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公开(公告)号：US10782631B2
公开(公告)日：2020-09-22
申请号：US16718898
申请日：2019-12-18
申请人： KONICA MINOLTA, INC.
发明人： Masahiro Onodera
摘要： Provided is an image forming apparatus capable of preventing or suppressing occurrence of density unevenness even when a shearing force is applied between an image face on paper and a fixing belt. The image forming apparatus includes an image former, a fixer, and a controller. The image former forms a toner image constituted by a plurality of dots each containing a toner on paper. The fixer includes a fixing member moving at a first velocity and a pressure member forming a fixing nip portion with the fixing member and moving at a second velocity, and fixes the toner image on the paper at the fixing nip portion. When the first velocity and the second velocity at the fixing nip portion are different, the controller determines a toner amount to be attached to paper so as to make a toner amount distribution different in each of the dots before fixing.
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公开(公告)号：US20190354046A1
公开(公告)日：2019-11-21
申请号：US16381121
申请日：2019-04-11
申请人： Konica Minolta, Inc.
发明人： Masahiro Onodera
摘要： Provided is an image forming apparatus and a control program. A fixer includes a first roller which includes an elastic layer having a predetermined thickness in a surface, a second roller which includes an elastic layer having a thickness smaller than that of the first roller in a surface, a fixing belt which is laid across the first roller and forms a fixing nip portion between the second roller and the fixing belt, and first and second drive motors that drive the first and second rollers, respectively. A hardware processor controls a drive current of the first drive motor so that an electromotive current generated in the second drive motor has a predetermined value in a case where the first roller is rotatively driven by the first drive motor and the second roller is caused to rotate as a follower of the first roller and the fixing belt.
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公开(公告)号：US10317831B2
公开(公告)日：2019-06-11
申请号：US15915627
申请日：2018-03-08
申请人： Konica Minolta, Inc.
发明人： Masahiro Onodera
摘要： An image forming system includes first and second image forming apparatuses including respective image forming sections and fixing sections. When the system forms an image on a sheet using the first image forming section, then forms an image on the sheet using the second image forming apparatus, and forms an image on a same side of a sheet which has a nonuniform sheet thickness and first and second regions respectively having small and large sheet thicknesses, the image in the first region is formed and fixed using the first image forming apparatus and the image in the second region is formed and fixed using the second image forming apparatus, and the respective fixing sections of the first and the second image forming apparatuses pass the nonuniform sheet while applying a second load lower than a first load applied to a sheet having a uniform sheet thickness.
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公开(公告)号：US10527979B2
公开(公告)日：2020-01-07
申请号：US16381121
申请日：2019-04-11
申请人： Konica Minolta, Inc.
发明人： Masahiro Onodera
摘要： Provided is an image forming apparatus and a control program. A fixer includes a first roller which includes an elastic layer having a predetermined thickness in a surface, a second roller which includes an elastic layer having a thickness smaller than that of the first roller in a surface, a fixing belt which is laid across the first roller and forms a fixing nip portion between the second roller and the fixing belt, and first and second drive motors that drive the first and second rollers, respectively. A hardware processor controls a drive current of the first drive motor so that an electromotive current generated in the second drive motor has a predetermined value in a case where the first roller is rotatively driven by the first drive motor and the second roller is caused to rotate as a follower of the first roller and the fixing belt.
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公开(公告)号：US10747142B1
公开(公告)日：2020-08-18
申请号：US16718898
申请日：2019-12-18
申请人： KONICA MINOLTA, INC.
发明人： Masahiro Onodera
摘要： Provided is an image forming apparatus capable of preventing or suppressing occurrence of density unevenness even when a shearing force is applied between an image face on paper and a fixing belt. The image forming apparatus includes an image former, a fixer, and a controller. The image former forms a toner image constituted by a plurality of dots each containing a toner on paper. The fixer includes a fixing member moving at a first velocity and a pressure member forming a fixing nip portion with the fixing member and moving at a second velocity, and fixes the toner image on the paper at the fixing nip portion. When the first velocity and the second velocity at the fixing nip portion are different, the controller determines a toner amount to be attached to paper so as to make a toner amount distribution different in each of the dots before fixing.
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公开(公告)号：US10663901B2
公开(公告)日：2020-05-26
申请号：US16523801
申请日：2019-07-26
申请人： Konica Minolta, Inc.
发明人： Yasuo Shirodai , Makoto Fujii , Masahiro Onodera
摘要： An image forming apparatus includes: a fixer including fixing rotation body and pressing rotation body with a fixing nip therebetween, and heats and presses a fed sheet through the fixing nip to fix a toner image on the sheet to the sheet; and a hardware processor making a velocity difference between respective surface velocities of the fixing rotation body and the sheet passing through the fixing nip during a high-gloss mode operation to adjust a gloss of the toner image on the sheet. The hardware processor performs a control so that an absolute value of a velocity difference between respective surface velocities of the fixing rotation body and the pressing rotation body in press-contact when the sheet does not pass through the fixing nip is less than one between respective surface velocities of the fixing rotation body and the sheet when the sheet passes through the fixing nip during the high-gloss mode operation.
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