Ricoh Company, Ltd.

Nec Corporation

Yamato Scientific Co., Ltd.

Richoh Company, Ltd.

Tomoaki Hayashi

Masahiro Mizuno

Tsuyoshi Nagasu

Masayuki Sunaoshi

Mitsunobu Gohda

Koichi Kudo

Takahiro Inoue

Hideo Goto

Takeo Shirato

Naoki Yoshida

Taiichi Katoh

A liquid ejection apparatus is provided that includes a plurality of liquid ejection head units that are configured to eject liquid onto a conveyed object being conveyed; a detection unit that is provided with respect to each liquid ejection head unit of the plurality of liquid ejection head units and is configured to output a detection result indicating at least one of a position, a moving speed, and an amount of movement of the conveyed object with respect to a conveying direction of the conveyed object; and a control unit configured to control each liquid ejection head unit among the plurality of liquid ejection head units to eject liquid at a timing based on a plurality of the detection results of a plurality of the detection units.

Liquid ejection apparatus, liquid ejection system, and liquid ejection method

A liquid discharge apparatus includes liquid discharge head units, an image sensor, and processing circuitry. The circuitry detects, based on image data detected by the sensor, an amount of deviation between positions on an object onto which liquid has been discharged by the head units; corrects a timing of discharging the liquid, based on the amount of deviation; switches between first control of conveying the object at a first speed while the sensor images the object with a first image size and second control of conveying the object at a second speed faster than the first speed while the sensor images the object with a second image size having a smaller number of pixels; and sets pixel positions of the sensor used for imaging during the second control, according to the amount of deviation detected based on the image data imaged with the first image size by the first control.

Liquid discharge apparatus and detection method

A liquid ejection apparatus includes a plurality of liquid ejection head units that eject liquid onto a conveyed object at different positions along a conveying path; a first support member and a second support member that are respectively provided at an upstream side and a downstream side of a landing position of liquid ejected by a corresponding liquid ejection head unit; a first detection unit that is installed between the first support member and the second support member and is configured to detect a position of the conveyed object in a direction orthogonal to a conveying direction of the conveyed object; a second detection unit that is installed upstream of the first detection unit; and a movement control unit that moves each liquid ejection head unit based on a plurality of detection results output by the first detection unit and/or the second detection unit.

A conveyance apparatus includes a liquid discharge head unit, a conveyance rotator, and a plurality of detection devices. The liquid discharge head unit discharge liquid to an object conveyed in a conveyance direction. The conveyance rotator conveys the object. The plurality of detection devices output a detection result indicating a position of the object. The adjacent two of the plurality of detection devices are spaced at a prescribed distance. The prescribed distance is an integral multiple of a circumference of the conveyance rotator.

Conveyance apparatus and image forming apparatus

A conveying apparatus for conveying a conveyance object in a conveying direction is provided. The conveying apparatus includes a detecting unit configured to detect positions of a plurality of portions in an orthogonal direction of the conveyance object during the conveyance of the conveyance object, the orthogonal direction being orthogonal to the conveying direction; and a determining unit configured to make a determination as to whether the conveyance object has been subjected to expansion or contraction in the orthogonal direction, based on detection results of the positions of the plurality of portions.

Conveying apparatus and image forming apparatus

An image forming apparatus is configured to discharge droplets onto a web to form an image. The image forming apparatus includes a conveyor, a web position detector, and control circuitry. The conveyor is configured to convey the web while applying a tension to the web. The web position detector is configured to detect a position of the web during conveyance. The control circuitry is configured to adjust landing positions of the droplets onto the web in a main scanning direction and a sub-scanning direction in accordance with the position of the web detected by the web position detector and control the tension applied to the web by the conveyor. The web position detector is configured to detect the position of the web in a cycle that is at least twice a tension control cycle in which the control circuitry controls a magnitude of the tension.

