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公开(公告)号：US11860566B2
公开(公告)日：2024-01-02
申请号：US18081910
申请日：2022-12-15
发明人： Takayuki Kanazawa , Nobuo Oshima , Takayoshi Kihara , Kuniaki Tamagaki , Shuhei Tokiwa , Taichi Sato
CPC分类号： G03G21/0064 , G03G15/0225 , G03G15/168 , G03G21/0005 , G03G21/007 , G03G21/169 , G03G21/0035 , G03G2215/022 , G03G2221/0005 , G03G2221/0089 , G03G2221/1618 , G03G2221/1627
摘要： An image forming apparatus includes a rotatable image bearing member, a developing member, a transfer member, and a brush contacting a surface of the image bearing member in a contact portion downstream of a transfer portion and upstream of a developing portion with respect to a rotational direction of the image bearing member. The toner which is not transferred onto a toner image receiving member is collected by the developing member. In a charging series, the toner is positioned on the same side as a normal charge polarity of the toner relative to the brush. In the contact portion, a maximum value of a contact pressure of 0.7 gf/mm2 or more and 3.5 gf/mm2 or less, a maximum contact area ratio is 18% or more and 74% or less, and a Clark-Evans index of the brush is 1 or more.
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公开(公告)号：US11846899B2
公开(公告)日：2023-12-19
申请号：US17386368
申请日：2021-07-27
发明人： Shuichi Tetsuno , Shinji Katagiri , Koji An , Hiroko Yokoyama , Wataru Takahashi , Shohei Ishio , Takayuki Tanaka , Tomonori Matsunaga
CPC分类号： G03G15/161 , G03G21/0005
摘要： An image forming apparatus includes a rotatable image bearing member and a rotatable developing member to carry developer made up of toner particles and carrier particles adhered to surfaces of the toner particles. Where a pressing force pressing the developing member against the image bearing member is F1, a total number of the carrier particles interposed between the toner particles and the image bearing member is N1, and an adhesion Ft between a carrier particle and a toner particle, measured when the carrier particle is pressed against the toner particle with F1/N1 that is a pressing force per unit carrier particle, and an adhesion Fdr1 between the carrier particle and the image bearing member, measured when the carrier particle is pressed against the image bearing member with F1/N1, satisfy Ft≤Fdr1.
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公开(公告)号：US20180203404A1
公开(公告)日：2018-07-19
申请号：US15851314
申请日：2017-12-21
发明人： Hirofumi TSUJI
IPC分类号： G03G15/00
CPC分类号： G03G15/757 , G03G15/751 , G03G21/0005 , G03G21/0094
摘要： An image forming apparatus includes a photosensitive drum, a cleaning blade, and a movement mechanism. The movement mechanism reciprocates the photosensitive drum in an axial direction of the photosensitive drum in a specific cycle. The movement mechanism includes a first cam gear and a second cam gear. The first cam gear rotates about an axis of the photosensitive drum together with the photosensitive drum. The second cam gear is restricted in position in the axial direction and rotates at a rotational speed different from that of the first cam gear. The first and second cam gears each have a plurality of coaxial cam portions. When top points and bottom points of the respective cam portions come in contact with one another by turns, the photosensitive drum moves in the axial direction.
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公开(公告)号：US10007225B2
公开(公告)日：2018-06-26
申请号：US15144978
申请日：2016-05-03
发明人： Hiroaki Nosho , Takatoshi Hamada , Yohei Kusano
CPC分类号： G03G21/105 , G03G21/0005 , G03G21/0011 , G03G21/0029 , G03G21/0035 , G03G21/0058
摘要： A feeding device for feeding a developer includes a cleaning member, an accommodating portion, a feeding member, and a sheet member. A wall surface of the accommodating portion is positioned in a side where the sheet member is provided with respect to a rectilinear line connecting a rotation center of the image bearing member and a rotation center of the feeding member in a flat plane perpendicular to an axial direction of the image bearing member. The wall surface approaches the rectilinear line with an increasing level with respect to a vertical direction. The feeding member is provided vertically above a position where the cleaning member contacts the image bearing member. A rotational direction of the feeding member and a rotational direction of the image bearing member are the same.
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公开(公告)号：US10001737B2
公开(公告)日：2018-06-19
申请号：US15714472
申请日：2017-09-25
发明人： Katsuya Ota
CPC分类号： G03G15/5062 , G03G15/0877 , G03G15/1695 , G03G21/0005 , G03G21/0064 , G03G2215/00531
摘要： An image forming apparatus includes: an image carrier, a developing section, a transfer roller, a power supply section, a conveyance roller, and an operation control section. The operation control section has a cleaning operation mode and an image formation operation mode where images are formed on recording paper. In the cleaning operation mode, the operation control section causes the developing section to supply a predefined amount of toner to a circumferential surface of the image carrier, causes the power supply section to apply a bias of a polarity opposite to a normal charge polarity to the transfer roller, then causes the conveyance roller to convey a single piece of recording paper, causes the conveyance roller to stop rotating operation when the recording paper is located in a nip area, and causes the image carrier and the transfer roller to rotate while the recording paper is stopped in the nip area.
