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

IPC: G03G15/02 ,  G03G15/06 ,  G03G15/00

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.

公开(公告)号：US20230039831A1

公开(公告)日：2023-02-09

申请号：US17863032

申请日：2022-07-12

Applicant: KYOCERA Document Solutions Inc.

Inventor： Masashi FUJISHIMA ,  Norio KUBO

IPC: G03G15/095 ,  G03G21/10

Abstract: An image forming apparatus includes an image supporter, a development unit, a cleaning unit, a collection unit, and a controller. The collection unit includes a collection path where a developer discharge path for transport of a waste developer from a discharger of the development unit and a toner discharge path for transport of waste toner from the cleaning unit merge with each other, and collects the waste developer including the waste toner and waste carrier. A place of a high flow resistance is formed at least partially at the collection path. If the weight ratio of the waste carrier to the waste toner included in the waste developer in the collection path is less than a predetermined value, the controller performs carrier discharge process of moving the carrier from the development unit to the image supporter and removing and discharging the carrier using the cleaning unit during non-image formation.

公开(公告)号：US20210364951A1

公开(公告)日：2021-11-25

申请号：US17322198

申请日：2021-05-17

Applicant: KYOCERA Document Solutions Inc.

Inventor： Asami SASAKI ,  Akira MATAYOSHI ,  Norio KUBO ,  Koji SUENAMI ,  Yuji TOYOTA ,  Tamotsu SHIMIZU ,  Masashi FUJISHIMA ,  Yasuhiro TAUCHI

IPC: G03G15/08

Abstract: A developing device includes a developer container, a developer carrier, and first and second members for stirring/conveying. The developer container includes a first partition wall between first and second chambers, a communication portion through which those chambers communicate at opposite ends of the first partition wall, a developer supply port, and a developer discharge portion. The first member stirs and conveys developer in the first chamber in a first direction. The second member stirs and conveys developer in the second chamber in a second direction and includes a regulating portion and a discharging blade. The developer container includes a second partition wall between the first chamber and the regulating portion. The gap from the upper end of the second partition wall to the inner surface of the developer container is larger than the gap thereto from the upper ends of a first helical blade and the regulating portion.

公开(公告)号：US20210364944A1

公开(公告)日：2021-11-25

申请号：US17322298

申请日：2021-05-17

Applicant: KYOCERA Document Solutions Inc.

Inventor： Masashi FUJISHIMA ,  Norio KUBO ,  Asami SASAKI ,  Yasuhiro TAUCHI ,  Tamotsu SHIMIZU ,  Akira MATAYOSHI ,  Masaki KADOTA ,  Koji SUENAMI ,  Yuji TOYOTA

IPC: G03G15/08

Abstract: A developing device includes a developer container, a developer carrier, and first and second stirring/conveying members. The developer container includes a first partition wall partitioning between the two conveying chambers longitudinally, a first communication portion for passing developer from the first to the second conveying chamber, a second communication portion for passing developer from the second to the first conveying chamber, a developer supply port for supplying developer in, a developer discharge portion for discharging excessive developer, a second partition wall arranged, adjacent to the regulating portion, downstream of the second communication portion to partition between the first conveying chamber and the regulating portion, and a shield portion connected to the two partition walls to bridge between them to shield a top part of the second communication portion. A gap is formed between an upper end part of the shield portion and the inner surface of the developer container.

公开(公告)号：US20240069456A1

公开(公告)日：2024-02-29

申请号：US18458982

申请日：2023-08-30

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kohei TERASAKI ,  Norio KUBO ,  Yuji TOYOTA ,  Akira MATAYOSHI

IPC: G03G9/083 ,  G03G9/09 ,  G03G9/113 ,  G03G15/08

CPC classification number: G03G9/0833 ,  G03G9/0904 ,  G03G9/1139 ,  G03G15/0867

Abstract: Toner particles in a developer include first strontium titanate particles attached to the surface of each toner mother particle thereof. The first strontium titanate particles have a content ratio of 0.3 to 0.9 parts by mass to 100.0 parts by mass of the toner mother particles. In the developer, coat layers of carrier mother particles of first carrier particles contain barium titanate particles and a coating resin including silicone resin. The barium titanate particles have a content ratio of 2 to 47 parts by mass to 100 parts by mass of the coating resin. Second strontium titanate particles attached to the surfaces of the carrier mother particles have a diameter of 15 to 85 nm.

