Patents by Inventor Hiroshi Mizusawa

Hiroshi Mizusawa 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: 10514651
    Abstract: A cleaning blade includes an edge portion made of an elastic material having a rebound resilience value R35 at 35° C. and a 100% modulus value M35 at 35° C. that satisfy the relation R35??4.8 M35+42.
    Type: Grant
    Filed: July 10, 2019
    Date of Patent: December 24, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuhiko Watanabe, Hiroshi Nakai, Hiroshi Mizusawa, Tomoyuki Kirigane, Yasuhide Nakazawa
  • Publication number: 20180373198
    Abstract: A process cartridge includes an image bearer to bear a toner image, a lubricant supply device to supply a lubricant to the surface of the image bearer, and a blade made of elastic material, with the leading end abutting the surface of the image bearer, wherein the leading end is formed to have an elasticity power of from 65 to 93 percent, wherein the process cartridge is detachably attachable to an image forming apparatus.
    Type: Application
    Filed: June 26, 2018
    Publication date: December 27, 2018
    Inventors: Hiroshi Mizusawa, Hiroshi Nakai, Hisashi Kikuchi, Kazuhiko Watanabe, Sho Akiyama, Tomoyuki Kirigane, Kenji Komito
  • Patent number: 10018941
    Abstract: A cleaning device includes a cleaning blade disposed in contact with a rotator, a toner collecting section disposed along the rotator and the cleaning blade and includes a groove extending in an axial direction of the rotator, a conveyor disposed in the groove, and an agitator disposed on a side of a rim of the groove. The conveyor rotates to convey the toner in a longitudinal direction of the groove. The agitator vibrates through contact with the conveyor and includes comb-tooth portions lined in a comb shape in the longitudinal direction of the groove, and bent portions, each of which is bent from an end of one of the comb-tooth portions. The comb-tooth portions contact a circumference of the conveyor to vibrate. The bent portions are lined at intervals smaller than intervals on a base side of the comb-tooth portions.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: July 10, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Daisuke Tomita, Takeshi Shintani, Hiroshi Mizusawa, Yasuhiro Maehata, Yasuhito Kuboshima, Yuta Azeyanagi
  • Patent number: 9983512
    Abstract: A toner conveyance device includes a downward passage, a reciprocating member disposed in the downward passage, to move in a vertical direction in which the downward passage extends, a conveyance passage communicating with a lower end of the downward passage and extending in a direction crossing the vertical direction, a conveyor to rotate in the conveyance passage around an axis extending along the conveyance passage to transport the toner, and a flexible member projecting from a bottom of the reciprocating member toward the conveyance passage. The flexible member extends in the axial direction of the conveyor and moves together with the reciprocating member. When the reciprocating member is at a lowest position, a lower end of the flexible member opposes a portion of the conveyor downstream from an upper end thereof in a rotation direction thereof.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: May 29, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yusuke Ishizuka, Takeshi Shintani, Yasuhiro Maehata, Hiroshi Mizusawa, Daisuke Tomita, Yuta Azeyanagi, Yasuhito Kuboshima
  • Publication number: 20170269511
    Abstract: A cleaning device includes a cleaning blade disposed in contact with a rotator, a toner collecting section disposed along the rotator and the cleaning blade and includes a groove extending in an axial direction of the rotator, a conveyor disposed in the groove, and an agitator disposed on a side of a rim of the groove. The conveyor rotates to convey the toner in a longitudinal direction of the groove. The agitator vibrates through contact with the conveyor and includes comb-tooth portions lined in a comb shape in the longitudinal direction of the groove, and bent portions, each of which is bent from an end of one of the comb-tooth portions. The comb-tooth portions contact a circumference of the conveyor to vibrate. The bent portions are lined at intervals smaller than intervals on a base side of the comb-tooth portions.
    Type: Application
    Filed: March 16, 2017
    Publication date: September 21, 2017
    Inventors: Daisuke TOMITA, Takeshi Shintani, Hiroshi Mizusawa, Yasuhiro Maehata, Yasuhito Kuboshima, Yuta Azeyanagi
  • Publication number: 20170261887
    Abstract: A toner conveyance device includes a downward passage, a reciprocating member disposed in the downward passage, to move in a vertical direction in which the downward passage extends, a conveyance passage communicating with a lower end of the downward passage and extending in a direction crossing the vertical direction, a conveyor to rotate in the conveyance passage around an axis extending along the conveyance passage to transport the toner, and a flexible member projecting from a bottom of the reciprocating member toward the conveyance passage. The flexible member extends in the axial direction of the conveyor and moves together with the reciprocating member. When the reciprocating member is at a lowest position, a lower end of the flexible member opposes a portion of the conveyor downstream from an upper end thereof in a rotation direction thereof.
