One example of a printhead assembly includes a housing including sidewalls, nozzles to eject ink drops, a collapsible container, and a sensor assembly. The collapsible container is within the housing to supply ink to the nozzles. The collapsible container includes flexible sidewalls and a spring assembly between the flexible sidewalls. The sensor assembly is coupled to the housing and includes a sensor to provide a sensor signal indicating the amount of ink within the collapsible container.

An efficiency of a liquid supply to an ejection head such as an inkjet head is improved. An ink supply apparatus is provided that supplies ink to an inkjet head of a printer which is an example of inkjet recording apparatuses. The ink supply apparatus includes a non-replaceable ink pack disposed at a position at which the ink stored inside is suppliable by a hydraulic head differential to the printer, and a replaceable pack holder that replaceably holds a replaceable ink pack provided apart from the non-replaceable ink pack. The ink to be supplied to the non-replaceable ink pack is containable in the replaceable ink pack at a position preceding the non-replaceable ink pack. The ink that the non-replaceable ink pack receives from the replaceable ink pack is supplied to the printer under a pressure generated by the hydraulic head differential.

A liquid ejecting apparatus includes a liquid ejecting head that ejects liquid, and a supply device that supplies the liquid from a liquid supply source to the liquid ejecting head, the supply device including a first liquid supplying flow path that supplies the liquid, a pump that feeds the liquid, a second liquid supplying flow path having one end connected to an upstream connecting portion and the other end connected to a downstream connecting portion, a pressure control valve disposed in the second liquid supplying flow path, a buffer in which a volume of a storage chamber varies by displacement of a flexible member, and a pressure applying section that applies pressure to the flexible member from an outside of the storage chamber.

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.

A liquid ejecting apparatus includes a liquid ejecting head that ejects liquid, and a supply device that supplies the liquid from a liquid supply source to the liquid ejecting head, the supply device including a first liquid supplying flow path that supplies the liquid, a pump that feeds the liquid, a second liquid supplying flow path having one end connected to an upstream connecting portion and the other end connected to a downstream connecting portion, a pressure control valve disposed in the second liquid supplying flow path, a buffer in which a volume of a storage chamber varies by displacement of a flexible member, and a pressure applying section that applies pressure to the flexible member from an outside of the storage chamber.

One example of a printhead assembly includes a housing including sidewalls, nozzles to eject ink drops, a collapsible container, and a sensor assembly. The collapsible container is within the housing to supply ink to the nozzles. The collapsible container includes flexible sidewalls and a spring assembly between the flexible sidewalls. The sensor assembly is coupled to the housing and includes a sensor to provide a sensor signal indicating the amount of ink within the collapsible container.

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.

One example of a system includes a bulk ink assembly, a printhead assembly, a valve, and a controller. The bulk ink assembly receives a bulk ink supply. The printhead assembly includes nozzles to eject ink drops, a collapsible container to supply ink to the nozzles, and a sensor to provide a sensor signal indicating the amount of ink within the collapsible container. The valve supplies ink to the collapsible container from the bulk ink assembly in response to a control signal. The controller provides the control signal based on the sensor signal to regulate the amount of ink in the collapsible container and to provide an out of ink signal based on the sensor signal indicating the bulk ink supply is effectively empty.

An efficiency of a liquid supply to an ejection head such as an inkjet head is improved. An ink supply apparatus is provided that supplies ink to an inkjet head of a printer which is an example of inkjet recording apparatuses. The ink supply apparatus includes a non-replaceable ink pack disposed at a position at which the ink stored inside is suppliable by a hydraulic head differential to the printer, and a replaceable pack holder that replaceably holds a replaceable ink pack provided apart from the non-replaceable ink pack. The ink to be supplied to the non-replaceable ink pack is containable in the replaceable ink pack at a position preceding the non-replaceable ink pack. The ink that the non-replaceable ink pack receives from the replaceable ink pack is supplied to the printer under a pressure generated by the hydraulic head differential.

A cartridge case includes a case, a spout support portion, a mount portion, a roll-up member, and a lock member. The case includes a first face extending in a first direction. The spout support portion is configured to support a spout provided in a liquid container containing an inkjet liquid. An end portion on a first direction side of an elastic member is mountable in the mount portion. The elastic member generates an energizing force in the first direction. The roll-up member is configured to roll up the liquid container by being moved in the first direction by the energizing force of the elastic member. The lock member is configured to lock movement, in the first direction, of the roll-up member. The lock member is configured to release lock of the roll-up member, based on consumption of the inkjet liquid contained in the liquid container.