Patents by Inventor Toshio Ogiso
Toshio Ogiso 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).
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Patent number: 11927900Abstract: A fixing device includes a fixing rotator, a pressure rotator, a pressure plate, a pressing force, an entrance guide, an exit guide, and a transmission. The pressure rotator presses the fixing rotator to form a nip between the fixing rotator and the pressure rotator. The pressure plate rotates about a fulcrum to press the pressure rotator. The pressing force adjuster adjusts a pressing force of the pressure rotator. The entrance guide guides a recording medium entering the nip. The exit guide guides the recording medium ejected from the nip. The transmission transmits a displacement of the pressure plate to the entrance guide and the exit guide.Type: GrantFiled: December 28, 2022Date of Patent: March 12, 2024Assignee: Ricoh Company, Ltd.Inventors: Toshio Ogiso, Tamotsu Ikeda
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Publication number: 20230251592Abstract: A fixing device includes a fixing rotator, a pressure rotator, a pressure plate, a pressing force, an entrance guide, an exit guide, and a transmission. The pressure rotator presses the fixing rotator to form a nip between the fixing rotator and the pressure rotator. The pressure plate rotates about a fulcrum to press the pressure rotator. The pressing force adjuster adjusts a pressing force of the pressure rotator. The entrance guide guides a recording medium entering the nip. The exit guide guides the recording medium ejected from the nip. The transmission transmits a displacement of the pressure plate to the entrance guide and the exit guide.Type: ApplicationFiled: December 28, 2022Publication date: August 10, 2023Applicant: Ricoh Company, Ltd.Inventors: Toshio OGISO, Tamotsu IKEDA
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Publication number: 20230236533Abstract: A fixing device includes a fixing rotator, a pressure rotator, a pressure plate, a pressing force adjuster, an entrance guide, an exit guide, and a guide. The pressure rotator presses the fixing rotator to form a nip between the fixing rotator and the pressure rotator. The pressure plate rotates about a fulcrum to press the pressure rotator. The pressing force adjuster adjusts a pressing force of the pressure rotator. The entrance guide guides a recording medium entering the nip. The exit guide guides the recording medium ejected from the nip. The guide guides the pressure rotator in a direction inclined from a line connecting a rotation center of the fixing rotator and a rotation center of the pressure rotator toward downstream in a conveyance direction of the recording medium.Type: ApplicationFiled: December 8, 2022Publication date: July 27, 2023Applicant: Ricoh Company, Ltd.Inventors: Tamotsu IKEDA, Toshio Ogiso
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Patent number: 11703787Abstract: A fixing device includes a heater, a heating rotator, a nip formation rotator, and an entry guide. The entry guide guides each of a first recording medium having a predetermined length or more and a second recording medium having a length less than the predetermined length to the fixing nip. The entry guide includes a first and second entry guide portion. The first entry guide portion guides the first recording medium toward a harder one of the heating rotator and the nip formation rotator and has an opening. The second entry guide portion guides the second recording passing through the opening to the fixing nip along a reference line connecting an entry and exit of the fixing nip or guides the second recording medium from an area including a softer one of the heating rotator and the nip formation rotator with respect to the reference line to the fixing nip.Type: GrantFiled: April 19, 2022Date of Patent: July 18, 2023Assignee: Ricoh Company, Ltd.Inventors: Toshio Ogiso, Tamotsu Ikeda
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Publication number: 20220373950Abstract: A fixing device includes a heater, a heating rotator, a nip formation rotator, and an entry guide. The entry guide guides each of a first recording medium having a predetermined length or more and a second recording medium having a length less than the predetermined length to the fixing nip. The entry guide includes a first and second entry guide portion. The first entry guide portion guides the first recording medium toward a harder one of the heating rotator and the nip formation rotator and has an opening. The second entry guide portion guides the second recording passing through the opening to the fixing nip along a reference line connecting an entry and exit of the fixing nip or guides the second recording medium from an area including a softer one of the heating rotator and the nip formation rotator with respect to the reference line to the fixing nip.Type: ApplicationFiled: April 19, 2022Publication date: November 24, 2022Applicant: Ricoh Company, Ltd.Inventors: Toshio OGISO, Tamotsu IKEDA
