Patents by Inventor Yusuke ISHIZUKA

Yusuke ISHIZUKA 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: 10935907
    Abstract: A developer conveyance device includes a downward conveyance path in which a developer falls under gravity, a transverse conveyance path communicating with a lower end of the downward conveyance path and extending in a transverse direction intersecting with the downward conveyance path, a transport screw disposed in the transverse conveyance path, and a floating member. The transport screw is configured to rotate in a predetermined direction to transport the developer in the transverse direction. The floating member is configured to contact the transport screw rotating in the predetermined direction to float in the downward conveyance path.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: March 2, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yusuke Ishizuka, Akira Fujimori, Hideki Kimura, Yutaka Takahashi, Hiroshi Kikuchi, Hiroyuki Uenishi, Johji Yahagi
  • Publication number: 20210033998
    Abstract: A developing device includes a developer bearer, a developer regulator, a developer supply passage, and a stopper. The developer bearer includes a magnetic field generator and is configured to bear a developer containing toner and magnetic carriers and conveys the developer to a developing area by rotation. A stopper is configured to prevent the developer blocked by the developer regulator from moving to a surface of the developer bearer, while securing a supply path for passing the developer in the developer supply passage to the developer bearer between the stopper and an upper end of a side wall of the developer supply passage that is opposite to the developing bearer. A width of the supply path in a direction perpendicular to a direction of a rotation axis of the developer bearer is in a range of 7% or more and less than 10% of a circumference of an outer diameter of the developing bearer.
    Type: Application
    Filed: July 8, 2020
    Publication date: February 4, 2021
    Inventors: Hiroshi KIKUCHI, Akira FUJIMORI, Hideki KIMURA, Yutaka TAKAHASHI, Johji YAHAGI, Hiroyuki UENISHI, Yusuke ISHIZUKA
  • Publication number: 20200387085
    Abstract: A developer conveyance device includes a downward conveyance path in which a developer falls under gravity, a transverse conveyance path communicating with a lower end of the downward conveyance path and extending in a transverse direction intersecting with the downward conveyance path, a transport screw disposed in the transverse conveyance path, and a floating member. The transport screw is configured to rotate in a predetermined direction to transport the developer in the transverse direction. The floating member is configured to contact the transport screw rotating in the predetermined direction to float in the downward conveyance path.
    Type: Application
    Filed: May 18, 2020
    Publication date: December 10, 2020
    Inventors: Yusuke ISHIZUKA, Akira FUJIMORI, Hideki KIMURA, Yutaka TAKAHASHI, Hiroshi KIKUCHI, Hiroyuki UENISHI, Johji YAHAGI
  • Publication number: 20200233365
    Abstract: A cleaning device includes a brush roller configured to contact an image bearer while rotating to remove toner adhering to an image bearer, a bias applying device configured to apply a bias to the brush roller, and control circuitry configured to causes the bias applying device to apply a first bias in a first period from when the brush roller is new to when a cumulative travel distance or a cumulative rotation time of the brush roller reaches a predetermined value, and to apply a second bias in a second period after the first period. The first bias sends a first current through the brush roller, and the second bias sends a second current through the brush roller. The absolute value of the first current is smaller than the absolute value of the second current.
    Type: Application
    Filed: January 6, 2020
    Publication date: July 23, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Hideki Kimura, Akira Fujimori, Hiroshi Kikuchi, Yutaka Takahashi, Hiroyuki Uenishi, Yusuke Ishizuka, Johji Yahagi
  • Publication number: 20190211290
    Abstract: A method for producing a fermented beverage, characterized in that the method includes adding a hop processed product to a raw material liquid from the tightly closed vessel, the hop processed product being prepared by treating a hop-containing water under conditions of a temperature of 100° C. or higher and 130° C. or lower, and preferably 105° C. or higher and 125° C. or lower, and a pressure of 0.01 MPa or more and 0.36 MPa or less in a tightly closed vessel; and adding an yeast to allow fermentation. According to the present invention, the bitterness ingredients and the aroma ingredients can be more conveniently extracted from the hops, so that a new taste can be provided as a luxury product.
