Patents by Inventor Toshiyuki Andoh

Toshiyuki Andoh 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: 8837968
    Abstract: An image formation apparatus includes an image carrier; a driving source generating a driving force for the image carrier; a drive transmission unit; a driving control unit controlling the driving source; an image formation unit forming an image on a surface of the image carrier; a transfer nip between a transfer member and the surface of the image carrier; a driving-force exerting unit exerting a driving force on any one of the image carrier and a first drive transmission member on a drive transmission path, and a specific drive transmission member imparting weakest spring characteristics among drive transmission members to a drive transmission system; a detecting unit detecting an estimation parameter used in estimating a driving-load-torque variation amount of the image carrier; a torque-variation-amount estimation unit; and a driving-force control unit controlling the driving force to cancel the driving-load-torque variation.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: September 16, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Andoh, Takashi Hashimoto, Takashi Hodoshima, Masahiko Kato
  • Patent number: 8538310
    Abstract: A load torque variation upon entry or exit of a sheet into a nipping portion is reduced while a nipping force necessary for image formation is provided. An image transfer apparatus, an image fixing apparatus, or a registration apparatus comprises an opposite roller, a transfer roller, and a compression spring for pressing the opposite roller onto the transfer roller. A sheet of transfer material is transported into a nipping portion between the opposite roller and the transfer roller, where an image on the opposite roller is transferred to the transfer material. The apparatus includes a retaining unit configured to retain a certain distance between the first rotating body and the second rotating body as long as the thickness of the transfer material that passes through the nipping portion remains the same.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: September 17, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiromichi Matsuda, Toshiyuki Andoh, Takashi Hashimoto, Takashi Hodoshima, Tatsuhiko Oikawa, Hidetaka Noguchi, Seiji Hoshino, Makoto Komatsu
  • Patent number: 8422037
    Abstract: In an image forming apparatus, a distance adjusting unit adjusts an inter-unit distance between a contact unit and an image carrier by moving the image carrier or the contact unit by applying an opposing force to the image carrier or the contact unit against a biasing force applied by a biasing unit based on thickness information of a recording sheet acquired by a thickness-information acquiring unit and data indicating a relationship between the thickness information and an inter-unit distance change amount stored in a data storage unit.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: April 16, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Hodoshima, Toshiyuki Andoh, Takashi Hashimoto, Hidetaka Noguchi, Seiji Hoshino, Tatsuhiko Oikawa, Tetsuo Watanabe
  • Patent number: 8385762
    Abstract: A transfer roller lies opposite to a supporting roller across an image carrying belt and abuts against the outer surface of the image carrying belt to form a transfer nip. A driving force transmission unit transmits driving force from a driving source to a driving roller. A drive control unit performs drive control of the driving source. A feedforward control unit performs feedforward control on the driving source via the drive control unit. An entry detecting unit detects entry of a sheet in the transfer nip. The feedforward control unit considers an entry detection signal output by the entry sensor as a trigger for performing feedforward control after a predetermined time.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: February 26, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Hidetaka Noguchi, Toshiyuki Andoh, Takashi Hodoshima, Seiji Hoshino, Takashi Hashimoto
  • Patent number: 8364071
    Abstract: A sheet conveying device includes a pair of upstream rollers and a pair of downstream rollers each including a drive roller and a driven roller, a calculating unit, and a control unit. The upstream rollers include a measuring unit that obtains speed information of the upstream rollers. The calculating unit calculates a target value based on the speed information. The control unit controls the speed of the drive roller of the downstream rollers based on the target value.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: January 29, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Hidetaka Noguchi, Toshiyuki Andoh, Seiji Hoshino, Takashi Hodoshima, Tatsuhiko Oikawa, Hiromichi Matsuda, Makoto Komatsu, Takashi Hashimoto
  • Patent number: 8254811
