Patents by Inventor Muraishi Takaya

Muraishi Takaya 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: 7680429
    Abstract: A charging device, a process cartridge, and an image forming apparatus are provided. The charging device includes a charging roller configured to charge an image carrier and a cleaning roller configured to clean the charging roller while making contact with a surface of the charging roller. The charging device further includes a bearing member including a first portion configured to rotatably support a rotational shaft of the charging roller and a second portion configured to rotatably support a rotational shaft of the cleaning roller. The charging device also includes an elastic member provided outside of the second portion of the bearing member with respect to an axial direction of the rotational shaft of the cleaning roller such that the charging roller makes contact with the image carrier when the first portion of the bearing member is pressed by the elastic member.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: March 16, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Muraishi Takaya, Hiromichi Ninomiya, Atsushi Sampe, Yoshiyuki Kimura, Hiroyuki Nagashima, Hiroshi Hosokawa, Ken Amemiya, Toshio Koike, Tokuya Ojimi, Takaaki Tawada, Takeshi Shintani, Yuji Arai, Takuji Yoneda, Masanori Kawasumi, Masami Tomita
  • Publication number: 20090087213
    Abstract: A charging device, a process cartridge, and an image forming apparatus are provided. The charging device includes a charging roller configured to charge an image carrier and a cleaning roller configured to clean the charging roller while making contact with a surface of the charging roller. The charging device further includes a bearing member including a first portion configured to rotatably support a rotational shaft of the charging roller and a second portion configured to rotatably support a rotational shaft of the cleaning roller. The charging device also includes an elastic member provided outside of the second portion of the bearing member with respect to an axial direction of the rotational shaft of the cleaning roller such that the charging roller makes contact with the image carrier when the first portion of the bearing member is pressed by the elastic member.
    Type: Application
    Filed: November 18, 2008
    Publication date: April 2, 2009
    Inventors: Muraishi Takaya, Hiromichi Ninomiya, Atsushi Sampe, Yoshiyuki Kimura, Hiroyuki Nagashima, Hiroshi Hosokawa, Ken Amemiya, Toshio Koike, Tokuya Ojimi, Takaaki Tawada, Takeshi Shintani, Yuji Arai, Takuji Yoneda, Masanori Kawasumi, Masami Tomita
  • Patent number: 7477862
    Abstract: There is provided a cleaning device for an image-forming device configured so as to be capable of preventing the image quality from deteriorating by being able to prevent the deterioration of the charging state caused by deposits of foreign matter without increasing costs. There is also provided a cleaning member that can make contact with the cleaning target-members. The cleaning member has a portion composed of melamine resin foam for making contact with at least the cleaning target members, and the melamine resin foam has an Asker F hardness of 5 to 25 points and a hardness variation of 5 points or less, and is used on the cleaning target members in a state obtained by heat compression from the original shape. The pressing member is furthermore disposed in contact with the cleaning member.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: January 13, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Muraishi Takaya, Hiromichi Ninomiya, Atsushi Sampe, Yoshiyuki Kimura, Hiroyuki Nagashima, Hiroshi Hosokawa, Ken Amemiya, Toshio Koike, Tokuya Ojimi, Takaaki Tawada, Takeshi Shintani, Yuji Arai, Takuji Yoneda, Masanori Kawasumi, Masami Tomita