Patents by Inventor Takumi Shirakuma
Takumi Shirakuma 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: 20240089391Abstract: A control device includes a controller that determines, based on physical property information corresponding to physical property of a recording sheet and read information on an image evaluated as abnormal through reading of an image on the recording sheet by a reading section on a recording sheet conveyance path, a process condition under which an image forming section performs image forming on the recording sheet.Type: ApplicationFiled: August 7, 2023Publication date: March 14, 2024Applicant: KONICA MINOLTA, INC.Inventors: Kenji IZUMIYA, Tatsuo ISHIZUKA, Hiroshi OYAMA, Takumi SHIRAKUMA
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Patent number: 11201573Abstract: A driving device includes: a first motor that transmits power to a rotation shaft of a conveyance roller for conveying a paper sheet; a second motor that transmits power to the rotation shaft of the conveyance roller; and a motor controller that controls rotational speeds of the first and second motors by changing a control value, wherein the motor controller controls the control value of the first motor at multiple steps at a time of acceleration or deceleration and changes the control value of the second motor according to a change range of the control value of the first motor in synchronization with a timing when the control value of the first motor is changed.Type: GrantFiled: June 19, 2019Date of Patent: December 14, 2021Assignee: KONICA MINOLTA, INC.Inventors: Keigo Ogura, Takumi Shirakuma, Kenji Izumiya, Hidenori Mine, Hirokatsu Kodama
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Publication number: 20200161992Abstract: A motor drive device controls driving of a plurality of motors that rotate a common drive shaft, and includes: a motor drive device that outputs the same drive power to each motor of the plurality of motors, and includes a motor drive controller that controls the drive power, using a rotation speed detection signal of a motor of the plurality of motors as a feedback signal; and a controller that determines a drive abnormality from the rotation speed detection signal of the motor or the drive power of the motor, wherein the controller determines a motor abnormal state and an overloaded state, from the drive power of the motor.Type: ApplicationFiled: November 18, 2019Publication date: May 21, 2020Inventors: Takumi SHIRAKUMA, Kenji IZUMIYA
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Publication number: 20200052615Abstract: A motor drive apparatus drives and controls a plurality of motors that rotate a common drive shaft. The motor drive apparatus includes a motor drive hardware processor that outputs equal drive power to each of the plurality of motors, and manipulates the drive power with a rotational speed detection signal of any one of the plurality of motors as a feedback signal. The feedback signal is switched based on conditions such as responsiveness and efficiency.Type: ApplicationFiled: July 9, 2019Publication date: February 13, 2020Inventors: Takumi Shirakuma, Hirokatsu Kodama, Hidenori Mine, Keigo Ogura, Kenji Izumiya
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Publication number: 20200019108Abstract: An image forming device includes a resist roller feeding a sheet of paper toward an image forming unit; a first detector arranged upstream of the resist roller in a feeding direction to detect a front edge of the sheet of paper; a first calculator computing a first misalignment amount of the sheet of paper based on detection results by the first detector; a corrector correcting misalignment of the sheet of paper based on the computed first misalignment amount; a second detector arranged downstream of the resist roller in the feeding direction to detect a position of an end of the sheet of paper in a widthwise direction; a second calculator computing a second misalignment amount of the sheet of paper based on detection results by the second detector; and an adjuster adjusting a correction amount by the corrector based on the computed second misalignment amount.Type: ApplicationFiled: July 2, 2019Publication date: January 16, 2020Applicant: KONICA MINOLTA, INC.Inventors: Hidenori MINE, Kenji IZUMIYA, Keigo OGURA, Takumi SHIRAKUMA, Hirokatsu KODAMA
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Publication number: 20190393810Abstract: A driving device includes: a first motor that transmits power to a rotation shaft of a conveyance roller for conveying a paper sheet; a second motor that transmits power to the rotation shaft of the conveyance roller; and a motor controller that controls rotational speeds of the first and second motors by changing a control value, wherein the motor controller controls the control value of the first motor at multiple steps at a time of acceleration or deceleration and changes the control value of the second motor according to a change range of the control value of the first motor in synchronization with a timing when the control value of the first motor is changed.Type: ApplicationFiled: June 19, 2019Publication date: December 26, 2019Applicant: KONICA MINOLTA, INC.Inventors: Keigo OGURA, Takumi SHIRAKUMA, Kenji IZUMIYA, Hidenori MINE, Hirokatsu KODAMA
