A recording apparatus includes a recording head configured to discharge a liquid, a first liquid reservoir unit configured to store the liquid to be supplied to the recording head, a liquid supply port configured to supply the liquid stored in the first liquid reservoir unit into the recording head, a liquid supply path connecting the first liquid reservoir unit and the liquid supply port, a second reservoir unit, in the recording head, configured to store the liquid supplied from the liquid supply port, and a holding unit configured to hold the liquid supplied from the second reservoir unit, in the recording head, wherein the second reservoir unit includes an opening provided upward in a direction of a gravitational force with respect to the liquid supply port and is configured to supply the liquid to the holding unit, when the recording head is in a posture of performing recording.

There is provided liquid discharging head including; channel member which includes plates stacked in a first direction and adhered to each other via adhesive, and in which individual channels each including nozzle and pressure chamber communicated with the nozzle is formed. The plates include first plate and second plate adhered to adhesion surface of the first plate via the adhesive. Hollows each construct one of the individual channels are opened in the adhesion surface. The hollows are arranged side by side in second direction orthogonal to the first direction in the adhesion surface, and three or more grooves are formed in the adhesion surface between two of the hollows adjacent to each other in the second direction, each of the three or more grooves extending in third direction which is orthogonal to the first direction and which crosses the second direction.

There is provided liquid discharging head including individual channels, supply throttles, and return throttles formed in plates. The supply throttles are formed in first plate of the plates and the return throttles are formed in second plate of the plates. Each of the supply throttles has cross section which is rectangle having first and second sides. Each of the return throttles has cross section which is rectangle having first and second sides. The length of the first side of each of the supply throttles and the length of the first side of each of the return throttles are substantially identical. The length of the second side of each of the supply throttles and the length of the second side of each of the return throttles are substantially identical. Aspect ratio of each of the supply throttles and aspect ratio of each of the return throttles are substantially identical.

In some examples, an apparatus can include a valve body including a recirculation inlet path and a recirculation outlet path, a piston assembly located in the valve body, and a recirculation cavity between the valve body and the piston assembly, where print material is to be circulated through the recirculation cavity via the recirculation inlet path and the recirculation outlet path.

A liquid discharge apparatus includes a head including a supply path and a discharge path circulating a liquid in a liquid circulation direction, the head configured to discharge the liquid, a circulation path coupled to the head, the liquid circulates through the head in the circulation path, a bypass coupled to a downstream end of the supply path of the head and an upstream end of the discharge path of the head in the liquid circulation direction, a pressure generator configured to generate and apply a circulation pressure to the liquid circulating through the circulation path, and a deaerator configured to remove gas in the liquid circulating the circulation path.

A liquid discharge head is provided in which heat of a heat sink is less apt to transfer to a head body. The liquid discharge head includes a head body 2a having a discharge hole for discharging a liquid therethrough, a driver IC 93 configured to control driving of the head body 2a, a casing 91 which is disposed on the head body 2a and has openings 91a and 91b on a side surface of the casing, and a heat sink 90 which is disposed on the openings 91a and 91b of the casing 91 and configured to dissipate heat generated in the driver IC 93, and a thermal insulation part 91e disposed between the heat sink 90 and the head body 2a. This makes it possible to reduce the likelihood that the heat of the heat sink 91e transfers to the head body 2a.

Fluid is continuously recirculated through a thermal fluid-ejection printhead. Prior to firing a thermal resistor of the printhead to thermally eject a drop of the fluid through a nozzle of the printhead, the fluid is recirculated on-demand through a chamber of the printhead between the nozzle and the thermal resistor. The thermal resistor is fired to thermally eject the drop of the fluid through the nozzle. The fluid has a concentration of solids greater than 12% by volume.

Since ink is not heated at a protrusion connecting an ink supplying device and a print head chip or the like, the viscosity of the ink increases, and the fluidity may not be maintained in some cases. An inkjet printer 1 for solving the above problem includes an inkjet head 300 that ejects ink; a protrusion 310 provided to protrude from the inkjet head 300 and configured to circulate the ink to the inkjet head 300; and an ink flow path portion 6 that supplies the ink to the protrusion 310; where the ink flow path portion 6 includes an ink warming block 200 that heats the ink, and a conducting portion 210 that is formed in the ink warming block 200 itself or separately from the ink warming block 200 and through which heat from the ink warming block 200 is conducted is adjacently disposed outside the protrusion 310.

The control section sets, as a first flow rate, a flow rate of the liquid, which is circulated by the circulating mechanism, per unit time, during an ejection operation of ejecting the liquid from the liquid ejecting head. The control section sets, as a second flow rate greater than the first flow rate, a flow rate of the liquid, which is circulated by the circulating mechanism, per unit time, during a recovery operation of recovering a state of the liquid ejecting head.

A liquid ejecting head includes: a plurality of individual flow channels provided with nozzles; a common supply flow channel through which a liquid is supplied to the plurality of individual flow channels; a common discharge flow channel through which the liquid is discharged from the plurality of individual flow channels; and a bypass flow channel that bypasses the plurality of individual flow channels and causes the common supply flow channel and the common discharge flow channel to communicate with each other. A combined flow channel resistance of the bypass flow channel and the plurality of individual flow channels is greater than a flow channel resistance of the common supply flow channel and is greater than a flow channel resistance of the common discharge flow channel.