Patents by Inventor Yoshikuni Sasaki

Yoshikuni Sasaki 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: 10401766
    Abstract: An image forming apparatus includes a fixing rotator rotatable in a predetermined direction of rotation, over which a recording medium is conveyed, and a heater to heat the fixing rotator. A temperature detector detects a temperature of the fixing rotator. A controller performs a primary productivity control to define a primary productivity rate of printing per unit time based on the temperature of the fixing rotator that is detected by the temperature detector. The controller calculates an amount of power suppliable to the heater and performs a secondary productivity control simultaneously with and separately from the primary productivity control. The secondary productivity control defines a secondary productivity rate of printing per unit time based on the amount of power suppliable to the heater. The controller selects one of the primary productivity rate and the secondary productivity rate whichever is lower as a productivity rate of the image forming apparatus.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: September 3, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryohhei Sugiyama, Hiroshi Ono, Hironori Yamaoka, Motoyoshi Yamano, Yoshikuni Sasaki, Tetsuo Tokuda
  • Patent number: 9817345
    Abstract: A fixing device includes a heater, a fixing rotator, a pressure rotator to press against the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator, through which a recording medium is conveyed, a moving device to move the pressure rotator in directions in which the pressure rotator comes into contact with and separates from the fixing rotator, a thermal expansion amount predictor to predict an amount of thermal expansion of the fixing rotator while the recording medium is conveyed, and a nip width adjuster to control a moving distance of the pressure rotator moved by the moving device toward the fixing rotator, depending on the amount of thermal expansion of the fixing rotator predicted by the thermal expansion amount predictor, so as to adjust a width of the fixing nip to maintain a substantially constant width of the fixing nip.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: November 14, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Motoyoshi Yamano, Tetsuo Tokuda, Yoshikuni Sasaki, Hiroshi Ono, Hironori Yamaoka, Ryohhei Sugiyama, Kohichi Utsunomiya, Arinobu Yoshiura, Hideo Nagafuji
  • Patent number: 9696672
    Abstract: A drive transmission unit transmits driving force to a driven unit including a driven rotator coupled to the drive transmission unit via a unit coupler. The drive transmission unit includes a driving source, a drive transmission member to transmit driving force from the driving source to the driven rotator by engaging the driven rotator, and a basal plate with a turning shaft portion at one end thereof. The basal plate supports the driving source and the drive transmission member thereon. The drive transmission unit is turned around the turning shaft portion together with the driven unit in a direction substantially orthogonal to a direction of a driving reaction force applied to the drive transmission member when the driven rotator receives the driving force from the drive transmission member.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: July 4, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroshi Ono, Tetsuo Tokuda, Yoshikuni Sasaki, Hironori Yamaoka, Ryohhei Sugiyama, Yamano Motoyoshi
  • Publication number: 20170146933
    Abstract: A fixing device includes a heater, a fixing rotator, a pressure rotator to press against the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator, through which a recording medium is conveyed, a moving device to move the pressure rotator in directions in which the pressure rotator comes into contact with and separates from the fixing rotator, a thermal expansion amount predictor to predict an amount of thermal expansion of the fixing rotator while the recording medium is conveyed, and a nip width adjuster to control a moving distance of the pressure rotator moved by the moving device toward the fixing rotator, depending on the amount of thermal expansion of the fixing rotator predicted by the thermal expansion amount predictor, so as to adjust a width of the fixing nip to maintain a substantially constant width of the fixing nip.
    Type: Application
    Filed: November 16, 2016
    Publication date: May 25, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Motoyoshi YAMANO, Tetsuo TOKUDA, Yoshikuni SASAKI, Hiroshi ONO, Hironori YAMAOKA, Ryohhei SUGIYAMA, Kohichi UTSUNOMIYA, Arinobu YOSHIURA, Hideo NAGAFUJI
  • Publication number: 20170131666
    Abstract: An image forming apparatus includes a fixing rotator rotatable in a predetermined direction of rotation, over which a recording medium is conveyed, and a heater to heat the fixing rotator. A temperature detector detects a temperature of the fixing rotator. A controller performs a primary productivity control to define a primary productivity rate of printing per unit time based on the temperature of the fixing rotator that is detected by the temperature detector. The controller calculates an amount of power suppliable to the heater and performs a secondary productivity control simultaneously with and separately from the primary productivity control. The secondary productivity control defines a secondary productivity rate of printing per unit time based on the amount of power suppliable to the heater. The controller selects one of the primary conductivity rate and the secondary productivity rate whichever is lower as a productivity rate of the image forming apparatus.