Image forming apparatus

A transfer apparatus includes a head unit (C,K) to process an object (W) transferred in a transfer direction, a first support member disposed upstream in the transfer direction with respect to a process position to support the object, a second support member disposed downstream in the transfer direction of the process position to support the object, a surface detector between the first and second support members to detect first surface information of the object, an upstream surface detector disposed upstream in the transfer direction with respect to the surface detector to detect second surface information of the object, an edge detector disposed closer to the upstream surface detector than the surface detector in the transfer direction to detect an edge of the object, and a controller to move the head unit based on detection results of the surface detector and the upstream surface detector and a detection result of the edge detector.

Transfer apparatus, liquid ejection apparatus, reading apparatus, image forming apparatus, control method of the transfer apparatus

A liquid ejection apparatus is provided that includes a plurality of liquid ejection head units that are configured to eject liquid onto a conveyed object being conveyed; a detection unit that is provided with respect to each liquid ejection head unit of the plurality of liquid ejection head units and is configured to output a detection result indicating at least one of a position, a moving speed, and an amount of movement of the conveyed object with respect to a conveying direction of the conveyed object; and a control unit configured to control the each liquid ejection head unit of the plurality of liquid ejection head units to eject liquid at a timing based on a plurality of the detection results of a plurality of the detection units.

A conveyance device includes a conveyor to convey a conveyed object, a head unit to perform an operation on the conveyed object being conveyed at a first conveyance speed, a sensor to acquire data of the conveyed object, a gauge to output a measured travel amount of the conveyed object, and a processor. The processor includes a calculator to calculate a detection result including at least one of a position, a speed of travel, and a calculated travel amount of the conveyed object based on the data acquired by the sensor; and an adjusting unit to adjust a timing of acquisition of the data acquired while the conveyed object is conveyed at the first conveyance speed, based on the detection result and the measured travel amount of the conveyed object being conveyed at a second conveyance speed lower than the first conveyance speed.

Conveyance device, conveyance system, and head unit control method

A detector includes a light source to irradiate an object with light, a sensor to image a first pattern and a second pattern formed on the object with the light irradiated by the light source to generate image data, the first pattern and the second pattern imaged by the sensor at different times, and a circuit to control the light source to adjust a light quantity of the light according to a type of the object and irradiate the object with the light quantity adjusted according to the type of the object, and calculate a relative position of the object between the first pattern and the second pattern.

Detector, image forming apparatus, reading apparatus, and adjustment method

A conveyance device includes a conveyor to convey a conveyed object, a head unit to perform an operation on the conveyed object, a sensor to obtain surface data of the conveyed object, provided for each head unit, and at least one processor. The processor is configured to calculate a first detection result including at least one of a position, a speed of movement, and an amount of movement of the conveyed object based on the surface data, set a detection area based on the first detection result, calculate a second detection result using the detection area according to the first detection result. The processor is further configured to control operation of the at least one head unit based on the second detection result.

Conveyance device, conveyance system, and head control method

A recording device discharge position adjustor includes a recording device to discharge liquid droplets onto a recording medium; an edge detector unit to detect a lateral edge position of the recording medium in a direction perpendicular to a recording medium conveyance direction; a discharge position adjustor to adjust a discharge position of the liquid droplets from the recording device relative to the recording medium; a controller to adjust the discharge position using the discharge position adjustor; and an edge position converter to convert the edge position of the recording medium detected by the edge detector unit to an edge position at a position of the recording device, in which the controller adjusts the discharge position of the recording device by an adjustment amount corresponding to the edge position of the recording medium at the position of the recording device converted by the edge position converter.

Recording device discharge position adjustor and image forming apparatus incorporating same

An image forming apparatus includes a conveyor to convey a conveyed object in a conveyance direction, a plurality of head units to perform image formation on the conveyed object, a displacement sensor disposed downstream from the plurality of head units to detect a position adjustment image on the conveyed object, formed by the plurality of head units, and at least one processor configured to adjust an image formation position of at least one of the head units in a direction orthogonal to the conveyance direction, based on a result generated by the displacement sensor. The image forming apparatus further includes a surface sensor to obtain surface data of the conveyed object at a position corresponding to the head unit to be adjusted, and the processor further adjusts the image formation position in the orthogonal direction based on the surface data obtained by the surface sensor.

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Tokyo, Japan

Tomoaki Hayashi