Patents by Inventor Keigo Nakajima

Keigo Nakajima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200363752
    Abstract: A developing cartridge includes: a casing, a developing roller, a first agitator, a supply roller, and a second agitator. The casing is configured to accommodate toner. The developing roller is rotatable about a developing roller rotation axis extending in a first direction. The first agitator is configured to agitate the toner. The first agitator is rotatable about a first agitator rotation axis extending in the first direction. The supply roller is positioned between the first agitator and the developing roller. The supply roller is rotatable about a supply roller rotation axis extending in the first direction. The second agitator is positioned between the supply roller and the first agitator. The second agitator is rotatable about a second agitator rotation axis extending in the first direction. A rotation locus of the second agitator is positioned outside of a rotation locus of the first agitator.
    Type: Application
    Filed: August 7, 2020
    Publication date: November 19, 2020
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki OOKA, Junichi HASHIMOTO, Shota IRIYAMA, Keigo NAKAJIMA, Kengo YADA
  • Publication number: 20200301351
    Abstract: An image forming apparatus, having a casing, a cover, a first motor, a photosensitive drum, a second motor, a developing motor, a clutch, a contact/separation cam, a switching cam, and a controller, is provided. The controller conducts a first process, in which, when the cover is moved from an open position to a closed position, the controller drives the first motor to rotate the photosensitive drum without causing rotation of the developing roller; and a second process, in which, after a lapse of a first period since the controller started driving the first motor, the controller drives the second motor to move the contact/separation cam from the first phase to the second phase and move the switching cam from the first phase to the second phase causing the developing roller to be moved from the contacting position to the separated position while the photosensitive drum is rotating.
    Type: Application
    Filed: December 20, 2019
    Publication date: September 24, 2020
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki OOKA, Keigo NAKAJIMA, Masahito SAEKI
  • Publication number: 20200285170
    Abstract: A development device includes a layer thickness regulating blade including a support sheet metal, a blade rubber section, and a side edge seal, the support sheet metal having a first end portion, a second end portion, and a center portion between the first end portion and the second end portion, in an axial direction of a development roller. In a width direction of the support sheet metal, the first end portion of the support sheet metal in the axial direction is shorter than the center portion of the support sheet metal in the axial direction. In the width direction, a distal-end edge of the first end portion of the support sheet metal is closer to a base end portion of the support sheet metal than a distal-end edge of the blade rubber section.
    Type: Application
    Filed: September 12, 2019
    Publication date: September 10, 2020
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kengo YADA, Keigo NAKAJIMA, Shota IRIYAMA, Kazuaki OOKA
  • Patent number: 10739698
    Abstract: A developing cartridge includes: a casing, a developing roller, a first agitator, a supply roller, and a second agitator. The casing is configured to accommodate toner. The developing roller is rotatable about a developing roller rotation axis extending in a first direction. The first agitator is configured to agitate the toner. The first agitator is rotatable about a first agitator rotation axis extending in the first direction. The supply roller is positioned between the first agitator and the developing roller. The supply roller is rotatable about a supply roller rotation axis extending in the first direction. The second agitator is positioned between the supply roller and the first agitator. The second agitator is rotatable about a second agitator rotation axis extending in the first direction. A rotation locus of the second agitator is positioned outside of a rotation locus of the first agitator.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: August 11, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki Ooka, Junichi Hashimoto, Shota Iriyama, Keigo Nakajima, Kengo Yada
  • Patent number: 10684584
    Abstract: A development device includes a housing, a development roller, and a layer thickness regulating blade, the layer thickness regulating blade including a support sheet metal and a blade rubber section, the blade rubber section including a contact portion and an extension, the contact portion contacting the development roller, the extension extending from the contact portion, the extension including a curved surface portion having a curved surface, the curved surface being formed to be closer to the support sheet metal in a thickness direction of the support sheet metal as being farther away from the contact portion, the curved surface having a curvature radius equal to or more than 1.5 mm and equal to or less than 3.0 mm, the curved surface portion having a height equal to or less than 1.0 mm in the thickness direction.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: June 16, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Shota Iriyama, Keigo Nakajima, Kengo Yada, Kei Katagiri, Kazuaki Ooka
  • Publication number: 20200103786
    Abstract: A developing cartridge includes: a casing, a developing roller, a first agitator, a supply roller, and a second agitator. The casing is configured to accommodate toner. The developing roller is rotatable about a developing roller rotation axis extending in a first direction. The first agitator is configured to agitate the toner. The first agitator is rotatable about a first agitator rotation axis extending in the first direction. The supply roller is positioned between the first agitator and the developing roller. The supply roller is rotatable about a supply roller rotation axis extending in the first direction. The second agitator is positioned between the supply roller and the first agitator. The second agitator is rotatable about a second agitator rotation axis extending in the first direction. A rotation locus of the second agitator is positioned outside of a rotation locus of the first agitator.
