Patents by Inventor Kuniaki Hirukawa
Kuniaki Hirukawa 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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Publication number: 20230273570Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: ApplicationFiled: May 8, 2023Publication date: August 31, 2023Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 11687029Abstract: [TASK] An object of the present invention is to provide an image developing apparatus and a process cartridge with which an image quality can be improved while reducing a number of parts and reducing an amount of remaining developer. [SOLUTION] A process cartridge detachably mountable to an electrophotographic image forming operators includes a developing chamber including a developing roller and a developer supplying roller; a developer accommodating container accommodating the developer provided below the developing chamber with respect to gravity direction, wherein the developer is fed into the developing chamber while being stirred by a feeding member. The developer supplying roller rotates such that a surface thereof moves in the same direction as a surface of the developing roller at a position where the developer supplying roller contacts the developing roller. A surface speed of the developer supplying roller is higher than a surface speed of the developing roller.Type: GrantFiled: November 11, 2021Date of Patent: June 27, 2023Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 11320782Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: GrantFiled: September 28, 2020Date of Patent: May 3, 2022Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 11314201Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: GrantFiled: September 28, 2020Date of Patent: April 26, 2022Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Publication number: 20220066386Abstract: An object of the present invention is to provide an image developing apparatus and a process cartridge with which an image quality can be improved while reducing a number of parts and reducing an amount of remaining developer. [SOLUTION] A process cartridge detachably mountable to an electrophotographic image forming operators includes a developing chamber including a developing roller and a developer supplying roller; a developer accommodating container accommodating the developer provided below the developing chamber with respect to gravity direction, wherein the developer is fed into the developing chamber while being stirred by a feeding member. The developer supplying roller rotates such that a surface thereof moves in the same direction as a surface of the developing roller at a position where the developer supplying roller contacts the developing roller. A surface speed of the developer supplying roller is higher than a surface speed of the developing roller.Type: ApplicationFiled: November 11, 2021Publication date: March 3, 2022Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 11226585Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: GrantFiled: September 28, 2020Date of Patent: January 18, 2022Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Publication number: 20210011428Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: ApplicationFiled: September 28, 2020Publication date: January 14, 2021Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuki, Yoshihiro Mitsui
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Publication number: 20210011429Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: ApplicationFiled: September 28, 2020Publication date: January 14, 2021Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 10838356Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: GrantFiled: November 26, 2019Date of Patent: November 17, 2020Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuki, Yoshihiro Mitsui
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Patent number: 10691063Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: GrantFiled: April 24, 2018Date of Patent: June 23, 2020Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Publication number: 20200096937Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: ApplicationFiled: November 26, 2019Publication date: March 26, 2020Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuki, Yoshihiro Mitsui
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Publication number: 20180239302Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: ApplicationFiled: April 24, 2018Publication date: August 23, 2018Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 9964921Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: GrantFiled: May 10, 2017Date of Patent: May 8, 2018Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 9933725Abstract: A developing device includes a developer storage chamber configured to store developer to be supplied to the development chamber, a partition configured to separate a development chamber and the developer storage chamber and having an opening allowing communication between the developer storage chamber and the development chamber, and a protruding portion configured to protrude toward the inside of the developer storage chamber from the partition on a downstream side of the opening in the rotation direction of a rotating shaft, and within one turn of rotation of the rotating shaft, a receiving member moves while contacting the protruding portion according to the rotation of the rotating shaft.Type: GrantFiled: February 27, 2017Date of Patent: April 3, 2018Assignee: Canon Kabushiki KaishaInventors: Yu Fukasawa, Hideki Maeshima, Kuniaki Hirukawa
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Publication number: 20170242396Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: ApplicationFiled: May 10, 2017Publication date: August 24, 2017Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 9696684Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.Type: GrantFiled: November 21, 2016Date of Patent: July 4, 2017Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
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Patent number: 9688008Abstract: A manufacturing method of a cartridge that is detachably mountable to an apparatus main assembly of an image forming apparatus. The manufacturing method includes a step of integrally molding a cartridge electrode with a frame in a manner such that a mold is contacted to the frame to form a space including a first portion for forming a first contact portion, a second portion for forming a second contact portion, and a connecting portion branching from an injection portion into the first portion and the second portion, and electroconductive resin is injected into the space.Type: GrantFiled: May 12, 2016Date of Patent: June 27, 2017Assignee: Canon Kabushiki KaishaInventors: Hiroshi Takarada, Kuniaki Hirukawa, Akira Suzuki, Nobuharu Hoshi, Yuichi Fukui
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Publication number: 20170168420Abstract: A developing device includes a developer storage chamber configured to store developer to be supplied to the development chamber, a partition configured to separate a development chamber and the developer storage chamber and having an opening allowing communication between the developer storage chamber and the development chamber, and a protruding portion configured to protrude toward the inside of the developer storage chamber from the partition on a downstream side of the opening in the rotation direction of a rotating shaft, and within one turn of rotation of the rotating shaft, a receiving member moves while contacting the protruding portion according to the rotation of the rotating shaft.Type: ApplicationFiled: February 27, 2017Publication date: June 15, 2017Inventors: Yu Fukasawa, Hideki Maeshima, Kuniaki Hirukawa
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Patent number: D790004Type: GrantFiled: June 2, 2015Date of Patent: June 20, 2017Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Masato Tanabe, Shuichi Gofuku, Hiroki Shimizu, Kuniaki Hirukawa
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Patent number: D790005Type: GrantFiled: June 2, 2015Date of Patent: June 20, 2017Assignee: Canon Kabushiki KaishaInventors: Hideki Maeshima, Masato Tanabe, Shuichi Gofuku, Hiroki Shimizu, Kuniaki Hirukawa