Patents by Inventor Makoto Nakura
Makoto Nakura 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: 8800160Abstract: A sheet length measuring device includes a rotating body configured to rotate with a movement of a sheet in a conveying direction; a position detecting unit configured to detect leading and trailing ends of the sheet passing through a position of the rotating body; a measuring unit configured to measure a rotation amount of the rotating body and output an origin signal per one revolution of the rotating body; a storage unit configured to store changes of a sheet conveying amount with respect to respective rotation angles in one revolution of the rotating body; and a calculating unit configured to calculate a corrected length of the sheet from a value obtained from a rotation angle of the rotating body when the leading end of the sheet is detected and a value obtained from a rotation angle of the rotating body when the trailing end of the sheet is detected.Type: GrantFiled: May 21, 2012Date of Patent: August 12, 2014Assignee: Ricoh Company, LimitedInventors: Koichi Kudo, Makoto Nakura, Naoto Ueda, Satoshi Ueda, Akira Kobashi, Shingo Takai
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Publication number: 20140186081Abstract: A recording-material cooling device includes a first belt, a first cooling unit, and a second cooling unit. The first belt is disposed at a first face side of a recording material. The first cooling unit has a first heat absorbing surface to contact the first belt to absorb heat of the recording material. The second cooling unit has a second heat absorbing surface to directly or indirectly contact the recording material to absorb heat of the recording material. The second cooling unit is disposed at a second face side of the recording material. The first and second cooling units are offset from each other in a transport direction of the recording material. Each of the first and second surfaces has a shape in which an inner area protrudes beyond opposed ends in the transport direction. The first and second surfaces overlap each other in a direction crossing the transport direction.Type: ApplicationFiled: December 26, 2013Publication date: July 3, 2014Inventors: Tomoyasu Hirasawa, Kenichi Takehara, Hiromitsu Fujiya, Keisuke Yuasa, Yasuaki Toda, Yutaka Shoji, Kenji Ishii, Makoto Nakura, Susumu Tateyama, Hiroaki Miyagawa, Keisuke Ikeda, Takeshi Watanabe
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Publication number: 20140140741Abstract: An image forming apparatus includes an image carrier, a transfer unit to transfer the image onto a recording medium, a torque limit unit to transmit drive force to the transfer unit at a torque less than the torque for transmitting drive force, and drive the transfer unit to rotate at a circumferential velocity higher than that of the image carrier when the image carrier and the transfer unit are in contact with each other, and a drive unit to output drive force to drive the transfer unit such that the transfer unit rotates at a circumferential velocity lower than that of the image carrier when the image carrier and the transfer unit are separate from each other, and the transfer unit rotates at a circumferential velocity higher than that of the image carrier when the image carrier and the transfer unit are in contact with each other.Type: ApplicationFiled: November 15, 2013Publication date: May 22, 2014Inventors: Makoto NAKURA, Shinya TOMITA, Naoto UEDA, Yoshinari ONUMA, Masanori TAKAYASU
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Publication number: 20140118762Abstract: An image forming apparatus includes an image forming unit to form an image on a recording medium; an inverting transport unit to invert first and second surfaces of the recording medium, and front and rear ends of the recording medium to transport the inverted recording medium; a recording medium width measuring unit to measure an end position of the recording medium in a width direction orthogonal to a transporting direction of the recording medium at a measuring position having an approximately identical distance from one end of the recording medium in the transporting direction before and after the image is formed on the recording medium; and a correcting unit to correct an image to be formed on a subsequent recording medium based on a change in a shape of the recording medium computed based on a measured result from the recording medium width measuring unit.Type: ApplicationFiled: October 22, 2013Publication date: May 1, 2014Inventors: Makoto NAKURA, Naoto Ueda, Shingo Takai, Satoshi Ueda
