Patents by Inventor Yoshiharu Kishi
Yoshiharu Kishi 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: 9921541Abstract: A developing device includes a developer bearer to carry, by rotation, developer including toner and magnetic carrier to a developing range facing a latent image bearer; a casing including a developer container and an opening to expose a part of the developer bearer disposed in the casing; an opposing face of the casing including a conductive material and opposing to a surface of the developer bearer downstream from the developing range in a direction of rotation of the developer bearer; a developing bias source to apply a developing bias to the developer bearer; and an insulation layer disposed on the opposing face of the casing. The opposing face is disposed across, from the developer bearer, a casing gap sized to allow the developer borne on the developer bearer to contact the opposing face.Type: GrantFiled: May 22, 2015Date of Patent: March 20, 2018Assignee: RICOH COMPANY, LTD.Inventors: Yasunobu Shimizu, Akira Azami, Masaaki Yamada, Yoshiko Ogawa, Toshio Koike, Mutsuki Morinaga, Yutaka Takahashi, Keinosuke Kondoh, Kentaro Mikuniya, Yoshiharu Kishi
-
Patent number: 9772579Abstract: A developing device includes a developer bearer disposed facing a latent image bearer in a developing range to transport developer by rotation, a support to support the developer bearer and including a holder mount, a rod-shaped developer regulator disposed facing a surface of the developer bearer across a gap, and a holder secured to the holder mount of the support to hold the rod-shaped developer regulator. The rod-shaped developer regulator extends in an axial direction of the developer bearer.Type: GrantFiled: December 30, 2016Date of Patent: September 26, 2017Assignee: Ricoh Company, Ltd.Inventors: Yuki Oshikawa, Akira Azami, Yoshiko Ogawa, Masaaki Yamada, Yoshihiro Fujiwara, Noriyuki Kimura, Yoshiharu Kishi, Yasunobu Shimizu, Junichi Matsumoto, Yoshiyuki Fukuda, Yuuji Ishikura, Kei Saito
-
Publication number: 20170108795Abstract: A developing device includes a developer bearer disposed facing a latent image hearer in a developing range to transport developer by rotation, a support to support the developer bearer and including a holder mount, a rod-shaped developer regulator disposed facing a surface of the developer bearer across a gap, and a holder secured to the holder mount of the support to hold the rod-shaped developer regulator. The rod-shaped developer regulator extends in an axial direction of the developer bearer.Type: ApplicationFiled: December 30, 2016Publication date: April 20, 2017Inventors: Yuki OSHIKAWA, Akira Azami, Yoshiko Ogawa, Masaaki Yamada, Yoshihiro Fujiwara, Noriyuki Kimura, Yoshiharu Kishi, Yasunobu Shimizu, Junichi Matsumoto, Yoshiyuki Fukuda, Yuuji Ishikura, Kei Saito
-
Patent number: 9625851Abstract: A developing device includes a developer bearer disposed facing a latent image bearer in a developing range to transport developer by rotation, a support to support the developer bearer and including a holder mount, a rod-shaped developer regulator disposed facing a surface of the developer bearer across a gap, and a holder secured to the holder mount of the support to hold the rod-shaped developer regulator. The rod-shaped developer regulator extends in an axial direction of the developer bearer.Type: GrantFiled: February 1, 2016Date of Patent: April 18, 2017Assignee: Ricoh Company, Ltd.Inventors: Yuki Oshikawa, Akira Azami, Yoshiko Ogawa, Masaaki Yamada, Yoshihiro Fujiwara, Noriyuki Kimura, Yoshiharu Kishi, Yasunobu Shimizu, Junichi Matsumoto, Yoshiyuki Fukuda, Yuuji Ishikura, Kei Saito
-
Publication number: 20160238966Abstract: A developing device includes a developer bearer disposed facing a latent image bearer in a developing range to transport developer by rotation, a support to support the developer bearer and including a holder mount, a rod-shaped developer regulator disposed facing a surface of the developer bearer across a gap, and a holder secured to the holder mount of the support to hold the rod-shaped developer regulator. The rod-shaped developer regulator extends in an axial direction of the developer bearer.Type: ApplicationFiled: February 1, 2016Publication date: August 18, 2016Inventors: Yuki OSHIKAWA, Akira AZAMI, Yoshiko OGAWA, Masaaki YAMADA, Yoshihiro FUJIWARA, Noriyuki KIMURA, Yoshiharu KISHI, Yasunobu SHIMIZU, Junichi MATSUMOTO, Yoshiyuki FUKUDA, Yuuji ISHIKURA, Kei SAITO
