Patents Assigned to Heidelberger Druckmaschinen
  • Patent number: 10737516
    Abstract: A device for adjusting print heads, in particular inkjet print heads of an inkjet printing machine, on a print bar includes motors disposed in a row and supported for joint movement. Every motor carries a motor gearwheel and every motor gearwheel is successively engageable with at least two respective adjustment gearwheels.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: August 11, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventor: Andreas Mueller
  • Patent number: 10737505
    Abstract: A method for alternately operating an inkjet printing machine applying a plurality of inks to a printing material in accordance with a print image, includes conveying the printing material at a conveying speed. A switch is made between the following two modes, a 1st mode of printing an n-color first print job at a first conveying speed and at a print resolution using n inks, i.e. using black ink and n?1 different chromatic inks; and a 2nd mode of printing a reduced-color second print job at a second conveying speed greater than the first conveying speed and at the same print resolution using the n inks. The printing speed and thus the number of prints produced per unit of time in a machine can therefore advantageously be increased.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: August 11, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventor: Peter Hachmann
  • Patent number: 10717301
    Abstract: A printing machine for printing on a web includes a first roller and a second roller between which the web forms a loop. A trough for pneumatically guiding the loop equidistantly to the major part of the length of curvature of the trough is provided between the first roller and the second roller.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: July 21, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventor: Peter Hachmann
  • Patent number: 10696062
    Abstract: A method for compensating for defective printing nozzles in an inkjet printing machine by way of a computer. Defective printing nozzles are compensated for by an increased ink drop volume of neighboring printing nozzles and the real positions of the print dots of all printing nozzles are determined and, to compensate for a printing nozzle failure, the required ink drop volumes of the respective neighboring printing nozzles are calculated for every printing nozzle as a function of the real positions of the print dots of the respective neighboring printing nozzles. In addition to increased ink drop volumes of the respective neighboring printing nozzles, reduced ink drop volumes are calculated for the respective next but one printing nozzles and all ink drop volumes are calculated based on the print dots of the respective printing nozzles.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: June 30, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Axel Hauck, Martin Mayer, Ilias Trachanas
  • Patent number: 10675885
    Abstract: A printing device includes an ink jet print head having individually controllable nozzles for jetting ink drops. An ink line connected to a chamber has a feed and/or return line for the print head. The print head, ink line and chamber move jointly relative to printing material. The ink line is part of a circulation ink supply system for the print head. A mass element associated with the chamber has a position and/or shape relative to the chamber changing as a function of the joint movement so that the chamber volume is a function of the position and/or shape of the mass element to compensate for pressure fluctuations and/or movements of the ink and avoid problems in the ink supply system for a print head in industrial, high-performance ink jet printing and in cooperation with circulation ink supply systems conveying large volumes of ink.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: June 9, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Andreas Mueller, David Ehrbar
  • Patent number: 10681248
    Abstract: A method for inkjet printing machine color control includes color transformation of print data from first color space to process color space in a first stage using a computer transforming print data from the first to an intermediate color space while keeping special colors, and a second stage transforming corrected print data including special colors from intermediate to process color space. The computer uses print data corrected after the first stage as second stage starting values. Print data transformed into the process color space are printed. First color space corresponds to CMYK, flexographic printing or RGB color space with special colors, intermediate color space corresponds to CMYK color space with special colors, process color space corresponds to CMYK color space with additional process colors. The computer corrects CMY, not K print data or special not transformed colors, when correcting print data in the intermediate color space after the first stage.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: June 9, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Boris Von Neindorff, Peter Weinholz
  • Patent number: 10661571
    Abstract: A print bar for inkjet printing includes a crossbar carrier, a row of head mounts carried by the crossbar carrier, and print heads held by the head mounts. Every head mount has lateral guide profiles for linearly guiding the head mounts. The guide profiles of respective adjacent or neighboring head mounts engage in one another.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: May 26, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Andreas Mueller, Burkhard Wolf
  • Patent number: 10647110
    Abstract: A method detects defective printing nozzles in an inkjet printing machine having a computer. The method includes printing a multi-row nozzle test chart for detection purposes, the test chart contains a number of horizontal rows of equidistant vertical lines printed periodically and disposed underneath one another. Wherein in every row of the nozzle test chart periodically only those respective printing nozzles of the print head contribute to the first element of the nozzle test chart that correspond to the specified number of the horizontal rows. An area coverage element geometrically associated with the nozzle test chart is printed. Both elements are recorded by an image sensor and both elements are evaluated by the computer. Defective printing nozzles are identified by evaluating the recorded nozzle test chart by the computer. Defects are allocated in the area coverage element to the printing nozzles in the nozzle test chart by the computer.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: May 12, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Johannes Muehl, Hans Koehler
  • Patent number: 10632773
    Abstract: A mounting device for a print head and a printing system allows print heads to be easily changed and easily and reliably adjusted. The mounting device includes a rigid mount and a frame for receiving a print head. The frame is releasably fixed to the rigid mount and includes an adjustment device for adjusting the print head relative to the rigid mount. The adjustment device of the frame includes two solid body joints and two actuators for adjusting the print head in two degrees of freedom, namely in a sliding movement along the rigid mount and a rotary movement about the vertical axis.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: April 28, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Andreas Mueller, Burkhard Wolf
  • Patent number: 10625499
    Abstract: 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.
