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公开(公告)号：US20220126571A1
公开(公告)日：2022-04-28
申请号：US17419345
申请日：2019-07-15
Applicant: Hewlett-Packard Development Company, L.P.
Abstract: In an example, a printing apparatus includes a controller, wherein the controller may be to compare a historic usage of a first printhead nozzle with a historic usage of a second printhead nozzle which is located on a same printhead as the first nozzle. The controller may be to determine that the historic usage of the first nozzle is higher than the historic usage of the second nozzle, and in response identify a currently operational third printhead nozzle, for which the second nozzle is able to compensate; and turn off the third nozzle, and operate the second nozzle at a higher firing frequency to compensate for the third nozzle.
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公开(公告)号：US20220024202A1
公开(公告)日：2022-01-27
申请号：US17311617
申请日：2019-01-30
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Abstract: There is disclosed a printhead control method, printhead controller and printer. The method may comprise determining whether ink drop variability is likely to occur based on a first time period in which a printhead is uncovered during a print action but before printing begins, and a second time period that is a minimum period for ink drop variability to occur when the printhead is uncovered. The method may further comprise setting a printhead firing frequency for the print action based on the determination.
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公开(公告)号：US10744757B2
公开(公告)日：2020-08-18
申请号：US16327392
申请日：2016-10-26
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Antonio Gracia Verdugo , Pau Costal , David Toussaint
IPC: B41J2/045 , B41J2/175 , B29C64/112 , B41J29/38 , B41J2/21
Abstract: A printer includes a print head to print by ejecting drops of a printing fluid;, a memory to store a correction measure, the correction measure to modify printing a pattern to compensate for decel, and a processor. The processor analyzes print data for a pattern that, when printed using the print head, triggers decel, controls the print head to eject drops of the printing fluid in accordance with the print data, when the analysis indicates that the pattern to be printed triggers decel, applies the correction measure upon printing the pattern, and, when the analysis indicates that the pattern to be printed does not trigger decel, does not apply the correction measure upon printing the pattern.
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公开(公告)号：US10532588B2
公开(公告)日：2020-01-14
申请号：US15573196
申请日：2015-07-17
Applicant: Hewlett-Packard Development Company, L.P.
Abstract: Provided in one example is a printing system that has a printing zone with a platen (10), a drive, a suction force generator (18), a media advance sensor (26) to monitor movement of the medium through the printing zone in a medium advance direction, and a controller 28) to perform suction force calibration prior to printing. The suction force calibration includes controlling the drive to cause movement of the medium from an initial position at least partly through the printing zone while the suction force generator is controlled to generate at least one suction force level, determining a suction force level to be used during printing on the medium based on the output of the media advance sensor during the movement, and moving the medium back to the initial position.
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公开(公告)号：US10525739B2
公开(公告)日：2020-01-07
申请号：US16079524
申请日：2016-04-20
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Aleix Fort Filgueira , Simone Micheli , Antonio Gracia Verdugo
IPC: B41J11/00
Abstract: In certain examples, a printing device comprises a print head, a dryer, a heat exchanger, a distribution system and a controller. The heat exchanger is coupled to an exhaust of the dryer to produce pre-heated air. The distribution system is coupled to the heat exchanger and a plurality of regions of the printing device. The controller causes the distribution system to distribute the pre-heated air from the heat exchanger among the plurality of regions based on an operating parameter of the printing device.
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Patent Agency Ranking
公开(公告)号：US10341534B2
公开(公告)日：2019-07-02
申请号：US15503837
申请日：2014-08-26
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Juan Uroz Soria , Pere Gasparin Talarn , Antonio Gracia Verdugo
Abstract: Example implementations relate to color compensation. Some examples may print a calibration target background on a non-opaque media. The calibration target background may have a color that increases a dynamic range of a set of color measurements of a calibration target foreground. Some examples may print the calibration target foreground over the calibration target background. Additionally, some examples may measure an optical density of the calibration target foreground with a reflective sensor and may calibrate a printer based on the measured optical density.
