Hewlett-packard Development Company, L.p.

Aleix Fort Filgueira

Antonio Gracia Verdugo

Mauricio Seras Franzoso

Albert Crespi Serrano

Carles Flotats Villagrasa

Albert Franco Morera

Sheila Cabello Cabrera

Joan Albert Miravet Jimenez

Simone Micheli

Michel Georges Encrenaz

David Toussaint

Andreu Vinets Alonso

Alejandro Mielgo Barba

Alejandro Mielgo

Norman Guillo

Josep Maria Cuner Utges

Joan Uroz Soria

Andreu Cortes

According to an example, a method for a printing system comprises reading configuration data of a printing environment for the printing system, determining based on the configuration data if a concentration of particles emitted during a printing operation of the printing system will exceed a threshold over a time period, and executing at least one remedial action on the printing operation if the concentration of particles will exceed the threshold.

Determining particle concentration

A printer includes a print head to print a pixel by ejecting drops of a printing fluid from the print head, and a controller. The controller monitors a drop volume of the printing fluid ejected by the print head. When the drop volume is below a threshold, the controller controls the print head in accordance with a first print mode to increase the frequency of ejecting drops of the printing fluid within the pixel print time with a decrease in the drop volume that maintains a print quality parameter. The controller changes to a second print mode to increase the pixel print time that maintains the print quality parameter.

Maintaining a print quality parameter in a printer

The present disclosure relates to vinyl substrate printing. In an example, a vinyl printing apparatus is disclosed wherein the apparatus comprises a media path to convey a vinyl substrate along a feed direction from a substrate supply to a print zone; an inkjet printhead to print on the print substrate at the print zone; and a heater upstream of the print zone to heat the print substrate to evaporate a plasticizer from a surface of the print substrate.

Vinyl substrate printing

Methods to wipe a print head are described. In an example of a method, an amount of treatment fluid is determined based on a temperature of the print head and the print head is wiped with the determined amount of treatment fluid and a wiping medium.

Wiping a print head

Example apparatus is disclosed, including apparatus for print head maintenance, the apparatus comprising a print mead maintenance device to perform a print head maintenance operation on a print head during a printing process, and a controller to cause the print head maintenance device to perform the print head maintenance operation with a parameter based on an amount of print agent applied by the print head.

Print head maintenance

There is provided a method and apparatus for monitoring conditioning of a rendering material in a storage structure, where the storage structure comprises a passive transceiver. The passive transceiver may generate a varying response signal where a strength of the varying signal can be monitored and used to determine a pre-conditioning parameter indicative of a condition of the storage structure.

Resource conditioning

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

Examples of the present disclosure relate to a calibration method for a printing system. The method comprises printing a diagnostic pattern representative of decap time. The diagnostic pattern comprises the firing of nozzles after an exposure to ambient air during a first predetermined time period to produce a first pattern element and the firing of nozzles after an exposure to ambient air during a second predetermined time period to produce a second pattern element. The method includes scanning the resulting diagnostic pattern with a sensor to collect decap data in a digital form, digitally analyzing the decap data, the digital analysis comprising identifying a quantitative difference between the first and second pattern elements, and modifying a servicing process of the printing system if the quantitative difference passes a predetermined threshold.

Data collection

It is disclosed a substrate selection method wherein the printer comprises a feeding mechanism including a feeding roller to receive a substrate roll and a media advance roller to receive a substrate from the substrate roll, the method comprising: actuating the feeding roller or the media advance roller; measuring a feeding mechanism parameter on the feeding roller or the media advance roller; calculating a substrate parameter in view of the feeding mechanism parameter; determining from a table a substrate type of in view of the substrate parameter; and selecting a preset on the printer in view of the substrate type.

Substrate selection methods

Circuits for controlling an impeller in a fluid flow distribution system to achieve a target fluid flow are disclosed. The circuit to output a signal representative of a speed value (N) of the impeller derived from a stored power consumption value (W) and speed value (N) pairs to achieve the target fluid flow. The circuit to receive a power signal representative of an input power consumption value (W) of the impeller at the speed value (N) to input fluid to the fluid flow distribution system and to compare the value (W) represented by a power signal for the speed value (N) with the stored value (W) and impeller speed value (N) pairs to determine a least difference impeller speed value (N) of the stored pair comprising a least difference between the value (W) and the value (W). The circuit to output a speed signal representative of value (N).

Fluid impeller controller

Provided in one example is a printing system that has a printing zone with a platen (), a drive, a suction force generator (), a media advance sensor () to monitor movement of the medium through the printing zone in a medium advance direction, and a controller) to perform suction force calibration prior to printing. The suction force calibration includes controlling the drive to cause movement of the medium from an initial position at least partly through the printing zone while the suction force generator is controlled to generate at least one suction force level, determining a suction force level to be used during printing on the medium based on the output of the media advance sensor during the movement, and moving the medium back to the initial position.

Suction force calibration

In certain examples, a printing device comprises a print head, a dryer, a heat exchanger, a distribution system and a controller. The heat exchanger is coupled to an exhaust of the dryer to produce pre-heated air. The distribution system is coupled to the heat exchanger and a plurality of regions of the printing device. The controller causes the distribution system to distribute the pre-heated air from the heat exchanger among the plurality of regions based on an operating parameter of the printing device.

Controlling the distribution of pre-heated air in a printing device

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

Provided in one example is a printing system. The system includes a printing zone including a platen (). The system includes a drive to move a medium () through the printing zone. The system includes a suction force generator () to generate a suction force to hold down the medium onto the platen while the drive moves the medium through the printing zone. The system includes a sensor () to monitor the movement of the medium through the printing zone in a medium advance direction. The system includes a controller to determine that the suction force generated by the suction source generator is insufficient based on an output of the sensor.

Growing community of inventors

Sant Cugat del Valles, Spain

Aleix Fort Filgueira