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Patent number: 8670694Abstract: A gear drive apparatus includes a gear train including a plurality of gears, and a holding unit accommodating the gear train and a lubricant to be supplied to tooth flanks of each of the plurality of gears, the holding unit including an inlet opening from which the lubricant is poured. The lubricant from the inlet opening is supplied to an engagement area where two gears of the plurality of gears are engaged with each other, or to a tooth flank area of one of the two gears at an upstream part from the engagement area along a rotational direction of the one of the two gears.Type: GrantFiled: October 5, 2011Date of Patent: March 11, 2014Assignee: Ricoh Company, Ltd.Inventors: Makoto Nakura, Masaru Kawamoto, Naoto Ueda, Hirofumi Ohkushi
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Publication number: 20140037299Abstract: An image forming apparatus includes an image forming unit forming an image on a first recording medium based on image data, a measurement unit being positioned in an immediate vicinity of the image forming unit, being arranged upstream of a sheet-conveyance path than the image forming unit, and measuring a size of the first recording medium, an expansion ratio calculation unit calculating an expansion ratio of the first recording medium based on a first size of the first recording medium obtained before the first recording medium is passed through the image forming unit and a second size of the first recording medium obtained after the first recording medium is passed through the image forming unit, and a correction unit correcting the image data used for forming another image on a second recording medium conveyed after the first recording medium based on the expansion ratio.Type: ApplicationFiled: July 25, 2013Publication date: February 6, 2014Applicant: RICOH COMPANY, LTD.Inventors: Makoto NAKURA, Naoto Ueda, Satoshi Ueda, Shingo Takai, Koichi Kudo
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Publication number: 20140029961Abstract: An image forming apparatus includes an image forming unit that forms an image on a recording medium; a width detector that detects positions of side edges of the recording medium in a width direction, which is orthogonal to a conveying direction in which the recording medium is conveyed, at multiple detection positions along the conveying direction; a shape calculator that calculates angles between the conveying direction and straight lines each connecting the positions of the same side edge detected at the multiple detection positions and calculates a shape of the recording medium based on the angles; and a correction unit that corrects image data of the image to be formed by the image forming unit based on the calculated shape of the recording medium.Type: ApplicationFiled: July 25, 2013Publication date: January 30, 2014Applicant: Ricoh Company, Ltd.Inventors: Naoto UEDA, Makoto Nakura, Shingo Takai, Satoshi Ueda, Koichi Kudo
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Patent number: 8608164Abstract: A sheet conveying apparatus including: a sheet conveying unit; an upstream side guiding member that forms an upstream side conveying route of a sheet; a downstream side guiding member that forms a downstream side conveying route of the sheet; an upstream side detection unit; and a downstream side detection unit, wherein a detection position of the sheet for the upstream side detection unit is set between the sheet conveying unit and a position where the sheet is in contact with the upstream side guiding member, and a detection position of the sheet for the downstream side detection unit is set between the sheet conveying unit and a position where the sheet is in contact with the downstream side guiding member.Type: GrantFiled: August 21, 2012Date of Patent: December 17, 2013Assignee: Ricoh Company, Ltd.Inventors: Shingo Takai, Makoto Nakura, Naoto Ueda, Satoshi Ueda, Akira Kobashi, Koichi Kudo
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Patent number: 8577261Abstract: A belt member is supported by a plurality of rollers and moves in a predetermined moving direction. A detecting unit detects a displacement of the belt member in its width direction. A correcting unit moves a second end of a first roller from among the rollers in either one of a forward direction and a backward direction while fixing its first end based on a result of detecting the displacement of the belt member such that a tilt of a rotating shaft of the first roller is changed to correct a meandering of the belt member. An adjusting unit adjusts a fixing position of the first end.Type: GrantFiled: June 8, 2012Date of Patent: November 5, 2013Assignee: Ricoh Company, LimitedInventors: Makoto Nakura, Junji Shirakawa, Hiroshi Suzuki