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Patent number: 10078300Abstract: A fixing device includes a fixing rotator including a primary portion and a secondary portion disposed outboard from the primary portion in an axial direction of the fixing rotator. A pressure rotator contacts the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator, through which a recording medium is conveyed. A primary heater heats the primary portion of the fixing rotator. A secondary heater heats the secondary portion of the fixing rotator. A primary temperature detector is isolated from the fixing rotator and detects a temperature of the primary portion of the fixing rotator. A secondary temperature detector contacts the fixing rotator and detects a temperature of the secondary portion of the fixing rotator. The primary temperature detector has a thermal time constant that is smaller than a thermal time constant of the secondary temperature detector.Type: GrantFiled: October 9, 2017Date of Patent: September 18, 2018Assignee: Ricoh Company, Ltd.Inventors: Masahiro Samei, Toshio Ogiso, Tamotsu Ikeda, Shigeo Nanno
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Patent number: 10036987Abstract: A fixing device is removably installed inside an apparatus body including an apparatus guide. The fixing device includes a convex guide guided along the apparatus guide and a heater to heat a recording medium to fix a toner image on the recording medium. The heater includes a lateral end in a longitudinal direction of the heater. The lateral end is disposed inside the convex guide.Type: GrantFiled: August 14, 2017Date of Patent: July 31, 2018Assignee: Ricoh Company, Ltd.Inventors: Shigeo Nanno, Toshio Ogiso, Masahiro Samei, Tamotsu Ikeda
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Publication number: 20180107142Abstract: A fixing device includes a fixing rotator including a primary portion and a secondary portion disposed outboard from the primary portion in an axial direction of the fixing rotator. A pressure rotator contacts the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator, through which a recording medium is conveyed. A primary heater heats the primary portion of the fixing rotator. A secondary heater heats the secondary portion of the fixing rotator. A primary temperature detector is isolated from the fixing rotator and detects a temperature of the primary portion of the fixing rotator. A secondary temperature detector contacts the fixing rotator and detects a temperature of the secondary portion of the fixing rotator. The primary temperature detector has a thermal time constant that is smaller than a thermal time constant of the secondary temperature detector.Type: ApplicationFiled: October 9, 2017Publication date: April 19, 2018Inventors: Masahiro SAMEI, Toshio Ogiso, Tamotsu Ikeda, Shigeo Nanno
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Publication number: 20180067431Abstract: A fixing device is removably installed inside an apparatus body including an apparatus guide. The fixing device includes a convex guide guided along the apparatus guide and a heater to heat a recording medium to fix a toner image on the recording medium. The heater includes a lateral end in a longitudinal direction of the heater. The lateral end is disposed inside the convex guide.Type: ApplicationFiled: August 14, 2017Publication date: March 8, 2018Inventors: Shigeo NANNO, Toshio Ogiso, Masahiro Samei, Tamotsu Ikeda
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Patent number: 8874021Abstract: A mechanism for guiding a recording medium into a nip formed between a first rotary member subjected to heating, and a second rotary member pressed against the first rotary member includes a guide member and a biasing member. The guide member is disposed upstream from the nip to guide the recording medium therealong. The biasing member is connected to the guide member to mechanically bias the guide member. The guide member is subjected to a constant biasing force from the biasing member and to a pressure force from the recording medium. The pressure force is opposite the biasing force and variable with a stiffness of the recording medium being guided. The guide member is movable to different operational positions depending on the biasing and pressure forces acting thereon.Type: GrantFiled: June 28, 2012Date of Patent: October 28, 2014Assignee: Ricoh Company, Ltd.Inventors: Kohta Sakaya, Yasuhide Ohkubo, Tamotsu Ikeda, Yoshiharu Takahashi, Chikara Hiraoka, Toshio Ogiso
