Methods and apparatus are described herein for measurement of droplets dispensed from a printhead of an inkjet printer onto a substrate. An inkjet printer described herein comprises a printhead assembly comprising a printhead and an imaging system, the imaging system comprising a camera and a strobed LED source; and a deposition unit for positioning a substrate to receive droplets dispensed from the printhead and for imaging the droplets using the imaging system and the strobed LED source. Methods described herein comprise dispensing droplets of a liquid from a printhead of a printhead assembly of an inkjet printer onto a substrate; positioning the substrate with respect to an imaging system coupled to the printhead assembly, the imaging system comprising a camera and an LED light source; and imaging the droplets on the substrate by relatively scanning the substrate and the imaging system and strobing the LED light source.

A system for cleaning printheads used for printing on a roll of web product is provided herein. The system includes at least one printhead configured to print ink on the roll of web product to form a roll of printed web product, and a cleaning device comprising a wipe. The system further includes a controller configured to perform a cleaning operation by causing application of a cleaning additive to a portion of the wipe and causing the cleaning device to translate across the printhead to cause the portion of the wipe to be wiped across the printhead to clean the printhead. The wipe is applied with a fluid, such as water, or a non-wetted cleaning product. Multiple passes of the cleaning device can be utilized, such as where the portion of the wipe has different or no cleaning additives. Cleaning assistance, such as vibration or heat, can be utilized.

A method of inkjet printing includes the steps of: feeding print media past a printhead; printing onto the print media via a stream of inkjet droplets ejected from the printhead; and generating a jet flow in the vicinity of the stream of inkjet droplets, wherein the jet flow is digitally controlled.

Examples include a device comprising integrated circuit dies molded into a molded panel. The molded panel has three-dimensional features formed therein, where the three-dimensional features are associated with the integrated circuit dies. To form the three-dimensional features, a feature formation material is deposited, the molded panel is formed, and the feature formation material is removed.

A liquid ejection module includes a pressure chamber, a supply flow channel that supplies a liquid to the pressure chamber, a collection flow channel that collects the liquid from the pressure chamber, a liquid feeding chamber connected to one of the supply flow channel and the collection flow channel, and a connection flow channel connecting the liquid feeding chamber to the other of the supply flow channel and the collection flow channel. The liquid feeding chamber includes a liquid feeding mechanism that circulates the liquid in the supply flow channel, the pressure chamber, the collection flow channel, the liquid feeding chamber, and the connection flow channel. A ratio of a sum of flow channel resistance of the supply flow channel, the pressure chamber, and the collection flow channel relative to flow channel resistance of the connection flow channel is equal to or above 0.5.

To provide a head adjustment device, a head device, and a printing apparatus with which it is possible to perform automatic position adjustment of a head module in a head including one or more head modules. Provided is a head adjustment device (150) which adjusts a position of a head module in a head including one or more head modules, the head adjustment device (150) including an adjustment unit that includes an actuator that is connected to an adjustment member, which is operated in a case where the position of the head module is to be adjusted, and operates the adjustment member, a movement unit (248) that moves the adjustment unit relative to the head, and a movement control unit (244) that sets coordinates to be applied to the movement unit based on a reference position of the head module and moves the adjustment unit based on coordinate values of the adjustment member.

A printing apparatus includes: power supply circuits including at least a first power supply circuit and a second power supply circuit, the power supply circuits having mutually different output voltages; and a head including nozzles, the nozzles forming groups arranged in a first direction, each of the nozzles being associated with any one of the power supply circuits. The groups include a first group and a second group adjacent to each other in the first direction. The first group is formed by nozzles associated with the first power supply circuit and nozzles associated with the second power supply circuit. The second group is formed by nozzles associated with the first power supply circuit and nozzles associated with the second power supply circuit.

The method of manufacturing a liquid ejection head according to the invention includes a bonding step, that is, a step of placing a plurality of element substrates on an adhesive layer formed on a bonding surface and heating the adhesive layer to bond the element substrates to a base material. The bonding step is started from one or two of a plurality of bonding regions located at the center portion of the base material in an arrangement direction of the element substrates and then performed toward the bonding regions located at both end portions of the base material.

A pagewide printhead for printing redundantly in four colors. First and second rows of printhead chips are mounted on a common ink manifold having four ink supply channels for supplying four colors of ink to the first and second rows of printhead chips. Dedicated ink outlets interconnect one ink supply channel of the ink manifold with a pair of redundant nozzle rows in each printhead chip.

A liquid ejection head includes a liquid channel through which a first liquid and a second liquid flow in a predetermined direction, a first inlet port through which the first liquid flows into the liquid channel, a second inlet port through which the second liquid flows into the liquid channel, a pressure generation element which pressurizes the first liquid and an ejection orifice through which the second liquid is ejected by pressure received from the first liquid pressurized by the pressure generation element. A length of flow of the second liquid from the second inlet port to a position at which the second liquid is ejectable from the ejection orifice is shorter than a length of flow of the first liquid from the first inlet port to the position at which the second liquid is ejectable.