Patents by Inventor Toshio Koike

Toshio Koike 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).

  • Publication number: 20130209143
    Abstract: A developing device including: a toner bearing member configured to bear a toner on a surface of the toner bearing member and configured such that the surface thereof is rotated to supply the toner to and develop a latent electrostatic image on a surface of a latent electrostatic image bearing member in a developing region which faces the latent electrostatic image bearing member; and a regulating member configured to regulate an amount of the toner to be moved towards the developing region, wherein the surface of the toner bearing member has regularly arranged convex portions, and wherein a non-electrostatic adhesive force between the toner and the surface of the toner bearing member is less than 9.0 nN.
    Type: Application
    Filed: February 6, 2013
    Publication date: August 15, 2013
    Inventors: Osamu ENDOU, Yasuyuki ISHII, Yoshiko OGAWA, Yuuji ISHIKURA, Hideyasu SEKI, Toshio KOIKE, Akihiro KAWAKAMI
  • Patent number: 8494428
    Abstract: A lubricant applicator includes a lubricant and a rotatable lubricant application member. The rotatable lubricant application member contacts the lubricant and an application target to apply the lubricant to the application target while rotating. The lubricant application member includes a core member, a first wound portion including a bristle member wound spirally around the periphery of the core member in a first direction, and a second wound portion including a bristle member wound spirally around the periphery of the core member in a second direction opposite the first direction in an axial direction of the core member. A process unit includes the lubricant applicator. A transfer device includes the lubricant applicator. An image forming apparatus includes at least one of the process unit and the transfer device and the lubricant applicator.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: July 23, 2013
    Assignee: Ricoh Company, Ltd
    Inventors: Yuta Azeyanagi, Ken Amemiya, Satoshi Hatori, Toshio Koike, Yuji Arai, Michiya Okamoto, Takuma Iwasaki, Akira Fujimori, Kaoru Yoshino, Takaaki Tawada, Takatsugu Fujishiro
  • Patent number: 8428488
    Abstract: A cleaning roller cleaning a surface of a cleaning component, wherein the cleaning roller is provided in a roller configuration having a cylindrical shape and has a portion in contact with the cleaning component, the portion being made of a melamine resin foam having a continuous foam structure, the melamine resin foam being provided by heating compression from an original configuration in a radial direction, and wherein the portion in contact with the cleaning component has a continuous foam structure and a tensile strength in a range of 1.7±0.5 kg/cm2, and an image forming apparatus incorporating the same.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: April 23, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruji Mizuishi, Tokuya Ojimi, Toshio Koike, Takeshi Shintani, Yuji Arai, Takuzi Yoneda, Ken Amemiya, Takaaki Tawada, Masami Tomita, Masanori Kawasumi, Takaya Muraishi, Hiroomi Harada, Hiromichi Ninomiya
  • Patent number: 8396408
    Abstract: A cleaning device includes a cleaning blade configured to clean a surface of a rotating subject, a solid lubricant configured to reduce the friction coefficient of the surface of the subject, and a lubricant coating device that includes a coating roller to shave the solid lubricant during normal rotation and a reverse rotation to coat the surface of the subject with the lubricant. The amount of lubricant supplied to the subject during normal rotation of the coating roller is different from a supply amount of the lubricant during reverse rotation of the coating roller, with more lubricant supplied during reverse rotation than during normal rotation.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: March 12, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Ken Amemiya, Satoshi Hatori, Toshio Koike, Yuji Arai, Takuma Iwasaki, Shinya Karasawa, Yuta Azeyanagi
  • Patent number: 8382421
    Abstract: A compact transport apparatus that does not cause pollution to its environment is provided. In a transport apparatus according to a first aspect of the present invention, an installation area of the apparatus is small because first and second rotary shafts are arranged concentrically, and a dead center escaping mechanism has a simple structure with a small thickness. Since a connecting portion of a hand portion can be made thin, an opening of a gate valve through which the hand portion is inserted can be reduced. As a result, it becomes difficult for dust inside a transport chamber to enter a processing chamber. A second aspect of the present invention is directed to a spaced dual shaft-type transport apparatus.
    Type: Grant
    Filed: September 22, 2009
    Date of Patent: February 26, 2013
    Assignee: Ulvac, Inc.
