A liquid discharging apparatus includes a liquid discharging head that discharges a liquid from a nozzle, a control circuit that controls a discharge operation of the liquid discharging head, a nozzle omission detection mechanism that detects a discharge fault of the nozzle, a maintenance mechanism that performs a maintenance operation, which ejects the liquid from the nozzle of the liquid discharging head, and a display device that displays a setting screen relating to the discharge operation of the liquid discharging head. The control circuit executes the discharge operation of the liquid discharging head on the basis of the operation mode selected by a user using the operation mode selection screen for selecting a plurality of operation modes in which a situation in which a transition to the maintenance operation is performed in a case in which the discharge fault is detected, differs, on the display device.

A method compensates a failing nozzle of a print head of an inkjet printer. The inkjet printer includes at least one print head, the at least one print head including a plurality of nozzles. A receiving material is moved relatively to the at least one print head. The method includes ejecting droplets of marking material from the plurality of nozzles onto the receiving material forming dots of an image, scanning the printed dots, analyzing the scanned dots for detecting whether a nozzle is failing, determining a group of nozzles, which group of nozzles most likely contains the nozzle that is failing, selecting one nozzle of the group of nozzles, in an image part ejecting compensating droplets of marking material in accordance with a compensation scheme selected as if the one nozzle is failing, scanning the image part, repeating the steps of ejecting and scanning for each other nozzle in the group of nozzles, analyzing each image part, selecting from the image parts a deviating image part, the deviating image part having a highest or lowest print quality of all image parts, selecting a compensation scheme based on the deviating image part, and proceeding with printing, including ejecting compensating droplets in accordance with the selected compensation scheme. An inkjet printer is configured to execute the method.

An inkjet recording apparatus includes a plurality of line heads disposed along a conveyance direction of a recording sheet and including a plurality of nozzles to discharge ink droplets, the plurality of nozzles disposed in a direction perpendicular to the conveyance direction of the recording sheet; a plurality of edge sensors corresponding to respective line heads, to detect a lateral edge of the recording sheet; a plurality of actuators corresponding to the respective line heads, to move to the respective line heads laterally in a sheet width direction; a head position adjustor to determine movement amounts of the respective line heads in accordance with outputs of the plurality of edge sensors; and a failure determiner to obtain outputs of the plurality of edge sensors simultaneously and identify a failure of the plurality of edge sensors based on a combination of the outputs from the plurality of edge sensors.

A maintenance method for a liquid discharging apparatus including a discharging portion that discharges liquid, the maintenance method includes acquiring first viscosity information related to viscosity of the liquid inside the discharging portion, discharging a first amount of the liquid from the discharging portion, acquiring second viscosity information related to viscosity of the liquid inside the discharging portion, and discharging a second amount of the liquid based on the first viscosity information and the second viscosity information, from the discharging portion.

The position information includes first position information about a position, at a first timing, of a droplet ejected from a first nozzle, which is one of the plurality of nozzles, and traveling in air, and second position information about a position, at the first timing, of a droplet ejected from a second nozzle, which is one of the plurality of nozzles N and is different from the first nozzle, and traveling in air.

A liquid ejection apparatus includes a first circuit to output a determination signal indicating that ejecting ink is in failure, a second circuit to output a temperature signal indicating a temperature, a recovery device to perform a recovery operation, and a controller. The controller causes a recovery device to perform a first recovery operation based on a first failure-nozzle data in response to determining that a first temperature and a second temperature satisfy a predetermined condition.

An ink discharge operation adjustment method includes the following, recording a halftone image in which the ink is discharged to form a predetermined halftone pattern and a solid image in which the ink completely covers a surface of the recording medium; obtaining a first reading result by a reader reading a non-recording region in which an image is not recorded on a recording medium; obtaining a second reading result of the halftone image and the solid image so that a difference of an elapsed time from a start of the curing to the reading is within a predetermined reference difference; obtaining coverage rate information based on the reading results; and performing setting regarding adjustment of a droplet amount of the ink based on the coverage rate information.

Ink is circulated through a circulation flow path between a print head and an ink tank. Detection operation for detecting an ink ejection state in an ejection opening in the print head is performed. The ink circulation and the detection operation are simultaneously performed by performing the detection operation in response to a start of the ink circulation.

A liquid discharge apparatus includes a drive waveform generator configured to generate a common drive waveform including, in one cycle, a first period having a discharge waveform including a first element for changing a potential from a first potential to a second potential and a second element for changing a potential from the second potential to a third potential, and a second period having a first potential change waveform for decreasing deformation of the piezoelectric device as compared to deformation of the piezoelectric device when the first potential is supplied, and a waveform selector configured to supply the discharge waveform to the piezoelectric device in the first discharge section that discharges the liquid, and supply the first potential change waveform to the piezoelectric device in the second discharge section that does not discharge the liquid.

An ink set includes an inkjet ink and a recording head filling liquid. The inkjet ink contains a pigment, a pigment covering resin, and water. The recording head filling liquid contains polyethylene glycol, a nonionic surfactant, and water. The recording head filling liquid has a viscosity of at least 3 mPa.Math.s and no greater than 10 mPa.Math.s. The polyethylene glycol has a mass average molecular weight of at least 170 and no greater than 300. A percentage content of the polyethylene glycol in the recording head filling liquid is at least 7.0% by mass and no greater than 55.0% by mass. The pigment covering resin includes a styrene-acrylic resin.