Patents by Inventor Shinichi Arasawa

Shinichi Arasawa 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: 10025228
    Abstract: A unit includes a part that is detachably attachable relative to an other unit, wherein the other unit includes an opening through which image forming powder is supplied from or received by the other unit, and a shutter that opens and closes the opening, and a collecting member that collects the image forming powder falling from at least one of the opening and the shutter by making contact with the shutter when detaching the unit from the other unit.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: July 17, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kohta Sakaya, Shinichi Arasawa
  • Publication number: 20170219965
    Abstract: A unit includes a part that is detachably attachable relative to an other unit, wherein the other unit includes an opening through which image forming powder is supplied from or received by the other unit, and a shutter that opens and closes the opening, and a collecting member that collects the image forming powder falling from at least one of the opening and the shutter by making contact with the shutter when detaching the unit from the other unit.
    Type: Application
    Filed: August 17, 2015
    Publication date: August 3, 2017
    Inventors: Kohta SAKAYA, Shinichi ARASAWA
  • Publication number: 20170219957
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Application
    Filed: April 18, 2017
    Publication date: August 3, 2017
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 9690231
    Abstract: A toner container includes a container body that is used to house a toner and that is detachably attachable to a mounting portion in a developing device; and an operating member that is used to open and close a shutter. The shutter as well as the operating member includes an engaging portion that can engage with a linking member which is disposed in the mounting portion and which can perform a reciprocating linear movement. In the state in which the container body is not mounted in the mounting portion, the shutter and the operating member are in a non-linked state with each other. In contrast, in the state in which the container body is mounted in the mounting portion, the shutter and the operating member become able to be linked to each other via the linking member.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: June 27, 2017
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Tomofumi Yoshida, Kohta Sakaya, Shinichi Arasawa, Jin Sam Park, Goo Chul Jung, Yasunobu Ogata
  • Patent number: 9405213
    Abstract: An optical-writing-head positioner includes a spacer disposed between a latent image bearer to bear a latent image and an optical writing head to expose the latent image bearer to light to form a latent image on a surface of the latent image bearer. The spacer positions the optical writing head with respect to the latent image bearer. The spacer includes plural contact faces with the latent image bearer in an axial direction of the latent image bearer. The plural contact faces include a contact face having an arc with a radius of curvature equal to or less than a radius of the latent image bearer and one of the a contact face having an arc with a radius of curvature greater than the radius of the latent image bearer and a flat contact face to contact the surface of the latent image bearer.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: August 2, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Shinichi Arasawa, Takahiro Yoshimi, Kenji Nakamura
  • Patent number: 9348309
    Abstract: An image forming apparatus includes a latent image bearer, a charging roller, a first cleaner, a second cleaner, and a rotation controller. The latent image bearer bears a latent image on a surface thereof. The charging roller charges the latent image bearer. The first cleaner cleans the surface of the latent image bearer. The second cleaner cleans a surface of the charging roller. The rotation controller controls the latent image bearer to execute a set of backward rotation and first forward rotation at least once during a non-image formation time period, and either temporarily stop and start second forward rotation or continuously execute the second forward rotation by a rotation distance corresponding to at least one rotation of the charging roller.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: May 24, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Masanari Fujita, Yasuhide Matsuno, Shin Murayama, Shin Yamamoto, Shinichi Arasawa
  • Publication number: 20160109827
    Abstract: A toner container includes a container body that is used to house a toner and that is detachably attachable to a mounting portion in a developing device; and an operating member that is used to open and close a shutter. The shutter as well as the operating member includes an engaging portion that can engage with a linking member which is disposed in the mounting portion and which can perform a reciprocating linear movement. In the state in which the container body is not mounted in the mounting portion, the shutter and the operating member are in a non-linked state with each other. In contrast, in the state in which the container body is mounted in the mounting portion, the shutter and the operating member become able to be linked to each other via the linking member.
