Patents by Inventor Hiroshi Fujiwara

Hiroshi Fujiwara 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: 20110058829
    Abstract: The sheet thickness detector includes a fixed member, a displacement roller disposed opposite the fixed member and movable in such a linear direction as to be contacted with or separated from the fixed member when the sheet passes through a nip therebetween, bearings rotatably supporting a shaft of the displacement roller, a displacement member movable in the linear direction in conjunction with the displacement roller and integrated with at least one of the bearings, and a displacement sensor operatively connected to the displacement member and detecting displacement of the displacement member. The thickness of the sheet passing through the nip is determined based on the amount of displacement of the displacement member.
    Type: Application
    Filed: August 4, 2010
    Publication date: March 10, 2011
    Inventors: Kazuyoshi Kondo, Hiroshi Fujiwara, Toshikane Nishii, Mizuna Tanaka, Tomoyoshi Yamazaki, Haruyuki Honda
  • Patent number: 7900917
    Abstract: In a recording medium conveyer, a driver drives a feeding member and a conveying member provided downstream from the feeding member in a recording medium conveyance direction independently. A controller stops driving the feeding member when a first time period elapses after a recording medium reaches the conveying member. When a selector judges that the thickness of the recording medium identifies the recording medium as thin paper, the controller does not drive the feeding member after the controller starts driving the conveying member, and when the selector judges that the recording medium has a thickness greater than a thickness of the recording medium that identifies the recording medium as thin paper, the controller restarts driving the feeding member no later than when the controller starts driving the conveying member.
    Type: Grant
    Filed: July 20, 2009
    Date of Patent: March 8, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Fujiwara, Mizuna Tanaka, Tomoyoshi Yamazaki, Toshikane Nishii, Kazuyoshi Kondo, Haruyuki Honda
  • Publication number: 20110054172
    Abstract: The present invention provides a novel pyridylaminoacetic acid compound represented by the following formula (1): (wherein R1, R2, R3, Y and Z are as defined in the description and claims), or a pharmacologically acceptable salt thereof. The pyridylaminoacetic acid compound has EP2 agonistic action and is therefore useful as a therapeutic and/or prophylactic agent for respiratory diseases such as asthma or chronic obstructive pulmonary disease.
    Type: Application
    Filed: March 12, 2009
    Publication date: March 3, 2011
    Inventors: Ryo Iwamura, Masayuki Tanaka, Tetsushi Katsube, Manabu Shigetomi, Eiji Okanari, Yasunori Tokunaga, Hiroshi Fujiwara
  • Patent number: 7878725
    Abstract: An image forming apparatus is disclosed. The image forming apparatus includes an apparatus main body, a first unit to be attached inside the apparatus main body, a rotatable part attached to the apparatus main body and rotatable between an open position for opening the apparatus main body and a closed position for closing the apparatus main body, and a second unit removably attached to the rotatable part. When the rotatable part is rotated from the closed position to the open position, the first unit is allowed to be attached to or removed from the apparatus main body by being moved horizontally. By removing the second unit from the rotatable part, the first unit is attached to or removed from the apparatus main body without coming into contact with the second unit.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: February 1, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhide Ohkubo, Hiroshi Fujiwara, Shigeo Nanno, Ippei Kimura, Yoshihide Ohta, Tomoyoshi Yamazaki, Masafumi Takahira, Haruyuki Honda
  • Publication number: 20100314827
    Abstract: A sheet transport mechanism that can be incorporated in an image forming apparatus includes a first sheet transport member, a second sheet transport member disposed downstream from the first sheet transport member in a sheet transport direction, a sheet transport path defined by and curved between the first and second sheet transport members and including a downstream section recessed from an upstream section in the sheet transport direction, and a contact member disposed at the downstream section and including a first contact portion to which the leading edge of a sheet contacts to move the contact member in a direction to recess from the sheet transport path and a second contact portion connected to the first contact portion to advance toward the sheet transport path at a position upstream from the first contact portion in the sheet transport direction to contact the surface of the sheet.
