Patents by Inventor Nobuo Kuwabara
Nobuo Kuwabara 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: 20240118654Abstract: An image forming apparatus includes a body having an opening, a door on the body, a unit detachably attached to the body from the opening, a cover inside the door, a spring, and a lock. The door covers the opening at a first closed position. The unit is disposed at a mounting position inside the body. The cover is rotatable between a second closed position and an opening position in an opening direction. At the second closed position, the cover covers the unit at the mounting position. At the opening position, the cover forms an angle of 90 degrees or more with the body. The spring applies a force to the cover in the opening direction. The lock locks the cover at the second closed position. The cover displaced from the second closed position in the opening direction restricts a movement of the door to the first closed position.Type: ApplicationFiled: October 5, 2023Publication date: April 11, 2024Inventors: Nobuo KUWABARA, Hiroaki TAKAGI
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Patent number: 11256202Abstract: A snap ring is set to a set portion of a shaft of a rotator from a direction orthogonal to an axial direction of the shaft. The snap ring includes a first arcuate portion and a second arcuate portion facing each other, being elastically deformable in directions away from each other, holding the set portion by elastic deformation restoring force. One ends of the first and second arcuate portions are away from each other to form an insertion portion to insert the set portion. When the snap ring is not used, the first arcuate portion has a same radius of curvature as the second arcuate portion and the set portion, and a center of curvature closer to the second arcuate portion than the first arcuate portion, and the second arcuate portion has a center of curvature closer to the first arcuate portion than the second arcuate portion.Type: GrantFiled: December 16, 2020Date of Patent: February 22, 2022Assignee: RICOH COMPANY, LTD.Inventors: Yohhei Watanabe, Naoto Suzuki, Yuta Azeyanagi, Nobuo Kuwabara, Kenji Honjoh, Teppei Kawata, Haruki Nagata, Michiharu Suzuki
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Publication number: 20210200124Abstract: A snap ring is set to a set portion of a shaft of a rotator from a direction orthogonal to an axial direction of the shaft. The snap ring includes a first arcuate portion and a second arcuate portion facing each other, being elastically deformable in directions away from each other, holding the set portion by elastic deformation restoring force. One ends of the first and second arcuate portions are away from each other to form an insertion portion to insert the set portion. When the snap ring is not used, the first arcuate portion has a same radius of curvature as the second arcuate portion and the set portion, and a center of curvature closer to the second arcuate portion than the first arcuate portion, and the second arcuate portion has a center of curvature closer to the first arcuate portion than the second arcuate portion.Type: ApplicationFiled: December 16, 2020Publication date: July 1, 2021Applicant: Ricoh Company, Ltd.Inventors: Yohhei WATANABE, Naoto SUZUKI, Yuta AZEYANAGI, Nobuo KUWABARA, Kenji HONJOH, Teppei KAWATA, Haruki NAGATA, Michiharu SUZUKI
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Patent number: 10481515Abstract: A charging device is detachably attachable with respect to a body of an image forming apparatus. The charging device includes a charging roller and a cleaning member. The charging roller charges an image bearer. The cleaning member cleans the charging roller. The cleaning member has a higher cleaning performance on the charging roller during detachment in which the charging device is detached from the body of the image forming apparatus than during attachment in which the charging device is attached to the body of the image forming apparatus.Type: GrantFiled: February 5, 2019Date of Patent: November 19, 2019Assignee: Ricoh Company, Ltd.Inventors: Nobuo Kuwabara, Daisuke Tomita, Norio Kudoh, Kento Aoki, Takeshi Fukao
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Publication number: 20190258188Abstract: A charging device is detachably attachable with respect to a body of an image forming apparatus. The charging device includes a charging roller and a cleaning member. The charging roller charges an image bearer. The cleaning member cleans the charging roller. The cleaning member has a higher cleaning performance on the charging roller during detachment in which the charging device is detached from the body of the image forming apparatus than during attachment in which the charging device is attached to the body of the image forming apparatus.Type: ApplicationFiled: February 5, 2019Publication date: August 22, 2019Applicant: Ricoh Company, Ltd.Inventors: Nobuo Kuwabara, Daisuke Tomita, Norio Kudoh, Kento Aoki, Takeshi Fukao
