An inkjet head management apparatus for managing a humidity of an inkjet head including nozzles for ejecting droplets in an inkjet manner includes a housing having an opening on at least one surface thereof, a closer for opening or closing the opening of the housing, and a dehumidifier disposed in the housing to provide a dehumidifying atmosphere toward the opening when the opening is opened.

The print head 10 includes a nozzle region NA1 in which a distance between a nozzle array 23Y and a nozzle array 23C is a distance D1 and a nozzle region NA2 in which a distance between a nozzle array 23Y and a nozzle array 23C is a distance D2. When a ratio of sizes of a plurality of ink droplets ejected from nozzles of a nozzle region NA1 is defined as a first ratio and a ratio of sizes of a plurality of ink droplets ejected from nozzles of a nozzle region NA2 is defined as a second ratio, a control section 30 executes a first print in which a ratio of ink droplets having a size other than a maximum size in the second ratio is smaller than a ratio of ink droplets having a size other than a maximum size in the first ratio.

An inkjet printer includes a printhead maintenance station that emits a mist of fluid onto the faceplate of a printhead mated to a receptacle within the printhead maintenance station. A controller is configured to operate one or more nozzles within the receptacle at predetermined time intervals to maintain a film of a fluid mist on the printhead mated to the receptacle. Alternatively, the controller is configured to monitor a humidity level within the receptacle and operate one or more nozzles within the receptacle to maintain the humidity level within a predetermined range. When more than one nozzle is provided in the receptacle of either embodiment, the controller is further configured to operate the nozzles independently of one another.

A liquid discharge system includes multiple liquid discharge apparatuses, a detector, an exhaust device, multiple exhaust ducts, multiple shutters, and circuitry. The multiple liquid discharge apparatuses discharge a liquid. The detector detects an operation state of each of the multiple liquid discharge apparatuses. The exhaust device exhausts air from each of the multiple liquid discharge apparatuses. The multiple exhaust ducts respectively connect the multiple liquid discharge apparatuses to the exhaust device. The multiple shutters respectively adjust an air volume of the air exhausted through the multiple exhaust ducts. The circuitry controls each of the multiple shutters to change an opening size of corresponding one of the multiple shutters based on the operation state detected by the detector and controls the exhaust device to change the air volume based on the operation state.

A liquid droplet ejecting apparatus includes an ejection head having first nozzles configured to eject a first liquid to a printing medium and second nozzles configured to eject a second liquid different from the first liquid to the printing medium; a memory; and a controller. The memory stores a first lookup table for converting image data into first printing data for using only the first liquid and a second lookup table for converting the image data into second printing data for using both of the first liquid and the second liquid. The controller is configured to cause the ejection head to eject liquid droplets to the printing medium based on the first lookup table or the second lookup table, depending on dryness of the second nozzles.

A liquid discharge apparatus including a cap unit configured to cover and cap an orifice surface on which an orifice of a discharge unit configured to discharge a liquid is provided; and a circulation unit configured to communicate with the orifice of the discharge unit, and circulate a liquid through a circulation path, wherein the cap unit includes a first cap configured not to receive the liquid, wherein the circulation unit performs an operation of circulating the liquid through the circulation path in a state in which the cap unit covers the orifice surface.

A liquid droplet ejection method is provided including capturing an image of a pattern on a substrate, acquiring first image data corresponding to the pattern, and applying the first image data to a machine learning model to perform machine learning and generate liquid droplet ejection conditions based on an electrostatic method. The liquid droplet ejection method described above may further include generating the machine learning model by performing machine learning on pre-acquired first image data.

A printing apparatus has a moving carriage mounted on a printing head having a liquid ejection nozzle, a first cap at one end of a carriage movement range to cap the nozzle, a second cap at the other end of the range, to cap the nozzle, and a control unit having a first control in which first cap caps the nozzle or a second control in which the second cap caps the nozzle. When the carriage has anomalously stopped during printing, a recovery operation on the printing head after the first control execution is different from a recovery operation on the printing head after the second control is executed. The recovery operation includes preliminary liquid ejection at a timing other than printing, suctioning the liquid inside the first cap when the nozzle is capped by the first cap, and/or dipping the nozzle into the liquid supplied into the first cap.