An example provides a fluid ejection device including a fluid feed slot, a fluid chamber between a nozzle layer and a passivation layer, and a printhead-integrated sensor to sense a property of a fluid in the fluid chamber. The sensor may include a ground electrode exposed to the fluid chamber through a via in the passivation layer.

An example provides a fluid ejection device including a fluid feed slot, a fluid chamber between a nozzle layer and a passivation layer, and a printhead-integrated sensor to sense a property of a fluid in the fluid chamber. The sensor may include a ground electrode exposed to the fluid chamber through a via in the passivation layer.

A printing head assembly with integrated purge mechanism is disclosed. The printing head assembly comprises: (a) a liquid dispensing head comprising one or more dispensing nozzles enclosed in a nozzle plate, driven by at least first and second pressures, and (b) a shielding mask including an opening in front of the one or more nozzles, wherein the opening being configured such that when printing liquid is dispensed from the head driven by the first pressure, the liquid being dispensed in pulses through the opening in the shielding mask, and (ii) when purge printing liquid is dispensed from the head driven by the second pressure, the liquid being drawn to a capillary gap formed between the shielding mask and the nozzle plate thereby removing the purge printing liquid from the nearby nozzles.

A control unit of a liquid ejecting device can perform, as control for ejecting liquid from a liquid ejecting unit, a first ejection control for performing recording on a medium, a second ejection control being a different control from the first ejection control for performing maintenance of the liquid ejecting unit, and a third ejection control being a different control from the first ejection control and the second ejection control for turning the liquid into mist between the liquid ejecting unit and a support portion, and the control unit further performs, when performing the third ejection control, the third ejection control before feeding the medium between the support portion and the liquid ejecting unit.

A printing system that performs double-sided printing includes a first chemical liquid application device that applies a chemical liquid to a first surface of a substrate, a second chemical liquid application device that applies the chemical liquid to a second surface of the substrate, a temperature adjustment device that adjusts a temperature of the substrate, and a moisture content adjustment device that adjusts a moisture content of the substrate, in which the temperature of the substrate when the chemical liquid is applied to the first surface is adjusted to a range exceeding 5.0 C. and lower than a temperature of the chemical liquid, and a first moisture content of the substrate when the chemical liquid is applied to the first surface is adjusted to a range of =5.0% with respect to a second moisture content of the substrate when the chemical liquid is applied to the second surface.

A liquid ejecting head includes a piezoelectric element in which a first drive electrode, a piezoelectric body, and a second drive electrode are laminated, a humidity detection unit used for detecting a humidity, which includes a first detection electrode, an interposed layer, and a second detection electrode, and a temperature detection unit used for detecting a temperature, which includes a temperature detection resistor. The piezoelectric body is provided between the temperature detection resistor and the humidity detection unit in a direction of lamination in which the first drive electrode, the piezoelectric body, and the second drive electrode are laminated, and at least one of the first detection electrode, the interposed layer, and the second detection electrode is provided at a position to overlap the temperature detection resistor in the direction of lamination.

A printing device includes a head including a nozzle configured to ejects ink, a platen including a support surface configured to support a printing medium to which a pretreatment liquid is applied, the pretreatment liquid containing a volatile component that reacts with the ink, and a humidified air supply port configured to supply humidified air to the support surface of the platen that supports the printing medium, the humidified air supply port being provided around the platen in which the support surface of the platen is disposed at a printing position facing the nozzle.

A maintenance device maintains a head unit including a plurality of inkjet heads. The maintenance device includes a plurality of caps, one air pump, and a plurality of supply parts. The caps are provided for the inkjet heads, and attached to nozzle surfaces of the inkjet heads. The air pump supplies air to a plurality of places. The supply parts are provided for the caps, store a humidifying medium, generate a humidified air by passing air supplied from the air pump, and supply the humidified air to the caps.

A processor times a capped time that is a duration time of a capped state of a nozzle unit when the ink is not being ejected, and an open time that is a duration time of an open state of the nozzle unit when the ink is not being ejected. The processor sets a number of times parameter relating to a number of times that a meniscus of the ink in a plurality of nozzles of the nozzle unit is oscillated according to the capped time and the open time. The processor generates the meniscus oscillation of the ink a number of times corresponding to the number of times parameter from when a request for image formation is received until when the image formation is started.

A processor sets, for each target sheet that becomes a target to be conveyed by a preceding conveying device, a specific number of 1 or more in accordance with an ink ejection performance of a nozzle unit obtained at a time a previous sheet that is one sheet before the target sheet is conveyed by a belt conveying device. The processor causes the nozzle unit to execute opening flushing processing for ejecting ink toward the specific number of subsequent opening portions that pass through a print position subsequent to the previous sheet out of a plurality of opening portions of a conveying belt. The processor causes the preceding conveying device to execute processing of conveying the target sheet to the belt conveying device at a timing subsequent to the specific number of the subsequent opening portions.