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Patent number: 10042314Abstract: A cleaning device, which is included in a process cartridge and an image forming apparatus, includes a cleaning blade configured to remove a material attached to a surface of an image bearer, a cleaning case configured to contain the material removed by the cleaning blade, and a removed material receiver configured to receive the material failed to enter into the cleaning case when the material is removed by the cleaning blade, the removed material receiver having a first range at both ends in a width direction of the cleaning blade and a second range at a center in the width direction of the cleaning blade. A volume per unit length in a width direction of the first range is greater than a volume per unit length in a width direction of the second range.Type: GrantFiled: July 26, 2017Date of Patent: August 7, 2018Assignee: Ricoh Company, Ltd.Inventors: Daisuke Tomita, Nobuo Kuwabara, Yasuhiro Maehata, Norio Kudoh, Yasuhito Kuboshima, Kento Aoki
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Patent number: 9958823Abstract: A device disposed opposing an image bearer includes a roller to rotate while contacting a surface of the image bearer, a rolling bearing fitted around a shaft located at an end of the roller in an axial direction of the roller, a frame to house the roller, and a bearing support removably attached to the frame. The rolling bearing includes an outer ring, an inner ring, and a rolling element disposed between the outer ring and the inner ring. The bearing support holds, from an outer-ring side, the rolling bearing interposed between the bearing support and the frame. The bearing support includes a receiving portion to contact the outer ring of the rolling bearing and bias the rolling bearing toward the frame in a direction in which the rolling bearing is interposed between the bearing support and the frame.Type: GrantFiled: October 5, 2016Date of Patent: May 1, 2018Assignee: Ricoh Company, Ltd.Inventors: Daisuke Tomita, Takeshi Shintani, Yasuhiro Maehata, Yasuhito Kuboshima, Yusuke Ishizuka, Nobuo Kuwabara, Norio Kudoh, Kento Aoki
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Publication number: 20180046128Abstract: A cleaning device, which is included in a process cartridge and an image forming apparatus, includes a cleaning blade configured to remove a material attached to a surface of an image bearer, a cleaning case configured to contain the material removed by the cleaning blade, and a removed material receiver configured to receive the material failed to enter into the cleaning case when the material is removed by the cleaning blade, the removed material receiver having a first range at both ends in a width direction of the cleaning blade and a second range at a center in the width direction of the cleaning blade. A volume per unit length in a width direction of the first range is greater than a volume per unit length in a width direction of the second range.Type: ApplicationFiled: July 26, 2017Publication date: February 15, 2018Applicant: Ricoh Company, Ltd.Inventors: Daisuke TOMITA, Nobuo KUWABARA, Yasuhiro MAEHATA, Norio KUDOH, Yasuhito KUBOSHIMA, Kento AOKI
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Patent number: 9798288Abstract: An image forming apparatus includes an image bearer to bear a toner image, a lubricant supply roller to supply lubricant to a surface of the image bearer, a rotation speed changer to change a rotation speed of the lubricant supply roller, and a controller to control the rotation speed changer to change the rotation speed of the lubricant supply roller to a target speed based on a predetermined condition. The controller is configured to control the rotation speed changer to avoid a predetermined speed range.Type: GrantFiled: May 3, 2016Date of Patent: October 24, 2017Assignee: Ricoh Company, Ltd.Inventors: Yasuhiro Maehata, Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Daisuke Tomita, Yasuhito Kuboshima, Yusuke Ishizuka
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Patent number: 9696648Abstract: An image forming apparatus includes a process cartridge that includes an image bearer including a rotary shaft and rotates about the rotary shaft; a charger to charge a surface of the image bearer; and a developing device to develop an electrostatic latent image formed on the image bearer into a visible toner image. The charger includes a charging roller that rotates about a shaft together with the image bearer during image formation and electrically charges a surface of the image bearer. A surface linear speed of the charging roller is made slower than a surface linear speed of the image bearer. The image forming apparatus includes a charging roller controller that switches the rotational speed of the charging roller to a first rotational speed slower than the linear speed of the image bearer and a second rotational speed identical to the linear speed of the image bearer.Type: GrantFiled: January 15, 2016Date of Patent: July 4, 2017Assignee: Ricoh Company, Ltd.Inventors: Yasuhiro Maehata, Nobuo Kuwabara, Kenji Honjoh, Yasuhito Kuboshima, Yusuke Ishizuka, Takeshi Shintani