    Type: Application
    Filed: June 11, 2010
    Publication date: December 16, 2010
    Inventors: Toshikane Nishii, Hiroshi Fujiwara, Tomoyoshi Yamazaki, Haruyuki Honda, Kazuyoshi Kondo, Mizuna Tanaka
  • Publication number: 20100268753
    Abstract: A table forming unit calculates, in a weighted reproducing kernel Hilbert space formed of an absolutely continuous function that is zero at an origin, solutions of simultaneous equations obtained by discretization of an integral equation of the second kind derived from Tikhonov regularization method with a weighted square integrable space used as an observation space, and forms an H table describing information including numerical solution of the integral equation of the second kind based on the solutions of the simultaneous equations. An inverse transform unit obtains, by numerical calculation, an inner product, in the weighted square integrable space, of the numerical solution of the integral equation of the second kind and a Laplace transform image multiplied by a mollifier function with reference to the H table.
    Type: Application
    Filed: August 12, 2008
    Publication date: October 21, 2010
    Applicants: KYOTO UNIVERSITY, NATIONAL UNIVERSITY CORPORATION GUNMA UNIVERSITY
    Inventors: Hiroshi Fujiwara, Saburou Saitoh, Tsutomu Matsuura
  • Publication number: 20100221051
    Abstract: A sheet feeding device includes a sheet feed cassette, a bottom plate and an end wall mechanism. When the number of recording media sheets decreases, the bottom plate hinged at a trailing edge thereof rises about the hinged end to keep the top sheet of the recording media sheets in contact with a sheet feed roller. The end wall mechanism includes a first urging member, a first pressing member, a support member, and a second pressing member, and aligns and presses the trailing edge of the recording medium. The first pressing member urged by the first urging member and supported by the support member presses the trailing edge of the recording medium. The second pressing member urged by the second urging member moves down due to the weight of the recording medium on the second pressing member and moves up when the number of the recording media sheets decreases.
    Type: Application
    Filed: February 25, 2010
    Publication date: September 2, 2010
    Inventors: Tomoyoshi Yamazaki, Haruyuki Honda, Hiroshi Fujiwara, Kazuyoshi Kondo, Toshikane Nishii, Mizuna Tanaka
  • Publication number: 20100201059
    Abstract: An open/close mechanism can be used for paper trays of an image forming apparatus. The open/close mechanism includes a plate member provided on a side of a housing of the image forming apparatus and configured to pivot upon an axis between an open position and a close position, and a box member that is arranged in the housing beneath the plate member and that can be drawn out of the housing from the side. The open/close mechanism includes also includes a restricting unit that is coupled to the plate member and that abuts against the box member when the box member is set in the housing and when the plate member is in the open position thereby restricting detachment of the box member from the housing.
    Type: Application
    Filed: April 16, 2010
    Publication date: August 12, 2010
    Inventors: Toshikane Nishii, Kazuhiro Wakamatsu, Yasuhide Ohkubo, Ippei Kimura, Mizuna Tanaka, Haruyuki Honda, Masafumi Takahira, Hiroshi Fujiwara
  • Publication number: 20100192710
    Abstract: Plural auxiliary rotating members abut at different positions in a circumferential direction of a roller-shaped rotating member that is configured to rotate in a forward direction and a reverse direction. Diameters of a portion of the roller-shaped rotating member where a first auxiliary rotating member abuts and a portion of the roller-shaped rotating member where a second auxiliary rotating member abuts are different from each other. Conveying speeds of sheets conveyed by the first auxiliary rotating member and the second auxiliary rotating member with the roller-shaped rotating member in different directions at the same time are different from each other.