    Type: Application
    Filed: February 10, 2017
    Publication date: September 14, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Yusuke ISHIZUKA, Takeshi Shintani, Yasuhiro Maehata, Hiroshi Mizusawa, Daisuke Tomita, Yuta Azeyanagi, Yasuhito Kuboshima
  • Patent number: 9753426
    Abstract: An image bearer protective agent is provided. The image bearer protective agent includes a fatty acid metal salt and an inorganic lubricant. The inorganic lubricant includes a first inorganic lubricant having a tap density of from 0.30 to 0.8 g/cm2.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: September 5, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Komito, Hiroshi Nakai, Kohsuke Yamamoto, Hiroshi Mizusawa, Sho Akiyama
  • Publication number: 20170090399
    Abstract: An image bearer protective agent is provided. The image bearer protective agent includes a fatty acid metal salt and an inorganic lubricant. The inorganic lubricant includes a first inorganic lubricant having a tap density of from 0.30 to 0.8 g/cm2.
    Type: Application
    Filed: September 20, 2016
    Publication date: March 30, 2017
    Inventors: Kenji KOMITO, Hiroshi NAKAI, Kohsuke YAMAMOTO, Hiroshi MIZUSAWA, Sho AKIYAMA
  • Patent number: 9405227
    Abstract: A powder conveying device, including: a powder conveying path including a curved portion; and a conveying screw, wherein the conveying screw is disposed in the powder conveying path, and includes: a rotation axis portion having flexibility; and a blade portion, where the blade portion is helically formed on an outer periphery of the rotation axis portion, and is configured to convey a powder, wherein the conveying screw includes a conveying screw curved portion located in the curved portion of the powder conveying path, and wherein at least a surface of the blade portion of the conveying screw curved portion includes a slipping layer containing a silicon-containing compound.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: August 2, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Mizusawa, Kuniyori Takano, Takuya Sekine, Kohsuke Yamamoto
  • Publication number: 20150346638
    Abstract: A powder conveying device, including: a powder conveying path including a curved portion; and a conveying screw, wherein the conveying screw is disposed in the powder conveying path, and includes: a rotation axis portion having flexibility; and a blade portion, where the blade portion is helically formed on an outer periphery of the rotation axis portion, and is configured to convey a powder, wherein the conveying screw includes a conveying screw curved portion located in the curved portion of the powder conveying path, and wherein at least a surface of the blade portion of the conveying screw curved portion includes a slipping layer containing a silicon-containing compound.
    Type: Application
    Filed: May 4, 2015
    Publication date: December 3, 2015
    Inventors: Hiroshi MIZUSAWA, Kuniyori TAKANO, Takuya SEKINE, Kohsuke YAMAMOTO
  • Patent number: 9031456
    Abstract: Disclosed is an image forming apparatus that is to be detachably attached by a detachable unit, wherein the detachable unit includes a unit side connector that fits a main body side connector disposed in a main body of the image forming apparatus by an attaching operation for attaching the detachable unit to the main body of the image forming apparatus, wherein one of the detachable unit and the main body of the image forming apparatus includes a concave portion extended in an attaching direction in which the detachable unit is attached to the main body of the image forming apparatus, and wherein the other one of the detachable unit and the main body of the image forming apparatus includes a convex portion disposed at a position corresponding to the concave portion.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: May 12, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroshi Mizusawa
  • Patent number: 8588672
    Abstract: A lubricant applicator includes a solid lubricant, a lubricant applying member to apply the solid lubricant to a target object, a biasing member to bias the solid lubricant toward the lubricant applying member, and a regulating member to regulate the solid lubricant, which is biased toward the lubricant applying member by the biasing member, to prevent the lubricant from separating from the lubricant applying member by more than a predetermined distance. The regulating member is switchable between a regulating state for regulating the solid lubricant not to separate from the lubricant applying member by more than the predetermined distance and a non-regulating state.
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: November 19, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuji Arai, Ken Amemiya, Satoshi Hatori, Toshio Koike, Michiya Okamoto, Takuma Iwasaki, Hiroshi Mizusawa
  • Patent number: 8543029
    Abstract: An image forming apparatus includes multiple image bearing members provided in tandem, multiple developing devices configured to develop the respective electrostatic latent images, an intermediate transfer member onto which the multiple toner images are transferred to form a composite toner image, multiple first lubricant applicators configured to apply a lubricant to the respective image bearing members, and a second lubricant applicator configured to apply a lubricant to the intermediate transfer member. The second lubricant applicator is provided upstream from the extreme upstream image bearing member. The amount of the first lubricant applied from the extreme upstream first lubricant applicator to the extreme upstream image bearing member is based on at least one of an amount of the second lubricant applied from the second lubricant applicator to the intermediate transfer member and an amount of first lubricant applied from each of the other lubricant applicators to the respective image bearing members.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: September 24, 2013
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroshi Mizusawa
  • Publication number: 20130163998
    Abstract: Disclosed is an image forming apparatus that is to be detachably attached by a detachable unit, wherein the detachable unit includes a unit side connector that fits a main body side connector disposed in a main body of the image forming apparatus by an attaching operation for attaching the detachable unit to the main body of the image forming apparatus, wherein one of the detachable unit and the main body of the image forming apparatus includes a concave portion extended in an attaching direction in which the detachable unit is attached to the main body of the image forming apparatus, and wherein the other one of the detachable unit and the main body of the image forming apparatus includes a convex portion disposed at a position corresponding to the concave portion.
