Patents by Inventor Kenji Sugirua

Kenji Sugirua 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: 9811046
    Abstract: An image forming apparatus includes a rotatable image bearer, a toner image forming device, a transfer device, a transfer bias power source, and a cleaner. The toner image forming device is to form a toner image on the image bearer. The transfer device contacts a surface of the image bearer to form a transfer nip between the transfer device and the image bearer. The transfer bias power source is to output a transfer bias to transfer the toner image from the image bearer onto a recording medium in the transfer nip. The cleaner is disposed downstream from the transfer nip in a direction of rotation of the image bearer, to electrostatically attract and remove toner from the surface of the image bearer to a surface of the cleaner. The transfer bias includes an alternating current component.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: November 7, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuuji Wada, Naohiro Kumagai, Seiichi Kogure, Junpei Fujita, Kazuki Yogosawa, Kenji Sugirua, Takehide Mizutani, Tatsuya Ohsugi, Hiroyoshi Haga, Hirokazu Ishii
  • Publication number: 20160306317
    Abstract: An image forming apparatus comprises a rotatable image bearer, a toner image forming device, a transfer device, a transfer bias power source, and a cleaner. The toner image forming device is to form a toner image on the image bearer. The transfer device contacts a surface of the image bearer to form a transfer nip between the transfer device and the image bearer. The transfer bias power source is to output a transfer bias to transfer the toner image from the image bearer onto a recording medium in the transfer nip. The cleaner is disposed downstream from the transfer nip in a direction of rotation of the image bearer, to electrostatically attract and remove toner from the surface of the image bearer to a surface of the cleaner. The transfer bias includes an alternating current component.
    Type: Application
    Filed: June 22, 2016
    Publication date: October 20, 2016
    Inventors: YUUJI WADA, Naohiro Kumagai, Seiichi Kogure, Junpei Fujita, Kazuki Yogosawa, Kenji Sugirua, Takehide Mizutani, Tatsuya Ohsugi, Hiroyoshi Haga, Hirokazu Ishii