Patents by Inventor Kazuaki OOKA

Kazuaki OOKA 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: 20220236689
    Abstract: A photosensitive drum is rotatable about a drum axis extending in a first direction. A frame includes a first side plate located at first end in the first direction and a second side plate spaced from the first side plate in the first direction. The frame rotatably supports the photosensitive drum between the first side plate and the second side plate in the first direction. The frame holds a developer cartridge. A lock lever is pivotable about a pivot axis extending in a second direction intersecting with the first direction. The lock lever is movable between a lock position at which the developer cartridge is locked on the frame and a release position at which the developer cartridge is unlocked from the frame.
    Type: Application
    Filed: April 11, 2022
    Publication date: July 28, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen WANG, Junichi HASHIMOTO, Isao KISHI, Kazuaki OOKA
  • Patent number: 11385563
    Abstract: A developing cartridge includes: a developing roller rotatable about a first axis extending in a first direction; a casing; a first shaft extending in the first direction and movable in the first direction between a first position and a second position; a first inclined surface movable together with the first shaft; a second shaft extending in the first direction and movable in the first direction between a third position and a fourth position; a second inclined surface movable together with the second shaft; and a link mechanism connecting the first shaft to the second shaft. The link mechanism shifts to a first state to move the second shaft to the third position when the first shaft is at the first position. The link mechanism shifts to a second state to move the second shaft to the fourth position when the first shaft is at the second position.
    Type: Grant
    Filed: July 13, 2021
    Date of Patent: July 12, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Kazuaki Ooka
  • Publication number: 20220206428
    Abstract: An image forming apparatus includes: a process cartridge; and an apparatus main body to which the process cartridge is attachable and from which the process cartridge is detachable. The process cartridge includes: a photoconductive drum, and an electrode connected to the photoconductive drum and having a contact surface facing downward. The apparatus main body includes: a support frame supporting one end portion of the process cartridge in an axis direction of the photoconductive drum, a ground metal plate supported by the support frame and connected to ground, and a spring supported by the support frame and configured to contact with the contact surface of the electrode from below to connect the electrode and the ground metal plate.
    Type: Application
    Filed: August 10, 2021
    Publication date: June 30, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki OOKA, Hikaru IINO
  • Publication number: 20220146960
    Abstract: A developing roller is located nearer a first end than a second end in a first direction. A first boss extends in a second direction and is movable together with a housing. The first boss bears the weight of a developer cartridge when the first boss is supported by a support surface of a first side plate of a drum unit, and is located away from the developing roller in the first direction and the third direction. A first pressure receiving surface is located farther away from the developing roller than the first boss in the third direction. The pressure receiving member receives a pressing force in the third direction from a pressing member of the first side plate of the drum unit. The first boss is located away from the developing roller in the first direction by a first distance. The first pressure receiving surface is located away from the developing roller in the first direction by the first distance or by a second distance smaller than the first distance.
    Type: Application
    Filed: January 20, 2022
    Publication date: May 12, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen WANG, Kazuaki OOKA, Isao KISHI, Junichi HASHIMOTO
  • Publication number: 20220137549
    Abstract: A developing cartridge includes: a casing; a developing roller; a shaft; and a cam. The casing is configured to accommodate developer therein. The developing roller is rotatable about a first axis extending in an axial direction. The shaft extends along a second axis extending in the axial direction. The shaft is movable along the second axis. The cam is movable along the second axis in response to axial movement of the shaft. The cam has a cam surface non-parallel with the second axis.
    Type: Application
    Filed: January 12, 2022
    Publication date: May 5, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen WANG, Junichi HASHIMOTO, Isao KISHI, Kazuaki OOKA
  • Patent number: 11320779
    Abstract: A photosensitive drum is rotatable about a drum axis extending in a first direction. A frame includes a first side plate located at first end in the first direction and a second side plate spaced from the first side plate in the first direction. The frame rotatably supports the photosensitive drum between the first side plate and the second side plate in the first direction. The frame holds a developer cartridge. A lock lever is pivotable about a pivot axis extending in a second direction intersecting with the first direction. The lock lever is movable between a lock position at which the developer cartridge is locked on the frame and a release position at which the developer cartridge is unlocked from the frame.
