Patents by Inventor Tsugunao Toyooka

Tsugunao Toyooka 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: 10669109
    Abstract: A sheet end position regulating device, which is included in an image forming apparatus, includes a first contact body disposed movable on a sheet loading portion on which a sheet is loaded and configured to contact an end portion of the sheet, a fixing body disposed movable between a fixing position at which a position of the first contact body to the sheet loading portion is fixed and a releasing position at which the position of the first contact body is released, and a second contact body disposed movable between a contact position at which the fixing body contacts a contact target portion to regulate movement of the fixing body form the fixing position to the releasing position and a non-contact position at which the fixing body does not contact the contact target portion.
    Type: Grant
    Filed: October 17, 2018
    Date of Patent: June 2, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tsugunao Toyooka, Masayuki Ueda, Hideki Tobinaga, Hajime Nishida
  • Publication number: 20190193968
    Abstract: A sheet end position regulating device, which is included in an image forming apparatus, includes a first contact body disposed movable on a sheet loading portion on which a sheet is loaded and configured to contact an end portion of the sheet, a fixing body disposed movable between a fixing position at which a position of the first contact body to the sheet loading portion is fixed and a releasing position at which the position of the first contact body is released, and a second contact body disposed movable between a contact position at which the fixing body contacts a contact target portion to regulate movement of the fixing body form the fixing position to the releasing position and a non-contact position at which the fixing body does not contact the contact target portion.
    Type: Application
    Filed: October 17, 2018
    Publication date: June 27, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Tsugunao TOYOOKA, Masayuki UEDA, Hideki TOBINAGA, Hajime NISHIDA
  • Patent number: 8857809
    Abstract: A sheet separation/conveyance device that is included in an image forming apparatus includes an attraction/separation unit including an endless belt on which a region of attraction and a region of no attraction that divides the region of attraction are aligned in a sheet conveying direction, the endless belt configured to hold an uppermost sheet placed on top of a sheet stack contained in an image forming apparatus by using electrostatic attraction, a charger configured to charge a surface of the endless belt, the charger including an electrode configured to contact the surface of the endless belt due to a supply of a voltage and a detector configured to detect a charged condition on the surface of the endless belt based on a detection result obtained when the electrode contacts the endless belt, and a sheet conveying unit configured to convey the uppermost sheet held by the electrostatic attraction.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: October 14, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsugunao Toyooka, Manabu Nonaka, Yoshikuni Ishikawa, Satoshi Kuno
  • Patent number: 8833755
    Abstract: A sheet feeding device incorporable in an image forming apparatus includes a sheet holder to hold multiple sheets including an uppermost sheet placed on the sheet holder, a sheet separating and feeding unit disposed above the sheet holder and movable between a first position and a second position, a controller to control operations performed by the sheet separating and feeding unit moving between the first position and the second position, and a sheet regulator disposed downstream from the sheet holder in the sheet feeding direction to regulate movement of the multiple sheets on the sheet holder in the sheet feeding direction. The controller controls the separating and feeding unit to move the uppermost sheet forward to abut against the sheet regulator and backward to its original position on the sheet holder to separate the uppermost sheet from the multiple sheets on the sheet holder.
