Patents by Inventor Kazuhiko Yuuki
Kazuhiko Yuuki 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: 7289748Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: GrantFiled: December 21, 2005Date of Patent: October 30, 2007Assignee: Ricoh Company, Ltd.Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Patent number: 7218880Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: GrantFiled: April 23, 2004Date of Patent: May 15, 2007Assignee: Ricoh Company, Ltd.Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Publication number: 20060099006Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: ApplicationFiled: December 21, 2005Publication date: May 11, 2006Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Publication number: 20040197120Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: ApplicationFiled: April 23, 2004Publication date: October 7, 2004Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Patent number: 6748190Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: GrantFiled: May 9, 2003Date of Patent: June 8, 2004Assignee: Ricoh Company, Ltd.Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Patent number: 6690896Abstract: The present invention provides an electro photographic image forming apparatus comprising a replacement assembly having a toner container attachable to the image forming apparatus, a feeding unit to feed toner from the toner container to a development unit, and a read/write non-volatile memory, wherein, the image forming apparatus comprising an estimation unit which generates information in such way that first, the estimation unit obtains an amount of a toner feed period for the feeding unit during forming images, next, accumulates the amount of a toner feed period into an accumulated sum of the amount of a toner feed periods, then, generates the information on the amount of toner in the replacement assembly and stores the information in the read/write non-volatile memory.Type: GrantFiled: December 21, 2001Date of Patent: February 10, 2004Assignee: Ricoh Company, Ltd.Inventors: Motonori Hanada, Jun Hosokawa, Kouta Fujimori, Kazuhiko Yuuki
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Publication number: 20030198487Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: ApplicationFiled: May 9, 2003Publication date: October 23, 2003Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Patent number: 6603943Abstract: In a developing apparatus, the interior of a case is divided into a first space positioned on a developer supply side for the supply of a developer to an image bearing member and a second space which is supplied with a replenishing toner, first and second agitating members are included and are adapted to be rotated to agitate and convey the developer are disposed within the first and second spaces, respectively, and a screw member is provided having n threads (n≧2) is used as the first agitating member disposed in the first space, and a screw member having (n−x) threads (x≧0) is used as the second agitating member disposed in the second space.Type: GrantFiled: October 31, 2001Date of Patent: August 5, 2003Assignee: Ricoh Company, Ltd.Inventors: Kazuhiko Yuuki, Yoshinori Ozawa
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Patent number: 6567637Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: GrantFiled: February 20, 2001Date of Patent: May 20, 2003Assignee: Ricoh Company, Ltd.Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Publication number: 20020085848Abstract: The present invention provides an electro photographic image forming apparatus comprising a replacement assembly having a toner container attachable to the image forming apparatus, a feeding unit to feed toner from the toner container to a development unit, and a read/write non-volatile memory, wherein, the image forming apparatus comprising an estimation unit which generates information in such way that first, the estimation unit obtains an amount of a toner feed period for the feeding unit during forming images, next, accumulates the amount of a toner feed period into an accumulated sum of the amount of a toner feed periods, then, generates the information on the amount of toner in the replacement assembly and stores the information in the read/write non-volatile memory.Type: ApplicationFiled: December 21, 2001Publication date: July 4, 2002Inventors: Motonori Hanada, Jun Hosokawa, Kouta Fujimori, Kazuhiko Yuuki
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Publication number: 20020051657Abstract: A developing apparatus is disclosed wherein the occurrence of a defective development caused by screw pitch traces or deficient supply of a developer is minimized. In the developing apparatus, the interior of a case 53 is divided into a first space 65 positioned on a developer supply side for the supply of a developer to an image bearing member and a second space 64 which is supplied with a replenishing toner, first and second agitating members 56, 55 adapted to be rotated to agitate and convey the developer are disposed within the first and second spaces, respectively, a screw member having n threads (n≧2) is used as the first agitating member disposed in the first space, and a screw member having (n−x) threads (x≧0) is used as the second agitating member disposed in the second space.Type: ApplicationFiled: October 31, 2001Publication date: May 2, 2002Inventors: Kazuhiko Yuuki, Yoshinori Ozawa
