carrier performs a preset movement, identical from sheet to sheet, by which the carried-along sheet (1) is fed to the aligning stop with a speed greater than zero, but substantially less than the maximum sheet speed during the feeding movement. The method is particularly suitable for side-edge alignment, but is also suitable for leading-edge alignment.

Abstract: A cladding of a printing machine in a region of a side wall of a printing unit of the printing machine includes a housing fastened to the side wall, the housing having an upper housing wall, two lateral housing walls and a housing cover connected to the lateral housing walls so as to be displaceable between a lower position covering the side wall and a position raised to a defined height.

Abstract: A feeder for a sheet-fed printing press includes a feeding table having a surface which, at least in subregions thereof, is formed with through openings, over which sheets separable or singlable by a suction head are transportable against lays for aligning the sheets and through which air feedable under the sheet in the region of the suction head is dischargeable in a downward direction, the feeding-table surface having edge portions formed with a respective inclination, the edge portions defining the openings.

Abstract: Sheet-guiding device assembly includes at least one sheet hold-downer disposed on a movable protective guard.

Abstract: Pull lays on a feed table of a sheet-fed rotary printing machine are adjusted by a pulling device for laterally aligning sheets thereon. A spindle, which extends transversely to the travel direction, displaces the pull lays for adjusting to a sheet format to be processed. The spindle engages indirectly at a housing of the side lays which is provided with bearing and guide elements. The pull lays are thereby subject to an energy storing device which supports them in a guide transversely to the feed table.

Abstract: Sheet-guiding device assembly of a sheet-processing machine includes at least one sheet hold-downer disposed on a movable protective guard. The guard is swivellably or slidingly supported. The guard may be formed with an aperture in which the sheet hold-downer is disposed. The spacing of the sheet hold-downer to a feed table of the sheet-processing machine is adjustable.

Abstract: A pile board receiver of a pile lifting device comprising pivotal entrainer hooks having respective pivot points from which the entrainer hooks extend downwardly, the entrainer hooks being vertically guidable and being pivotable in a direction towards a location at which a pile board is receivable in the receiver, each of the entrainer hooks having a hook opening disposed below the respective pivot point and directed towards the location, the respective pivot point being located beyond the location; each of the hooks being formed with a respective prong extending into a region of the receiver wherein a pile board receivable in the receiver is liftable therein; and the method thereof.

Abstract: Device for adapting negative pressure in a suction belt feed or supply table of a sheet feeder to operating conditions which vary during sheet conveyance, having at least one endless, revolvingly driven conveyor belt provided with suction openings, and a side alignment device for laterally aligning a respectively foremost sheet of a shingled or overlapping sheet stream, and at least one suction box disposed below a conveying plane, the suction box, in a sheet feeding direction, being subdivided into a plurality of chambers subjectible to negative pressure independently of one another, includes a conveyor belt, a plurality of suction chambers disposed in the conveying plane below the conveyor belt, a common suction union and a swivelable shutoff element for selectively connecting the suction chambers to the suction union.

Abstract: Device for correctly-registered feeding of sheets supplied thereto in a sheet stream in a sheet transport direction, to front lays of a sheet-processing machine having a lateral pulling device, and a sheet-advancing device disposed within a smallest format width to be processed. The feeding devices includes at least one permanently driven drive roller disposed in the vicinity of the front lays, and at least one contact pressure device cooperatively engageable with the at least one drive roller. The drive roller has a rotational axis directed crosswise to the sheet transport direction, and at least part of the drive roller is disposed laterally of the sheet advancing device.

Abstract: Device for conveying a continuous shingled or overlapping sheet or copy stream to a rotary printing press, with a conveying table, at least one endless, revolvingly drivable conveyor belt surrounding the conveying table, and at least one suction box disposed beneath the conveying table and being connected through suction openings with the underside of the conveyor belt, the conveyor belt being formed with through-perforated suction holes, the suction box being formed with at least two suction chambers subjectible to negative pressure or vacuum independently of one another, includes a base member forming a suction box, profiled guide sections accommodated in the base member, suction ducts formed between edges of the profiled guide sections and boundaries of the base member, the edges forming a seal, and the suction ducts extending in different planes in the base member.