Provided is an aqueous ink for ink jet, containing a resin particle, and a cyclic amide-based, water-soluble organic solvent. The resin particle has a core portion that contains a cyano group-containing unit, and a shell portion that contains an aromatic group-containing unit, an anionic group-containing unit and a unit derived from a crosslinking agent, but free of cyano group-containing unit. Ink jet recording using the aqueous ink can record images that excel in abrasion resistance and gloss clarity.

A liquid cartridge configured to be inserted into a cartridge attachment section includes: a cartridge body having a liquid storage chamber, and a liquid supply portion configured to supply the liquid stored in the liquid storage chamber to an outside. The liquid supply portion includes: a front end face facing frontward, an outer peripheral surface extending rearward from the front end face, and at least one guide provided at the outer peripheral surface. Each of the at least one guide is guided by corresponding at least one projection of the cartridge attachment section during attachment of a liquid supply tube of the cartridge attachment section to the liquid supply portion at a time of attachment of the liquid cartridge to the cartridge attachment section. Each of the at least one guide includes: a first guide portion, and a second guide portion.

An ink-jet ink composition includes: a solvent; a pigment comprising a first powder, the surface of which, in the solvent, bears a first charge; an ionic polymer having a second charge, which is counter to the first charge; and polyvalent ions having the first charge. The ink composition has a surface tension of 53 mN/m or less.

Aspects of a disclosure relates to a liquid discharge device enables previously disabled liquid discharge through a head after a cartridge including a first liquid chamber is replaced and before the liquid level in a second liquid chamber of a tank reaches a predetermined level or higher. Another aspects of the disclosure relates to a liquid discharge device that deactivates an alarm after a cartridge including a first liquid chamber is replaced and before the liquid level in a second liquid reaches a predetermined level or higher.

A unitary, molded fluid reservoir body to which a fluid ejection head substrate is attached. The unitary, molded fluid reservoir body includes one or more discrete fluid chambers therein. Each of the one or more fluid chambers have an open top, side walls, and sloped bottom walls attached to the side walls, wherein each of the one or more fluid chambers terminates in a fluid supply via, and wherein the sloped bottom walls have an angle ranging from about 6 to about 12 degrees relative to a plane orthogonal to the sidewalls. An ejection head support face is disposed opposite the open top for attachment of a single fluid ejection device to the ejection head support face for ejecting fluid provided from the one or more chambers through the one or more fluid supply vias.

An ink supply bottle from which ink is to be supplied to a printer includes: an ink bag that contains the ink; a bottle unit that houses the ink bag and that has a bottleneck with an exit opening; and an ink conduit member disposed in the bottleneck of the bottle. The ink conduit member is in contact with an inner side of the ink bag and seals an opening of the ink bag to form an ink outlet. The ink bag is made of an elastic or stretchable material.

A detection method for a liquid level of a storage tank is provided. The detection method determines that an optical sensor is for a liquid level detection purpose when a sensing value to a tank object is consistent with a first threshold condition. The detection method further determines the optical sensor as valid on liquid level detection when sensing values respectively corresponding to statuses of print material and non-print-material are consistent with a second threshold condition. During printing, the detection method starts/stops pouring print material into a storage tank when the sensing value of the optical sensor is consistent with a third threshold condition correspondingly.

A liquid container connected to a liquid ejection apparatus for ejecting a liquid, includes a container for containing liquid and a filter section for collecting foreign matter, an injection port for injecting the liquid into the container and a lead out port for leading out the liquid from the container are opened in the container, and the filter part is positioned in the injection port.

Disclosed is a liquid storage container comprising a liquid reservoir part holding liquid, an air communication part including an air communication port communicating with the atmosphere, an inner port communicating the liquid reservoir part with the air communication part, a seal member closing the inner port from the inside of the air communication part, a first biasing member biasing the seal member in a first direction from a first position away from the inner port toward a second position of closing the inner port, and a pressure receiving part including a protruding portion protruding from the air communication port to the outside of the air communication part, and joined to the seal member or the first biasing member. The seal member is separated from the inner port when the protruding portion of the pressure receiving part is pushed in a second direction opposite to the first direction.

A printing fluid cartridge includes a front face oriented toward a first direction, a printing fluid supply portion positioned at the front face, a rear face positioned opposite the front face and oriented toward a second direction opposite the first direction, at least one electrical interface positioned between the front face and the rear face, and an engagement surface facing in the second direction. The at least one electrical interface is offset from the printing supply portion with respect to a third direction perpendicular to the first direction and the second direction. The at least one electrical interface is positioned closer to the front face than the engagement surface is, and the at least one electrical interface and the engagement surface intersect a plane which is parallel with the first direction, the second direction, and the third direction.