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Patent number: 6366754Abstract: A color image forming apparatus includes a plurality of image forming sections independent of each other. The image forming sections store respective toner of different colors that are chargeable to the same polarity. All the toner are implemented by the same binder resin and provided with the same particle size distribution. Further, developing units each storing toner of particular color are identical in specification. When two-ingredient type developers are used, the developers contain an identical carrier. The apparatus recycles the toner of different colors to the respective developing units. The alien color toner collected in each developing unit is prevented from remaining by being chargeable to the same polarity.Type: GrantFiled: September 22, 2000Date of Patent: April 2, 2002Assignee: Ricoh Company, Ltd.Inventors: Masumi Sato, Kazuhiko Yuuki, Hiroshi Yoshinaga, Yoshinori Ozawa, Atsushi Takehara
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Patent number: 6334039Abstract: An image forming apparatus includes a belt member to convey a sheet-formed medium, a belt supporting device to support the belt member, and a plurality of recording units including rotating image bearing members arranged in a conveying direction of the sheet-formed medium by the belt. The image forming apparatus performs processes of (1) forming a latent image on a surface of each image bearing member, (2) developing each latent image into a toner image with toner, and (3) then transferring each toner image onto the sheet-formed medium carried on the belt. A detection device detects arbitrary toner image patterns formed at the plurality of recording units and then directly transferred onto the belt, for obtaining information about density and placements of images without the toner patterns being deteriorated by contacting following downstream recording units.Type: GrantFiled: July 7, 2000Date of Patent: December 25, 2001Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Yoshinaga, Masumi Sato, Kazuhiko Yuuki, Yoshinori Ozawa, Atsushi Takehara
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Publication number: 20010021326Abstract: A toner replenishing device includes a toner conveyance path for connecting a toner storing device with a developing device, a toner conveying device for conveying the toner from the toner storing device to the developing device along the toner conveyance path, and an air supplying device connected to the toner conveyance path vie an air supply path for supplying the toner storing device with air from a bottom of the toner storing device so as to agitate the toner pooling in the toner storing device.Type: ApplicationFiled: February 20, 2001Publication date: September 13, 2001Applicant: RICOH COMPANY, LTD.Inventors: Takaaki Yanagisawa, Masumi Sato, Kazuhiko Yuuki, Akio Kosuge, Yoshinori Ozawa, Yoshi Hattori, Tomotoshi Nakahara, Kouta Fujimori, Satoshi Muramatsu, Junichi Matsumoto
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Patent number: 6141521Abstract: The invention relates to an image forming device and method therefor solving the subject matter that, if the linear speed of the developing solution carrier for that of the latent image carrier is lowered in order to secure the development capacity, the line image is deteriorated and there occurs a troublesome matter such as the blanking at the halftone rear edge. Such image forming device of the present invention is provided with a two-component magnetic brush type developing apparatus in which the developing bias composed of the DC bias and the AC bias superposed thereon is applied to the developing apparatus, and the latent image formed on the latent image carrier is developed with the two-component developing solution including the magnetic toner and the magnetic carrier. In the image forming device, the magnetic substance including percentage of the magnetic toner is set to 5 wt %.about.35 wt %.Type: GrantFiled: June 30, 1998Date of Patent: October 31, 2000Assignee: Ricoh Company, Ltd.Inventors: Kazuhiko Yuuki, Shinji Tamaki, Manabu Mochizuki, Takeshi Saitoh
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Patent number: 6101361Abstract: An image forming apparatus and method in which a transfer device is provided in a position separated from an image carrier. A transfer sheet is conveyed along and contacting a part of a circumferential surface of the image carrier facing the transfer device when transferring a toner image from the image carrier to the transfer sheet. A conveying guide is included to guide and covey the transfer sheet separated from the image carrier to a fixing unit.Type: GrantFiled: December 21, 1998Date of Patent: August 8, 2000Assignee: Ricoh Co., Ltd.Inventors: Kenji Karashima, Kohichi Yamazaki, Kentaro Matsumoto, Kazuhiko Yuuki, Manabu Mochizuki, Noriyuki Usui, Asami Mae, Masakuni Konja
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Patent number: 5884134Abstract: An image forming apparatus in which a transfer device is provided in a position separated from an image carrier. A transfer sheet is conveyed along and contacting a part of a circumferential surface of the image carrier facing the transfer device when transferring a toner image from the image carrier to the transfer sheet. A conveying guide is included to guide and covey the transfer sheet separated from the image carrier to a fixing unit. The conveying guide includes a guiding member to direct the conveying direction of the transfer sheet upward when the leading edge of the transfer sheet contacts the guiding member and to convey the transfer sheet at a part of the conveying guide or the guiding member in a position higher than the position of the leading edge of the transfer sheet contacting the conveying guide or the guiding member, so that the contact area between the transfer sheet and the image carrier increases.Type: GrantFiled: June 19, 1997Date of Patent: March 16, 1999Assignee: Ricoh Co., Ltd.Inventors: Kenji Karashima, Kohichi Yamazaki, Kentaro Matsumoto, Kazuhiko Yuuki, Manabu Mochizuki, Noriyuki Usui, Asami Mae, Masakuni Konja