Patents by Inventor Frank Muth
Frank Muth has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10603923Abstract: 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: GrantFiled: February 11, 2019Date of Patent: March 31, 2020Assignee: Heidelberger Druckmaschinen AGInventors: Johannes Muehl, Hans Koehler, Roland Stenzel, Andreas Henn, Martin Mayer, Steffen Neeb, Frank Muth, Jan Krieger, Nicklas Raymond Norrick, Mina Abosetta
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Patent number: 10589519Abstract: 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: GrantFiled: May 25, 2017Date of Patent: March 17, 2020Assignee: Heidelberger Druckmaschinen AGInventors: Frank Muth, Jan Krieger, Wolfgang Geissler
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Patent number: 10500842Abstract: A method calibrates image sensors and adjusts print heads in an inkjet printing machine via a computer. The method includes printing a test print chart, recording the printed test print chart via an image sensor to create a digital image, determining a coordinate transformation between the coordinates on the test print chart and the coordinates of the image sensor and the print heads, implementing a computer-assisted evaluation process of the digital image to determine the coordinates on the test print chart, deriving correction values for print head adjustment and camera calibration from results of the coordinate transformation and/or the comparison thereof with the determined measured values, and implementing the print head adjustment and the camera calibration by the computer. The test print chart has filled circular discs. The filled circular discs have a minimum diameter that is selected for them to function even if defective printing nozzles occur.Type: GrantFiled: September 12, 2018Date of Patent: December 10, 2019Assignee: Heidelberger Druckmaschinen AGInventors: Jan Krieger, Frank Muth
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Publication number: 20190248153Abstract: 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: ApplicationFiled: February 11, 2019Publication date: August 15, 2019Inventors: JOHANNES MUEHL, HANS KOEHLER, ROLAND STENZEL, ANDREAS HENN, MARTIN MAYER, STEFFEN NEEB, FRANK MUTH, JAN KRIEGER, NICKLAR RAYMOND NORRICK, MINA ABOSETTA
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Publication number: 20190077143Abstract: A method calibrates image sensors and adjusts print heads in an inkjet printing machine via a computer. The method includes printing a test print chart, recording the printed test print chart via an image sensor to create a digital image, determining a coordinate transformation between the coordinates on the test print chart and the coordinates of the image sensor and the print heads, implementing a computer-assisted evaluation process of the digital image to determine the coordinates on the test print chart, deriving correction values for print head adjustment and camera calibration from results of the coordinate transformation and/or the comparison thereof with the determined measured values, and implementing the print head adjustment and the camera calibration by the computer. The test print chart has filled circular discs. The filled circular discs have a minimum diameter that is selected for them to function even if defective printing nozzles occur.Type: ApplicationFiled: September 12, 2018Publication date: March 14, 2019Inventors: JAN KRIEGER, FRANK MUTH
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Patent number: 10214017Abstract: A method for detecting and compensating for failed printing nozzles in an inkjet printing machine by using a computer, includes printing a current print image, recording the printed print image by using an image sensor and digitizing the recorded print image by using the computer, adding digitized color values of the recorded print image of every column over the entire print image height and dividing the added-up color values by the number of pixels to obtain a column profile, subtracting an optimized column profile without failed printing nozzles from the original column profile to obtain a differential column profile, setting a maximum value threshold defining a failed printing nozzle when exceeded, applying that maximum value threshold to the differential column profile to obtain a resultant column profile every maximum of which marks a failed printing nozzle. The marked printing nozzles are compensated in a subsequent printing operation.Type: GrantFiled: December 11, 2017Date of Patent: February 26, 2019Assignee: Heidelberger Druckmaschinen AGInventors: Wolfgang Geissler, Martin Mayer, Frank Muth, Hans Koehler
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Publication number: 20180162134Abstract: A method for detecting and compensating for failed printing nozzles in an inkjet printing machine by using a computer, includes printing a current print image, recording the printed print image by using an image sensor and digitizing the recorded print image by using the computer, adding digitized color values of the recorded print image of every column over the entire print image height and dividing the added-up color values by the number of pixels to obtain a column profile, subtracting an optimized column profile without failed printing nozzles from the original column profile to obtain a differential column profile, setting a maximum value threshold defining a failed printing nozzle when exceeded, applying that maximum value threshold to the differential column profile to obtain a resultant column profile every maximum of which marks a failed printing nozzle. The marked printing nozzles are compensated in a subsequent printing operation.Type: ApplicationFiled: December 11, 2017Publication date: June 14, 2018Inventors: WOLFGANG GEISSLER, MARTIN MAYER, FRANK MUTH, HANS KOEHLER
