Patents by Inventor Naoki Nakatake

Naoki Nakatake 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: 20200125005
    Abstract: The developer container includes a rotator that is rotated in the container body, a sequence of gears disposed outside the developer container that transmits a torque to the rotator, and a container guiding portion that fits with a main body side guiding portion and guides the developer container in a direction in which the developer container is attached to a mounting portion of an image forming device main body. A first gear included in the sequence of the gears is movable between an operating position where the first gear engages with a second gear and a retracted position where the first gear is retracted. On a surface on which the container guiding portion is disposed, a part of the container guiding portion is disposed within a projected area of the first gear being disposed at the operating position.
    Type: Application
    Filed: December 19, 2019
    Publication date: April 23, 2020
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Patent number: 10558145
    Abstract: The developer container includes a rotator that is rotated in the container body, a sequence of gears disposed outside the developer container that transmits a torque to the rotator, and a container guiding portion that fits with a main body side guiding portion and guides the developer container in a direction in which the developer container is attached to a mounting portion of an image forming device main body. A first gear included in the sequence of the gears is movable between an operating position where the first gear engages with a second gear and a retracted position where the first gear is retracted. On a surface on which the container guiding portion is disposed, a part of the container guiding portion is disposed within a projected area of the first gear being disposed at the operating position.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: February 11, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Patent number: 10496013
    Abstract: A developing device is provided which includes: a developing roller in contact with or facing an image bearer; a supply roller to supply toner to the developing roller; a casing; a first conveyer disposed within the casing and above the supply roller to supply toner stored in the developing device to the supply roller, while forming a first conveyance path; a second conveyer disposed within the casing with an upper end thereof positioned below that of the first conveyer, while forming a second conveyance path forming a toner circulation path together with the first conveyance path; a partition wall separating the first conveyance path and the second conveyance path in a longitudinal direction within a range excluding both longitudinal end portions; and a toner supply port, at a ceiling of the casing above the second conveyance path, through which toner is supplied to an inside of the developing device.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: December 3, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Minoru Toyoda, Kazuki Matsumoto, Kenji Nakamura
  • Publication number: 20190250533
    Abstract: The developer container includes a rotator that is rotated in the container body, a sequence of gears disposed outside the developer container that transmits a torque to the rotator, and a container guiding portion that fits with a main body side guiding portion and guides the developer container in a direction in which the developer container is attached to a mounting portion of an image forming device main body. A first gear included in the sequence of the gears is movable between an operating position where the first gear engages with a second gear and a retracted position where the first gear is retracted. On a surface on which the container guiding portion is disposed, a part of the container guiding portion is disposed within a projected area of the first gear being disposed at the operating position.
    Type: Application
    Filed: April 23, 2019
    Publication date: August 15, 2019
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Patent number: 10295933
    Abstract: A removable device is to be detachably attached to an apparatus main body. The removable device includes a conveying drive gear attached to a first rotational shaft, an agitating drive gear attached to a second rotational shaft, and a torque transmission gear attached to a third rotational shaft. When an addendum circle diameter of the conveying drive gear is A, and an addendum circle diameter of the agitating drive gear is B, B>A is satisfied. The torque transmission gear moves around the conveying drive gear to access the agitating drive gear.
    Type: Grant
    Filed: November 26, 2018
    Date of Patent: May 21, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Publication number: 20190094758
    Abstract: A removable device is to be detachably attached to an apparatus main body. The removable device includes a conveying drive gear attached to a first rotational shaft, an agitating drive gear attached to a second rotational shaft, and a torque transmission gear attached to a third rotational shaft. When an addendum circle diameter of the conveying drive gear is A, and an addendum circle diameter of the agitating drive gear is B, B>A is satisfied. The torque transmission gear moves around the conveying drive gear to access the agitating drive gear.
    Type: Application
    Filed: November 26, 2018
    Publication date: March 28, 2019
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Patent number: 10175607
    Abstract: A removable developer container includes a convex portion to be inserted into a groove of an apparatus main body, a rotator to rotate around a rotational shaft, and a recess convex portion to be inserted into a groove of an apparatus main body, at a rear side of the convex portion. One end of the rotational shaft is inserted into the recess.
    Type: Grant
    Filed: May 17, 2017
    Date of Patent: January 8, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Publication number: 20180364620
    Abstract: A developing device is provided which includes: a developing roller in contact with or facing an image hearer; a supply roller to supply toner to the developing roller; a casing; a first conveyer disposed within the casing and above the supply roller to supply toner stored in the developing device to the supply roller, while forming a first conveyance path; a second conveyer disposed within the casing with an upper end thereof positioned below that of the first conveyer, while forming a second conveyance path forming a toner circulation path together with the first conveyance path; a partition wall separating the first conveyance path and the second conveyance path in a longitudinal direction within a range excluding both longitudinal end portions; and a toner supply port, at a ceiling of the casing above the second conveyance path, through which toner is supplied to an inside of the developing device.