    Type: Application
    Filed: July 1, 2019
    Publication date: April 2, 2020
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki OOKA, Junichi HASHIMOTO, Shota IRIYAMA, Keigo NAKAJIMA, Kengo YADA
  • Patent number: 10452023
    Abstract: There is provided an image forming apparatus including a casing and a drum cartridge. The drum cartridge includes: a photosensitive drum having a circumferential surface which includes a first area and a second area; a first cover which pivotally moves between a first closed position where the first cover covers the first area of the photosensitive drum and a first open position where the first area is exposed; and a second cover which pivotally moves between a second closed position where the second cover covers the second area of the photosensitive drum and a second open position where the second area is exposed. A direction in which the second cover pivotally moves from the second closed position to the second open position is opposite to a direction in which the first cover pivotally moves from the first closed position to the first open position.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: October 22, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Keigo Nakajima, Mayu Wakamatsu, Masatoshi Shiraki, Kei Katagiri, Shota Iriyama
  • Patent number: 10386784
    Abstract: An apparatus main body includes a drum guide configured to guide installation of a drum cartridge into the apparatus main body and a developing guide configured to guide installation of a developing cartridge into the apparatus main body. A downstream end of the developing guide is located farther away from an opening than a downstream end of the drum guide is. The drum cartridge includes a first handle located inside the apparatus main body in a state where the drum cartridge is installed in the apparatus main body. The developing cartridge includes a second handle located inside the apparatus main body in a state where the developing cartridge is installed in the apparatus main body. The handle cover is located between the opening and the first handle to cover the first handle, in a state where the drum cartridge and the developing cartridge are installed in the apparatus main body.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: August 20, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Mayu Wakamatsu, Masatoshi Shiraki, Kei Katagiri, Shota Iriyama, Keigo Nakajima
  • Patent number: 10274862
    Abstract: There is provided an image forming apparatus including: a casing having a drum guide and a developing guide, a drum cartridge having a photosensitive drum and a handle, and a developing cartridge having a developing roller. The developing guide is longer than the drum guide. With the drum cartridge being installed in the casing and with the developing cartridge being removed from the casing, the handle locates at the first position. Further, with the drum cartridge and the developing cartridge being installed in the casing, being pressed by the developing cartridge, the handle locates at the second position farther away from an opening than the first position.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: April 30, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Shota Iriyama, Masatoshi Shiraki, Mayu Wakamatsu, Keigo Nakajima, Kei Katagiri
  • Patent number: 10248072
    Abstract: A cleaning roller includes a shaft and an elastic body. The shaft extends in an axial direction where a center axis of the shaft extends. The shaft defines a radial direction and has a circumferential surface. The elastic body is helically wound about the shaft and defines a helical direction. The elastic body has a widthwise dimension in a widthwise direction orthogonal to the helical direction and to the radial direction. The elastic body has a base end portion extending in the helical direction and a distal end portion extending in the helical direction. The base end portion is in contact with the circumferential surface and fixed thereto. The distal end portion has a sharp edge and is positioned farthest from the circumferential surface in the radial direction. The widthwise dimension is gradually reduced from the base end portion to the distal end portion in the radial direction.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: April 2, 2019
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kengo Yada, Keigo Nakajima, Yuichi Matsushita, Hotaka Kakutani, Shota Iriyama, Atsushi Ozawa
  • Publication number: 20190025755
    Abstract: An apparatus main body includes a drum guide configured to guide installation of a drum cartridge into the apparatus main body and a developing guide configured to guide installation of a developing cartridge into the apparatus main body. A downstream end of the developing guide is located farther away from an opening than a downstream end of the drum guide is. The drum cartridge includes a first handle located inside the apparatus main body in a state where the drum cartridge is installed in the apparatus main body. The developing cartridge includes a second handle located inside the apparatus main body in a state where the developing cartridge is installed in the apparatus main body. The handle cover is located between the opening and the first handle to cover the first handle, in a state where the drum cartridge and the developing cartridge are installed in the apparatus main body.
