Man Roland Druckmaschinen Ag

Man Roland Druckmaschinen

Albrecht Volz

Joachim Blumor

Holger Wiese

Klaus-Peter Reichardt

Helmut Schild

Peter Hummel

Valentin Gensheimer

Jurgen Wenzel

Achim Stoffler

Marc Hinz

Hubert Zschetzsche

Manfred Straub

Edgar Werber

Bernd Lindner

Klaus Schwinn

Thomas Herrmann

Hartmut Leichnitz

A drive for a sheet-fed printing machine, in particular a sheet-fed offset printing machine is described, in which the individual cylinders and/or drums and the plate or form cylinders are driven by a common drive train. In order to allow automated operations to proceed simultaneously, clutches are arranged in the drive trains of the individual plate or form cylinders and, furthermore, the individual plate or form cylinders are assigned drive motors which can be controlled separately and by means of which the plate or form cylinders can be driven in the intended manner after corresponding disengagement.

Drive for a sheet-fed printing machine

A printing machine is disclosed, in particular a sheet-fed offset printing machine, in which a plurality of cylinders are coupled to one another via a continuous drive train, and at least two cylinders include a controllable drive. The controllable drive stresses the drive train in order affect the tooth-flank contact of the gear train, which affects the angular position of the printing cylinders. By controlling the angular positions of the printing cylinders, precise registration is maintained during dynamic changes in the load on the gear train during the printing process. More specifically, blanket cylinders in the printing machine are each coupled to a position-controllable drive, which is controlled by applying a preferred position value in such a way that the gear train placed between two drives is stressed by a predefined angular amount.

Printing machine

A drive system for a sheet-fed offset printing press in which one or more cylinders are motor-driven in accordance with a prescribed desired position. According to the invention, a correction device receives measured angular position values of the cylinder from a rotational position sensor. The correction device then converts the measured position values into modified position values which are then sent to the drive controller. The drive controller compares the modified position values with desired cylinder position values and controls the motor so as to correct any deviation between the values. The correction device allows modification of the measured signals as needed to compensate for known or determinable parameters. A drive according to the present invention provides precise driving control, while reducing the required assembly and manufacturing accuracy of components such as the angle position sensor, and while compensating for other errors in drives.

Drive for a printing machine

A drive is provided for a sheet-fed offset printing press having multiple printing units. Each printing unit has printing cylinders which are independently driven. Transfer drums are driven mechanically uncoupled from the printing cylinders, and may be interconnected by a single gear train, or the transfer cylinders of each printing unit may be independently driven by a respective drive. Other rollers in the printing units may have individual controllable drives also. The invention minimizes disturbances caused by load fluctuations in conventional printing presses wherein the printing and transfer systems are mechanically intercoupled. The invention also is cost effective, particularly for register corrections. According to the invention, at least the plate cylinders are driven individually with respect to the sheet-transfer system or the corresponding blanket cylinder.

Drive for a printing press

A method and apparatus for controlling a multiple motor drive arranged to drive printing cylinders of a printing machine sychronously decelerates each of the drives upon a failure or defect occurring in one or more of the components of the drive system such that the individual printing cylinders are decelerated in a manner synchronized with one another with respect to rotation angle. The apparatus includes a main control device which detects a failure in one of the drive system components and controls the drive units to decelerate the drive units to a standstill in accordance with a time function. The time function is determined by the rotation of the drive unit which contains the component that failed. The apparatus ensures in an electrical and single-fault manner that the failure of a component in one of the drive units does not lead to rotation of the cylinders or axles beyond a predetermined amount which would cause damage to the grippers or the cylinders by the grippers contacting the cylinder surface of an adjacent cylinder.

Method and apparatus for controlling multiple motor drive of printing

This invention describes a control mechanism for an electric main drive of a printing machine, whereby the electric main drive operates with a motor, a brake and a tachometer generator. The machine control of the control mechanism is connected to a multiplicity of signal transmitters (pushbuttons). The signal transmitters detect the machine state to ensure that the printing machine does not run at an excessively high speed. For this purpose, the invention outlines, in addition to the machine control, a monitoring device which detects the switching states of the signal transmitters, forms a highest possible permitted speed therefrom and compares this value with the actual speed value delivered by the tachometer generator. The electric main drive is shut down as soon as the actual speed value overshoots this upper limit.

Control device for a printing machine

An undershot inking unit and associated method are disclosed. The undershot inking unit includes an ink fountain roller that is controlled independently of the printing speed of the printing machine, and in which the rotational contact angle of the distributor roller on the ink fountain roller is varied according to the printing unit speed. The method comprises controlling the rotational speed of the ink fountain roller independently of the printing speed of the printing machine; and varying the rotational contact angle of the intermittent ductor roller on the ink fountain roller according to the printing speed of the printing machine. In a preferred embodiment, the apparatus includes two coaxial cams rotatably adjustable with respect to each other. Each cam includes a predominant circumferential contour and a subordinate circumferential contour. By adjusting the relative rotational position of the cams, the rotational contact angle of the ductor roller on the ink foundation roller is varied according to the printing unit speed.

Method and apparatus for regulating ink distribution in an undershot

A system and method for controlling the lifting of a stack of sheets to be printed in order to keep the currently uppermost sheet of the stack within a certain predetermined height range for reliable removal to a feed table. A motor is operated in either a discontinuous mode or in a continuous mode to lift the sheets, the mode of operation being chosen in dependence on the speed of the press and the thickness of the sheets when compared against an established curve. A sensor is utilized to determine the vertical position of the uppermost sheet in the stack. In the continuous mode the motor speed is adjusted in accordance with the height of the uppermost sheet in the stack, while in the discontinuous mode, the motor is energized and de-energized such that the height of the currently uppermost sheet in the stack is maintained within a predetermined height range.

Growing community of inventors

Rodermark, Germany

Albrecht Volz