    Type: Grant
    Filed: July 15, 2010
    Date of Patent: September 16, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsugunao Toyooka, Manabu Nonaka
  • Patent number: 8752821
    Abstract: An image forming apparatus includes an image forming device to form an image on a sheet and a sheet feeding unit to feed the sheet to the image forming device. The sheet feeding unit includes an endless, dielectric belt disposed facing an upper surface of a sheet stack to contact and attract an uppermost sheet to the surface thereof and feed the sheet in the sheet feeding direction, and an electric potential pattern forming unit to form an electric potential pattern on the surface of the dielectric belt. The electric potential pattern has multiple potential holding sections of identical absolute values and opposite polarities disposed adjacent to each other at a uniform pitch. The electric potential pattern forming unit forms the electric potential pattern to have equal numbers of positive potential holding sections and negative potential holding sections.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: June 17, 2014
    Assignee: Ricoh Company, Limited
    Inventors: Tsugunao Toyooka, Manabu Nonaka, Kazunori Bannai
  • Publication number: 20140070479
    Abstract: A sheet separation/conveyance device that is included in an image forming apparatus includes an attraction/separation unit including an endless belt on which a region of attraction and a region of no attraction that divides the region of attraction are aligned in a sheet conveying direction, the endless belt configured to hold an uppermost sheet placed on top of a sheet stack contained in an image forming apparatus by using electrostatic attraction, a charger configured to charge a surface of the endless belt, the charger including an electrode configured to contact the surface of the endless belt due to a supply of a voltage and a detector configured to detect a charged condition on the surface of the endless belt based on a detection result obtained when the electrode contacts the endless belt, and a sheet conveying unit configured to convey the uppermost sheet held by the electrostatic attraction.
    Type: Application
    Filed: September 3, 2013
    Publication date: March 13, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tsugunao TOYOOKA, Manabu NONAKA, Yoshikuni ISHIKAWA, Satoshi KUNO
  • Patent number: 8408532
    Abstract: An image forming apparatus includes an image forming device, a sheet feeding unit, a belt pressing member, and a moving unit. The sheet feeding unit includes an endless, dielectric belt to contact and attract the uppermost sheet to a surface thereof and feed in a sheet feeding direction, and an electric potential pattern forming unit to form an electric potential pattern on a surface of the dielectric belt. The moving unit moves the belt pressing member between a sheet attracting position and a sheet feeding position. The dielectric belt attracts the uppermost sheet at the sheet attracting position, the moving unit moves the belt pressing member to the sheet feeding position, and an entire flat portion of the dielectric belt feeds the uppermost sheet in the sheet feeding direction while carrying the uppermost sheet thereon as the dielectric belt rotates.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: April 2, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideto Higaki, Manabu Nonaka, Tsugunao Toyooka
  • Patent number: 8302953
    Abstract: A sheet separating and feeding unit incorporable in an image forming apparatus includes an image forming device, a sheet container, a sheet feeding unit including an endless, dielectric belt and an electric potential pattern forming unit, a belt supporting mechanism including a first supporting roller and a second supporting roller, and a moving unit. The first supporting roller rotates to rotatably move the second supporting roller between a sheet attracting position and a sheet feeding position so that the flat portion of the dielectric belt moves between the sheet contact position and the sheet pick-up position.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: November 6, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Toshifumi Togashi, Manabu Nonaka, Hideto Higaki, Tsugunao Toyooka
  • Patent number: 8157257
    Abstract: A sheet feeding device incorporable in an image forming apparatus includes a sheet holder to hold a stack of sheets including an uppermost sheet, an endless belt, a charging member, a belt supporting unit including a drive roller and a driven roller, a moving mechanism to move the sheet holder, and a controller. The controller alternately controls the moving mechanism to move the sheet holder to a proximal position, the endless belt to contact the uppermost sheet held on the sheet holder, and the driven roller to rotate about the drive roller, to attract the uppermost sheet, and controls the moving mechanism to move the sheet holder to a distal position, the driven roller to rotate about the drive roller, and the endless belt to incline at a predetermined angle of separation, to separate the uppermost sheet from the multiple sheets.
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: April 17, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsugunao Toyooka, Manabu Nonaka, Toshifumi Togashi, Hideto Higaki
  • Publication number: 20110062651
    Abstract: An image forming apparatus includes an image forming device, a sheet feeding unit, a belt pressing member, and a moving unit. The sheet feeding unit includes an endless, dielectric belt to contact and attract the uppermost sheet to a surface thereof and feed in a sheet feeding direction, and an electric potential pattern forming unit to form an electric potential pattern on a surface of the dielectric belt. The moving unit moves the belt pressing member between a sheet attracting position and a sheet feeding position. The dielectric belt attracts the uppermost sheet at the sheet attracting position, the moving unit moves the belt pressing member to the sheet feeding position, and an entire flat portion of the dielectric belt feeds the uppermost sheet in the sheet feeding direction while carrying the uppermost sheet thereon as the dielectric belt rotates.
