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: 9201378
    Abstract: A cleaning unit, which is included in a process cartridge or an image forming apparatus, includes a brush rotary body to remove toner, a toner collecting rotary body to collect the toner, a toner collecting blade to scrape the toner, and a cleaning blade to scrape the toner falling from the brush rotary body. The image carrier, the brush rotary body, and the toner collecting rotary body rotate in the same direction. The cleaning blade, the brush rotary body, and the toner collecting rotary body are located to cause a tangential line passing through a contact area of the brush rotary body and the toner collecting rotary body on an outer peripheral circle around a shaft of the brush rotary body to have an intersection point intersecting a non-contact surface of the cleaning blade disposed opposite to a contact portion of the cleaning blade with the image carrier.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: December 1, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Akira Asaoka, Hirotaka Hatta, Toshiya Sato, Takeshi Kojima, Hiroyuki Uenishi, Yusuke Ishizuka
  • Patent number: 9195204
    Abstract: An image forming apparatus includes an image carrier, a toner-image forming unit, a transfer unit, a cleaner, a plurality of cylindrical transport path forming members, a falling transport path forming member, and a discharge port. The falling transport path forming member has through holes in a side wall thereof. A second end of each of the transport path forming members is inserted into a corresponding one of the through holes. The falling transport path forming member forms a falling transport path that causes toner ejected from an ejection port disposed in the second end to fall. The discharge port is disposed in a lower part of the falling transport path forming member to discharge the toner to a discharge destination. The second ends of the transport path forming members are disposed offset from each other in a horizontal direction on the side wall of the falling transport path forming member.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: November 24, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yusuke Ishizuka, Hirotaka Hatta, Toshiya Sato, Akira Asaoka, Norio Kudo, Hiroyuki Uenishi, Kenji Sugiura, Kazuki Yogosawa
  • Patent number: 9158267
    Abstract: An image forming apparatus including multiple image forming units; a waste-toner container; and a waste-toner conveyance device including a common conveyance channel member disposed in an arrangement direction of the image forming units and provided with toner inlets to receive the waste toner from toner outlets of the cleaning units, communicating channel members identical in structure and respectively disposed between the toner outlets and the toner inlets of the common conveyance channel member, and a rotatable conveying member to transport the waste toner inside the common conveyance channel member linearly along a rotation axis thereof. The common conveyance channel member is shaped to equalize relative positions of each of the toner outlets and a corresponding one of the toner inlets of the common conveyance channel member among the multiple image forming units among which a distance from the toner outlet to the rotation axis differs.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: October 13, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Nobuo Kuwabara, Shinichi Kawahara, Norio Kudoh, Takeshi Shintani, Kenji Honjoh, Yasuhito Kuboshima, Yusuke Ishizuka
  • Patent number: 9141020
    Abstract: A charger positioning adjuster, which is included in an image forming apparatus and disposed facing a charger uniformly charging a surface of an image carrier using corona discharging, includes a mounting part provided at a position on which the charger is detachably attached, a positioning member attached to the mounting part and positioning the charger by contacting thereto, and a spacer disposed between the mounting part and the positioning member and adjusting a distance between the surface of the image carrier and the charger.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: September 22, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyuki Uenishi, Hirotaka Hatta, Toshiya Sato, Takeshi Kojima, Akira Asaoka, Yusuke Ishizuka
  • Publication number: 20150227107
    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: Application
    Filed: January 26, 2015
    Publication date: August 13, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yusuke ISHIZUKA, Takeshi SHINTANI, Nobuo KUWABARA, Kenji HONJOH, Yasuhito KUBOSHIMA
  • Publication number: 20150078795
    Abstract: An image forming apparatus including multiple image forming units; a waste-toner container; and a waste-toner conveyance device including a common conveyance channel member disposed in an arrangement direction of the image forming units and provided with toner inlets to receive the waste toner from toner outlets of the cleaning units, communicating channel members identical in structure and respectively disposed between the toner outlets and the toner inlets of the common conveyance channel member, and a rotatable conveying member to transport the waste toner inside the common conveyance channel member linearly along a rotation axis thereof. The common conveyance channel member is shaped to equalize relative positions of each of the toner outlets and a corresponding one of the toner inlets of the common conveyance channel member among the multiple image forming units among which a distance from the toner outlet to the rotation axis differs.
    Type: Application
    Filed: September 3, 2014
    Publication date: March 19, 2015
    Inventors: Nobuo KUWABARA, Shinichi KAWAHARA, Norio KUDOH, Takeshi SHINTANI, Kenji HONJOH, Yasuhito KUBOSHIMA, Yusuke ISHIZUKA
  • Publication number: 20140314461
    Abstract: An image forming apparatus includes an image carrier, a toner-image forming unit, a transfer unit, a cleaner, a plurality of cylindrical transport path forming members, a falling transport path forming member, and a discharge port. The falling transport path forming member has through holes in a side wall thereof. A second end of each of the transport path forming members is inserted into a corresponding one of the through holes. The falling transport path forming member forms a falling transport path that causes toner ejected from an ejection port disposed in the second end to fall. The discharge port is disposed in a lower part of the falling transport path forming member to discharge the toner to a discharge destination. The second ends of the transport path forming members are disposed offset from each other in a horizontal direction on the side wall of the falling transport path forming member.
    Type: Application
    Filed: April 16, 2014
    Publication date: October 23, 2014
    Inventors: Yusuke ISHIZUKA, Hirotaka Hatta, Toshiya Sato, Akira Asaoka, Norio Kudo, Hiroyuki UENISHI, Kenji Sugiura, Kazuki Yogosawa
  • Publication number: 20140270847
    Abstract: A charger positioning adjuster, which is included in an image forming apparatus and disposed facing a charger uniformly charging a surface of an image carrier using corona discharging, includes a mounting part provided at a position on which the charger is detachably attached, a positioning member attached to the mounting part and positioning the charger by contacting thereto, and a spacer disposed between the mounting part and the positioning member and adjusting a distance between the surface of the image carrier and the charger.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hiroyuki UENISHI, Hirotaka HATTA, Toshiya SATO, Takeshi KOJIMA, Akira ASAOKA, Yusuke ISHIZUKA
  • Publication number: 20140233997
    Abstract: A cleaning unit, which is included in a process cartridge or an image forming apparatus, includes a brush rotary body to remove toner, a toner collecting rotary body to collect the toner, a toner collecting blade to scrape the toner, and a cleaning blade to scrape the toner falling from the brush rotary body. The image carrier, the brush rotary body, and the toner collecting rotary body rotate in the same direction. The cleaning blade, the brush rotary body, and the toner collecting rotary body are located to cause a tangential line passing through a contact area of the brush rotary body and the toner collecting rotary body on an outer peripheral circle around a shaft of the brush rotary body to have an intersection point intersecting a non-contact surface of the cleaning blade disposed opposite to a contact portion of the cleaning blade with the image carrier.
    Type: Application
    Filed: January 30, 2014
    Publication date: August 21, 2014
    Inventors: Akira ASAOKA, Hirotaka HATTA, Toshiya SATO, Takeshi KOJIMA, Hiroyuki UENISHI, Yusuke ISHIZUKA
  • Publication number: 20140126942
    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: Application
    Filed: September 13, 2013
    Publication date: May 8, 2014
    Inventors: Takeshi KOJIMA, Hirotaka HATTA, Toshiya SATOH, Akira ASAOKA, Hiroyuki UENISHI, Yusuke ISHIZUKA