公开(公告)号：US20210291518A1

公开(公告)日：2021-09-23

申请号：US17261052

申请日：2018-12-03

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

Inventor： Li Qian ,  Jamie Juan Munoz ,  David Munoz Navarro

IPC: B41J2/045

Abstract: A printing apparatus is disclosed. The printing apparatus comprises a printhead and a controller. The printhead is to spit a printing fluid comprising a first mode and a second mode. The first mode corresponds to using a first energy level to spit the printing fluid and the second mode corresponds to using a second energy level to spit the printing fluid. The second energy level comprises a higher energy level than the first energy level. The controller is to determine a decap risk zone associated with the printing fluid, determine in view of the decap risk zone a decap location, and instruct the printhead to spit using the second mode at the decap location.

公开(公告)号：US20220281244A1

公开(公告)日：2022-09-08

申请号：US17634753

申请日：2019-09-26

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

Inventor： Albert Estella Aguerri ,  David Munoz Navarro ,  Francisco Guerrero Carvajal

IPC: B41J11/42

Abstract: A system is disclosed. The system comprises a roller with a spindle to wind and/or unwind a roll of media, a media advancement sensor to measure the advancement of the media, and a controller. The controller is to control the spindle to rotate an angular displacement, and to determine a calculated media advancement based on the angular displacement and a radius of the roll of media. The controller is also to receive from the media advancement sensor a measured media advancement. The controller is further to detect that a displacement difference between the measured media advancement and the determined media advancement exceeds a predetermined threshold. If the displacement difference exceeds the predetermined threshold a slippage condition is detected.

公开(公告)号：US10792942B2

公开(公告)日：2020-10-06

申请号：US16340640

申请日：2017-01-19

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

Inventor： Raimon Castells de Monet ,  David Faundez Barroso ,  David Munoz Navarro ,  Marco Ignacio Barbetta

IPC: B41J25/308 ,  G01B5/06 ,  B41J11/00

Abstract: Measuring the thickness of a print media supported by a platen or belt by: moving a measurement bar to a first position to contact a surface of the platen or belt, moving the measurement bar to a second position to contact a surface of the print media when supported by the platen or belt, and determining the spatial difference between the first and second positions such as to measure the thickness of the print media. The measurement bar is arranged to cover a width of the print media when supported by the platen or belt.

公开(公告)号：US20230145554A1

公开(公告)日：2023-05-11

申请号：US17754504

申请日：2019-10-21

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

Inventor： Li Qian ,  Alberto Borrego Lebrato ,  David Munoz Navarro

IPC: G01N15/08 ,  G06T7/00

CPC classification number: G01N15/088 ,  G06T7/001

Abstract: Example implementations relate to substrate porosity determination. Some examples refer to a substrate porosity determination comprising an image capture device a controller to obtain a reference image by the image capture device; obtain a measurement image after a printing operation has been performed on a substrate located over the image capture device; compare the reference image and the measurement image—determine whether the substrate is porous based on the comparison; and determine a print parameter based on the determination of whether the substrate is porous.

公开(公告)号：US11446926B2

公开(公告)日：2022-09-20

申请号：US17261052

申请日：2018-12-03

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

Inventor： Li Qian ,  Jamie Juan Munoz ,  David Munoz Navarro

IPC: B41J2/045

Abstract: A printing apparatus is disclosed. The printing apparatus comprises a printhead and a controller. The printhead is to spit a printing fluid comprising a first mode and a second mode. The first mode corresponds to using a first energy level to spit the printing fluid and the second mode corresponds to using a second energy level to spit the printing fluid. The second energy level comprises a higher energy level than the first energy level. The controller is to determine a decap risk zone associated with the printing fluid, determine in view of the decap risk zone a decap location, and instruct the printhead to spit using the second mode at the decap location.

公开(公告)号：US11413892B2

公开(公告)日：2022-08-16

申请号：US17051821

申请日：2018-08-28

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

Inventor： Raimon Castells De Monet ,  David Munoz Navarro ,  Josep Tarradas i Juan

IPC: B41J29/393 ,  H02P23/14

Abstract: Obstacle detection for a moving element activated by a motor is disclosed. The obstacle detection may comprise a controller to: move the element at a substantially constant speed; determine an actual torque value to move the element at the constant speed; determine a torque parameter based on the actual torque value; comparing the torque parameter with a threshold value; and determining the presence of an obstacle if the torque parameter is above the torque parameter threshold; wherein the torque parameter is determined based on a set of historical torque values and the actual torque value.