Patents by Inventor Ulrich Stoeckle

Ulrich Stoeckle 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).

  • Publication number: 20200079080
    Abstract: In preparation for an ejection pulse for printing a dot in a subsequent line, the actuator of a nozzle of an inkjet printer is activated in a current line with an excitation pulse via which no ink ejection is produced although an oscillation of ink in the nozzle is produced. The oscillation that is produced by the excitation pulse is thereby matched to the ejection pulse such that the ink droplets that are ejected by the ejection pulse in the subsequent line at least approximately has a defined target droplet velocity. The droplet velocity of the ejected ink droplets, and thus the droplet positioning, may thus be made uniform via the use of excitation pulses.
    Type: Application
    Filed: September 6, 2019
    Publication date: March 12, 2020
    Applicant: Océ Holding B.V.
    Inventors: Ulrich Stoeckle, Florian Hitzlsperger
  • Patent number: 10538102
    Abstract: A degassing device can include one or more passive components, such as a gas-permeable membrane. The passive components may not directly be monitored. The state (e.g. the permeability) of the passive components may be reliably determined via evaluation of pressure information with regard to the pressure (e.g. negative pressure) in the degassing device.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: January 21, 2020
    Assignee: Océ Holding B.V.
    Inventors: Ulrich Stöckle, Stefan Adelsperger
  • Publication number: 20190389205
    Abstract: The droplet velocities of the nozzles of different groups of nozzles of a print head of an inkjet printing device are determined for different line clock rates. An optimized operating line clock rate is then determined for the operation of the printing device, where the deviation between the droplet velocities of the nozzles of the different groups is reduced (e.g. minimized). The droplet positioning along the transport direction of a recording medium may be advantageously homogenized via the convergence of the droplet velocities.
    Type: Application
    Filed: June 26, 2019
    Publication date: December 26, 2019
    Applicant: Océ Holding B.V.
    Inventor: Ulrich Stoeckle
  • Patent number: 10406832
    Abstract: A method to increase the print quality of a printer can include determining sensor data corresponding to a print image printed by a print head of the at least one print head of the printer onto the recording medium; determining, based on the sensor data, undulation information corresponding to unevenness of the recording medium, a distance between the one or more nozzles of the print head of the printer and the recording medium varying due to the unevenness; and printing, based on the undulation information, a subsequent print image with the print head of the printer. The printer can include at least one print head including one or more nozzles that are configured to fire ink droplets onto a recording medium to generate a print image on the recording medium.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: September 10, 2019
    Assignee: Océ Holding B.V.
    Inventor: Ulrich Stoeckle
  • Patent number: 10391766
    Abstract: In a method to active print nozzles of an inkjet printer including a print head having print nozzles and respective actuators associated with each of the print nozzles, one or more conveying pulses are generated to eject respective droplets of ink from the respective print nozzle; and the actuator is activated with one or more intermediate pulses having an amplitude and/or a duration that is less than an amplitude and/or a duration of the one or more conveying pulses. The one or more intermediate pulses can be configured such that no ink is ejected from the respective print nozzle with the one or more intermediate pulses.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: August 27, 2019
    Assignee: Océ Holding B.V.
    Inventors: Ulrich Stoeckle, Philippe Koerner
  • Publication number: 20190143708
    Abstract: A degassing device can include one or more passive components, such as a gas-permeable membrane. The passive components may not directly be monitored. The state (e.g. the permeability) of the passive components may be reliably determined via evaluation of pressure information with regard to the pressure (e.g. negative pressure) in the degassing device.
    Type: Application
    Filed: November 15, 2018
    Publication date: May 16, 2019
    Applicant: Océ Holding B.V.
