Abstract: An apparatus and a method for changing printing plates in sheet-fed rotary printing presses include a plurality of printing units and plate cylinders being coupled to one another mechanically in the printing units during a printing operation. At the beginning of a plate change, the plate cylinders are coupled to one another mechanically and are driven jointly by a main drive motor. After an old printing plate has been conveyed out, each plate cylinder is decoupled from the common mechanical connection and is driven by a separate drive motor.

Abstract: A method and an apparatus for coupling or uncoupling a cylinder, in particular a plate or blanket cylinder, to or from a gear train of a printing press or for coupling and uncoupling the cylinder to and from an auxiliary drive, for example for service work or during changeover processes, includes firstly accelerating the auxiliary drive to a predefined rotational speed, then coupling the auxiliary drive to the cylinder and then uncoupling the cylinder from the main drive. A sheetfed rotary printing press having the apparatus is also provided.

Abstract: In an apparatus for clamping and releasing a gearwheel rim with respect to a main gearwheel that bears the gearwheel rim, a clamping apparatus includes an axially guided, displaceable clamping plate clamping the gearwheel rim between the plate and the main gearwheel. Antifatigue bolts are used for such a purpose. The bolts are expanded by an actuator for releasing the clamped gearwheel rim to an extent that cancels the clamping action.

Abstract: An apparatus and a method for changing printing plates in sheet-fed rotary printing presses include a plurality of printing units and plate cylinders being coupled to one another mechanically in the printing units during a printing operation. At the beginning of a plate change, the plate cylinders are coupled to one another mechanically and are driven jointly by a main drive motor. After an old printing plate has been conveyed out, each plate cylinder is decoupled from the common mechanical connection and is driven by a separate drive motor.

Abstract: A configuration for feeding a lubricant to a lubrication point on a revolving part of a printing technology machine includes a stationary lubricant container and a conveying device for conveying lubricant out of the container to the revolving part. A sealed antifriction bearing on the revolving part has a bearing ring fixed against rotation. At least one lubricant feed duct extends to a bearing chamber for antifriction elements of the antifriction bearing. At least one lubricant duct in the revolving part leads from the antifriction bearing to the lubrication point.

Abstract: In an apparatus for adapting the pressing force of a control roller on a control can in a sheet-processing machine by a torsion spring, the apparatus either changes the effective spring length or the spring stiffness as a function of the rotational speed of the sheet-processing machine. The spring can be a torsion spring rod with an actuator setting the spring force by changing the prestress. A stiffening element can be connected to the torsion spring rod and set the spring force by changing the spring stiffness of the torsion spring rod.

Abstract: A method of varying a drum profile of a vario drum for transporting printing material sheets, in which shell segments of the vario drum are pivoted inward and outward. Sheet supporting elements assigned to the shell segments are reversibly deformed by pivoting the shell segments. A vario drum suitable for implementing the method and a machine containing the vario drum for processing printing material sheets contain the shell segments and the associated sheet supporting elements.

Abstract: A drive for a rotary printing press has a clutch with improved reliability in the main drive gear train. The drive has a gearwheel mechanism for transmitting a rotational movement of transfer drums during delivery of a printing material. The gearwheel mechanism includes a gearwheel pair with a driving gearwheel and a driven gearwheel and the driven gearwheel, which is arranged coaxially with respect to the driving gearwheel, is coupled during delivery to a shaft journal of a transfer drum. A clutch is provided for selectively producing and interrupting the transmission of torque between the driving gearwheel and the driven gearwheel. At least one motor is provided for feeding a torque into the gearwheel mechanism. A stepup gear mechanism is arranged in the torque flow between a clutch half of the clutch and a gearwheel.

Abstract: A drive for a rotary printing press makes a reliable transmission of high torques possible and, with low structural expenditure, setting of the phase in the main drive gear train. In the drive for a rotary printing press, two adjacent transfer drums are mounted with shaft journals in side walls, a gearwheel of the gearwheel mechanism is disposed fixedly in terms of rotation on the shaft journals and the gearwheels are not in direct engagement with one another. The gearwheels of the adjacent transfer drums are permanently in engagement in each case with one intermediate gear. The gearwheels of the adjacent transfer drums and the intermediate gears are kept at a spacing from one another in each case with one lever. The intermediate gears are kept at a spacing in each case from one another with a coupler. The coupler can be disconnected and the engagement of the teeth of the intermediate gears can be canceled.

