Patents by Inventor Yoshio Hattori

Yoshio Hattori 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: 11256200
    Abstract: A fixing device is configured to be detachably attached to an image forming device main body. The fixing device includes a fixing member, a heating source, a pressing member, a conveyance guide member, an exterior member, a relay substrate, and a substrate covering member. The fixing member is configured to heat a toner image so as to fix the toner image on a recording medium. The heating source is configured to heat the fixing member. The pressing member is configured to press against the fixing member to form a nip part. The conveyance guide member is configured to guide the recording medium to the nip part. The exterior member houses at least the fixing member and the pressing member. The substrate covering member covers the relay substrate. The substrate covering member extends from and is integrated with the conveyance guide member.
    Type: Grant
    Filed: January 13, 2021
    Date of Patent: February 22, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takahiro Imada, Yoshio Hattori, Yoshikuni Sasaki, Hiromasa Takagi, Yasunori Ishigaya, Takumi Waida
  • Publication number: 20220043376
    Abstract: An image forming apparatus includes an image forming device that forms a toner image on a recording medium, a first rotator, and a second rotator that presses against the first rotator to form a nip therebetween. The first rotator conveys the recording medium bearing the toner image through the nip with a first orientation of the recording medium to fix the toner image on the recording medium to create a cleaning sheet bearing a cleaning image in a cleaning sheet creation mode. The first rotator conveys the cleaning sheet bearing the cleaning image through the nip with a second orientation of the cleaning sheet, that is different from the first orientation of the recording medium, such that the cleaning image is disposed opposite the first rotator to cause the cleaning image to remove a foreign substance from a surface of the first rotator in a cleaning mode.
    Type: Application
    Filed: July 27, 2021
    Publication date: February 10, 2022
    Inventors: Keitaro SHOJI, Yoshio HATTORI, Yoshikuni SASAKI, Takahiro IMADA, Hiromasa TAKAGI, Yasunori ISHIGAYA, Takumi WAIDA
  • Publication number: 20210223724
    Abstract: A fixing device is configured to be detachably attached to an image forming device main body. The fixing device includes a fixing member, a heating source, a pressing member, a conveyance guide member, an exterior member, a relay substrate, and a substrate covering member. The fixing member is configured to heat a toner image so as to fix the toner image on a recording medium. The heating source is configured to heat the fixing member. The pressing member is configured to press against the fixing member to form a nip part. The conveyance guide member is configured to guide the recording medium to the nip part. The exterior member houses at least the fixing member and the pressing member. The substrate covering member covers the relay substrate. The substrate covering member extends from and is integrated with the conveyance guide member.
    Type: Application
    Filed: January 13, 2021
    Publication date: July 22, 2021
    Inventors: Takahiro IMADA, Yoshio HATTORI, Yoshikuni SASAKI, Hiromasa TAKAGI, Yasunori ISHIGAYA, Takumi WAIDA
  • Patent number: 10852671
    Abstract: A fixing device includes a fixing rotator, a pressure rotator, a cleaner, and a moving assembly. The cleaner contacts and cleans a cleaning target, which includes one of the fixing rotator and the pressure rotator. The moving assembly moves the cleaner between a contact position at which the cleaner contacts the cleaning target and a separate position at which the cleaner is apart from the cleaning target. The moving assembly includes a biasing member that presses the cleaner to move to the contact position. The moving assembly moves the cleaner from the contact position to the separate position against a biasing force of the biasing member. The moving assembly moves the cleaner from the separate position to the contact position while increasing and then decreasing the biasing force of the biasing member greater than the biasing force applied when the cleaner is located at the contact position.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: December 1, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Takahiro Imada, Yoshio Hattori, Yoshikuni Sasaki, Hironori Yamaoka, Yasunori Ishigaya, Takumi Waida
  • Publication number: 20200249603
    Abstract: A fixing device includes a first rotator and a second rotator disposed opposite the first rotator. A heater heats one of the first rotator and the second rotator. A cleaner is disposed opposite the second rotator. A temperature detector is disposed opposite the second rotator at an opposed position being within an increased conveyance span where a first sheet is conveyed and being outboard from a decreased conveyance span in an axial direction of the second rotator where a second sheet smaller than the first sheet is conveyed. The temperature detector detects a temperature of the second rotator. A mover moves the cleaner between a contact position where the cleaner contacts the surface of the second rotator and a separation position where the cleaner separates from the surface of the second rotator based on the temperature of the second rotator, that is detected by the temperature detector.