    Type: Grant
    Filed: February 12, 2021
    Date of Patent: May 3, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen Wang, Junichi Hashimoto, Isao Kishi, Kazuaki Ooka
  • Patent number: 11256208
    Abstract: A developing cartridge includes: a casing; a developing roller; a shaft; and a cam. The casing is configured to accommodate developer therein. The developing roller is rotatable about a first axis extending in an axial direction. The shaft extends along a second axis extending in the axial direction. The shaft is movable along the second axis. The cam is movable along the second axis in response to axial movement of the shaft. The cam has a cam surface non-parallel with the second axis.
    Type: Grant
    Filed: March 18, 2021
    Date of Patent: February 22, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen Wang, Junichi Hashimoto, Isao Kishi, Kazuaki Ooka
  • Patent number: 11249418
    Abstract: A developing roller is located nearer a first end than a second end in a first direction. A first boss extends in a second direction and is movable together with a housing. The first boss bears the weight of a developer cartridge when the first boss is supported by a support surface of a first side plate of a drum unit, and is located away from the developing roller in the first direction and the third direction. A first pressure receiving surface is located farther away from the developing roller than the first boss in the third direction. The pressure receiving member receives a pressing force in the third direction from a pressing member of the first side plate of the drum unit. The first boss is located away from the developing roller in the first direction by a first distance. The first pressure receiving surface is located away from the developing roller in the first direction by the first distance or by a second distance smaller than the first distance.
    Type: Grant
    Filed: December 3, 2020
    Date of Patent: February 15, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen Wang, Kazuaki Ooka, Isao Kishi, Junichi Hashimoto
  • Publication number: 20220004118
    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: September 16, 2021
    Publication date: January 6, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki OOKA, Junichi HASHIMOTO, Shota IRIYAMA, Keigo NAKAJIMA, Kengo YADA
  • Patent number: 11204579
    Abstract: A drawer includes: a photosensitive drum; and a frame to which a developing cartridge is attachable. The photosensitive drum is rotatable about a rotational axis extending in an axial direction. The photosensitive drum has an outer circumferential surface. The developing cartridge includes a developing roller having an outer circumferential surface. The developing cartridge is attachable to the frame in a state where the outer circumferential surface of the developing roller faces the outer circumferential surface of the photosensitive drum. The frame is configured to move the developing roller in a separation direction in response to movement in the axial direction of at least a portion of the developing cartridge attached to the frame. The separation direction is a direction in which the outer circumferential surface of the developing roller separates from the outer circumferential surface of the photosensitive drum.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: December 21, 2021
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen Wang, Junichi Hashimoto, Isao Kishi, Kazuaki Ooka
  • Publication number: 20210349421
    Abstract: A developing cartridge includes a developing roller, a casing, and a cam. The developing roller is configured to be positioned at a contact position where the developing roller is in contact with a photosensitive drum of a drum cartridge. The developing roller is also configured to be positioned at a separated position where the developing roller is separated from the photosensitive drum. The cam is movable relative to the casing between a first position and a second position. A portion of the developing cartridge is in contact with the drum cartridge and functions as a pivot center so that the casing and the developing roller are pivotally moved about the pivot center when the cam is moved from the first position to the second position.
    Type: Application
    Filed: July 21, 2021
    Publication date: November 11, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Kazuaki OOKA
  • Publication number: 20210341855
    Abstract: A developing cartridge includes: a developing roller rotatable about a first axis extending in a first direction; a casing; a first shaft extending in the first direction and movable in the first direction between a first position and a second position; a first inclined surface movable together with the first shaft; a second shaft extending in the first direction and movable in the first direction between a third position and a fourth position; a second inclined surface movable together with the second shaft; and a link mechanism connecting the first shaft to the second shaft. The link mechanism shifts to a first state to move the second shaft to the third position when the first shaft is at the first position. The link mechanism shifts to a second state to move the second shaft to the fourth position when the first shaft is at the second position.