    Type: Application
    Filed: August 10, 2016
    Publication date: July 11, 2019
    Applicant: Suntory Holdings Limited
    Inventors: Takako Inui, Yusuke Ishizuka, Chie Hayashi
  • Patent number: 9983512
    Abstract: A toner conveyance device includes a downward passage, a reciprocating member disposed in the downward passage, to move in a vertical direction in which the downward passage extends, a conveyance passage communicating with a lower end of the downward passage and extending in a direction crossing the vertical direction, a conveyor to rotate in the conveyance passage around an axis extending along the conveyance passage to transport the toner, and a flexible member projecting from a bottom of the reciprocating member toward the conveyance passage. The flexible member extends in the axial direction of the conveyor and moves together with the reciprocating member. When the reciprocating member is at a lowest position, a lower end of the flexible member opposes a portion of the conveyor downstream from an upper end thereof in a rotation direction thereof.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: May 29, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yusuke Ishizuka, Takeshi Shintani, Yasuhiro Maehata, Hiroshi Mizusawa, Daisuke Tomita, Yuta Azeyanagi, Yasuhito Kuboshima
  • Patent number: 9958823
    Abstract: A device disposed opposing an image bearer includes a roller to rotate while contacting a surface of the image bearer, a rolling bearing fitted around a shaft located at an end of the roller in an axial direction of the roller, a frame to house the roller, and a bearing support removably attached to the frame. The rolling bearing includes an outer ring, an inner ring, and a rolling element disposed between the outer ring and the inner ring. The bearing support holds, from an outer-ring side, the rolling bearing interposed between the bearing support and the frame. The bearing support includes a receiving portion to contact the outer ring of the rolling bearing and bias the rolling bearing toward the frame in a direction in which the rolling bearing is interposed between the bearing support and the frame.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: May 1, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Daisuke Tomita, Takeshi Shintani, Yasuhiro Maehata, Yasuhito Kuboshima, Yusuke Ishizuka, Nobuo Kuwabara, Norio Kudoh, Kento Aoki
  • Patent number: 9798288
    Abstract: An image forming apparatus includes an image bearer to bear a toner image, a lubricant supply roller to supply lubricant to a surface of the image bearer, a rotation speed changer to change a rotation speed of the lubricant supply roller, and a controller to control the rotation speed changer to change the rotation speed of the lubricant supply roller to a target speed based on a predetermined condition. The controller is configured to control the rotation speed changer to avoid a predetermined speed range.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: October 24, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiro Maehata, Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Daisuke Tomita, Yasuhito Kuboshima, Yusuke Ishizuka
  • Publication number: 20170275577
    Abstract: A method for producing a saccharified mash comprising drawing out a part of a mash to be saccharified into a tank, heating the part, and returning the part and mixing with the remainder part, characterized in that the method comprises heating the drawn-out mash to be saccharified in a copper tube. A beer using a saccharified mash obtained by the production method of the present invention allows to control the generation of factors that would be regarded as negative in sensory aspect such as “burnt taste,” and shows overall excellent flavor such as being excellent in body, aroma and taste, so that a new taste can be provided as a luxurious product.
    Type: Application
    Filed: August 31, 2015
    Publication date: September 28, 2017
    Applicant: Suntory Holdings Limited
    Inventors: Yoshinori Hida, Taichi Maruhashi, Yusuke Ishizuka
  • Publication number: 20170261887
    Abstract: A toner conveyance device includes a downward passage, a reciprocating member disposed in the downward passage, to move in a vertical direction in which the downward passage extends, a conveyance passage communicating with a lower end of the downward passage and extending in a direction crossing the vertical direction, a conveyor to rotate in the conveyance passage around an axis extending along the conveyance passage to transport the toner, and a flexible member projecting from a bottom of the reciprocating member toward the conveyance passage. The flexible member extends in the axial direction of the conveyor and moves together with the reciprocating member. When the reciprocating member is at a lowest position, a lower end of the flexible member opposes a portion of the conveyor downstream from an upper end thereof in a rotation direction thereof.
