Ricoh Company, Ltd.

Kohtaroh Ikegami

Takayuki Ito

Nobuyuki Satoh

Suguru Yokozawa

Hiroki Takahashi

Tomohiro Mizutani

Hirohito Murate

Katsuhiro Tobita

Kohhei Yamaguchi

Takeo Shirato

Takatsugu Maeda

Kohsuke Inoue

Ryuichi Hayashi

Shogo Miura

Yasuyuki Horie

Kenta Sasaki

A liquid discharge apparatus includes a discharge head having a nozzle row, a conveyor is configured to convey a discharge target medium, a head mover configured to move the discharge head in an orthogonal direction, a head rotator configured to rotate the discharge head, and circuitry configured to perform a position setting operation to cause the head mover to move the discharge head to a position in the orthogonal direction, a discharging operation to cause the discharge head to discharge a liquid at the position, a medium conveying operation to cause the conveyor to convey the discharge target medium, and a changing operation to cause the head mover to change the position of the discharge head, and cause the head rotator to rotate the discharge head based on a length of droplets of the liquid landed on the discharge target medium by the above-described operations.

Liquid discharge apparatus and method for adjusting discharge head in the liquid discharge apparatus

A liquid discharge apparatus includes a head including a row of a plurality of nozzles configured to discharge a liquid. The liquid discharge apparatus further includes circuitry configured to generate a discharge timing in accordance with movement of a linear object to which the head applies the liquid, apply a drive waveform to the head based on the discharge timing, and apply a micro vibrating pulse to the head after application of a discharge pulse for discharging the liquid and before a subsequent discharge timing. The micro vibrating pulse is for vibrating a meniscus of the nozzle.

Liquid discharge apparatus, dyeing apparatus, and head drive method

A liquid discharge apparatus includes a liquid discharge head having at least one nozzle array including a plurality of nozzles lined in a nozzle array direction; a two-dimensional image sensor to capture an image formed by the liquid discharge head; and circuitry. The circuitry is configured to divide the nozzles into a plurality of nozzle units; form a pattern including a plurality of unit patterns with liquid discharged from the nozzle units, respectively; and detect a defective nozzle based on a captured image of each of the unit patterns. The unit patterns are arranged in a staggered manner. Each unit pattern is smaller in size than an image capture range of the two-dimensional image sensor. Each unit pattern includes a number of columns of lines extending in a direction perpendicular to the nozzle array direction, and the number of columns is not smaller than twice the number of nozzle arrays.

Liquid discharge apparatus, defective nozzle detection method, and recording medium

A liquid discharge device includes a liquid discharge head to discharge liquid and circuitry configured to generate a drive waveform to drive the liquid discharge head. The circuitry converts, to an analog signal, drive waveform voltage data being a source of the drive waveform; amplifies in voltage the analog signal to generate a drive waveform voltage signal; amplifies in current the drive waveform voltage signal to generate the drive waveform; monitors the drive waveform to detect an abnormality of the drive waveform; controls an operation of the liquid discharge device based on a result of detection of the abnormality of the drive waveform; compares an output of the voltage amplifier and an output of the current amplifier to output a difference between the output of the voltage amplifier and the output of the current amplifier; and outputs a binarized signal based on the difference.

Liquid discharge device and liquid discharge apparatus

A controller for a liquid discharging device generates a correction chart including a reference pattern and a correction part, using a liquid discharged from a liquid discharge head, the liquid discharge head having a plurality of nozzles that are arranged to form a nozzle array. The controller drives a predetermined number of the plurality of nozzles to form the reference pattern on the recording sheet along a direction of the nozzle array, the predetermined number being a number equal to or less than a total number of the plurality of nozzles of the nozzle array, and drives a number of the plurality of nozzles that is different than the predetermined number of nozzles driven in forming the reference pattern, to form the correction pattern on the recording sheet along the direction of the nozzle array.

Liquid discharging device, correction chart generating method, and recording medium

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Kanagawa, Japan

Kohtaroh Ikegami