    Type: Application
    Filed: July 13, 2021
    Publication date: November 4, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Kazuaki OOKA
  • Patent number: 11143981
    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: January 19, 2021
    Date of Patent: October 12, 2021
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki Ooka, Junichi Hashimoto, Shota Iriyama, Keigo Nakajima, Kengo Yada
  • Publication number: 20210311429
    Abstract: A cartridge includes: a housing; a storage medium; and a holder. The storage medium has an electrical contact surface. The holder is movable relative to the housing. The holder includes: a first holder member; and a second holder member. The first holder member has a pawl portion and is configured to hold the electrical contact surface. The second holder member includes a corner portion. The pawl portion is engageable with the corner portion. The second holder member has a through-hole. An engagement part of the pawl portion engaging with the corner portion is accessible from outside the second holder member through the through-hole in a state where the pawl portion engages with the corner portion.
    Type: Application
    Filed: March 30, 2021
    Publication date: October 7, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Nao ITABASHI, Kazuya KAMIKAWA, Shuhei HATANO, Kazuaki OOKA
  • Publication number: 20210255567
    Abstract: A developing cartridge includes a casing, a developing roller, a supply roller, a first agitator and a second agitator. The casing is configured to accommodate toner therein. The supply roller is configured to supply the toner to the developing roller. The first agitator is configured to agitate the toner in the casing. The second agitator is configured to agitate the toner in the casing. The second agitator is positioned between the first agitator and the supply roller. The second agitator includes a blade having a tip end configured to contact a peripheral surface of the supply roller.
    Type: Application
    Filed: January 28, 2021
    Publication date: August 19, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Hotaka KAKUTANI, Kazuaki OOKA, Kengo YADA, Ayaka KOMORI, Shota IRIYAMA, Keigo NAKAJIMA, Junichi HASHIMOTO
  • Patent number: 11061357
    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: Grant
    Filed: December 20, 2019
    Date of Patent: July 13, 2021
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki Ooka, Keigo Nakajima, Masahito Saeki
  • Publication number: 20210208532
    Abstract: A developing cartridge includes: a casing; a developing roller; a shaft; and a cam. The casing is configured to accommodate developer therein. The developing roller is rotatable about a first axis extending in an axial direction. The shaft extends along a second axis extending in the axial direction. The shaft is movable along the second axis. The cam is movable along the second axis in response to axial movement of the shaft. The cam has a cam surface non-parallel with the second axis.
    Type: Application
    Filed: March 18, 2021
    Publication date: July 8, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen WANG, Junichi HASHIMOTO, Isao KISHI, Kazuaki OOKA
  • Publication number: 20210165361
    Abstract: A photosensitive drum is rotatable about a drum axis extending in a first direction. A frame includes a first side plate located at first end in the first direction and a second side plate spaced from the first side plate in the first direction. The frame rotatably supports the photosensitive drum between the first side plate and the second side plate in the first direction. The frame holds a developer cartridge. A lock lever is pivotable about a pivot axis extending in a second direction intersecting with the first direction. The lock lever is movable between a lock position at which the developer cartridge is locked on the frame and a release position at which the developer cartridge is unlocked from the frame.
    Type: Application
    Filed: February 12, 2021
    Publication date: June 3, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen WANG, Junichi HASHIMOTO, Isao KISHI, Kazuaki OOKA
  • Publication number: 20210165342
    Abstract: A developing roller is located nearer a first end than a second end in a first direction. A first boss extends in a second direction and is movable together with a housing. The first boss bears the weight of a developer cartridge when the first boss is supported by a support surface of a first side plate of a drum unit, and is located away from the developing roller in the first direction and the third direction. A first pressure receiving surface is located farther away from the developing roller than the first boss in the third direction. The pressure receiving member receives a pressing force in the third direction from a pressing member of the first side plate of the drum unit. The first boss is located away from the developing roller in the first direction by a first distance. The first pressure receiving surface is located away from the developing roller in the first direction by the first distance or by a second distance smaller than the first distance.
    Type: Application
    Filed: December 3, 2020
    Publication date: June 3, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yuwen WANG, Kazuaki OOKA, Isao KISHI, Junichi HASHIMOTO
  • Publication number: 20210141320
    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: January 19, 2021
    Publication date: May 13, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki OOKA, Junichi HASHIMOTO, Shota IRIYAMA, Keigo NAKAJIMA, Kengo YADA