Hewlett-packard Development Company, L.p.

Hewlett-packard Company

Hp Scitex Ltd.

Xavier Gros

David Claramunt

Jesus Garcia

Francisco Javier Perez

Paul David Gast

Jose Julio Doval

Albert Serra

Gloria Hernandez Ballester

Ronald Albert Askeland

Antonio Gracia Verdugo

Mark S Hickman

Stefano Schiaffino

Robert Warren Beauchamp

Clayton L Holstun

Fernando Juan

Marta Coma Vives

Xavier Alonso

Alberto Borrego Lebrato

Miquel Boleda

Joan Albert Jorba Closa

Antoni Gil Miquel

Emilio Angulo

Ezequiel Jordi Rufes Bernad

Gonzalo Gaston Llado

Ezequiel Jordi Rufes

Jorge Menendez

James L McCullough

Raimon Castells

David H Donovan

Scott A Norum

Jordi Lluch

Alon Levin

Jose Miguel Toran

Josep Miquel Canal

Albert Perez

Abel Marron

In an example of the disclosure, a printhead is caused to spit a liquid into a main cavity of a container. The container includes an overflow pocket for collecting liquid that has overflown from the main cavity. A sensor is caused to detect whether liquid is present in the overflow pocket. Responsive to sensor detection that liquid is present in the overflow pocket, a warning or instruction message is caused to be sent for user consumption.

Collection of liquid ejected from a printhead

In some examples, a service cartridge includes a fluid storage container for receiving fluid discharged from a fluid ejection device, and a web wipe for performing a wiping operation on the fluid ejection device. In a first wiping operation, the web wipe is caused to be advanced by a first length. An amount of discharged fluid into the fluid storage container is monitored. In a second wiping operation after the first wiping operation, in response to the monitored amount of discharged fluid into the fluid storage container, the web wipe is caused to be advanced by a second length different from the first length.

Managing a service cartridge

In one example, a wiper for wiping the face of a movable printhead includes a stationary blade oriented perpendicular to the direction of travel of the printhead and spanning the path of the printhead.

Printhead wiping

An example method for managing a service cartridge for an inkjet printhead in accordance with the present disclosure is provided. The service cartridge comprises a printing fluid storage container for receiving printing fluid discharged from the printhead and a web wipe intended to be advanced a predetermined length for performing a wiping operation on the printhead. The method comprises monitoring the amount of discharged printing fluid into the container, monitoring the amount of consumed web wipe, and causing that in a subsequent wiping operation the web wipe is advanced a length that is higher than the predetermined length, if the ratio of the amount of discharged printing fluid to the capacity of the printing fluid storage container is higher than the ratio of the amount of consumed web wipe to the total length of the web wipe.

Managing a service cartridge for an inkjet printhead

A wet ink printer uses a heated printhead. A platen guides and supports the print medium during printing, and has a plurality of raised ribs. In an example, the ribs extend on the base generally along the advance direction of the print media. Each rib comprises a discontinuous series of rib portions, and wherein between each adjacent pair of ribs is provided a spacing to allow deformation of the print medium towards the platen base.

Printer with print head platen

A media advancing device for a hardcopy apparatus comprising: a platen having at least one slot and a top surface, whereby a medium advances on the top surface; and a plurality of openings connecting the top surface to at least one zone of negative pressure; and a revolving overdrive roller having an outer surface, the outer surface emerging above the top surface through the slot, the overdrive roller being substantially sealed in a housing below the top surface, the housing separating the overdrive roller from the zone of negative pressure.

Media advancing device and method of displacing a medium

A media advancing device for a hardcopy apparatus includes at least one roller having an outer surface and being rotatable for advancing media, and a negative pressure mechanism. The outer surface further comprises a plurality of openings and a contact region for engaging the media, wherein the negative pressure mechanism is capable of creating negative pressure through at least a portion of the openings in the contact region.

Active vacuum roller and method for advancing media

A printing device includes a print media advancement subsystem for providing accurate and timely print media advancement in the printing device. The print media advancement subsystem includes a vacuum chamber for generating a vacuum force through a platen for holding a print media stationary. In response to receiving a print media advance signal from a controller in the printing device, a sealing plate forming a side of the vacuum chamber is removed from the vacuum chamber. When the sealing plate is removed, the vacuum chamber is substantially open to the atmosphere, causing the vacuum chamber to pressurize. The pressurization of the vacuum chamber results in removal of the vacuum force from the print media, allowing the print media to advance along the top surface of the platen with minimal friction.