    Type: Grant
    Filed: July 11, 2019
    Date of Patent: April 21, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Steffen Neeb, Nicklas Raymond Norrick, Andreas Henn, Jens Forche, Andreas Fehlner
  • Patent number: 10623605
    Abstract: A method for image inspection of printed products in a printing material processing machine includes using an image sensor to capture and digitize printed products during image inspection by an image capture system, using a computer to carry out a comparison of captured digital printed images with a digital reference image, examining a result of the comparison for image regions with blurry regions in the captured digital printed image, calculating suitable smoothing factors for the blurry image regions, and then carry out smoothing of the digital reference image with the calculated, suitable smoothing factors for the blurry image regions, causing the digital reference image to have a blurriness comparable to the captured digital printed image in the image regions. Printed products detected as faulty are removed upon an occurrence of deviations of the captured digital printed image from the digital reference image.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: April 14, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Immanuel Fergen, Frank Schumann
  • Patent number: 10611175
    Abstract: A method for printing tracks on bodies by using inkjet printing provides printed images with a homogeneous appearance on the bodies, in particular when printing large single-color areas. The homogeneous appearance is obtained by reducing the intensity of the UV radiation from at least one inkjet print head when pinning in track connection regions.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: April 7, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventor: Silas Falter
  • Patent number: 10603900
    Abstract: 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.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: March 31, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Andreas Fehlner, Thomas Wolf, Andreas Henn, Steffen Neeb, Nicklas Raymond Norrick, Jens Forche
  • Patent number: 10603923
    Abstract: 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.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: March 31, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Johannes Muehl, Hans Koehler, Roland Stenzel, Andreas Henn, Martin Mayer, Steffen Neeb, Frank Muth, Jan Krieger, Nicklas Raymond Norrick, Mina Abosetta
  • Patent number: 10596808
    Abstract: A method for modifying color density values in a dot-based printing system uses a control unit. The control unit implements the modification of the color density values after a raster image has been created and modifies the number and/or size of print dots to be applied to a printing substrate in order to attain pre-defined color density target values.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: March 24, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Ilias Trachanas, Gerd Junghans
  • Patent number: 10596806
    Abstract: 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.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: March 24, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Steffen Neeb, Nicklas Raymond Norrick, Andreas Henn, Andreas Fehlner, Thomas Wolf, Jens Forche
  • Patent number: 10589519
    Abstract: A method for detecting printing nozzle errors in an inkjet printing machine provides a high degree of robustness in the detection of errors by printing a nozzle test pattern in the inkjet printing machine. The test pattern is then digitalized by using a camera and transmitted to a computer for evaluation. There, the recorded test pattern is investigated by using methods of digital image processing, such as a Fourier analysis, and evaluated in the frequency range with regard to specific anticipated printing nozzle errors. Specific printing nozzle errors can be detected especially on the basis of amplitude, phase and variance errors in the signal in the frequency range. Moreover, by using the phase error, it is possible to evaluate whether the two print heads are disposed in an incorrect adjustment position relative to one another by calculating displacements of the phase error in transition regions of two print heads.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: March 17, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Frank Muth, Jan Krieger, Wolfgang Geissler
  • Patent number: 10576750
    Abstract: A method for compensating for disruption torques in driving a jetting cylinder in an inkjet printing machine includes recording print image products for at least one color and at least one complete rotation of the jetting cylinder by using an image sensor and using a computer for a time parallel measurement of a driving torque of the jetting cylinder, generating an average gray value profile above a circumferential coordinate based on the recorded image data by using the computer, transforming the average gray value profile and the measured profile of the driving torque into a frequency range by using a computer-assisted Fourier transform and extracting order components from the frequency range. A periodic compensation torque is calculated based on the extracted order components, and the calculated periodic compensation torque is factored-in when actuating the jetting cylinder of the inkjet printing machine in the course of a printing operation.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: March 3, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Steffen Neeb, Nicklas Raymond Norrick, Alexander Sendobry
  • Patent number: 10569583
    Abstract: A method for the automated calibration of a printing machine with an image capture system by using a computer, includes putting at least one printed sample substrate with defined deviations into the printing machine, generating a digital image of the printed sample substrate by using the image capture system, calculating current compensation values including defined deviations for configuration parameters of the printing machine relating to optimizing the printing quality by using the computer, and comparing the current compensation values created with target compensation values known from the defined deviations of the printed sample substrate. Serviceability of the printing machine is checked by evaluating the comparison by the computer and/or calibrating the printing machine by using the evaluated comparison by the computer.
    Type: Grant
    Filed: December 6, 2018
    Date of Patent: February 25, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Alexander Knabe, Manfred Schneider
  • Patent number: 10549545
    Abstract: 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.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: February 4, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Steffen Neeb, Nicklas Raymond Norrick, Andreas Henn, Andreas Fehlner, Thomas Wolf