    Type: Application
    Filed: October 14, 2016
    Publication date: May 11, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Ryohhei SUGIYAMA, Hiroshi ONO, Hironori YAMAOKA, Motoyoshi YAMANO, Yoshikuni SASAKI, Tetsuo TOKUDA
  • Patent number: 9563157
    Abstract: A fixing device includes a fixing belt, a heating roller and a fixing roller over which the fixing belt is looped, a pressure roller forming a fixing nip with the fixing belt, a pair of side plates, one of the side plates being disposed on each end of a shaft of the fixing roller and each end of a shaft of the heating roller, and heating roller holding members to hold corresponding insulating bushing, and corresponding heating roller bearings, the heating roller holding members being attached to opening parts of the side plates. The heating roller holding members are formed of two separate components such that the heating roller is capable of moving along the opening parts formed in the side plates toward the fixing roller.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: February 7, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuichiro Kato, Tsukasa Satoh, Yoshikuni Sasaki
  • Publication number: 20160306311
    Abstract: A drive transmission unit transmits driving force to a driven unit including a driven rotator coupled to the drive transmission unit via a unit coupler. The drive transmission unit includes a driving source, a drive transmission member to transmit driving force from the driving source to the driven rotator by engaging the driven rotator, and a basal plate with a turning shaft portion at one end thereof. The basal plate supports the driving source and the drive transmission member thereon. The drive transmission unit is turned around the turning shaft portion together with the driven unit in a direction substantially orthogonal to a direction of a driving reaction force applied to the drive transmission member when the driven rotator receives the driving force from the drive transmission member.
    Type: Application
    Filed: April 19, 2016
    Publication date: October 20, 2016
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroshi ONO, Tetsuo TOKUDA, Yoshikuni SASAKI, Hironori YAMAOKA, Ryohhei SUGIYAMA, Yamano MOTOYOSHI
  • Patent number: 9316979
    Abstract: A fixing device includes a first roller contacting a fixing belt to generate a rotation friction force therebetween to rotate the fixing belt and a second roller contacting the fixing belt to exert a first inhibition force to the fixing belt in a direction opposite a direction of rotation of the fixing belt. A separation aid is disposed downstream from a fixing nip formed between the fixing belt and a pressure rotator in the direction of rotation of the fixing belt to decrease a curvature of the fixing belt and exert a second inhibition force to the fixing belt in the direction opposite the direction of rotation of the fixing belt. The second inhibition force is added to the first inhibition force to obtain a combined inhibition force that is smaller than the rotation friction force between the fixing belt and the first roller.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: April 19, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Nozawa, Masami Okamoto, Yoshikuni Sasaki, Yuuki Kikushima, Fumihiro Hirose, Keisuke Kubota, Shuutaroh Yuasa, Kaori Hemmi
  • Patent number: 9268276
    Abstract: A fixing device includes a fixing belt stretched taut across a fixing rotator and a support rotator. A pressure rotator is pressed against the fixing rotator via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium bearing a toner image is conveyed. The pressure rotator includes a recess defining an outer diameter of each lateral end of the pressure rotator in an axial direction thereof that is greater than an outer diameter of a center of the pressure rotator in the axial direction thereof. A first separator is disposed downstream from the fixing nip in a recording medium conveyance direction and contacts an inner circumferential surface of the fixing belt. The first separator is isolated from the pressure rotator and includes a projection disposed opposite the recess of the pressure rotator.
