Hewlett-packard Development Company, L.p.

Albert Crespi Serrano

David Butinya Teixido

Jorge Castano Aspas

Tuomo Eljas Kaikkonen

Miquel Boleda Busquets

Marta Coma Vives

Oriol Borrell Avila

Joan-Albert Miravet Jimenez

Mikel Zuza Irurueta

Aleix Fort Filgueira

David Butinya

Frederic Barnel

Joan Albert Miravet Jimenez

Emilio Angulo Navarro

David Toussaint

Alfonso Cameno Salinas

Dorkaitz Alain Vazquez Fernandez

Oriol Parera Fiestas

Fernando Bayona Alcolea

Jorge Millan Lafuente

Jose Miquel Cluet Beltran

Alvin Zheng-Hui Yu

A printing fluid delivery system comprising a fluid pump having an inlet and an outlet, a valve connected to the outlet of the fluid pump, and a controller to close the valve while the fluid pump is driven to increase the pressure at the outlet of the fluid pump based on a service condition and to open the valve based on a predefined relief condition to relieve the pressure at the outlet of the fluid pump.

Fluid delivery system with pump servicing features

Certain examples relate to controlling recirculation processes in a printing apparatus. An example printing material cartridge includes a reservoir storing printing material to supply a printing apparatus; memory; and instructions for controlling a recirculation process in the printing apparatus, the instructions stored in the memory, the recirculation process to cause the printing material to move between the reservoir and a second printing material cartridge, the second printing material cartridge separately replaceable from the printing material cartridge in the printing apparatus.

Printer recirculation control

An example printing fluid circulation system includes a first circuit to circulate a printing fluid through a printhead in a first direction and a second circuit to circulate the printing fluid through the printhead in a second direction opposite to the first direction. The first circuit is activated during a first mode to circulate the printing fluid from a first reservoir to a second reservoir. The second circuit is activated during a second mode different from the first mode to circulate the printing fluid from the first reservoir to the second reservoir.

Printing fluid circulation

Certain examples relate to mixing and/or supply cartridges for printing apparatus. One example implementation includes a reservoir to receive printing material from a printing apparatus and to return the received printing material to the printing apparatus. A storage medium stores a reservoir printing material level parameter indicative of the amount of printing material in the reservoir; a recirculation cycle counter indicative of the number of recirculation events experienced by the cartridge; a maximum recirculation cycle parameter indicative of the maximum number of recirculation events that may be experienced by the cartridge.

Supply and mixing cartridges

A printing device and method is described comprising: selectively generating a negative fluid pressure between one of one or more printing fluid supplies and a first one of first and second ports of a printhead; selectively generating a positive fluid pressure between one of said printing fluid supplies and a second one of the first and second ports of the printhead; and providing a first pulsed signal to a first priming pump associated with a first one of the first and second ports, wherein the first one of said first and second ports of the printhead is opened under the control of said first priming pump, such that printing fluid within the printhead exits the printhead through the first one of the first and second ports.

Printing fluid recirculation

An example printing material cartridge includes a reservoir storing printing material to supply a printing apparatus and a storage medium storing process instructions for controlling the recirculation process in the printing apparatus.

An example printing fluid circulation circuit for a printing system comprises a first circuit port to supply printing fluid to, or receive printing fluid from, a first fluid port of a printhead and a second circuit port to supply printing fluid to, or receive printing fluid from, a second fluid port of a printhead. The printing fluid circulation circuit is to operate in a first mode to concurrently supply printing fluid from the first reservoir to the first circuit port and from the second circuit port to a second reservoir, and in a second mode to concurrently supply printing fluid from the first reservoir to the second circuit port and from the first circuit port to the second reservoir.

In an example, a pressure system includes a fluid movement device, a buffer reservoir coupled to the fluid movement device, and a first fluid interface coupled to the buffer reservoir. In that example, the first fluid interface is able to couple to a pressurizable chamber of a print fluid container (that can apply force on a print fluid bag of the print fluid container).

Buffer reservoirs

Operating a fluid delivering system in a printer, wherein the fluid delivering system comprises a fluid supply including a fluid bag which contains a fluid to be delivered to a fluid delivering tube connected to a printhead, and a closed pressurizing volume which surrounds the fluid bag to expel fluid from the fluid bag to the fluid delivering tube when applying pressure from a pressurizing system to the pressurizing volume, wherein pressure in the pressurizing system relative to atmosphere is measured by a first sensor, and wherein a second sensor provides an output signal which indicates a pressure difference between the pressurizing system and the fluid delivering tube, comprising disconnecting the pressurizing volume of the fluid supply from the pressurizing system, providing a connection of the pressurizing volume to atmosphere to transmit atmospheric pressure to the fluid, generating pressure in the pressurizing system, performing measurements of the pressure in the pressurizing system relative to atmosphere by the first sensor, and calibrating the second sensor by the measurements of the first sensor.

Fluid delivering in a printer

A differential pressure sensor is used for measuring or identifying a pressure difference, for example to determine a movement or speed of fluid in a fluid conduit or printer re-circulation conduit. The differential pressure sensor determines the difference between an air pressure and a fluid pressure, wherein the fluid is moving in a flow channel. The flow channel includes a surface conveying a fluid between a first port and second port. An opening in the surface of the flow channel provides a fluid communication between the differential pressure sensor and fluid. Moreover, the sensor is arranged in air communication with the pressure box, such as to allow the differential pressure sensor to identify the pressure difference between the air pressure in the pressure box and the fluid pressure in the flow channel.

Flow channel pressure measurement

In an example, a printer controller is coupled to a fluid pump, a primer pump, and a pressure sensor of a printer, wherein a flow channel provides a fluid communication between the fluid pump and the printhead for enabling fluid recirculation in the printer. The printer controller: activates the fluid pump; activates the primer pump for a first predefined time interval; and identifies or determines a movement of fluid in the flow channel based on the fluid pressure measured by the pressure sensor.

Recirculation of a fluid in a printer

A system includes an image analyzer to analyze an image to be printed by a printer and to obtain an image parameter of the image, and a database to store a plurality of print-mode configurations for the printer. Each print-mode configuration has associated therewith a measure that represents a suitability of the print-mode configuration to print an image having a certain image parameter on a certain print medium. The database receives a query, and the query indicates the image parameter and a print medium. The database selects, responsive to the query and to the measure, a print-mode configuration for the printer, and outputs the selected print-mode configuration. The system modifies the measure associated with the selected print-mode configuration in response to a feedback about the printed image.

Print-mode configuration selection

A printing fluid cartridge () for a pumped printing fluid system containing a pump () is described, the printing fluid cartridge () comprising a housing () defining an interior chamber (); a collapsible bag () within the chamber for holding a supply of printing fluid (); and a fluid connection member () for forming a fluid connection between the collapsible bag () and an upstream side of the pump (). The housing () includes a structure allowing the application of manual pressure to the collapsible bag () to urge printing fluid out of the collapsible bag through the fluid connection member () to the upstream side of the pump () to displace air () in the fluid connection member () and the pump ().

Printing fluid cartridge for a pumped printing fluid system

In examples a printing system comprises a controller and a printing device. The controller is to divide a print job into a sequence of areas, wherein an image property varies between adjacent areas. The controller is to determine a pausing point to be within a runout area at which a remaining amount of a consumable will be at or below a predetermined first amount when executing the print job when the runout area fulfills a condition. The controller is to determine the pausing point to be within a preceding area that fulfills the condition when the runout area does not fulfill the condition. The controller is to control the printing device to pause printing of the print job at the pausing point.

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Sant Cugat del Valles, Spain

Albert Crespi Serrano