Patents by Inventor Shohji Hayashi

Shohji Hayashi 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: 6594464
    Abstract: A fixing device for an image forming apparatus includes a heat roller, a fixing roller, an endless belt passed over the heat roller and fixing roller and driven to turn, a press roller pressed against the fixing roller with the intermediary of the endless belt. A recording medium is passed between the belt and the press roller. The fixing device additionally includes at least one contact member contacting the belt. Part of the at least one contact member is formed of at least one of heat-resistant felt or heat-resistant resin. The contact member contacts the surface of part of the belt contacting the heat roller.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: July 15, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Shohji Hayashi, Tadao Uehara
  • Patent number: 6496666
    Abstract: A fixing device having an endless fixing belt configured to convey a sheet-like medium on which a toner image is to be fixed, heating and fixing rollers having the fixing belt wound thereon, and a pressing roller disposed opposite to the fixing roller having fixing belt wound thereon to form a nip portion between the fixing belt and pressing roller. The fixing device also including first to third heaters provided in the heating, pressure and fixing rollers respectively, and first to third voltage applying devices configured to apply voltages to the first to third heaters respectively. The nip portion is configured to perform the fixing only by pressure contact between said fixing and pressing rollers via said fixing belt.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: December 17, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Shohji Hayashi, Tadao Uehara, Kenichi Hasegawa, Setsuo Soga
  • Publication number: 20020044807
    Abstract: An image forming apparatus of the present invention includes a heat roller, a fixing roller, a press roller pressed against the fixing roller, and an endless belt passed over the heat roller and fixing roller. The surface of the press roller and that of the fixing roller have hardness of 70 or above and hardness of 60 or above, respectively, in terms of ASKER-C hardness. This successfully prevents a recording medium from wrapping around the belt and jamming a path or creasing.
    Type: Application
    Filed: October 11, 2001
    Publication date: April 18, 2002
    Inventors: Tadao Uehara, Shohji Hayashi
  • Publication number: 20020044806
    Abstract: A fixing device for an image forming apparatus of the present invention includes a heat roller, a fixing roller, an endless belt passed over the heat roller and fixing roller and driven to turn, a press roller pressed against the fixing roller with the intermediary of the endless belt. The recording medium is passed between the belt and the press roller. The device additionally includes at least one contact member contacting the belt. Part of the at least one contact member is formed of at least one of heat-resistant felt and heat-resistant resin. The contact member contacts the surface of part of the belt contacting the heat roller.
    Type: Application
    Filed: October 12, 2001
    Publication date: April 18, 2002
    Inventors: Shohji Hayashi, Tadao Uehara
  • Publication number: 20020009306
    Abstract: A fixing device having an endless fixing belt configured to convey a sheet-like medium on which a toner image is to be fixed, heating and fixing rollers having the fixing belt wound thereon, and a pressing roller disposed opposite to the fixing roller having fixing belt wound thereon to form a nip portion between the fixing belt and pressing roller. The fixing device also including first to third heaters provided in the heating, pressure and fixing rollers respectively, and first to third voltage applying devices configured to apply voltages to the first to third heaters respectively. The nip portion is configured to perform the fixing only by pressure contact between said fixing and pressing rollers via said fixing belt.
    Type: Application
    Filed: May 23, 2001
    Publication date: January 24, 2002
    Applicant: RICOH COMPANY, LTD.
    Inventors: Shohji Hayashi, Tadao Uehara, Kenichi Hasegawa, Setsuo Soga
  • Patent number: 6167230
    Abstract: A simple, low cost image forming apparatus for transferring a toner image from a photoconductive element, intermediate image transfer body or similar image carrier to a recording medium and an image transferring device therefor are disclosed. When a discharger for separating a paper or similar recording-medium from the image carrier is located on a path along which the surface of the image carrier moved away from an image transfer nip (in early moves for, e.g., layout reasons, the defective separation of the trailing edge of the paper is obviated which would scatter a toner image. The trailing edge of the paper is substantially prevented from jumping up and contacting a structural element included in the apparatus.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: December 26, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Takayuki Kimura, Shohji Hayashi, Yasuhiro Sagawa, Satoru Uchida