Patents by Inventor Chohtaroh Kataoka

Chohtaroh Kataoka 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: 7542712
    Abstract: A process cartridge including an image bearing member; a lubricant applicator, which includes a lubricant application member configured to apply a solid lubricant to the surface of the image bearing member; and a smoothing member configured to smooth the applied solid lubricant, and at least one of a charging device, a developing device and a cleaning device, wherein the amount of the solid lubricant present on a portion of surface of the image bearing member, which is located between the lubricant application member and the smoothing blade, is from 0.11 to 1.2 mg/m2. The smoothing member is preferably a blade having a JIS-A hardness of not less than 79°. The process cartridge is preferably assembled by a method including setting the lubricant smoothing member, the lubricant and the lubricant application member to a housing of the process cartridge; and then setting the image bearing member to the housing.
    Type: Grant
    Filed: September 13, 2006
    Date of Patent: June 2, 2009
    Assignee: Ricoh Company Limited
    Inventors: Shuji Tanaka, Shinichi Kawahara, Yoshiyuki Kimura, Hiroshi Hosokawa, Yoshio Hattori, Takeo Suda, Yutaka Takahashi, Takatsugu Fujishiro, Teruyuki Kasuga, Hiroomi Harada, Tokuya Ojimi, Masato Yanagida, Takaaki Tawada, Takeshi Tabuchi, Naohiro Kumagai, Chohtaroh Kataoka, Hidemasa Sato
  • Patent number: 7496323
    Abstract: A lubricant applying unit includes application mechanism that applies a lubricant from a solid lubricant on a surface of an image carrier that carries an image. The lubricant is a silicon-based-powder or a silicon-based-granule. Since the lubricant is less likely to adhere on a charging member that comes in contact with the image carrier, insufficient charge in the charging roller can be prevented, and a lifetime of the charging roller increases.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: February 24, 2009
    Assignee: Ricoh Company, Limited
    Inventors: Chohtaroh Kataoka, Shinichi Kawahara, Takeo Suda, Takaaki Tawada
  • Publication number: 20080013998
    Abstract: A powder transport unit for transporting powders includes a transport pipe, a powder transport member, and a regulating member. The transport pipe is curvingly extended. The powder transport member is disposed in an entire length of the transport pipe and rotates in the transport pipe to transport the powders. The regulating member is integrally formed with the transport pipe at a downstream end of the transport pipe, and regulates a length of the powder transport member disposed in the entire length of the transport pipe. The regulating member includes an exit hole to pass through the powders transported by the powder transport member in the transport pipe.
    Type: Application
    Filed: September 28, 2006
    Publication date: January 17, 2008
    Inventors: Naohiro Kumagai, Masato Yanagida, Shuji Tanaka, Takatsugu Fujishiro, Hiroomi Harada, Takeshi Tabuchi, Tokuya Ojimi, Chohtaroh Kataoka, Takaaki Tawada, Shinichi Kawahara, Haruji Mizuishi
  • Patent number: 7209698
    Abstract: An image forming apparatus includes an image bearing member configured to bear a toner image on a surface thereof. A charging mechanism is configured to uniformly charge the surface of the image bearing member. An intermediate transfer mechanism is configured to transfer the toner image from the image bearing member onto an image receiver. A cleaning mechanism is configured to clean the surface of the image bearing member after the toner image is transferred onto the image receiver. A lubricant supplying mechanism is configured to supply a lubricant contained therein onto the surface of the image bearing member and form a thin layer using a lubricating blade. The lubricant supplying mechanism is disposed between the cleaning mechanism and the charging mechanism.
    Type: Grant
    Filed: August 23, 2004
    Date of Patent: April 24, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Takaaki Tawada, Shinichi Kawahara, Takeo Suda, Chohtaroh Kataoka, Keiichi Yoshida, Haruji Mizuishi
  • Publication number: 20070059067
    Abstract: A process cartridge including an image bearing member; a lubricant applicator, which includes a lubricant application member configured to apply a solid lubricant to the surface of the image bearing member; and a smoothing member configured to smooth the applied solid lubricant, and at least one of a charging device, a developing device and a cleaning device, wherein the amount of the solid lubricant present on a portion of surface of the image bearing member, which is located between the lubricant application member and the smoothing blade, is from 0.11 to 1.2 mg/m2. The smoothing member is preferably a blade having a JIS-A hardness of not less than 79°. The process cartridge is preferably assembled by a method including setting the lubricant smoothing member, the lubricant and the lubricant application member to a housing of the process cartridge; and then setting the image bearing member to the housing.