Abstract: In an apparatus for adapting the pressing force of a control roller on a control can in a sheet-processing machine by a torsion spring, the apparatus either changes the effective spring length or the spring stiffness as a function of the rotational speed of the sheet-processing machine. The spring can be a torsion spring rod with an actuator setting the spring force by changing the prestress. A stiffening element can be connected to the torsion spring rod and set the spring force by changing the spring stiffness of the torsion spring rod.

Abstract: In an apparatus for clamping and releasing a gearwheel rim with respect to a main gearwheel that bears the gearwheel rim, a clamping apparatus includes an axially guided, displaceable clamping plate clamping the gearwheel rim between the plate and the main gearwheel. Antifatigue bolts are used for such a purpose. The bolts are expanded by an actuator for releasing the clamped gearwheel rim to an extent that cancels the clamping action.

Abstract: A device for locking, with respect to a first power transmission element, a further power transmission element that is lockable in a rotational position thereof, provides for the first and the further power transmission element to have a common working chamber with a variable volume to which a pressure medium can be applied, it being possible for the pressure medium in the working chamber to be solidified by applying an electric voltage or a magnetic force field thereto.

Abstract: A reversing or turning assembly of a sheet-processing machine includes an impression cylinder having a circumferential surface for transporting sheets thereon for printing the sheets in a printing nip associated with the impression cylinder. Gripper devices are provided for gripping the printed sheets at a respective trailing edge thereof and for lifting the gripped sheets off the impression cylinder for reversing the gripped sheets. The circumferential surface of the impression cylinder is formed with recesses in a region thereof occupied by the trailing edge of the sheets, for permitting the gripper devices to penetrate or dip into the recesses to grip the sheet trailing edge. The recesses have a position being variable in circumferential direction of the circumferential surface of the impression cylinder for adapting to different sheet formats.

Abstract: A gear train for a machine for processing flat printing materials includes a coupling for separating and closing the gear train. The gear train further includes rotating elements having toothing systems which, in a closed state of the gear train, are in mutual engagement and, in a separated state of the gear train, are out of engagement. A multiplicity of the rotating elements are combined into pairs. The toothing systems of one of the pairs of rotating elements has a tooth pitch differing from the toothing systems of a respective other of the pairs of rotating elements. A machine, including the gear train, for processing flat printing materials, is also provided.

Abstract: A method of varying a drum profile of a vario drum for transporting printing material sheets, in which shell segments of the vario drum are pivoted inward and outward. Sheet supporting elements assigned to the shell segments are reversibly deformed by pivoting the shell segments. A vario drum suitable for implementing the method and a machine containing the vario drum for processing printing material sheets contain the shell segments and the associated sheet supporting elements.

Abstract: A device for positively coupling one force transmission element with a further force transmission element includes a multi-disk clutch formed of at least four disk rings for adjusting the rotary position of the further transmission element in relation to the one force transmission element, the disk rings being axially displaceably mounted and, for both directions of rotation, having a play-free operative connection with the force transmission elements.

Abstract: An apparatus for guiding and transferring a sheet in a printing machine from a first cylinder to a gripper of a second cylinder in which the apparatus has a guide device for a holding element, which is held outside the first and second cylinder. In this way, the design of the guide apparatus can be independent of the first and second cylinders. In addition, a longer time period is available for gripping, tensioning and transferring the sheet. The apparatus can be used both in a recto printing machine and in a turner device in recto and verso printing.

Abstract: A machine for processing sheets, in particular a sheet-fed rotary printing machine, includes a transporting cylinder for transporting the sheets and having air nozzles disposed offset in relation to one another in a direction other than an axis-parallel direction of the transporting cylinder, and having a directing configuration for directing the sheets and having air nozzles, the configuration being assigned to the transporting cylinder. The machine is distinguished in that the air nozzles include throttled air nozzles and unthrottled air nozzles.

Abstract: In a device for reducing the frictional force between a guiding or carrying element for sheets in a sheet-processing machine, in particular rotary printing machines, guiding and carrying elements acted upon by throttled blowing air include a sheet surface, orifices fluidically connected to a hollow interior, and a throttle disposed in the hollow interior. The elements are to be connected to an air source for blowing air out through the orifices and for generating an air cushion between a sheet and the sheet surface. Each of the orifices is preceded by the throttle with respect to a direction of air from the air source.

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.