Man Roland Druckmaschinen Ag

Man Roland Druckmaschinen

Hans E Mamberer

Ingo Kobler

Otto Spang

Eduard Hoffmann

Rainer Burger

Johann Winterholler

Armin Weichmann

Josef Hajek

Wolfgang Prem

Reinhard Zeller

Dieter Hirt

Werner Maier

Helge Zwosta

An anilox offset printing unit includes a short inking device mounted between side walls with a screen roller which can be doctored and immersed in an ink reservoir, an inking roller, and a plate cylinder for inking a rubber blanket cylinder, and a damping device acting on the plate cylinder. An adjusting device having two degrees of freedom serves to adjust the distance between the axes of the inking roller and the screen roller and/or the distance between the axes of the inking roller and the plate cylinder, wherein the adjustment is carried out by the adjusting device in accordance with a measurement value determined by a measuring element which interacts with the adjusting device.

Anilox offset printing unit with a short inking device

An offset blanket for a grooveless blanket cylinder for applying a printed image onto web material or sheet material is composed of a carrier plate which has been cut to size and a rubber layer placed on the carrier plate. The beginning and the end of the carrier plate of the rubber layer are connected to each other so that the outer circumferential surface of the blanket is continuous and without gaps. The blanket surrounds the blanket cylinder in the operating position in the form of a sleeve in a frictionally engaging manner but releasably. A register device is provided on at least one end face of the blanket for securely positioning the blanket on the blanket cylinder.

Offset blanket for a grooveless blanket cylinder composed of a carrier

A method for detecting diffuse reflections of full-tone and half-tone fields in order to prepare diagnoses on problem factors and/or changes in process parameters, such as blurring, dampness, machine temperature. During printing, the diffuse reflections of the full-tone and half-tone fields are detected with scanners. This is done in such a way that for at least two printed copies, in at least two fields of each copy, the diffuse reflections of full-tone and half-tone areas, or of at least two half-tone fields of different area coverages are compared, and based on the results of this comparison, diagnoses and/or control recommendations are made.

Printing process diagnostic method and system for a rotary printing

An apparatus for threading webs in rotary printing machines. A threading belt (13) in the form of a hook band of a 'VELCRO' closure is guided on the threading path, and the leading edge of the web has a loop band (35) which is engaged in the threading belt.

Apparatus for threading webs in rotary printing machines

To position two relatively rotatable elements, for example folding jaw control elements of a folding jaw cylinder of a rotary printing machine, with respect to each other, and re-position the elements, a positioning drive (7), for example a motor coupled to a gear, which is coupled for rotary transmission to an axially movable shaft or rod element (10, 10'), movable, for example, under fluid, preferably pneumatic pressure. When projected, the coupling element is engageable with a positioning gear (12) on one of the elements (22) and, upon rotation of the element by the positioning drive, can effect re-adjustment of the angular position of the other element, upon engagement with a positioning gear (11) coupled thereto. The arrangement permits remote positioning and indication of relative position by a feedback transducer (13, 113), such as a potentiometer, which can provide position signals suitable for a display (B).

Positioning system for rotary folding jaw cylinder adjustment elements

To permit essentially automatic control of roll changing to change between an old roll and a replacement roll of printing machine paper, adhesive is applied to the old roll, at predetermined locations, as the old roll runs off, and the now sticky surface is engaged against the beginning portion from the new roll, the old roll then being severed within the range of the still sticky portion to ensure complete adhesion of substrate from the old roll on the substrate of the new roll. Excess adhesive which is not covered by substrate from a new roll is deactivated by a deactivating element (7) positioned in advance of any deflection roller to prevent accumulation of adhesive on any elements of the roll changer of the printing machine.

Printing roll changer system, and method of roll changing

To permit versatile operation of a multi-station printing machine installation or system having a first printing machine subsystem for printing on a first substrate web which includes a plurality of printing stations (2-5) and accessory apparatus, such as dryers, coolers, folders and the like, and a second printing machine subsystem (11) likewise having a plurality of printing stations (12-15), dryers, coolers and folders, and wherein the first subsystem, additionally, includes auxiliary apparatus such as a lacquering unit (6), an adhesive application unit (21), and further paper handling units (22, 23, 24) which may be useful for certain printing jobs carried out by the further printing machine subsystem (11) but are not always used for printing jobs in the first subsystem (1), substrate web guide means (47-50, 53, 54) are provided in each one of the subsystems to guide the web from, for example, the further subsystem (11) to the auxiliary apparatus (6; 21-24) of the first subsystem and then, if desired, back to the remaining units of the second subsystem. The arrangement permits selective use of auxiliary apparatus units which are not always needed, and thus which are required, in the overall installation, only once. A synchronizing and control unit (10, 10') receives, in servo loops, input command signals from an input/output unit (55) and provides motor control signals, individually, to the drive motors (41, 43, 44) of the respective subsystems as well as to drive motors (42, 69) of the auxiliary apparatus, so that the auxiliary apparatus will operate in synchronism with the motors of the respective subsystem primarily handling printing on the respective substrate web (45, 46).