    Type: Application
    Filed: May 30, 2014
    Publication date: April 21, 2016
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 9261816
    Abstract: A developer amount detector to detect an amount of developer inside a developer container includes a light-emitting element; a light-receiving element; a first light guide including a first end disposed to face the light-emitting element and a second end disposed inside the developer container, covered with a translucent cover including a light-emitting face; a second light guide including a first end disposed to face the light-receiving element, a second end disposed inside the developer container, covered with a translucent cover including a light-receiving face to face the light-emitting face across a gap; and a cleaner including a sliding portion to slidingly contact the light-emitting face and the light-receiving face. The cover of each of the first and second light guides includes a material lower in chargeability with the sliding portion than a material of a body of each of the first and second light guides.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: February 16, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Kohta Sakaya, Shinichi Arasawa, Yasuhide Ohkubo, Yasunobu Ogata
  • Publication number: 20160026111
    Abstract: An optical-writing-head positioner includes a spacer disposed between a latent image bearer to bear a latent image and an optical writing head to expose the latent image bearer to light to form a latent image on a surface of the latent image bearer. The spacer positions the optical writing head with respect to the latent image bearer. The spacer includes plural contact faces with the latent image bearer in an axial direction of the latent image bearer. The plural contact faces include a contact face having an arc with a radius of curvature equal to or less than a radius of the latent image bearer and one of the a contact face having an arc with a radius of curvature greater than the radius of the latent image bearer and a flat contact face to contact the surface of the latent image bearer.
    Type: Application
    Filed: July 23, 2015
    Publication date: January 28, 2016
    Applicant: RICOH COMPANY, LTD.
    Inventors: Shinichi ARASAWA, Yoshimi TAKAHIRO, Kenji NAKAMURA
  • Publication number: 20150234348
    Abstract: An image forming apparatus includes a latent image bearer, a charging roller, a first cleaner, a second cleaner, and a rotation controller. The latent image bearer bears a latent image on a surface thereof. The charging roller charges the latent image bearer. The first cleaner cleans the surface of the latent image bearer. The second cleaner cleans a surface of the charging roller. The rotation controller controls the latent image bearer to execute a set of backward rotation and first forward rotation at least once during a non-image formation time period, and either temporarily stop and start second forward rotation or continuously execute the second forward rotation by a rotation distance corresponding to at least one rotation of the charging roller.
    Type: Application
    Filed: February 10, 2015
    Publication date: August 20, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Masanari FUJITA, Yasuhide MATSUNO, Shin MURAYAMA, Shin YAMAMOTO, Shinichi ARASAWA
  • Publication number: 20150132018
    Abstract: A developer amount detector to detect an amount of developer inside a developer container includes a light-emitting element; a light-receiving element; a first light guide including a first end disposed to face the light-emitting element and a second end disposed inside the developer container, covered with a translucent cover including a light-emitting face; a second light guide including a first end disposed to face the light-receiving element, a second end disposed inside the developer container, covered with a translucent cover including a light-receiving face to face the light-emitting face across a gap; and a cleaner including a sliding portion to slidingly contact the light-emitting face and the light-receiving face. The cover of each of the first and second light guides includes a material lower in chargeability with the sliding portion than a material of a body of each of the first and second light guides.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 14, 2015
    Inventors: Kohta SAKAYA, Shinichi ARASAWA, Yasuhide OHKUBO, Yasunobu OGATA
  • Patent number: 8843005
    Abstract: A developing device includes a developing chamber; a toner carrier disposed in the developing chamber; a toner supply part configured to supply toner to the toner carrier; a toner amount detecting part configured to change its rotational position according to the amount of toner near the toner supply part to detect the amount of toner remaining in the developing chamber; and a toner flow restricting part configured to block movement of the toner around the toner amount detecting part which is caused by a flow of the toner in the developing chamber generated by the rotation of the toner supply part and the toner carrier.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: September 23, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomofumi Yoshida, Shinichi Arasawa
  • Patent number: 8768203
    Abstract: An image forming apparatus includes an exposure device as a light source, a developer container storing developer and attached to a main body of the image forming apparatus perpendicular to a lengthwise direction of the photoconductor, a developing unit and a photoconductor unit having a photoconductor for bearing a latent image thereon each detachably attached to the main body substantially in the same direction as the developer container. An exposure device displacing mechanism displaces the exposure device between a first position enabling the exposure device to function as the light source and a second position disabling the exposure device to function as the light source. The photoconductor unit is detached when the developer container is either displaced from an initially attached position or is removed from the main body and the exposure device displacing device has displaced the exposure device to the second position.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: July 1, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Manabu Hamada, Tomofumi Yoshida, Hirobumi Ooyoshi, Yoshiyuki Shimizu, Takeru Muramatsu, Tomohiro Kubota, Shinichi Arasawa, Shoh Tsuritani, Masanari Fujita, Tatsuo Fukushima, Nobuhiko Kita, Haruo Hashimoto