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Patent number: 10509349Abstract: A fixing device includes a first fixing section, a second fixing section, the first fixing section and the second fixing section forming a fixing nip therebetween, a nip width adjusting section capable of adjusting a nip width of the fixing nip, a rotation speed detecting section that detects a rotation speed of the second fixing section, and a hardware processor that controls the nip width adjusting section to make the nip width equal to a predetermined reference nip width.Type: GrantFiled: November 7, 2018Date of Patent: December 17, 2019Assignee: KONICA MINOLTA, INC.Inventors: Kenji Izumiya, Takumi Shirakuma, Keigo Ogura, Hidenori Mine, Hirokatsu Kodama
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Patent number: 10418923Abstract: A rotating motion control apparatus including a memory which stores an index value concerning a rotating speed of a stepping motor; and a hardware processor which determines the rotating speed of the stepping motor and controls operation of a driver which rotates the stepping motor according to the rotating speed; wherein the memory stores an arrangement of a speed index value and an arrangement of an acceleration index value, and the hardware processor controls the operation of the driver by combining a period of determining the rotating speed according to the arrangement of the speed index value and a period of calculating and determining the rotating speed based on the arrangement of the acceleration index value when the rotating speed is altered.Type: GrantFiled: April 25, 2018Date of Patent: September 17, 2019Assignee: KONICA MINOLTA, INC.Inventors: Keigo Ogura, Takumi Shirakuma, Yumiko Izumiya
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Publication number: 20190146397Abstract: A fixing device includes a first fixing section, a second fixing section, the first fixing section and the second fixing section forming a fixing nip therebetween, a nip width adjusting section capable of adjusting a nip width of the fixing nip, a rotation speed detecting section that detects a rotation speed of the second fixing section, and a hardware processor that controls the nip width adjusting section to make the nip width equal to a predetermined reference nip width.Type: ApplicationFiled: November 7, 2018Publication date: May 16, 2019Applicant: Konica Minolta, Inc.Inventors: Kenji IZUMIYA, Takumi SHIRAKUMA, Keigo OGURA, Hidenori MINE, Hirokatsu KODAMA
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Publication number: 20180342967Abstract: A rotating motion control apparatus including a memory which stores an index value concerning a rotating speed of a stepping motor; and a hardware processor which determines the rotating speed of the stepping motor and controls operation of a driver which rotates the stepping motor according to the rotating speed; wherein the memory stores an arrangement of a speed index value and an arrangement of an acceleration index value, and the hardware processor controls the operation of the driver by combining a period of determining the rotating speed according to the arrangement of the speed index value and a period of calculating and determining the rotating speed based on the arrangement of the acceleration index value when the rotating speed is altered.Type: ApplicationFiled: April 25, 2018Publication date: November 29, 2018Applicant: KONICA MINOLTA, INC.Inventors: Keigo OGURA, Takumi SHIRAKUMA, Yumiko IZUMIYA
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Patent number: 9921524Abstract: An image formation apparatus comprising: a belt member suspended by a plurality of supporting rotating bodies and thus rotating; a cleaning member removing toner adhering to the belt member; a tray receiving waste toner removed from the belt member by the cleaning member; a vibration mechanism vibrating the tray to move the waste toner toward a lower side of the tray; a steering control mechanism to perform movement control to move the belt member in an axial direction of the supporting rotating bodies while the belt member rotates; and a vibration adjustment mechanism to change a manner of vibration of the vibration mechanism, based on the movement control by the steering control mechanism.Type: GrantFiled: December 6, 2016Date of Patent: March 20, 2018Assignee: KONICA MINOLTA, INC.Inventors: Satoru Sasaki, Yumiko Izumiya, Hidenori Mine, Takumi Shirakuma, Kosuke Sasaki