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Patent number: 8873988Abstract: A fixing device is operable through start-up and warm-up stages and has a rotatable fixing member to fix an unfixed toner image borne on a recording medium, an opposing member to press against the fixing member and form a nip on the fixing member, a temperature detector to detect temperature of the fixing member, and a heater controlled in accordance with the temperature of the fixing member to heat the fixing member. The heater is further controlled during the warm-up stage in accordance with at least one of if the fixing member is rotating and if the detected temperature has ever arrived at a prescribed target temperature in the warm-up stage.Type: GrantFiled: May 22, 2012Date of Patent: October 28, 2014Assignee: RICOH Company, Ltd.Inventors: Toshio Ogiso, Kohichi Ono, Akinobu Nakamura
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Patent number: 8588639Abstract: A fixing device is disclosed, including: a fixing rotative body, a heat source, and a control part. The control part conducts a printing temperature control which varies an ON ratio per unit time of the heat source based on a detection result of the temperature detecting part to maintain a printing target temperature in a printing state, conducts a waiting temperature control which performs an ON/OFF control based on the detection result of the temperature detecting part to maintain a waiting target temperature in a waiting state after a printing operation ends, and conducts a forcible ON control which forcibly turns on the heat source for a predetermined time before starting the ON/OFF control when the detection result of the temperature detecting part after the printing operation ends is lower than the waiting target temperature.Type: GrantFiled: January 14, 2011Date of Patent: November 19, 2013Assignee: Ricoh Company, Ltd.Inventors: Yoshiharu Takahashi, Toshio Ogiso
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Patent number: 8509644Abstract: A fixing device includes a temperature controller that controls a temperature of a fixing rotary body based on the temperature of the fixing rotary body detected by a temperature detector so as to heat the fixing rotary body to a plurality of preset target temperatures that includes a first target standby temperature, a target fixing temperature, a target idle temperature, and a second target standby temperature. When the target fixing temperature is lower than the first target standby temperature, the temperature controller separates a pressing rotary body from the fixing rotary body to idle the fixing rotary body for a predetermined idle time period before a fixing operation starts. After the fixing operation, the temperature controller controls a heater to change the temperature of the fixing rotary body to the second target standby temperature.Type: GrantFiled: August 1, 2011Date of Patent: August 13, 2013Assignee: Ricoh Company, Ltd.Inventors: Yoshiharu Takahashi, Toshio Ogiso
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Patent number: 8417137Abstract: A fixing device includes a rotary fixing member, a counter member to contact the rotary fixing member, a first heater to heat the rotary fixing member, a driving unit to rotate the rotary fixing member, a temperature detector to detect a temperature of the rotary fixing member, and a contact-and-separation unit to switch between contact and separation states of the rotary fixing member relative to the counter member. In a temperature-raising operation, the driving unit causes the rotary fixing member to rotate when the temperature detector detects that the temperature of the rotary fixing member has reached a first setting temperature. The contact-and-separation unit causes the rotary fixing member in rotation and the counter member to contact each other when the temperature detector detects that the temperature of the rotary fixing member has reached a second setting temperature that is higher than the first setting temperature.Type: GrantFiled: August 7, 2009Date of Patent: April 9, 2013Assignee: Ricoh Company LimitedInventors: Yutaka Naitoh, Toshio Ogiso, Tamotsu Ikeda
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Publication number: 20130004222Abstract: A mechanism for guiding a recording medium into a nip formed between a first rotary member subjected to heating, and a second rotary member pressed against the first rotary member includes a guide member and a biasing member. The guide member is disposed upstream from the nip to guide the recording medium therealong. The biasing member is connected to the guide member to mechanically bias the guide member. The guide member is subjected to a constant biasing force from the biasing member and to a pressure force from the recording medium. The pressure force is opposite the biasing force and variable with a stiffness of the recording medium being guided. The guide member is movable to different operational positions depending on the biasing and pressure forces acting thereon.Type: ApplicationFiled: June 28, 2012Publication date: January 3, 2013Applicant: RICOH COMPANY, LTD.Inventors: Kohta Sakaya, Yasuhide Ohkubo, Tamotsu Ikeda, Yoshiharu Takahashi, Chikara Hiraoka, Toshio Ogiso