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Publication number: 20170102663Abstract: A device disposed opposing an image bearer includes a roller to rotate while contacting a surface of the image bearer, a rolling bearing fitted around a shaft located at an end of the roller in an axial direction of the roller, a frame to house the roller, and a bearing support removably attached to the frame. The rolling bearing includes an outer ring, an inner ring, and a rolling element disposed between the outer ring and the inner ring. The bearing support holds, from an outer-ring side, the rolling bearing interposed between the bearing support and the frame. The bearing support includes a receiving portion to contact the outer ring of the rolling bearing and bias the rolling bearing toward the frame in a direction in which the rolling bearing is interposed between the bearing support and the frame.Type: ApplicationFiled: October 5, 2016Publication date: April 13, 2017Inventors: Daisuke TOMITA, Takeshi SHINTANI, Yasuhiro MAEHATA, Yasuhito KUBOSHIMA, Yusuke ISHIZUKA, Nobuo KUWABARA, Norio KUDOH, Kento AOKI
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Publication number: 20160334757Abstract: An image forming apparatus includes an image bearer to bear a toner image, a lubricant supply roller to supply lubricant to a surface of the image bearer, a rotation speed changer to change a rotation speed of the lubricant supply roller, and a controller to control the rotation speed changer to change the rotation speed of the lubricant supply roller to a target speed based on a predetermined condition. The controller is configured to control the rotation speed changer to avoid a predetermined speed range.Type: ApplicationFiled: May 3, 2016Publication date: November 17, 2016Inventors: Yasuhiro MAEHATA, Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Daisuke Tomita, Yasuhito Kuboshima, Yusuke Ishizuka
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Publication number: 20160209771Abstract: An image forming apparatus includes a process cartridge that includes an image bearer including a rotary shaft and rotates about the rotary shaft; a charger to charge a surface of the image bearer; and a developing device to develop an electrostatic latent image formed on the image bearer into a visible toner image. The charger includes a charging roller that rotates about a shaft together with the image bearer during image formation and electrically charges a surface of the image bearer. A surface linear speed of the charging roller is made slower than a surface linear speed of the image bearer. The image forming apparatus includes a charging roller controller that switches the rotational speed of the charging roller to a first rotational speed slower than the linear speed of the image bearer and a second rotational speed identical to the linear speed of the image bearer.Type: ApplicationFiled: January 15, 2016Publication date: July 21, 2016Applicant: Ricoh Company, Ltd.Inventors: Yasuhiro Maehata, Nobuo Kuwabara, Kenji Honjoh, Yasuhito Kuboshima, Yusuke Ishizuka, Takeshi Shintani
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Patent number: 9383715Abstract: A lubricant supplying device includes a lubricant supplier contacting an image bearer, a solid lubricant contacting the roller, a detector detecting a lubricant amount, and a controller controlling a supplying of the roller based on a detector detection. The detector outputs to the controller a first signal of a near-end state when the amount reaches a first amount, a second signal of an end state when the amount reaches a second amount smaller than the first amount, and a third signal of an absolute end state when the amount reaches a third amount smaller than the second amount. The controller temporarily stops the supplying when the second signal is output, cancels a roller temporary stopped state even when lubricant replacement is not completed after this state, stops the supplying when the third signal is output, and maintains a roller stopped state until the replacement is completed after this state.Type: GrantFiled: November 6, 2015Date of Patent: July 5, 2016Assignee: RICOH COMPANY, LTD.Inventors: Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Yasuhiro Maehata, Yasuhito Kuboshima, Yusuke Ishizuka
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Patent number: 9367021Abstract: An image forming apparatus includes a controller and multiple image forming units each of which includes an image bearer, a toner image forming device to form a toner image on the image bearer, a transfer device to transfer the toner image from the image bearer onto a transfer medium, a cleaning device to remove toner from a surface of the image bearer, a waste-toner tube through which toner removed by the cleaning device is transported, and a toner conveying member to transport toner by rotation and disposed inside the waste-toner tube. The controller changes a rotation speed of the toner conveying member for each of the multiple image forming units according to toner type including a first toner and a second toner having poorer flow properties than the first toner, and at least one image forming units uses the second toner and the rest use the first toner.Type: GrantFiled: January 26, 2015Date of Patent: June 14, 2016Assignee: Ricoh Company, Ltd.Inventors: Yusuke Ishizuka, Takeshi Shintani, Nobuo Kuwabara, Kenji Honjoh, Yasuhito Kuboshima
