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公开(公告)号：US20240353777A1
公开(公告)日：2024-10-24
申请号：US18625919
申请日：2024-04-03
申请人： Konica Minolta, Inc.
发明人： Michiaki ISHIKAWA , Akihiko ITAMI , Aya SHIRAI
CPC分类号： G03G15/0928 , G03G15/0808 , G03G15/0818 , G03G21/1814 , G03G2215/0604
摘要： A developing roller for an electrophotographic image forming apparatus, which conveys a developer, wherein the developing roller includes a developing sleeve and a member that generates a magnetic flux inside the developing sleeve, and the developing sleeve contains an aluminum alloy containing more than 0.6% by mass of silicon.
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公开(公告)号：US12066771B2
公开(公告)日：2024-08-20
申请号：US17376300
申请日：2021-07-15
发明人： Masashi Wakisaka
CPC分类号： G03G15/0891 , G03G15/0882 , G03G15/0893 , G03G15/09 , G03G21/206 , G03G2215/0609 , G03G2215/0687 , G03G2215/0819 , G03G2215/0827 , G03G2215/0838
摘要： A developing apparatus includes a developing container to accommodate a developer and having first and second chambers divided by a partition wall for supplying the developer to a rotatable developing member and first and second communicating portions to allow the developer to move between first and second chambers by conveyance screws. A third communicating portion is disposed between the first and second communicating portions and above the conveyance screws to allow air inside the developing container to move between the first chamber and the second chamber. The developing container further includes a third chamber disposed above the second chamber in the vertical direction and accommodates initial developer in an unused state of the developing apparatus, and an opening portion for discharging the air inside the developing container to outside of the developing container is provided in the third chamber, with the opening being disposed above the third chamber.
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公开(公告)号：US12001156B2
公开(公告)日：2024-06-04
申请号：US18023977
申请日：2020-12-15
发明人： Seungchan Park , Jungho Roh , Myeongdong Kim , Donguk Kim , Youngkwang Shin
CPC分类号： G03G15/0928 , G03G15/0818
摘要： In some examples, a developing device includes a developing container including an opening and to store a developer, a developing sleeve installed in the developing container and partially exposed to an outside of the developing container through the opening, a regulation member upstream of the opening in a rotation direction of the developing sleeve and to regulate an amount of the developer adhered to the developing sleeve and supplied to the opening, and a magnetic member inside the developing sleeve. The magnetic member includes a main pole facing the opening, a regulation pole facing the regulation member, and a catch pole upstream of the regulation pole in the rotation direction of the developing sleeve. The magnetic member is to cause adhesion of the developer in the developing container to the developing sleeve. At least one of lengths of the catch pole or the regulation pole and diameters of both end portions of the catch pole or the regulation pole are less than a length and a diameter, respectively, of the main pole.
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公开(公告)号：US11982954B2
公开(公告)日：2024-05-14
申请号：US17826401
申请日：2022-05-27
发明人： Takahiro Suzuki , Tomoyuki Sakamaki
IPC分类号： G03G15/09
CPC分类号： G03G15/0921
摘要： With respect to a rotational direction of a rotatable developing member of a developing device, an opposing position where a regulating portion of the developing device is opposed to an outer peripheral surface of the rotatable developing member is between a first maximum position and a position where a magnetic flux density of a regulating pole in a tangential direction relative to the outer peripheral surface of the rotatable developing member is zero. With respect to the rotational direction of the rotatable developing member, the position where the magnetic flux density of the regulating pole in the tangential direction relative to the outer peripheral surface of the rotatable developing member is zero is within a range of ±2° of a midpoint between the first maximum position and a second maximum position or is downstream of the range.
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公开(公告)号：US20240142897A1
公开(公告)日：2024-05-02
申请号：US18497980
申请日：2023-10-30
发明人： Takeshi ARAKAWA
CPC分类号： G03G15/0921 , G03G9/0815 , G03G9/1087
摘要： A development device includes an accommodation section that accommodates a developer and a developer bearing member that carries the developer in the accommodation section. The developer bearing member includes a magnetic member and a sleeve provided around the magnetic member rotatably around the magnetic member. The sleeve includes a metal substrate with a surface having projections and recesses and a plating layer covering the surface of the metal substrate. The plating layer contains chromium and cobalt. The developer contains a toner and the toner includes toner particles. The toner particles each include a toner mother particle and external additive particles attached to the surface of the toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The external additive particles include alumina particles with surfaces that are hydrophobized.