-
Publication number: 20150338824Abstract: A developing device includes a developer bearer to carry, by rotation, developer including toner and magnetic carrier to a developing range facing a latent image bearer; a casing including a developer container and an opening to expose a part of the developer bearer disposed in the casing; an opposing face of the casing including a conductive material and opposing to a surface of the developer bearer downstream from the developing range in a direction of rotation of the developer bearer; a developing bias source to apply a developing bias to the developer bearer; and an insulation layer disposed on the opposing face of the casing. The opposing face is disposed across, from the developer bearer, a casing gap sized to allow the developer borne on the developer bearer to contact the opposing face.Type: ApplicationFiled: May 22, 2015Publication date: November 26, 2015Applicant: RICOH COMPANY, LTD.Inventors: Yasunobu Shimizu, Akira Azami, Masaaki Yamada, Yoshiko Ogawa, Toshio Koike, Mutsuki Morinaga, Yutaka Takahashi, Keinosuke Kondoh, Kentaro Mikuniya, Yoshiharu Kishi
-
Publication number: 20130177341Abstract: An image forming apparatus includes an image carrier, a transferor, a fixing unit, and a guide. The image carrier carries a toner image. The transferor opposes the image carrier to form a transfer nip and transfers the toner image on the image carrier onto a recording medium at the transfer nip. The fixing unit fixes the toner image on the recording medium. The guide guides the recording medium bearing the toner image from the transferor toward the fixing unit and includes a surface portion directly contacting the recording medium. The surface portion includes a material for charging the recording medium to have a polarity opposite to the polarity of a toner forming the toner image.Type: ApplicationFiled: February 28, 2013Publication date: July 11, 2013Inventors: Kazuchika SAEKI, Mitsuru TAKAHASHI, Kazuosa KUMA, Takeshi FUKAO, Tsutomu KATOH, Yoshiharu KISHI
-
Patent number: 8412089Abstract: An image forming apparatus includes an image carrier, a transferor, a fixing unit, and a guide. The image carrier carries a toner image. The transferor opposes the image carrier to form a transfer nip and transfers the toner image on the image carrier onto a recording medium at the transfer nip. The fixing unit fixes the toner image on the recording medium. The guide guides the recording medium bearing the toner image from the transferor toward the fixing unit and includes a surface portion directly contacting the recording medium. The surface portion includes a material for charging the recording medium to have a polarity opposite to the polarity of a toner forming the toner image.Type: GrantFiled: January 7, 2011Date of Patent: April 2, 2013Assignee: Ricoh Company, Ltd.Inventors: Kazuchika Saeki, Mitsuru Takahashi, Kazuosa Kuma, Takeshi Fukao, Tsutomu Kato, Yoshiharu Kishi
-
Patent number: 8139968Abstract: An image forming apparatus includes an image forming mechanism, a transfer mechanism including a first endless belt receiving a toner image formed on an image carrier and a second endless belt receiving the toner image formed on the first endless belt, a first detector to detect a speed of movement of the first endless belt or a toner image transferred at a predetermined position on the first endless belt, a belt speed adjustment unit to adjust a speed of movement of the first endless belt based on results obtained by the first detector, a second detector to detect the toner image transferred at a predetermined position on the second endless belt, and a transfer adjustment unit to adjust a speed of movement of the second endless belt based on results obtained by the second detector.Type: GrantFiled: June 19, 2009Date of Patent: March 20, 2012Assignee: Ricoh Company, Ltd.Inventors: Tsutomu Katoh, Kazuosa Kuma, Takeshi Fukao, Yoshiharu Kishi
-
Publication number: 20110103862Abstract: An image forming apparatus includes an image carrier, a transferor, a fixing unit, and a guide. The image carrier carries a toner image. The transferor opposes the image carrier to form a transfer nip and transfers the toner image on the image carrier onto a recording medium at the transfer nip. The fixing unit fixes the toner image on the recording medium. The guide guides the recording medium bearing the toner image from the transferor toward the fixing unit and includes a surface portion directly contacting the recording medium. The surface portion includes a material for charging the recording medium to have a polarity opposite to the polarity of a toner forming the toner image.Type: ApplicationFiled: January 7, 2011Publication date: May 5, 2011Inventors: Kazuchika SAEKI, Mitsuru Takahashi, Kazuosa Kuma, Takeshi Fukao, Tsutomu Kato, Yoshiharu Kishi
