Hewlett-packard Development Company, L.P.

University of Washington

Weiyun Sun

Yongmin Kim

Donglok Kim

Stefan G Berg

Robert M Yraceburu

Hsue-Yang Liu

Dawn M Beachnau Hood

Steve Orrin Rasmussen

Matthew Allen Shepherd

Mark H MacKenzie

Milan Justel

Michael Brookmire

Rachelle Cobb

Jay Stephen Gondek

Jason M Quintana

Ricardo Ernesto Espinoza-Ibarra

Stephen J Nichols

Jeffrey Allen Wagner

Teressa L Roth

Anthony Peter Carcia

Rajeev Grover

Brooke Hoyer

Edward L Feldhousen

James D Plymale

Thieu X Dang

Donnell D Daniels

Christie Dyan Larson

Kyle Mannari

Michael S Grow

Murthy Srikantom

Dimitre Lalov Staykov

Jan Elizabeth Casey

Mark H MacKenize

Rachelle Hea Cobb

Christie D Larson

Mark H Mackenzie

A print job having a number of pages is printed in a continuous mode, on media advanced at a constant speed. The print job can thus be effectively treated as having a single page. The media that are advanced for printing the print job can similarly be effectively treated as being a single medium.

Continuous mode printing

Printers and associated printer maintenance methods and apparatus are disclosed. An example printer includes a nozzle to dispense fluid; a wiper to wipe the nozzle during a maintenance event; and a controller to cause the nozzle to dispense fluid during the maintenance event while the wiping material engages or is immediately adjacent the nozzle to deter a substance from being present within the nozzle.

Printers and associated printer maintenance

In some examples, dithering based color conversion may include ascertaining an input color value. Based on conversion of the input color value to an output color space representation, a set of nodes that are to be analyzed to control operation of a printer may be determined. Based on a position of the input color value from each node of the set of nodes, a corresponding probability associated with each node of the set of nodes may be determined. Further, the operation of the printer may be controlled based on the determined probability associated with each node of the set of nodes.

Dithering based color conversion

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

Example implementations relate to wiping die nozzles of fluid ejection dies. For example, a printing device may be directed by execution of stored instructions to eject a droplet in a first direction from an opening in a die nozzle toward a location of an absorbent wipe material and to wipe the opening concurrently with the droplet being ejected from the opening.

Wiping nozzles of fluid ejection dies

A method for notification of an error in data exchanged for an application between a client computer telnet and a server computer telnet is disclosed. The error is detected. A message corresponding to the error is generated such that the error message is separate from the data. The error message is handled such that it has priority over the data.

Method for notification of an error in data exchanged between a client and a server

A method of registering an image onto a sheet of media on an imaging surface of a printer having a printhead for imaging onto the sheet, comprising: detecting a position of said sheet of media being advanced onto the imaging surface using a first sensor positioned along said media path upstream of the printhead; and firing the printhead at a time based on the detected position and a calibrated distance between the sensor and the printhead.

Method and apparatus for image registration

A multi-carriage printing device has a first member, a first bar mounted on the first member, and a first printer carriage mounted on the first bar. The device further has a second bar mounted on the first member, a second printer carriage mounted on the second bar, and a first temperature sensor positioned to sense a first temperature of the member.

Multi-carriage printing device and method

Exemplary embodiments of the invention include systems and methods of reducing visible print defects in drum printers having multi-die printheads oriented substantially perpendicular to the print media path. The exemplary embodiments include printing very small amounts of additional ink via empirically determined printing masks in addition to the normal image content, such that the print defects become less visible. Further exemplary embodiments include printing the additional ink during times typically utilized for print drying.

System and method to hide die-to-die boundary banding defects in a drum printer

A VLIW instruction format is introduced having a set of control bits which identify subinstruction sharing conditions. At compilation the VLIW instruction is analyzed to identify subinstruction sharing opportunities. Such opportunities are encoded in the control bits of the instruction. Before the instruction is moved into the instruction cache, the instruction is compressed into the new format to delete select redundant occurrences of a subinstruction. Specifically, where a subinstruction is to be shared by corresponding functional processing units of respective clusters, the subinstruction need only appear in the instruction once. The redundant appearance is deleted. The control bits are decoded at instruction parsing time to route a shared subinstruction to the associated functional processing units.

Method and apparatus for compressing VLIW instruction and sharing subinstructions

A method and method of mastering a serial bus. A serial bus is monitored in order to detect a quiescent period on the bus. Responsive to a detection of a quiescent period, bus signals to a first master device of the serial bus are interrupted, isolating the first bus master from the rest of the bus. Once the first bus master is isolated, a second bus master may operate on the bus, free from potential deleterious interference from the first bus master. When the second bus master is finished operating, it may cause the re-coupling of the bus, restoring the capability of the first bus master to operate.

System and method of mastering a serial bus

The template data transfer coprocessor (TDTP) offloads block data transfer operations from a mediaprocessor. A uni-block template, program-guided template, an indirect template and queue-based template are described. The TDTP includes a template interpreter that employs an event-driven control mechanism to set up a template and compute block information and block information for each template. The programming involved in defining block data transfers for video and image processing algorithms is substantially reduced by the use of these templates.

Growing community of inventors

Vancouver, WA, United States of America

Weiyun Sun