Patents by Inventor Mamoru Yorimoto

Mamoru Yorimoto 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: 20110205299
    Abstract: An image forming apparatus including a first carriage movable in a main scanning direction, a second carriage separatably dockable with the first carriage, a first positioning unit to position the second carriage relative to the first carriage in a sub-scanning direction, a second positioning unit to position the second carriage relative to the first carriage in a rotary direction, and a third positioning unit to position the second carriage relative to the first carriage in the main scanning direction. The first positioning unit includes a reference shaft and notched positioning members to engage the reference shaft. The second positioning unit contacts one of the first and second carriages in the rotary direction upon docking of the first and second carriages. The third positioning unit includes a positioning member, parallel grooved members in the sub-scanning direction, and parallel shafts extending in the sub-scanning direction to engage the grooved members.
    Type: Application
    Filed: February 16, 2011
    Publication date: August 25, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventors: Shinichiro NARUSE, Ichiro Komuro, Mamoru Yorimoto, Soichi Saiga, Ryusuke Mase
  • Publication number: 20110199410
    Abstract: An image forming apparatus including a first carriage having a first recording head to eject black liquid droplets, a second carriage having a second recording head to eject color liquid droplets and separatably dockable with the first carriage, a position detector to detect a position of the second carriage relative to the first carriage in a state in which the first and second carriages are docked with each other, and a landing position corrector to correct landing positions of liquid droplets ejected from at least one of the first and second recording heads. The landing position corrector holds the position of the second carriage obtained by the position detector as a reference position and adjusts a correction amount for correcting the landing positions based on an amount of shift between the reference position and a present position of the second carriage docked with the first carriage.
    Type: Application
    Filed: February 15, 2011
    Publication date: August 18, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventors: Ryusuke MASE, Ichiro Komuro, Mamoru Yorimoto, Shinichiro Naruse, Soichi Saiga
  • Patent number: 7992953
    Abstract: An adjustment pattern, which is composed of a reference pattern made of plural independent liquid droplets and a pattern to be measured made of plural independent liquid droplets ejected under an ejection condition different from the reference pattern, is formed on a water-repellent conveying belt. Then, light is applied to the adjustment pattern to receive the regular reflection light from the adjustment pattern, so that the adjustment pattern is scanned. The distance between the respective patterns is measured based on the measured result. Finally, liquid droplet ejection timing of the recording head is corrected based on the result thus measured.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: August 9, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Mamoru Yorimoto, Noboru Sawayama, Kenichi Kawabata, Tetsu Morino, Tetsuro Hirota, Takumi Hagiwara
  • Publication number: 20110141192
    Abstract: An image forming apparatus including a first carriage having a first recording head and a first lifting/lowering unit, a second carriage having a second recording head and a second lifting/lowering unit, a drive source, a drive coupling unit provided to the drive source, a first coupling unit, a second coupling unit, a docking/separation unit that docks and separates the first and second carriages, and an accommodation/coupling unit. A first end of the second coupling unit is coupled to the drive coupling unit, and the accommodation/coupling unit couples the first coupling unit to a second end of the second coupling unit and accommodates the first coupling unit within the first carriage to uncouple the first coupling unit from the second end of the second coupling unit. Accommodation and coupling of the first coupling unit are performed in conjunction with docking and separation of the first and second carriages.
    Type: Application
    Filed: December 9, 2010
    Publication date: June 16, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventors: Ichiro KOMURO, Shinichiro Naruse, Mamoru Yorimoto, Ryusuke Mase, Soichi Saiga
  • Publication number: 20110134187
    Abstract: An image forming apparatus including a first carriage having a recording head that ejects black liquid droplets and is movable in a main scanning direction and a second carriage having a recording head that ejects color liquid droplets and is detachably attachable to the first carriage within a scanning range of the first carriage in the main scanning direction. The second carriage when attached to the first carriage is movable in the main scanning direction together with the first carriage. Attachment and detachment of the second carriage to and from the first carriage are performed based on a predetermined reference position of the first carriage in the main scanning direction.