    Type: Application
    Filed: September 4, 2008
    Publication date: August 5, 2010
    Inventors: Toru Hanashima, Hiroshi Fujiwara, Haruyuki Honda, Yasuhide Ohkubo, Tatsuo Fukushima, Kimihiro Tanaka
  • Patent number: 7731182
    Abstract: A sliding mechanism includes a sheet position limiting member having a sheet position limiting surface, the sheet position limiting member being configured to slide in a direction perpendicular to the plane of the sheet position limiting surface; and a guide member configured to guide the sliding of the sheet position limiting member.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: June 8, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshikane Nishii, Hiroshi Fujiwara, Shigeo Nanno, Tomoyoshi Yamazaki, Yasuhide Ohkubo, Ippei Kimura, Masafumi Takahira
  • Patent number: 7731170
    Abstract: An open/close mechanism can be used for paper trays of an image forming apparatus. The open/close mechanism includes a plate member provided on a side of a housing of the image forming apparatus and configured to pivot upon an axis between an open position and a close position, and a box member that is arranged in the housing beneath the plate member and that can be drawn out of the housing from the side. The open/close mechanism includes also includes a restricting unit that is coupled to the plate member and that abuts against the box member when the box member is set in the housing and when the plate member is in the open position thereby restricting detachment of the box member from the housing.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: June 8, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshikane Nishii, Kazuhiro Wakamatsu, Yasuhide Ohkubo, Ippei Kimura, Mizuna Tanaka, Haruyuki Honda, Masafumi Takahira, Hiroshi Fujiwara
  • Patent number: 7677555
    Abstract: A sheet conveying apparatus includes a sheet containing unit that contains sheets; a sheet conveying unit that conveys the sheets; a separating unit that separates a single sheet from the sheets; a holding unit that holds the separating unit; and a vibration applying unit that applies a vibration to any one of the sheets conveyed by the sheet conveying unit and the separating unit before starting conveyance of the sheets.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: March 16, 2010
    Assignee: Ricoh Company, Limited
    Inventors: Mizuna Tanaka, Yasuo Matsuyama, Hiroshi Fujiwara, Tomoyoshi Yamazaki, Toshikane Nishii, Kazuyoshi Kondo, Yasuhide Ohkubo, Haruyuki Honda, Ippei Kimura, Masafumi Takahira
  • Publication number: 20100059930
    Abstract: A paper feeder includes a sheet container including a platen member on which sheet-like recording media is placed, the platen member having one end portion on an upstream side of a paper feed direction rotatably supported to a spindle, such that the other end portion on a downstream side of the paper feed direction is lifted, and a paper feed member which draws and feeds the sheet-like recording media, and the sheet container includes a stepped portion which presses down the downstream side of the paper feed direction of the platen member when inserting the sheet container in the direction opposite to the paper feed direction, and a sliding portion which maintains the pressing down.
    Type: Application
    Filed: September 8, 2009
    Publication date: March 11, 2010
    Inventors: Mizuna Tanaka, Haruyuki Honda, Hiroshi Fujiwara, Toshikane Nishii
  • Patent number: 7676176
    Abstract: An image forming apparatus includes a cover and a supporting unit. The supporting unit includes a holding member, a supporting member, a first biasing unit, and a positioning unit. The holding member holds the transferring member. The supporting member movably supports the holding member, so that the transferring member can move toward or away from a specific member arranged in the main body. The first biasing unit biases the transferring member toward the specific member. When the cover is in a closed state, the transferring member is pressed against the specific member. The positioning unit performs positioning of the supporting member with respect to the main body.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: March 9, 2010
    Assignee: Ricoh Company, Limited
    Inventors: Hiroshi Fujiwara, Masafumi Takahira, Yasuhide Ohkubo, Ippei Kimura, Tomofumi Inoue, Takeru Muramatsu
  • Publication number: 20100019440
    Abstract: In a recording medium conveyer, a driver drives a feeding member and a conveying member provided downstream from the feeding member in a recording medium conveyance direction independently. A controller stops driving the feeding member when a first time period elapses after a recording medium reaches the conveying member. When a selector judges that the thickness of the recording medium identifies the recording medium as thin paper, the controller does not drive the feeding member after the controller starts driving the conveying member, and when the selector judges that the recording medium has a thickness greater than a thickness of the recording medium that identifies the recording medium as thin paper, the controller restarts driving the feeding member no later than when the controller starts driving the conveying member.
