Patents by Inventor Motoharu Takahashi

Motoharu Takahashi 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: 10875730
    Abstract: A sheet conveying device includes a detector configured to detect an attitude of a conveyance target medium, a corrector configured to perform a correcting operation based on a detection result of the detector, and circuitry configured to calculate an angular displacement correction amount and a lateral displacement correction amount of the conveyance target medium, cause the corrector to perform the correcting operation in a direction perpendicular to a sheet conveying direction, based on the lateral displacement correction amount, after the corrector grips the conveyance target medium, and cause the corrector to rotate by the angular displacement correction amount of the conveyance target medium before the corrector grips the conveyance target medium and to perform the correcting operation in a direction of rotation of the conveyance target medium, based on the angular displacement correction amount, after the corrector grips the conveyance target medium.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: December 29, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Eri Uchida, Motoharu Takahashi, Yuichiro Maeyama, Tomohiro Egawa
  • Publication number: 20190283998
    Abstract: A sheet conveying device includes a detector configured to detect an attitude of a conveyance target medium, a corrector configured to perform a correcting operation based on a detection result of the detector, and circuitry configured to calculate an angular displacement correction amount and a lateral displacement correction amount of the conveyance target medium, cause the corrector to perform the correcting operation in a direction perpendicular to a sheet conveying direction, based on the lateral displacement correction amount, after the corrector grips the conveyance target medium, and cause the corrector to rotate by the angular displacement correction amount of the conveyance target medium before the corrector grips the conveyance target medium and to perform the correcting operation in a direction of rotation of the conveyance target medium, based on the angular displacement correction amount, after the corrector grips the conveyance target medium.
    Type: Application
    Filed: March 1, 2019
    Publication date: September 19, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Eri UCHIDA, Motoharu TAKAHASHI, Yuichiro MAEYAMA, Tomohiro EGAWA
  • Publication number: 20190276258
    Abstract: A sheet conveying device includes a position detector configured to detect a position of a side end portion of a conveyance target medium, a position adjuster configured to move in at least one of a width direction of the conveyance target medium and a rotation direction of the conveyance target medium within a plane of sheet conveyance, while conveying the conveyance target medium, and adjust a position of the conveyance target medium, according to the position of the side end portion of the conveyance target medium detected by the position detector, a transfer rotary body disposed downstream from the position adjuster in a sheet conveying direction and having a receiver mounted on the rotary body to receive the conveyance target medium, and circuitry configured to change a rotation speed of the transfer rotary body according to the position of the conveyance target medium after adjusted by the position adjuster.
    Type: Application
    Filed: February 7, 2019
    Publication date: September 12, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiro Egawa, Yuichiro MAEYAMA, Motoharu TAKAHASHI
  • Publication number: 20190241385
    Abstract: An image forming apparatus, in which a method of correcting a positional deviation of a sheet is performed, includes a detecting device to detect a position of the sheet, a pair of sheet conveying bodies to convey the sheet and correct the positional deviation of the sheet, an image forming device to form an image on the sheet, and circuitry to calculate a first positional deviation amount of the sheet based on a first detection result of the detecting device, cause the pair of sheet conveying bodies to correct the positional deviation of the sheet based on the first positional deviation amount, calculate a second positional deviation amount of the sheet based on a second detection result of the detecting device, and cause the image forming device to correct the positional deviation of an image forming position on the sheet based on the second positional deviation amount.
    Type: Application
    Filed: January 25, 2019
    Publication date: August 8, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Takaaki KANEKO, Motoharu TAKAHASHI, Yuichiro MAEYAMA, Tomohiro EGAWA
  • Patent number: 10322895
    Abstract: A material conveyor, included in a transfer device of an image forming apparatus and configured to use position control of rotary bodies, includes a first rotary body and a second rotary body disposed opposing each other in an opposing region through which a material is conveyable, and a contact and separation device configured to cause at least a surface, of at least one of the first rotary body and the second rotary body to move, between a separated position and a contact position. The contact and separation device is configured to cause the at least the surface to move from the separated position to the contact position, at a first speed, and then to move at a second speed slower than the first speed. A method of position control includes moving at least the surface at different speeds or based on a distance relative to a threshold distance.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: June 18, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Daisuke Momose, Masahiro Ashikawa, Motoharu Takahashi, Yuuya Mizuguchi
  • Publication number: 20190161299
    Abstract: A sheet conveying device includable in an image forming apparatus that uses a method of conveying a conveyance target medium and a method of forming an image, includes a position detector, a position adjuster, and circuitry. The position detector is configured to detect a position of a conveyance target medium. Based on a detection of the position of the conveyance target medium by the position detector, the position adjuster moves in at least one of a width direction of the conveyance target medium and a rotation direction of the conveyance target medium within a plane of conveyance of the conveyance target medium and repeatedly adjusts the position of the conveyance target medium while conveying the conveyance target medium. The circuitry changes a conveying speed of the conveyance target medium, according to a change of the position of the conveyance target medium after adjusted by the position adjuster.