    Inventors: Ulrich Stöckle, Stefan Adelsperger
  • Publication number: 20190111675
    Abstract: An inkjet printer having at least one print head in which at least one edge region nozzle at the edge of the print head is not activated for the printing of a print image, but nevertheless is activated at least temporarily with non-ejection pulses without ink ejection. Intensity fluctuations of the dots of a print image that are printed by the remaining nozzles of the print head may be reduced via the activation of an edge region nozzle with non-ejection pulses.
    Type: Application
    Filed: October 17, 2018
    Publication date: April 18, 2019
    Applicant: Océ Holding B.V.
    Inventors: Ulrich Stoeckle, Uwe Hofmann, Hans Gollatz, Lars Joergens
  • Patent number: 10099474
    Abstract: In a method to check a fixative print head for nozzle failures, a reference mark is printed by the nozzles of a colored ink print head and a test mark is printed via overprinting of the colored ink by the nozzles of the colored ink print head and of a fixative by the nozzles of the fixative print head onto a printing substrate web. The test mark and the reference mark are compared with one another. If the reference mark and the test mark correspond to one another (e.g., at least in part), this indicates that nozzles of the fixative print head are operating incorrectly. If operating incorrectly, the nozzles have, for example, failed entirely or eject the fixative at too great an angular deviation.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: October 16, 2018
    Assignee: Océ Holding B.V.
    Inventors: Ulrich Stoeckle, Philippe Koerner
  • Patent number: 10059095
    Abstract: A method for reducing a locally increased viscosity of ink in an ink print head of an ink printer during printing operation includes: a determination of a printing pause with the aid of a pixel preview; an application of a first sequence of pulses for measurement of the activation current of a piezoelement of the ink print head; and an application of a second sequence of pulses for vibration of the ink meniscus at the exit of a nozzle if the ink print head to intermix the ink having locally increased viscosity with ink having the initial viscosity given a threatened failure of the nozzle.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: August 28, 2018
    Assignee: Océ Printing Systems GmbH & Co. KG
    Inventors: Philippe Koerner, Ulrich Stoeckle
  • Publication number: 20180170043
    Abstract: In a method to active print nozzles of an inkjet printer including a print head having print nozzles and respective actuators associated with each of the print nozzles, one or more conveying pulses are generated to eject respective droplets of ink from the respective print nozzle; and the actuator is activated with one or more intermediate pulses having an amplitude and/or a duration that is less than an amplitude and/or a duration of the one or more conveying pulses. The one or more intermediate pulses can be configured such that no ink is ejected from the respective print nozzle with the one or more intermediate pulses.
    Type: Application
    Filed: December 12, 2017
    Publication date: June 21, 2018
    Applicant: Océ Holding B.V.
    Inventors: Ulrich Stoeckle, Philippe Koerner
  • Publication number: 20180147861
    Abstract: A method to increase the print quality of a printer can include determining sensor data corresponding to a print image printed by a print head of the at least one print head of the printer onto the recording medium; determining, based on the sensor data, undulation information corresponding to unevenness of the recording medium, a distance between the one or more nozzles of the print head of the printer and the recording medium varying due to the unevenness; and printing, based on the undulation information, a subsequent print image with the print head of the printer. The printer can include at least one print head including one or more nozzles that are configured to fire ink droplets onto a recording medium to generate a print image on the recording medium.
    Type: Application
    Filed: November 29, 2017
    Publication date: May 31, 2018
    Applicant: Océ Holding B.V.
    Inventor: Ulrich Stoeckle
  • Publication number: 20180126758
    Abstract: In a method for an inkjet printing system, substantially parallel lines are printed in the transport direction with nozzles at different longitudinal positions along the transport direction of the recording medium. Based on the variations of the transversal distance of corresponding image points of the substantially parallel lines, the transversal movement of the recording medium may be detected and a dimension of the transversal movement may be determined.
    Type: Application
    Filed: October 30, 2017
    Publication date: May 10, 2018
    Applicant: Océ Holding B.V.
