Patents by Inventor Fumihito Itoh
Fumihito Itoh 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).
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Patent number: 9360826Abstract: An image forming apparatus includes an image bearer; a toner image forming unit to form a toner image on the image bearer; a transfer device to transfer the toner image from the image bearer onto a transfer medium; a cleaning device to remove untransferred toner from the image bearer; and a lubrication device including a solid lubricant, an applicator to apply lubricant scraped off from the solid lubricant to the image bearer while rotating, and an applicator driving device to rotate the applicator; and a controller to control the applicator driving device according to a predetermined variable to change a rotational frequency of the applicator during idle running of the image bearer.Type: GrantFiled: November 20, 2014Date of Patent: June 7, 2016Assignee: RICOH COMPANY, LTD.Inventors: Tomohiko Saito, Fumihito Itoh, Toshiya Sato, Norio Kudoh, Hiroyuki Uenishi
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Patent number: 9158266Abstract: A waste toner conveying device for conveying waste toner removed from an image carrier to a waste toner container includes a waste toner conveying path including at least a falling and conveying path for letting the waste toner fall under its own weight; a toner bridging prevention member configured to move in the falling and conveying path to prevent bridging of the waste toner; a drive source configured to drive the toner bridging prevention member; a drive transfer member configured to transfer a driving force from the drive source to the toner bridging prevention member; and a toner adhesion prevention member configured to prevent the waste toner from adhering to the drive transfer member.Type: GrantFiled: December 16, 2013Date of Patent: October 13, 2015Assignee: Ricoh Company, LimitedInventors: Atsushi Satoh, Fumihito Itoh, Tomohiko Saito, Takamichi Orikasa
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Patent number: 9152073Abstract: A charging device includes a discharge electrode configured to charge a surface of an image carrier; a charging device body including an opening portion that is provided so as to surround the discharge electrode and be opposed to a surface of the image carrier across a longitudinal direction of the discharge electrode; a charging duct member that is provided so as to surround at least the entire opening portion and configured to introduce and exhaust an airflow within the surrounded area; an intake unit configured to generate an airflow to be guided into the charging duct member; and an exhaust unit configured to exhaust the airflow guided. The charging duct member includes an airflow wall forming unit for covering, with an airflow wall, the entire opening portion from an upstream end to a downstream end in a rotation direction of the image carrier at the opening portion.Type: GrantFiled: September 12, 2013Date of Patent: October 6, 2015Assignee: Ricoh Company, LimitedInventors: Takamichi Orikasa, Fumihito Itoh, Tomohiko Saito, Atsushi Satoh
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Patent number: 9098049Abstract: A cleaning device, which is included in a process cartridge or an image forming apparatus, includes a cleaning member including a brush rotary body that is disposed in contact with an image carrier provided in an image forming apparatus and that removes toner on the image carrier and holds the toner thereon, a toner conveying rotary body to collect and convey the toner removed by the cleaning member, a flicker contacting the cleaning member to flick off the toner held on the cleaning member, and an agitator that has a free end contacting the toner conveying rotary body and vibrating due to rotation of the toner conveying rotary body. The agitator further has a trajectory being formed between the opening and the toner conveying rotary body by movement of the free end. Alternatively, the free end of the agitator is disposed facing the flicker.Type: GrantFiled: August 6, 2014Date of Patent: August 4, 2015Assignee: Ricoh Company, Ltd.Inventors: Akira Asaoka, Toshiya Sato, Norio Kudoh, Hiroyuki Uenishi, Fumihito Itoh
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Publication number: 20150160600Abstract: An image forming apparatus includes an image bearer; a toner image forming unit to form a toner image on the image bearer; a transfer device to transfer the toner image from the image bearer onto a transfer medium; a cleaning device to remove untransferred toner from the image bearer; and a lubrication device including a solid lubricant, an applicator to apply lubricant scraped off from the solid lubricant to the image bearer while rotating, and an applicator driving device to rotate the applicator; and a controller to control the applicator driving device according to a predetermined variable to change a rotational frequency of the applicator during idle running of the image bearer.Type: ApplicationFiled: November 20, 2014Publication date: June 11, 2015Applicant: RICOH COMPANY, LTD.Inventors: Tomohiko SAITO, Fumihito ITOH, Toshiya SATO, Norio KUDOH, Hiroyuki UENISHI