    Inventors: Kazuhiro Musha, Hirofumi Minami, Kenji Ago, Takashi Asaishi, Toshio Koike
  • Publication number: 20130034368
    Abstract: A development device includes a development casing for containing two-component developer, a developer bearer, a developer regulator to adjust an amount of developer carried on the developer bearer, a first developer conveyance member to supply developer to the developer bearer, a second developer conveyance member to transport axially developer separated from the developer bearer, first and second conveyance channels divided by a partition, in which the first and second developer conveyance members are respectively provided, and a removable sheet member to cover the developer bearer in an area facing the developer regulator, the first and second conveyance channels, and the partition. A first end portion of the sheet member extends from the second conveyance channel outside the development casing through a through hole formed in the development casing, and a second end portion thereof is retained by a retainer at a position outside the developer regulator.
    Type: Application
    Filed: July 23, 2012
    Publication date: February 7, 2013
    Applicant: Ricoh Company, Ltd.
    Inventors: Yoshio Hattori, Toshio Koike, Hiroaki Okamoto, Atsushi Nakamoto, Yoshiyuki Fukuda
  • Patent number: 8369770
    Abstract: 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: Grant
    Filed: August 31, 2009
    Date of Patent: February 5, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Michiya Okamoto, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Ken Amemiya, Masahiko Shakuto, Toshio Koike, Yuji Arai, Kaoru Yoshino, Takuma Iwasaki
  • Publication number: 20120219326
    Abstract: A development device includes a developer container, a developer bearer to carry developer to a development range, a partition dividing at least partly the developer container into a supply compartment and a collecting compartment, with an end portion of the partition facing a circumferential surface of the developer bearer, a developer supply member in the supply compartment to supply the developer to the developer bearer, and a developer collecting member in the collecting compartment above the developer supply member, to receive the developer from the developer bearer. An opening is formed in a downstream end portion of the partition in a developer conveyance direction of the developer collecting member to cause the developer to fall to the supply compartment, and a width of the opening in a direction perpendicular to the axial direction increases toward downstream in the developer conveyance direction of the developer collecting member.
    Type: Application
    Filed: January 26, 2012
    Publication date: August 30, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Toshio Koike, Yoshiyuki Fukuda, Yoshio Hattori, Atsushi Nakamoto, Hiroaki Okamoto
  • Patent number: 8254823
    Abstract: A waste toner storage unit detachably mountable to an image forming apparatus includes a waste toner container and an inner cover integrally attached to the waste toner container. The waste toner container stores waste toner recovered after an image forming process. The inner cover is located at a region of the waste toner storage unit that does not store waste toner.
    Type: Grant
    Filed: October 13, 2008
    Date of Patent: August 28, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyuki Nagashima, Shuji Tanaka, Nobuo Kuwabara, Hiroshi Ono, Ken Amemiya, Masahiko Shakuto, Toshio Koike, Yuji Arai, Michiya Okamoto, Kenji Honjoh
  • Publication number: 20120163874
    Abstract: Developing devices, process cartridges and image-forming apparatuses, having a chamber for conveying recovered developer on the top of another chamber for conveying supplying developer, where the developer is conveyed by screws inside the chambers respectively, when mixing and conveying the developing agent, a shielding member which separates the chambers, a guide section is provided in the shielding member to guide a developing agent which has left a developing roller toward the screw in the upper chamber, and a third communication section is provided next to the guide section, at the back of where the guided developer contacts the screw wings in the upper chamber, and the third communication section communicates the chambers with each other, and the third communication section is provided from center to downstream in the conveyance direction of the developer by the screw upper.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 28, 2012
    Inventors: Yoshio Hattori, Atsushi Nakamoto, Yoshiyuki Fukuda, Toshio Koike, Hiroaki Okamoto
  • Patent number: 8185032
    Abstract: A used toner conveyance device includes a lateral conveyance member for conveying used toner substantially in the horizontal direction, and a vertical conveyance member for upwardly conveying the used toner transferred from the lateral conveyance member. The vertical conveyance member transfers the used toner to either a collection space or a next conveyance path. The vertical conveyance member stops its operation when a prescribed delay time has elapsed after the lateral conveyance member stops conveyance operation.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: May 22, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Hiroshi Ono, Tokuya Ojimi, Shuji Tanaka, Ken Amemiya, Toshio Koike, Yuji Arai, Michiya Okamoto, Hiroyuki Nagashima, Nobuo Kuwabara, Masahiko Shakuto
  • Patent number: 8090293
    Abstract: 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: Grant
    Filed: August 10, 2009
    Date of Patent: January 3, 2012
    Assignee: 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
  • Publication number: 20110274447
    Abstract: A process unit including a first housing detachably attachable to an image forming apparatus, an image carrier to carry an image on a surface thereof, a charger to charge the surface of the image carrier, a developing device to form the image on the surface of the image carrier, a cleaning device to remove toner from the surface of the image carrier, a lubricant to be supplied to the surface of the image carrier, a lubricant container to contain the lubricant, and a waste toner container to store the toner removed from the surface of the image carrier. The first housing includes the image carrier and at least one of the charger, the developing device, and the cleaning device. The lubricant, the lubricant container, and the waste toner container together are detachably attachable to the first housing.
