An inkjet printer includes a printer body and an ink container provided in the printer body. The ink container includes an ink containing portion, a frame portion and a cover portion. A top portion of the ink containing portion includes a port. The cover portion is pivotally connected to the frame portion and pivotable between an opened position, in which the port is exposed, and a closed position, in which the cover portion covers the port, with respect to the frame portion. The cover portion includes a sealing member provided corresponding to the port on an opposing surface of the cover portion. When the cover portion is in the closed position, the sealing member seals the port, and when the cover portion is in the opened position, the sealing member is separated from the port.

A liquid cartridge includes a housing, a circuit board including an electrode, and a liquid supply portion extending from the housing in a depth direction. The housing includes a top wall, and first and second protrusions protruding upward from the top wall. The first protrusion is positioned rearward but the second protrusion is positioned frontward relative to the circuit board. The first protrusion is higher than an upper edge of a front end of the second protrusion. No part of the liquid cartridge is positioned higher than an imaginary plane in a height direction in a region between a first point on the first protrusion and a second point on the second protrusion (the upper edge of the front end of the second protrusion) in the depth direction. The imaginary plane passes through the first and second points, and extends perpendicularly to the depth direction.

A memory includes: a first type storage area used in a one-time use period from when a liquid is filled into a cartridge to when consumption of the liquid is completed; and a second type storage area used in an entire use period of the cartridge, which is a set of one-time use periods, in which the first type storage area has a plurality of individual areas in which a different area is used in each one-time use period.

A print head can suppress contamination due to ink at the time of being mounted on a printing apparatus and/or after being detached from the printing apparatus. For this purpose, a positioning pin longer than a needle is provided in a joint unit of the print head, and the joint unit includes a shutter which closes an opening on a supply side and an opening on a collection side when the print head is detached.

To provide an aqueous ink having excellent ejection stability and capable of recording an image having excellent abrasion resistance and the like. An aqueous ink for ink jet containing a resin particle, in which the resin particle is formed of a first resin and a second resin, each having a carboxylic acid group, the first resin is a polyester resin not having a crosslinked structure, the second resin is at least one of a polyester resin and an acrylic resin having a crosslinked structure, and the crosslinked structure of the first resin and the second resin is an alkylene oxide group having a repetition number of 1 to 9.

An inkjet recording apparatus includes a carriage configured to scan in a scanning direction, and a discharge head mounted on the carriage and configured to discharge liquid. The discharge head includes a housing and a cover that covers the housing, and a space is provided between an end portion of the cover and an end portion of the housing in the scanning direction. The cover is movable relative to the housing in the scanning direction.

A printing system includes a printer and a cartridge to be attached to the printer in a replaceable manner. The cartridge includes a storage section storing identification information corresponding to an assumed user group assumed to use the cartridge. The printer is configured to perform print setting, and the print setting is performed in accordance with the identification information in the storage section in a state in which the cartridge is attached to the printer.

A system includes: a housing; a first tank; a second tank; a first reservoir configured to be connected to the first tank; a second reservoir configured to be connected to the second tank; and a liquid discharge head that ejects the liquid supplied from the first tank and the second tank. The housing includes: a front wall; a rear wall facing the front wall; and a housing side contact, the first reservoir and the second reservoir includes: a liquid flow hole; a first outer wall; and a second outer wall facing the first outer wall, the first tank includes a first flow pipe, and the second tank includes a second flow pipe. The system further includes a circuit board that is disposed on the second outer wall and has a reservoir side contact that contacts the housing side contact.

An ink tank includes: a first liquid storage chamber; a second liquid storage chamber communicating with the first liquid storage chamber through a communication passage; an injector having an opening supplying liquid to the first liquid storage chamber; a cap movable between an open position and a closed position with respect to the injector; a slide member which is inserted so as to be vertically movable with respect to the opening of the injector, the slide member being moved downward by the cap in the closed position; a valve body which is vertically movably inserted in the communication passage and includes a first sealing member opening the communication passage by moving downward together with the slide member moved downward by the cap in the closed position; and an urging member always urging the valve body upward.

An ink-jet printing apparatus includes an ink-cartridge mounting unit to which an ink cartridge having a first ink chamber containing ink is to be mounted, and a second ink chamber. The second ink chamber stores ink supplied from the first ink chamber. The ink-jet printing apparatus is configured such that, in a case where the ink cartridge is mounted to the ink-cartridge mounting unit, the second ink chamber can be viewed from outside of the ink-jet printing apparatus. An equation 0.5≤L≤d≤1.2 L is satisfied, where d is a length of the second ink chamber, and L is a length of the ink cartridge in a direction in which the ink cartridge is inserted into the ink-jet printing apparatus.