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Publication number: 20180029856Abstract: A platform having a first ramp section and a second ramp section, each of the first and second ramp sections including a bottom surface having cleats and a top surface having a substantially level surface disposed between first and second ramp sections. The top surface includes a level top surface having a pair of recessed portions disposed in spaced apart relation between the first and second ramp sections. A pair of interlocking elements disposed at a junction plane between the pair of recessed portions is provided. The interlocking elements are adapted to lock and unlock to dispose the first and second ramp sections between an operable condition and a storage condition.Type: ApplicationFiled: July 25, 2017Publication date: February 1, 2018Applicant: CHAIN 'EM UP LLCInventor: Norman Frank Muth
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Publication number: 20170341371Abstract: 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: ApplicationFiled: May 25, 2017Publication date: November 30, 2017Inventors: FRANK MUTH, JAN KRIEGER, WOLFGANG GEISSLER
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Patent number: 7808676Abstract: A method for converting polarized color measured values to unpolarized color measured values or vice versa uses a computer. The conversion is carried out by the computer by using a pair of reference measured values determined in polarized and unpolarized form.Type: GrantFiled: May 30, 2008Date of Patent: October 5, 2010Assignee: Heidelberger Druckmaschinen AGInventors: Werner Huber, Frank Muth
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Publication number: 20080298825Abstract: A method for converting polarized color measured values to unpolarized color measured values or vice versa uses a computer. The conversion is carried out by the computer by using a pair of reference measured values determined in polarized and unpolarized form.Type: ApplicationFiled: May 30, 2008Publication date: December 4, 2008Applicant: HEIDELBERGER DRUCKMASCHINEN AGInventors: Werner Huber, Frank Muth
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Patent number: 7398733Abstract: Spectral, densitometric, or color measured values are detected on sheet printing materials during the printing process in a sheet-fed printing press. The measured values are determined on sheets as they are moving through the printing press and the measured values are used in real-time by a computer to control parameters for controlling the printing process in the sheet-fed printing press.Type: GrantFiled: November 3, 2006Date of Patent: July 15, 2008Assignee: Heidelberger Druckmaschinen AGInventors: Loris De Vries, Peter Ehbets, Peter Elter, Wolfgang Geissler, Werner Huber, Robert Lange, Frank Muth, Christopher Riegel, Manfred Schneider, Frank Schumann
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Patent number: 7334520Abstract: A printing press for processing sheet printing materials includes at least one printing unit, a computer and a measuring device for monitoring printing quality during a printing process. The measuring device has a sensing device for measuring by color or spectrally to register the printing material. At least one sheet-guiding element leads the sheet printing material past the sensing device. A measuring device for monitoring printing quality during a printing process in a printing press for processing sheet printing materials, is also provided.Type: GrantFiled: November 3, 2006Date of Patent: February 26, 2008Assignee: Heidelberger Druckmaschinen AGInventors: Wolfgang Geissler, Loris De Vries, Peter Ehbets, Robert Lange, Frank Muth, Christopher Riegel, Frank Schumann
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Publication number: 20070113748Abstract: A printing press for processing sheet printing materials includes at least one printing unit, a computer and a measuring device for monitoring printing quality during a printing process. The measuring device has a sensing device for measuring by color or spectrally to register the printing material. At least one sheet-guiding element leads the sheet printing material past the sensing device. A measuring device for monitoring printing quality during a printing process in a printing press for processing sheet printing materials, is also provided.Type: ApplicationFiled: November 3, 2006Publication date: May 24, 2007Inventors: Wolfgang Geissler, Loris De Vries, Peter Ehbets, Robert Lange, Frank Muth, Christopher Riegel, Frank Schuman
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Publication number: 20070079717Abstract: Spectral, densitometric, or color measured values are detected on sheet printing materials during the printing process in a sheet-fed printing press. The measured values are determined on sheets as they are moving through the printing press and the measured values are used in real-time by a computer to control parameters for controlling the printing process in the sheet-fed printing press.Type: ApplicationFiled: November 3, 2006Publication date: April 12, 2007Inventors: Loris De Vries, Peter Ehbets, Peter Elter, Wolfgang Geissler, Werner Huber, Robert Lange, Frank Muth, Christopher Riegel, Manfred Schneider, Frank Schumann
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Patent number: D873523Type: GrantFiled: November 9, 2018Date of Patent: January 21, 2020Assignee: CHAIN 'EM UP LLCInventor: Norman Frank Muth