A liquid ejection apparatus includes: an ejection unit that ejects from an ejection port a liquid in a pressure chamber communicating with the ejection port; a first flow channel that allows for communication between the pressure chamber and a liquid supply unit; a second flow channel communicating with the pressure chamber; a liquid transportation chamber communicating with a connection flow channel communicating with the first flow channel and the second flow channel; a liquid transportation unit that flows the liquid in the liquid transportation chamber in a predetermined direction by expanding and contracting the liquid transportation chamber with application of a driving voltage including a step-up waveform and a step-down waveform; and a control unit that performs control such that a liquid ejection timing does not coincide with a voltage application period in which one of the step-up and step-down waveforms that has a greater voltage change rate is applied.

A liquid ejection apparatus includes a liquid ejection unit with a plurality of nozzles and a corresponding plurality of actuators. A drive waveform generation circuit is configured to generate drive waveforms having different drive timings. An actuator drive circuit is configured to apply a first drive waveform to a first actuator in a liquid ejection operation and a second drive waveform to a second actuator in the liquid ejection operation during which the first and second actuators are to be driven at a same nominal time. The first driving waveform is different from the second drive waveform, and the first actuator is at a position electrically closer along a predetermined direction to a power supply electrode than is the second actuator.

A liquid ejection apparatus includes a controller configured to perform: causing a voltage application circuit to apply a voltage between a liquid ejection head having a plurality of nozzles and an electrode; driving the liquid ejection head for causing a certain nozzle to eject liquid toward a cap in a state where the plurality of nozzles face the cap; receiving a signal from a signal output circuit; determining, based on the received signal, whether the certain nozzle has ejected liquid normally; determining, based on the received signal, whether a leakage current has occurred between the certain nozzle and the electrode; and specifying the certain nozzle as a leakage nozzle if the leakage current has occurred between the certain nozzle and the electrode.

A processing device including a hardware processor that: determines a dot position at which a dot is to be generated by multiple recording elements arranged in a first direction on a medium which moves relative to the recording elements in a second direction crossing the first direction, based on tone data for each pixel of an image to be formed; determines a corrected dot number that is a number of a dot position by a malfunctioning recording element to which an offset number is added, wherein the malfunctioning recording element is set as a recording element by which a dot is not generated normally among the recording elements; and determines the corrected dot number of a dot position within a dot generation possible range by a recording element other than the malfunctioning recording element.

A liquid jetting device is arranged to eject a droplet of a liquid. The device includes a nozzle, a liquid duct connected to the nozzle, an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, and an electronic control system arranged to apply to the transducer a voltage signal having a waveform configured for ejecting a droplet from the nozzle. The waveform is further configured to quench a residual acoustic pressure wave in the liquid duct and includes a jet pulse, a subsequent first quench pulse having a polarity opposite to that of the jet pulse, and a subsequent second quench pulse having the same polarity as the jet pulse.

A liquid ejection apparatus includes a transmission-side control device and a reception-side control device. The transmission-side control device is configure to: divide image data into a plurality of division data; add check data for error detection to each of the plurality of division data; and transmit, to a reception-side control device, each of the plurality of division data to which respective check data are added. The reception-side control device is configured to: receive each of the plurality of division data to which the respective check data are added; perform error detection on each of the plurality of division data, using check data added to the division data; and transmit, to a drive device configured to control a drive element, division data on which a process of error detection is performed, in parallel with a process of transmitting division data by the transmission-side control device.

A digital printing system includes a print head and a processor. The print head is configured to jet droplets of ink. The a processor is further configured to translate a required shade of a color, to be printed at a given location on a substrate by the print head, into a sequence of pulses, the sequence including: (a) up to a predefined maximum number of driving pulses that cause the print head to jet respective droplets, and (b) a tickling pulse, which has a smaller amplitude than the driving pulses and which causes the print head to jet a droplet smaller than the droplets jetted in response to the driving pulses. The processor is additionally configured to apply the sequence of pulses to the print head.

An ink jet recording method according to the present embodiment includes ejecting a water-based ink composition where a content of an organic solvent having a standard boiling point of 280° C. or more is 0.5% by mass or less from a head nozzle and attaching the water-based ink composition to a recording medium, in which a contact angle between at least a part of the surface of the member in contact with the water-based ink composition in the members in the head and the water-based ink composition is 30° or less, and the surface of the member in contact with the water-based ink composition is formed of a material having an SP value of 9 or less.

A liquid ejection head includes a nozzle for ejecting a droplet of a liquid, a pressure chamber connected to the nozzle, an actuator for changing a volume of the chamber according to a voltage signal, and a drive circuit generating the signal for ejecting n droplets, where n is an integer of 3 or more. The signal includes (n−1) ejection pulses, comprising a first pulse lowering the voltage signal to a first value to expand the chamber and then to a second value to contract the chamber, and a second pulse lowering the voltage signal to the first value and then to a third value higher than the second value. The pulses are input at intervals of 0.8λ to 1.2λ, where λ is a primary natural vibration period of the chamber filled with the liquid.

A liquid discharge apparatus includes a head and circuitry. The head discharges liquid to apply the liquid to an application surface. The circuitry controls discharge of the liquid from the head based on a vertical height of an application position at which the liquid is applied on the application surface.