-
Patent number: 7899386Abstract: An image forming apparatus includes an image carrier, a transferor, a fixing unit, and a guide. The image carrier carries a toner image. The transferor opposes the image carrier to form a transfer nip and transfers the toner image on the image carrier onto a recording medium at the transfer nip. The fixing unit fixes the toner image on the recording medium. The guide guides the recording medium bearing the toner image from the transferor toward the fixing unit and includes a surface portion directly contacting the recording medium. The surface portion includes a material for charging the recording medium to have a polarity opposite to the polarity of a toner forming the toner image.Type: GrantFiled: October 27, 2006Date of Patent: March 1, 2011Assignee: Ricoh Co., Ltd.Inventors: Kazuchika Saeki, Mitsuru Takahashi, Kazuosa Kuma, Takeshi Fukao, Tsutomu Katoh, Yoshiharu Kishi
-
Patent number: 7885588Abstract: An image forming apparatus includes a plurality of image carriers and a transfer assembly. The transfer assembly includes a plurality of transferees, a supporter, and a plurality of transferee holders. The plurality of transferers is each configured to electrostatically transfer a toner image carried on one of the image carriers onto an intermediate transfer member or a recording medium. The supporter is configured to support the transferers. The transferer holders are each configured to hold one of the transferers. Each of the transferee holders and the transferer held thereby form an integrated individual unit independently attachable to and detachable from the supporter.Type: GrantFiled: November 21, 2007Date of Patent: February 8, 2011Assignee: Ricoh Company LimitedInventors: Tsutomu Katoh, Kazuosa Kuma, Takeshi Fukao, Yoshiharu Kishi
-
Patent number: 7848692Abstract: A neutralization unit for use in an image forming apparatus includes a support member made of an insulating material, an electric-charge removing member made of an electric conductive material, and a rib made of an insulating material. The electric-charge removing member, fixed on the support member, removes electric charge from a back face of the recording medium after a toner image is transferred to a front face of a recording medium at a transfer nip. The electric-charge removing member includes a plurality of exposed areas along a longitudinal direction of the electric-charge removing member. The rib, provided on the support member, has a curved peripheral side and protrudes from a surface of the electric-charge removing member. The back face of the recording medium is contactable at the curved peripheral side of the rib when the recording medium is transported from the transfer nip.Type: GrantFiled: June 21, 2006Date of Patent: December 7, 2010Assignee: Ricoh Co., Ltd.Inventors: Kazuchika Saeki, Mitsuru Takahashi, Tsutomu Katoh, Takeshi Fukao, Yoshiharu Kishi, Kazuosa Kuma
-
Patent number: 7706735Abstract: A lubricant applying device includes a solid lubricant and a roller brush that rotates while in contact with the lubricant, receives the lubricant, and applies the lubricant to an image carrier. A corner portion of the lubricant on an upstream side with respect to direction of rotation of the roller brush is convex, i.e., blunt.Type: GrantFiled: December 3, 2007Date of Patent: April 27, 2010Assignee: Ricoh Company, LimitedInventor: Yoshiharu Kishi
-
Publication number: 20090317104Abstract: An image forming apparatus includes an image forming mechanism, a transfer mechanism including a first endless belt receiving a toner image formed on an image carrier and a second endless belt receiving the toner image formed on the first endless belt, a first detector to detect a speed of movement of the first endless belt or a toner image transferred at a predetermined position on the first endless belt, a belt speed adjustment unit to adjust a speed of movement of the first endless belt based on results obtained by the first detector, a second detector to detect the toner image transferred at a predetermined position on the second endless belt, and a transfer adjustment unit to adjust a speed of movement of the second endless belt based on results obtained by the second detector.Type: ApplicationFiled: June 19, 2009Publication date: December 24, 2009Inventors: Tsutomu Katoh, Kazuosa Kuma, Takeshi Fukao, Yoshiharu Kishi
