Patents by Inventor Yoshiyuki Fukuda

Yoshiyuki Fukuda 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: 6259876
    Abstract: The developing device of the present invention includes a developing magnet roller to supply developer to images to be developed, a first conveying auger arranged with a specified gap provided between the developing magnet roller to convey developer while stirring in the first longitudinal direction and supply developer to the developing magnet roller and a second conveying auger provided below the first conveying auger to receive developer conveyed from the first conveying auger and convey this received developer while stirring in the second longitudinal direction that is reverse to the first longitudinal direction and convey developer by circulating between the first conveying auger. This developing device further includes a housing to house the first conveying auger and developer so as to uniformly supply it to the developing magnet roller along the longitudinal direction irrespective of the developer accumulate height along the longitudinal conveying direction by the first conveying auger.
    Type: Grant
    Filed: November 3, 1998
    Date of Patent: July 10, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshiyuki Fukuda, Toshimi Yamashita
  • Patent number: 5701563
    Abstract: A developing apparatus includes a housing having a toner holding space and toner discharging aperature, a developing roller rotated in a predetermined direction in the aperature, a toner leveling member closing a gap between a periphery of the developing roller and an edge of the aperture at which the periphery of the developing roller is moved out from the aperture in its predetermined rotating direction, and slidably pressed against the periphery of the developing roller, a toner supplying roller rotated in the space and pressed against the periphery of the developing roller, and a sliding and closing member closing a gap between the periphery of the supplying roller and a portion of the inner surface of the housing corresponding to a gap between the periphery of the developing roller and an edge of the aperture at which the periphery of the developing roller is moved into the aperature in its predetermined rotating direction, and slidably pressed against the periphery of the supplying roller.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: December 23, 1997
    Assignee: Kabushiki Kaisha TEC
    Inventors: Yoshiyuki Fukuda, Katsura Kojima, Tadashi Sugiyama
  • Patent number: 5548386
    Abstract: An image forming apparatus for forming an image in accordance with an external signal comprises a photosensitive drum, a charging unit for charging the surface of the photosensitive drum at a predetermined potential, an exposing unit for exposing the surface of the photosensitive drum and forming an electrostatic latent image, a developing apparatus for developing the electrostatic latent image on the photosensitive drum and forming a visible image, a transfer unit for transferring the visible image on the photosensitive drum onto a medium, and a fixing unit for fixing the visible image transferred onto the medium.
    Type: Grant
    Filed: July 25, 1995
    Date of Patent: August 20, 1996
    Assignee: Kabushiki Kaisha TEC
    Inventor: Yoshiyuki Fukuda
  • Patent number: 5250992
    Abstract: An image forming apparatus includes a discharger for discharging a surface of an photoreceptor, a shield case arranged opposite to the photoreceptor and having an opening opposite to the photoreceptor a corona wire electrode arranged in the shield case and connected to a high voltage power source, a charger arranged in the opening of the shield case and having a grid grounded through a constant potential element for charging the photoreceptor surface, and an electrode arranged opposite the photoreceptor between the discharger and the charger and having a sharp edge opposite the photoreceptor. The electrode is grounded through the constant potential element and generates an unbalanced electric field between the electrode and the photoreceptor, thereby discharging charges located on the photoreceptor surface and having a polarity different from that of the electrode.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: October 5, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kenichi Tsuneeda, Yoshiyuki Fukuda
  • Patent number: 4466305
    Abstract: A reverse idler gear is mounted for rotation but against axial movement on a swingable reverse idler shaft and adapted to be moved into mesh with other gears to reverse the drive line or disengaged from same in response to the ocillatory motion of the reverse idler shaft.
    Type: Grant
    Filed: May 18, 1982
    Date of Patent: August 21, 1984
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kazuyoshi Hiraiwa, Yoshiyuki Fukuda