    Type: Application
    Filed: September 13, 2006
    Publication date: March 15, 2007
    Inventors: Shuji Tanaka, Shinichi Kawahara, Yoshiyuki Kimura, Hiroshi Hosokawa, Yoshio Hattori, Takeo Suda, Yutaka Takahashi, Takatsugu Fujishiro, Teruyuki Kasuga, Hiroomi Harada, Tokuya Ojimi, Masato Yanagida, Takaaki Tawada, Takeshi Tabuchi, Naohiro Kumagai, Chohtaroh Kataoka, Hidemasa Sato
  • Patent number: 7035582
    Abstract: An image forming apparatus includes a moving member, a cleaning device that removes toner attached onto a surface of the moving member, and a lubricant applying device that is provided at the outside of the cleaning device and applies a lubricant onto the surface of the moving member to decrease the coefficient of friction between the surface of the moving member and a substance in contact with the surface of the moving member. The lubricant applying device includes a casing having an opening facing the surface of the moving member and having an inner wall surface. A closed space is formed by being surrounded by the inner wall surface of the casing and the surface of the moving member, and the lubricant applying device accommodates the lubricant in the closed space and applies the lubricant to the surface of the moving member in the closed space.
    Type: Grant
    Filed: June 7, 2004
    Date of Patent: April 25, 2006
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeo Suda, Shinichi Kawahara, Takaaki Tawada, Chohtaroh Kataoka
  • Publication number: 20050152722
    Abstract: An image forming apparatus includes an image bearing member configured to bear a toner image on a surface thereof. A charging mechanism is configured to uniformly charge the surface of the image bearing member. An intermediate transfer mechanism is configured to transfer the toner image from the image bearing member onto an image receiver. A cleaning mechanism is configured to clean the surface of the image bearing member after the toner image is transferred onto the image receiver. A lubricant supplying mechanism is configured to supply a lubricant contained therein onto the surface of the image bearing member and form a thin layer using a lubricating blade. The lubricant supplying mechanism is disposed between the cleaning mechanism and the charging mechanism.
    Type: Application
    Filed: August 23, 2004
    Publication date: July 14, 2005
    Inventors: Takaaki Tawada, Shinichi Kawahara, Takeo Suda, Chohtaroh Kataoka, Keiichi Yoshida, Haruji Mizuishi
  • Publication number: 20050084304
    Abstract: A lubricant applying unit includes application mechanism that applies a lubricant from a solid lubricant on a surface of an image carrier that carries an image. The lubricant is a silicon-based-powder or a silicon-based-granule. Since the lubricant is less likely to adhere on a charging member that comes in contact with the image carrier, insufficient charge in the charging roller can be prevented, and a lifetime of the charging roller increases.
    Type: Application
    Filed: August 27, 2004
    Publication date: April 21, 2005
    Inventors: Chohtaroh Kataoka, Shinichi Kawahara, Takeo Suda, Takaaki Tawada
  • Publication number: 20050019070
    Abstract: An image forming apparatus includes a moving member, a cleaning device that removes toner attached onto a surface of the moving member, and a lubricant applying device that is provided at the outside of the cleaning device and applies a lubricant onto the surface of the moving member to decrease the coefficient of friction between the surface of the moving member and a substance in contact with the surface of the moving member. The lubricant applying device includes a casing having an opening facing the surface of the moving member and having an inner wall surface. A closed space is formed by being surrounded by the inner wall surface of the casing and the surface of the moving member, and the lubricant applying device accommodates the lubricant in the closed space and applies the lubricant to the surface of the moving member in the closed space.
    Type: Application
    Filed: June 7, 2004
    Publication date: January 27, 2005
    Inventors: Takeo Suda, Shinichi Kawahara, Takaaki Tawada, Chohtaroh Kataoka