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公开(公告)号：US20220057727A1
公开(公告)日：2022-02-24
申请号：US17403148
申请日：2021-08-16
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Masashi FUJISHIMA , Akira MATAYOSHI , Yasuhiro TAUCHI , Yuji TOYOTA , Norio KUBO
Abstract: An image forming apparatus includes an image carrier, a charging device, an exposure device, a development device, a transferring part, a development bias applying part, an electric current detection part, a density detection part and a bias condition determination part. The bias condition determination part performs a DC voltage determination mode (a DC calibration) determining a reference DC voltage serving as a reference of a DC voltage of a development bias applied to a development roller and a peak-to-peak voltage determination mode (an AC calibration) determining a reference peak-to-peak voltage serving as a reference of a peak-to-peak voltage of an AC voltage of the development bias. When a difference between the reference DC voltages determined the successive DC voltage determination modes exceeds a predetermined threshold value, the bias condition determination part performs the peak-to-peak determination mode.
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公开(公告)号：US20210255566A1
公开(公告)日：2021-08-19
申请号：US17171357
申请日：2021-02-09
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Yasuhiro TAUCHI , Akira MATAYOSHI , Masashi FUJISHIMA
Abstract: A bias condition determination portion of an image forming device executes each of: a first approximation expression determination operation that respectively acquires the DC component of the development current with at least three peak-to-peak voltages included in a first measurement range and determines a first expression showing a relation between the peak-to-peak voltage and the DC component of the acquired development current, a second approximation expression determination operation that respectively acquires the DC component of the development current with at least three peak-to-peak voltages included in a second measurement range larger than the first measurement range and determines a second approximation expression showing a relation between the peak-to-peak voltage and the DC component of the acquired development current, and a reference voltage determination operation that determines, as a reference peak-to-peak voltage, the peak-to-peak voltage at an intersection where the first approximation expression and the second approximation expression intersect each other.
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公开(公告)号：US20230034149A1
公开(公告)日：2023-02-02
申请号：US17859307
申请日：2022-07-07
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Yuji TOYOTA , Yasuhiro TAUCHI
Abstract: A developing device includes a developing container storing a two-component developer, a developer carrying member, and a regulation member. The developer carrying member includes a developing sleeve, and a magnet having a regulation pole opposite the regulation member and a main pole opposite the image carrying member. The regulation member is arranged downstream of the position at which the vertical magnetic force of the regulation pole is 0 [mT] but upstream of a position at which the vertical and horizontal magnetic forces of the regulation pole are equal. Let the horizontal magnetic force gradient at the position at which the horizontal magnetic force of the main pole is 0 [mT] be A and the horizontal magnetic force gradient at the upstream-side surface of the regulation member along the rotation direction of the developing sleeve be B, then |A|>2.45 and |B|
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公开(公告)号：US20230030358A1
公开(公告)日：2023-02-02
申请号：US17858537
申请日：2022-07-06
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Yuji TOYOTA , Yasuhiro TAUCHI
Abstract: A developing device includes a developing container storing a two-component developer containing a magnetic carrier and a toner, a developer carrying member carrying the developer on its outer circumferential surface, and a regulation member arranged to be opposed at a prescribed distance to the developer carrying member. The developer carrying member includes a developing sleeve on which a magnetic brush is formed, and a magnet secured in the developing sleeve and having a plurality of magnetic poles including a regulation pole opposed to the regulation member and a downstream-side magnetic pole arranged downstream of the regulation pole with respect to the rotation direction of the developing sleeve. The magnet is such that the vertical magnetic force gradient [mT/° ] has a local minimum value near a position at which the vertical magnetic force is 0 [mT] between the downstream-side surface of the regulation member and the downstream-side magnetic pole.
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公开(公告)号：US20150063856A1
公开(公告)日：2015-03-05
申请号：US14467552
申请日：2014-08-25
Applicant: KYOCERA Document Solutions Inc.
Inventor： Kazuya YAMASHITA , Kosuke UCHIDA , Yasuhiro TAUCHI
CPC classification number: G03G21/206 , G03G15/6529 , G03G2221/1645
Abstract: An image forming apparatus includes a sheet conveyance passage, a photosensitive drum, a transfer unit, a fixing section, a conveyance unit, one or more detection sensors, an airflow generating section, a cooling airflow passage, and a shielding member. The conveyance unit is at an opposite side of the transfer unit from the photosensitive drum with a predetermined clearance from the transfer unit. Each detection sensor is disposed to face the transfer unit in cross section intersecting the axial direction of the photosensitive drum. The sheet detection sensor performs a predetermined detection. The airflow generating section causes a cooling airflow to flow between the transfer unit and the conveyance unit in the axial direction. The cooling airflow passage guides the cooling airflow toward each detection sensor. The shielding member blocks an airflow from a location around the transfer unit toward the cooling airflow passage in a direction intersecting the axial direction.