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Publication number: 20150063887Abstract: A cleaning device, which is included in a process cartridge or an image forming apparatus, includes a cleaning member including a brush rotary body that is disposed in contact with an image carrier provided in an image forming apparatus and that removes toner on the image carrier and holds the toner thereon, a toner conveying rotary body to collect and convey the toner removed by the cleaning member, a flicker contacting the cleaning member to flick off the toner held on the cleaning member, and an agitator that has a free end contacting the toner conveying rotary body and vibrating due to rotation of the toner conveying rotary body. The agitator further has a trajectory being formed between the opening and the toner conveying rotary body by movement of the free end. Alternatively, the free end of the agitator is disposed facing the flicker.Type: ApplicationFiled: August 6, 2014Publication date: March 5, 2015Applicant: RICOH COMPANY, LTD.Inventors: Akira ASAOKA, Toshiya SATO, Norio KUDOH, Hiroyuki UENISHI, Fumihito ITOH
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Publication number: 20140169852Abstract: A waste toner conveying device for conveying waste toner removed from an image carrier to a waste toner container includes a waste toner conveying path including at least a falling and conveying path for letting the waste toner fall under its own weight; a toner bridging prevention member configured to move in the falling and conveying path to prevent bridging of the waste toner; a drive source configured to drive the toner bridging prevention member; a drive transfer member configured to transfer a driving force from the drive source to the toner bridging prevention member; and a toner adhesion prevention member configured to prevent the waste toner from adhering to the drive transfer member.Type: ApplicationFiled: December 16, 2013Publication date: June 19, 2014Applicant: RICOH COMPANY, LIMITEDInventors: Atsushi SATOH, Fumihito ITOH, Tomohiko SAITO, Takamichi ORIKASA
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Publication number: 20140079431Abstract: A charging device includes a discharge electrode configured to charge a surface of an image carrier; a charging device body including an opening portion that is provided so as to surround the discharge electrode and be opposed to a surface of the image carrier across a longitudinal direction of the discharge electrode; a charging duct member that is provided so as to surround at least the entire opening portion and configured to introduce and exhaust an airflow within the surrounded area; an intake unit configured to generate an airflow to be guided into the charging duct member; and an exhaust unit configured to exhaust the airflow guided. The charging duct member includes an airflow wall forming unit for covering, with an airflow wall, the entire opening portion from an upstream end to a downstream end in a rotation direction of the image carrier at the opening portion.Type: ApplicationFiled: September 12, 2013Publication date: March 20, 2014Applicant: RICOH COMPANY, LIMITEDInventors: Takamichi ORIKASA, Fumihito ITOH, Tomohiko SAITO, Atsushi SATOH
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Patent number: 8655254Abstract: A lubricant applicator includes: a lubricant application unit that is arranged so as to be in contact with a surface of an image carrier, scrapes a solid lubricant, and applies the solid lubricant onto the surface of the image carrier while moving a surface of the lubricant application unit; a lubricant holding member that holds the solid lubricant; and a lubricant biasing unit that biases the solid lubricant against the lubricant application unit. The lubricant biasing unit is housed in a housing under a state that one end of the lubricant biasing unit is held by the lubricant holding member so that a position of the one end of the lubricant biasing unit is restricted, and another end of the lubricant biasing unit is held by a biasing-unit holding member that is provided to restrict a position of the another end of the lubricant biasing unit.Type: GrantFiled: September 16, 2010Date of Patent: February 18, 2014Assignee: Ricoh Company, LimitedInventors: Yuji Arai, Ken Amemiya, Toshio Koike, Michiya Okamoto, Takuma Iwasaki, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Masahiko Shakuto, Kaoru Yoshino, Satoshi Hatori, Yuta Azeyanagi