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Patent number: 9771236Abstract: In a saddle-stitching apparatus, when a sheet is transported to a center-folding unit, a folding blade moves from a retrieved position to a nip position between a pair of folding rollers. A forward end of the folding blade comes into contact with a fold of the sheet, so that the sheet is folded along the fold. When the sheet is attached to the nip position between the folding rollers, the folding rollers start rotating and then, the folding blade inserts the center-folded sheet between the folding rollers. After the center-fold finishing is completed, the rotations of the folding rollers stop in timing at which the folding blade is pulled out of the nip position between the folding rollers. When pulling the folding blade out of the nip position between the folding rollers, the rotations of the folding rollers restart.Type: GrantFiled: April 24, 2015Date of Patent: September 26, 2017Assignee: KONICA MINOLTA, INC.Inventors: Shohei Otsu, Hirofumi Nakajima, Teruhiko Toyoizumi, Takumi Shirakuma
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Publication number: 20170168427Abstract: An image formation apparatus comprising: a belt member suspended by a plurality of supporting rotating bodies and thus rotating; a cleaning member removing toner adhering to the belt member; a tray receiving waste toner removed from the belt member by the cleaning member; a vibration mechanism vibrating the tray to move the waste toner toward a lower side of the tray; a steering control mechanism to perform movement control to move the belt member in an axial direction of the supporting rotating bodies while the belt member rotates; and a vibration adjustment mechanism to change a manner of vibration of the vibration mechanism, based on the movement control by the steering control mechanism.Type: ApplicationFiled: December 6, 2016Publication date: June 15, 2017Inventors: Satoru SASAKI, Yumiko IZUMIYA, Hidenori MINE, Takumi SHIRAKUMA, Kosuke SASAKI
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Patent number: 9327541Abstract: The image forming system contains an image forming apparatus and a post-processing apparatus. The post-processing apparatus includes a flattening unit that flattens a back portion of a booklet, an elevating mechanism that moves the flattening unit operating together with a conveyance of the booklet and a post-processing control portion that controls the flattening unit to perform flattening processing which flattens the back portion of the booklet during the conveyance of the booklet by the elevating mechanism. The elevating mechanism elevates a booklet-holding mechanism including the flattening unit operating together with a conveyance of the booklet. The booklet-holding mechanism and the flattening unit moves up and down between cut-off processing portion and discharging portion operating together with the conveyance of the booklet. A square back roller reciprocatively moves along the back portion of the booklet together with the movement of roller moving mechanism.Type: GrantFiled: April 10, 2014Date of Patent: May 3, 2016Assignee: KONICA MINOLTA, INC.Inventors: Hirofumi Nakajima, Eiji Sugimoto, Takumi Shirakuma, Shohei Otsu
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Publication number: 20150336763Abstract: In a saddle-stitching apparatus, when a sheet is transported to a center-folding unit, a folding blade moves from a retrieved position to a nip position between a pair of folding rollers. A forward end of the folding blade comes into contact with a fold of the sheet, so that the sheet is folded along the fold. When the sheet is attached to the nip position between the folding rollers, the folding rollers start rotating and then, the folding blade inserts the center-folded sheet between the folding rollers. After the center-fold finishing is completed, the rotations of the folding rollers stop in timing at which the folding blade is pulled out of the nip position between the folding rollers. When pulling the folding blade out of the nip position between the folding rollers, the rotations of the folding rollers restart.Type: ApplicationFiled: April 24, 2015Publication date: November 26, 2015Applicant: KONICA MINOLTA, INC.Inventors: Shohei OTSU, Hirofumi NAKAJIMA, Teruhiko TOYOIZUMI, Takumi SHIRAKUMA
