Patents by Inventor Seiji Ogasawara

Seiji Ogasawara 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: 8747001
    Abstract: A printing apparatus capable of maintaining print sheet conveying performance while keeping apparatus cost low and apparatus size small is provided. The printing apparatus includes a conveying mechanism and a print unit. The conveying mechanism includes a conveying roller which is a driving roller, a plurality of pinch rollers which are passive rollers disposed facing the conveying roller, and a plurality of pinch roller axles supporting the pinch rollers. The print unit prints onto a sheet conveyed by the conveying rollers and the plurality of pinch rollers. The conveying mechanism includes one or more first pinch roller sets including two pinch rollers and a first pinch roller axle supporting the two pinch rollers, and one or more second pinch roller sets including three pinch rollers and a second pinch roller axle supporting the three pinch rollers.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: June 10, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Seiji Ogasawara, Shimpei Shinohara
  • Patent number: 8740327
    Abstract: A method for cleaning a carriage of an inkjet recording apparatus including a recording head configured to discharge ink to execute recording on a sheet, a conveyance unit configured to convey the sheet, a carriage configured to mount the recording head thereon and to move in a main-scanning direction crossing to a sheet conveyance direction, and a height change mechanism configured to move the carriage in a height direction includes moving the carriage in the main-scanning direction to the outside of a sheet conveyance area of the conveyance unit, conveying a cleaning sheet, to which a fold is previously given, to a recording position, moving the carriage to a first height position via the height change mechanism, moving the carriage to the inside of the sheet conveyance area, moving the carriage to a second height position via the height change mechanism, and conveying the cleaning sheet via the conveyance unit.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: June 3, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naohiro Iwata, Seiji Ogasawara, Hideaki Nagahara
  • Patent number: 8672441
    Abstract: An inkjet printing apparatus is provided which minimizes the amount of inks consumed for preventing the sedimentation of ejected inks on the platen ink absorber and which can effectively prevent the sedimentation of inks. To this end, a comparison is made between the ejected volume of easily sedimenting inks and the ejected volume of sedimentation restraining inks in terms of ink components. If the ejected volume of the sedimentation restraining inks is found not enough, a required amount of sedimentation restraining ink is additionally ejected.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: March 18, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Takahashi, Yuji Hamasaki, Kei Yoshizawa, Yoshinori Nakagawa, Nobuhiro Kitabatake, Seiji Ogasawara
  • Publication number: 20130300795
    Abstract: There is provided an inkjet printing apparatus which, even in a case where a landing position of ink changes due to a change in a distance between an ejection port of a print head and a support surface of a print medium, the print medium is conveyed by an appropriate conveyance amount. The inkjet printing apparatus detects a changing amount of the landing position of an ink droplet. The conveyance amount of the print medium by a conveying roller and a pinch roller is controlled based upon the detected changing amount.
    Type: Application
    Filed: April 24, 2013
    Publication date: November 14, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Seiji Ogasawara
  • Patent number: 8567905
    Abstract: An inkjet recording apparatus includes an upstream conveying unit that includes a conveying roller and a pinch roller that is in contact with the conveying roller at a position that is displaced downstream of the conveying roller in a conveying direction of a sheet; a recording head that is disposed downstream of the upstream conveying unit and that discharges liquid; a carriage that supports the recording head and scans in a direction that intersects the conveying direction; a platen that supports the sheet at a position facing the recording head; a downstream conveying unit disposed downstream of the carriage and that conveys the sheet; and a control unit that moves the carriage so that a liquid discharge port surface of the recording head is positioned outside a side edge of the sheet when a trailing end of the sheet passes a nip between the conveying roller and the pinch roller.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: October 29, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Seiji Ogasawara
  • Patent number: 8459766
    Abstract: A first rotator is provided on an upstream side of the carriage that holds a print head and a second rotator is provided on a downstream side of the carriage. The print head is allowed to move to a maintenance unit in a first state in which a sheet is in contact with both the first rotator and the second rotator during printing. The print head is not allowed to move to the maintenance unit in a second state in which the sheet is in contact with either one of the first rotator and the second rotator and the sheet is not in contact with the other rotator during printing.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: June 11, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shimpei Shinohara, Seiji Ogasawara, Atsushi Takahashi
  • Publication number: 20120050400
    Abstract: An inkjet printing apparatus is provided which minimizes the amount of inks consumed for preventing the sedimentation of ejected inks on the platen ink absorber and which can effectively prevent the sedimentation of inks. To this end, a comparison is made between the ejected volume of easily sedimenting inks and the ejected volume of sedimentation restraining inks in terms of ink components. If the ejected volume of the sedimentation restraining inks is found not enough, a required amount of sedimentation restraining ink is additionally ejected.