Pulsating vacuum mechanism for print media-advancement in a printing device

A vacuum holddown device for a hardcopy apparatus, comprising a printing platen with a pattern of through holes and an underlying vacuum chamber, further comprises a member located therebetween and having a substantially similar pattern of through holes, the member being moveable to align the pattern of holes or not so as to respectively interconnect or disconnect the holes in the printing platen and the vacuum chamber. The member may itself define a secondary chamber with which the holes in the printing platen are in communication when not in communication with the vacuum chamber.

Vacuum holddown device for hardcopy apparatus

A media outputting device for a hardcopy apparatus includes a media source and at least one roller having an outer surface with a contact region for engaging media, where the roller is rotatable for outputting the media. The media outputting device also includes a negative pressure mechanism for creating a negative pressure distribution on the contact region where at least one portion of the contact region that is farther from the media source has a greater negative pressure than at least one portion of the contact region that is closer to the media source.

Media outputting device and method for outputting media

A misalignment compensation technique for a dot printer is disclosed. This technique first supplies printing instructions to a printhead for energizing printing elements in various groups (primitives) to print a pattern on a medium. The printed pattern is then detected by optical sensors in the printer. Based on the detection, a position offset error for each primitive is determined. These errors are used to generate a separate time correction for each of the primitives such that, when the printer is used normally, the time period for printing a dot will be advanced or delayed for each primitive so as to align the dots printed by the primitives. In another embodiment, alignment data taken by a manufacturing line sensor is stored in a memory on the print cartridge. After the print cartridge is installed in the printer, a second optical test completes the data needed to create timing correction values.

Alignment of ink dots in an inkjet printer

A hardcopy apparatus includes a media holddown unit, having a platen, and a vacuum source for generating negative pressure on a medium positioned on said platen to keep it flat on said platen. The unit includes at least two vacuum chambers, both in air communication with the vacuum source. Each of the vacuum chambers can apply a negative pressure to a different portion of the medium positioned on a corresponding different region of the platen. A method for holding down a medium when placed on said platen. First the vacuum source is placed into independent air communication with a number of distinct regions of the platen, then the medium is positioned to cover one or more regions of the platen, and finally a negative pressure is applied to the back of the medium via the independent air communication.

Hardcopy apparatus and method for providing uniform pressure to hold down media

Techniques to compensate for random and systematic errors when measuring dot placement errors. Error accumulation due to scan axis irregularities during printhead calibration is minimized by swapping alignment block positions on the print medium from swath to swath. Print media advances during the calibration are minimized by the use of a moving reference instead of a constant reference; adjacent groups of nozzles are used to calibrate the following group. Only a small media advance is needed to print alignment blocks using adjacent nozzle groups one beside the other to be calibrated. To prevent paper slip accumulative errors when using moving references, the order of the groups of nozzles is swapped from one paper advance to the other. This randomizes for small, unavoidable slips when advancing the paper and prevents error accumulation. No further paper advances are used at all for the rest of the dot placement calibration (odd to even columns in a print-head, pen to pen correction and bidirectional correction). When calibrating X-axis position for a group of nozzles, a group of nozzles located at the same Y-axis coordinate is used, so that no paper advances are needed to print them one beside the other.

Techniques for robust dot placement error measurement and correction

A carriage-mounted optical sensor for an ink-jet hard copy apparatus includes a unitary light tube member which holds the optical components in fixed positions relative to each other as well as relative to an outer protective casing which attaches to the carriage. The light tube member serves as a cap to capture two LEDs between itself and a protective casing, to capture an optical lens between itself and a photocell holder, and to directly engage the casing. An inner wall having light redirecting features provides an improved light path cylinder and the device obtains a more accurate representation of the test pattern mark shape, reflectance value, and position.

Stray light compensating unitary light tube for mounting optical sensor components on an ink-jet printer carriage

In various methods, image registration variations among test patterns are used to calibrate misalignment among one or more printheads, paper advance distance, different portions of an inkjet printhead, or bidirectional printhead alignment. A set of test patterns are printed. Each pattern includes a reference portion and a varying portion. The varying portion is changed from pattern to pattern in a manner for testing a parameter being calibrated. An optical sensor scans each test pattern. The parameter setting for the lest pattern having the highest reflectance (i.e., most blank space) is selected as the calibrated parameter value.

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Barcelona, Spain

Xavier Gros