Abstract: A method of operating a lifting sucker which takes sheets off a pile, the sheets being picked up and lifted by suction, which comprises determining at least one of the physical variables characterizing the method and comparing it with an associated desired value, and initiating countermeasures if there are any deviations from the desired value; and a lifting device operated by 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 printing press has a ductor inking unit that includes a ductor roller and a motor for moving the ductor roller via a rotatable cam disc, the motor being constructed so as to subject the cam disc to periodic angular acceleration at constant printing speed of the printing press, and so as to rotate the cam disc alternatingly in opposite rotational directions; and a method of operating the printing press.

Abstract: A printing machine, which includes at least two printing unit groups having drives which are decoupled from one another and assigned, respectively, to one printing unit group, and having printing units with transfer cylinders, include compensation elements for compensating for speed differences and positional errors between two printing unit groups. The compensation elements are assigned to a printing unit group which is an accepting printing unit group, in order to compensate for transfer errors.

Abstract: A printing press drive system includes at least one drive having a motor with an external rotor equipped with permanent magnets, the one drive being assigned to at least one cylinder of the printing press for driving the cylinder, and with a stator provided with windings and firmly fixed to the side panel of the printing press, at least part of the drive system being implemented via a gear train, and the rotor having a gear rim at a perimeter thereof.

Abstract: A device for transporting to a printing press, sheets singly separated from a sheet pile, includes an electromagnetic linear drive mechanism; and a method of operation of the device.

Abstract: A device and method for synchronizing at least two printing-unit groups (2, 3) which represent a sheet-fed printing machine (1). Between the two printing-unit groups (2, 3) there is provided a transfer unit (10) being operable by means of a separately controllable drive (12). The present invention is used in sheet-fed printing machines assembled in serial arrangement.

Abstract: A device for depositing paper sheets, in particular on a sheet pile or stack in a delivery of a printing machine, includes a revolving belt, a drive motor for driving the revolving belt separately from any other drive system, and at least one suction device having a discretely effective suction action, the suction device being disposed on the revolving belt, the revolving belt being constructed as a toothed belt for transmitting torque and synchronicity between the drive motor and the suction device; and a method of operating the depositing device.

Abstract: A drive system for an oscillating gripper of a sheet-fed printing machine has a main drive train and a controlled drive. The pregripper is mechanically coupled to the main drive train. The controlled drive supplies energy required to drive the pregripper in accordance with a position of the pregripper. The controlled drive at least approximately meets the discontinuous energy requirement of the pregripper.

Abstract: Device for conveying single sheets or a shingled sheet stream in a feeder region of a sheet-processing machine of a conveyor table equipped with at least one endless conveyor belt, and at least two rotatably supported deflection rollers over which the conveyor belt is guided, the conveyor belt being disposed so as to convey the sheets in a region between a sheet pile and front stops, wherefrom the sheets are transferable to a further processing location of the sheet-processing machine, includes a motor for driving the conveyor belt uncoupled from the sheet-processing machine, and a computer and control device for triggering the motor with a predetermined velocity profile exhibiting a velocity change as a function of an angular position of the sheet-processing machine; and method of operating the sheet-conveying device.

Abstract: Device for damping mechanical vibrations of a printing press having rotating parts includes at least one actuating member assigned to the rotating parts of the printing press for applying adjusting forces thereto, and at least one vibration pick-up operatively connected to the actuating member for controlling the actuating member so that the adjusting forces applied by the actuating member damp the mechanical vibrations; and method of damping mechanical vibrations of a printing press.

Abstract: A printing press includes a plurality of mutually mechanically decoupled printing-unit groups each having at least one individual printing unit. A drive for the printing press includes drive motors each being associated with a respective one of the printing-unit groups. Devices are each associated with a respective one of the printing-unit groups for rotational-speed and/or angle-of-rotation determination. An angle feedback control device dimensions a permissible angle-of-rotation deviation of the printing-unit groups from a preselected angle setpoint value in such a way that the deviation is minimal at least in an angle-of-rotation position in which sheet transfer takes place.

Abstract: Drive for a printing press having a plurality of printing units having plate cylinders, elements for transporting stock, and elements which do not transport stock includes a gear-transmission device for interconnecting the printing units, a plurality of motors, respectively, coupled at various locations to the gear-transmission device, a device for controlling and regulating delivered power connected to the motors, and a device for feeding signals regarding rotational speed in the gear-transmission device to the control and regulating device, the gear-transmission device including a gear-transmission unit for driving all of the stock-transporting cylinders and the plate cylinders; at least one of the motors being connected to the gear-transmission unit; at least one sensor for detecting motion variables in the gear-transmission unit; at least one drive for driving the elements of the printing press which do not transport stock; at least another sensor for detecting motion variables in the drive for driving th