    Type: Application
    Filed: December 6, 2010
    Publication date: June 9, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventors: Shinichiro Naruse, Ichiro Komuro, Mamoru Yorimoto, Soichi Saiga, Ryusuka Mase
  • Publication number: 20110134190
    Abstract: An image forming apparatus including a first carriage having a recording head that ejects black liquid droplets and is movable in a main scanning direction, a second carriage having a recording head that ejects color liquid droplets and is detachably attachable to the first carriage to move in the main scanning direction together with the first carriage while attached to the first carriage, and a cap member that caps the recording head of the second carriage while the first carriage is moving with the second carriage separated from the first carriage. Attachment and detachment of the second carriage to and from the first carriage are performed within a scanning range through which the first carriage is movable.
    Type: Application
    Filed: December 1, 2010
    Publication date: June 9, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventors: Ryusuke MASE, Ichiro Komuro, Mamoru Yorimoto, Shinichiro Naruse, Soichi Saiga
  • Patent number: 7914096
    Abstract: A disclosed image forming apparatus includes a recording head configured to jet liquid droplets; a pattern forming unit configured to form, on a water-repellent surface of a water-repellent sheet member, an adjustment pattern used for correcting shifts in landing positions of the liquid droplets, wherein the adjustment pattern includes plural liquid droplets that are separated from each other, and the water-repellent surface having a water-repellent property is formed on at least a part of a surface of the water-repellent sheet member; a reading unit including a light emitting unit configured to irradiate light onto the adjustment pattern and a light receiving unit configured to receive specular reflection light from the adjustment pattern; and a landing position correction unit configured to correct, based on a reading result obtained by the reading unit, the shifts in the landing positions of the liquid droplets that are jetted from the recording head.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: March 29, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Takumi Hagiwara, Noboru Sawayama, Kenichi Kawabata, Mamoru Yorimoto, Tetsuro Hirota, Tetsu Morino
  • Patent number: 7905590
    Abstract: A liquid-ejection-type image forming apparatus includes a recording head configured to print by ejecting ink liquid, and an electrostatic-absorption belt configured to convey printing paper. The liquid-ejection-type image forming apparatus performs a cockling-preventing mode operation which stops printing operation, separates the printing paper from the electrostatic-absorption belt, and restarts the printing operation after replacing the printing paper on the electrostatic-absorption belt.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: March 15, 2011
    Assignee: Ricoh Company, Ltd.
    Inventor: Mamoru Yorimoto
  • Patent number: 7854489
    Abstract: A disclosed image forming apparatus includes a carriage having a head for jetting droplets; a pattern forming unit configured to form, on a belt, a pattern used for detecting displacement of landing positions of the droplets; a reading unit configured to scan the belt before the pattern formation to output a first result, and scan the pattern to output a second result; a correcting unit configured to correct the displacement based on the second result; a frequency analyzing unit configured to calculate frequencies of the belt and amplitudes of respective frequency components based on the first result; and a peak frequency calculating unit configured to calculate peak frequencies of the belt based on the frequencies of the belt and the amplitudes of the frequency components, the peak frequencies being frequency components whose amplitude exceeds a predetermined level. The pattern is formed at a frequency different from the peak frequencies.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: December 21, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Takumi Hagiwara, Kenichi Kawabata, Mamoru Yorimoto, Takayuki Niihara, Shinichiro Naruse, Tetsu Morino
  • Patent number: 7841682
    Abstract: An image forming apparatus includes a carriage carrying a recording head configured to discharge a droplet. A landing position error detecting pattern is formed on a pattern forming member. Based on a result of reading the landing position error detecting pattern, a landing position error of the droplet discharged by the recording head is corrected. Either a first pattern or a second pattern is selected as the landing position error detecting pattern, depending on a surface condition of the pattern forming member. The first pattern produces a relatively small amount of specular reflection compared with diffused reflection, while the second pattern produces a relatively large amount of specular reflection compared with diffused reflection, upon irradiation with light.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: November 30, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Mamoru Yorimoto, Kenichi Kawabata, Takayuki Niihara, Shinichiro Naruse, Tetsu Morino, Takumi Hagiwara
  • Publication number: 20100066781
    Abstract: An inkjet-type image forming apparatus includes a recording head configured to eject ink to form an image; a carriage where the recording head is provided, the carriage being configured to reciprocate in a direction orthogonal to a sheet transport direction; a transport unit disposed upstream of a print area in the sheet transport direction, the transport unit being configured to intermittently transport a sheet to the print area; a transport control unit configured to control the transport unit; a platen guide plate; a suction unit configured to suction the sheet onto the platen guide plate; and a control unit.
