Abstract: In a method for controlling a distributor roller of a printing press, the phase position of at least one reversal point of the distributor roller is changed automatically during the ongoing printing. A change is made to the phase position for every specified number of revolutions of a plate cylinder.

Abstract: In a method for controlling a distributor roller of a printing press, the phase position of at least one reversal point of the distributor roller is changed automatically during the ongoing printing. A change is made to the phase position for every specified number of revolutions of a plate cylinder.

Abstract: A method for setting up printing presses includes providing cylinders, a drive for at least one cylinder, a register adjustment device for at least one cylinder and at least one control unit. During set-up operations on the printing press, the control unit actuates the register adjustment device while the printing press is being accelerated or decelerated or while washing operations in the printing press are being carried out and while a production run is switched off and cylinders are rotating. A printing press carrying out the method is also provided.

Abstract: A method for setting up printing presses includes providing cylinders, a drive for at least one cylinder, a register adjustment device for at least one cylinder and at least one control unit. During set-up operations on the printing press, the control unit actuates the register adjustment device while the printing press is being accelerated or decelerated or while washing operations in the printing press are being carried out and while a production run is switched off and cylinders are rotating. A printing press 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 method for roller adjustment in a printing press includes providing a first roller, a second roller and a third roller. The second roller bears both against the first roller and against the third roller and is oriented in an axially nonparallel manner relative to the third roller. The first roller is displaced into a position in which the first roller is oriented in an axially nonparallel manner relative to the third roller. A dampening unit for carrying out the method is also provided.

Abstract: A method for roller adjustment in a printing press includes providing a first roller, a second roller and a third roller. The second roller bears both against the first roller and against the third roller and is oriented in an axially nonparallel manner relative to the third roller. The first roller is displaced into a position in which the first roller is oriented in an axially nonparallel manner relative to the third roller. A dampening unit 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 method for automatically adjusting a pressure between rotary bodies in a printing press, includes measuring an image of a pressure strip on printing material. An image of a first pressure strip formed by a first rotary body together with a second body and an image of a second pressure strip formed by the second rotary body together with a third rotary body, are measured on the printing material. 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 roller for a printing machine, such as a slip roller or a ductor roller, has a circumferential surface provided with a surface structure and formed of a nonmetallic material. The surface structure is irregularly structured with a plurality of elongate elevations extending substantially parallel to the roller axis and parallel to one another. The elevations have an arithmetic average height, determined by the elevations, of at least 12 microns.

Abstract: A method for driving rollers of a printing unit of a printing press, includes driving at least two of the rollers at different speeds for transferring liquid. A change in the torque on one of the rollers is determined. A drive for at least one of the rollers is set in dependence on the change in the torque.

Abstract: A device for selectively positioning at least one cylinder in a printing machine, the cylinder being rotatably mounted in a carrier and, together with the carrier, forming a unit that is adjustable into different positions, includes a guide, and a drive for adjusting one of the unit and the carrier, respectively, along a first direction of motion and placing it on the guide for guidingly adjusting it along a second direction of motion.

Abstract: A dampening unit for a printing press contains a first roller and a second roller that together form a slip gap. The dampening unit is distinguished in that a pivot axis, about which the first roller is pivotably supported against the second roller, extends through a center axis of the first roller and substantially parallel to a tangential line that is located on a line L which extends through the slip gap.

Abstract: A device for positioning and tensioning a cylinder dressing on a printing-machine cylinder, wherein both a leading dressing end and a trailing dressing end of the cylinder dressing are tensioned, includes, in a first step, tensioning both dressing ends, and in a second step, relieving the tension in a first of the two dressing ends, while retensioning a second of the dressing ends; and a printing machine provided with the device.

Abstract: A device for ensuring correct tooth engagement during coupling of an adjustable, first gearwheel to a second gearwheel of a printing-material processing machine, includes a first adjustment device for adjusting the first gearwheel in a direction towards the second gearwheel during coupling, and further includes a protrusion and a guide for guiding the protrusion during the coupling, the protrusion being disposed eccentrically to one of the two gearwheels and being connected to the one gearwheel, so that, during rotation of the one gearwheel about a central axis thereof, the protrusion is rotatable together with the one gearwheel.

Abstract: A clamping device for firmly clamping a cylinder packing or covering on a printing machine cylinder, the clamping device having a clamping seat, a clamping jaw cooperating therewith, and an eccentric shaft, includes a support wherein the eccentric shaft and the clamping jaw are jointly mounted, the support being adjustable alternatively into a first support position and into a second support position relative to the clamping seat; and a printing machine having at least one clamping device with the foregoing construction.

Abstract: A dampening unit of a planographic printing machine has a pan roller, a transfer roller, and a dampening unit roller. The transfer roller is held in bearing contact against the dampening unit roller with a regulating force such as, in particular, a spring force FF. The transfer roller, together with the pan roller, is pivotable about a pivot axis that is offset relative to the roller axis of the pan roller, and/or the pivot axis lies essentially on a tangential line running through a circumferential contact point which is formed by the transfer roller together with the dampening unit roller.

Abstract: A transfer drum in a sheet-fed printing press having a support surface formed at least segmentally of individual punctiform support elements disposed on the circumference of the transfer drum includes another support surface disposed at least segmentally on the circumference of the transfer drum, the other support surface being continuous, both of the support surfaces being mutually interchangeable.

Abstract: An inking unit for a rotary printing press with inking rollers, at least one of which has a hard outer cylindrical surface, including a device having nozzles for applying fresh cleaning fluid onto the respective inking rollers and a device for squeegeeing cleaning fluid soiled with ink residues from the roller of the inking unit having the hard outer cylindrical surface, further includes a drip pan disposed beneath the nozzles and formed with a drain having a discharge end, the squeegeeing device being a doctor blade device and having assigned thereto a collection vessel wherein the drain discharge end terminates, the collection vessel being periodically removable from the printing press for emptying therefrom the collected cleaning fluid soiled with ink residues, and a follow-up trough assigned to the drain discharge end, the follow-up trough being swingable beneath the discharge end when the collection vessel is removed from the printing press.