公开(公告)号：US20240176270A1

公开(公告)日：2024-05-30

申请号：US18520070

申请日：2023-11-27

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Hiroshi YAMAZAKI ,  Kenichi TAMAKI ,  Junichi NAKAGAWA ,  Takuji WATANABE

IPC: G03G15/00 ,  G03G15/08 ,  G03G21/20

CPC classification number: G03G15/50 ,  G03G15/0887 ,  G03G21/206

Abstract: The developing device includes a development container, a developer carrier, and a toner trapping mechanism. The development container includes a first conveyance chamber and a second conveyance chamber placed in parallel juxtaposition and communicated with each other at their longitudinal both end portions, and the development container contains a toner-containing developer to be fed to an image carrier. The toner trapping mechanism includes a duct, an air inlet port, an air exhaust port, a filter, and a fan. The air inlet port is placed at a connecting portion between the duct and the second conveyance chamber, and opened along the longitudinal direction of the second conveyance chamber so as to allow air present in the second conveyance chamber to flow into the duct. The air exhaust port is placed downstream of the air inlet port as viewed in a developer conveyance direction of the second conveyance chamber.

公开(公告)号：US20230408976A1

公开(公告)日：2023-12-21

申请号：US18332440

申请日：2023-06-09

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kenichi TAMAKI ,  Hiroshi YAMAZAKI ,  Junichi NAKAGAWA ,  Takuji WATANABE ,  Tamotsu SHIMIZU

IPC: G03G21/20 ,  G03G15/08

CPC classification number: G03G21/206 ,  G03G15/0848

Abstract: Provided is an image forming apparatus in which, while image formation is prevented from being performed, scattered toner that has dropped from a filter and adhered to an outer peripheral surface of a developer carrying member is recovered. A fixed magnet of the developer carrying member has a first pole that is arranged to face the filter, and a second pole and a third pole on a downstream side relative to the first pole. The first pole and the second pole have polarities opposite to each other, and the second pole and the third pole have a same polarity. A length of a gap between the developing container and an area where the developing sleeve faces the second pole among areas of the developing sleeve is smaller than a length between the developing sleeve and the filter.

公开(公告)号：US20230408964A1

公开(公告)日：2023-12-21

申请号：US18332143

申请日：2023-06-09

Applicant: KYOCERA Document Solutions Inc.

Inventor： Junichi NAKAGAWA ,  Tamotsu SHIMIZU ,  Hiroshi YAMAZAKI ,  Kenichi TAMAKI ,  Takuji WATANABE

IPC: G03G21/00 ,  G03G15/08 ,  G03G7/00

CPC classification number: G03G21/0052 ,  G03G15/081 ,  G03G15/0889 ,  G03G15/0808 ,  G03G7/0013 ,  G03G2215/085 ,  G03G2221/0021

Abstract: Provided is an image forming apparatus in which, while image formation is prevented from being performed, scattered toner that has dropped from a filter and adhered to an outer peripheral surface of a developer carrying member is recovered by a cleaning unit through intermediation of an image bearing member. An absolute value of a perpendicular-magnetic-force gradient of a fixed magnet of the developer carrying member is 4.0 mT/° or less at a position where the fixed magnet faces a central portion of the filter in a rotation direction of a developing sleeve.

公开(公告)号：US20230026905A1

公开(公告)日：2023-01-26

申请号：US17858446

申请日：2022-07-06

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Kazunori TANAKA ,  Yasuhiro TAUCHI

IPC: G03G15/00

Abstract: An image forming apparatus includes an amorphous silicon photosensitive member, a developing device including a developer carrying member that carries a two-component developer, and a control portion. When a potential difference V0−Vdc between the photosensitive member and the developer carrying member has a first potential difference at which the toner is moved from the developer carrying member to the photosensitive member and a second potential difference at which the toner is moved from the photosensitive member to the developer carrying member, the control portion adjusts V0 or Vdc so that the first potential difference and the second potential difference are equal in value and opposite in polarity, and a first development current |Ia| that flows at the first potential difference and a second development current |Ib| that flows at the second potential difference satisfy 1.9×10−2≥|Ib|/N≥5.7×103 [μA/mm].

公开(公告)号：US20230022669A1

公开(公告)日：2023-01-26

申请号：US17859669

申请日：2022-07-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Akihiro WATANABE ,  Ryo YAMADA ,  Uto SYU ,  Yuji TOYOTA ,  Yasuhiro TAUCHI

IPC: G03G15/08 ,  G03G15/09

Abstract: A developing device includes a developing container, a first stirring conveyance member, a second stirring conveyance member, a developer carrying member including a developing sleeve and a magnet, and a regulation member. The regulation pole in the magnet has a region extending over 10° or more in which a maximum value of a vertical magnetic force is not more than 65 [mT] and a vertical magnetic force gradient is not more than 0.3 [mT/°]. A peak position of the vertical magnetic force gradient of the regulation pole is arranged at a position opposed to the second stirring conveyance member, and when a value of the vertical magnetic force gradient and a value of the vertical magnetic force at the peak position of the vertical magnetic force gradient are indicated as A [mT/°] and K [mT], respectively, A≥2.8 and A×K≥62.5 are satisfied.