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Publication number: 20130251434Abstract: An image forming apparatus includes a drive roller configured to rotate, a driven roller configured to hold and convey a print medium at a gap between the drive and driven rollers, an image carrier configured to have a toner image formed on a surface thereof and to rotate, the image carrier being situated downstream relative to the drive roller and the driven roller in a travel direction of the print medium, a transfer roller configured to hold and convey, at another gap between the image carrier and the transfer roller, the print medium passed from the drive roller and the driven roller to transfer the toner image onto a surface of the print medium, and a conveyance suspension unit to stop the drive roller and the driven roller from applying a drive force to the print medium at a time at which the print medium reaches such another gap.Type: ApplicationFiled: March 15, 2013Publication date: September 26, 2013Inventors: Naoto UEDA, Makoto NAKURA, Shingo TAKAI, Satoshi UEDA, Koichi KUDO
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Publication number: 20130228969Abstract: A disclosed sheet carrying device includes a first carrying unit that includes a first rotary body, a first driving unit outputting a driving force at a first peripheral speed, a one-way clutch transmitting the driving force only in a sheet carrying direction, and a second rotary body driven by the first rotary body via the sheet; and a second carrying unit including a third rotary body rotating at a second peripheral speed being the first peripheral speed or more, a fourth rotary body carrying the sheet with the third rotary body, a second driving unit outputting a driving force for driving the fourth rotary body at a third peripheral speed being the second peripheral speed or more, and a torque limiter having a slip torque smaller than a sheet carrying torque and cutting off the driving force while the sheet is interposed between the third and fourth rotary bodies.Type: ApplicationFiled: February 28, 2013Publication date: September 5, 2013Applicant: RICOH COMPANY, LTD.Inventors: Makoto NAKURA, Naoto UEDA, Koichi KUDO, Shingo TAKAI
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Patent number: 8515310Abstract: A pressing mechanism that presses a contact unit, which is brought into contact with a contact target unit against the contact target unit, includes a holding unit that holds the contact unit. The holding unit includes two first portions that are arranged at both ends of the holding unit in its width direction away from the contact unit and are biased toward the contact target unit and a second portion that is arranged at approximately a center in the width direction sandwiching the contact unit with the first portions and supports the holding unit.Type: GrantFiled: March 13, 2009Date of Patent: August 20, 2013Assignee: Ricoh Company, LimitedInventors: Makoto Nakura, Hiroshi Suzuki, Hirofumi Ohkushi, Junji Shirakawa
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Publication number: 20130195482Abstract: A sheet conveying apparatus includes a sheet conveying unit that conveys a sheet; a conveying amount measuring unit that measures a conveying amount of the sheet conveyed by the sheet conveying unit; a first detection unit that detects the sheet downstream of the sheet conveying unit in a conveying direction of the sheet; a second detection unit that detects the sheet upstream of the sheet conveying unit in the conveying direction of the sheet; and a conveying distance calculation unit that calculates a conveying distance of the sheet based on the measured result by the conveying amount measuring unit and the detected results detected by the first detection unit and the second detection unit.Type: ApplicationFiled: July 27, 2012Publication date: August 1, 2013Inventors: Makoto NAKURA, Takuro Kamiya, Shingo Takai, Naoto Ueda, Satoshi Ueda, Akira Kobashi, Koichi Kudo
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Patent number: 8391759Abstract: A belt device includes a belt member, a detecting unit, and a preventing member. The belt member is stretched over a plurality of rollers and moves in a predetermined moving direction. The detecting unit detects deviation of the belt member in a belt width direction of the belt member. The preventing member is arranged near the detecting unit and prevents deviation of the belt member in a direction other than the moving direction and the belt width direction.Type: GrantFiled: March 24, 2008Date of Patent: March 5, 2013Assignee: Ricoh Company, LimitedInventor: Makoto Nakura
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Publication number: 20130049296Abstract: A sheet conveying apparatus including: a sheet conveying unit; an upstream side guiding member that forms an upstream side conveying route of a sheet; a downstream side guiding member that forms a downstream side conveying route of the sheet; an upstream side detection unit; and a downstream side detection unit, wherein a detection position of the sheet for the upstream side detection unit is set between the sheet conveying unit and a position where the sheet is in contact with the upstream side guiding member, and a detection position of the sheet for the downstream side detection unit is set between the sheet conveying unit and a position where the sheet is in contact with the downstream side guiding member.Type: ApplicationFiled: August 21, 2012Publication date: February 28, 2013Applicant: RICOH COMPANY, LTD.,Inventors: Shingo TAKAI, Makoto NAKURA, Naoto UEDA, Satoshi UEDA, Akira KOBASHI, Koichi KUDO
