Heidelberger Druckmaschinen Ag

Heidleberger Druckmaschinen Ag

Andreas Henn

Steffen Neeb

Nicklas Raymond Norrick

Thomas Wolf

Jens Forche

Andreas Fehlner

Willi Becker

Peter Hachmann

Martin Mayer

Thomas Schmidt

Joachim Sonnenschein

Josef Wehle

Andreas Schulz

Markus Gerstenberger

Olaf Lorenz

Tobias Mueller

Stefan Knauf

Juergen Ritz

Karl-Heinz Helmstaedter

Stefan Muench

Thomas Goebel

Wolfgang Kabus

Juergen Rautert

Markus Möhringer

Bernhard Wagensommer

Burkhard Maass

Christian Hieb

Stefan Mutschall

Peter Förch

Wolfgang Dolz

Hendrik Frank

Wolfgang Eberhard Luxem

Martin Schmitt-Lewen

Albert Maul

Hans Koehler

Immanuel Fergen

Tobias M&uuml;ller

Uwe Tessmann

Hans Butterfass

Jan Krieger

Frank Muth

Joachim Herrmann

Jürgen Rautert

Juergen Maass

Norbert Rodi

Thorsten Euler

Peter F&ouml;rch

Michael Seydel

Roland Stenzel

Karl-Heinz Walther

Nicolas Martin

Martin Haas

Johannes Muehl

Evgeny Kurmakaev

Marcel Mahner

Mina Abosetta

Annika Kamper

Stephanie Weinig-Kress

Christian Bull

J&ouml;rg Heuschkel

Jürgen Ritz

Stefan MÜNCH

Thomas GÖBEL

Jürgen Dr Rautert

Peter Dr Hachmann

Nicklas Norrick

Martin Dr Schmitt-Lewen

Immanuel Dr Fergen

A method for operating a printing material processing machine by using a computer includes acquiring print job parameters from print jobs for the printing material processing machine and machine parameters by using the computer, evaluating the acquired parameters to determine the machine state by using the computer, and requesting and providing fluid consumable materials for optimizing the operation of the machine on the basis of the determined machine state by using the computer. Maintenance measures carried out on the machine are optimized on the basis of the determined machine state, by using the computer.

Method for operating a printing material processing machine by applying a varnish consumption prediction

A device for controlling the printing operation in an inkjet printing machine includes at least one inkjet print head disposed at an adjustable distance from a substrate to be printed on. A device receives a print job and a bad sheet sensor has a trigger threshold. A machine control unit adjusts the distance between the inkjet print head and the substrate to be printed on as well as the trigger threshold of the bad sheet sensor before or after the printing operation as a function of a received print job.

Device for controlling an inkjet printing machine to provide a variable distance between an inkjet print head and a substrate

A method for detecting and compensating for defective print heads in an inkjet printing machine uses a computer to analyze printing nozzle test charts and/or area coverage elements to obtain characteristic values of individual printing nozzles in a print head, to calculate the failure probabilities of these printing nozzles on the basis of thresholds, and to compensate for a printing nozzle that exceeds a specified failure probability. The computer uses the individual failure probabilities of the individual printing nozzles in a print head to calculate the failure probability of the print head and initiates compensation measures as a function of the calculation. The thresholds correspond to a multi-dimensional characteristic value threshold based on which the computer calculates the failure probability of a printing nozzle by using an algorithm including kernel density estimation through a multidimensional distribution function.

Method for detecting and compensating for defective print heads in an inkjet printing machine by stochastic print head monitoring

A method detects defective print nozzles in an inkjet printing machine by a computer. In a first phase within the context of a print job, print nozzle test patterns are printed beside a subject on a printing substrate. These print nozzle test patterns are then digitized by an image sensor and sent to the computer, where they are analyzed by the computer to determine the current state of the print nozzles, including defective print nozzles. After the first phase, the print nozzle test patterns are modified by the computer on the basis of the current state of the print nozzles and, in a second phase, the modified print nozzle test patterns are printed, digitized and evaluated by the computer with regard to the determination of the current state of the print nozzles and defective print nozzles.

Method for detecting a defective print nozzle using a variable print nozzle test pattern

A method for detecting defective printing nozzles in an inkjet printing machine includes printing a multi-row printing nozzle test chart formed of horizontal rows of equidistant vertical lines periodically underneath one another, with only printing nozzles in a print head contributing to every row of the test chart corresponding to the horizontal rows. An area coverage element geometrically associated with the test chart is printed, both elements are recorded by an image sensor and analyzed by the computer. The computer analyzes the recorded area coverage element to detect print defects and allocates defects to a region of geometrically close printing nozzles. An analysis of the test chart in the region identifies nozzles causing the defect. Defective printing nozzles are detected based on thresholds, the detected printing nozzles are then compensated, and in the analysis of the recorded area coverage element, influences of the sensor are eliminated by shading correction.