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Publication number: 20160139555Abstract: A lubricant supplying device includes a lubricant supplier contacting an image bearer, a solid lubricant contacting the roller, a detector detecting a lubricant amount, and a controller controlling a supplying of the roller based on a detector detection. The detector outputs to the controller a first signal of a near-end state when the amount reaches a first amount, a second signal of an end state when the amount reaches a second amount smaller than the first amount, and a third signal of an absolute end state when the amount reaches a third amount smaller than the second amount. The controller temporarily stops the supplying when the second signal is output, cancels a roller temporary stopped state even when lubricant replacement is not completed after this state, stops the supplying when the third signal is output, and maintains a roller stopped state until the replacement is completed after this state.Type: ApplicationFiled: November 6, 2015Publication date: May 19, 2016Inventors: Kenji Honjoh, Takeshi Shintani, Nobuo Kuwabara, Yasuhiro Maehata, Yasuhito Kuboshima, Yusuke Ishizuka
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Patent number: 9207625Abstract: A lubricant supply device includes a solid lubricant, a lubricant holder to hold the solid lubricant, a lubricant supply member to supply lubricant to a lubrication target, a pressing member to press the solid lubricant toward the lubricant supply member, and a pressing force adjuster to change an amount of pressing force exerted by the pressing member.Type: GrantFiled: February 27, 2014Date of Patent: December 8, 2015Assignee: RICOH COMPANY, LTD.Inventors: Ryohta Gotoh, Kaoru Yoshino, Satoshi Hatori, Hiromichi Ninomiya, Nobuyuki Taguchi, Yasuhito Kuboshima, Naohiro Kumagai, Shinichi Kawahara, Nobuo Kuwabara, Hideyasu Seki, Yuta Azeyanagi
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Patent number: 9158267Abstract: An image forming apparatus including multiple image forming units; a waste-toner container; and a waste-toner conveyance device including a common conveyance channel member disposed in an arrangement direction of the image forming units and provided with toner inlets to receive the waste toner from toner outlets of the cleaning units, communicating channel members identical in structure and respectively disposed between the toner outlets and the toner inlets of the common conveyance channel member, and a rotatable conveying member to transport the waste toner inside the common conveyance channel member linearly along a rotation axis thereof. The common conveyance channel member is shaped to equalize relative positions of each of the toner outlets and a corresponding one of the toner inlets of the common conveyance channel member among the multiple image forming units among which a distance from the toner outlet to the rotation axis differs.Type: GrantFiled: September 3, 2014Date of Patent: October 13, 2015Assignee: Ricoh Company, Ltd.Inventors: Nobuo Kuwabara, Shinichi Kawahara, Norio Kudoh, Takeshi Shintani, Kenji Honjoh, Yasuhito Kuboshima, Yusuke Ishizuka
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Patent number: 9128452Abstract: A solid lubricant supply system includes a solid lubricant supplier to receive and supply solid lubricant to a solid lubricant supplying target. A pair of first and second moveable planar electrodes is opposed to each other. The second moveable planar electrode is partially moved toward the first moveable planar electrode as the solid lubricant is consumed. A residual solid lubricant quantity detecting unit is provide to detect a quantity of the residual solid lubricant at a first stage, in which the residual solid lubricant quantity is below a given level, by detecting electric conduction between the pair of first and second moveable planar electrodes when the pair of first and second moveable planar electrodes contacts each other. The first moveable planar electrode is enabled to further move together with the second moveable planar electrode when it is contacted and pressed by the second moveable planar electrode.Type: GrantFiled: May 29, 2014Date of Patent: September 8, 2015Assignee: Ricoh Company, Ltd.Inventors: Satoshi Hatori, Kenji Honjoh, Ryohta Gotoh, Akira Fujimori, Kaoru Yoshino, Naohiro Kumagai, Hideyasu Seki, Shinichi Kawahara, Takeshi Shintani, Nobuo Kuwabara, Norio Kudoh, Daisuke Tomita
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Publication number: 20150227107Abstract: An image forming apparatus includes a controller and multiple image forming units each of which includes an image bearer, a toner image forming device to form a toner image on the image bearer, a transfer device to transfer the toner image from the image bearer onto a transfer medium, a cleaning device to remove toner from a surface of the image bearer, a waste-toner tube through which toner removed by the cleaning device is transported, and a toner conveying member to transport toner by rotation and disposed inside the waste-toner tube. The controller changes a rotation speed of the toner conveying member for each of the multiple image forming units according to toner type including a first toner and a second toner having poorer flow properties than the first toner, and at least one image forming units uses the second toner and the rest use the first toner.Type: ApplicationFiled: January 26, 2015Publication date: August 13, 2015Applicant: RICOH COMPANY, LTD.Inventors: Yusuke ISHIZUKA, Takeshi SHINTANI, Nobuo KUWABARA, Kenji HONJOH, Yasuhito KUBOSHIMA