Hewlett-Packard Development Company, L.p.

Francisco Lopez Moral

Chandrasekhar Nadimpalli

Ronald Albert Askeland

Xavier Bruch

Xavier Gasso Puchal

Jeffrey Allen Wagner

Maria Dinares Argemi

Alex Andrea Tallada

Marian Dinares Argemi

Maria Magdalena Martinez Ferrandiz

Brian J Keefe

Lawrence H White

Steven Warren Steinfield

Raimon Castells De Monet

Eduardo Amela Conesa

David Ramirez Muela

Rafael Ulacia Portoles

Thomas Michael Sabo

Gonzalo Gaston Llado

Santiago Sanz Ananos

Marta Blanch Pinol

Maria Elizabeth Zapata

Joan-Albert Miravet Jimenez

Diana Canto Estany

Juan Uroz

Daniel Vincent Keane

Maria Magdalena Martinez

Xavier Bruch Pla

Yit Hong Tor

Jason Jolly

Alyssa Michelle Siegman

Yi Hong Tor

Curtis N Torgerson

Ronald A Askeland

Jeffrey A Wagner

Daniel V Keane

Alyssa M Siegman

It is hereby disclosed a method to print on porous substrate by a printer comprising: a print zone; a conveyor to receive a porous substrate on a loading zone and to move the porous substrate along a transport direction between the print zone and the loading zone; a print engine positioned on the print zone for ejecting printing fluid towards the porous substrate; wherein the method comprises ejecting printing fluid towards a front side the porous substrate and, by a controller, activating a vacuum source as to exert a vacuum on a back side of the porous substrate being the vacuum exerted while the porous substrate is within the print zone.

Vacuum-assisted printing for porous substrates

Method and devices for dynamically preventing printing errors caused by a media deformation are disclosed. In one example, a pen to print media space (PPS) distance is measured. A media deformation is identified in response to measuring the PPS distance. A corrective function is identified in response to identifying the media deformation. The corrective function identified is then performed. The proposed method provides for consistent quality across a print.

Preventing printing errors due to print media deformations

A printing system may comprise a page wide array printhead a capping station, and a number of modular caps comprising a housing to cover a nozzle array of a printhead and a cap coupler coupled to the housing to couple the cap to the nozzle array in which the modular caps are adapted to be coupled to and removed from the nozzle array of the printhead and stored in the capping station.

Printer cap

Methods and apparatus to control a heater associated with a printing nozzle are disclosed. A method comprising controlling a heater associated with a printing nozzle to reduce a heat output of the heater based on a determination that the printing nozzle is outside a print area and printing an image on a substrate using other printing nozzles while the heat output of the heater is reduced.

Methods and apparatus to control a heater associated with a printing nozzle

A printer is disclosed herein. The printer has a printhead having a plurality of ink nozzles for ejecting ink, a servicing mechanism for capturing the ejected ink from the ink nozzles, to service the printhead, and a control device coupled to the printhead and the servicing mechanism for regulating the servicing. As part of the regulation, the control device continues feeding a substrate towards the printhead during an idle period. The idle period of the printhead can be a duration when printing on the substrate is suspended. Further, the control device regulates ejection of ink from the ink nozzles towards the substrate during the idle period and operates the servicing mechanism during the idle period. In an example, the servicing mechanism captures the ink before the ink reaches the substrate.

Servicing a printhead of a printer

A printing fluid delivery system includes a reservoir, a conduit system, and a first heating module. The reservoir may store printing fluid. The conduit system may include a plurality of conduit segments to transport the printing fluid between the reservoir and the printing fluid applicator. The first heating module may selectively heat one conduit segment to increase a temperature of the printing fluid therein to a first temperature which is greater than a second temperature of the printing fluid in an other conduit segment, and to thermally induce recirculation of the printing fluid.

Thermally-induced recirculation of printing fluid

A system for monitoring ink flow is disclosed. In one embodiment, the system includes a printhead configured to perform a priming event, a heating element, a sensor configured to measure the temperature of a printhead die at a plurality of times, and a processor configured to determine the success of a priming event by comparing an actual cooling rate to a threshold cooling rate.

Monitoring ink flow

Various embodiments and methods relating to wiping of a print head are disclosed.

Print head wiping

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Barcelona, Spain

Francisco Lopez Moral