  • Patent number: 8526849
    Abstract: A process cartridge collectively accommodates at least a latent image carrier and a developer carrier carrying tonner for visualizing an electrostatic latent image formed on the latent image carrier and includes a side plate unit rotatably supporting the latent image carrier and the developer carrier. The side plate includes a bearing that rotatably supports a rotation shaft of the developer carrier; an elastic body that pushes the bearing against a rotation shaft of the latent image carrier; and a guiding unit that guides the bearing in a direction of the pushing. The guiding unit includes an abrasion preventing structure at a wall surface of the guiding unit that comes in contact with the bearing.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: September 3, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Tomofumi Yoshida, Hirobumi Ooyoshi, Yoshiyuki Shimizu, Shinichi Arasawa
  • Patent number: 8478162
    Abstract: A protruding portion that protrudes further toward a process cartridge than a contact portion coming in contact with a recording medium is provided at a contact terminal. A slide contact surface portion of the process cartridge is in a state of being in sliding contact with the protruding portion of the contact terminal by action of inserting the process cartridge, and the protruding portion is pressed in a direction being apart from the recording medium to limit contact between the contact terminal and the recording medium. The protruding portion fits in a fitting concave portion at a predetermined mounted position to make the contact terminal come in contact with the recording medium. The protruding portion is pulled out from the fitting concave portion by action of taking out the process cartridge to be in sliding contact with the slide contact surface portion.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: July 2, 2013
    Assignee: Ricoh Company, Limited
    Inventor: Shinichi Arasawa
  • Publication number: 20130136465
    Abstract: A developing device includes a developing chamber; a toner carrier disposed in the developing chamber; a toner supply part configured to supply toner to the toner carrier; a toner amount detecting part configured to change its rotational position according to the amount of toner near the toner supply part to detect the amount of toner remaining in the developing chamber; and a toner flow restricting part configured to block movement of the toner around the toner amount detecting part which is caused by a flow of the toner in the developing chamber generated by the rotation of the toner supply part and the toner carrier.
    Type: Application
    Filed: November 21, 2012
    Publication date: May 30, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomofumi YOSHIDA, Shinichi ARASAWA
  • Publication number: 20120114373
    Abstract: An image forming apparatus comprises a exposure device as a light source, a developer container storing developer and attached to a main body of the image forming apparatus perpendicular to a lengthwise direction of the photoconductor, a developing unit and a photoconductor unit having a photoconductor for bearing a latent image thereon each detachably attached to the main body substantially in the same direction as the developer container. An exposure device displacing mechanism displaces the exposure device between a first position enabling the exposure device to function as the light source and a second position disabling the exposure device to function as the light source. The photoconductor unit is detached when the developer container is either displaced from an initially attached position or is removed from the main body and the exposure device displacing device has displaced the exposure device to the second position.
    Type: Application
    Filed: November 7, 2011
    Publication date: May 10, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Manabu Hamada, Tomofumi Yoshida, Hirobumi Ooyoshi, Yoshiyuki Shimizu, Takeru Muramatsu, Tomohiro Kubota, Shinichi Arasawa, Shoh Tsuritani, Masanari Fujita, Tatsuo Fukushima, Nobuhiko Kita, Haruo Hashimoto
  • Publication number: 20110052256
    Abstract: A protruding portion that protrudes further toward a process cartridge than a contact portion coming in contact with a recording medium is provided at a contact terminal. A slide contact surface portion of the process cartridge is in a state of being in sliding contact with the protruding portion of the contact terminal by action of inserting the process cartridge, and the protruding portion is pressed in a direction being apart from the recording medium to limit contact between the contact terminal and the recording medium. The protruding portion fits in a fitting concave portion at a predetermined mounted position to make the contact terminal come in contact with the recording medium. The protruding portion is pulled out from the fitting concave portion by action of taking out the process cartridge to be in sliding contact with the slide contact surface portion.
    Type: Application
    Filed: August 20, 2010
    Publication date: March 3, 2011
    Inventor: Shinichi Arasawa
  • Publication number: 20110052255
    Abstract: A process cartridge collectively accommodates at least a latent image carrier and a developer carrier carrying tonner for visualizing an electrostatic latent image formed on the latent image carrier and includes a side plate unit rotatably supporting the latent image carrier and the developer carrier. The side plate includes a bearing that rotatably supports a rotation shaft of the developer carrier; an elastic body that pushes the bearing against a rotation shaft of the latent image carrier; and a guiding unit that guides the bearing in a direction of the pushing. The guiding unit includes an abrasion preventing structure at a wall surface of the guiding unit that comes in contact with the bearing.
    Type: Application
    Filed: August 20, 2010
    Publication date: March 3, 2011
    Inventors: Tomofumi Yoshida, Hirobumi Ooyoshi, Yoshiyuki Shimizu, Shinichi Arasawa
  • Patent number: D740357
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: October 6, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Shinichi Arasawa, Kohta Sakaya, Seong Ryeol Pyo, Kyo Sik Woo