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公开(公告)号：US20220035271A1
公开(公告)日：2022-02-03
申请号：US17376300
申请日：2021-07-15
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masashi Wakisaka
Abstract: A third communicating portion is disposed downstream of the first communicating portion and upstream of the second communicating portion in the first direction. The third communicating portion is disposed above a rotational axis of a first conveyance screw and a rotational axis of a second conveyance screw in a vertical direction. The third communicating portion is configured to allow air inside the developing container to move between the first chamber and the second chamber. An opening portion for discharging the air inside the developing container outside the developing container is disposed above the second chamber in the vertical direction.
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公开(公告)号：US20190243280A1
公开(公告)日：2019-08-08
申请号：US16260612
申请日：2019-01-29
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masashi Wakisaka , Yusuke Ishida , Takanori Iida , Katsuya Nose , Yuta Okuyama
CPC classification number: G03G15/086 , G03G15/0849 , G03G15/09
Abstract: A first amount of developer is sealed in a container of a developing unit in an initial state where the developing unit is not yet used. A discharge portion is configured to discharge the developer from the container in a case where the developer contained in the container exceeds a predetermined amount greater than the first amount. A permeability sensor is configured to output a detection signal correlated with a magnetic permeability of the developer within the container. A controller is configured to use different values of a control signal, for adjusting an input-output relationship between the magnetic permeability of the developer in the container and the detection signal output from the permeability sensor, in a state where a second amount greater than the first amount of the developer is contained in the container and in a state where the first amount of the developer is contained in the container.
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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
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masashi Wakisaka
CPC classification number: G03G15/0891 , G03G15/0882 , G03G15/0893 , G03G15/09 , G03G21/206 , G03G2215/0609 , G03G2215/0687 , G03G2215/0819 , G03G2215/0827 , G03G2215/0838
Abstract: 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：US20190265612A1
公开(公告)日：2019-08-29
申请号：US16281288
申请日：2019-02-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yusuke Ishida , Takanori Iida , Masashi Wakisaka , Katsuya Nose , Yuta Okuyama
IPC: G03G15/08
Abstract: An image forming apparatus includes a density detecting portion configured to detect a density of a control toner image being formed every time when an image is formed on a predetermined number of sheets in successively forming the image on sheets, and a control portion configured to control an amount of supplying developer. The control portion controls forming of the control toner image so that the predetermined number of image-formed sheets is a first number in a period of time from when the use of a developing apparatus is started, until when an amount of developer of the developing apparatus reaches a set value which is larger than an amount of initial developer, and the predetermined number of image-formed sheets is a second number which is larger than the first number of image-formed images, after the amount of developer of the developing apparatus reaches the set value.
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Patent Agency Ranking
公开(公告)号：US20230400795A1
公开(公告)日：2023-12-14
申请号：US18139466
申请日：2023-04-26
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masashi Wakisaka
CPC classification number: G03G15/0891 , G03G15/0851 , G03G15/80 , G03G2215/0617
Abstract: Disclosed is a developing device including a conveying screw and an inductance sensor. The inductance sensor includes a detector detecting magnetic permeability of the developer accommodated in a developing container and has such detection sensitivity that the detection sensitivity with which the detector detects magnetic permeability when a magnetic material is disposed at a position 1 mm away from the detector in a vertical direction is 10% or more of that when magnetic material is disposed at a position which is in contact with the detector. The conveying screw includes a rotary shaft; a blade which is spirally formed on an outer circumference of the rotary shaft; and a rib formed as to protrude outwardly from the outer circumference of the rotary shaft. The rib is disposed opposite the detector with respect to a conveying direction of the conveying screw. The rib is provided with a magnet.
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公开(公告)号：US11556077B2
公开(公告)日：2023-01-17
申请号：US17589640
申请日：2022-01-31
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tomoyuki Sakamaki , Hideki Fujita , Osamu Ariizumi , Masashi Wakisaka , Chihiro Tanaka , Masashi Abe
IPC: G03G15/08
Abstract: An image formation apparatus includes an image-bearing member, an exposure device, an electro-conductive member, a bias application unit and a development device having a development roller and a toner supply roller. The bias application unit configured to apply biases to the toner supply roller, the development roller, and the electro-conductive member during image formation so that a first potential difference between the toner supply roller and the development roller and a second potential difference between the electro-conductive member and the development roller cause normally charged toner to travel respectively from the toner supply roller and the electro-conductive member to the development roller, and a third potential difference between the electro-conductive member and the toner supply roller causes normally charged toner to travel from the electro-conductive member to the toner supply roller. The second potential difference is larger than the first potential difference and is larger than the third potential difference.
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公开(公告)号：US20220260947A1
公开(公告)日：2022-08-18
申请号：US17589640
申请日：2022-01-31
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tomoyuki Sakamaki , Hideki Fujita , Osamu Ariizumi , Masashi Wakisaka , Chihiro Tanaka , Masashi Abe
Abstract: An image formation apparatus includes an image-bearing member, an exposure device, an electro-conductive member, a bias application unit and a development device having a development roller and a toner supply roller. The bias application unit configured to apply biases to the toner supply roller, the development roller, and the electro-conductive member during image formation so that a first potential difference between the toner supply roller and the development roller and a second potential difference between the electro-conductive member and the development roller cause normally charged toner to travel respectively from the toner supply roller and the electro-conductive member to the development roller, and a third potential difference between the electro-conductive member and the toner supply roller causes normally charged toner to travel from the electro-conductive member to the toner supply roller. The second potential difference is larger than the first potential difference and is larger than the third potential difference.
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公开(公告)号：US12124191B2
公开(公告)日：2024-10-22
申请号：US18139466
申请日：2023-04-26
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masashi Wakisaka
CPC classification number: G03G15/0891 , G03G15/0851 , G03G15/0853 , G03G15/80 , G03G15/086 , G03G2215/0607 , G03G2215/0617 , G03G2215/0888
Abstract: A developing device includes a developer bearing member, a developing container which accommodates developer, a conveying screw which conveys the developer accommodated in the developing container, and an inductance sensor which includes a detecting portion which detects magnetic permeability of the developer accommodated in the developing container. The conveying screw includes a rotary shaft, a blade which is spirally formed on an outer circumference of the rotary shaft, and a rib formed to protrude outwardly from the outer circumference of the rotary shaft. The rib is disposed opposite the detection portion with respect to a conveying direction of the conveying screw and is provided with a magnet, with magnetic flux density of the magnet being in the range of 20 mT to 60 mT.
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公开(公告)号：US10831128B2
公开(公告)日：2020-11-10
申请号：US16281288
申请日：2019-02-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yusuke Ishida , Takanori Iida , Masashi Wakisaka , Katsuya Nose , Yuta Okuyama
Abstract: An image forming apparatus includes a control portion, and in a first period from when use of a developing apparatus is started until when an amount of developer in a developing device reaches a predetermined amount larger than an amount of initial developer, when an amount of developer supplied from a supplying portion through a single supplying operation in an image forming operation is larger than a predetermined supplied amount, the control portion interrupts the image forming operation and drives a conveyance portion for a predetermined time. In a second period after the amount of the developer reaches the predetermined amount, when an amount of the supplying developer supplied through a single supplying operation in the image forming operation is larger than the predetermined supplied amount, the control portion continues the image forming operation without interruption.
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