    Type: Application
    Filed: December 26, 2019
    Publication date: August 6, 2020
    Inventors: Yasunori ISHIGAYA, Yoshio HATTORI, Yoshikuni SASAKI, Hironori YAMAOKA, Takahiro IMADA, Takumi WAIDA
  • Patent number: 10663894
    Abstract: A fixing device includes a fixing belt and a pressure rotator that presses against a nip formation pad via the fixing belt to form a fixing nip between the pressure rotator and the fixing belt. A first holder holds a first lateral end of the fixing belt in an axial direction thereof. A second holder holds a second lateral end of the fixing belt in the axial direction thereof. The second holder, together with the first holder, defines a holder interval provided between the first holder and the second holder in the axial direction of the fixing belt. A lubricant supplying sheet impregnated with a lubricant is sandwiched between the nip formation pad and the fixing belt at the fixing nip. The lubricant supplying sheet has a sheet span in the axial direction of the fixing belt. The sheet span is within the holder interval.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: May 26, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Jun Okamoto, Yoshio Hattori, Haruyuki Honda, Takumi Waida, Kiwako Hiroi, Yuusuke Furuichi, Tomoya Adachi
  • Publication number: 20200159149
    Abstract: A fixing device includes a fixing rotator, a pressure rotator, a cleaner, a moving assembly, and a temperature detector. The fixing rotator heats and fixes a toner image onto a recording medium. The pressure rotator presses against the fixing rotator. The cleaner contacts and cleans a cleaning target, which includes one of the fixing rotator and the pressure rotator. The moving assembly moves the cleaner between a contact position where the cleaner contacts the cleaning target and a separate position where the cleaner is apart from the cleaning target. The temperature detector detects a temperature of one of the cleaner and the cleaning target.
    Type: Application
    Filed: November 7, 2019
    Publication date: May 21, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Takumi WAIDA, Yoshio HATTORI, Yasunori ISHIGAYA, Yoshikuni SASAKI, Takahiro IMADA, Hironori YAMAOKA, Hiromasa TAKAGI, Keitaro SHOJI
  • Publication number: 20200159148
    Abstract: A fixing device includes a fixing rotator, a pressure rotator, a cleaner, and a moving assembly. The cleaner contacts and cleans a cleaning target, which includes one of the fixing rotator and the pressure rotator. The moving assembly moves the cleaner between a contact position at which the cleaner contacts the cleaning target and a separate position at which the cleaner is apart from the cleaning target. The moving assembly includes a biasing member that presses the cleaner to move to the contact position. The moving assembly moves the cleaner from the contact position to the separate position against a biasing force of the biasing member. The moving assembly moves the cleaner from the separate position to the contact position while increasing and then decreasing the biasing force of the biasing member greater than the biasing force applied when the cleaner is located at the contact position.
    Type: Application
    Filed: November 6, 2019
    Publication date: May 21, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Takahiro IMADA, Yoshio Hattori, Yoshikuni Sasaki, Hironori Yamaoka, Yasunori Ishigaya, Takumi Waida
  • Patent number: 10054885
    Abstract: A pressure and pressure relief device includes a rotator, a pressure body, a first pressure lever, and a biasing mechanism. The biasing mechanism includes a first elastic body, a second pressure lever, a cam, and a cam follower. A relations of L1>L3, L2>L4, and L3<L4 are satisfied. L1 represents a length between a first fulcrum of the first pressure lever and a point of load of the first pressure lever. L2 represents a length between the point of load of the first pressure lever and a hook portion of the first pressure lever. L3 represents a length between a pivot of the second pressure lever and a second fulcrum of the second pressure lever. L4 represents a length between the second fulcrum of the second pressure lever and a fastened portion of the second pressure lever.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: August 21, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Okamoto, Yoshio Hattori, Yuusuke Furuichi, Haruyuki Honda, Kiwako Hiroi, Kenichi Hasegawa
  • Publication number: 20180203384
    Abstract: A fixing device includes a fixing belt and a pressure rotator that presses against a nip formation pad via the fixing belt to form a fixing nip between the pressure rotator and the fixing belt. A first holder holds a first lateral end of the fixing belt in an axial direction thereof. A second holder holds a second lateral end of the fixing belt in the axial direction thereof. The second holder, together with the first holder, defines a holder interval provided between the first holder and the second holder in the axial direction of the fixing belt. A lubricant supplying sheet impregnated with a lubricant is sandwiched between the nip formation pad and the fixing belt at the fixing nip. The lubricant supplying sheet has a sheet span in the axial direction of the fixing belt. The sheet span is within the holder interval.