    Type: Application
    Filed: August 5, 2009
    Publication date: March 18, 2010
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takayuki Niihara, Mamoru Yorimoto, Yuichiro Maeyama
  • Patent number: 7631862
    Abstract: A sheet feeding device comprises a sheet feeding roller, having a first circumferential section and a second circumferential section, configured to rotate in a direction from the first circumferential section to the second circumferential section; and a pressure plate provided apart from the sheet feeding roller and configured to mount thereon a recording sheet stack having recording sheets ranging from a maximum number to a minimum number. The first circumferential section includes a first contact point for contacting, when the sheet feeding roller is rotated, a leading top edge of the recording sheet stack having the maximum number of recording sheets; and a second contact point for contacting, when the sheet feeding roller is rotated, a leading top edge of the recording sheet stack having the minimum number of recording sheets.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: December 15, 2009
    Assignee: Ricoh Co., Ltd.
    Inventors: Mamoru Yorimoto, Mitsuru Yamada, Masashi Kimijima
  • Publication number: 20090189937
    Abstract: A disclosed image forming apparatus includes a carriage on which a recording head is mounted that has a nozzle array where plural nozzles for ejecting droplets are arranged, the carriage being configured to be moved in a direction orthogonal to a nozzle arrangement direction; a transport belt facing the recording head and configured to transport a sheet; a print pattern forming unit configured to form a print pattern on the transport belt by causing at least the nozzles at opposing ends of the nozzle array to eject the droplets onto the transport belt while stopping the carriage; a reading unit configured to read the print pattern; a measuring unit configured to measure print positions of plural points of the print pattern in a direction orthogonal to the nozzle arrangement direction; and a detecting unit configured to detect an inclination of the recording head.
    Type: Application
    Filed: January 26, 2009
    Publication date: July 30, 2009
    Applicant: RICOH COMPANY, LTD
    Inventors: Shinichiro Naruse, Kenichi Kawabata, Takayuki Niihara, Mamoru Yorimoto, Tetsu Morino, Takumi Hagiwara
  • Publication number: 20090185813
    Abstract: A disclosed image forming apparatus includes a carriage having a head for jetting droplets; a pattern forming unit configured to form, on a belt, a pattern used for detecting displacement of landing positions of the droplets; a reading unit configured to scan the belt before the pattern formation to output a first result, and scan the pattern to output a second result; a correcting unit configured to correct the displacement based on the second result; a frequency analyzing unit configured to calculate frequencies of the belt and amplitudes of respective frequency components based on the first result; and a peak frequency calculating unit configured to calculate peak frequencies of the belt based on the frequencies of the belt and the amplitudes of the frequency components, the peak frequencies being frequency components whose amplitude exceeds a predetermined level. The pattern is formed at a frequency different from the peak frequencies.
    Type: Application
    Filed: January 16, 2009
    Publication date: July 23, 2009
    Applicant: RICOH COMPANY, LTD.
    Inventors: TAKUMI HAGIWARA, KENICHI KAWABATA, MAMORU YORIMOTO, TAKAYUKI NIIHARA, SHINICHIRO NARUSE, TETSU MORINO
  • Publication number: 20090184993
    Abstract: An image forming apparatus includes a carriage carrying a recording head configured to discharge a droplet. A landing position error detecting pattern is formed on a pattern forming member. Based on a result of reading the landing position error detecting pattern, a landing position error of the droplet discharged by the recording head is corrected. Either a first pattern or a second pattern is selected as the landing position error detecting pattern, depending on a surface condition of the pattern forming member. The first pattern produces a relatively small amount of specular reflection compared with diffused reflection, while the second pattern produces a relatively large amount of specular reflection compared with diffused reflection, upon irradiation with light.
    Type: Application
    Filed: January 15, 2009
    Publication date: July 23, 2009
    Applicant: RICOH COMPANY, LTD
    Inventors: Mamoru YORIMOTO, Kenichi Kawabata, Takayuki Niihara, Shinichiro Naruse, Tetsu Morino, Takumi Hagiwara
  • Publication number: 20090148181
    Abstract: A side wall surface of a carriage is disclosed with two first projection parts and a second projection part that define the inclination of a reflective optical sensor in its vertical direction. The two first projection parts are arranged at the same height position with a detection surface as a reference, and the second projection part is arranged at a position higher than the first projection parts with the detection surface as the reference. The second projection part has a first part higher in position from the side wall surface of the carriage than the first projection parts and has a second part lower in position than the first part. The second part has a screw hole into which a clamping member for fixing the reflective optical sensor to the second part is tightened.