    Type: Application
    Filed: December 6, 2012
    Publication date: June 27, 2013
    Inventor: Hiroshi MIZUSAWA
  • Patent number: 8472856
    Abstract: An image forming apparatus includes a plurality of image forming units that are arranged in parallel so as to be opposed to an intermediate transfer belt or a transfer carriage belt. A black image forming unit that forms a black toner image is arranged at a downstream end or upstream end in the running direction of the intermediate transfer belt or the transfer carriage belt with respect to the other image forming units. The black image forming unit is configured so that its lubricant supplying unit contains a larger amount of lubricant.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: June 25, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Hiromichi Ninomiya, Hiroshi Mizusawa, Naohiro Kumagai, Hiroki Matsuura, Yoshinori Ozawa
  • Publication number: 20110274474
    Abstract: A lubricant applicator includes a solid lubricant, a lubricant applying member to apply the solid lubricant to a target object, a biasing member to bias the solid lubricant toward the lubricant applying member, and a regulating member to regulate the solid lubricant, which is biased toward the lubricant applying member by the biasing member, to prevent the lubricant from separating from the lubricant applying member by more than a predetermined distance. The regulating member is switchable between a regulating state for regulating the solid lubricant not to separate from the lubricant applying member by more than the predetermined distance and a non-regulating state.
    Type: Application
    Filed: May 3, 2011
    Publication date: November 10, 2011
    Applicant: Ricoh Company, Ltd.
    Inventors: Yuji Arai, Ken Amemiya, Satoshi Hatori, Toshio Koike, Michiya Okamoto, Takuma Iwasaki, Hiroshi Mizusawa
  • Publication number: 20110206432
    Abstract: An image forming apparatus includes a plurality of image forming units that are arranged in parallel so as to be opposed to an intermediate transfer belt or a transfer carriage belt. A black image forming unit that forms a black toner image is arranged at a downstream end or upstream end in the running direction of the intermediate transfer belt or the transfer carriage belt with respect to the other image forming units. The black image forming unit is configured so that its lubricant supplying unit contains a larger amount of lubricant.
    Type: Application
    Filed: February 9, 2011
    Publication date: August 25, 2011
    Applicant: Ricoh Company, Limited
    Inventors: Hiromichi Ninomiya, Hiroshi Mizusawa, Naohiro Kumagai, Hiroki Matsuura, Yoshinori Ozawa
  • Publication number: 20110064452
    Abstract: An image forming apparatus including multiple image bearing members that bear respective electrostatic latent images, provided in tandem; multiple developing devices that develop the respective electrostatic latent images with toner to form respective toner images; an intermediate transfer member onto which the multiple toner images are transferred to form a composite toner image; multiple first lubricant applicators that apply a lubricant to the respective image bearing members; and a second lubricant applicator that applies a lubricant to the intermediate transfer member, provided upstream from the extreme upstream image bearing member. In this image forming apparatus, the amount of lubricant applied from the extreme upstream first lubricant applicator to the extreme upstream image bearing member is smaller than that applied from each of the other lubricant applicators to the respective image bearing members.
    Type: Application
    Filed: September 14, 2010
    Publication date: March 17, 2011
    Applicant: Ricoh Company, Ltd.
    Inventor: Hiroshi Mizusawa
  • Patent number: 7313347
    Abstract: A cleaning device, a process cartridge, an image forming apparatus, and toner to maintain improved cleaning performance for a long time. The cleaning device includes a cleaning blade, a lubricant applying part, and a toner removing part. The cleaning blade is disposed in contact with a surface of an image bearing member. The lubricant applying part coats a solid lubricant on the surface of the image bearing member, and is disposed in an upstream side from the cleaning blade with respect to a rotational direction of the image bearing member. The toner removing part removes toner particles, and is disposed in an upstream side from the lubricant applying part with respect to the rotational direction of the image bearing member.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: December 25, 2007
    Assignee: Ricoh Company Ltd.
    Inventors: Takeshi Shintani, Takuzi Yoneda, Ken Amemiya, Takaaki Tawada, Tokuya Ojimi, Toshio Koike, Yuji Arai, Masanori Kawasumi, Masami Tomita, Hideyo Watanabe, Satoshi Takano, Haruji Mizuishi, Hiroshi Ono, Hiroshi Mizusawa, Satoshi Hatori, Takeshi Tabuchi, Akira Fujimori, Kaoru Yoshino
  • Patent number: D750702
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: March 1, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hirobumi Ooyoshi, Masayuki Yamane, Hiroshi Mizusawa