公开(公告)号：US20230019917A1

公开(公告)日：2023-01-19

申请号：US17812097

申请日：2022-07-12

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Yoshihiro YAMAGISHI ,  Kazunori TANAKA

IPC: G03G15/06 ,  G03G15/00

Abstract: An image forming apparatus includes image forming units. A controller includes an execution section, a measurement section, and a prediction section. The execution section controls execution of a developer refresh operation in which toner is ejected from a developer bearing member to an image bearing member so that a specific image forming unit replenishes a development device with the toner from the developer bearing member. The measurement section measures respective surface potentials of the image bearing members included in other image forming units while the specific image forming unit is executing the developer refresh operation. The prediction section uses measurement results of the respective surface potentials of the image bearing members included in the other image forming units for a prediction on the surface potential of the image bearing member included in the specific image forming unit.

公开(公告)号：US20210302859A1

公开(公告)日：2021-09-30

申请号：US17210901

申请日：2021-03-24

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kazunori TANAKA ,  Yoshihiro YAMAGISHI ,  Tamotsu SHIMIZU

IPC: G03G15/02 ,  G03G15/00

Abstract: An image forming apparatus includes: a development device which develops an electrostatic latent image formed on a photosensitive drum into a toner image; a charger which charges the photosensitive drum; a development power supply which applies a prescribed bias voltage to the development device; and a calculating section which calculates a surface potential of the photosensitive drum based on a development current flowing in the development device. The calculating section calculates, as the surface potential, a bias voltage at which a non-charging development current that flows in the development device in an uncharged state in which the charger has not charged the photosensitive drum is equal to a charging development current that flows in the development device in a charged state in which the charger has charged the photosensitive drum.

公开(公告)号：US20210149320A1

公开(公告)日：2021-05-20

申请号：US17098405

申请日：2020-11-15

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Takahiro OKUBO ,  Yohei WAKASA ,  Kazuhiro NAKACHI

IPC: G03G15/06 ,  G03G15/00

Abstract: Provided is an image forming apparatus having a simple configuration capable of measuring a toner current included in a developing current and accurately calculating a toner charge amount based on the measurement result. The developing device has a developer carrier that carries a two-component developer including a magnetic carrier and toner. The density detecting device detects the density of the toner image. The current detecting unit detects a DC component of a developing current that flows when a developing voltage is applied to the developer carrier. The control unit, in a state in which the image carrier is rotated at two or more different linear speeds during non-image formation, forms the same reference image on the image carrier by the developing device, and estimates the toner charge amount based on the developing current when the reference image is formed and the density of the reference image.

公开(公告)号：US20180335748A1

公开(公告)日：2018-11-22

申请号：US15953039

申请日：2018-04-13

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Yoshihiro YAMAGISHI ,  Akifumi YAMAGUCHI ,  Koji UNO ,  Kenichi KASAMA ,  Yuta KITABAYASHI ,  Nobuyuki HAYASHI

IPC: G03G15/00 ,  G03G5/147 ,  G03G5/00

CPC classification number: G03G21/0058 ,  G03G5/005 ,  G03G5/14704 ,  G03G15/0865 ,  G03G15/5008 ,  G03G15/5037 ,  G03G15/55 ,  G03G15/751 ,  G03G21/0011 ,  G03G21/0064 ,  G03G2221/0089

Abstract: An image forming apparatus has a photosensitive member, a charging member, an exposing device, a developing device, a transfer member, a polishing member, a driving device, a voltage applying device, a torque detector, and a control portion. The photosensitive member has a photosensitive layer and a surface protection layer formed on the surface of the photosensitive layer. The polishing member has an elastic layer on its circumferential surface, and rotates with a linear velocity difference from that of the photosensitive member. The torque detector detects the torque of the driving device. The control portion estimates an attachment condition of discharge products to the surface of the photosensitive member based on the torque of the driving device detected by the torque detector. When the torque is equal to or higher than a predetermined value, the control portion performs an image degradation suppression process.

公开(公告)号：US20150293470A1

公开(公告)日：2015-10-15

申请号：US14671344

申请日：2015-03-27

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Akihiro WATANABE ,  Chikara ISHIHARA ,  Yasuhiro TAUCHI ,  Masashi FUJISHIMA ,  Yu SASAKI ,  Hiroaki SAKAI ,  Yasuhiro OISHI ,  Yukimasa WATANABE

IPC: G03G15/08

CPC classification number: G03G15/0808

Abstract: A developing device includes a housing, a development roller, and a roller gear. The roller gear is disposed at one axial end of the development roller and transmits a rotational drive force to the development roller. The development roller includes a sleeve and a coating layer. The coating layer is formed by dipping the sleeve in a dipping bath with the sleeve directed axially vertically. The development roller is mounted to the housing such that a lower axial end of the development roller at the time of the dipping is an opposite axial end to the one axial end at which the roller gear is disposed.

Abstract translation: 显影装置包括壳体，显影辊和辊齿轮。 辊齿轮设置在显影辊的一个轴向端部，并将旋转驱动力传递到显影辊。 显影辊包括套筒和涂层。 通过将套筒浸入浸渍浴中而使套筒轴向垂直地形成涂层。 显影辊安装到壳体上，使得在浸渍时显影辊的下轴向端与设置辊齿轮的一个轴向端相反的轴向端。