    Type: Application
    Filed: July 20, 2009
    Publication date: January 28, 2010
    Inventors: Hiroshi Fujiwara, Mizuna Tanaka, Tomoyoshi Yamazaki, Toshikane Nishii, Kazuyoshi Kondo, Haruyuki Honda
  • Publication number: 20090315250
    Abstract: A sheet feeding device includes a first roller that draws a recording medium at a first position and feeds the recording medium; a friction pad that comes into contact with the first roller with a predetermined contact pressure at a second position that is close to and downstream of the first position in a conveying direction of the recording medium and nips the recording medium with the first roller to convey the recording medium in the conveying direction; and a second roller that comes into contact with the first roller at a third position that is close to and downstream of the second position in the conveying direction and nips the recording medium with the first roller.
    Type: Application
    Filed: May 14, 2009
    Publication date: December 24, 2009
    Inventors: Ippei Kimura, Yasuo Matsuyama, Hiroshi Fujiwara, Yasuhide Ohkubo, Toshikane Nishii, Mizuna Tanaka, Tomoyoshi Yamazaki, Haruyuki Honda, Masafumi Takahira
  • Publication number: 20090302521
    Abstract: A base plate is selectively attached to a lower surface of a main body of an image forming apparatus or to an optional sheet feeder attachable to the main body.
    Type: Application
    Filed: May 28, 2009
    Publication date: December 10, 2009
    Inventors: Kazuyoshi Kondo, Yasuo Matsuyama, Hiroshi Fujiwara, Yasuhide Ohkubo, Ippei Kimura, Toshikane Nishii, Mizuna Tanaka, Tomoyoshi Yamazaki, Haruyuki Honda, Masafumi Takahira
  • Publication number: 20090295061
    Abstract: A sheet discharge device discharges a sheet to a sheet discharge tray. The sheet discharge device includes a rotary shaft, two inside drive rollers, two outside drive rollers, two inside driven rollers, two outside driven rollers, two end retainers, and two inside retainers. The drive rollers are rotatably attached to the rotary shaft. Each of the driven rollers opposes a corresponding one of the drive rollers to be driven by the drive roller. The end retainers and the inside retainers rotatably extend from the rotary shaft across a common tangent of the driven rollers and the drive rollers. The end retainers are longer than the inside rollers and constructed so as to rest on the stacked sheets.
    Type: Application
    Filed: May 26, 2009
    Publication date: December 3, 2009
    Inventors: Haruyuki Honda, Hiroshi Fujiwara, Kazuyoshi Kondo, Toshikane Nishii, Mizuna Tanaka, Tomoyoshi Yamazaki
  • Patent number: 7607658
    Abstract: A sheet conveyance apparatus includes a sheet conveyance path, a first conveyance mechanism located upstream in the sheet conveyance path, and a first drive mechanism configured to drive the first conveyance mechanism. The apparatus further includes a second conveyance mechanism located downstream in the sheet conveyance path, a second drive mechanism configured to drive the second conveyance mechanism, a first intermediate conveyance mechanism located between the first and second conveyance mechanisms in the sheet conveyance path, and a first drive transmission mechanism configured to intermittently transmit drive force from the first drive mechanism to the first intermediate conveyance mechanism. The sheet conveyance apparatus can be provided in an image forming apparatus.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: October 27, 2009
    Assignee: Ricoh Co., Ltd.
    Inventor: Hiroshi Fujiwara
  • Publication number: 20090174135
    Abstract: A sheet conveying apparatus includes a sheet containing unit that contains sheets; a sheet conveying unit that conveys the sheets; a separating unit that separates a single sheet from the sheets; a holding unit that holds the separating unit; and a vibration applying unit that applies a vibration to any one of the sheets conveyed by the sheet conveying unit and the separating unit before starting conveyance of the sheets.
    Type: Application
    Filed: December 19, 2008
    Publication date: July 9, 2009
    Inventors: Mizuna Tanaka, Yasuo Matsuyama, Hiroshi Fujiwara, Tomoyoshi Yamazaki, Toshikane Nishii, Kazuyoshi Kondo, Yasuhide Ohkubo, Haruyuki Honda, Ippei Kimura, Masafumi Takahira