    Type: Application
    Filed: August 25, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Atsushi Takahashi, Yuji Hamasaki, Kei Yoshizawa, Yoshinori Nakagawa, Nobuhiro Kitabatake, Seiji Ogasawara
  • Publication number: 20120050406
    Abstract: An inkjet recording apparatus includes an upstream conveying unit that includes a conveying roller and a pinch roller that is in contact with the conveying roller at a position that is displaced downstream of the conveying roller in a conveying direction of a sheet; a recording head that is disposed downstream of the upstream conveying unit and that discharges liquid; a carriage that supports the recording head and scans in a direction that intersects the conveying direction; a platen that supports the sheet at a position facing the recording head; a downstream conveying unit disposed downstream of the carriage and that conveys the sheet; and a control unit that moves the carriage so that a liquid discharge port surface of the recording head is positioned outside a side edge of the sheet when a trailing end of the sheet passes a nip between the conveying roller and the pinch roller.
    Type: Application
    Filed: August 24, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Seiji Ogasawara
  • Publication number: 20120050361
    Abstract: A first rotator is provided on an upstream side of the carriage that holds a print head and a second rotator is provided on a downstream side of the carriage. The print head is allowed to move to a maintenance unit in a first state in which a sheet is in contact with both the first rotator and the second rotator during printing. The print head is not allowed to move to the maintenance unit in a second state in which the sheet is in contact with either one of the first rotator and the second rotator and the sheet is not in contact with the other rotator during printing.
    Type: Application
    Filed: August 23, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Shimpei Shinohara, Seiji Ogasawara, Atsushi Takahashi
  • Publication number: 20120051825
    Abstract: A printing apparatus capable of maintaining print sheet conveying performance while keeping apparatus cost low and apparatus size small is provided. The printing apparatus includes a conveying mechanism and a print unit. The conveying mechanism includes a conveying roller which is a driving roller, a plurality of pinch rollers which are passive rollers disposed facing the conveying roller, and a plurality of pinch roller axles supporting the pinch rollers. The print unit prints onto a sheet conveyed by the conveying rollers and the plurality of pinch rollers. The conveying mechanism includes one or more first pinch roller sets including two pinch rollers and a first pinch roller axle supporting the two pinch rollers, and one or more second pinch roller sets including three pinch rollers and a second pinch roller axle supporting the three pinch rollers.
    Type: Application
    Filed: August 23, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Seiji Ogasawara, Shimpei Shinohara
  • Patent number: 7284814
    Abstract: An ink jet printing apparatus, which enables high-grade printing to be carried out all over a print medium, includes a print medium conveying section for conveying a print medium, a scanning section for moving a print head that ejects ink droplets along a main scanning direction crossing a direction in which the print medium is conveyed, and a printing control section for controlling an operation performed by the print head to eject droplets. On the basis of a plurality of landing position adjustment values set in association with a plurality of areas in the conveying direction of the print medium, the printing control section controls the operation of ejecting ink droplets in each area.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: October 23, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Seiji Ogasawara
  • Patent number: 6899411
    Abstract: The present invention relates to a recording apparatus for recording an image by discharging an ink, and including a recording head capable of recording to at least one edge of recording medium without any margin, a receiving portion for receiving ink droplets discharged at a position extending beyond the edge of the recording medium, and a conveyance rotary body located at an upstream side of the receiving portion with respect to a conveyance direction of the recording medium. The conveyance rotary body is made conductive to an apparatus body.
    Type: Grant
    Filed: May 2, 2003
    Date of Patent: May 31, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takeji Niikura, Seiji Ogasawara
  • Patent number: 6886909
    Abstract: The present invention relates to an inkjet image forming apparatus capable of recording non-margin images on a recording medium by discharging ink from a recording head to regions within as well as beyond edges of the recording medium. The apparatus includes an ink absorbing material for receiving ink discharged at a position beyond the recording medium and a platen having a holding portion to hold the ink absorbing material and supporting the recording medium at a recording position. The holding section formed at the platen has an opening for receiving the ink and is formed with a wall for holding a periphery of the ink absorbing material and a rib supporting a bottom of the ink absorbing material.