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Publication number: 20120328318Abstract: A fixing device is operable through start-up and warm-up stages and has a rotatable fixing member to fix an unfixed toner image borne on a recording medium, an opposing member to press against the fixing member and form a nip on the fixing member, a temperature detector to detect temperature of the fixing member, and a heater controlled in accordance with the temperature of the fixing member to heat the fixing member. The heater is further controlled during the warm-up stage in accordance with at least one of if the fixing member is rotating and if the detected temperature has ever arrived at a prescribed target temperature in the warm-up stage.Type: ApplicationFiled: May 22, 2012Publication date: December 27, 2012Applicant: Ricoh Company, Ltd.Inventors: Toshio Ogiso, Kohichi Ono, Akinobu Nakamura
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Patent number: 8340543Abstract: A temperature control method for use in a fixing device that fixes a toner image on a recording sheet by passing the recording sheet through a fixing nip defined between a fixing member and a pressure member includes temperature detection, heater control, and duty control execution. The temperature detection detects a temperature of the fixing member with a temperature detector. The heater control controls operation of a heater of the fixing device by changing a duty thereof according to the detected temperature. The duty control execution executes a heater duty control to change a heater duty for a current control cycle discontinuously from that for a previous control cycle when the current control cycle precedes entry of the recording sheet into the fixing nip by a given period of time.Type: GrantFiled: May 19, 2009Date of Patent: December 25, 2012Assignee: Ricoh Company, Ltd.Inventors: Toshio Ogiso, Shin Yamamoto
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Patent number: 8301051Abstract: In a fixing apparatus, an internal temperature detection device is arranged within a heat generation region and detects temperature of a fixing device. An external temperature detection device is arranged at the outside of the heat generation region and detects temperature of the fixing device. Heat generation in the heat generating device is stopped when temperature reaches a prescribed first high temperature detection limit and a temperature rising amount in a prescribed time period after the first high temperature detection limit is reached exceeds a prescribed threshold.Type: GrantFiled: August 27, 2009Date of Patent: October 30, 2012Assignee: Ricoh Company, LimitedInventors: Toshio Ogiso, Shin Yamamoto
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Patent number: 8135298Abstract: An image forming apparatus, such as a printer, includes an image forming unit forming a toner image on an image carrier, a transfer unit for transferring the toner image onto a recording medium, a pair of a fusing rotating body and a pressure rotating body, a fusing unit for fusing the toner image on the recording medium, a temperature detecting unit for detecting the temperature on the surface of the fusing rotating body, and a control unit. An amount of decrease in the temperature of the fusing rotating body surface is measured at a predetermined time, and the time between an image formation request and the arrival of the recording medium, with the toner image formed thereon, at a fusing/nipping portion formed between the fusing rotating body and the pressure rotating body is extended when the temperature decrease amount is greater than a threshold value.Type: GrantFiled: October 23, 2008Date of Patent: March 13, 2012Assignee: Ricoh Company, Ltd.Inventors: Toshio Ogiso, Shin Yamamoto
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Publication number: 20120045241Abstract: A fixing device includes a temperature controller that controls a temperature of a fixing rotary body based on the temperature of the fixing rotary body detected by a temperature detector so as to heat the fixing rotary body to a plurality of preset target temperatures that includes a first target standby temperature, a target fixing temperature, a target idle temperature, and a second target standby temperature. When the target fixing temperature is lower than the first target standby temperature, the temperature controller separates a pressing rotary body from the fixing rotary body to idle the fixing rotary body for a predetermined idle time period before a fixing operation starts. After the fixing operation, the temperature controller controls a heater to change the temperature of the fixing rotary body to the second target standby temperature.Type: ApplicationFiled: August 1, 2011Publication date: February 23, 2012Inventors: Yoshiharu Takahashi, Toshio Ogiso