Patents by Inventor Yusuke Ikegami

Yusuke Ikegami 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).

  • Patent number: 11415931
    Abstract: A branch frame has a first guide surface and a second guide surface. In a state where a first cover is located at an open position, at least part of the first cover is located in a space through which a fixing device passes when the fixing device is detached from a mount portion, and the fixing device is unattachable to and undetachable from the mount portion through a first opening. In a state where the branch frame is attached to a main housing, at least part of the branch frame is located in the space, and the fixing device is unattachable to and undetachable from the mount portion through the first opening. In a state where the first cover and the branch frame are detached from the main housing, the fixing device is attachable to and detachable from the mount portion through the first opening.
    Type: Grant
    Filed: July 26, 2021
    Date of Patent: August 16, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke Ikegami, Yuichiro Ichinose
  • Patent number: 11415927
    Abstract: An image forming apparatus according to aspects of the present disclosure includes a cover, an interlocking mechanism, a sensor, a separation mechanism, a controller. In a state where the cover moves from a closed position to an open position while no power is supplied to the controller, a state of the interlocking mechanism changes from a first state to a second state. In a state where the sensor does not detect that the interlocking mechanism is in the second state when power supply to the controller is started, the separation mechanism keeps the developing roller located at a separation position at the separation position. On the other hand, in a state where the sensor detects that the interlocking mechanism is in the second state when power supply to the controller is started, the separation mechanism moves the developing roller located at a contact position to the separation position.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: August 16, 2022
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Yusuke Ikegami, Shintaro Sakaguchi, Kotaro Haruta
  • Patent number: 11402769
    Abstract: An image forming apparatus includes a housing having an opening, a cover configured to openably close the opening, photosensitive drums, cartridges, a first motor and a controller. Each cartridge has a developing roller, a storage chamber configured to store toner, and an agitator configured to agitate the toner. The first motor is configured to rotate the agitators. The controller rotates the agitators by rotating the first motor when forming an image on a sheet. The controller determines whether a new cartridge is included in the plurality of cartridges in response to the image forming apparatus being turned on or in response to the cover being closed. In a case where a new cartridge is included, the controller stirs toner with the agitators by rotating the first motor. In a case where a new cartridge is not included, the controller does not stir the toner.
    Type: Grant
    Filed: June 18, 2021
    Date of Patent: August 2, 2022
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Yusuke Ikegami, Shintaro Sakaguchi, Kotaro Haruta, Yuwen Wang
  • Publication number: 20220221815
    Abstract: A controller is configured to control a print engine and a conveyor to form an image on both sides of a sheet. The controller is configured to: in a case where images to be formed on both sides of each of an Nth (N is a positive integer) sheet, an (N+1)th sheet, and an (N+2)th sheet are all monochrome image or all color image, convey the (N+2)th sheet to the print engine and form an image before forming an image on both sides of the (N+1)th sheet; and in a case where the images to be formed on both sides of each of the Nth sheet, the (N+1)th sheet, and the (N+2)th sheet are a mixture of the monochrome image and the color image, convey the (N+2)th sheet to the print engine and form an image after forming an image on both sides of the (N+1)th sheet.
    Type: Application
    Filed: January 13, 2022
    Publication date: July 14, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Shintaro SAKAGUCHI, Yusuke IKEGAMI, Yasuhiro SUZUKI, Saya MINOSHIMA
  • Patent number: 11378895
    Abstract: A controller is configured to: when an inter-sheet time is shorter than or equal to a first time, maintain a developing roller in contact with a photosensitive drum during an inter-sheet time; when the inter-sheet time is longer than the first time and shorter than or equal to a second time longer than the first time, perform, during the inter-sheet time, at least part of temporary separation processing of temporarily separating the developing roller from the photosensitive drum in a state where the photosensitive drum is rotating; and when the inter-sheet time is longer than the second time, perform, during the inter-sheet time, at least part of temporary stop processing of separating the developing roller from the photosensitive drum and then stopping rotation of the photosensitive drum, and subsequently restarting rotation thereof and then bringing the developing roller into contact with the photosensitive drum.