    Abstract: An image-carrier driving unit drives an image carrier. An image forming unit forms an image on the image carrier. A moving-member driving unit drives a moving member that is movable towards and away from the image carrier. A detecting unit detects a position of the moving member at predetermined sampling times while the moving member is moving. A movement control unit performs a feedback control on the moving-member driving unit such that a detection result of the detecting unit follows a target value corresponding to each of the predetermined sampling times when the moving member moves while the image forming unit is forming the image on the image carrier.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: August 28, 2012
    Assignee: Ricoh Company, Limitied
    Inventors: Toshiyuki Andoh, Takashi Hashimoto, Takashi Hodoshima, Hidetaka Noguchi, Seiji Hoshino, Tatsuhiko Oikawa, Tetsuo Watanabe
  • Publication number: 20120163846
    Abstract: An image formation apparatus includes an image carrier; a driving source generating a driving force for the image carrier; a drive transmission unit; a driving control unit controlling the driving source; an image formation unit forming an image on a surface of the image carrier; a transfer nip between a transfer member and the surface of the image carrier; a driving-force exerting unit exerting a driving force on any one of the image carrier and a first drive transmission member on a drive transmission path, and a specific drive transmission member imparting weakest spring characteristics among drive transmission members to a drive transmission system; a detecting unit detecting an estimation parameter used in estimating a driving-load-torque variation amount of the image carrier; a torque-variation-amount estimation unit; and a driving-force control unit controlling the driving force to cancel the driving-load-torque variation.
    Type: Application
    Filed: November 22, 2011
    Publication date: June 28, 2012
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Toshiyuki Andoh, Takashi Hashimoto, Takashi Hodoshima, Masahiko Kato
  • Patent number: 8165498
    Abstract: An image forming device is disclosed that is able to enlarge a gap of a nipping portion with a simple and inexpensive structure, and able to reduce impact when a front end of a recording sheet runs into or a back end of the recording sheet passes through the nipping portion. The image forming device includes an image carrying unit, an image forming unit, a transfer unit, a conveyance unit, a determination unit that determines whether a thickness of the recording sheet is greater than a threshold value, and a cam member that rotates to enlarge or reduce the gap of the nipping portion between the image carrying unit and the transfer unit according to rotational positions of the cam member. When the thickness of the recording sheet is greater than the threshold, the cam member rotates so that the gap of the nipping portion is enlarged.
    Type: Grant
    Filed: August 25, 2008
    Date of Patent: April 24, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Seiji Hoshino, Toshiyuki Andoh, Takashi Hodoshima, Takashi Hashimoto, Hidetaka Noguchi, Tatsuhiko Oikawa
  • Patent number: 8145105
    Abstract: A belt drive control device includes: first and second detection devices which detect the angular displacement or velocity of a driven rotary member and the angular displacement or velocity of a drive rotary member, respectively; an extraction device which extracts, from the difference between the detection results of the first and second detection devices, the amplitude and phase of a variation component due to belt thickness variation; a control device which controls the rotation of the drive rotary member in accordance with the extracted amplitude and phase; first and second holding devices which hold the extracted amplitude and phase and normal ranges of the amplitude and phase, respectively; and first and second feedback devices which feed back the amplitude and phase to the rotation control, and performs feedback by using a substitution value for the amplitude or phase if the amplitude or phase is out of the normal range, respectively.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: March 27, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuichiro Ueda, Kazuhiko Kobayashi, Takuya Uehara, Takuya Murata, Yuji Matsuda, Takahiro Kamekura, Toshiyuki Andoh, Hiromichi Matsuda, Hiroki Ohkubo
  • Patent number: 8131173
    Abstract: A driving apparatus includes a driving unit, a driven unit driven by the driving unit, a driving control unit configured to control the driving unit by performing feed-forward control based on feed-forward target data determined in advance to reduce a speed change of the driven unit. The speed change of the driven unit is expressed substantially as a positive half cycle of a sinusoidal waveform having an amplitude and a time duration, and the feed-forward target data is calculated from the amplitude and the time duration to represent a rectangular waveform approximating the positive half cycle of the sinusoidal waveform.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: March 6, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetaka Noguchi, Toshiyuki Andoh, Takashi Hodoshima, Seiji Hoshino, Tatsuhiko Oikawa, Takashi Hashimoto