    Type: Application
    Filed: February 10, 2017
    Publication date: September 14, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Yusuke ISHIZUKA, Takeshi Shintani, Yasuhiro Maehata, Hiroshi Mizusawa, Daisuke Tomita, Yuta Azeyanagi, Yasuhito Kuboshima
  • Patent number: 9696648
    Abstract: An image forming apparatus includes a process cartridge that includes an image bearer including a rotary shaft and rotates about the rotary shaft; a charger to charge a surface of the image bearer; and a developing device to develop an electrostatic latent image formed on the image bearer into a visible toner image. The charger includes a charging roller that rotates about a shaft together with the image bearer during image formation and electrically charges a surface of the image bearer. A surface linear speed of the charging roller is made slower than a surface linear speed of the image bearer. The image forming apparatus includes a charging roller controller that switches the rotational speed of the charging roller to a first rotational speed slower than the linear speed of the image bearer and a second rotational speed identical to the linear speed of the image bearer.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: July 4, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiro Maehata, Nobuo Kuwabara, Kenji Honjoh, Yasuhito Kuboshima, Yusuke Ishizuka, Takeshi Shintani
  • Publication number: 20170102663
    Abstract: A device disposed opposing an image bearer includes a roller to rotate while contacting a surface of the image bearer, a rolling bearing fitted around a shaft located at an end of the roller in an axial direction of the roller, a frame to house the roller, and a bearing support removably attached to the frame. The rolling bearing includes an outer ring, an inner ring, and a rolling element disposed between the outer ring and the inner ring. The bearing support holds, from an outer-ring side, the rolling bearing interposed between the bearing support and the frame. The bearing support includes a receiving portion to contact the outer ring of the rolling bearing and bias the rolling bearing toward the frame in a direction in which the rolling bearing is interposed between the bearing support and the frame.
    Type: Application
    Filed: October 5, 2016
    Publication date: April 13, 2017
    Inventors: Daisuke TOMITA, Takeshi SHINTANI, Yasuhiro MAEHATA, Yasuhito KUBOSHIMA, Yusuke ISHIZUKA, Nobuo KUWABARA, Norio KUDOH, Kento AOKI
  • Publication number: 20160334757
    Abstract: An image forming apparatus includes an image bearer to bear a toner image, a lubricant supply roller to supply lubricant to a surface of the image bearer, a rotation speed changer to change a rotation speed of the lubricant supply roller, and a controller to control the rotation speed changer to change the rotation speed of the lubricant supply roller to a target speed based on a predetermined condition. The controller is configured to control the rotation speed changer to avoid a predetermined speed range.
    Type: Application
    Filed: May 3, 2016
    Publication date: November 17, 2016
    Inventors: Yasuhiro MAEHATA, Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Daisuke Tomita, Yasuhito Kuboshima, Yusuke Ishizuka
  • Publication number: 20160209771
    Abstract: An image forming apparatus includes a process cartridge that includes an image bearer including a rotary shaft and rotates about the rotary shaft; a charger to charge a surface of the image bearer; and a developing device to develop an electrostatic latent image formed on the image bearer into a visible toner image. The charger includes a charging roller that rotates about a shaft together with the image bearer during image formation and electrically charges a surface of the image bearer. A surface linear speed of the charging roller is made slower than a surface linear speed of the image bearer. The image forming apparatus includes a charging roller controller that switches the rotational speed of the charging roller to a first rotational speed slower than the linear speed of the image bearer and a second rotational speed identical to the linear speed of the image bearer.
    Type: Application
    Filed: January 15, 2016
    Publication date: July 21, 2016
    Applicant: Ricoh Company, Ltd.