-
Patent number: 7509073Abstract: An image forming apparatus includes an image forming mechanism for forming an image, at least one guide member arranged in parallel, and a belt unit to be inserted into and removed from the image forming apparatus. The belt unit includes a belt, at least two rotating supports, a supporting frame, a cover, and at least one guided member. The belt is formed in an endless belt shape and transfers the image formed by the image forming mechanism. The belt is looped over the rotating supports which are rotatably supported by the supporting frame. The cover covers an outer circumferential surface of the belt. The guided member is disposed on an outer surface of the cover, engages with the guide member, and is slidably moved along the guide member when the belt unit is inserted into and removed from the image forming apparatus.Type: GrantFiled: March 17, 2006Date of Patent: March 24, 2009Assignee: Ricoh Co., Ltd.Inventors: Tsutomu Katoh, Mitsuru Takahashi, Kazuchika Saeki, Kazuosa Kuma, Takeshi Fukao, Yoshiharu Kishi
-
Patent number: 7499665Abstract: One end of a rotational shaft of a supporting rotational body attached with a rotational member is rotatably supported. The rotational member is sandwiched by a supporting frame that rotatably supports supporting rotational bodies spanned with an annular belt and fixing members fixed to the supporting frame. Thus, the one end of the rotational shaft is supported by the supporting frame and the fixing members at, at least two points. A mark detector is fixed to the fixing members, and the fixing members are fixed to the supporting frame at, at least two points. Accordingly, erroneous detection of a rotational angular speed or a rotational angular displacement of a supporting rotational body due to vibration of the supporting rotational body can be suppressed.Type: GrantFiled: February 17, 2006Date of Patent: March 3, 2009Assignee: Ricoh Company, Ltd.Inventors: Kazuosa Kuma, Mitsuru Takahashi, Kazuchika Saeki, Tsutomu Katoh, Takeshi Fukao, Yoshiharu Kishi
-
Publication number: 20080175619Abstract: An image forming apparatus includes a plurality of image carriers and a transfer assembly. The transfer assembly includes a plurality of transferees, a supporter, and a plurality of transferee holders. The plurality of transferers is each configured to electrostatically transfer a toner image carried on one of the image carriers onto an intermediate transfer member or a recording medium. The supporter is configured to support the transferers. The transferer holders are each configured to hold one of the transferers. Each of the transferee holders and the transferer held thereby form an integrated individual unit independently attachable to and detachable from the supporter.Type: ApplicationFiled: November 21, 2007Publication date: July 24, 2008Inventors: Tsutomu KATOH, Kazuosa Kuma, Takeshi Fukao, Yoshiharu Kishi
-
Publication number: 20080145102Abstract: A surface moving body includes an endless surface that is capable of making an endless movement. A surface-moving-body drive mechanism includes a driving source of a driving force for moving the surface moving body and a drive transmission mechanism for transmitting the driving force from the driving source to the surface moving body. At least a part of the surface-moving-body drive mechanism is arranged in a surface-moving-body occupying space surrounded by two surfaces defined by ends of the endless surface in a width direction orthogonal to a surface moving direction of the endless surface and the endless surface.Type: ApplicationFiled: December 12, 2007Publication date: June 19, 2008Inventors: Tsutomu Katoh, Mitsuru Takahashi, Nobuto Yokokawa, Kazuosa Kuma, Takeshi Fukao, Yoshihiro Fujiwara, Yoshiharu Kishi
-
Publication number: 20080131180Abstract: A lubricant applying device includes a solid lubricant and a roller brush that rotates while in contact with the lubricant, receives the lubricant, and applies the lubricant to an image carrier. A corner portion of the lubricant on an upstream side with respect to direction of rotation of the roller brush is convex, i.e., blunt.Type: ApplicationFiled: December 3, 2007Publication date: June 5, 2008Inventor: Yoshiharu KISHI