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公开(公告)号：US09944091B2
公开(公告)日：2018-04-17
申请号：US15275964
申请日：2016-09-26
Applicant: Hewlett-Packard Development Company, L.P.
CPC classification number: B41J11/0015 , B41J2/01 , B41J2/21 , B41J2/2114 , B41J2/2132
Abstract: A printer control section arranged to control a printhead, is operable to cause the printhead to: perform a plurality of passes over a swath of a print medium, the plurality of passes including first and second treatment passes; apply treatment to the print medium in each of the treatment passes, the treatment in each treatment pass being applied according to a respective treatment mask, wherein each treatment mask indicates a corresponding set of pixels to which the treatment may be applied in a pass to which the treatment mask is applied, the treatment mask having a weight indicative of the proportion of pixels in the corresponding set of pixels, and the treatment masks of the first and second passes are such that a weight of the first treatment mask is different from a weight of the second treatment mask.
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公开(公告)号：US20180001626A1
公开(公告)日：2018-01-04
申请号：US15544400
申请日：2015-02-27
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Mauricio Seras Franzoso , Antonio Gracia Verdugo , Marta Coma Vives
CPC classification number: B41J2/04561 , B41J2/0451 , B41J2/0458 , B41J2/04581 , B41J2/11 , B41J2/125 , B41J2/135 , B41J2/165 , B41J2/16579 , B41J2/2139 , B41J2/2142
Abstract: Examples associated with drop velocity aberrancy detection are disclosed. One example includes firing ink through nozzles of a print-head past sensors to identify drop velocities of the nozzles. A target drop velocity is selected based on the drop velocities of the nozzles. An aberrant nozzles is detected when a nozzle has a drop velocity that deviates from the target drop velocity by a selected threshold. The aberrant nozzle is deactivated, and a good nozzle that will travel over locations traversed by the aberrant nozzle is configured to print portions of a job that would have been printed by the aberrant nozzle.
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公开(公告)号：US20170266963A1
公开(公告)日：2017-09-21
申请号：US15615219
申请日：2017-06-06
Applicant: Hewlett-Packard Development Company, L.P.
CPC classification number: B41J2/04551 , B41J2/04553 , B41J2/0458 , B41J2/04581 , B41J2/04586 , B41J2/165 , B41J2/16508 , B41J2/16517 , B41J2/1652 , B41J2/16526 , B41J2/16579 , B41J2002/16561 , B41J2002/16573
Abstract: In some examples, a method includes, in response to a fluid firing unit being operated according to a normal printing mode, applying a first voltage to the fluid firing unit to fire the fluid firing unit during a printing operation. The method further includes determining, using a sensor, whether a predetermined condition is met, and in response to determining that the predetermined condition is met, operating the fluid firing unit according to a recovery mode in which a second voltage higher than the first voltage is applied to the fluid firing unit to clean the fluid firing unit.
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公开(公告)号：US20170259582A1
公开(公告)日：2017-09-14
申请号：US15329956
申请日：2014-07-31
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Antonio Gracia Verdugo , Marina Cantero Lazaro , Mauricio Seras
CPC classification number: B41J2/2146 , B41J2/04508 , B41J2/04543 , B41J2/15 , B41J2/155 , B41J2/2103 , B41J2/2132 , B41J2/5056
Abstract: A method of printing a pattern from at least two rows of fluid ejection nozzles, said nozzles ejecting a first fluid in a multi-pass printing mode, the method comprising: dividing the pattern to be printed between the rows of fluid ejection nozzles; applying masks to the rows of fluid ejection nozzles for printing with selected nozzles of each of the rows of fluid ejection nozzles during each pass; wherein a first mask for printing from a first row of fluid ejection nozzles during an n-th pass is different from a second mask for printing from a second row of fluid ejection nozzles during said n-th pass.
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