    Type: Application
    Filed: September 1, 2010
    Publication date: March 17, 2011
    Applicant: Ricoh Company, Ltd.
    Inventors: Hideto Higaki, Manabu Nonaka, Tsugunao Toyooka
  • Publication number: 20110062655
    Abstract: A sheet separating and feeding unit incorporable in an image forming apparatus includes an image forming device, a sheet container, a sheet feeding unit including an endless, dielectric belt and an electric potential pattern forming unit, a belt supporting mechanism including a first supporting roller and a second supporting roller, and a moving unit. The first supporting roller rotates to rotatably move the second supporting roller between a sheet attracting position and a sheet feeding position so that the flat portion of the dielectric belt moves between the sheet contact position and the sheet pick-up position.
    Type: Application
    Filed: August 24, 2010
    Publication date: March 17, 2011
    Inventors: Toshifumi Togashi, Manabu Nonaka, Hideto Higaki, Tsugunao Toyooka
  • Publication number: 20110052227
    Abstract: An image forming apparatus includes an image forming device to form an image on a sheet and a sheet feeding unit to feed the sheet to the image forming device. The sheet feeding unit includes an endless, dielectric belt disposed facing an upper surface of a sheet stack to contact and attract an uppermost sheet to the surface thereof and feed the sheet in the sheet feeding direction, and an electric potential pattern forming unit to form an electric potential pattern on the surface of the dielectric belt. The electric potential pattern has multiple potential holding sections of identical absolute values and opposite polarities disposed adjacent to each other at a uniform pitch. The electric potential pattern forming unit forms the electric potential pattern to have equal numbers of positive potential holding sections and negative potential holding sections.
    Type: Application
    Filed: August 30, 2010
    Publication date: March 3, 2011
    Inventors: Tsugunao Toyooka, Manabu Nonaka, Kazunori Bannai
  • Publication number: 20110024971
    Abstract: A sheet feeding device incorporable in an image forming apparatus includes a sheet holder to hold multiple sheets including an uppermost sheet placed on the sheet holder, a sheet separating and feeding unit disposed above the sheet holder and movable between a first position and a second position, a controller to control operations performed by the sheet separating and feeding unit moving between the first position and the second position, and a sheet regulator disposed downstream from the sheet holder in the sheet feeding direction to regulate movement of the multiple sheets on the sheet holder in the sheet feeding direction. The controller controls the separating and feeding unit to move the uppermost sheet forward to abut against the sheet regulator and backward to its original position on the sheet holder to separate the uppermost sheet from the multiple sheets on the sheet holder.
    Type: Application
    Filed: July 15, 2010
    Publication date: February 3, 2011
    Inventors: Tsugunao Toyooka, Manabu Nonaka
  • Publication number: 20100296851
    Abstract: A sheet feeding device incorporable in an image forming apparatus includes a sheet holder to hold a stack of sheets including an uppermost sheet, an endless belt, a charging member, a belt supporting unit including a drive roller and a driven roller, a moving mechanism to move the sheet holder, and a controller. The controller alternately controls the moving mechanism to move the sheet holder to a proximal position, the endless belt to contact the uppermost sheet held on the sheet holder, and the driven roller to rotate about the drive roller, to attract the uppermost sheet, and controls the moving mechanism to move the sheet holder to a distal position, the driven roller to rotate about the drive roller, and the endless belt to incline at a predetermined angle of separation, to separate the uppermost sheet from the multiple sheets.
    Type: Application
    Filed: May 19, 2010
    Publication date: November 25, 2010
    Inventors: Tsugunao Toyooka, Manabu Nonaka, Toshifumi Togashi, Hideto Higaki