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    Printing fluid recirculation
    12.
    发明授权
    Printing fluid recirculation 有权

    公开(公告)号：US10899136B2

    公开(公告)日：2021-01-26

    申请号：US16335974

    申请日：2017-01-24

    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

    Inventor： David Butinya ,  Marta Coma Vives ,  Joan-Albert Miravet

    IPC: B41J2/175 ,  B41J2/18

    Abstract: A printing device comprises a printing fluid supply; a plurality of printheads connected in parallel to the supply by a first flow path and a second flow path; a first fluid pressure source to create a negative fluid pressure between the supply and the first openings; a second fluid pressure source to create a positive fluid pressure between the supply and the second openings; and a controller. Each printhead comprises a closable first opening connected to the first flow path and a closable second opening connected to the second flow path, and has an associated mechanism to increase a fluid pressure in the printhead. Each first opening is to open in response to operation of the associated mechanism. The controller is to identify a first printhead for which printing fluid in the first printhead is to be recirculated; and operate the mechanism associated with the identified printhead.

    Printhead maintenance
    13.
    发明授权
    Printhead maintenance 有权

    公开(公告)号：US10562307B2

    公开(公告)日：2020-02-18

    申请号：US15763949

    申请日：2016-01-29

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Marta Coma Vives ,  María Dinares Argemi ,  David Butinya ,  Macia Solé Pons

    IPC: B41J25/316 ,  B41J2/165 ,  B41J2/21

    Abstract: Example methods for the maintenance of printheads are provided, the printheads comprising a reservoir containing a printing fluid with particles in suspension, and a nozzle plate. Example methods may comprise capping the nozzle plate of the printhead, and rotating the capped printhead. Example maintenance devices for printheads are also provided, comprising a support with a socket to attach a printhead to the support, a drive unit to rotate the support about a rotation axis, and a control unit connected to the drive unit to perform a predetermined rotation cycle.

    Printing fluid recirculation
    17.
    发明授权
    Printing fluid recirculation 有权

    公开(公告)号：US11772385B2

    公开(公告)日：2023-10-03

    申请号：US17417724

    申请日：2019-05-28

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： David Butinya Teixido ,  Albert Crespi Serrano ,  Marta Coma Vives ,  Jorge Millan Lafuente

    IPC: B41J2/18 ,  B41J2/17 ,  B41J2/175

    CPC classification number: B41J2/18 ,  B41J2/175 ,  B41J2/1707

    Abstract: A printing device and method is described comprising: selectively generating a negative fluid pressure between one of one or more printing fluid supplies and a first one of first and second ports of a printhead; selectively generating a positive fluid pressure between one of said printing fluid supplies and a second one of the first and second ports of the printhead; and providing a first pulsed signal to a first priming pump associated with a first one of the first and second ports, wherein the first one of said first and second ports of the printhead is opened under the control of said first priming pump, such that printing fluid within the printhead exits the printhead through the first one of the first and second ports.

    ROTATING HOUSING WITH SENSOR
    19.
    发明申请
    ROTATING HOUSING WITH SENSOR 有权

    公开(公告)号：US20220080739A1

    公开(公告)日：2022-03-17

    申请号：US17419530

    申请日：2019-04-29

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Jordi Hernandez Creus ,  Marta Coma Vives ,  Javier Chavarria Roe ,  Jose Maria Rio Doval

    IPC: B41J2/175

    Abstract: A printing apparatus is disclosed. The printing apparatus comprises a rotating housing comprising a wall with an inner side defining a chamber and an outer side. The wall has a bore communicating the inner side and the outer side, and the chamber is to receive a fluid container. The printing apparatus also comprises a fix frame holding the rotating housing. The printing apparatus further comprises an optical sensor comprising an emitter to issue a detecting optical signal through the bore and a receiver to receive a detected optical signal associated to the detecting optical signal. The detected signal is sent to a controller to determine whether the fluid container is present in the rotating housing.

    Flow channel pressure measurement
    20.
    发明授权
    Flow channel pressure measurement 有权

    公开(公告)号：US11104147B2

    公开(公告)日：2021-08-31

    申请号：US16470940

    申请日：2017-04-19

    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

    Inventor： David Butinya ,  Marta Coma Vives ,  Albert Crespi Serrano ,  Joan-Albert Miravet Jimenez

    IPC: B41J2/175 ,  G01L7/08 ,  G01L9/00 ,  G01L19/00 ,  B41J2/18

    Abstract: A differential pressure sensor is used for measuring or identifying a pressure difference, for example to determine a movement or speed of fluid in a fluid conduit or printer re-circulation conduit. The differential pressure sensor determines the difference between an air pressure and a fluid pressure, wherein the fluid is moving in a flow channel. The flow channel includes a surface conveying a fluid between a first port and second port. An opening in the surface of the flow channel provides a fluid communication between the differential pressure sensor and fluid. Moreover, the sensor is arranged in air communication with the pressure box, such as to allow the differential pressure sensor to identify the pressure difference between the air pressure in the pressure box and the fluid pressure in the flow channel.

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