    Type: Grant
    Filed: March 6, 2015
    Date of Patent: February 23, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Fumihiro Hirose, Masami Okamoto, Keisuke Kubota, Kenji Nozawa, Yuuki Kikushima, Yoshikuni Sasaki, Kensuke Yamaji, Shuutaroh Yuasa, Kaori Hemmi
  • Patent number: 9244431
    Abstract: A fixing device includes an elastic rotator and a cooler disposed opposite the rotator to cool the rotator with cooling air. A mover contacts and moves the rotator to a first position where the rotator is disposed opposite the cooler with an increased first interval therebetween and a second position where the rotator is disposed opposite the cooler with a decreased second interval therebetween. A rectification plate is movably mounted on the cooler to contact the rotator constantly to guide the cooling air to the cooler.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: January 26, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuuki Kikushima, Masami Okamoto, Keisuke Kubota, Kenji Nozawa, Yoshikuni Sasaki, Fumihiro Hirose, Kensuke Yamaji, Shuutaroh Yuasa, Kaori Hemmi
  • Patent number: 9176444
    Abstract: The present invention is concerning to a fixing unit position-adjusting apparatus including: a first member configured to include a positioning portion that is formed on a lateral surface of the first member, the positioning portion being engaged with a positioning portion of a main body so that the first member is mounted on the main body in a manner positionable in a left and right direction; and a second member configured to include a reference pin insertion portion that is formed to receive insertion of a reference pin of the main body, the second member being assembled with the first member.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: November 3, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuichiro Kato, Yoshikuni Sasaki, Tsukasa Satoh
  • Publication number: 20150261183
    Abstract: A fixing device includes an elastic rotator and a cooler disposed opposite the rotator to cool the rotator with cooling air. A mover contacts and moves the rotator to a first position where the rotator is disposed opposite the cooler with an increased first interval therebetween and a second position where the rotator is disposed opposite the cooler with a decreased second interval therebetween. A rectification plate is movably mounted on the cooler to contact the rotator constantly to guide the cooling air to the cooler.
    Type: Application
    Filed: March 11, 2015
    Publication date: September 17, 2015
    Applicant: Ricoh Company, Ltd.
    Inventors: Yuuki KIKUSHIMA, Masami OKAMOTO, Keisuke KUBOTA, Kenji NOZAWA, Yoshikuni SASAKI, Fumihiro HIROSE, Kensuke YAMAJI, Shuutaroh YUASA, Kaori HEMMI
  • Publication number: 20150261154
    Abstract: A fixing device includes a first roller contacting a fixing belt to generate a rotation friction force therebetween to rotate the fixing belt and a second roller contacting the fixing belt to exert a first inhibition force to the fixing belt in a direction opposite a direction of rotation of the fixing belt. A separation aid is disposed downstream from a fixing nip formed between the fixing belt and a pressure rotator in the direction of rotation of the fixing belt to decrease a curvature of the fixing belt and exert a second inhibition force to the fixing belt in the direction opposite the direction of rotation of the fixing belt. The second inhibition force is added to the first inhibition force to obtain a combined inhibition force that is smaller than the rotation friction force between the fixing belt and the first roller.
    Type: Application
    Filed: February 26, 2015
    Publication date: September 17, 2015
    Applicant: Ricoh Company, Ltd.
    Inventors: Kenji NOZAWA, Masami OKAMOTO, Yoshikuni SASAKI, Yuuki KIKUSHIMA, Fumihiro HIROSE, Keisuke KUBOTA, Shuutaroh YUASA, Kaori HEMMI
  • Publication number: 20150253708
    Abstract: A fixing device includes a fixing belt stretched taut across a fixing rotator and a support rotator. A pressure rotator is pressed against the fixing rotator via the fixing belt to form a fixing nip between the fixing belt and the pressure rotator, through which a recording medium bearing a toner image is conveyed. The pressure rotator includes a recess defining an outer diameter of each lateral end of the pressure rotator in an axial direction thereof that is greater than an outer diameter of a center of the pressure rotator in the axial direction thereof A first separator is disposed downstream from the fixing nip in a recording medium conveyance direction and contacts an inner circumferential surface of the fixing belt. The first separator is isolated from the pressure rotator and includes a projection disposed opposite the recess of the pressure rotator.
    Type: Application
    Filed: March 6, 2015
    Publication date: September 10, 2015
    Inventors: Fumihiro HIROSE, Masami Okamoto, Keisuke Kubota, Kenji Nozawa, Yuuki Kikushima, Yoshikuni Sasaki, Kensuke Yamaji, Shuutaroh Yuasa, Kaori Hemmi
  • Publication number: 20140270873
    Abstract: A fixing device includes a fixing belt, a heating roller and a fixing roller over which the fixing belt is looped, a pressure roller forming a fixing nip with the fixing belt, a pair of side plates, one of the side plates being disposed on each end of a shaft of the fixing roller and each end of a shaft of the heating roller, and heating roller holding members to hold corresponding insulating bushing, and corresponding heating roller bearings, the heating roller holding members being attached to opening parts of the side plates. The heating roller holding members are formed of two separate components such that the heating roller is capable of moving along the opening parts formed in the side plates toward the fixing roller.
