A liquid ejection apparatus and a circulation state determination method capable of helping prevent problems caused by a malfunction. An ejection state detected after a lapse of a first period of time and an ejection state detected after a lapse of a second period of time shorter than the first period of time are compared with each other to detect whether an ink circulation operation is performed faultily.

A recording apparatus includes a holder including a plurality of tanks that contains liquid, a recording head that ejects the liquid supplied from the plurality of tanks, and a control unit that provides a notification about an instruction for agitating the liquid in two or more tanks of the plurality of tanks.

A recording apparatus includes a holder including a plurality of tanks that contains liquid, a recording head that ejects the liquid supplied from the plurality of tanks, and a control unit that provides a notification about an instruction for agitating the liquid in two or more tanks of the plurality of tanks.

An inkjet recording apparatus includes a unit, a unit lifting device, a control part, and a sensor. The unit is provided with a tank for storing liquid. The unit lifting device lifts and lowers the unit. The control part controls the unit lifting device. The sensor detects a rise of a liquid surface in the tank. The sensor is provided at two positions separated in a horizontal direction. The control part determines that the unit tilts when one of the sensors detects the rise of the liquid surface.

An inkjet recording apparatus includes a unit, a unit lifting device, a control part, and a sensor. The unit is provided with a tank for storing liquid. The unit lifting device lifts and lowers the unit. The control part controls the unit lifting device. The sensor detects a rise of a liquid surface in the tank. The sensor is provided at two positions separated in a horizontal direction. The control part determines that the unit tilts when one of the sensors detects the rise of the liquid surface.

A liquid ejection apparatus includes a liquid ejection unit capable of ejecting a liquid, a circulation flow path for supplying the liquid to the liquid ejection unit and recover the liquid from the liquid ejection unit, a pressure change mechanism for changing pressure of the liquid in the circulation flow path, a pressure control valve disposed upstream of the liquid ejection unit in the circulation flow path and configured to adjust pressure of the liquid flowing into the liquid ejection unit, and a negative pressure control valve disposed downstream of the liquid ejection unit in the circulation flow path and for adjusting pressure of the liquid flowing out from the liquid ejection unit, wherein the circulation flow path includes a main flow path in which the pressure control valve and the negative pressure control valve are disposed, and a bypass flow path branched from the main flow path.

A liquid ejection apparatus includes a liquid ejection unit capable of ejecting a liquid, a circulation flow path for supplying the liquid to the liquid ejection unit and recover the liquid from the liquid ejection unit, a pressure change mechanism for changing pressure of the liquid in the circulation flow path, a pressure control valve disposed upstream of the liquid ejection unit in the circulation flow path and configured to adjust pressure of the liquid flowing into the liquid ejection unit, and a negative pressure control valve disposed downstream of the liquid ejection unit in the circulation flow path and for adjusting pressure of the liquid flowing out from the liquid ejection unit, wherein the circulation flow path includes a main flow path in which the pressure control valve and the negative pressure control valve are disposed, and a bypass flow path branched from the main flow path.

An inkjet recording apparatus includes an ink container, one or more recording heads, an ink flow path, a negative pressure regulation valve, a cap, a suction pump, and a waste ink discharge path. The negative pressure regulation valve includes an inflow-side pressure chamber, an outflow-side pressure chamber, a communication hole, a first outflow hole and a second outflow hole respectively formed in the outflow-side pressure chamber so as to be below and above the communication hole, and respectively communicating with the first outflow path and the second outflow path, and a valve member that opens and closes the communication hole. The first outflow path communicates with the recording heads. The second outflow path communicates with an inside of the cap or a waste ink discharge path, and is provided with an opening/closing valve.

A liquid storage apparatus including: a stirring portion including a storage unit configured to store liquid and a drive unit configured to drive the storage unit; and a storage portion configured to store the stirring portion, the storage portion being opened and closed by an opening and closing member, wherein in a case where a stop condition relating to a state of the opening and closing member is satisfied, rotation of the storage unit by the drive unit is stopped.

A liquid stirring apparatus includes a storage unit configured to store a liquid, a support unit configured to rotatably support the storage unit by abutting against an outer peripheral wall of the storage unit, a driving unit configured to rotate the storage unit supported by the support unit. The storage unit comprises a storage member configured to store a liquid container and forms the outer peripheral wall.