A liquid supply unit that includes a liquid ejection apparatus and configured to be mounted onto a holder unit that has a liquid introducing needle that extends in a first direction includes an outer shell, a liquid supply port, and an engagement structure including a first engagement portion, in which the first engagement portion is disposed on a mounting direction side of the outer shell at a position that overlaps with the outer shell when the liquid supply unit is viewed from the demounting direction side.

An engagement part fitted in an outer package of an ink cartridge is provided with: a fit-in rib which is provided at a circumferential edge on a rear side and which serves as a guide upon engagement with an opening of the outer package; an engagement rib provided upright at the circumferential edge of the engagement hole in the same direction as a direction of the fit-in rib; and a bonding region for bonding a communication tag that performs near field radio communication with a printer. A tag-removing hole which is formed in the bonding region and which is to be removed from a bonding surface side of the communication tag with a bar-like member inserted is formed in a formation region as the bonding region located in a first quadrant and a fourth quadrant in an orthogonal coordinate system.

An interface structure connectable to a separate liquid reservoir, to connect that liquid reservoir to a receiving station, comprising a liquid interface to fluidically connect to at least one liquid needle of the receiving station, a liquid channel, to fluidically connect the liquid interface to the reservoir, a support wall supporting an integrated circuit laterally next to the liquid channel, the integrated circuit having contact pad contact surfaces, and a front push area adjacent the liquid, the front push area terminating at a front edge that defines a profile height of the interface structure, between said front edge and an opposite distal edge.

A liquid absorber of the present disclosure includes: a first base material; a second base material; and an absorption layer provided between the first base material and the second base material, in which the first base material and the second base material both contain a flame-retardant filament nonwoven fabric, and a content of a flame retardant in the absorption layer is less than 10% by mass.

The liquid container comprises: a first chamber that is surrounded by a plurality of walls and is configured to contain a liquid; a liquid inlet port for pouring the liquid into the first chamber; an air opening port that is opened to air; a liquid lead-out port that leads the liquid out of the first chamber; an air lead-in port that is formed in, out of the plurality of walls surrounding the first chamber, a first wall different from the wall constituting a top surface; and an air communication path that allows the air opening port and the air lead-in port to communicate with each other. The air lead-in port is separated from a corner portion where the first wall crosses with another wall.

The ink jet head module includes: at least one ink jet head that ejects ink; an ink path that supplies ink to the ink jet head; a joint for connecting the ink path and a fitting portion of a printing apparatus main body; a handle which is operated according to attachment and detachment of the ink jet head module to the printing apparatus main body; and a fitting mechanism that inserts and extracts the fitting portion of the printing apparatus main body into and out from the joint in response to movement of the handle.

A liquid ejecting apparatus includes a liquid ejecting head that ejects a liquid supplied from a liquid supplier which has an engaging portion, a container that has an engaging-portion-receiving portion with which the engaging portion engages, and an attaching portion to which the container is detachably attached. The liquid supplier is detachably attached to the attaching portion with movement of the container in a state where the engaging portion has engaged with the engaging-portion-receiving portion. The engaging portion engages with the engaging-portion-receiving portion to be relatively movable in a direction which crosses a movement path of the container when the container is attached to the attaching portion.

A liquid cartridge includes: a cartridge body accommodating a reservoir; a liquid-supply part; a movable member movably supported by the cartridge body; an urging member provided on the movable member; and a contact member provided at a surface of the reservoir. The movable member includes a detected part movable from a first position, to a second position rearward of the first position, and to a third position rearward of the second position, the detected part at the first position and at the second position being positioned higher relative to the cartridge body. The urging member is resiliently deformable, the urging member in a deformed state being deformed to urge the detected part toward the third position. The contact member can contact the movable member, the contact member in contact with the movable member restricting the detected part at the second position from moving to the third position.

An interface structure connectable to a separate liquid reservoir, to connect that liquid reservoir to a receiving station, comprising a liquid interface to fluidically connect to at least one liquid needle of the receiving station, a liquid channel, to fluidically connect the liquid interface to the reservoir, a support wall supporting an integrated circuit laterally next to the liquid channel, the integrated circuit having contact pad contact surfaces, and a front push area adjacent the liquid, the front push area terminating at a front edge that defines a profile height of the interface structure, between said front edge and an opposite distal edge.

A liquid storage container includes: a liquid storage portion including a storage-portion outer shell for storing liquid inside; and an adapter including an adapter outer shell and an insertion opening that is formed in the adapter outer shell and into which a liquid introduction portion of a container attachment portion is inserted, the storage-portion outer shell has a first-type color in a degree that does not allow light to pass through the storage-portion outer shell, and the adapter outer shell has a second-type color having a color difference with respect to a color of the liquid larger than or equal to a threshold.