    Type: Grant
    Filed: February 9, 2021
    Date of Patent: July 5, 2022
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Toshiyuki Sano, Yusuke Ikegami, Junya Sumida, Chieko Mimura, Shintaro Sakaguchi
  • Patent number: 11372362
    Abstract: An image forming apparatus includes a developing roller, a photo-interrupter, and a separation mechanism. The developing roller is movable between a contact position and a separated position. The photo-interrupter includes a light emitting element and a light receiving element. The separation mechanism includes a cam configured to move the developing roller between the contact position and the separated position. The cam includes a phase detection wall extending in a circumference direction. The phase detection wall has a first slit and a second slit. The first slit allows the light emitted from the light emitting element to pass therethrough when the developing roller is at the separated position. The second slit allows the light emitted from the light emitting element to pass therethrough when the developing roller is at the contact position. A size of the first slit in the circumferential direction is different from that of the second slit.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: June 28, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke Ikegami, Masahito Saeki, Toshiyuki Sano, Shintaro Sakaguchi
  • Publication number: 20220163907
    Abstract: A transfer belt unit for use with an image forming apparatus includes: a transfer belt; and a belt memory. The transfer belt is configured to transfer toner on a photosensitive drum of the image forming apparatus onto a sheet conveyed to a portion between the photosensitive drum and the transfer belt. The transfer belt is also configured to make contact with a cleaning roller of the image forming apparatus and to be cleaned by the cleaning roller. The belt memory includes: a first storage area configured to store therein a first rotation time period indicating a total of a period of time that the cleaning roller rotates at a first rotational speed; and a second storage area configured to store therein a second rotation time period indicating a total of a period of time that the cleaning roller rotates at a second rotational speed faster than the first rotational speed.
    Type: Application
    Filed: November 23, 2021
    Publication date: May 26, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke IKEGAMI, Shintaro SAKAGUCHI
  • Patent number: 11334022
    Abstract: An image forming apparatus includes a photosensitive drum, a developing roller, a cam, a developing motor, a first transmission mechanism, and a second transmission mechanism. The cam moves the developing roller between a contacting position where the developing roller is in contact with the photosensitive drum and a separated position where the developing roller is separated from the photosensitive drum. The developing motor drives both the developing roller and the cam, and is rotatable in a normal rotating direction and a reverse rotating direction. The first transmission mechanism engages power transmission from the developing motor to the developing roller when the developing motor rotates in the normal rotating direction, and disengages the power transmission when the developing motor rotates in the reverse rotating direction. The second transmission mechanism can engage power transmission from the developing motor to the cam, irrespective of the rotating direction of the developing motor.
    Type: Grant
    Filed: May 21, 2021
    Date of Patent: May 17, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke Ikegami, Masahito Saeki, Shintaro Sakaguchi, Toshiyuki Sano
  • Patent number: 11281153
    Abstract: An image forming apparatus, having a first photosensitive drum, a second photosensitive drum, a first developing roller, a second developing roller, a first moving mechanism, a second moving mechanism, a driving gear, a motor, a first gear train, a second gear train, and a third gear train, is provided. The first gear train having a first gear transmits a driving force from the motor to the first developing roller. The second gear train having a second gear transmits the driving force from the motor to the second developing roller. The second gear train is provided separately from the first gear train. The third gear train having a third gear transmits the driving force from the motor to at least one of the first moving mechanism and the second moving mechanism. The third gear train is provided separately from the first gear train and the second gear train.
    Type: Grant
    Filed: March 25, 2021
    Date of Patent: March 22, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke Ikegami, Kotaro Haruta, Shoichiro Nishimura
  • Publication number: 20220082975
    Abstract: An image forming apparatus includes: a photosensitive drum; a developing roller; a separation mechanism configured to switch a state of the photosensitive drum and the developing roller between a contact state and a separation state; a main memory storing therein a first rotation number and a second rotation number; and a controller configured to perform calculating a deterioration quantity of the photosensitive drum based on the first rotation number and the second rotation number in the main memory. A surface of the developing roller contacts a surface of the photosensitive drum in the contact state, whereas the surface of the developing roller is separated from the surface of the photosensitive drum in the separation state. The first rotation number is the number of rotations of the photosensitive drum in the contact state, and the second rotation number is the number of rotations of the photosensitive drum in the separation state.
