公开(公告)号：US20210240102A1

公开(公告)日：2021-08-05

申请号：US17165370

申请日：2021-02-02

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kazunori TANAKA ,  Kanako MORIMOTO ,  Tamotsu SHIMIZU ,  Kenichi TAMAKI

IPC: G03G15/08 ,  G03G15/16

Abstract: An image forming apparatus includes a toner charge amount predictor, a toner developing resistance calculator, and a determiner. The toner developing resistance calculator calculates a toner developing resistance on the basis of a bias voltage applied to a developing device and a measured developing current by dividing a value of the bias voltage by a value of the developing current when a developing device develops an electrostatic latent image formed on the surface of an image carrier to form a toner image. The toner charge amount predictor predicts a toner charge amount of a toner which is supplied to the image carrier by the developing device on the basis of a density of the toner image and the developing current. The determiner determines a state of the developing device on the basis of the toner charge amount and the toner developing resistance.

公开(公告)号：US20210041808A1

公开(公告)日：2021-02-11

申请号：US16984788

申请日：2020-08-04

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Takahiro OKUBO ,  Mitsuhiro HASHIMOTO ,  Kazuhiro NAKACHI ,  Shiro KANEKO

IPC: G03G15/16 ,  G03G15/00 ,  G03G15/20

Abstract: An image forming apparatus includes an image forming portion, a high-voltage generation circuit, a current detection portion and a control portion. The image forming portion includes an image carrying member, a charging device, an exposure device and a developing device which includes a developer carrying member for carrying a two-component developer. The control portion can perform a transfer memory prediction mode that includes a step of estimating, when a first reference image is formed, the level of occurrence of transfer memory based on the direct-current component of a development current flowing through the developer carrying member and a step of measuring, when the measured direct-current component of the development current is larger than a predetermined value, the amount of charge of the toner within the developing device and estimating the cause of occurrence of the transfer memory based on the measured amount of charge of the toner.

公开(公告)号：US20190072870A1

公开(公告)日：2019-03-07

申请号：US16182087

申请日：2018-11-06

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Hiroka ITANI ,  Kenichi TAMAKI

IPC: G03G15/02 ,  G03G21/06 ,  D02G3/12

CPC classification number: G03G15/0216 ,  D02G3/12 ,  G03G15/2014 ,  G03G21/06

Abstract: An image forming apparatus has an image carrier, an electrifying member, and a charge eliminating device, and eliminates remaining charge on the surface of the image carrier by the charge eliminating device. The charge eliminating device includes a discharge member. The discharge member includes an electro conductive knit fabric knitted in a cylindrical shape using twisted yarn made of twisted metal fibers and a support member having a cylindrical shape and inserted in the electro conductive knit fabric, and is disposed to face the image carrier in a noncontact manner. A magnet member is disposed inside the image carrier within a charge elimination nip width between two tangential lines of an outer circumference surface of the discharge member, the two tangential lines being parallel to a straight line passing through a rotation center of the image carrier and a center axis of the discharge member.

公开(公告)号：US20170277061A1

公开(公告)日：2017-09-28

申请号：US15464860

申请日：2017-03-21

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kenichi TAMAKI ,  Tamotsu SHIMIZU ,  Hiroka ITANI

IPC: G03G21/00

CPC classification number: G03G15/0241 ,  G03G15/6552 ,  G03G21/06

Abstract: A discharging member includes an electrically conductive knit fabric, a support member, and a first magnet member. The conductive knit fabric is knitted into a cylindrical shape with use of yarn formed by twisting together a plurality of metal fibers. The support member is cylindrical shaped and inserted in the conductive knit fabric. The first magnet member is placed inside the support member. With the conductive knit fabric grounded or with a voltage applied to the conductive knit fabric, the discharging member is placed in noncontact with a discharged member in such a fashion that the first magnet member is opposed to the discharged member with the support member and the conductive knit fabric interposed therebetween.

公开(公告)号：US20170269498A1

公开(公告)日：2017-09-21

申请号：US15460736

申请日：2017-03-16

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Hiroka ITANI ,  Kenichi TAMAKI

IPC: G03G21/00

CPC classification number: G03G15/0216 ,  D02G3/12 ,  G03G15/2014 ,  G03G21/06

Abstract: A discharge member includes an electro conductive knit fabric and a support member. The electro conductive knit fabric is knitted in a cylindrical shape using twisted yarn made of twisted metal fibers. The support member is cylindrical and is inserted in the electro conductive knit fabric. The discharge member is disposed to face a member to be discharged in a noncontact manner, in a state where the electro conductive knit fabric is grounded or a voltage is applied to the electro conductive knit fabric.

