A liquid discharge apparatus includes a discharge device, a driving device, processing circuitry, and a reading device. The discharge device discharges liquid to a recording medium to form a test pattern. The driving device causes the discharge device to discharge the liquid according to a driving waveform. The processing circuitry inputs a plurality of driving waveforms and acquires first data indicating a standard pattern that corresponds to the driving waveform and is formed with the driving waveform or indicating a parameter of the standard pattern. The reading device reads the test pattern to generate second data. The processing circuitry compares the second data with the first data and selects a driving waveform generating a smallest difference between the second data and the first data, based on a result of comparison of the second data with the first data.

A liquid ejecting apparatus includes a liquid ejecting head that has an ejection surface including a first nozzle row configured to eject a first ink and a second nozzle row configured to eject a second ink. The liquid ejecting head is configured to be held in a first posture in which the ejection surface is inclined with respect to a horizontal plane. A dynamic surface tension of the second ink is higher than a dynamic surface tension of the first ink. In the first posture, the first nozzle row is positioned above the second nozzle row with respect to a gravity direction.

A liquid ejecting apparatus includes a liquid ejecting head that has an ejection surface including a first nozzle row configured to eject a first ink and a second nozzle row configured to eject a second ink. The liquid ejecting head is configured to be held in a first posture in which the ejection surface is inclined with respect to a horizontal plane. A dynamic surface tension of the second ink is higher than a dynamic surface tension of the first ink. In the first posture, the first nozzle row is positioned above the second nozzle row with respect to a gravity direction.

A liquid jetting apparatus jetting a liquid onto a recording medium conveyed in a first direction includes head units arranged in a second direction orthogonal to the first direction. One head unit includes nozzle chips; one nozzle chip has a nozzle arrangement area wherein nozzles are aligned in a third direction crossing the first and second directions. The nozzle chip is arranged to be shifted relative to another nozzle chip in a direction crossing the first and second directions and different from the third direction. The head unit has a first overlapping portion wherein nozzle arrangement areas of first and second nozzle chips included in the nozzle chips partially overlap with each other in the first direction. The liquid jetting apparatus has a second overlapping portion wherein nozzle arrangement areas of third and fourth nozzle chips included in the head units partially overlap with each other in the first direction.

A liquid jetting apparatus jetting a liquid onto a recording medium conveyed in a first direction includes head units arranged in a second direction orthogonal to the first direction. One head unit includes nozzle chips; one nozzle chip has a nozzle arrangement area wherein nozzles are aligned in a third direction crossing the first and second directions. The nozzle chip is arranged to be shifted relative to another nozzle chip in a direction crossing the first and second directions and different from the third direction. The head unit has a first overlapping portion wherein nozzle arrangement areas of first and second nozzle chips included in the nozzle chips partially overlap with each other in the first direction. The liquid jetting apparatus has a second overlapping portion wherein nozzle arrangement areas of third and fourth nozzle chips included in the head units partially overlap with each other in the first direction.

A first frame holds a platen. A second frame holds a head. When the second frame is at a first position, the head faces the platen. When the second frame is at a second position, the second frame is positioned farther away from the first frame than when the second frame is at the first position. At the second position, the head is positioned farther away from the platen than when the second frame is at the first position. A head lifter is held by the second frame. At the first position, the head lifter moves the head with respect to the second frame between a printing position and a separate position. At the printing position, the head ejects liquid toward a medium supported by the platen. At the separate position, the head is farther away from the platen in an intersecting direction than at the printing position.

A head module includes: a head including: a nozzle plate having a nozzle from which a liquid is to be discharged; a channel substrate including an individual channel communicating with the nozzle, the nozzle plate bonded to a first bonding surface of the channel substrate; and a cover covering at least one side of a discharge surface of the nozzle plate of the head. The channel substrate has a size larger than the nozzle plate, the cover has a second bonding surface bonded to the first bonding surface of the channel substrate at an outer region of the nozzle plate with an adhesive, the discharge surface of the nozzle plate is liquid-repellent, and the first bonding surfaces of the channel substrate and the second bonding surface of the cover are lyophilic.

A head module includes: a head including: a nozzle plate having a nozzle from which a liquid is to be discharged; a channel substrate including an individual channel communicating with the nozzle, the nozzle plate bonded to a first bonding surface of the channel substrate; and a cover covering at least one side of a discharge surface of the nozzle plate of the head. The channel substrate has a size larger than the nozzle plate, the cover has a second bonding surface bonded to the first bonding surface of the channel substrate at an outer region of the nozzle plate with an adhesive, the discharge surface of the nozzle plate is liquid-repellent, and the first bonding surfaces of the channel substrate and the second bonding surface of the cover are lyophilic.

A supporting section is disposed to confront an ejection surface and supports a recording medium. A first tank is mounted on a first-tank mount section. A liquid conveying section conveys liquid to a liquid ejecting head. A receiving section receives liquid ejected from the liquid ejecting head. A waste-liquid conveying section conveys liquid to the waste-liquid tank. A first casing holds the liquid ejecting head, the first-tank mount section, and the liquid conveying section. A second casing holds the supporting section, the receiving section, the waste-liquid tank, and the waste-liquid conveying section. The first casing is connected with the second casing such that the first casing is movable relative to the second casing. The first casing takes a first position at which the ejection surface confronts the supporting section and a second position at which the ejection surface is farther away from the supporting section than at the first position.

A machine for inkjet decoration of ceramic manufactured articles, comprising a basic frame; one supporting surface having a surface to be decorated, where the supporting surface is movable along a direction; a plurality of printing heads each provided with a plurality of nozzles substantially aligned with each other along a relevant line of action and adapted to dispense ink along a relevant direction of dispensing, each of the heads defining a respective range of action on the surface to be decorated, wherein the heads comprise a fixed head(s) and a swivel head(s), and comprises a plurality of groups of heads, where each of the groups comprises a plurality of rows of heads arranged parallel to each other along a direction transverse to the direction, the heads of each of the rows being staggered with respect to the heads of the adjacent row belonging to the same group.