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公开(公告)号：US20190143694A1
公开(公告)日：2019-05-16
申请号：US16097983
申请日：2016-07-25
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Pere Tuset , Sheila Cabello , Xavier Vilajosana
CPC classification number: B41J2/165 , B41J2/04501 , B41J2/175 , B41J2/17596 , B41J2002/16502 , B41J2002/16594
Abstract: In an example, a printhead maintenance apparatus includes a pump, a current monitor and processing circuitry. The pump may be provided to increase a pressure in a printhead, and the current monitor may monitor a current consumption of the pump. The processing circuitry may determine a rate of change of current consumption of the pump, and compare the rate of change of current consumption to a predetermined threshold.
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公开(公告)号：US10539474B2
公开(公告)日：2020-01-21
申请号：US15562786
申请日：2015-07-21
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Xavier Vilajosana , Pere Tuset , Diego Javier Mostaccio
IPC: G01K13/10 , B33Y10/00 , B33Y30/00 , B33Y50/02 , B29C64/393 , B29C64/153
Abstract: In some examples, a method comprises sensing a temperature of a plurality of sub-regions of a portion of a layer of build material in an object generation apparatus. A frequency distribution of sub-region temperatures may be derived therefrom and it may be determined whether the frequency distribution is bimodal. If the frequency distribution is not bimodal, a build material temperature zone is identified. If however the frequency distribution is bimodal, a fusing build material temperature zone and a non-fusing build material temperature zone are identified. The method may further comprise determining a nominal temperature of the at least one identified temperature zone.
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Patent Agency Ranking
公开(公告)号：US20190092002A1
公开(公告)日：2019-03-28
申请号：US16097969
申请日：2016-07-25
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Pere Tuset , Xavier Vilajosana , Sheila Cabello
IPC: B41J2/045
Abstract: In an example, a print apparatus includes a printhead carriage to receive a printhead comprising a print agent ejection nozzle, a drop detector to acquire a signal indicative of variations in a parameter detected by the drop detector over a period of drop detection, a memory to hold a print agent ejection signature, and processing circuitry. The processing circuitry includes a convolution module to convolve the drop detector signal with the print agent ejection signature, and the processing circuitry is to determine, from an output of the convolution module, an indication of similarity between the drop detector signal and the print agent ejection signature.
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公开(公告)号：US20180052064A1
公开(公告)日：2018-02-22
申请号：US15562786
申请日：2015-07-21
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Xavier Vilajosana , Pere Tuset , Diego Javier Mostaccio
IPC: G01K13/10 , B29C64/393 , B33Y10/00 , B33Y50/02 , B33Y30/00
CPC classification number: G01K13/10 , B29C64/153 , B29C64/165 , B29C64/386 , B29C64/393 , B33Y10/00 , B33Y30/00 , B33Y50/02
Abstract: In some examples, a method comprises sensing a temperature of a plurality of sub-regions of a portion of a layer of build material in an object generation apparatus. A frequency distribution of sub-region temperatures may be derived therefrom and it may be determined whether the frequency distribution is bimodal. If the frequency distribution is not bimodal, a build material temperature zone is identified. If however the frequency distribution is bimodal, a fusing build material temperature zone and a non-fusing build material temperature zone are identified. The method may further comprise determining a nominal temperature of the at least one identified temperature zone.
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公开(公告)号：US11188275B2
公开(公告)日：2021-11-30
申请号：US15533514
申请日：2015-01-13
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Xavier Vilajosana , Pere Tuset , Pol Fornos
Abstract: In an example, a method of anticipating maintenance in a printing device includes determining an inertial reference signal of a printer carriage and measuring a current inertial signal of the printer carriage. The method includes cross-correlating the inertial reference signal with the current inertial signal and determining from the cross-correlating when the current inertial signal is not within a preset confidence interval of the inertial reference signal.
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公开(公告)号：US10427408B2
公开(公告)日：2019-10-01
申请号：US16097983
申请日：2016-07-25
Applicant: Hewlett-Packard Development Company, L.P.
Inventor： Pere Tuset , Sheila Cabello , Xavier Vilajosana
Abstract: In an example, a printhead maintenance apparatus includes a pump, a current monitor and processing circuitry. The pump may be provided to increase a pressure in a printhead, and the current monitor may monitor a current consumption of the pump. The processing circuitry may determine a rate of change of current consumption of the pump, and compare the rate of change of current consumption to a predetermined threshold.
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公开(公告)号：US20170344314A1
公开(公告)日：2017-11-30
申请号：US15533514
申请日：2015-01-13
Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventor： Xavier Vilajosana , Pere Tuset , Pol Fornos
Abstract: In an example, a method of anticipating maintenance in a printing device includes determining an inertial reference signal of a printer carriage and measuring a current inertial signal of the printer carriage. The method includes cross-correlating the inertial reference signal with the current inertial signal and determining from the cross-correlating when the current inertial signal is not within a preset confidence interval of the inertial reference signal.
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