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公开(公告)号：US20240069470A1
公开(公告)日：2024-02-29
申请号：US18388309
申请日：2023-11-09
发明人： Chihiro Tanaka
IPC分类号： G03G15/09 , G03G15/01 , G03G15/08 , G03G15/095
CPC分类号： G03G15/0921 , G03G15/0121 , G03G15/0808 , G03G15/0812 , G03G15/0818 , G03G15/09 , G03G15/0928 , G03G15/095
摘要： A developing device includes a developing container, a developing roller, a supplying roller, a first magnet including a first magnetic pole, a second magnet including second to fifth magnetic poles, and a regulating member. A maximum magnetic flux density of the second magnetic pole is larger in absolute value than a maximum magnetic flux density of the third magnetic pole in a normal direction to the supplying roller, and a maximum magnetic flux density of the third magnetic pole is larger in absolute value than a maximum magnetic flux density of the fourth magnetic pole in the normal direction. With respect to a rotational direction of the supplying roller, an angle between maximum magnetic flux density positions of the second and third magnetic poles is smaller than an angle between maximum magnetic flux density positions of the third and fourth magnetic poles.
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公开(公告)号：US11874615B2
公开(公告)日：2024-01-16
申请号：US17859669
申请日：2022-07-07
发明人： Tamotsu Shimizu , Akihiro Watanabe , Ryo Yamada , Uto Syu , Yuji Toyota , Yasuhiro Tauchi
CPC分类号： G03G15/0891 , G03G15/081 , G03G15/0921 , G03G2215/0609
摘要： A developing device includes a developing container, a first stirring conveyance member, a second stirring conveyance member, a developer carrying member including a developing sleeve and a magnet, and a regulation member. The regulation pole in the magnet has a region extending over 10° or more in which a maximum value of a vertical magnetic force is not more than 65 [mT] and a vertical magnetic force gradient is not more than 0.3 [mT/°]. A peak position of the vertical magnetic force gradient of the regulation pole is arranged at a position opposed to the second stirring conveyance member, and when a value of the vertical magnetic force gradient and a value of the vertical magnetic force at the peak position of the vertical magnetic force gradient are indicated as A [mT/°] and K [mT], respectively, A≥2.8 and A×K≥62.5 are satisfied.
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公开(公告)号：US20230408973A1
公开(公告)日：2023-12-21
申请号：US18331671
申请日：2023-06-08
CPC分类号： G03G21/206 , G03G15/09 , G03G21/10
摘要： An image forming apparatus includes an image carrier, a cleaning unit, a development device, and a control unit. The development device includes a toner collection mechanism having a developer carrier and a filter. The control unit is capable of executing a scattered toner recovery mode at non-image forming time, in which the filter is vibrated, a potential difference is generated in the direction for the toner to move from the developer carrier to the image carrier, the developer carrier is rotated in a reverse direction to that at image forming time, and the image carrier is rotated in the same direction as that at the image forming time, so that scattered toner, which has dropped from the filter and adhered to the developer carrier, is recovered by the cleaning unit via the image carrier.
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公开(公告)号：US11782356B2
公开(公告)日：2023-10-10
申请号：US17841049
申请日：2022-06-15
CPC分类号： G03G15/0812 , G03G21/1814 , G03G9/093
摘要： A developer used in a developing apparatus equipped with a metal blade includes a toner base particle and external additives, the external additives including a silica particle with a particle diameter of 5 nm or more and 25 nm or less and an inorganic spacer particle with a particle diameter of 50 nm or more and 150 nm or less, and an area occupancy of the silica particle on a surface of the toner base particle is 40% or more.
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公开(公告)号：US11774883B2
公开(公告)日：2023-10-03
申请号：US17591273
申请日：2022-02-02
CPC分类号： G03G15/0891 , G03G15/09 , G03G15/5004 , G03G21/20 , G03G21/206 , G03G2215/00084
摘要： An image forming apparatus to execute an image forming operation for forming an image includes an image bearing member, a development unit, a drive unit, a controller, and a humidity detection unit to detect humidity near the development unit. The development unit contains developer and includes a conveyance member to convey the developer and a developer carrying member to carry the developer to a position where an electrostatic latent image formed on the image bearing member is developed. The controller controls the conveyance and the developer carrying member through the drive unit not to execute a mode for driving the conveyance and the developer carrying member without executing the image forming operation when the humidity detected when power of the image forming apparatus is shifted from off to on is higher than a predetermined value, and to execute the mode when the detected humidity falls below the predetermined value afterward.
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