    Type: Application
    Filed: April 15, 2011
    Publication date: November 10, 2011
    Inventors: Yuji Arai, Satoshi Hatori, Toshio Koike, Yuta Azeyanagi, Kenji Honjoh
  • 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: 20110262179
    Abstract: A cleaning roller cleaning a surface of a cleaning component, wherein the cleaning roller is provided in a roller configuration having a cylindrical shape and has a portion in contact with the cleaning component, the portion being made of a melamine resin foam having a continuous foam structure, the melamine resin foam being provided by heating compression from an original configuration in a radial direction, and wherein the portion in contact with the cleaning component has a continuous foam structure and a tensile strength in a range of 1.7±0.5 kg/cm2, and an image forming apparatus incorporating the same.
    Type: Application
    Filed: June 30, 2011
    Publication date: October 27, 2011
    Inventors: Haruji MIZUISHI, Tokuya Ojimi, Toshio Koike, Takeshi Shintani, Yuji Arai, Takuzi Yoneda, Ken Amemiya, Takaaki Tawada, Masami Tomita, Masanori Kawasumi, Takaya Muraishi, Hiroomi Harada, Hiromichi Ninomiya
  • Patent number: 8041280
    Abstract: 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: Grant
    Filed: March 20, 2009
    Date of Patent: October 18, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshio Koike, Hiroyuki Nagashima, Nobuo Kuwabara, Fumihito Itoh, Masahiko Shakuto, Ken Amemiya, Yuji Arai, Michiya Okamoto, Hiroshi Ono
  • Publication number: 20110217101
    Abstract: A lubricant applying device includes a solid lubricant, and a rotatable applying member scraping lubricant off the solid lubricant and applying the scraped lubricant onto an application subject. In the lubricant applying device, a pressing unit applies that applies an applying pressure of pressing the solid lubricant against the applying member and that varies the applying pressure in accordance with a rotation speed of the applying member.
    Type: Application
    Filed: February 16, 2011
    Publication date: September 8, 2011
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Michiya Okamoto, Ken Amemiya, Shinya Karasawa, Takuma Iwasaki, Satoshi Hatori, Toshio Koike, Yuji Arai, Yuta Azeyanagi
  • Patent number: 8000627
    Abstract: The present invention provides a charging device which comprises a charging roller (14a) and a cleaning component (14b). The charging roller charges a surface of an image-recording medium (11) with a voltage which is applied from an external source. The cleaning component cleans a surface of the charging roller. The charging roller includes a resistance adjustment layer which is made of a resin composite and formed on an outer periphery of a core metal. The hardness of the charging roller is 45 degrees or more in JIS D hardness. The cleaning component has a portion which is in contact with the charging roller. This portion is made of resin foam which has a continuous foam structure. The density of the resin foam is 5 to 15 kg/m3 and its tensile strength is 1.7±0.5 kg/cm2.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: August 16, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruji Mizuishi, Tokuya Ojimi, Toshio Koike, Takeshi Shintani, Yuji Arai, Takuzi Yoneda, Ken Amemiya, Takaaki Tawada, Masami Tomita, Masanori Kawasumi, Takaya Muraishi, Hiroomi Harada, Hiromichi Ninomiya
  • Patent number: 7953363
    Abstract: 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: Grant
    Filed: October 1, 2009
    Date of Patent: May 31, 2011
    Assignee: 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
  • Publication number: 20110123239
    Abstract: A lubricant applicator includes a lubricant and a rotatable lubricant application member. The rotatable lubricant application member contacts the lubricant and an application target to apply the lubricant to the application target while rotating. The lubricant application member includes a core member, a first wound portion including a bristle member wound spirally around the periphery of the core member in a first direction, and a second wound portion including a bristle member wound spirally around the periphery of the core member in a second direction opposite the first direction in an axial direction of the core member. A process unit includes the lubricant applicator. A transfer device includes the lubricant applicator. An image forming apparatus includes at least one of the process unit and the transfer device and the lubricant applicator.
    Type: Application
    Filed: November 16, 2010
    Publication date: May 26, 2011
    Inventors: Yuta Azeyanagi, Ken Amemiya, Satoshi Hatori, Toshio Koike, Yuji Arai, Michiya Okamoto, Takuma Iwasaki, Akira Fujimori, Kaoru Yoshino, Takaaki Tawada, Takatsugu Fujishiro