A liquid discharge head includes a discharge unit for discharging liquid, an upstream flow path for supplying liquid to the discharge unit, a downstream flow path for collecting liquid from the discharge unit, and a diaphragm pump for sending liquid in the downstream flow path to the upstream flow path not via the discharge unit. The diaphragm pump includes a pump chamber for functioning as a pump, a suction hole for suctioning the liquid in the downstream flow path into the pump chamber, and a discharge hole for discharging the liquid in the pump chamber to the upstream flow path. The pump chamber is formed with an air bubble discharge hole different from the suction hole and the discharge hole. Air bubbles in the pump chamber are discharged outside through the air bubble discharge hole by reducing a pressure in the air bubble discharge hole.

A liquid discharge head includes a discharge unit for discharging liquid, an upstream flow path for supplying liquid to the discharge unit, a downstream flow path for collecting liquid from the discharge unit, and a diaphragm pump for sending liquid in the downstream flow path to the upstream flow path not via the discharge unit. The diaphragm pump includes a pump chamber for functioning as a pump, a suction hole for suctioning the liquid in the downstream flow path into the pump chamber, and a discharge hole for discharging the liquid in the pump chamber to the upstream flow path. The pump chamber is formed with an air bubble discharge hole different from the suction hole and the discharge hole. Air bubbles in the pump chamber are discharged outside through the air bubble discharge hole by reducing a pressure in the air bubble discharge hole.

A liquid ejection head of the present disclosure includes: a nozzle flow path including a nozzle for ejecting a liquid; and an individual supply flow path for supplying the liquid, the individual supply flow path being orthogonally connected to the nozzle flow path at an end portion of the nozzle flow path in a longitudinal direction, in which the nozzle flow path includes, at the end portion, a wall in a direction in which the individual supply flow path is connected, and the wall has an inclination.

A liquid ejection head of the present disclosure includes: a nozzle flow path including a nozzle for ejecting a liquid; and an individual supply flow path for supplying the liquid, the individual supply flow path being orthogonally connected to the nozzle flow path at an end portion of the nozzle flow path in a longitudinal direction, in which the nozzle flow path includes, at the end portion, a wall in a direction in which the individual supply flow path is connected, and the wall has an inclination.

A liquid ejecting head includes ejection orifice rows each configured as an array comprised of ejection orifices; pressure compartments where pressure acts on liquid to be ejected from the ejection orifices; common supply channels extending in an array direction of the ejection orifice row and configured to supply the liquid to the pressure compartments; common collection channels extending in the array direction of the ejection orifice row and configured to collect the liquid from the pressure compartments; a distributing channel that distributes the liquid to the common supply channels; a merging channel that merges the liquid from the common collection channels; a circulation pump that circulates the liquid in the order of the distributing channel, the common supply channel, the pressure compartment, the common collection channel, and the merging channel; and a bypass opening for connection between the common supply channel and the merging channel, not through the pressure compartment.

A liquid ejecting head includes ejection orifice rows each configured as an array comprised of ejection orifices; pressure compartments where pressure acts on liquid to be ejected from the ejection orifices; common supply channels extending in an array direction of the ejection orifice row and configured to supply the liquid to the pressure compartments; common collection channels extending in the array direction of the ejection orifice row and configured to collect the liquid from the pressure compartments; a distributing channel that distributes the liquid to the common supply channels; a merging channel that merges the liquid from the common collection channels; a circulation pump that circulates the liquid in the order of the distributing channel, the common supply channel, the pressure compartment, the common collection channel, and the merging channel; and a bypass opening for connection between the common supply channel and the merging channel, not through the pressure compartment.

A system includes a storage unit configured to store a liquid container; a discharging unit configured to discharge a liquid to a medium; a stirring unit configured to perform a stirring operation for the liquid container stored in the storage unit such that the liquid stored in the liquid container is stirred; a supplying unit configured to perform a supply operation for supplying the liquid from the liquid container stored in the storage unit to the discharging unit; and a control unit configured to execute first control of prioritizing the supply operation over the stirring operation.

A system includes a storage unit configured to store a liquid container; a discharging unit configured to discharge a liquid to a medium; a stirring unit configured to perform a stirring operation for the liquid container stored in the storage unit such that the liquid stored in the liquid container is stirred; a supplying unit configured to perform a supply operation for supplying the liquid from the liquid container stored in the storage unit to the discharging unit; and a control unit configured to execute first control of prioritizing the supply operation over the stirring operation.