Multi-station printing machine system

To permit both circumferential as well as axial register adjustment of three printing couples (1, 2, 3), in which the respective cylinders of the printing couples are interconnected by spiral gears, two of the blanket cylinders (4, 8) are axially shiftable. The changes in circumferential register, upon changing of lateral register--due to the spiral gears--are compensated by position motor controllers (34, 44) which may include a microprocessor (50), automatically. Lateral register is set in a predetermined sequence by the respective cylinders, in accordance with the coupling of one of the plate cylinders (e.g. 5) with a printing machine main drive pinion (68).

Printing machine register adjustment system

To prevent printing of imperfect copy, by a printing machine having a lifter-type inker, which is caused by cyclically recurring rotary oscillations or vibrations, the braking torque introduced upon contact of a lifter roller (3) with the first milling and distribution roller (4) of the inker is prevented from propagating through the gearing drive of the respective inker rollers. To prevent such propagation, the first milling and distributing roller (4) is yieldingly driven at machine speed, for example by frictional drive, transmitted through an elastic surface (6) of a 'soft' roller in frictional drive engagement with the first milling and distributing roller (4) as well as with a positively driven subsequent milling and distributing roller (7), or a circumferentially resilient yielding coupling (13) is interposed between the drive shaft element (8) for the first milling and distibuting roller and a positive gear drive (10, 11, 12). Preferably, the inertia of the first milling and distributing roller is high with respect to that of the lifter roller (3), and is, for example, enhanced by a fly-wheel (4 a).

Lifter-type inker for rotary printing machine including rotational shock

To match the width of zone adjustment of doctor blade elements or zones of a continuous doctor blade of a printing machine inking system to pick up units of photoelectric transducers scanning patterns, in columnar zones, so that the degree of inking of the ductor roller can be matched to the degree of printing density of the pattern in the respective zones by control of the doctor blade elements or zones, the transducer arrangement includes a plurality of transducer elements of selectively different transducing widths, associated with the zones of information coverage of selectively different widths to match the width of the transducing means to the zones and for transmission of thus matched transduced signals to the printing apparatus and derive an output of utilization signals with respect to the zones of selectively different widths. Transducing elements of respectively different widths may be used (FIG. 3); or much narrower transducing elements, the outputs of which are then combined in a summing circuit and in which the number of the transducing elements, transverse to the transport direction of the pattern, is equal to the common divisor of the zone width (e.g. for zone widths of 30, 35, 40 mm, a transducer width of 5 mm); or transducers of fixed widths can be located on parallel arms of a scissor grid, the relative inclination of which with respect to the transducing direction can be changed, to provide for infinitely variable overlap, and coverage of the width of the pattern, in zones of infinitely variable dimension.

Electro-optical measuring apparatus to cover zones of different widths

To avoid edge effects and local variations of differences in transducers across zones of material to be printed from which print control signals are to be derived, for example to control the localized or zone adjustment positions of a flexible doctor blade with respect to an ink ductor roller in an offset printing machine, a first standard sample providing, for example, white signals, is first scanned, then a standard sample, providing for example totally inked zones, is scanned, and then the actual printing sample. From each of the scannings, signals are derived with respect to print zones, for example columns in a newpaper layout, the signals being compared to form a difference or comparison signal from the first two standards (light and dark) in the respective zones, which difference signal is stored, with respect to the respective zones, in a file memory (11); this difference signal then is compared with processed transduced signals derived from the actual text to be printed, for conversion into output signals for display, storage or control of the printing machines in accordance with the respective ink coverage of the zones which were scanned.

Zonal ink distribution measuring method and system

Ink is picked up by an ink roller which has a surface characterized as consisting of a foamed plastic with pores open at the outer circumference but not interconnected. The ink roller dips into ink within an ink trough. The ink being applied to the ink roller is controlled by stripping elements formed as rollers which are pressed with controllable force against the surface of the ink pick-up roller; the force can be controlled, for example, by pneumatic or hydraulic fluid means, such as pressure piston-cylinder arrangements, blow-up pillows, or fluid pressure being applied against the roller mechanism directly; or by mechanical means, such as by a spring suspension in which the attachment points of the springs are selectively positionable. Preferably, the stripping rollers are about 1/15 or less of the diameter of the ink pick-up roller, and driven at a circumferential speed which is slow with respect to that of the ink pick-up roller. Ink can be transferred directly to a printing plate cylinder, or to ink transfer rollers. Both the ink pick-up roller and the stripping roller, preferably, are axially oscillating.

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Konigsbrunn, Germany

Hans E Mamberer