公开(公告)号：US12117755B2

公开(公告)日：2024-10-15

申请号：US18046207

申请日：2022-10-13

申请人： Kanji Ubukata ,  Koji Kiryu ,  Masashi Kasamai ,  Jumpei Yamaguchi ,  Masahiro Ashikawa ,  Nagisa Nakamura

发明人： Kanji Ubukata ,  Koji Kiryu ,  Masashi Kasamai ,  Jumpei Yamaguchi ,  Masahiro Ashikawa ,  Nagisa Nakamura

IPC分类号： G03G15/00 ,  G03G15/01

CPC分类号： G03G15/5025 ,  G03G15/01

摘要： A control device includes circuitry. The circuitry detects density unevenness of a toner image occurring according to a rotation cycle of a plurality of image bearers based on rotation phases and toner image density of the plurality of image bearers, controls rotation phases and rotation speeds of the plurality of image bearers, corrects the rotation phases and the rotation speeds of the plurality of image bearers, controls the rotation speeds of at least two of the plurality of image bearers to be a specified rotation speed, and starts a detection operation of the rotation phases of the plurality of image bearers after a difference between each of the rotation speeds of the at least two of the plurality of image bearers and the specified rotation speed falls within a specified range.

公开(公告)号：US11971675B2

公开(公告)日：2024-04-30

申请号：US18059579

申请日：2022-11-29

申请人： Masashi Kasamai ,  Koji Kiryu ,  Masahiro Ashikawa ,  Jumpei Yamaguchi ,  Kanji Ubukata ,  Nagisa Nakamura

发明人： Masashi Kasamai ,  Koji Kiryu ,  Masahiro Ashikawa ,  Jumpei Yamaguchi ,  Kanji Ubukata ,  Nagisa Nakamura

IPC分类号： G03G15/00

CPC分类号： G03G15/5025

摘要： An image forming apparatus includes image bearers, motors, a reference position detector, and processing circuitry. The circuitry senses a density of a toner image on each bearer; forms an image pattern and senses, based on a detection result of the detector and a sensing result of the density, density unevenness in a rotation cycle and a phase of the density unevenness with respect to a rotational position reference of each bearer; calculates a target phase based on the phase sensed; calculates a relative phase difference based on a rotational position and the target phase of each bearer; selects, as a reference image bearer, an image bearer having a minimum phase correction value, based on a calculation result of the difference; and controls the rotational position of each of the other image bearers with respect to the reference image bearer to the phase correction value, with the motors being driven.

公开(公告)号：US20230195017A1

公开(公告)日：2023-06-22

申请号：US18059579

申请日：2022-11-29

申请人： Masashi Kasamai ,  Koji Kiryu ,  Masahiro Ashikawa ,  Jumpei Yamaguchi ,  Kanji Ubukata ,  Nagisa Nakamura

发明人： Masashi Kasamai ,  Koji Kiryu ,  Masahiro Ashikawa ,  Jumpei Yamaguchi ,  Kanji Ubukata ,  Nagisa Nakamura

IPC分类号： G03G15/00

CPC分类号： G03G15/5025

摘要： An image forming apparatus includes image bearers, motors, a reference position detector, and processing circuitry. The circuitry senses a density of a toner image on each bearer; forms an image pattern and senses, based on a detection result of the detector and a sensing result of the density, density unevenness in a rotation cycle and a phase of the density unevenness with respect to a rotational position reference of each bearer; calculates a target phase based on the phase sensed; calculates a relative phase difference based on a rotational position and the target phase of each bearer; selects, as a reference image bearer, an image bearer having a minimum phase correction value, based on a calculation result of the difference; and controls the rotational position of each of the other image bearers with respect to the reference image bearer to the phase correction value, with the motors being driven.

公开(公告)号：US20230134616A1

公开(公告)日：2023-05-04

申请号：US18046207

申请日：2022-10-13

申请人： Kanji Ubukata ,  Koji Kiryu ,  Masashi Kasamai ,  Jumpei Yamaguchi ,  Masahiro Ashikawa ,  Nagisa Nakamura

发明人： Kanji Ubukata ,  Koji Kiryu ,  Masashi Kasamai ,  Jumpei Yamaguchi ,  Masahiro Ashikawa ,  Nagisa Nakamura

IPC分类号： G03G15/00 ,  G03G15/01

摘要： A control device includes circuitry. The circuitry detects density unevenness of a toner image occurring according to a rotation cycle of a plurality of image bearers based on rotation phases and toner image density of the plurality of image bearers, controls rotation phases and rotation speeds of the plurality of image bearers, corrects the rotation phases and the rotation speeds of the plurality of image bearers, controls the rotation speeds of at least two of the plurality of image bearers to be a specified rotation speed, and starts a detection operation of the rotation phases of the plurality of image bearers after a difference between each of the rotation speeds of the at least two of the plurality of image bearers and the specified rotation speed falls within a specified range.

公开(公告)号：US11803135B2

公开(公告)日：2023-10-31

申请号：US17876562

申请日：2022-07-29

申请人： Nagisa Nakamura ,  Koji Kiryu ,  Masahiro Ashikawa ,  Hiroaki Takagi ,  Jumpei Yamaguchi ,  Masashi Kasamai ,  Kanji Ubukata

发明人： Nagisa Nakamura ,  Koji Kiryu ,  Masahiro Ashikawa ,  Hiroaki Takagi ,  Jumpei Yamaguchi ,  Masashi Kasamai ,  Kanji Ubukata

IPC分类号： G03G5/16 ,  G03G15/00 ,  G03G15/16

CPC分类号： G03G15/1615 ,  G03G15/167 ,  G03G15/5008

摘要： A transfer device includes a plurality of photoconductors, a belt, a plurality of primary transfer rollers and control circuitry. The plurality of primary transfer rollers is disposed for the plurality of photoconductors, respectively. The plurality of primary transfer rollers brings the belt into contact with or separate the belt from the plurality of photoconductors. The control circuitry causes at least one of the plurality of primary transfer rollers to press against a corresponding at least one of the plurality of photoconductors to shift a printing mode.

公开(公告)号：US11789383B2

公开(公告)日：2023-10-17

申请号：US17731280

申请日：2022-04-28

申请人： Jumpei Yamaguchi ,  Koji Kiryu ,  Masahiro Ashikawa ,  Masashi Kasamai ,  Kanji Ubukata ,  Nagisa Nakamura

发明人： Jumpei Yamaguchi ,  Koji Kiryu ,  Masahiro Ashikawa ,  Masashi Kasamai ,  Kanji Ubukata ,  Nagisa Nakamura

IPC分类号： G03G15/16 ,  G03G15/00 ,  G03G15/01

CPC分类号： G03G15/1615 ,  G03G15/0189 ,  G03G15/5008 ,  G03G15/5058 ,  G03G15/55

摘要： An image forming apparatus includes a plurality of image bearers, a plurality of rotation reference position detectors, and circuitry. Each of the plurality of rotation reference position detectors faces a corresponding image bearer of the plurality of image bearers to detect a rotation reference position of the corresponding image bearer. The circuitry performs, before an operation of rotating the plurality of image bearers, alignment control based on a result of detection performed by the plurality of rotation reference position detectors. The alignment control is control of driving of the plurality of image bearers to acquire a given relationship between the respective rotation reference positions of the plurality of image bearers. The circuitry determines whether to perform the alignment control based on whether the operation of rotating the plurality of image bearers is a function maintenance related operation.