  • Patent number: 8126387
    Abstract: A fluctuation detecting unit detects a fluctuation of an endless belt generated when a sheet is brought into contact with a predetermined position of the endless belt at an upstream side in a conveying direction from a nip portion based on fluctuation information acquired by a fluctuation information acquiring unit. An entry timing estimating unit estimates entry timing of the sheet into the nip portion based on a detection of the fluctuation. A correction control unit corrects a speed fluctuation of the endless belt generated when the sheet enters the nip portion by performing a feedforward control of a first driving unit based on the entry timing.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: February 28, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetaka Noguchi, Toshiyuki Andoh, Takashi Hodoshima, Tatsuhiko Oikawa, Seiji Hoshino, Hiromichi Matsuda, Makoto Komatsu, Takashi Hashimoto
  • Patent number: 8087670
    Abstract: A second rotary member is arranged opposite to a first rotary member to form a nip between them. A driving unit drives the first rotary member. A sheet-width measuring unit measures a width of a sheet to be fed into the nip. A speed compensating unit compensates a fluctuation of a rotation speed of the first rotary member occurring when the sheet is fed into the nip. The speed compensating unit adjusts a compensation target value for compensating the fluctuation of the rotation speed of the first rotary member based on the width of the sheet measured by the sheet-width measuring unit.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: January 3, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Hidetaka Noguchi, Toshiyuki Andoh, Takashi Hodoshima, Seiji Hoshino, Takashi Hashimoto, Tatsuhiko Oikawa
  • Patent number: 8081904
    Abstract: A belt drive control unit controls a rotation of belt supported by first and second rollers. Each of rotations of the first and second rollers are detected as first and second results. A rotation of the first roller is controlled in connection with thickness fluctuation in the belt using the first and second results. The belt drive control unit includes a sampling data acquisition unit, a correction value generator, a correction value storage, and a correction value reading controller. The sampling data acquisition unit obtains sampling data by sampling a difference value between the first and second results. The correction value generator generates correction value data for the belt based on the sampling data. The correction value storage stores the correction value data. The correction value reading controller reads the correction value data based on a rotation number of the belt to control a rotation of the first roller.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: December 20, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroki Ohkubo, Hiromichi Matsuda, Toshiyuki Andoh, Yuji Matsuda, Yuichiro Ueda, Kazuhiko Kobayashi, Takuya Uehara, Takuya Murata
  • Patent number: 8059991
    Abstract: A control unit calculates a difference between a displacement of a belt detected by an encoder and a predetermined target value, calculates a pulse frequency of a driving pulse signal based on a feedback control based on the difference and a feed-forward control based on a reference driving pulse frequency, sets a control range of the feedback control to be equal to or smaller than a frequency of one rotation of a driven roller, and controls driving of a pulse motor such that the belt moves at a constant speed.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: November 15, 2011
    Assignee: Ricoh Company, Limited
    Inventors: Toshiyuki Andoh, Hiromichi Matsuda, Satoru Tao, Noritaka Masuda, Yuji Uozaki, Yuichi Hirose
  • Patent number: 8036582
    Abstract: In an image forming apparatus, during a rotation of an intermediate transfer belt performed after a contact-state-changing rotation in which the number of photoconductors contacting the intermediate transfer belt has changed, a control unit of a belt driving device controls the driving speed of a belt driving motor based on a period of the intermediate transfer belt determined in the rotation immediately before the contact-state-changing rotation instead of a period determined in the contact-state-changing rotation.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: October 11, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Takuya Murata, Kazuhiko Kobayashi, Yuji Matsuda, Yuichiro Ueda, Hiromichi Matsuda, Toshiyuki Andoh, Joh Ebara, Yohei Miura, Takuya Uehara
  • Patent number: 8010027
