A print system or a method to apply a negative pressure to a substantially dry volume through at least one vent.

A print system or a method to apply a negative pressure to a substantially dry volume through at least one vent.

A liquid discharge apparatus comprises a head including a discharge port surface, a first reservoir that stores the liquid to be supplied to the head, a flexible member, separating an inner space of the first reservoir into a first chamber that stores the liquid and a second chamber that stores an operation liquid, a second reservoir communicating with the second chamber, the second reservoir storing the operation liquid to be supplied to the second chamber, the second reservoir being disposed in such a manner that a liquid surface of the operation liquid stored in the second reservoir is positioned below the discharge port surface, and an adjustment unit that performs adjustment in such a manner that a position of the liquid surface of the operation liquid in the second reservoir falls within a predetermined range in a state where the second reservoir is opened to atmosphere.

A liquid discharge apparatus comprises a head including a discharge port surface, a first reservoir that stores the liquid to be supplied to the head, a flexible member, separating an inner space of the first reservoir into a first chamber that stores the liquid and a second chamber that stores an operation liquid, a second reservoir communicating with the second chamber, the second reservoir storing the operation liquid to be supplied to the second chamber, the second reservoir being disposed in such a manner that a liquid surface of the operation liquid stored in the second reservoir is positioned below the discharge port surface, and an adjustment unit that performs adjustment in such a manner that a position of the liquid surface of the operation liquid in the second reservoir falls within a predetermined range in a state where the second reservoir is opened to atmosphere.

A discharger is configured to discharge liquid in a liquid channel to outside the liquid channel The liquid is at least one of first liquid and second liquid different from the first liquid. An agitator is configured to agitate the liquid in the liquid channel When executed by a processor, instructions cause the processor to perform: an introducing process of, when the second liquid exists in the liquid channel, controlling the discharger to discharge the second liquid to outside the liquid channel and to introduce the first liquid from the tank into the liquid channel; an agitating process of, after the introducing process, controlling the agitator to agitate the liquid in the liquid channel; and a discharging process of, after the agitating process, controlling the discharger to discharge the liquid in the liquid channel agitated by the agitator to outside the liquid channel

An inkjet printing apparatus is provided with a tank that stores ink, a print head that performs print operation by ejecting ink supplied from the tank, a circulation unit that establishes a circulating state to circulate ink in a circulation path if print operation is performed and establishes a stopped state to stop circulation of ink if print operation is terminated, and a deaeration unit that performs deaeration operation to deaerate ink inside the circulation path. The apparatus includes an estimation unit that estimates a dissolved gas amount in ink inside the circulation path based on dissolved gas amounts increased in the circulating state and in the stopped state, respectively, and a control unit that causes the deaeration unit to execute deaeration operation after completion of print operation if the dissolved gas amount estimated by the estimation unit exceeds a predetermined threshold.

An inkjet printing apparatus is provided with a tank that stores ink, a print head that performs print operation by ejecting ink supplied from the tank, a circulation unit that establishes a circulating state to circulate ink in a circulation path if print operation is performed and establishes a stopped state to stop circulation of ink if print operation is terminated, and a deaeration unit that performs deaeration operation to deaerate ink inside the circulation path. The apparatus includes an estimation unit that estimates a dissolved gas amount in ink inside the circulation path based on dissolved gas amounts increased in the circulating state and in the stopped state, respectively, and a control unit that causes the deaeration unit to execute deaeration operation after completion of print operation if the dissolved gas amount estimated by the estimation unit exceeds a predetermined threshold.

A filter unit includes a filter through which a liquid passes, a filter chamber that is divided into an upstream chamber and a downstream chamber by the filter, an inflow passage through which a liquid flows into the upstream chamber, a first outflow passage through which a liquid flows out from the downstream chamber, and a second outflow passage through which a liquid flows out from the downstream chamber, a distance from the inflow passage to the first outflow passage is shorter than a distance from the inflow passage to the second outflow passage, and a passage resistance of the second outflow passage is lower than a passage resistance of the first outflow passage.

A filter unit includes a filter through which a liquid passes, a filter chamber that is divided into an upstream chamber and a downstream chamber by the filter, an inflow passage through which a liquid flows into the upstream chamber, a first outflow passage through which a liquid flows out from the downstream chamber, and a second outflow passage through which a liquid flows out from the downstream chamber, a distance from the inflow passage to the first outflow passage is shorter than a distance from the inflow passage to the second outflow passage, and a passage resistance of the second outflow passage is lower than a passage resistance of the first outflow passage.

A liquid ejecting device includes a head having a nozzle configured to eject liquid, a container that is connected with the head and is configured to store the liquid, a communication section configured to communicate an internal space of the container with atmosphere, and a liquid reservoir configured to store the liquid and to be removably attached to the container. An internal space of the liquid reservoir is communicated with the internal space of the container through a liquid flow path and a gas flow path in an attached state where the liquid reservoir is attached to the container.