An inkjet printer includes a first light applicator disposed in a second scanning direction relative to a recording head. The first light applicator includes a first upstream light source group at a location corresponding to a location of the recording head in a movement direction of a recording medium, and a first downstream light source group on a downstream side in the movement direction of the recording medium relative to the recording head. The inkjet printer turns off the first upstream light source group and turns on the first downstream light source group during movement of a carriage in a first scanning direction and discharge of first ink from the recording head, and turns on the first upstream light source group and the first downstream light source group during movement of the carriage in the second scanning direction after discharge of the first ink.

On a carriage that is transported in a main scanning direction by a main scanning drive portion heads are disposed so as to be displaced from each other in a sub-scanning direction, and heads are disposed so as to be displaced from each other in the sub-scanning direction. Therefore, even when an ejection failure occurs in nozzles of one of the two heads and in nozzles of one of the two heads ink can be ejected from the other head that ejects the same type of ink in main scanning. Thus, even when the ejection failure occurs in the nozzles, a deterioration in print quality can be suppressed.

DOD ink delivery systems and methods are described herein that are used in DOD card printing systems of card processing systems for supplying ink for DOD printing on plastic cards of the type that bear personalized data unique to the intended cardholder and/or which bear other card information. The DOD ink delivery system is configured to recirculate the ink, or have a second pressure damper container that provides damping to eliminate large and abrupt spikes in ink pressure which can disturb the meniscus of the ink in each nozzle of the print head generated by a vacuum system, or simultaneously operate a supply pump at a lower flow rate than a return pump during an autofill/autodrain procedure on the ink delivery system.

The present disclosure provides a liquid ejection device to which an additional head can be attached and which suppresses a reduction in print quality. The liquid ejection device includes a main scanning drive portion that transports, in a main scanning direction, a carriage on which are mounted a base printing head that ejects ink for base printing onto a print medium, and a color printing head that ejects at least two colors of ink, from yellow, magenta, cyan, and black, onto the print medium, the base printing head and the color printing head being separated from each other in the sub-scanning direction. Between the base printing head and the color printing head on the carriage, the liquid ejection device includes an additional head attachment portion to which the additional head can be added.

A liquid ejection head is provided which comprises a channel member and a housing. The channel member comprises a first surface, which includes one or more ejection ports configured to eject liquid from the first channel member, and a second surface different from the first surface. The housing is disposed on the second surface and comprises one or more electric circuits. The second surface of the channel member comprises a first opening located outside of the housing and is configured to receive the liquid supplied to the one or more ejection ports.

A first switching circuit, a second switching circuit, a first bootstrap circuit that is coupled to the first switching circuit and the second switching circuit, and a smoothing circuit and outputs a drive signal are provided, in which the second switching circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor of which the first voltage is supplied, and which is driven based on the third gate signal, a fourth transistor which is driven based on the fourth gate signal, and a second bootstrap circuit that includes a second capacitive element supplying a third voltage to the second gate driver and coupled to a second output point and the second gate driver, and a second diode of which the first voltage is supplied and which is coupled to the second capacitive element.

An apparatus includes a jet that applies a liquid binder to an application surface and a particle applicator. The particle applicator includes a particle reservoir with at least one movable surface, an electrically controlled actuator that causes vibrations of the movable surface, and a dispersal port though which particles can exit the particle reservoir. A controller is coupled to cause the vibrations via the actuator. The vibrations result in movement of the particles through the dispersal port towards the liquid binder on the application surface.

There is provided a liquid ejection apparatus including: a liquid ejection head that includes nozzles; a signal output circuit that outputs a signal that varies depending on whether at least part of the nozzles includes a discharge-defective nozzle; and a controller. The controller is configured to discharge a liquid on a medium by using a partial discharge mode; perform determination, for at least one nozzle included in the nozzles based on the signal from the signal output circuit, about whether the discharge-defective nozzle is included therein; and set, based on the signal from the signal output circuit, the part of the nozzles not to include the discharge-defective nozzle when the liquid is discharged from the liquid ejection head on the medium by using the partial discharge mode and when the controller has determined that the discharge-defective nozzle is included in the nozzles.

An actuator drive circuit of a liquid discharge apparatus includes a discharge waveform generating circuit, a sleep waveform generating circuit, and a wake waveform generating circuit. The discharge waveform generating circuit is configured to generate a plurality of drive waveforms to be applied to actuators of the liquid discharge apparatus for liquid discharge. The drive waveforms correspond to gradation values of gradation scale data. The sleep waveform generating circuit is configured to generate a sleep waveform to be applied to the actuators. The sleep waveform causes a voltage of the actuators to transition to a first voltage without liquid discharge. The wake waveform generating circuit is configured to generate a wake waveform to be applied to the actuators. The wake waveform causes the voltage of the actuators to transition to a second voltage higher than the first voltage without liquid discharge.

A printing apparatus, having a first head including first nozzles and first driving elements, a second head including second nozzles and second driving elements, first flow paths, a second flow path, and a controller, is provided. The controller is configured to acquire a first printing color gamut and, after loading the second flow path with the ink in the custom color, operate the first and second driving elements to print patches for first imaging color values. The first printing color gamut is a gamut including a custom color within a printing color gamut in a predetermined color space. The printing color gamut is a gamut including color values of colors printable in the inks in basic colors and the custom color. The first imaging color values are color values falling within the first printing color gamut among color values in image data of the image to be printed.