    Type: Application
    Filed: February 4, 2014
    Publication date: September 18, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yuichiro KATO, Tsukasa SATOH, Yoshikuni SASAKI
  • Publication number: 20140193175
    Abstract: The present invention is concerning to a fixing unit position-adjusting apparatus including: a first member configured to include a positioning portion that is formed on a lateral surface of the first member, the positioning portion being engaged with a positioning portion of a main body so that the first member is mounted on the main body in a manner positionable in a left and right direction; and a second member configured to include a reference pin insertion portion that is formed to receive insertion of a reference pin of the main body, the second member being assembled with the first member.
    Type: Application
    Filed: December 26, 2013
    Publication date: July 10, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yuichiro Kato, Yoshikuni Sasaki, Tsukasa Satoh
  • Patent number: 8755724
    Abstract: A fixing device including: an endless fixing belt that conveys a sheet-like medium having a toner image formed thereon; a heating member on which the fixing belt is wound and which includes a heater therein; a fixing member on which the fixing belt is wound; a pressing member that is disposed so as to face the fixing member with the fixing belt interposed therebetween; a separator that comes into contact with the surface of the pressing member and prevents the sheet-like medium from being wound on the pressing member; and a polisher that polishes the surface of the pressing member.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: June 17, 2014
    Assignee: Ricoh Company, Limited
    Inventor: Yoshikuni Sasaki
  • Publication number: 20120195653
    Abstract: A fixing device including: an endless fixing belt that conveys a sheet-like medium having a toner image formed thereon; a heating member on which the fixing belt is wound and which includes a heater therein; a fixing member on which the fixing belt is wound; a pressing member that is disposed so as to face the fixing member with the fixing belt interposed therebetween; a separator that comes into contact with the surface of the pressing member and prevents the sheet-like medium from being wound on the pressing member; and a polisher that polishes the surface of the pressing member.
    Type: Application
    Filed: January 10, 2012
    Publication date: August 2, 2012
    Inventor: Yoshikuni SASAKI
  • Patent number: 7844210
    Abstract: According to an aspect of the present invention, there is provided a fixing apparatus including: a heat roller that includes: a heat source that generates heat to be supplied on a toner image formed on a recording medium; a cylindrical core; a rubber layer that is formed on the cylindrical core and includes a thermal-conductivity-enhanced rubber, the rubber layer having a thickness of Tg that satisfies 200 ?m?Tg?600 ?m and having a rubber hardness defined by JIS-A hardness of Hg that satisfies 40 degrees?Hg?80 degrees; and a fluororesin layer that is formed on the rubber layer, the fluororesin layer having a thickness of Tj that satisfies 80 ?m?Tj?300 ?m and 2 Tj?Tg?10 Tj; and a pressure roller that presses the recording medium against the heat roller.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: November 30, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Sho Sawahata, Yuji Ohmura, Yoshikuni Sasaki
  • Publication number: 20080080912
    Abstract: According to an aspect of the present invention, there is provided a fixing apparatus including: a heat roller that includes: a heat source that generates heat to be supplied on a toner image formed on a recording medium; a cylindrical core; a rubber layer that is formed on the cylindrical core and includes a thermal-conductivity-enhanced rubber, the rubber layer having a thickness of Tg that satisfies 200 ?m ?Tg ?600 ?m and having a rubber hardness defined by JIS-A hardness of Hg that satisfies 40 degrees ?Hg ?80 degrees; and a fluororesin layer that is formed on the rubber layer, the fluororesin layer having a thickness of Tj that satisfies 80 ?m ?Tj?300 ?m and 2 Tj ?Tg ?10 Tj; and a pressure roller that presses the recording medium against the heat roller.
    Type: Application
    Filed: September 28, 2007
    Publication date: April 3, 2008
    Applicant: Ricoh Printing Systems, Ltd.
    Inventors: Sho Sawahata, Yuji Ohmura, Yoshikuni Sasaki