    Abstract: An image forming apparatus includes an image transfer belt, a first pressure member, a second pressure member, and an adjustable tension member. The image transfer belt is trained around multiple rollers for rotation along an endless belt travel path to convey an image for transfer to a recording sheet. The first pressure member is disposed on an outer surface of the image transfer belt. The second pressure member is disposed on an inner surface of the image transfer belt opposite the first pressure member. The first and second pressure members define an image transfer gap therebetween. The adjustable tension member is disposed on the image transfer belt adjacent the image transfer gap to adjust tension on the image transfer belt when the recording sheet enters and exits the image transfer gap.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: August 30, 2011
    Assignee: Ricoh Company, Limited
    Inventors: Takashi Hodoshima, Toshiyuki Andoh, Seiji Hoshino, Takashi Hashimoto, Hidetaka Noguchi
  • Patent number: 7971878
    Abstract: A sheet conveying device includes a torque estimation unit that, based upon a first load torque generated at a time that a sheet-like member passes through a first nip between a first driving roller and a first driven roller of an upstream sheet conveying unit, estimates a second load torque generated at a time that the sheet-like member passes through a second nip between a second driving roller and a second driven roller of a downstream sheet conveying unit; and a control unit that controls the driving torque such that the second load torque is counterbalanced by applying a counterbalancing torque in synchronization with a timing of entry of the sheet-like member into the second nip.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: July 5, 2011
    Assignee: Ricoh Company, Limited
    Inventors: Takashi Hashimoto, Toshiyuki Andoh, Takashi Hodoshima, Seiji Hoshino, Hidetaka Noguchi, Tatsuhiko Oikawa
  • Patent number: 7945176
    Abstract: An image forming apparatus includes an image carrier that carries an image and rotates, a transfer member that rotates in contact with the image carrier and transfers an image formed on the image carrier to a recording medium, a conveying unit that conveys the recording medium to a contact position where the image carrier and the transfer member come into contact with each other, and a gap forming unit that forms a gap between the image carrier and the transfer member at the contact position. The gap forming unit forms the gap immediately before the recording medium enters the contact position.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: May 17, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Seiji Hoshino, Takashi Hashimoto, Toshiyuki Andoh, Tatsuhiko Oikawa
  • Patent number: 7929894
    Abstract: A driving control device for use in an image forming apparatus includes a control unit that analyzes any one of a speed variation pattern and a thickness variation pattern of an endless belt member of the image forming apparatus per at least one rotation of the endless belt member while endlessly moving the endless belt member by a driving rotating unit, and starts to execute, based on a result of analysis, a driving-speed-control-pattern updating process to update a driving speed control pattern of the driving rotating unit per at least one rotation of the endless belt member, after a power of an image forming apparatus is turned on and within a preparation period in which a predetermined preparation process is completed so that an image forming operation can be started based on an image formation command from an operator.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: April 19, 2011
    Assignee: Ricoh Company, Limited
    Inventors: Takuya Murata, Kazuhiko Kobayashi, Takuya Uehara, Yuji Matsuda, Yuichiro Ueda, Hiromichi Matsuda, Toshiyuki Andoh, Joh Ebara, Yohei Miura
  • Patent number: 7885587
    Abstract: An image forming apparatus includes a control unit to control a latent image support with a target rate; a first unit to detect patterns; plural parts to be detected revolving with the support; a second unit to detect passing of the part; a first generating unit to obtain an amplitude and a phase of fluctuation and a pattern for canceling out the fluctuation from the amplitude and the phase; a second generating unit to perform a process to obtain an amplitude and a phase of fluctuation while the support rotates once or more, perform the process again, calculate a change in the amplitude and phase, and generate another pattern for canceling out the change; and a correcting unit to correct the target rate by superimposing the patterns with the target rate.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: February 8, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiromichi Matsuda, Toshiyuki Andoh, Yasuhisa Ehara, Kazuhiko Kobayashi, Noriaki Funamoto, Seiichi Handa