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Publication number: 20130049287Abstract: A sheet conveying apparatus includes a sheet conveying unit including a drive roller and a driven roller; a downstream detection unit and an upstream detection unit; a conveying amount measuring unit that measures a conveying amount of the sheet; and a conveying distance calculation unit that calculates a conveying distance of the sheet, wherein a distance between the downstream detection unit and the upstream detection unit or a perimeter of one of the drive roller and the driven roller is set such that an expected conveying distance calculated based on a set sheet length of an expected value of the sheet becomes a substantially integer multiple of a perimeter of the one of the drive roller and the driven roller.Type: ApplicationFiled: August 13, 2012Publication date: February 28, 2013Applicant: RICOH COMPANY, LTD.Inventors: Naoto UEDA, Makoto Nakura, Shingo Takai, Koichi Kudo, Satoshi Ueda, Akira Kobashi
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Publication number: 20120291299Abstract: A sheet length measuring device includes a rotating body configured to rotate with a movement of a sheet in a conveying direction; a position detecting unit configured to detect leading and trailing ends of the sheet passing through a position of the rotating body; a measuring unit configured to measure a rotation amount of the rotating body and output an origin signal per one revolution of the rotating body; a storage unit configured to store changes of a sheet conveying amount with respect to respective rotation angles in one revolution of the rotating body; and a calculating unit configured to calculate a corrected length of the sheet from a value obtained from a rotation angle of the rotating body when the leading end of the sheet is detected and a value obtained from a rotation angle of the rotating body when the trailing end of the sheet is detected.Type: ApplicationFiled: May 21, 2012Publication date: November 22, 2012Applicant: RICOH COMPANY, LIMITEDInventors: Koichi KUDO, Makoto NAKURA, Naoto UEDA, Satoshi UEDA, Akira KOBASHI, Shingo TAKAI
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Publication number: 20120263497Abstract: A gear drive apparatus includes a gear train including a plurality of gears, and a holding unit accommodating the gear train and a lubricant to be supplied to tooth flanks of each of the plurality of gears, the holding unit including an inlet opening from which the lubricant is poured. The lubricant from the inlet opening is supplied to an engagement area where two gears of the plurality of gears are engaged with each other, or to a tooth flank area of one of the two gears at an upstream part from the engagement area along a rotational direction of the one of the two gears.Type: ApplicationFiled: October 5, 2011Publication date: October 18, 2012Applicant: RICOH COMPANY, LTD.Inventors: Makoto NAKURA, Masaru KAWAMOTO, Naoto UEDA, Hirofumi OHKUSHI
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Publication number: 20120257915Abstract: A belt member is supported by a plurality of rollers and moves in a predetermined moving direction. A detecting unit detects a displacement of the belt member in its width direction. A correcting unit moves a second end of a first roller from among the rollers in either one of a forward direction and a backward direction while fixing its first end based on a result of detecting the displacement of the belt member such that a tilt of a rotating shaft of the first roller is changed to correct a meandering of the belt member. An adjusting unit adjusts a fixing position of the first end.Type: ApplicationFiled: June 8, 2012Publication date: October 11, 2012Inventors: Makoto Nakura, Junji Shirakawa, Hiroshi Suzuki
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Patent number: 8238793Abstract: A belt member is supported by a plurality of rollers and moves in a predetermined moving direction. A detecting unit detects a displacement of the belt member in its width direction. A correcting unit moves a second end of a first roller from among the rollers in either one of a forward direction and a backward direction while fixing its first end based on a result of detecting the displacement of the belt member such that a tilt of a rotating shaft of the first roller is changed to correct a meandering of the belt member. An adjusting unit adjusts a fixing position of the first end.Type: GrantFiled: December 11, 2008Date of Patent: August 7, 2012Assignee: Ricoh Company, LimitedInventors: Makoto Nakura, Junji Shirakawa, Hiroshi Suzuki