    Type: Application
    Filed: November 29, 2018
    Publication date: May 30, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiro EGAWA, Yuichiro MAEYAMA, Motoharu TAKAHASHI
  • Publication number: 20190161301
    Abstract: A sheet conveying device, which is included in an image forming apparatus, includes a plurality of position detectors, a leading end detector, and a position adjuster. The plurality of position detectors is configured to detect a position of a sheet. The leading end detector is configured to detect a leading end of the sheet. The position adjuster is configured to, based on a detection result obtained by the plurality of position detectors, rotate in a rotation direction of the sheet within a plane of conveyance of the sheet to change the position of the sheet the position adjuster grips the sheet under conveyance to cause the leading end detector to rotate with the position adjuster in the rotation direction of the sheet within the plane of conveyance of the sheet.
    Type: Application
    Filed: November 30, 2018
    Publication date: May 30, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Yuichiro MAEYAMA, Tomohiro EGAWA, Motoharu TAKAHASHI
  • Patent number: 9983534
    Abstract: A motor control device for driving a motor, the motor control device includes: a receiver configured to receive, from an external source, a drive command containing a rotation direction command designating a rotation direction of the motor; a storage part configured to store the rotation direction of the motor indicated by the rotation direction command when the motor is driven using the rotation direction command; and a controller configured to, when a new piece of the drive command is received from the external source, control rotation reversing of the motor based on a rotation direction of the motor indicated by the rotation direction command contained in the received piece of the drive command and the rotation direction of the motor stored in the storage part.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: May 29, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Motoharu Takahashi, Yoshihiro Asano, Takuya Murata, Shingo Nagatsuka, Kentaroh Kurosu
  • Patent number: 9944482
    Abstract: A motor control device includes: an electric-current detection unit configured to detect an electric current that flows through a motor at a time when the motor is not to be driven; a voltage-polarity determining unit configured to determine polarity of a voltage corresponding to the detected electric current; and an operating-state management unit configured to perform control of stopping the motor depending on the polarity of the voltage.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: April 17, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Asano, Shingo Nagatsuka, Takuya Murata, Kentaroh Kurosu, Motoharu Takahashi
  • Publication number: 20180093841
    Abstract: A material conveyor, included in a transfer device of an image forming apparatus and configured to use position control of rotary bodies, includes a first rotary body and a second rotary body disposed opposing each other in an opposing region through which a material is conveyable, and a contact and separation device configured to cause at least a surface, of at least one of the first rotary body and the second rotary body to move, between a separated position and a contact position. The contact and separation device is configured to cause the at least the surface to move from the separated position to the contact position, at a first speed, and then to move at a second speed slower than the first speed. A method of position control includes moving at least the surface at different speeds or based on a distance relative to a threshold distance.
    Type: Application
    Filed: September 29, 2017
    Publication date: April 5, 2018
    Applicant: Ricoh Company, Ltd.
    Inventors: Daisuke MOMOSE, Masahiro ASHIKAWA, Motoharu TAKAHASHI, Yuuya MIZUGUCHI
  • Publication number: 20170187321
    Abstract: A motor control device includes a controller and a detector. The controller is configured to control, when receiving an operation request indicating rotation or stop of a motor, rotation of the motor based on the operation request. The detector is configured to detect whether the motor is rotating. The controller stops the motor when the detector detects rotation of the motor after an elapsed time from reception of the operation request indicating stop of the motor reaches a first threshold.
