Hewlett-packard Development Company, L.p.

Benjamin H Wood

Joseph Edward Scheffelin

Noah C Lassar

Mohammad Akhavain

Steven Warren Steinfield

Paul Mark Haines

Angela White Bakkom

Antonio Monclus

Lawrence E Gibson

Jon A Crabtree

Lidia Calvo

Anjan Prabhat Pattathil

John M Watanabe

Louis C Ramsay

Franklin D Derryberry

Daniel Laborce

Orestes Alejandro Bihun

A fluid ejection and circulation apparatus may include a fluid ejection die, the pressure regulator, a first standpipe, a second standpipe and a crossflow passage. The pressure regulator has a fluid chamber. The first standpipe is between the fluid chamber and the fluid ejection die. The first standpipe has a first port above the fluid ejection die. The second standpipe extends alongside the first standpipe. The second standpipe has a second port above the fluid ejection die. The crossflow passage connects the first standpipe and the second standpipe.

Standpipe crossflow circulation

Fluid flux correction is disclosed. An example method of fluid flux correction includes displacing a fluid volume in a fluid reservoir with a compliant element. The method also includes absorbing fluid surges caused by variations in fluid flux to reduce distortion of at least one ink nozzle meniscus and maintain consistent fluid ejection.

Fluid flux correction

A fluid ejection head of a fluid ejection device is provided, the fluid ejection head having a substrate, a fluid ejection die coupled with the substrate, an electromagnetic radiation-curable adhesive disposed on the substrate, and a cover coupled with the substrate via the electromagnetic radiation-curable adhesive, wherein the cover includes an opening configured to pass fluids ejected from the fluid ejection die, and wherein the cover is made at least partially of a material transparent to electromagnetic radiation.

Method of making a fluid ejection head for a fluid ejection device

Fluid ejection head assembly

Cleaning apparatus and method of assembly therefor for cleaning an inkjet print head. The cleaning apparatus comprises a web supply for supplying a cleaning web therefrom and a web receiver for receiving the web. A web drive drives the web from the web supply to the web receiver. The web drive pulls the web from the web supply with a first tension force and also pulls the web onto the web receiver with a second tension force greater than the first tension force, so that the web is wrinkle-free while the web slidably engages an exterior surface of the print head to clean the print head. The web remains wrinkle-free to ensure that the surface of the web will contact the surface of the print head without gaps in contact coverage. This enhances cleaning effectiveness compared to a cleaning web having wrinkles.

Cleaning apparatus and method of assembly therefor for cleaning an inkjet print head

Growing community of inventors

San Diego, CA, United States of America

Benjamin H Wood