    Type: Application
    Filed: August 30, 2021
    Publication date: March 17, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Chieko MIMURA, Yusuke IKEGAMI, Shintaro SAKAGUCHI
  • Publication number: 20220066354
    Abstract: An image forming apparatus includes a housing having an opening, a cover configured to openably close the opening, photosensitive drums, cartridges, a first motor and a controller. Each cartridge has a developing roller, a storage chamber configured to store toner, and an agitator configured to agitate the toner. The first motor is configured to rotate the agitators. The controller rotates the agitators by rotating the first motor when forming an image on a sheet. The controller determines whether a new cartridge is included in the plurality of cartridges in response to the image forming apparatus being turned on or in response to the cover being closed. In a case where a new cartridge is included, the controller stirs toner with the agitators by rotating the first motor. In a case where a new cartridge is not included, the controller does not stir the toner.
    Type: Application
    Filed: June 18, 2021
    Publication date: March 3, 2022
    Applicant: Brother Kogyo Kabushiki Kaisha
    Inventors: Yusuke IKEGAMI, Shintaro Sakaguchi, Kotaro Haruta, Yuwen Wang
  • Patent number: 11262684
    Abstract: A first transport unit transports, along a first path, a sheet transported from an image forming unit. A second transport unit transports the sheet along a second transport path branched from a junction with the first transport path. A first cover, when open, holds the sheet transported to an exterior of a housing and, when closed, partially constitutes the second transport unit. A flap is disposed at the junction and, when at a first position, blocks the second transport path and guides the sheet along the first transport path and, when at a second position, blocks the first transport path and guides the sheet along the second transport path. A drive unit moves the flap between the first position and the second position. A moving mechanism moves away from the flap in response to closing of the first cover, and pushes and moves the flap to the second position.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: March 1, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke Ikegami, Kazuya Kamikawa
  • Patent number: 11256190
    Abstract: A controller is configured to, when forming an image on one sheet, in a case where a length of one sheet in a conveyance direction is larger than a first length, drive a moving mechanism to move a plurality of developing rollers from a separation position to a contact position, temporarily stop driving of the moving mechanism, and then, at a first timing, again drive the moving mechanism to move the plurality of developing rollers from the contact position to the separation position; and in a case where the length of the one sheet in the conveyance direction is smaller than or equal to the first length, drive the moving mechanism to move the plurality of developing rollers from the separation position to the contact position and then to move the plurality of developing rollers from the contact position to the separation position without stopping driving of the moving mechanism.
    Type: Grant
    Filed: December 17, 2020
    Date of Patent: February 22, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke Ikegami, Shintaro Sakaguchi, Toshiyuki Sano
  • Publication number: 20220035306
    Abstract: A branch frame has a first guide surface and a second guide surface. In a state where a first cover is located at an open position, at least part of the first cover is located in a space through which a fixing device passes when the fixing device is detached from a mount portion, and the fixing device is unattachable to and undetachable from the mount portion through a first opening. In a state where the branch frame is attached to a main housing, at least part of the branch frame is located in the space, and the fixing device is unattachable to and undetachable from the mount portion through the first opening. In a state where the first cover and the branch frame are detached from the main housing, the fixing device is attachable to and detachable from the mount portion through the first opening.
    Type: Application
    Filed: July 26, 2021
    Publication date: February 3, 2022
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke IKEGAMI, Yuichiro ICHINOSE
  • Publication number: 20220019168
    Abstract: An image forming apparatus according to aspects of the present disclosure includes a cover, an interlocking mechanism, a sensor, a separation mechanism, a controller. In a state where the cover moves from a closed position to an open position while no power is supplied to the controller, a state of the interlocking mechanism changes from a first state to a second state. In a state where the sensor does not detect that the interlocking mechanism is in the second state when power supply to the controller is started, the separation mechanism keeps the developing roller located at a separation position at the separation position. On the other hand, in a state where the sensor detects that the interlocking mechanism is in the second state when power supply to the controller is started, the separation mechanism moves the developing roller located at a contact position to the separation position.