Method for detecting defective printing nozzles in an inkjet printing machine

A method for detecting and compensating for defective printing nozzles in an ink jet printing machine by using a computer includes printing printing nozzle test charts next to an actual print in a production run, subsequently recording and digitizing the printed printing nozzle test charts by using at least one image sensor, evaluating recorded test charts and, based thereon, defining characteristic values for all printing nozzles contributing to the printed printing nozzle test charts by using the computer, calculating a failure probability for every contributing printing nozzle based on the determined characteristic values by applying a statistical prediction model using the computer, and switching off and compensating for all printing nozzles exceeding a first defined threshold for the calculated failure probability. A printing operation is then carried out on the ink jet printing machine with printing nozzle compensation.

Method for detecting and compensating for defective printing nozzles in an ink jet printing machine

A method for detecting and compensating defective printing nozzles in an inkjet printing machine includes periodically printing at least one printing nozzle test chart having horizontal rows of equidistant vertical lines underneath one another, with only nozzles contributing to the test chart in every row corresponding to horizontal rows, and printing an area coverage element geometrically associated with the test chart. Both elements are recorded by an image sensor and evaluated by a computer. The computer identifies print defects by evaluating the area coverage element and allocates the defects to defective nozzles. The computer evaluates the test chart based on thresholds to detect defective nozzles and compensate detected defective nozzles. The computer compares the detected defective nozzles from the area coverage element and the test chart to identify detected defective nozzles causing defects in only one element and calculates the thresholds based thereon to minimize the detected defective nozzles.

Method for detecting and compensating for defective printing nozzles in an inkjet printing machine using a threshold calculation based on weighting factors

A device detects at least one position of at least a part of a printing material while the printing material is transported in a printing machine. The device includes an optical sensor for establishing a distance between a printing machine component and the printing material. The distance established by the optical sensor is temperature-compensated by a computer.

Device for detecting a position of a printing material transported in a printing machine

A sheet-fed printing press includes a printing cylinder and a high-precision sensor system for monitoring a sheet run in the area of the printing cylinder. At least one gage, which is mounted on the printing cylinder, can be detected by the sensor system. It is particularly advantageous if the sensor system is configured to be self-calibrating. A method for calibrating a sensor system and a method for aligning a sensor system are also provided.

Sheet-fed printing press with a sensor system and methods for calibrating and for aligning the sensor system

A method and a device for producing and transferring diffractive microstructures to a printing material include applying a fluid to an embossing cylinder and there, during the rotation of the embossing cylinder, solidifying the fluid to such an extent that the fluid is transferred to a printing material in the manner of a film with a solidified microstructure. The embossing cylinder has a cover which is preferably constructed to be either soft as a 'flexoshim' or hard as a 'nickel shim.' A web-fed or sheet-fed rotary printing press having the device is also provided.

Method and device for producing and transferring diffractive microstructures to a printing material and printing press having the device

A sheet-fed offset printing press prints multiple colors on both sides of sheets, preferably on sheets of paper. A first row of in-line printing units print a first side of the sheet, before the sheets are turned in a reversing device, which is followed by a second row of in-line printing units for printing the other side of the sheets. The second row of in-line printing units is followed by one or more varnishing units that are arranged in such a way or include varnishing blanket cylinders that are arranged in such a way that the front sides and the back sides of the passing sheets are varnished.

Sheet-fed offset printing press and method of two-sided multi-color printing

In a method and an apparatus for feeding sheets to a sheet-processing machine, the leading edge of the sheet is smoothed before the grippers are closed by further transport into the sheet-processing machine. A curvature or bend in the sheet transport direction is imparted to the sheet. The feed table has, in its feeder region, a curvature in the sheet transport direction, against which curvature the sheet leading edge is laid with the aid of pneumatic or mechanical devices.

Method of feeding sheets to a sheet-processing machine, sheet-smoothing method and device

A device for aligning sheets prior to transferring the sheets to a sheet-processing machine includes at least one sheet-gripping device by the aid of which the sheet to be aligned is displaceable, the sheet-gripping device having at least one positioning table displaceable by an actuating drive in at least one of a sheet travel direction, transversely to the sheet travel direction, and in a direction wherein it is pivoted about an axis extending in a direction orthogonal to the sheet travel direction, the sheet to be aligned being fixable on the positioning table; and a method for aligning sheets by the device.

Device and method for aligning sheets

A printing press for one-sided or two-sided printing of a sheet includes a transfer cylinder disposed in a travel direction of the sheet between a first and a second impression cylinder, respectively, of two printing units, and a sheet support assigned to the transfer cylinder for receiving the sheet thereon before the sheet is transferred to the second impression cylinder, an inverting drum disposed in the travel direction of the sheet between the sheet support and the second impression cylinder, the inverting drum serving for picking up the sheet from the sheet support and transporting the sheet to the second impression cylinder; and a method of operation.

Printing machine and method for printing a sheet

A method of aligning sheets prior to transferring them to a sheet-processing machine includes feeding a respective sheet, by a first sheet edge thereof, against a stop; gripping the sheet by at least one sheet holder, and displacing the sheet holder at least approximately transversely to the stop in a direction towards a first control region; and onwardly moving the sheet holder, while the sheet is held thereby, over a given first distance, after a second sheet edge has reached the first control region; and a device for performing the method.

Method and device for aligning sheets

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Neckargemuend, Germany

Andreas Henn