Hewlett-packard Development Company, L.p.

Hewlett-packard Company

Other

Mark H MacKenzie

Joseph M Torgerson

Garrett E Clark

Angela White Bakkom

Michael W Cumbie

Robert N K Browning

Matthew Allen Shepherd

Michael D Miller

Chris Bakker

Bruce Cowger

Patrick V Boyd

David M Hurst

Eric T Martin

Wesley R Schalk

Steve Orrin Rasmussen

Simon Dodd

Roberto A Pugliese

Victorio Chavarria

Thomas E Pettit

Glenn D McCloy

Allen H Smith

Steven P Storm

Robert M Yraceburu

Paul Clinton Coffin

Luke P Sosnowski

Andrew F Phillips

Weiyun Sun

Hsue-Yang Liu

Dawn M Beachnau Hood

Chien-Hua Chen

Adam L Ghozeil

Trudy L Benjamin

Kevin Lo

Naoto A Kawamura

Jason M Quintana

Jeffrey G Bingham

Duane A Koehler

Tony S Cruz-Uribe

Jeremy Harlan Donaldson

David Maxfield

Jeremy Sells

Erick Blane Kinas

Bradley D Chung

Bruce A Axten

Richard Lee Brinkly

Shen Buswell

Volker Smektala

Jose Luis Valero

Gregory N Burton

Douglas Harriman

Brooke Hoyer

Bradley B Branham

Kenneth D Saul

Julie J Cox

Francisco Javier Gomez Maurer

Eugene J Mar

Ernesto A Garay

Milan Justel

David Miller Lowe

Catherine Elizabeth Gould

Conrad Jenssen

Christopher A Leonard

Vincent Gerard Heesen

Paul Templin

Matthew P Heineck

Wesley R Dchalk

Michele D Friesen

The present disclosure includes a description of an example printhead having multiple ejection dies. The ejection dies are coupled to a temperature sensor and send temperature signals to a controller. The printhead can also include a heater coupled to the ejection dies to apply heat to at least one ejection die.

Printheads

In an example, a print system include a component device that is operation in a number of state, a density engine, and a component engine. An example density engine identifies a plane region of a plane where print fluid is to be printed based on data of a print job and determines a density classifier for the plane based on a location of the plane region on the plane. An example component engine causes an adjustment of a component attribute of the component device based on the density classifier.

Density classifiers based on plane regions

According to an example, an apparatus may include a fluid coverage engine to determine which pixels of an image are to receive print fluid. The apparatus may also include a pixel count engine to compute a count of pixels at which print fluid is to be applied onto a media from the determined pixels of the image that are to receive print fluid, a target temperature engine to determine a target temperature for a dryer based upon the computed count of pixels, and a dryer engine to cause the dryer to become heated to the determined target temperature.

Determination of printer dryer target temperatures

In one example, a partially dried inkjet media conditioner can include: a print engine that encases a print zone within a housing, and a media path to provide partially dried inkjet media from the print zone to a conditioner within the print engine, wherein the conditioner comprises a heated pressure roller.

Partially dried inkjet media conditioner

In one example in accordance with the present disclosure a printhead is described. The printhead includes a number of nozzles to deposit an amount of fluid onto a print medium and an ink delivery system to deliver the amount of fluid from an ink tank to the number of nozzles. The printhead also includes an attachment feature to removably couple a removable printhead cover to the printhead. The printhead further includes a removable printhead cover removably coupled to the printhead at the attachment feature.

Printhead with removable printhead cover

In one example implementation, a printing device may comprise a number of media skewing rollers to skew a print medium to a predetermined angle with respect to a media feed path and a print engine to print an image on the skewed print medium, the print engine skewing a digital representation of the image based on the predetermined angle such that the image printed is aligned with the print medium. In another example implementation, a printing device may comprise a number of skewing rollers to skew a print medium to a predetermined angle with respect to a media path, a number of pinch rollers to receive the skewed print medium prior to printing, and a print engine skewed to the same predetermined angle as the skewed print medium.

Skewing print medium

Printheads and methods of fabricating printheads are disclosed. An example printhead includes a substrate and a printhead die disposed on a surface of the substrate, where a top surface of the printhead die projects a first distance from the surface of the substrate. The example printhead also includes a barrier at least partially surrounding the printhead die. A top surface of the barrier projects a second distance from the surface of the substrate, where the first distance is less than the second distance.

Printheads and methods of fabricating a printhead

In one example, a system for partially dried inkjet media fusers include a plurality of fusers aligned to receive partially dried inkjet media from a printing device, wherein the plurality of fusers each comprise a top roller and a bottom roller to apply pressure to the received partially dried inkjet media, and a finisher to receive the partially dried inkjet media from the plurality of fusers.

Partially dried inkjet media fusers

A temperature of one printing element is adjusted based upon a temperature of another of printing element.

Printing element temperature adjustment

The present disclosure includes a description of an example print bar that includes an ejection die disposed on a support element, and a sensor disposed at a particular location on the support element.

Print bar sensors

Examples described herein include a printhead assembly that includes a housing having a printing material reservoir and a print nozzle array disposed in a side of the housing. The print nozzle array is coupled to the printing material reservoir through a first channel. The printhead assembly can also include a pressure equalization element disposed in the side of the housing and coupled to the printing material reservoir through a second channel to allow air to enter the printing material reservoir when a pressure in the printing material reservoir changes.

Printheads with pressure equalization

In one example in accordance with the present disclosure a printer cartridge is described. The printer cartridge includes at least one backpressure chamber to provide backpressure to a fluid during deposition of the fluid onto a print medium. The printer cartridge also includes multiple fluid chambers in fluid communication with the at least one backpressure chamber. A fluid chamber provides fluid to a portion of a printhead. Adjacent fluid chambers are selectively in fluid communication with one another via valves.

Printer cartridge with multiple fluid chambers in fluid communication

A skew sensor calibration unit including a scanner providing a scanned image of a sheet as the sheet is conveyed along a transport path, the scanned image including a leading edge of the sheet and a skew detection pattern printed thereon by a printhead. A calibration module measures a top skew of the sheet based on position signals from a plurality of skew sensors indicating a position of a leading edge of a sheet as the sheet is conveyed along the transport path, measure an image skew of the sheet relative to the printhead based on the scanned image, and generates a calibration factor that when applied to the measured top skew provides a calibrated top skew that matches the image skew.

Skew sensor calibration

Selecting nozzles can include selecting nozzles of a plurality of nozzles to print a portion of a print job based on content of the print job and assigning firing reservations to the selected nozzles, where a total number of the firing reservations assigned to the selected nozzles is comparatively less than a total number of the plurality of nozzles.

Selecting nozzles

Growing community of inventors

Corvallis, OR, United States of America

Mark H MacKenzie