公开(公告)号：US12271125B2

公开(公告)日：2025-04-08

申请号：US18565738

申请日：2022-03-28

Applicant: KYOCERA Document Solutions Inc.

Inventor： Ryo Yamada

IPC: G03G15/08 ,  B01D39/16 ,  G03G21/20

Abstract: A developing device (3a-3d) is provided with a development container (20), a first stirring conveyance member (25), a second stirring conveyance member (26), and a developer carrier (31). The development container (20) has a first conveyance chamber (21), a second conveyance chamber (22), and a communication portion (20). The first stirring conveyance member (25) includes a first rotation shaft (23a) and a first stirring blade (24a). The second stirring conveyance member (26) includes a second rotation shaft (23b) and a second stirring blade (24b). The developer carrier (31) is opposed to the second stirring conveyance member (26). The first rotation shaft (23a) includes, at least in a partial region in an axial direction of the first rotating shaft (23a), a tapered portion (36) of which a shaft diameter increases toward a downstream side in a developer conveyance direction in the first conveyance chamber (21).

公开(公告)号：US11874615B2

公开(公告)日：2024-01-16

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

IPC: G03G15/08 ,  G03G15/09

CPC classification number: G03G15/0891 ,  G03G15/081 ,  G03G15/0921 ,  G03G2215/0609

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.

公开(公告)号：US12271123B2

公开(公告)日：2025-04-08

申请号：US18598367

申请日：2024-03-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Ryo Yamada

IPC: G03G15/00 ,  G03G9/107 ,  G03G15/08

Abstract: An image forming apparatus includes an image carrying member, a charging device, an exposure device, a development device, a development voltage power supply, a humidity detection device and a controller. The exposure device exposes the surface of the image carrying member charged by the charging device to form an electrostatic latent image. The development device includes a development container which stores a developer including a toner and a developer carrying member which supplies, to the image carrying member, the toner in the developer, and develops the electrostatic latent image into a toner image. The development voltage power supply applies, to the developer carrying member, a development voltage with an alternating voltage superimposed on a direct voltage. The humidity detection device detects an absolute humidity around the development device. The controller stepwise increases the frequency of the alternating voltage as the absolute humidity detected by the humidity detection device is increased.

公开(公告)号：US11150578B2

公开(公告)日：2021-10-19

申请号：US16995574

申请日：2020-08-17

Applicant: KYOCERA Document Solutions Inc.

Inventor： Minoru Wada ,  Yuji Kamiyama ,  Ikuo Makie ,  Yu Sasaki ,  Yukari Ota ,  Ryo Yamada

IPC: G03G15/08 ,  G03G21/20

Abstract: A developing device includes a developing container, a first stirring member and a second stirring member, and a developing roller. The developing container includes a first stirring chamber, a second stirring chamber, and a communication portion. The first stirring member includes a reverse spiral vane that conveys a developer in a direction reverse to a circulation direction. An air discharge duct is formed on a wall portion of the first stirring chamber opposed to the reverse spiral vane and in an area excluding the communication portion and discharges air from the first stirring chamber to an outside of the developing container via an air discharge port at a distal end of the air discharge duct. A filtration portion is disposed in the air discharge duct adjacently to the air discharge port and restricts leakage of the developer through the air discharge port.

公开(公告)号：US11112730B2

公开(公告)日：2021-09-07

申请号：US17031152

申请日：2020-09-24

Applicant: KYOCERA Document Solutions Inc.

Inventor： Ryo Yamada ,  Yuji Kamiyama ,  Yu Sasaki ,  Ikuo Makie

IPC: G03G15/08

Abstract: A developing device includes a developer container, a developer carrier, and a stirring/conveying member. The developer container stores developer containing toner. The developer carrier carries on its surface the toner in the developer container. The stirring/conveying member includes a rotary shaft rotatably supported on the developer container and a stirring blade formed around the outer circumferential face of the rotary shaft and stirs and conveys the developer in the developer container. The stirring/conveying member to be used can be selected from a plurality of types of stirring/conveying members with rotary shafts with different shaft diameters.