    Type: Application
    Filed: December 14, 2017
    Publication date: July 19, 2018
    Inventors: Jun OKAMOTO, Yoshio Hattori, Haruyuki Honda, Takumi Waida, Kiwako Hiroi, Yuusuke Furuichi, Tomoya Adachi
  • Patent number: 9989897
    Abstract: A fixing device includes a rotatable endless fixing belt, a pressure rotator, a nip formation pad, a lubricant impregnated member, and restrictors. The pressure rotator contacts an outer circumferential face of the fixing belt. The nip formation pad is disposed at an inner circumferential side of the fixing belt, to contact the pressure rotator via the fixing belt to form a nip. The lubricant impregnated member is disposed on the nip formation pad to contact an inner circumferential face of the fixing belt. The lubricant impregnated member is impregnated with lubricant. The restrictors, each disposed at an inner side than each end in a width direction of the fixing belt, regulate movement of the lubricant adhering to the fixing belt, toward each end of the fixing belt in the width direction. The restrictors have a lower absorbability of the lubricant than an absorbability of the lubricant impregnated member.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: June 5, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Okamoto, Hiroyuki Shimada, Yoshio Hattori, Haruyuki Honda
  • Publication number: 20170343942
    Abstract: A pressure and pressure relief device includes a rotator, a pressure body, a first pressure lever, and a biasing mechanism. The biasing mechanism includes a first elastic body, a second pressure lever, a cam, and a cam follower. A relations of L1>L3, L2>L4, and L3<L4 are satisfied. L1 represents a length between a first fulcrum of the first pressure lever and a point of load of the first pressure lever. L2 represents a length between the point of load of the first pressure lever and a hook portion of the first pressure lever. L3 represents a length between a pivot of the second pressure lever and a second fulcrum of the second pressure lever. L4 represents a length between the second fulcrum of the second pressure lever and a fastened portion of the second pressure lever.
    Type: Application
    Filed: May 24, 2017
    Publication date: November 30, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Jun Okamoto, Yoshio Hattori, Yuusuke Furuichi, Haruyuki Honda, Kiwako Hiroi, Kenichi Hasegawa
  • Patent number: 9811043
    Abstract: An image forming apparatus includes an image forming device to transfer an image to a recording sheet; a fixing device to feed the recording sheet and fix the image onto the recording sheet; a branching device to switch between an ejection path to eject the recording sheet fed downstream of the fixing device, to outside the apparatus, and a reversing path for duplex printing; and a back curl correction structure disposed in a sheet feeding path between the fixing device and the branching device. The back curl correction structure includes a drive roller; a driven roller; an auxiliary nip portion; a guide member; and a guide moving device to move the guide member to a first position and a second position depending on the condition of the recording sheet.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: November 7, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryuuichi Mimbu, Yoshio Hattori, Haruyuki Honda, Toshihiko Shimokawa, Yoshiki Yamaguchi
  • Patent number: 9811029
    Abstract: A fixing device has a flexible endless fixing member; a heater to heat the fixing member; a nip forming member to contact the fixing member directly or via a slide member; a pressure member, rotatably disposed opposite the fixing member and the nip forming member; and a back curl correction structure that includes a drive roller disposed on a side where a back curl appears in the recording sheet; a driven roller disposed opposite the drive roller; an auxiliary nip portion to feed the recording sheet; a guide member to guide the recording sheet fed out from the auxiliary nip portion to bend in a direction opposite a curled direction of the back curl of the recording sheet. A driving connection between the drive roller and the pressure member is performed by a connection between a drive roller side connection gear and a pressure member side connection gear.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: November 7, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruyuki Honda, Ryuuichi Mimbu, Yoshio Hattori, Yoshiki Yamaguchi, Toshihiko Shimokawa
  • Patent number: 9753417
    Abstract: A fixing device includes an endless fixing belt; a pressure roller to contact the fixing belt; a nip forming member to press the pressure roller from the fixing belt; a nip portion formed between the fixing belt and the pressure roller; a heater to heat the fixing belt to fuse and fix toner onto a recording sheet in the nip portion; an auxiliary driven roller; an auxiliary drive roller to drive the driven roller; an auxiliary nip portion, formed between an outer circumferential surface of the auxiliary driven roller and an outer circumferential surface of the auxiliary drive roller, to nip the recording sheet after toner fixation conveyed from the nip portion; and an outlet guide member, disposed downstream of the auxiliary nip portion, to guide the recording sheet after toner fixation conveyed from the auxiliary nip portion, with the toner-fixed recording sheet surface bent in a concave shape.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: September 5, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiki Yamaguchi, Yoshio Hattori, Haruyuki Honda, Ryuuichi Mimbu, Toshihiko Shimokawa, Yutaka Ikebuchi, Yasunori Ishigaya, Kazuya Saito, Keitaro Shoji, Ryohei Matsuda