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公开(公告)号：US20180157206A1
公开(公告)日：2018-06-07
申请号：US15888202
申请日：2018-02-05
发明人： Takashi Hiramatsu , Motonari Ito , Hideo Kihara
IPC分类号： G03G21/00
CPC分类号： G03G21/0005 , G03G21/0064
摘要： An image forming apparatus includes a control portion configured to perform a cleaning operation including: a first step of causing a developer, which has a reversed polarity and is attracted to a surface of a charging roller, to have a normal polarity under a state in which the developer bearing member is separated from the image bearing member with the contact/separation unit; and a second step of collecting the developer, which has the normal polarity and is attracted to the surface of the image bearing member, to the developer bearing member, by rotating the image bearing member and the developer bearing member under a state in which the developer bearing member is brought into contact with the image bearing member with the contact/separation unit after performing the first step.
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公开(公告)号：US20180136602A1
公开(公告)日：2018-05-17
申请号：US15814544
申请日：2017-11-16
申请人： KONICA MINOLTA, INC.
发明人： YOSHITO HASHIMURA
CPC分类号： G03G21/105 , B01D46/2411 , B01D46/446 , G03G15/0225 , G03G21/0005 , G03G21/10 , G03G21/206
摘要： An image forming apparatus includes: a first suction path for sucking and recovering dust from a place where the dust is generated; and a second suction path for sucking and recovering a predetermined gas from a place where the gas is generated, wherein the first suction path includes a first filter that collects the dust, a first suction fan provided downstream of the first filter, and an exhaust path of the first suction path, the second suction path includes a second filter that collects the gas, a second suction fan provided downstream of the second filter, and an exhaust path of the second suction path, and a connection in which the exhaust path of the first suction path is connected upstream of the second filter in the second suction path is included.
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公开(公告)号：US20180113409A1
公开(公告)日：2018-04-26
申请号：US15788156
申请日：2017-10-19
发明人： Keisuke Kinai
IPC分类号： G03G15/02
CPC分类号： G03G15/553 , G03G15/5033 , G03G21/0005
摘要： An image forming apparatus, includes: an image bearing member; a charging member which is disposed to be in contact with the image bearing member, and charges the image bearing member; an image forming portion which forms a developer image; a notifying member which notifies information relevant to a lifetime of the charging member; a cleaning member which is in contact with the image bearing member, and removes the developer on the image bearing member; a detecting member which detects driving torque of the image bearing member; an acquiring portion which acquires specification information relevant to a specification of the cleaning member; and a controller which has the notifying member notify the lifetime of the charging member based on the specification information acquired by the acquiring portion and information corresponding to the driving torque of the image bearing member detected by the detecting member and the number of image formed sheets.
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公开(公告)号：US20180101115A1
公开(公告)日：2018-04-12
申请号：US15714472
申请日：2017-09-25
发明人： Katsuya OTA
IPC分类号： G03G15/00
CPC分类号： G03G15/5062 , G03G15/0877 , G03G15/1695 , G03G21/0005 , G03G21/0064 , G03G2215/00531
摘要： An image forming apparatus includes: an image carrier, a developing section, a transfer roller, a power supply section, a conveyance roller, and an operation control section. The operation control section has a cleaning operation mode and an image formation operation mode where images are formed on recording paper. In the cleaning operation mode, the operation control section causes the developing section to supply a predefined amount of toner to a circumferential surface of the image carrier, causes the power supply section to apply a bias of a polarity opposite to a normal charge polarity to the transfer roller, then causes the conveyance roller to convey a single piece of recording paper, causes the conveyance roller to stop rotating operation when the recording paper is located in a nip area, and causes the image carrier and the transfer roller to rotate while the recording paper is stopped in the nip area.
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公开(公告)号：US09933747B2
公开(公告)日：2018-04-03
申请号：US15602409
申请日：2017-05-23
发明人： Shougo Sato , Atsushi Fukui , Isao Fukuchi
CPC分类号： G03G21/105 , G03G15/0178 , G03G15/166 , G03G21/0005 , G03G21/10 , G03G21/12 , G03G21/169 , G03G21/1853 , G03G2215/1647 , G03G2215/1661 , G03G2221/1684 , G03G2221/183 , G03G2221/1869
摘要： An image forming apparatus includes: a casing, a first process cartridge including a first photosensitive drum and a first drum-cleaning unit configured to collect waste toner on the first photosensitive drum, a second process cartridge including a second photosensitive drum and a second drum-cleaning unit configured to collect waste toner on the second photosensitive drum, a cartridge-supporting body movable between an internal position inside the casing and an external position outside of the casing, a conveying unit conveying the waste toner collected by the first and second drum-cleaning units, and a waste toner cartridge accommodating the conveyed waste toner. The casing includes a first positioning plate receiving one end portion of the first and second process cartridges, and a second positioning plate receiving another end portion of the first and second process cartridges. The conveying unit is disposed between the first positioning plate and the second positioning plate.
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