公开(公告)号：US20160077464A1

公开(公告)日：2016-03-17

申请号：US14838359

申请日：2015-08-27

Applicant: KYOCERA Document Solutions Inc.

Inventor： Asami SASAKI ,  Masaru HATANO ,  Norio KUBO

IPC: G03G15/08

CPC classification number: G03G15/0896 ,  G03G15/0818 ,  G03G15/0865 ,  G03G21/0052 ,  G03G21/206

Abstract: A developing device includes a developing container, a toner carrier, and a plurality of air outlet ports. The plurality of air outlet ports are formed in such part of a wall of the developing container as faces the toner carrier, along a longitudinal direction of the developing container, the air outlet ports communicating with a duct next to the developing container. The toner carrier includes a coat layer on the outer circumferential surface thereof. The coat layer is formed by dripping the toner carrier into a resin coating liquid with one end in the longitudinal direction thereof first, the one end being a lower end of during the dipping, and then lifting the toner carrier out of the resin coating liquid. The toner carrier is arranged such that the lower end of during the dipping is disposed on an upstream side with respect to an airflow direction in the duct.

Abstract translation: 显影装置包括显影容器，调色剂载体和多个空气出口。 多个空气出口端口沿显影容器的纵向方向形成在显影容器的壁的与调色剂载体相对面的一部分中，空气出口与与显影容器相邻的管道连通。 调色剂载体在其外圆周表面上包括涂层。 涂层通过将调色剂载体滴落到树脂涂布液中而形成，其一端沿其长度方向一端，一端为浸渍时的下端，然后将调色剂载体从树脂涂布液中提出。 调色剂载体布置成使得浸渍期间的下端相对于管道中的气流方向设置在上游侧。

公开(公告)号：US20230288863A1

公开(公告)日：2023-09-14

申请号：US18117572

申请日：2023-03-06

Applicant: KYOCERA Document Solutions Inc.

Inventor： Masashi FUJISHIMA ,  Norio KUBO ,  Koji SUENAMI

IPC: G03G15/00

CPC classification number: G03G15/757 ,  G03G15/556 ,  G03G2215/00037

Abstract: An image forming apparatus includes: a gear provided on a transmission path of driving force from a drive unit to a photoreceptive drum; a first acquisition processor to acquire a charged amount of toner; a formation processor to form a toner image for detection based on an image for detection with density according to the charged amount of toner acquired by the first acquisition processor among a plurality of images for detection having different color from each other for every time when a specific formation timing arrives; a second acquisition processor to acquire a variation width of density in the toner image for detection formed by the formation processor; and a determination processor to determine a failure timing of the gear based on the variation width for each formation timing corresponding to any one of the plurality of images for detection.

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.

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

IPC: G03G15/09 ,  G03G15/08 ,  G03G15/06

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.

公开(公告)号：US20180253033A1

公开(公告)日：2018-09-06

申请号：US15890702

申请日：2018-02-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Masashi FUJISHIMA ,  Norio KUBO ,  Junichi NAKAGAWA ,  Asami SASAKI

IPC: G03G15/08

CPC classification number: G03G15/0891 ,  G03G15/0829 ,  G03G15/0849 ,  G03G15/0853 ,  G03G15/0865 ,  G03G15/0889 ,  G03G15/0893 ,  G03G15/095 ,  G03G2215/0607 ,  G03G2215/066 ,  G03G2215/0819 ,  G03G2215/083 ,  G03G2221/0005

Abstract: A developing device includes a developing container, first and second stirring-conveyance members, a developer carrier, a toner concentration sensor, a scraper, and a scraper attachment unit. The second stirring-conveyance member includes a rotation shaft, a first spiral blade to convey developer in an axial direction, and a second spiral blade to overlap a region where the first spiral blade is formed, which is opposite to the first spiral blade in phase, and lower than the first spiral blade in height in a radial direction. An absent region, where the second spiral blade does not exist, is formed in one pitch of the first spiral blade, the one pitch facing the toner concentration sensor. The scraper attachment unit is formed to extend, along a straight line passing through intersection points of the first and second spiral blades and parallel to the rotation shaft, into the absent region.