    Type: Grant
    Filed: May 12, 2003
    Date of Patent: May 3, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Seiji Ogasawara
  • Publication number: 20050024417
    Abstract: It is an object of the present invention to provide an ink jet printing apparatus that enables high-grade printing to be carried out all over a print medium. An ink jet printing apparatus according to the present invention includes print medium conveying section for conveying a print medium, scanning section for moving a print head that ejects ink droplets, along a main scanning direction crossing a direction in which the print medium is conveyed, and printing control section for controlling an operation performed by the print head to eject droplets. On the basis of a plurality of landing position adjustment values set in association with a plurality of areas in the conveying direction of the print medium, the printing control section controls the operation of ejecting ink droplets in each area.
    Type: Application
    Filed: February 23, 2004
    Publication date: February 3, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventor: Seiji Ogasawara
  • Patent number: 6733009
    Abstract: An image forming apparatus for forming an image on a recording medium with a recording head, comprising a conveying roller pair for conveying the recording medium, discharging roller pairs for conveying the recording medium in the downstream of the conveying roller pair, and a stepping motor for driving the conveying roller pair and the discharging roller pairs. A peak value of driving current of the stepping motor after a trailing edge of the recording medium passes the conveying roller pair is smaller than a peak value of driving current of the stepping motor before the tailing edge of the recording medium passes the conveying roller pair.
    Type: Grant
    Filed: May 2, 2002
    Date of Patent: May 11, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Seiji Ogasawara
  • Publication number: 20040027441
    Abstract: The present invention relates to a recording apparatus recording an image by discharging an ink, comprising a recording means for being recordable to at least one edge of a recording medium without any margin, an receiving portion for receiving an ink droplet discharged at a position protruded from the recording medium, a conveyance rotary body located on an upstream side of the opening in a conveyance direction of the recording medium. The conveyance rotary body is made conductive to an apparatus body.
    Type: Application
    Filed: May 2, 2003
    Publication date: February 12, 2004
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takeji Niikura, Seiji Ogasawara
  • Publication number: 20030214549
    Abstract: The present invention relates to an inkjet image forming apparatus recordable of non-margin images on a recording medium by discharging ink to regions within as well as out of the recording medium from a recording means, comprising an ink absorbing material for receiving ink dischargeed at a position protruded from the recording medium and a platen having a holding portion to hold the ink absorbing material and supporting the recording medium at a recording position. The holding section formed at the platen has an opening for receiving the ink and is formed with a wall for holding a periphery of the ink absorbing material and a rib supporting a bottom of the ink absorbing material.
    Type: Application
    Filed: May 12, 2003
    Publication date: November 20, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventor: Seiji Ogasawara
  • Publication number: 20020175461
    Abstract: An image forming apparatus for forming an image on a recording medium with a recording head, comprising a conveying roller pair for conveying the recording medium, discharging roller pairs for conveying the recording medium in the downstream of the conveying roller pair, and a stepping motor for driving the conveying roller pair and the discharging roller pairs. A peak value of driving current of the stepping motor after a tailing edge of the recording medium passes the conveying roller pair is smaller than a peak value of driving current of the stepping motor before the tailing edge of the recording medium passes the conveying roller pair.
    Type: Application
    Filed: May 2, 2002
    Publication date: November 28, 2002
    Applicant: Canon Kabushiki Kaisha
    Inventor: Seiji Ogasawara
  • Patent number: 5899613
    Abstract: The present invention provides an image recording apparatus with an image recording unit for recording an image on a recording medium, a first conveyor for conveying the recording medium to an image recording portion of the image recording unit while bending the recording medium along a drive convey roller by means of the drive convey roller, and a second conveyor for conveying an elongated recording medium having a plurality of pin holes to the first conveyor. A guide capable of changing a contact area between the recording medium and the drive convey roller at a curved portion of the recording medium along the drive convey roller is also provided.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: May 4, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasushi Koike, Yoji Ara, Jun Katayanagi, Masaaki Kakizaki, Nozomu Nishiberi, Seiji Ogasawara
  • Patent number: 5880754
    Abstract: An ink jet recording apparatus for recording on a recording medium using an ink jet recording head that records by discharging ink from ink discharge ports thereof. The ink jet recording apparatus includes a carriage that carries the ink jet recording head and reciprocally moves the head in a manner such that the recording head is opposite the recording medium, and the carriage includes a temperature stabilization portion contactable with the ink jet recording head carried on the carriage, wherein the temperature stabilization portion radiates heat generated by the ink jet recording head.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: March 9, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takeji Niikura, Yoji Ara, Tsutomu Shimada, Shoichi Kan, Masaaki Kakizaki, Nozomu Nishiberi, Yasushi Koike, Seiji Ogasawara