Patents by Inventor Kohji Amanai

Kohji Amanai 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 apparatus
    Patent number: 7050738
    Abstract: A transmission device includes a rotation shaft, a gear coaxially fixed to the rotation shaft by press-fitting, and a restriction member fixed to the rotation shaft for restricting perpendicularity of the gear to the axial line of the rotation shaft by pressing in contact with one end face of the gear so as to transmit the rotation of the driven gear onto the rotation shaft for rotating a photosensitive drum fixed to the rotation shaft. The rotation shaft can be fitted into a mounting hole of the gear with a small force so as to improve efficiency in assembling these components.
    Type: Grant
    Filed: June 1, 2004
    Date of Patent: May 23, 2006
    Assignee: Ricoh Company, Ltd.
    Inventor: Kohji Amanai
  • Rotationally phase-matched driving device and image forming apparatus including the same
    Patent number: 6889022
    Abstract: A driving device for driving a plurality of driven members of the present invention includes a first drive source for driving first one of the driven members. A second drive source drives second driven members other than the first drive member. An idler gear intervenes between the second driven members for transmitting the output torque of the second drive source. The second driven members are matched in rotation variation phase to each other during assembly.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: May 3, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhisa Ehara, Kohji Amanai
  • Photoconductive element unit including support portions configured to adjust eccentricity positions for an image forming apparatus
    Patent number: 6879795
    Abstract: In an image forming apparatus of the present invention including a plurality of photoconductive drums arranged side by side, each photoconductive drum is configured to allow its opposite end portions in the main scanning direction to be adjusted in maximum eccentricity position in the direction of rotation independently of each other. The maximum eccentricity positions of the drums are capable of being matched in phase to each other in the direction of rotation at each of opposite end portions.
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: April 12, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Michihito Ohashi, Kohji Amanai, Tetsuya Nakao, Hideaki Sugata, Toshio Shimazaki
  • Image-forming apparatus
    Publication number: 20050019063
    Abstract: A transmission device includes a rotation shaft, a gear coaxially fixed to the rotation shaft by press-fitting, and a restriction member fixed to the rotation shaft for restricting perpendicularity of the gear to the axial line of the rotation shaft by pressing in contact with one end face of the gear so as to transmit the rotation of the driven gear onto the rotation shaft for rotating a photosensitive drum fixed to the rotation shaft. The rotation shaft can be fitted into a mounting hole of the gear with a small force so as to improve efficiency in assembling these components.
    Type: Application
    Filed: June 1, 2004
    Publication date: January 27, 2005
    Inventor: Kohji Amanai
  • Photoconductive element unit for an image forming apparatus
    Publication number: 20030180072
    Abstract: In an image forming apparatus of the present invention including a plurality of photoconductive drums arranged side by side, each photoconductive drum is configured to allow its opposite end portions in the main scanning direction to be adjusted in maximum eccentricity position in the direction of rotation independently of each other. The maximum eccentricity positions of the drums are capable of being matched in phase to each other in the direction of rotation at each of opposite end portions.
    Type: Application
    Filed: March 11, 2003
    Publication date: September 25, 2003
    Inventors: Michihito Ohashi, Kohji Amanai, Tetsuya Nakao, Hideaki Sugata, Toshio Shimazaki
  • Driving device and image forming apparatus including the same
    Publication number: 20030152402
    Abstract: A driving device for driving a plurality of driven members of the present invention includes a first drive source for driving first one of the driven members. A second drive source drives second driven members other than the first drive member. An idler gear intervenes between the second driven members for transmitting the output torque of the second drive source. The second driven members are matched in rotation variation phase to each other during assembly.
    Type: Application
    Filed: December 27, 2002
    Publication date: August 14, 2003
    Inventors: Yasuhisa Ehara, Kohji Amanai