    Type: Application
    Filed: December 22, 2016
    Publication date: June 29, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Shingo NAGATSUKA, Kentaroh KUROSU, Yoshihiro ASANO, Motoharu TAKAHASHI, Takuya MURATA
  • Publication number: 20170090386
    Abstract: A motor control device for driving a motor, the motor control device includes: a receiver configured to receive, from an external source, a drive command containing a rotation direction command designating a rotation direction of the motor; a storage part configured to store the rotation direction of the motor indicated by the rotation direction command when the motor is driven using the rotation direction command; and a controller configured to, when a new piece of the drive command is received from the external source, control rotation reversing of the motor based on a rotation direction of the motor indicated by the rotation direction command contained in the received piece of the drive command and the rotation direction of the motor stored in the storage part.
    Type: Application
    Filed: September 26, 2016
    Publication date: March 30, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Motoharu TAKAHASHI, Yoshihiro ASANO, Takuya MURATA, Shingo NAGATSUKA, Kentaroh KUROSU
  • Publication number: 20170001822
    Abstract: A motor control device includes: an electric-current detection unit configured to detect an electric current that flows through a motor at a time when the motor is not to he driven; a voltage-polarity determining unit configured to determine polarity of a voltage corresponding to the detected electric current; and an operating-state management unit configured to perform control of stopping the motor depending on the polarity of the voltage.
    Type: Application
    Filed: June 30, 2016
    Publication date: January 5, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Yoshihiro ASANO, Shingo NAGATSUKA, Takuya MURATA, Kentaroh KUROSU, Motoharu TAKAHASHI
  • Patent number: 8590891
    Abstract: A recording medium conveyor includes a first conveyance part conveying a recording medium; a second conveyance part conveying the conveyed recording medium toward a transfer position; a detection part detecting the position of the recording medium conveyed by the second conveyance part; a position error detection part detecting a position error between the transfer position and a position at which there is to be the recording medium when an image reaches the transfer position; a position error storage part storing the detected position errors; a steady-state position error calculation part calculating a steady-state position error from the stored position errors; a first control part controlling the conveyance speed of the first conveyance part to reduce the steady-state position error; and a second control part controlling the conveyance speed of the second conveyance part to reduce the detected position error, with the steady-state position error being reduced.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: November 26, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Motoharu Takahashi, Yusuke Ishizaki, Masahiro Ashikawa, Minoru Takahashi
  • Publication number: 20130161900
    Abstract: A recording medium conveyor includes a first conveyance part conveying a recording medium; a second conveyance part conveying the conveyed recording medium toward a transfer position; a detection part detecting the position of the recording medium conveyed by the second conveyance part; a position error detection part detecting a position error between the transfer position and a position at which there is to be the recording medium when an image reaches the transfer position; a position error storage part storing the detected position errors; a steady-state position error calculation part calculating a steady-state position error from the stored position errors; a first control part controlling the conveyance speed of the first conveyance part to reduce the steady-state position error; and a second control part controlling the conveyance speed of the second conveyance part to reduce the detected position error, with the steady-state position error being reduced.
    Type: Application
    Filed: December 19, 2012
    Publication date: June 27, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Motoharu TAKAHASHI, Yusuke Ishizaki, Masahiro Ashikawa, Minoru Takahashi
  • Patent number: 8064781
    Abstract: An image forming apparatus includes an opening-closing lid for opening and closing an opening portion formed in an apparatus main body; a detection unit for detecting an open state of the opening-closing lid; an execution unit for executing a specific operation; a main power source for supplying power to the execution unit; a retaining unit for retaining an open history indicating the open state of the opening-closing lid when the detection unit detects the open state of the opening-closing lid during a period of time when the main power source does not supply power to the execution unit; and a determining unit for determining whether the execution unit executes the specific operation according to the open history retained in the retaining unit when the main power source starts supplying power to the execution unit.
    Type: Grant
    Filed: June 19, 2008
    Date of Patent: November 22, 2011
    Assignee: Oki Data Corporation
    Inventor: Motoharu Takahashi
  • Publication number: 20090003869
    Abstract: An image forming apparatus includes an opening-closing lid for opening and closing an opening portion formed in an apparatus main body; a detection unit for detecting an open state of the opening-closing lid; an execution unit for executing a specific operation; a main power source for supplying power to the execution unit; a retaining unit for retaining an open history indicating the open state of the opening-closing lid when the detection unit detects the open state of the opening-closing lid during a period of time when the main power source does not supply power to the execution unit; and a determining unit for determining whether the execution unit executes the specific operation according to the open history retained in the retaining unit when the main power source starts supplying power to the execution unit.
    Type: Application
    Filed: June 19, 2008
    Publication date: January 1, 2009
    Inventor: Motoharu Takahashi