    Type: Application
    Filed: July 13, 2018
    Publication date: January 24, 2019
    Inventors: Mayu Wakamatsu, Masatoshi Shiraki, Kei Katagiri, Shota Iriyama, Keigo Nakajima
  • Publication number: 20190011851
    Abstract: There is provided an image forming apparatus including: a casing having a drum guide and a developing guide, a drum cartridge having a photosensitive drum and a handle, and a developing cartridge having a developing roller. The developing guide is longer than the drum guide. With the drum cartridge being installed in the casing and with the developing cartridge being removed from the casing, the handle locates at the first position. Further, with the drum cartridge and the developing cartridge being installed in the casing, being pressed by the developing cartridge, the handle locates at the second position farther away from an opening than the first position.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 10, 2019
    Inventors: Shota Iriyama, Masatoshi Shiraki, Mayu Wakamatsu, Keigo Nakajima, Kei Katagiri
  • Publication number: 20190011874
    Abstract: There is provided an image forming apparatus including a casing and a drum cartridge. The drum cartridge includes: a photosensitive drum having a circumferential surface which includes a first area and a second area; a first cover which pivotally moves between a first closed position where the first cover covers the first area of the photosensitive drum and a first open position where the first area is exposed; and a second cover which pivotally moves between a second closed position where the second cover covers the second area of the photosensitive drum and a second open position where the second area is exposed. A direction in which the second cover pivotally moves from the second closed position to the second open position is opposite to a direction in which the first cover pivotally moves from the first closed position to the first open position.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 10, 2019
    Inventors: Keigo Nakajima, Mayu Wakamatsu, Masatoshi Shiraki, Kei Katagiri, Shota Iriyama
  • Publication number: 20180299819
    Abstract: A cleaning roller includes a shaft and an elastic body. The shaft extends in an axial direction where a center axis of the shaft extends. The shaft defines a radial direction and has a circumferential surface. The elastic body is helically wound about the shaft and defines a helical direction. The elastic body has a widthwise dimension in a widthwise direction orthogonal to the helical direction and to the radial direction. The elastic body has a base end portion extending in the helical direction and a distal end portion extending in the helical direction. The base end portion is in contact with the circumferential surface and fixed thereto. The distal end portion has a sharp edge and is positioned farthest from the circumferential surface in the radial direction. The widthwise dimension is gradually reduced from the base end portion to the distal end portion in the radial direction.