    Inventors: Marko Mihailovic, Claus Schneider, Philippe Koerner, Ulrich Stoeckle
  • Publication number: 20180029360
    Abstract: In an a method to stabilize the ink meniscus at a nozzle opening of a nozzle of a print head including the nozzle and one or more adjacent nozzles to the nozzle, the nozzle can be induced to generate a signal pulse at an activation time. The signal pulse can be a pre-fire pulse (e.g. a negative pressure reduction pulse), where, for example, no ink is ejected. The inducement to generate the pulse can depend on the number of adjacent nozzles that eject ink at the activation time. The negative pressure in the nozzle can then be reduced, and nozzle failures due to air suction may be avoided.
    Type: Application
    Filed: July 27, 2017
    Publication date: February 1, 2018
    Applicant: Océ Holding B.V.
    Inventor: Ulrich Stoeckle
  • Publication number: 20170246856
    Abstract: In a method to check a fixative print head for nozzle failures, a reference mark is printed by the nozzles of a colored ink print head and a test mark is printed via overprinting of the colored ink by the nozzles of the colored ink print head and of a fixative by the nozzles of the fixative print head onto a printing substrate web. The test mark and the reference mark are compared with one another. If the reference mark and the test mark correspond to one another (e.g., at least in part), this indicates that nozzles of the fixative print head are operating incorrectly. If operating incorrectly, the nozzles have, for example, failed entirely or eject the fixative at too great an angular deviation.
    Type: Application
    Filed: February 24, 2017
    Publication date: August 31, 2017
    Applicant: Océ Holding B.V.
    Inventors: Ulrich Stoeckle, Philippe Koerner
  • Patent number: 9662879
    Abstract: A method for stabilizing a print quality in an inkjet printing system is described. The inkjet printing system can include a nozzle arrangement that may be activated with a number of control signals that can be used to fire ink droplets with corresponding different droplet sizes onto a recording medium. In the method for stabilizing a print quality in an inkjet printing system, a rastered image for an image template can be created. The rastered image can be printable by the inkjet printing system using a subset of the different droplet sizes. Further, the nozzle arrangement can be activated with a control signal for an unused droplet size of the different droplet sizes to induce the nozzle arrangement to generate a prefire pulse.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: May 30, 2017
    Assignee: Océ Printing Systems GmbH & Co. KG
    Inventors: Ulrich Stoeckle, Harald Myllek, Philippe Koerner, Werner Zollner
  • Publication number: 20170096002
    Abstract: A method for reducing a locally increased viscosity of ink in an ink print head of an ink printer during printing operation includes: a determination of a printing pause with the aid of a pixel preview; an application of a first sequence of pulses for measurement of the activation current of a piezoelement of the ink print head; and an application of a second sequence of pulses for vibration of the ink meniscus at the exit of a nozzle if the ink print head to intermix the ink having locally increased viscosity with ink having the initial viscosity given a threatened failure of the nozzle.
    Type: Application
    Filed: September 28, 2016
    Publication date: April 6, 2017
    Applicant: Océ Printing Systems GmbH & Co. KG
    Inventors: Philippe Koerner, Ulrich Stoeckle
  • Publication number: 20160257112
    Abstract: A method for stabilizing a print quality in an inkjet printing system is described. The inkjet printing system can include a nozzle arrangement that may be activated with a number of control signals that can be used to fire ink droplets with corresponding different droplet sizes onto a recording medium. In the method for stabilizing a print quality in an inkjet printing system, a rastered image for an image template can be created. The rastered image can be printable by the inkjet printing system using a subset of the different droplet sizes. Further, the nozzle arrangement can be activated with a control signal for an unused droplet size of the different droplet sizes to induce the nozzle arrangement to generate a prefire pulse.
    Type: Application
    Filed: March 4, 2016
    Publication date: September 8, 2016
    Applicant: Oce Printing Systems GmbH & Co. KG
    Inventors: Ulrich Stoeckle, Harald Myllek, Philippe Koerner, Werner Zollner