Abstract: A multi-motor drive for a printing press having a plurality of printing unit groups, includes at least one motor provided for each of the printing unit groups, and gear trains via which the printing unit groups are synchronously driven. The gear trains are mechanically separated from one another during a printing operation. The at least one motor is assigned to a respective separation location between the printing unit groups. A method for driving a printing press is also provided.

Abstract: A multi-motor drive for a printing press having a plurality of printing unit groups, includes at least one motor provided for each of the printing unit groups, and gear trains via which the printing unit groups are synchronously driven. The gear trains are mechanically separated from one another during a printing operation. The at least one motor is assigned to a respective separation location between the printing unit groups. A method for driving a printing press is also provided.

Abstract: An inking unit for a printing machine, having a metering system for printing ink, and equipment for conveying ink on a conveyor path between the metering system and a plate cylinder of a printing machine, includes a vacuum chamber for evaporating a dampening-solution portion from the printing ink.

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: Printing machine with at least one printing unit having rotating cylinders, comprising an energy converter disposed at least partially in one of the cylinders for converting at least some rotational energy of the cylinder into electrical energy and an energy storage device also disposed in the cylinder for storing the electrical energy.

Abstract: A method of conveying sheets by displacing in a sheet-conveying direction an upermost sheet of a pile of sheets having a contact surface of given length includes linearly lifting the sheet at a trailing edge thereof, briefly opening periodically and successively suction-air openings disposed above the pile of sheets in the sheet-conveying direction so as to form a wave crest running through the sheet starting from the trailing edge thereof and moving the sheet a displacement distance in the sheet-conveying direction in a plane relative to a top surface of the pile of sheets. The displacement distance corresponds to an amount by which the length of the sheet contact surface is shortened by the formation of the wave crest. A device is also provided for performing the method.

Abstract: A device for conveying sheets in a given travel direction includes a conveying head having a vacuum-applying device for removing an uppermost sheet from a pile of sheets and for maintaining the sheet under suction, the conveying head and the uppermost sheet being relatively movable in the given travel direction, the uppermost sheet being held against a sheet-contacting surface of the conveying head under suction, the conveying head having at least one rolling body surrounded by suction air and frictionally engageable with the uppermost sheet for moving the sheet in the given travel direction.

Abstract: Device for positioning an adjusting member which includes a pneumatic adjusting cylinder and an electromagnetically actuated valve operating in a low-wattage range for controlling aeration and venting, respectively, of the adjusting cylinder, comprising an electromagnetic system as well as an armature plate serving simultaneously, as a valve member for venting the cylinder, the armature plate being displaceable from a position thereof at which it defines a maximum air gap with the electromagnetic system to a position thereof at which it defines a zero air gap with the electromagnetic system in an excited condition of said electromagnetic system, said electromagnetic system in said excited condition thereof closing the cylinder against venting, and in the unexcited condition thereof opening the cylinder for venting.

Abstract: A device and method for detecting the coil temperature of a direct-current motor by determining the resistance of at least one coil of the motor. The method includes measuring a parameter of the at least one coil while the motor is running. The measurement is made at a time interval in which the coil is without current. The measuring device includes a commutation circuit of the motor which generates a time interval used for measuring the current.

Abstract: A device for conveying and aligning a sheet in a sheet-processing machine, with at least one frictionally driven ball having a dome facing towards the sheets for engaging a broad surface of the sheet and for moving the sheet in its plane includes structure for supporting the ball so that it is rotatable in all directions about a fixed mid-point thereof, and at least two frictional-force transmission locations located at the periphery of the ball and disposed at least 90.degree. from one another.

Abstract: A device for holding at least one of a rotational speed and a rotational angle encoder rigidly attached to a drive shaft includes a holding frame for the encoder, a crossbar spaced from said holding frame for fastening the holding frame to a machine, the holding frame having an upright disposition with substantially vertical side crosspieces, means for attaching substantially vertically disposed leaf springs to the side crosspieces of the holding frame, the leaf springs having respective ends connected to the crossbar, the holding frame having at least another leaf spring fastened to respective ends of the substantially vertical side crosspieces at a substantially horizontal side of the holding frame, and at least one structural element for securing the encoder within a range of section of the other leaf spring.

Abstract: Current-measuring device including a non-contacting current sensor and an evaluating device connected downstream to the sensor for producing an output signal proportional to a current being measured, comprising a circuit arrangement for determining a zero drift of at least one of the evaluating device and the current sensor from symmetrical components of the current being measured and for correcting the drift.

Abstract: A device for detecting the rotational speed of a motor by a first rotational speed sensor and at least a second rotational speed sensor and a switch unit connected to the rotational speed sensors, the switch unit selecting signals from one of the sensors within a respective given rotational speed range.

Abstract: A sheet feeder of a printing machine has sheet separating and conveying facilities and a stack table which raises a stack of sheets by means of a controlled lift drive so that a respective uppermost sheet of the stack is in an operating position for the sheet separating and conveying facilities, the sheet separating facility including separating suckers for raising, in timed sequence, a respective trailing sheet end, as viewed in sheet conveying direction through the feeder, a suction line connecting the separating suckers to a suction source, a pressure measuring device connected in the suction line for determining an actual instant of time at which a respective sheet is sucked up by the separating suckers, a comparator device for comparing the actual suction instant of time with a nominal suction instant of time generated in synchronism with rotation of the printing machine to determine a difference value, a comparator device for comparing the difference value with a value corresponding to an optimum height