  • Patent number: 9696668
    Abstract: A fixing device includes a fixing member; a heater to heat the fixing member; a nip forming member to contact the fixing member; and a pressure member, disposed opposite the nip forming member to press against the fixing member to form a fixing nip portion together with the nip forming member. The fixing device applies heat and pressure to fix an image transferred to a recording sheet when the recording sheet passes through the fixing nip. The nip forming member includes a first and second planar portions disposed at an upstream end and a downstream end, respectively, of the fixing nip portion, and the first planar portion and the second planar portion are continuous with a curved portion of the nip forming member. A guide member guides the recording sheet to bend in a direction opposite a back curl of the recording sheet generated in the fixing nip portion.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: July 4, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yoshiki Yamaguchi, Yoshio Hattori, Ryuuichi Mimbu, Haruyuki Honda, Toshihiko Shimokawa
  • Publication number: 20170176899
    Abstract: A fixing device includes a rotatable endless fixing belt, a pressure rotator, a nip formation pad, a lubricant impregnated member, and restrictors. The pressure rotator contacts an outer circumferential face of the fixing belt. The nip formation pad is disposed at an inner circumferential side of the fixing belt, to contact the pressure rotator via the fixing belt to form a nip. The lubricant impregnated member is disposed on the nip formation pad to contact an inner circumferential face of the fixing belt. The lubricant impregnated member is impregnated with lubricant. The restrictors, each disposed at an inner side than each end in a width direction of the fixing belt, regulate movement of the lubricant adhering to the fixing belt, toward each end of the fixing belt in the width direction. The restrictors have a lower absorbability of the lubricant than an absorbability of the lubricant impregnated member.
    Type: Application
    Filed: December 14, 2016
    Publication date: June 22, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Jun Okamoto, Hiroyuki Shimada, Yoshio Hattori, Haruyuki Honda
  • Patent number: 9581945
    Abstract: A fixing exit guide plate for use in a fixing device, which supports the conveyance of a paper while being curved in a direction opposite to a curl direction of the paper in a paper conveyance path downstream of conveyance support rollers, includes a conveyance downstream portion having a paper conveyance plane and a conveyance upstream portion having a paper conveyance plane, wherein the fixing exit guide plate is retracted in a paper jam process to move such that the paper conveyance plane of the conveyance downstream portion rotates about a rotation axis of the conveyance support driving roller to be substantially parallel to the paper conveyance plane of a conveyance upstream portion.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: February 28, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Haruyuki Honda, Ryuuichi Mimbu, Yoshio Hattori, Yoshiki Yamaguchi, Toshihiko Shimokawa
  • Patent number: 9529308
    Abstract: An image forming apparatus includes a fixing rotator and an opposed rotator pressed against the fixing rotator to form a fixing nip therebetween, through which a recording medium bearing a toner image is conveyed. A heater heats the fixing rotator. A temperature sensor contacts the opposed rotator to detect a temperature of the opposed rotator. A conveyor conveys the recording medium to the fixing nip. A driver drives the conveyor. A controller, operatively connected to the temperature sensor and the driver, controls the driver to drive the conveyor to convey the recording medium to the fixing nip based on the temperature of the opposed rotator detected by the temperature sensor. The controller causes the driver to be ready to drive the conveyor when a change in the detected temperature of the opposed rotator per unit time reaches a predetermined threshold.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: December 27, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Yutaka Ikebuchi, Yoshio Hattori, Ryuuichi Mimbu, Yasunori Ishigaya, Yoshiki Yamaguchi, Kazuya Saito, Toshihiko Shimokawa, Keitaro Shoji
  • Patent number: 9501006
    Abstract: A fixing device includes a heater that heats a fixing rotator and includes a first heating portion and a second heating portion substantially aligned with the first heating portion in an axial direction of the fixing rotator. A multi-view thermopile array detects a temperature of an outer circumferential surface of the fixing rotator at a plurality of spots thereon. A heater controller controls the first heating portion and the second heating portion individually based on the temperature of the fixing rotator detected at the plurality of spots thereon. A recording medium conveyance controller determines whether or not to convey the recording medium to the fixing nip based on an increased temperature detected at at least one of the plurality of spots on the fixing rotator.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: November 22, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshihiko Shimokawa, Ryuuichi Mimbu, Kazuya Saito, Haruyuki Honda, Yoshiki Yamaguchi, Yasunori Ishigaya, Yoshio Hattori