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Patent number: 8565661Abstract: A cleaning device that can be incorporated in an image forming apparatus which includes an image carrier configured to form a toner image, and a cleaning device configured to clean residual toner on the surface of the image carrier. The cleaning device includes a cleaning blade having a blade member provided to contact the surface of the image carrier and a holder to hold the blade member. The cleaning device further includes a frame to hold the cleaning blade and a vibration suppression member provided across the cleaning blade and the frame to couple the cleaning blade and the frame together and suppress vibration.Type: GrantFiled: September 21, 2009Date of Patent: October 22, 2013Assignee: Ricoh Company, Ltd.Inventors: Michiya Okamoto, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Ken Amemiya, Masahiko Shakuto, Toshio Koike, Yuji Arai, Kaoru Yoshino, Takuma Iwasaki
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Patent number: 8391732Abstract: An image forming device includes: a collecting container that collects a waste toner; a rotation member that rotates and spreads a waste toner inside the collecting container; a torque detection unit that detects torque applied to the rotation member by a waste toner inside the collecting container; and a rotation direction switching unit that switches a rotation direction of the rotation member. When a torque value detected by the torque detection unit is more than a first threshold, the rotation direction of the rotation member is switched by the rotation direction switching unit.Type: GrantFiled: August 4, 2010Date of Patent: March 5, 2013Assignee: Ricoh Company, LimitedInventors: Kenji Honjoh, Fumihito Itoh, Masahiko Shakuto, Kaoru Yoshino, Takuma Iwasaki
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Patent number: 8369770Abstract: A collection container for collecting and containing waste toner includes a leveling member, a detector, and at least one inlet. The leveling member levels the waste toner contained in the collection container. The detector detects an amount of the waste toner contained in the collection container. The leveling member levels the waste toner delivered to the collection container through the at least one inlet by conveying the waste toner simultaneously in a first direction toward the detector and a second direction opposite to the first direction, starting from an origination position corresponding to the at least one inlet.Type: GrantFiled: August 31, 2009Date of Patent: February 5, 2013Assignee: Ricoh Company, Ltd.Inventors: Michiya Okamoto, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Ken Amemiya, Masahiko Shakuto, Toshio Koike, Yuji Arai, Kaoru Yoshino, Takuma Iwasaki
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Patent number: 8204423Abstract: Described embodiments include apparatuses and processes for cleaning a surface of a rotatable image carrier including a cleaning unit configured to prevent material from accumulating on a cleaning blade.Type: GrantFiled: January 8, 2009Date of Patent: June 19, 2012Assignee: Ricoh Company, Ltd.Inventors: Satoshi Hatori, Takaya Muraishi, Takeshi Shintani, Yasushi Akiba, Akio Kosuge, Kaoru Yoshino, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Nobuo Kuwabara
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Patent number: 8090293Abstract: A process cartridge detachably attached to an image forming apparatus includes a first subunit, a second subunit, a first positioning member, and a second positioning member. The first subunit accommodates a photoconductor therein. The second subunit accommodates a developer applicator therein. The photoconductor and the developer applicator are arranged substantially parallel to each other to define a development gap therebetween. The first positioning member is fastened to both the first and second subunits to position ends of the photoconductor and the developer applicator on a first side of the respective subunits. The second positioning member is fastened to only one of the first and second subunits to position ends of the photoconductor and the developer applicator on a second side of the respective subunits opposite to the first side. An image forming apparatus employing such a process cartridge is also disclosed.Type: GrantFiled: August 10, 2009Date of Patent: January 3, 2012Assignee: Ricoh Company, Ltd.Inventors: Yuji Arai, Hiroyuki Nagashima, Nobuo Kuwabara, Fumihito Itoh, Hiroshi Ono, Ken Amemiya, Masahiko Shakuto, Toshio Koike, Michiya Okamoto, Tomokazu Mochizuki, Masayuki Yamane, Takeshi Uchitani, Eisuke Hori, Hideki Kimura
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Patent number: 8041280Abstract: A lubricant applying unit has a residual-toner collection rate X of 50% when the lubricant applying unit has not been used. The collection rate X is obtained by X=(Ta?Tb)/Ta×100, where Ta is weight per unit area of the residual toner on an area of the image carrier that has not come into contact with the lubricant applying unit, and Tb is weight per unit area of the residual toner on an area of the image carrier that has come into contact with the lubricant applying unit.Type: GrantFiled: March 20, 2009Date of Patent: October 18, 2011Assignee: Ricoh Company, Ltd.Inventors: Toshio Koike, Hiroyuki Nagashima, Nobuo Kuwabara, Fumihito Itoh, Masahiko Shakuto, Ken Amemiya, Yuji Arai, Michiya Okamoto, Hiroshi Ono