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Publication number: 20140308096Abstract: The image forming system contains an image forming apparatus and a post-processing apparatus. The post-processing apparatus includes a flattening unit that flattens a back portion of a booklet, an elevating mechanism that moves the flattening unit operating together with a conveyance of the booklet and a post-processing control portion that controls the flattening unit to perform flattening processing which flattens the back portion of the booklet during the conveyance of the booklet by the elevating mechanism. The elevating mechanism elevates a booklet-holding mechanism including the flattening unit operating together with a conveyance of the booklet. The booklet-holding mechanism and the flattening unit moves up and down between cut-off processing portion and discharging portion operating together with the conveyance of the booklet. A square back roller reciprocatively moves along the back portion of the booklet together with the movement of roller moving mechanism.Type: ApplicationFiled: April 10, 2014Publication date: October 16, 2014Applicant: KONICA MINOLTA, INC.Inventors: Hirofumi NAKAJIMA, Eiji SUGIMOTO, Takumi SHIRAKUMA, Shohei OTSU
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Patent number: 8226076Abstract: When a sheet is loaded to the sheet tray, the position of a trailing edge regulating section is set in response to the size of an insert sheet. Owing to this, the print sheet ejected from the ejection rollers onto the sheet tray falls onto the surface of the insert sheet. Further, when a booklet with an insert sheet placed therein is produced, an insert sheet is supplied to the sheet tray along the second conveying path. The shift amount of the execution position of center folding or the execution position of center stitching with respect to the sheet bundle is calculated in conformity to the finishing form of the booklet containing the insert sheet.Type: GrantFiled: October 5, 2010Date of Patent: July 24, 2012Assignee: Konica Minolta Business Technologies, Inc.Inventors: Takumi Shirakuma, Takeshi Tamada, Eiji Sugimoto, Teruhiko Toyoizumi, Hideo Yamane
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Patent number: 8023881Abstract: A sheet finisher having a post-processing section that conducts post-processing on a sheet on which an image has been formed by an image forming apparatus, the sheet finisher comprising: an intermediate storing section in which a plurality of sheets conveyed from the image forming apparatus are superposed to be stored temporarily; a pair of conveyance rollers that convey the plurality of sheets stored in the intermediate storing section to the post-processing section while the plurality of sheets are superposed; each of two drive motors which drives one of the pair of conveyance rollers that comes in contact with one sheet of the plurality of sheets and the other of the pair of conveyance rollers that comes in contact with the other sheet of the plurality of sheets, separately; and a correction controller that controls a rotation speed of at least one of the two drive motors.Type: GrantFiled: September 18, 2007Date of Patent: September 20, 2011Assignee: Konica Minolta Business Technologies, Inc.Inventors: Masayuki Watanabe, Eiji Sugimoto, Hideo Yamane, Takumi Shirakuma
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Publication number: 20110084436Abstract: When a sheet is loaded to the sheet tray, the position of a trailing edge regulating section is set in response to the size of an insert sheet. Owing to this, the print sheet ejected from the ejection rollers onto the sheet tray falls onto the surface of the insert sheet. Further, when a booklet with an insert sheet placed therein is produced, an insert sheet is supplied to the sheet tray along the second conveying path. The shift amount of the execution position of center folding or the execution position of center stitching with respect to the sheet bundle is calculated in conformity to the finishing form of the booklet containing the insert sheet.Type: ApplicationFiled: October 5, 2010Publication date: April 14, 2011Inventors: Takumi SHIRAKUMA, Takeshi TAMADA, Eiji SUGIMOTO, Teruhiko TOYOIZUMI, Hideo YAMANE
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Publication number: 20080298867Abstract: A sheet finisher having a post-processing section that conducts post-processing on a sheet on which an image has been formed by an image forming apparatus, the sheet finisher comprising: an intermediate storing section in which a plurality of sheets conveyed from the image forming apparatus are superposed to be stored temporarily; a pair of conveyance rollers that convey the plurality of sheets stored in the intermediate storing section to the post-processing section while the plurality of sheets are superposed; each of two drive motors which drives one of the pair of conveyance rollers that comes in contact with one sheet of the plurality of sheets and the other of the pair of conveyance rollers that comes in contact with the other sheet of the plurality of sheets, separately; and a correction controller that controls a rotation speed of at least one of the two drive motors.Type: ApplicationFiled: September 18, 2007Publication date: December 4, 2008Inventors: Masayuki Watanabe, Eiji Sugimoto, Hideo Yamane, Takumi Shirakuma