    Type: Application
    Filed: December 2, 2008
    Publication date: June 11, 2009
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takayuki NIIHARA, Kenichi Kawabata, Shinichiro Naruse, Mamoru Yorimoto, Takumi Hagiwara, Tetsu Morino
  • Publication number: 20090015621
    Abstract: An image forming apparatus includes a recording head, a water-repellent transfer belt, a pattern formation controller, a read unit, and a detection unit. The recording head has a plurality of nozzles aligned in a given direction, and ejects droplets of a liquid therefrom. The pattern formation controller directs each of the plurality of nozzles to eject the liquid to form a detection pattern on the transfer belt. The detection pattern has multiple droplets ejected from each of the plurality of nozzles sequentially arranged and spaced apart from each other both in the given direction and in a direction orthogonal to the given direction. The read unit includes a light emitting element and a light receiving element, and reads the detection pattern to output a read result. The detection unit detects a defective nozzle according to the read result.
    Type: Application
    Filed: June 30, 2008
    Publication date: January 15, 2009
    Inventors: Tetsuro Hirota, Takumi Hagiwara, Kenichi Kawabata, Mamoru Yorimoto, Tetsu Morino, Noboru Sawayama
  • Publication number: 20080231649
    Abstract: A disclosed image forming apparatus for forming an image on a recording medium being conveyed includes: a recording head discharging droplets; a pattern forming unit forming an adjustment pattern for detecting displacement of landing positions of droplets on a water-repellent member, the adjustment pattern including a minimum block pattern for each detection item and being formed with plural droplets independent of one another; a reading unit including a light emitting unit projecting a light onto the adjustment pattern and a light receiving unit receiving a regular reflection light from the adjustment pattern; and a landing position correcting unit correcting the landing positions of the droplets discharged from the recording head based on a result of reading by the reading unit.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 25, 2008
    Inventors: Kenichi KAWABATA, Noboru Sawayama, Tetsuro Hirota, Mamoru Yorimoto, Tetsu Morino, Takumi Hagiwara
  • Publication number: 20080225066
    Abstract: An adjustment pattern, which is composed of a reference pattern made of plural independent liquid droplets and a pattern to be measured made of plural independent liquid droplets ejected under an ejection condition different from the reference pattern, is formed on a water-repellent conveying belt. Then, light is applied to the adjustment pattern to receive the regular reflection light from the adjustment pattern, so that the adjustment pattern is scanned. The distance between the respective patterns is measured based on the measured result. Finally, liquid droplet ejection timing of the recording head is corrected based on the result thus measured.
    Type: Application
    Filed: March 13, 2008
    Publication date: September 18, 2008
    Applicant: Ricoh Company, Ltd.
    Inventors: Mamoru YORIMOTO, Noboru Sawayama, Kenichi Kawabata, Tetsu Morino, Tetsuro Hirota, Takumi Hagiwara
  • Publication number: 20080225067
    Abstract: An image forming apparatus is provided with a carriage in which recording heads having nozzles for ejecting liquid droplets are mounted and is configured to form an image on a recording medium being transported. The image forming apparatus includes a pattern forming unit that forms an impact position displacement adjustment pattern formed of plural independent liquid droplets on a water repellent member; a reading unit that includes a light emitting unit for emitting light onto the adjustment pattern and a light receiving unit for receiving specular reflection light from the adjustment pattern; and an impact position correcting unit that corrects an impact position of a liquid droplet to be ejected from the recording head based on a read result by the reading unit. The reading unit is disposed on the carriage and is arranged close to the side of a guide member that guides movement of the carriage.
    Type: Application
    Filed: March 13, 2008
    Publication date: September 18, 2008
    Applicant: Ricoh Company, Ltd.
    Inventors: Tetsu MORINO, Noboru Sawayama, Kenichi Kawabata, Mamoru Yorimoto, Tetsuro Hirota, Takumi Hagiwara