An ejection-material ejection apparatus and an imprinting apparatus are provided which are capable of quickly detecting damage of a flexible membrane and avoiding contact between an ejection material and an operating liquid even if part of the flexible membrane is damaged. The flexible membrane includes a first film (1) covering a first storing space (5) for the ejection material, a second film (2) covering a second storing space (6) for the operating liquid, and an inter-film space 4 situated between the first film (1) and the second film (2). A change in state of the inter-film space (4) resulting from communication between at least one of the first storing space (5) and the second storing space (6) and the inter-film space (4) is detected with a liquid sensor (41), a flow speed sensor (77), and a liquid leakage sensor (42).

A liquid discharge apparatus includes a head including a supply path and a discharge path circulating a liquid in a liquid circulation direction, the head configured to discharge the liquid, a circulation path coupled to the head, the liquid circulates through the head in the circulation path, a bypass coupled to a downstream end of the supply path of the head and an upstream end of the discharge path of the head in the liquid circulation direction, a pressure generator configured to generate and apply a circulation pressure to the liquid circulating through the circulation path, and a deaerator configured to remove gas in the liquid circulating the circulation path.

An image forming device including a deaerator that deaerates liquid, a supply tank for storing liquid, a spray device that sprays liquid, and a controller. The controller executes a control causing supply of deaerated liquid from the deaerator to the supply tank, and from the supply tank to the spray device, and spraying of liquid by the spray device to form an image, and while waiting for image forming or while the supply of liquid from the supply tank to the spray device is stopped, the controller executes a control causing at least some of the liquid stored in the supply tank to be supplied to the deaerator in a direction opposite the supply from the deaerator to the supply tank, and causing the deaerator to deaerate the liquid so supplied.

An image forming device including a deaerator that deaerates liquid, a supply tank for storing liquid, a spray device that sprays liquid, and a controller. The controller executes a control causing supply of deaerated liquid from the deaerator to the supply tank, and from the supply tank to the spray device, and spraying of liquid by the spray device to form an image, and while waiting for image forming or while the supply of liquid from the supply tank to the spray device is stopped, the controller executes a control causing at least some of the liquid stored in the supply tank to be supplied to the deaerator in a direction opposite the supply from the deaerator to the supply tank, and causing the deaerator to deaerate the liquid so supplied.

An example apparatus includes a cap to seal a printhead in a printhead assembly, where the cap includes a priming port and a venting port. A vent connected to the venting port is sealed by a cam controlled vent-arm while a vacuum pump connected to the priming port applies a vacuum to prime the printhead. The vent is unsealed by the cam controlled vent-arm and the vacuum pump clears ink from the priming cap.

An example apparatus includes a cap to seal a printhead in a printhead assembly, where the cap includes a priming port and a venting port. A vent connected to the venting port is sealed by a cam controlled vent-arm while a vacuum pump connected to the priming port applies a vacuum to prime the printhead. The vent is unsealed by the cam controlled vent-arm and the vacuum pump clears ink from the priming cap.

A pagewide printhead for printing redundantly in four colors. First and second rows of printhead chips are mounted on a common ink manifold having four ink supply channels for supplying four colors of ink to the first and second rows of printhead chips. Dedicated ink outlets interconnect one ink supply channel of the ink manifold with a pair of redundant nozzle rows in each printhead chip.

A pagewide printhead for printing redundantly in four colors. First and second rows of printhead chips are mounted on a common ink manifold having four ink supply channels for supplying four colors of ink to the first and second rows of printhead chips. Dedicated ink outlets interconnect one ink supply channel of the ink manifold with a pair of redundant nozzle rows in each printhead chip.

A froth coalescing unit for a fluid delivery system for a fluid ejection system, the froth coalescing unit including a coalescing chamber including a sump, an inlet to receive froth into the coalescing chamber, the froth comprising a mixture of fluid and gas, the coalescing chamber to coalesce the fluid from the froth with the coalesced fluid collecting at least in the sump, an outlet to communicate coalesced fluid from the sump, and a fluid level sensor to provide a level over a range of levels of coalesced fluid in the coalescing chamber including in the sump.

A froth coalescing unit for a fluid delivery system for a fluid ejection system, the froth coalescing unit including a coalescing chamber including a sump, an inlet to receive froth into the coalescing chamber, the froth comprising a mixture of fluid and gas, the coalescing chamber to coalesce the fluid from the froth with the coalesced fluid collecting at least in the sump, an outlet to communicate coalesced fluid from the sump, and a fluid level sensor to provide a level over a range of levels of coalesced fluid in the coalescing chamber including in the sump.