    Type: Application
    Filed: May 1, 2018
    Publication date: December 20, 2018
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Minoru Toyoda, Kazuki Matsumoto, Kenji Nakamura
  • Patent number: 9811023
    Abstract: A developing device includes: a toner detection unit that detects whether there is toner that is stored; a stirring unit that stirs toner in a toner container; a calculation unit that calculates an output duty by comparing an output voltage of the toner detection unit representing whether there is toner after the stirring, with a predetermined voltage value; and a remaining amount detection unit that detects an amount of remaining toner at the output duty from a correspondence relationship between the output duty and an amount of remaining toner that is previously set.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: November 7, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Akinori Yamaguchi, Naoki Nakatake
  • Patent number: 9772601
    Abstract: A process unit includes a rotatable image bearer, an optical writing head to expose the image bearer within an maximum exposure range in an axial direction of the image bearer, a developer bearer, spacers disposed in axial end portions of the image bearer to determine a position of the optical writing head relative to the image bearer and slidingly contact the image bearer, a cleaner disposed downstream from the developer bearer in an image bearer rotation direction, and a remover to slidingly contact the axial end portion of the image bearer to remove a substance adhering thereto. In the axial direction, inner ends of the spacers are positioned inside a toner layer range of the developer bearer extending beyond a largest sheet width. The remover is disposed downstream from the cleaner and crossing a line extending from the inner end of the spacer perpendicularly to the axial direction.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: September 26, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsutoshi Kichise, Takeshi Yamashita, Kazuki Matsumoto, Emi Kita, Naoki Nakatake, Takeshi Sakashita, Takuya Akiyama
  • Publication number: 20170248870
    Abstract: The developer container includes a rotator that is rotated in the container body, a sequence of gears disposed outside the developer container that transmits a torque to the rotator, and a container guiding portion that fits with a main body side guiding portion and guides the developer container in a direction in which the developer container is attached to a mounting portion of an image forming device main body. A first gear included in the sequence of the gears is movable between an operating position where the first gear engages with a second gear and a retracted position where the first gear is retracted. On a surface on which the container guiding portion is disposed, a part of the container guiding portion is disposed within a projected area of the first gear being disposed at the operating position.
    Type: Application
    Filed: May 17, 2017
    Publication date: August 31, 2017
    Inventors: Tomohiro KUBOTA, Naoki NAKATAKE, Yoshiyuki SHIMIZU, Shoh TSURITANI, Manabu HAMADA, Masato TSUJI, Masanari FUJITA
  • Publication number: 20170248896
    Abstract: Image forming apparatus, including: image bearer; charging unit for electrically charging image bearer surface; developing unit for developing with toner, electrostatic latent image formed over image bearer by exposure unit for performing light exposure; transfer unit for transferring developed toner to receiving member; and cleaning unit for cleaning toner remaining over image bearer without being transferred, wherein the toner contains: external additives; and base particles made of at least binder resin and colorant, external additive content of the toner is from 4 to 7 parts by mass relative to 100 parts by mass of base particles, primary particles of at least one external additive have a number average particle diameter of 0.01 to 0.05 ?m, cleaning unit includes an elastic-body blade having surface elastic modulus of from 15 to 25 N/mm2 and surface friction coefficient of from 0.5 to 0.7 at an abutment part thereof abutting on image bearer.
    Type: Application
    Filed: July 17, 2015
    Publication date: August 31, 2017
    Inventors: Naoki NAKATAKE, Takeshi YAMASHITA, Tetsushi SAKUMA, Mitsutoshi KICHISE, Tsuyoshi NOZAKI, Yoshihiro MIKURIYA, Yoshimichi ISHIKAWA, Atsushi YAMAMOTO, Kazuoki FUWA, Tomohiro FUKAO, Tomoharu MIKI
  • Patent number: 9733607
    Abstract: A cleaning device in accordance with the present disclosure includes a cleaning member to clean toner on an image bearer, a toner conveyor that rotates to convey toner cleaned by the cleaning member, and an agitator that includes a bent portion that is in contact with the toner conveyor, and the agitator vibrates due to the rotation of the toner conveyor. The agitator includes a plurality of arm members, and a first end of a first arm member of the plurality of arm members is attached to a second end of a second arm member of the plurality of arm members.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: August 15, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazuki Matsumoto, Naoki Nakatake, Emi Kita, Mitsutoshi Kichise
  • Patent number: 9696657
    Abstract: A removable device to be detachably attached to an apparatus main body includes a container body to store developer; a discharge opening to discharge the developer inside the container body; an internal shutter to open and close the discharge opening; an external shutter to open and close the discharge opening, the external shutter being disposed at an outer side with respect to the internal shutter, wherein the internal shutter and the external shutter are configured to be driven separately.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: July 4, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Publication number: 20170031310
    Abstract: A process unit includes a rotatable image bearer, an optical writing head to expose the image bearer within an maximum exposure range in an axial direction of the image bearer, a developer bearer, spacers disposed in axial end portions of the image bearer to determine a position of the optical writing head relative to the image bearer and slidingly contact the image bearer, a cleaner disposed downstream from the developer bearer in an image bearer rotation direction, and a remover to slidingly contact the axial end portion of the image bearer to remove a substance adhering thereto. In the axial direction, inner ends of the spacers are positioned inside a toner layer range of the developer bearer extending beyond a largest sheet width. The remover is disposed downstream from the cleaner and crossing a line extending from the inner end of the spacer perpendicularly to the axial direction.
