A flow channel structure includes a first flow channel chamber to which an ink is supplied, a first sealing body that configures a wall face of the first flow channel chamber, a valve body that controls flow and blocking of the ink in accordance with deformation of the first sealing body, a second flow channel chamber that communicates with the first flow channel chamber, and a second sealing body that configures a wall face of the second flow channel chamber, in which the rigidity of the second sealing body is greater than the rigidity of the first sealing body.

A liquid supply device includes a first conduit, a second conduit, one or more pumps, a heater, a filter, and a bypass conduit. The first conduit is connected to an upstream side of a liquid discharge head. The second conduit is connected to a downstream side of the liquid discharge head. The liquid is supplied through the first conduit to the liquid discharge head and recovered from the liquid discharge head through the second conduit. The heater is provided along the first conduit. The filter is provided in the first conduit on a downstream side of the heater. The bypass conduit is connected between a portion of the first conduit upstream with respect to the filter and a portion of the second conduit.

There is provided a liquid ejecting head which is long in a first direction and short in a second direction, including: a first introduction section; a second introduction section; a first filter chamber group having a first filter chamber and a second filter chamber; a second filter chamber group having a third filter chamber and a fourth filter chamber; a first supply flow path for supplying the liquid from the first introduction section to the first filter chamber group; and a second supply flow path for supplying the liquid from the second introduction section to the second filter chamber group, in which the first introduction section, the second introduction section, the first filter chamber group, and the second filter chamber group are arranged side by side in this order in the first direction.

A liquid ejecting apparatus includes: a liquid ejecting portion; a liquid storage portion; a filter chamber including an upstream chamber and a downstream chamber divided by a filter; a supply path; a discharge path; an opening/closing valve opening/closing the discharge path; and a pump pressurizing the ink in order to make the ink flow from the liquid storage portion to the upstream chamber, wherein a filling operation of filling the upstream chamber with the ink by driving the pump so that the ink does not pass through the filter in a state in which the opening/closing valve is opened, and then closing the opening/closing valve while the ink is flowing from the liquid storage portion toward the supply path, the upstream chamber, and the discharge path by the driving of the pump is performed.

A liquid surface detector includes a tube through which a liquid passes; an electrode pin disposed on an inner wall of the tube; and a ground pin disposed on the inner wall of the tube. In the liquid surface detector, the electrode pin and the ground pin are disposed in different directions as viewed from an axial direction of the tube.

A liquid ejecting apparatus includes: an ejecting portion configured to be able to eject a liquid onto a medium; a supply flow path configured to be able to supply the liquid to the ejecting portion; a liquid storage unit coupled to the supply flow path and configured to be able to store the liquid, the liquid storage unit being a unit in which an air-liquid interface where the liquid and air are in contact is formed; a first filter provided lower than the air-liquid interface and configured to separate the supply flow path and the liquid storage unit; an adjustment mechanism configured to lift a position of the air-liquid interface in the liquid storage unit; and a control unit configured to control the adjustment mechanism.

A liquid supply unit configured to supply a liquid to a liquid inlet of a liquid jet apparatus. The liquid supply unit includes a liquid housing part configured to house a liquid, a liquid outlet configured to draw the liquid from inside the liquid housing part to outside the liquid housing part, and a filter provided upstream of the liquid outlet in a channel of the liquid that is drawn from inside the liquid housing part to outside the liquid housing part via the liquid outlet. The filter includes a first filter and a second filter that are constituted by a plurality of fibers laminated in a flow direction of the liquid. The first filter is provided upstream of the second filter in the channel of the liquid, and the first filter and the second filter differ in coarseness.

A liquid discharging head includes: a nozzle plate having a plurality of nozzles from which liquid is discharged; a channel member including a plurality of individual liquid chambers that lead to the plurality of nozzles, respectively, and including a plurality of circulation channels that lead to the plurality of individual liquid chambers, respectively; and a common liquid chamber member for forming a common liquid chamber that supplies liquid to the plurality of individual liquid chambers and for forming a circulation common liquid chamber that leads to the plurality of circulation channels.

Disclosed is a method to mitigate deterioration of printing fluid in a tank of a printer. The method comprises: draining printing fluid from a tank of a printer, and stopping the draining before the tank is empty, wherein the printing fluid comprises solids suspended in imaging oil, filtering the printing fluid drained from the tank, to separate at least some of the solids from the imaging oil, passing the filtered imaging oil to a reservoir; and then passing imaging oil from the reservoir to the tank. Also disclosed is a printer and a system to perform the method.

The present invention relates to a external-perfusion hollow-fiber membrane module containing a hollow-fiber membrane bundle including a plurality of hollow-fiber membranes; and a casing that houses the hollow-fiber membrane bundle, wherein the hollow-fiber membrane bundle has one end that is fixed to an inside of the casing by a potting portion in an open state, and the external-perfusion hollow-fiber membrane module is configured to perform degassing on a gas contained in a liquid inside the casing, the gas being introduced into an inside from an outer surface of the hollow-fiber membrane.