公开(公告)号：US20240241461A1

公开(公告)日：2024-07-18

申请号：US18575982

申请日：2022-03-31

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Kohei TERASAKI ,  Yuma UCHIHASHI ,  Eriko TAKEUCHI

IPC: G03G9/113 ,  G03G9/08 ,  G03G9/097

CPC classification number: G03G9/1136 ,  G03G9/0819 ,  G03G9/09733 ,  G03G9/1139

Abstract: In a two-component developer, external additive particles of toner particles include resin particles containing a thermoplastic resin. Coat layers of carrier particles contain a coating resin and barium titanate particles. The coating resin includes a silicone resin. The barium titanate particles have a number average primary particle diameter of 100-500 nm. The barium titanate particles have a content of 4-45 parts by mass relative to 100 parts by mass of the coating resin. The rate of the mass of the coat layers to the mass of the carrier cores is 0.10-4.90% by mass. The average of coverage rates of the carrier cores is at least 80.0% and less than 100.0%.

公开(公告)号：US20240176289A1

公开(公告)日：2024-05-30

申请号：US18517567

申请日：2023-11-22

Applicant: KYOCERA Document Solutions Inc.

Inventor： Kenichi TAMAKI ,  Tamotsu SHIMIZU ,  Hiroshi YAMAZAKI ,  Junichi NAKAGAWA ,  Takuji WATANABE

IPC: G03G21/20 ,  G03G15/09

CPC classification number: G03G21/206 ,  G03G15/0921

Abstract: A developing device includes a developer container and a developer carrying member. The developer carrying member includes a shaft, a sleeve that rotates while carrying toner on its outer circumferential face, and a magnet that extends along the axis of the developer carrying member. The developer container includes a duct, an intake port which opens above the developer carrying member and through which the inside of the developer container and the inside of the duct communicate with each other, and a first filter that covers the intake port. The edges of the first filter at one side and at the other side in the axial direction of the developer carrying member are both located within a range opposite the magnet as seen from the direction perpendicular to the axial direction.

公开(公告)号：US20240176271A1

公开(公告)日：2024-05-30

申请号：US18521156

申请日：2023-11-28

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Hiroshi YAMAZAKI ,  Kenichi TAMAKI ,  Junichi NAKAGAWA ,  Takuji WATANABE

IPC: G03G15/00 ,  G03G15/095 ,  G03G21/20

CPC classification number: G03G15/50 ,  G03G15/095 ,  G03G21/206

Abstract: The image forming apparatus includes a developing part and a vibration generating part. The vibration generating part vibrates a filter provided in the developing part. The developing part includes a development container, a developer carrier, and a toner trapping mechanism. The development container includes a first conveyance chamber and a second conveyance chamber placed in parallel juxtaposition. The toner trapping mechanism has a duct, an air inlet port, an air exhaust port, and a filter. The air inlet port is opened along the longitudinal direction of the second conveyance chamber so as to allow air present in the second conveyance chamber to flow into the duct. The vibration generating part is placed outside the developing part so as to be opposed to the development container and positioned on a downstream side in a developer conveyance direction of the second conveyance chamber.

公开(公告)号：US20230408975A1

公开(公告)日：2023-12-21

申请号：US18332249

申请日：2023-06-09

Applicant: KYOCERA Document Solutions Inc.

Inventor： Hiroshi YAMAZAKI ,  Junichi NAKAGAWA ,  Tamotsu SHIMIZU ,  Kenichi TAMAKI ,  Takuji WATANABE

IPC: G03G21/20

CPC classification number: G03G21/206

Abstract: Provided is an image forming apparatus that is capable of carrying out a scattered-toner recovery mode in which, while image formation is prevented from being performed, scattered toner that has dropped from a filter and adhered to an outer peripheral surface of a developer carrying member is recovered by a cleaning unit through intermediation of an image bearing member. A fixed magnet of the developer carrying member has a first pole that faces the image bearing member, a second pole that faces the filter, and an intermediate pole between the first pole and the second pole.

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.