    Type: Application
    Filed: July 29, 2016
    Publication date: February 2, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Mitsutoshi KICHISE, Takeshi YAMASHITA, Kazuki MATSUMOTO, Emi KITA, Naoki NAKATAKE, Takeshi SAKASHITA, Takuya AKIYAMA
  • Publication number: 20160342129
    Abstract: A cleaning device in accordance with the present disclosure includes a cleaning member to clean toner on an image bearer, a toner conveyor that rotates to convey toner cleaned by the cleaning member, and an agitator that includes a bent portion that is in contact with the toner conveyor, and the agitator vibrates due to the rotation of the toner conveyor. The agitator includes a plurality of arm members, and a first end of a first arm member of the plurality of arm members is attached to a second end of a second arm member of the plurality of arm members.
    Type: Application
    Filed: May 18, 2016
    Publication date: November 24, 2016
    Inventors: Kazuki MATSUMOTO, Naoki NAKATAKE, Emi KITA, Mitsutoshi KICHISE
  • Patent number: 9360824
    Abstract: An image forming apparatus is provided which includes an image bearer, a charger, an irradiator, a developing device to develop an electrostatic latent image on the image bearer with a toner to form a toner image, a transfer device to transfer the toner image onto a transfer medium, and a cleaner to remove toner particles remaining on the image bearer without being transferred. The toner includes a mother particle including a binder resin and a colorant and one or more external additives. At least one of the external additives includes primary particles having a number average particle diameter in the range of 0.05 to 0.30 ?m. The cleaner includes an elastic body blade having a contact part with the image bearer. The contact part has a surface elastic modulus in the range of 15 to 25 N/mm2 and a surface friction coefficient in the range of 0.5 to 0.7.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: June 7, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiro Fukao, Tsuyoshi Nozaki, Yoshihiro Mikuriya, Yoshimichi Ishikawa, Atsushi Yamamoto, Kazuoki Fuwa, Tomoharu Miki, Naoki Nakatake, Takeshi Yamashita, Tetsushi Sakuma
  • Publication number: 20160139540
    Abstract: The developer container includes a rotator that is rotated in the container body, a sequence of gears disposed outside the developer container that transmits a torque to the rotator, and a container guiding portion that fits with a main body side guiding portion and guides the developer container in a direction in which the developer container is attached to a mounting portion of an image forming device main body. A first gear included in the sequence of the gears is movable between an operating position where the first gear engages with a second gear and a retracted position where the first gear is retracted. On a surface on which the container guiding portion is disposed, a part of the container guiding portion is disposed within a projected area of the first gear being disposed at the operating position.
    Type: Application
    Filed: January 27, 2016
    Publication date: May 19, 2016
    Inventors: Tomohiro KUBOTA, Naoki NAKATAKE, Yoshiyuki SHIMIZU, Shoh TSURITANI, Manabu HAMADA, Masato TSUJI, Masanari FUJITA
  • Patent number: 9280130
    Abstract: The developer container includes a rotator that is rotated in the container body, a sequence of gears disposed outside the developer container that transmits a torque to the rotator, and a container guiding portion that fits with a main body side guiding portion and guides the developer container in a direction in which the developer container is attached to a mounting portion of an image forming device main body. A first gear included in the sequence of the gears is movable between an operating position where the first gear engages with a second gear and a retracted position where the first gear is retracted. On a surface on which the container guiding portion is disposed, a part of the container guiding portion is disposed within a projected area of the first gear being disposed at the operating position.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: March 8, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiro Kubota, Naoki Nakatake, Yoshiyuki Shimizu, Shoh Tsuritani, Manabu Hamada, Masato Tsuji, Masanari Fujita
  • Publication number: 20160033924
    Abstract: An image forming apparatus is provided which includes an image bearer, a charger, an irradiator, a developing device to develop an electrostatic latent image on the image bearer with a toner to form a toner image, a transfer device to transfer the toner image onto a transfer medium, and a cleaner to remove toner particles remaining on the image bearer without being transferred. The toner includes a mother particle including a binder resin and a colorant and one or more external additives. At least one of the external additives includes primary particles having a number average particle diameter in the range of 0.05 to 0.30 ?m. The cleaner includes an elastic body blade having a contact part with the image bearer. The contact part has a surface elastic modulus in the range of 15 to 25 N/mm2 and a surface friction coefficient in the range of 0.5 to 0.7.
    Type: Application
    Filed: July 6, 2015
    Publication date: February 4, 2016
    Inventors: Tomohiro FUKAO, Tsuyoshi NOZAKI, Yoshihiro MIKURIYA, Yoshimichi ISHIKAWA, Atsushi YAMAMOTO, Kazuoki FUWA, Tomoharu MIKI, Naoki NAKATAKE, Takeshi YAMASHITA, Tetsushi SAKUMA