Abstract translation: 图像形成装置包括片材输送通道，感光鼓，转印单元，固定部分，输送单元，一个或多个检测传感器，气流发生部分，冷却气流通道和屏蔽部件。 传送单元与转印单元相对于来自感光鼓的与传送单元具有预定间隙的相反侧。 每个检测传感器设置成在与感光鼓的轴向相交的横截面中面对转印单元。 纸张检测传感器执行预定的检测。 气流发生部使冷却气流在轴向上在转印单元和输送单元之间流动。 冷却气流通道朝向每个检测传感器引导冷却气流。 屏蔽构件在与轴向交叉的方向上阻挡从传送单元周围的位置朝向冷却气流通道的气流。
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Patent Agency Ranking
公开(公告)号：US20230026905A1
公开(公告)日：2023-01-26
申请号：US17858446
申请日：2022-07-06
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Kazunori TANAKA , Yasuhiro TAUCHI
IPC: G03G15/00
Abstract: An image forming apparatus includes an amorphous silicon photosensitive member, a developing device including a developer carrying member that carries a two-component developer, and a control portion. When a potential difference V0−Vdc between the photosensitive member and the developer carrying member has a first potential difference at which the toner is moved from the developer carrying member to the photosensitive member and a second potential difference at which the toner is moved from the photosensitive member to the developer carrying member, the control portion adjusts V0 or Vdc so that the first potential difference and the second potential difference are equal in value and opposite in polarity, and a first development current |Ia| that flows at the first potential difference and a second development current |Ib| that flows at the second potential difference satisfy 1.9×10−2≥|Ib|/N≥5.7×103 [μA/mm].
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公开(公告)号：US20230022669A1
公开(公告)日：2023-01-26
申请号：US17859669
申请日：2022-07-07
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Akihiro WATANABE , Ryo YAMADA , Uto SYU , Yuji TOYOTA , Yasuhiro TAUCHI
Abstract: 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：US20150293470A1
公开(公告)日：2015-10-15
申请号：US14671344
申请日：2015-03-27
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Akihiro WATANABE , Chikara ISHIHARA , Yasuhiro TAUCHI , Masashi FUJISHIMA , Yu SASAKI , Hiroaki SAKAI , Yasuhiro OISHI , Yukimasa WATANABE
IPC: G03G15/08
CPC classification number: G03G15/0808
Abstract: A developing device includes a housing, a development roller, and a roller gear. The roller gear is disposed at one axial end of the development roller and transmits a rotational drive force to the development roller. The development roller includes a sleeve and a coating layer. The coating layer is formed by dipping the sleeve in a dipping bath with the sleeve directed axially vertically. The development roller is mounted to the housing such that a lower axial end of the development roller at the time of the dipping is an opposite axial end to the one axial end at which the roller gear is disposed.
Abstract translation: 显影装置包括壳体，显影辊和辊齿轮。 辊齿轮设置在显影辊的一个轴向端部，并将旋转驱动力传递到显影辊。 显影辊包括套筒和涂层。 通过将套筒浸入浸渍浴中而使套筒轴向垂直地形成涂层。 显影辊安装到壳体上，使得在浸渍时显影辊的下轴向端与设置辊齿轮的一个轴向端相反的轴向端。
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公开(公告)号：US20210302866A1
公开(公告)日：2021-09-30
申请号：US17206248
申请日：2021-03-19
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Norio KUBO , Asami SASAKI , Yasuhiro TAUCHI , Yuji TOYOTA
IPC: G03G15/06
Abstract: A bias condition determiner executes a direct current voltage determination mode (DC calibration) for determining a reference direct current voltage that is a reference for a direct current voltage of a developing bias applied to a developing roller in an image forming operation and an inter-peak voltage determination mode (AC calibration) for determining a reference inter-peak voltage that is a reference for an inter-peak voltage of an alternating current voltage of the developing bias applied to the developing roller in the image forming operation. A calibration executor determines whether the inter-peak voltage determination mode needs to be executed in accordance with a value of the reference direct current voltage.
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公开(公告)号：US20210173330A1
公开(公告)日：2021-06-10
申请号：US17113063
申请日：2020-12-06
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yuji TOYOTA , Yasuhiro TAUCHI , Masashi FUJISHIMA , Norio KUBO , Akira MATAYOSHI
Abstract: Provided is an image forming apparatus capable of suppressing the occurrence of image defects in response to a difference in carrier resistance and obtaining high image quality. A developing unit has a developing roller that carries the toner in a two-component developer that includes a toner and a magnetic carrier on the surface thereof, and forms a toner image on the surface of a photosensitive drum. A current detecting unit detects developing current flowing between the developing roller and the photosensitive drum when a developing voltage is applied to the developing roller by a developing power supply. When the developing voltage is applied to the photosensitive drum, the control unit derives a carrier resistance based on the developing current detected by a current detecting unit, and controls the AC amplitude of the AC voltage of the development voltage is based on the carrier resistance.
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