Disclosed is a substrate processing apparatus. The substrate processing apparatus includes a head unit including a head having at least one nozzle for ejecting a treatment liquid to a substrate and a cleaning unit that cleans the head, wherein the cleaning unit includes a first cleaning member that sprays a cleaning liquid to the head; and a second cleaning member that forms a suction space in combination with the head when being in close contact with the head, and removes impurities attached to the head by providing a reduced pressure to the suction space.

A liquid ejection device includes a head having a nozzle, an element causing the nozzle to eject liquid, a reservoir configured to store the liquid to be supplied to the nozzle, and a controller. The controller is configured to change a drive signal to drive the element based on a quantity of the liquid stored in the reservoir.

A printer includes an ink head including a nozzle, a damper connected with the ink head, a pressure sensor to detect a damper pressure in the damper, a cap attachable to the ink head so as to cover the nozzle, an upward/downward moving mechanism to move the cap upward and downward with respect to the ink head, a suction pump connected with the cap, and a controller. The controller is configured or programmed to include a suction controller to execute a suction process to drive the suction pump in a state where the cap is attached to the ink head, a pressure acquisition controller to acquire the damper pressure from the pressure sensor during the suction process, and an upward/downward movement controller to control the cap to move upward toward the ink head when a change amount of the damper pressure is no larger than a reference change amount.

A printing apparatus includes: a recording head, discharging ink to a recording medium; a roller, having an outer circumferential surface provided for ink idly discharged from the recording head to be attached; a motor, rotating the roller in a predetermined direction; and a scraper, provided to scrape off the ink attached to the outer circumferential surface of the roller in a state in which the roller rotates in the predetermined direction. The scraper has: a recessed surface making surface contact with the outer circumferential surface of the roller; and a notch part formed at an end of the recessed surface, making line contact with the outer circumferential surface of the roller, and recessed in a substantially shape along a rotation direction of the roller and from the end of the recessed surface toward another end.

A liquid ejection apparatus includes a liquid ejection head and a controller. The controller configured to perform: determining whether a discharge failure occurs in a first nozzle; in a case where it is determined that the discharge failure occurs in the first nozzle, determining whether a certain condition is satisfied; in a case where it is determined that the certain condition is satisfied: applying a flushing signal to a second driving element; applying a driving signal to the second driving element; determining whether the discharge failure occurs in a second nozzle; in a case where it is determined that the discharge failure does not occur in the second nozzle, executing a first purge; and in a case where it is determined that the discharge failure occurs in the second nozzle, executing a second purge.

A printer includes a head, a flushing receiving member, a cap, a processor, and a memory. The head is provided with a nozzle surface intersecting a discharge direction and configured to move in a main scanning direction. The flushing receiving member is positioned in the discharge direction with respect to a movement path of the head in the main scanning direction. The cap is configured to closely adhere to the nozzle surface. The cap and the flushing receiving member are arranged in the main scanning direction. The memory stores computer-readable instructions that, when executed by the processor, instruct the processor to perform a process including flushing processing including a first flushing operation of discharging ink from the head toward the cap, and a second flushing operation of discharging the ink toward the flushing receiving member while moving the head in the main scanning direction.

A liquid absorber of the present disclosure includes: a first base material; a second base material; and an absorption layer provided between the first base material and the second base material, in which the first base material and the second base material both contain a flame-retardant filament nonwoven fabric, and a content of a flame retardant in the absorption layer is less than 10% by mass.

An ink jet head maintenance apparatus includes a suction member which includes a suction hole to suction ink and in which air in the suction hole is suctioned from one opening of the suction hole by a suction operation unit. The suction member includes a height adjustment surface which is adjacent to an opening surface in which the other opening of the suction hole is provided and in which an inner angle formed with the opening surface is an obtuse angle. Each position of the opening surface is able to move in a first direction including a normal direction of the opening surface in a predetermined initial state in response to external force applied to the height adjustment surface.

A liquid discharging apparatus includes a liquid discharging head having nozzles, a tank which stores liquid, and a controller. The controller causes the liquid discharging head to perform a discharging operation for discharging the liquid from the nozzles based on a discharging data. The discharging data includes unit discharging data indicating whether the liquid is to be discharged from the nozzles within a predetermined time period. In the discharging operation, a) if a discharge amount based on the unit discharging data is less than a threshold value, the liquid discharging head performs a first discharging operation during the predetermined time period, and b) if the discharge amount based on the unit discharging data is equal to or more than the threshold value, the liquid discharging head performs a second discharging operation during another time period longer than the predetermined time period.

A discharge apparatus includes a discharge unit configured to discharge a liquid to a medium, a suction unit, and a supply unit configured to supply a gas to the suction unit. The suction unit includes an opening facing the medium, and a suction groove including an arc-shaped inner wall surface inside the opening and configured to suck mist around the medium. An outlet portion configured to blow out the gas supplied from the supply unit toward the inner wall surface is provided in the opening.