    Type: Application
    Filed: June 21, 2018
    Publication date: October 18, 2018
    Inventors: Kengo YADA, Keigo NAKAJIMA, Yuichi MATSUSHITA, Hotaka KAKUTANI, Shota IRIYAMA, Atsushi OZAWA
  • Patent number: 10031467
    Abstract: A cleaning roller includes a shaft and an elastic body. The shaft extends in an axial direction where a center axis of the shaft extends. The shaft defines a radial direction and has a circumferential surface. The elastic body is helically wound about the shaft and defines a helical direction. The elastic body has a widthwise dimension in a widthwise direction orthogonal to the helical direction and to the radial direction. The elastic body has a base end portion extending in the helical direction and a distal end portion extending in the helical direction. The base end portion is in contact with the circumferential surface and fixed thereto. The distal end portion has a sharp edge and is positioned farthest from the circumferential surface in the radial direction. The widthwise dimension is gradually reduced from the base end portion to the distal end portion in the radial direction.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: July 24, 2018
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kengo Yada, Keigo Nakajima, Yuichi Matsushita, Hotaka Kakutani, Shota Iriyama, Atsushi Ozawa
  • Patent number: 9989914
    Abstract: A cleaning roller including a shaft including a rotational axis extending in an axial direction and an elastic layer covering the shaft. The elastic layer includes a base covering the shaft and a first helical protrusion protruding from the base and having a first helical ridge.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: June 5, 2018
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kengo Yada, Yuichi Matsushita, Keigo Nakajima, Hotaka Kakutani, Shota Iriyama, Atsushi Ozawa
  • Publication number: 20170219989
    Abstract: A cleaning roller includes a shaft and an elastic body. The shaft extends in an axial direction where a center axis of the shaft extends. The shaft defines a radial direction and has a circumferential surface. The elastic body is helically wound about the shaft and defines a helical direction. The elastic body has a widthwise dimension in a widthwise direction orthogonal to the helical direction and to the radial direction. The elastic body has a base end portion extending in the helical direction and a distal end portion extending in the helical direction. The base end portion is in contact with the circumferential surface and fixed thereto. The distal end portion has a sharp edge and is positioned farthest from the circumferential surface in the radial direction. The widthwise dimension is gradually reduced from the base end portion to the distal end portion in the radial direction.
    Type: Application
    Filed: February 1, 2017
    Publication date: August 3, 2017
    Inventors: Kengo YADA, Keigo NAKAJIMA, Yuichi MATSUSHITA, Hotaka KAKUTANI, Shota IRIYAMA, Atsushi OZAWA
  • Publication number: 20170219988
    Abstract: A cleaning roller comprises a shaft including a rotational axis extending in an axial direction and an elastic layer covering the shaft. The elastic layer includes a base covering the shaft and a first helical protrusion protruding from the base and having a first helical ridge.
    Type: Application
    Filed: January 31, 2017
    Publication date: August 3, 2017
    Inventors: Kengo YADA, Yuichi MATSUSHITA, Keigo NAKAJIMA, Hotaka KAKUTANI, Shota IRIYAMA, Atsushi OZAWA
  • Patent number: 9020390
    Abstract: A developing device includes: a frame having an opening; a developer carrying member rotatably supported to the frame; and a side seal. The developer carrying member is rotatable about its axis in a rotating direction and has an axial end portion in an axial direction. The side seal is disposed between the frame and a peripheral surface of the axial end portion, and has a contact member contacting the peripheral surface. The contact member includes: a first seal member disposed adjacent to an edge of the opening in the axial direction; and a second seal member disposed adjacent to and upstream of the first seal member in the rotating direction. The first seal member permits developer to move inward in the axial direction and provides a mobility of developer therein higher than that of the second seal member that is made of a material that restricts movement of developer.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: April 28, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Yasuo Fukamachi, Masahiro Ishii, Keigo Nakajima, Takuya Kanda, Kenta Tosuji
  • Patent number: 9014592
    Abstract: A developing device includes: a frame; a developer carrying member rotatably supported to the frame; and a side seal. The developer carrying member is rotatable about its axis in a rotating direction and has an axial end portion and a remaining portion inward of the axial end portion in an axial direction. The side seal is disposed between the frame and a peripheral surface of the axial end portion and includes: a contact member that can contact the peripheral surface; a support member disposed between the contact member and the frame; and a double-sided tape for adhering the contact member to the supporting member. The contact member includes: a first seal member; and a second seal member disposed adjacent to and upstream of the first seal member in the rotating direction. The first seal member and the second seal member are affixed to one adhesive surface of the double-sided tape.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: April 21, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Yasuo Fukamachi, Masahiro Ishii, Keigo Nakajima, Takuya Kanda, Kenta Tosuji