Patents by Inventor Haruki Nagata

Haruki Nagata 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: 10401764
    Abstract: A cam drive device includes a cam to rotate; a displacement body to be displaced in response to a change in a rotation position of the cam in contact with the displacement body; a motor to rotate the cam; and a power source to output an electric current to be supplied to the motor. An electric current to cause a stall torque to the motor being a stop state is changed in response to a change in a rotation stop position of the cam.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: September 3, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruki Nagata, Ryo Hasegawa, Atsushi Nagata, Kenji Honjoh
  • Patent number: 10261450
    Abstract: An image forming apparatus includes an apparatus body, a plurality of image bearers, an endless belt, a contact and separation mechanism to generate a first trajectory and a second trajectory of the endless belt, a sensor to detect an object on a surface of the endless belt, and a positioning mechanism to enable the sensor to detect the object in the first trajectory and the second trajectory of the endless belt. The positioning mechanism includes a stay to support the sensor, a first bracket, a second bracket, a first positioning portion attached to the apparatus body to position the sensor in a direction of rotation of the first bracket and the second bracket at a time of the first trajectory, and a second positioning portion attached to the second bracket to position the sensor in the direction of rotation of the first bracket at a time of the second trajectory.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: April 16, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryo Hasegawa, Kenji Honjoh, Atsushi Nagata, Haruki Nagata
  • Publication number: 20190025735
    Abstract: An image forming apparatus includes an apparatus body, a plurality of image bearers, an endless belt, a contact and separation mechanism to generate a first trajectory and a second trajectory of the endless belt, a sensor to detect an object on a surface of the endless belt, and a positioning mechanism to enable the sensor to detect the object in the first trajectory and the second trajectory of the endless belt. The positioning mechanism includes a stay to support the sensor, a first bracket, a second bracket, a first positioning portion attached to the apparatus body to position the sensor in a direction of rotation of the first bracket and the second bracket at a time of the first trajectory, and a second positioning portion attached to the second bracket to position the sensor in the direction of rotation of the first bracket at a time of the second trajectory.
    Type: Application
    Filed: June 21, 2018
    Publication date: January 24, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Ryo HASEGAWA, Kenji HONJOH, Atsushi NAGATA, Haruki NAGATA
  • Publication number: 20180164720
    Abstract: A cam drive device includes a cam to rotate; a displacement body to be displaced in response to a change in a rotation position of the cam in contact with the displacement body; a motor to rotate the cam; and a power source to output an electric current to be supplied to the motor. An electric current to cause a stall torque to the motor being a stop state is changed in response to a change in a rotation stop position of the cam.
    Type: Application
    Filed: December 6, 2017
    Publication date: June 14, 2018
    Applicant: Ricoh Company, Ltd.
    Inventors: Haruki Nagata, Ryo Hasegawa, Atsushi Nagata, Kenji Honjoh
  • Patent number: 9519245
    Abstract: An image forming apparatus includes an image bearer, a nip forming device, a contact-and-separation device, a thickness information retrieving device, and a controller. The contact-and-separation device moves the image bearer and the nip forming device to contact and separate from each other. The controller controls the contact-and-separation device based on information on a thickness of a recording medium obtained by the thickness information retrieving device such that in a case in which a thickness of a preceding recording medium and a thickness of a successive recording medium are different in continuous printing in which a plurality of recording media is printed out continuously, the contact-and-separation device adjusts a space between the image bearer and the nip forming device when the preceding recording medium exits the transfer nip to a preset size corresponding to the thickness of the successive recording medium that enters the transfer nip.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: December 13, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruki Nagata, Ryo Hasegawa, Naoto Kochi, Atsushi Nagata, Takahiro Konishi
  • Patent number: 9395659
    Abstract: An image forming apparatus includes an image carrier that carries a toner image; a transfer member that forms a transfer nip between the transfer member and the image carrier; and a power supply capable of outputting a superimposed transfer bias in which an alternating current component is superimposed onto a direct current component. The toner image on the image carrier is transferred onto a recording medium in the transfer nip by the superimposed transfer bias or a direct current bias consisting of the direct current component output by the power supply. The apparatus also includes a controller that controls the power supply so that an output target value of the direct current component when the direct current component rises up is larger than an output target value of the direct current component when the toner image is transferred onto the recording medium.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: July 19, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Shinya Tanaka, Hirokazu Ishii, Tsutomu Kato, Yasufumi Takahashi, Takehide Mizutani, Osamu Ichihashi, Yuji Kato, Atsushi Nagata, Kazuosa Kuma, Ryo Hasegawa, Haruki Nagata, Naoto Kochi
  • Publication number: 20150346643
    Abstract: The transfer assembly includes a belt, a transfer device, a contact-and-separation device including a retainer, and a first vibration absorber. The transfer device contacts an image bearer via the belt to form a transfer nip portion between the image bearer and the belt and to transfer the toner image onto one of a surface of the belt and a recording medium carried on the surface of the belt. The contact-and-separation device moves the transfer device to contact and separate from the image bearer. The retainer is pivotally supported by a swingable shaft and movable in a first direction in which the transfer device approaches the image bearer and in a second direction opposite to the first direction in which the transfer device separates from the image bearer, to hold the transfer device. The first vibration absorber absorbs vibration transmitted from the swingable shaft to the transfer device via the retainer.
    Type: Application
    Filed: May 28, 2015
    Publication date: December 3, 2015
    Inventors: Takahiro KONISHI, Ryo Hasegawa, Kazuosa Kuma, Susumu Mikajiri, Marutomo Goto, Haruki Nagata
  • Publication number: 20150346651
    Abstract: An image forming apparatus includes an image bearer, a nip forming device, a contact-and-separation device, a thickness information retrieving device, and a controller. The contact-and-separation device moves the image bearer and the nip forming device to contact and separate from each other. The controller controls the contact-and-separation device based on information on a thickness of a recording medium obtained by the thickness information retrieving device such that in a case in which a thickness of a preceding recording medium and a thickness of a successive recording medium are different in continuous printing in which a plurality of recording media is printed out continuously, the contact-and-separation device adjusts a space between the image bearer and the nip forming device when the preceding recording medium exits the transfer nip to a preset size corresponding to the thickness of the successive recording medium that enters the transfer nip.
    Type: Application
    Filed: May 14, 2015
    Publication date: December 3, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Haruki NAGATA, Ryo HASEGAWA, Naoto KOCHI, Atsushi NAGATA, Takahiro KONISHI
  • Publication number: 20140328604
    Abstract: An image forming apparatus includes an image carrier that carries a toner image; a transfer member that forms a transfer nip between the transfer member and the image carrier; and a power supply capable of outputting a superimposed transfer bias in which an alternating current component is superimposed onto a direct current component. The toner image on the image carrier is transferred onto a recording medium in the transfer nip by the superimposed transfer bias or a direct current bias consisting of the direct current component output by the power supply. The apparatus also includes a controller that controls the power supply so that an output target value of the direct current component when the direct current component rises up is larger than an output target value of the direct current component when the toner image is transferred onto the recording medium.
    Type: Application
    Filed: April 23, 2014
    Publication date: November 6, 2014
    Inventors: Shinya TANAKA, Hirokazu Ishii, Tsutomu Kato, Yasufumi Takahashi, Takehide Mizutani, Osamu Ichihashi, Yuji Kato, Atsushi Nagata, Kazuosa Kuma, Ryo Hasegawa, Haruki Nagata, Naoto Kochi