    Inventors: Yasuhiro Maehata, Nobuo Kuwabara, Kenji Honjoh, Yasuhito Kuboshima, Yusuke Ishizuka, Takeshi Shintani
  • Patent number: 9395686
    Abstract: A process cartridge removably installable in an image forming apparatus includes a cartridge body including an image bearer; a cleaning unit removably attached to the cartridge body and including a lubricant supply device to lubricate the image bearer; a first contact terminal disposed in one of the cleaning unit and the cartridge body; and a second contact terminal disposed in the other of the cleaning unit and the cartridge body. The second contact terminal is disposed to contact the first contact terminal to establish electrical continuity between the cartridge body and the cleaning unit, and an end of the first contact terminal includes a sliding contact portion to slidingly contact the second contact terminal in attachment and removal of the cleaning unit to and from the cartridge body.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: July 19, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeshi Shintani, Yasuhito Kuboshima, Yusuke Ishizuka, Kenji Honjoh, Nobuhiro Kuwabara
  • Patent number: 9383715
    Abstract: A lubricant supplying device includes a lubricant supplier contacting an image bearer, a solid lubricant contacting the roller, a detector detecting a lubricant amount, and a controller controlling a supplying of the roller based on a detector detection. The detector outputs to the controller a first signal of a near-end state when the amount reaches a first amount, a second signal of an end state when the amount reaches a second amount smaller than the first amount, and a third signal of an absolute end state when the amount reaches a third amount smaller than the second amount. The controller temporarily stops the supplying when the second signal is output, cancels a roller temporary stopped state even when lubricant replacement is not completed after this state, stops the supplying when the third signal is output, and maintains a roller stopped state until the replacement is completed after this state.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: July 5, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Yasuhiro Maehata, Yasuhito Kuboshima, Yusuke Ishizuka
  • Patent number: 9367021
    Abstract: An image forming apparatus includes a controller and multiple image forming units each of which includes an image bearer, a toner image forming device to form a toner image on the image bearer, a transfer device to transfer the toner image from the image bearer onto a transfer medium, a cleaning device to remove toner from a surface of the image bearer, a waste-toner tube through which toner removed by the cleaning device is transported, and a toner conveying member to transport toner by rotation and disposed inside the waste-toner tube. The controller changes a rotation speed of the toner conveying member for each of the multiple image forming units according to toner type including a first toner and a second toner having poorer flow properties than the first toner, and at least one image forming units uses the second toner and the rest use the first toner.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: June 14, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Yusuke Ishizuka, Takeshi Shintani, Nobuo Kuwabara, Kenji Honjoh, Yasuhito Kuboshima
  • Publication number: 20160139555
    Abstract: A lubricant supplying device includes a lubricant supplier contacting an image bearer, a solid lubricant contacting the roller, a detector detecting a lubricant amount, and a controller controlling a supplying of the roller based on a detector detection. The detector outputs to the controller a first signal of a near-end state when the amount reaches a first amount, a second signal of an end state when the amount reaches a second amount smaller than the first amount, and a third signal of an absolute end state when the amount reaches a third amount smaller than the second amount. The controller temporarily stops the supplying when the second signal is output, cancels a roller temporary stopped state even when lubricant replacement is not completed after this state, stops the supplying when the third signal is output, and maintains a roller stopped state until the replacement is completed after this state.
    Type: Application
    Filed: November 6, 2015
    Publication date: May 19, 2016
    Inventors: Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Yasuhiro Maehata, Yasuhito Kuboshima, Yusuke Ishizuka
  • Patent number: 9268292
    Abstract: An image forming apparatus includes a first image forming device, a plurality of second image forming devices, a first bias voltage supply device, and a second bias voltage supply device. The first image forming device and the second image forming device form a toner image. The first bias voltage supply device applies a bias voltage to a first component of the first image forming device. The second bias voltage supply device applies a bias voltage to a second component of each of the plurality of second image forming devices.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: February 23, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeshi Kojima, Hirotaka Hatta, Toshiya Satoh, Akira Asaoka, Hiroyuki Uenishi, Yusuke Ishizuka
  • Publication number: 20160011562
    Abstract: A process cartridge removably installable in an image forming apparatus includes a cartridge body including an image bearer; a cleaning unit removably attached to the cartridge body and including a lubricant supply device to lubricate the image bearer; a first contact terminal disposed in one of the cleaning unit and the cartridge body; and a second contact terminal disposed in the other of the cleaning unit and the cartridge body. The second contact terminal is disposed to contact the first contact terminal to establish electrical continuity between the cartridge body and the cleaning unit, and an end of the first contact terminal includes a sliding contact portion to slidingly contact the second contact terminal in attachment and removal of the cleaning unit to and from the cartridge body.
    Type: Application
    Filed: June 29, 2015
    Publication date: January 14, 2016
    Applicant: Ricoh Company, Ltd.
    Inventors: Takeshi SHINTANI, Yasuhito KUBOSHIMA, Yusuke ISHIZUKA, Kenji HONJOH, Nobuhiro KUWABARA