公开(公告)号：US20190337294A1

公开(公告)日：2019-11-07

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 ,  G01L19/00 ,  G01L9/00 ,  G01L7/08

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.

公开(公告)号：US20180264819A1

公开(公告)日：2018-09-20

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: 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.