Patents by Inventor Tsuyoshi Koyama

Tsuyoshi Koyama 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).

  • Image forming and recording apparatus with three pressure members
    Patent number: 6928257
    Abstract: An image forming and recording apparatus, having a fixing apparatus for fixing unfixed toner image on a recording medium, wherein the fixing apparatus includes a fixing roller integrating a heater therein, an endless belt wound around the fixing roller, and three pressure members for pressing the endless belt onto the fixing roller. A pressure member located nearest to a side of entry of paper among the three pressure members is made up with a non-rotary type pressure member, and other two pressure members are made up with either one of a rotary type pressure member and the non-rotary type pressure member.
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: August 9, 2005
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Toshio Ogiso, Masaru Nakano, Hiromitsu Fukuda, Shigeru Obata, Toru Hanashima, Kazushige Oonishi, Chikara Hiraoka, Toru Ohashi, Akira Shimizu, Kazuo Kikuchi, Shogo Matsumoto, Shoji Ukei, Katsuyoshi Onose, Tsuyoshi Koyama
  • Image forming and recording apparatus
    Publication number: 20040057759
    Abstract: An image forming and recording apparatus, having a fixing apparatus for fixing unfixed toner image on a recording medium, wherein said fixing apparatus comprises: a fixing roller integrating a heater therein; an endless belt wound around said fixing roller; and three (3) pressure members for pressing said endless belt onto said fixing roller, wherein second one from a side of entry of paper is made at maximum in pressure loading, among said three (3) pressure members, thereby achieving stable fixing of oil-less toner at high speed.
    Type: Application
    Filed: June 27, 2003
    Publication date: March 25, 2004
    Inventors: Toshio Ogiso, Masaru Nakano, Hiromitsu Fukuda, Shigeru Obata, Toru Hanashima, Kazushige Oonishi, Chikara Hiraoka, Toru Ohashi, Akira Shimizu, Kazuo Kikuchi, Shogo Matsumoto, Shoji Ukei, Katsuyoshi Onose, Tsuyoshi Koyama