An ink discharge apparatus includes a discharge head and a controller, the discharge head having a plurality of nozzle rows arranged in a first direction, each of the plurality of nozzle rows including a plurality of nozzles arranged to align in a second direction intersecting the first direction. The controller is configured to receive a print job and carry out a mode determining process to determine whether a print mode is a low gap print mode or a high gap print mode based on the print job, and a number of discharge reducing process to reduce the total number of discharging ink per unit time from the plurality of nozzles as compared with the case of the low gap print mode, if the print mode is determined as the high gap print mode.

A printhead module includes: a monolithic substrate having alternate longitudinal slots and longitudinal ink supply channels defined through a thickness of the substrate and extending parallel with each other along a length of the substrate; and a plurality of rows of print chips mounted on a front face of the substrate, each row of print chips receiving ink only from a respective one of the ink supply channels. Each one of the longitudinal slots is configured to supply power and data only to a respective one of the rows of print chips.

There is provided a liquid ejecting unit that ejects liquid from a plurality of nozzles, in which the planar shape of the ejecting face on which the nozzles are formed is a shape in which a first portion that passes through the center line parallel to the long side of the rectangle of the minimum area including the ejecting face and a second portion that does not pass through the center line are arranged in the direction of the long side.

There is provided a liquid ejecting unit that ejects liquid from a plurality of nozzles, in which the planar shape of the ejecting face on which the nozzles are formed is a shape in which a first portion that passes through the center line parallel to the long side of the rectangle of the minimum area including the ejecting face and a second portion that does not pass through the center line are arranged in the direction of the long side.

Machine and method for multi-pass digital printing of plate glass with minimization of print travel. The machine is configured to recognize the longest dimension of the motif to be printed in the X and Y directions and to execute the multiple print passes by moving the bridge in the X direction or by moving the carriage along the bridge in the Y direction.

Machine and method for multi-pass digital printing of plate glass with minimization of print travel. The machine is configured to recognize the longest dimension of the motif to be printed in the X and Y directions and to execute the multiple print passes by moving the bridge in the X direction or by moving the carriage along the bridge in the Y direction.

A liquid discharging device discharges a liquid onto a recording medium for image formation, and includes head modules each including a nozzle array that discharges a liquid of at least one color, the head modules being connected in a direction of the nozzle array from one of the head modules, the one supported by a guide extending in a main-scanning direction; and processing circuitry functioning as an acquirer that acquires image data based on which the image is formed, and an allocator that allocates, to dots of the image data, a row of liquid droplets discharged from one of the head modules closest to the guide in a sub-scanning direction, such that the liquid droplets discharged from the head module closest to the guide are equal to or higher in ratio than the liquid droplets discharged from each head module other than the head module closest to the guide.

A liquid discharging device discharges a liquid onto a recording medium for image formation, and includes head modules each including a nozzle array that discharges a liquid of at least one color, the head modules being connected in a direction of the nozzle array from one of the head modules, the one supported by a guide extending in a main-scanning direction; and processing circuitry functioning as an acquirer that acquires image data based on which the image is formed, and an allocator that allocates, to dots of the image data, a row of liquid droplets discharged from one of the head modules closest to the guide in a sub-scanning direction, such that the liquid droplets discharged from the head module closest to the guide are equal to or higher in ratio than the liquid droplets discharged from each head module other than the head module closest to the guide.

A droplet discharging head executes multi-path recording in which dot recording in one main scanning line is completed by n main scans when n is an integer of 2 or more. The droplet discharging head includes: a plurality of nozzles configured to discharge a liquid as droplets; a pressure chamber defining substrate defining a pressure chamber communicating with the nozzles; a piezoelectric element including a first electrode, a second electrode, and a piezoelectric layer containing a perovskite-type composite oxide containing K, Na, and Nb as a main component; and a vibration plate forming a part of a wall surface of the pressure chamber and configured to vibrate by driving of the piezoelectric element. The number of paths n in the multi-path recording, a piezoelectric constant d.sub.31 [m/v] of the piezoelectric element, and a ratio x of a Na molar fraction to a total value of a K molar fraction and the Na molar fraction in the piezoelectric layer satisfy a relationship represented by a formula (1).

A liquid ejecting head includes: a first nozzle array and a second nozzle array through which a non-fluorescent-colored liquid is discharged; and one or more fluorescent nozzle arrays through which respective fluorescent-colored liquids are discharged. Further, the fluorescent nozzle arrays are arranged between the first nozzle array and the second nozzle array.