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Patent number: 7953363Abstract: A lubricant applicator includes a solid mold lubricant, a lubricant application roller, and a flicker member. The lubricant application roller scrapes and applies the lubricant to an image bearing member. The flicker member removes a powder substance adhered to the surface of the lubricant application roller and is disposed upstream of the solid mold lubricant in a direction of rotation of the lubricant application roller. The lubricant application roller, the flicker member, and the solid mold lubricant define a sealed space therebetween. A lubricant applicator includes the solid mold lubricant, the lubricant application roller, the flicker member, and an adherence prevention member that prevents the substance removed by the flicker member from adhering again to the lubricant application roller. A lubricant applicator includes the solid mold lubricant, the lubricant application roller, and a lubricant receiver that receives the scraped lubricant from the lubricant application roller.Type: GrantFiled: October 1, 2009Date of Patent: May 31, 2011Assignee: Ricoh Company, Ltd.Inventors: Kenji Honjoh, Toshiya Satoh, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Ken Amemiya, Masahiko Shakuto, Toshio Koike, Yuji Arai, Nobuo Kuwabara, Michiya Okamoto
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Publication number: 20110076075Abstract: A lubricant applicator includes: a lubricant application unit that is arranged so as to be in contact with a surface of an image carrier, scrapes a solid lubricant, and applies the solid lubricant onto the surface of the image carrier while moving a surface of the lubricant application unit; a lubricant holding member that holds the solid lubricant; and a lubricant biasing unit that biases the solid lubricant against the lubricant application unit. The lubricant biasing unit is housed in a housing under a state that one end of the lubricant biasing unit is held by the lubricant holding member so that a position of the one end of the lubricant biasing unit is restricted, and another end of the lubricant biasing unit is held by a biasing-unit holding member that is provided to restrict a position of the another end of the lubricant biasing unit.Type: ApplicationFiled: September 16, 2010Publication date: March 31, 2011Inventors: Yuji Arai, Ken Amemiya, Toshio Koike, Michiya Okamoto, Takuma Iwasaki, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Masahiko Shakuto, Kaoru Yoshino, Satoshi Hatori, Yuta Azeyanagi
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Publication number: 20110052225Abstract: An image forming device includes: a collecting container that collects a waste toner; a rotation member that rotates and spreads a waste toner inside the collecting container; a torque detection unit that detects torque applied to the rotation member by a waste toner inside the collecting container; and a rotation direction switching unit that switches a rotation direction of the rotation member. When a torque value detected by the torque detection unit is more than a first threshold, the rotation direction of the rotation member is switched by the rotation direction switching unit.Type: ApplicationFiled: August 4, 2010Publication date: March 3, 2011Inventors: Kenji Honjoh, Fumihito Itoh, Masahiko Shakuto, Kaoru Yoshino, Takuma Iwasaki
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Patent number: 7869746Abstract: In an image forming device including an image support object which supports an electrostatic latent image, and a developing device which turns the electrostatic latent image formed on the surface of the image support object, into a visible image with toner, a powder storing unit stores powder for image formation which is either a developing agent containing a toner and a carrier or a toner. A powder supplying unit supplies the powder stored in the powder storing unit, to the developing device. The powder storing unit includes a gas supplying unit which blows off a gas from an exhaust outlet of the gas supplying unit into the powder storing unit, and a powder passage which allows the powder storing unit to communicate with the developing device.Type: GrantFiled: March 7, 2007Date of Patent: January 11, 2011Assignee: Ricoh Company, Ltd.Inventors: Fumihito Itoh, Hirosato Amano, Kazuhisa Sudo
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Patent number: 7826778Abstract: In a powder supplying device, a powder container contains powder therein and is provided at a bottom of the powder container with a gas blowout part for ejecting gas to the inside of the powder container. A powder transport unit attracts powder contained in the powder container from a suction opening and transports the powder to a powder receiving device. A first detection unit is provided in the powder container to detect a remaining powder in the powder container.Type: GrantFiled: January 29, 2007Date of Patent: November 2, 2010Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Sano, Hirosato Amano, Keizo Chiba, Hiroshi Tateishi, Tetsuo Noji, Kazuhisa Sudo, Fumihito Itoh