    Type: Application
    Filed: June 11, 2021
    Publication date: January 20, 2022
    Applicant: Brother Kogyo Kabushiki Kaisha
    Inventors: Yusuke IKEGAMI, Shintaro SAKAGUCHI, Kotaro HARUTA
  • Patent number: 11226579
    Abstract: An image forming apparatus, having first, second, third, and fourth photosensitive drums, first, second, third, and fourth developing rollers, a development-driving gear, a development motor, a first development gear train having a first gear, a second development-gear train having a second gear, a process-driving gear, a process motor, a first process-gear train having a third gear, and a second process gear-train having a fourth gear, is provided. The first development-gear train transmits a driving force from the development motor to the first and second developing rollers. The second development-gear train transmits the driving force from the development motor to the third and fourth developing rollers. The first process-gear train transmits a driving force from the process motor to the first and second photosensitive drums. The second process-gear train transmits the driving force from the process motor to the third and fourth photosensitive drums.
    Type: Grant
    Filed: March 11, 2021
    Date of Patent: January 18, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Hiroshi Nakano, Yusuke Ikegami, Shoichiro Nishimura
  • Patent number: 11181857
    Abstract: An image forming apparatus includes: a first developing roller movable between a first contact position and a first separated position; a second developing roller movable between a second contact position and a second separated position; and a controller. When a sheet interval is shorter than a first interval and is longer than or equal to a second interval, the controller maintains the first developing roller at the first contact position even after the completion of its development for a preceding sheet, controls the first developing roller to start development for a subsequent sheet, moves the second developing roller to the second separated position after the completion of its development for the preceding sheet, moves the second developing roller again to the second contact position, and controls the second developing roller to start development for the subsequent sheet after the second developing roller is moved again to the second contact position.
    Type: Grant
    Filed: November 11, 2020
    Date of Patent: November 23, 2021
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke Ikegami, Masahito Saeki, Toshiyuki Sano, Shintaro Sakaguchi
  • Patent number: 11163258
    Abstract: An image forming apparatus, having a casing, a cover, a photosensitive drum, a developing roller, a photo-interrupter, a moving mechanism to move the developing roller between a contacting position and a separated position, and a controller, is provided. The moving mechanism has a cam including, a first cam portion, a phase-detector wall including a first slit and a second slit, and a cam follower. When the cover moves from the open position to the closed position, the controller conducts a first initializing control to cause the cam to rotate in a reverse direction, and after detecting the first slit based on a time period, in which light in the photo-interrupter passes through one of the first slit and the second slit, cause the cam to stop rotating.
    Type: Grant
    Filed: December 4, 2020
    Date of Patent: November 2, 2021
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Toshiyuki Sano, Shintaro Sakaguchi, Yusuke Ikegami
  • Publication number: 20210325811
    Abstract: An image forming apparatus, having first, second, third, and fourth photosensitive drums, first, second, third, and fourth developing rollers, a development-driving gear, a development motor, a first development gear train having a first gear, a second development-gear train having a second gear, a process-driving gear, a process motor, a first process-gear train having a third gear, and a second process gear-train having a fourth gear, is provided. The first development-gear train transmits a driving force from the development motor to the first and second developing rollers. The second development-gear train transmits the driving force from the development motor to the third and fourth developing rollers. The first process-gear train transmits a driving force from the process motor to the first and second photosensitive drums. The second process-gear train transmits the driving force from the process motor to the third and fourth photosensitive drums.
    Type: Application
    Filed: March 11, 2021
    Publication date: October 21, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Hiroshi NAKANO, Yusuke IKEGAMI, Shoichiro NISHIMURA
  • Publication number: 20210325821
    Abstract: An image forming apparatus, having a first photosensitive drum, a second photosensitive drum, a first developing roller, a second developing roller, a first moving mechanism, a second moving mechanism, a driving gear, a motor, a first gear train, a second gear train, and a third gear train, is provided. The first gear train having a first gear transmits a driving force from the motor to the first developing roller. The second gear train having a second gear transmits the driving force from the motor to the second developing roller. The second gear train is provided separately from the first gear train. The third gear train having a third gear transmits the driving force from the motor to at least one of the first moving mechanism and the second moving mechanism. The third gear train is provided separately from the first gear train and the second gear train.
    Type: Application
    Filed: March 25, 2021
    Publication date: October 21, 2021
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Yusuke IKEGAMI, Kotaro HARUTA, Shoichiro Nishimura