公开(公告)号：US09665037B2

公开(公告)日：2017-05-30

申请号：US15228791

申请日：2016-08-04

Applicant: KYOCERA Document Solutions Inc.

Inventor： Shinji Otani ,  Yukari Ota ,  Yasuhiro Tauchi ,  Takashi Somete ,  Yoshimi Shimizu

IPC: G03G15/08

CPC classification number: G03G15/081 ,  G03G15/0812 ,  G03G15/0815 ,  G03G15/09

Abstract: A developing device includes a developing roller, a toner supplying roller, a regulation blade, a casing, a toner receiver support member, a toner receiver member, and a vibration generator. The toner receiver member is disposed along a longitudinal direction of the toner receiver support member facing the developing roller, and has a toner receiving surface inclined downward from the image-carrier side toward the toner-supplying-roller side. The toner receiving surface is disposed to be inclined so as to rise from the toner-supplying-roller side toward the image-carrier side. The toner receiving surface has a plurality of grooves formed therein to be inclined to approach a center part of the toner receiving surface from each end side of the toner receiving surface in its longitudinal direction, from an edge of the toner receiving surface on the image-carrier side toward an edge of the toner receiving surface on the toner-supplying-roller side.

公开(公告)号：US20160306292A1

公开(公告)日：2016-10-20

申请号：US15098229

申请日：2016-04-13

Applicant: KYOCERA Document Solutions Inc.

Inventor： Yasuhiro Tauchi ,  Yukari Ota

IPC: G03G15/09

CPC classification number: G03G15/0877 ,  G03G15/065 ,  G03G15/0808 ,  G03G15/0812

Abstract: A developing device includes a toner carrying member, a developer carrying member, a layer thickness restricting portion, a rotation control portion, and a developer carrying member difference voltage control portion. The rotation control portion, when developing is not performed, causes the developer carrying member to rotate forwardly and then to rotate reversely. The developer carrying member difference voltage control portion, in the non-developing forward rotation state, sets a voltage of the developer carrying member that is based on a potential of the toner carrying member, to a voltage that is smaller than a first reference voltage that is set when the developing is performed. The non-developing forward rotation state is a state in which the developer carrying member rotates forwardly when the developing is not performed.

Abstract translation: 显影装置包括调色剂承载构件，显影剂承载构件，层厚度限制部分，旋转控制部分和显影剂承载构件差异电压控制部分。 旋转控制部在不进行显影时，使显影剂承载构件向前旋转，然后反转。 显影剂承载构件差动电压控制部分处于非显影正向旋转状态，将基于调色剂承载构件的电位的显影剂承载构件的电压设定为小于第一参考电压的电压， 在显影时进行设定。 非显影正向旋转状态是当不进行显影时，显影剂承载构件向前旋转的状态。

公开(公告)号：US20150293477A1

公开(公告)日：2015-10-15

申请号：US14680147

申请日：2015-04-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Sakae Saito ,  Hiroaki Sakai ,  Yukimasa Watanabe ,  Yasuhiro Oishi ,  Masashi Fujishima ,  Chikara Ishihara ,  Yasuhiro Tauchi

IPC: G03G15/08

CPC classification number: G03G15/0907 ,  G03G15/0818 ,  G03G2215/0863

Abstract: A developing device supplies a developer to a photosensitive drum, which has a cylindrical shape, and is rotatable around an axis thereof for forming an electrostatic latent image on the circumferential surface thereof. The developing device is provided with a developing roller. The developing roller is disposed to face the photosensitive drum, and has a cylindrical shape. The developing roller is rotatable around an axis thereof for carrying a developer on the circumferential surface thereof. The developing roller is provided with a small diameter portion. The small diameter portion is a part of the circumferential surface of the developing roller. The small diameter portion extends from an axial end of the developing roller axially inward by a predetermined length, and has an outer diameter smaller than an axially middle portion of the developing roller.

Abstract translation: 显影装置将显影剂供应到具有圆柱形形状的感光鼓，并且可以围绕其轴线旋转以在其圆周表面上形成静电潜像。 显影装置设有显影辊。 显影辊设置成面对感光鼓，并且具有圆柱形形状。 显影辊可绕其轴线转动，用于在其圆周表面上承载显影剂。 显影辊设置有小直径部分。 小直径部分是显影辊的圆周表面的一部分。 小直径部分从显影辊的轴向端部轴向向内延伸预定长度，并且其外径小于显影辊的轴向中间部分。

公开(公告)号：US20210302867A1

公开(公告)日：2021-09-30

申请号：US17206261

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, in order, a first direct current voltage determination mode (first DC calibration) for determining a provisional reference direct current voltage that is a provisional reference for a direct current voltage of a developing bias applied to a developing roller, 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 an image forming operation, and a second direct current voltage determination mode (second DC calibration) for determining a reference direct current voltage that is a reference for the direct current voltage of the developing bias applied to the developing roller in the image forming operation.

公开(公告)号：US11112732B1

公开(公告)日：2021-09-07

申请号：US17171357

申请日：2021-02-09

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Yasuhiro Tauchi ,  Akira Matayoshi ,  Masashi Fujishima

IPC: G03G15/09 ,  G03G15/16 ,  G03G15/08 ,  G03G15/02

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.

公开(公告)号：US11112722B1

公开(公告)日：2021-09-07

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：US11048192B1

公开(公告)日：2021-06-29

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: G03G15/08 ,  G03G15/09 ,  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 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, a control unit derives a carrier resistance based on the developing current detected by a current detecting unit, and controls an AC amplitude of an AC voltage of the developing voltage based on the carrier resistance.

公开(公告)号：US10698337B2

公开(公告)日：2020-06-30

申请号：US16424674

申请日：2019-05-29

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Akifumi Yamaguchi ,  Yasuhiro Tauchi ,  Eiji Gyotoku ,  Yu Sasaki

IPC: G03G15/06 ,  G03G15/08 ,  G03G15/00

Abstract: An image forming apparatus includes a developer information acquisition unit. The developer information acquisition unit performs a developer deterioration information acquisition operation. In the developer deterioration information acquisition operation, the developer information acquisition unit acquires a tilt of a measurement straight line representing the relationship between the change amount of the frequency in a first measurement toner image forming operation and the density change amount of the measurement toner image based on the change amount of the frequency in the first measurement toner image forming operation and a result of detecting density of the measurement toner image in a density detecting unit, and acquires a toner charging amount based on the acquired tilt of the measurement straight line and the reference information in the storage unit so as to acquire information relating to deterioration of developer based on the acquired toner charging amount.

公开(公告)号：US20190219945A1

公开(公告)日：2019-07-18

申请号：US16240896

申请日：2019-01-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu Shimizu ,  Yasuhiro Tauchi ,  Akifumi Yamaguchi

IPC: G03G15/08 ,  G03G15/09

CPC classification number: G03G15/0812 ,  G03G15/0808 ,  G03G15/09 ,  G03G15/0921

Abstract: A developing device includes a developing roller and a layer thickness regulating member. The developing roller includes a fixed magnet and a sleeve. The layer thickness regulating member includes a regulating body portion and an upstream regulating portion, and the upstream regulating portion includes an upstream magnetic member and a nonmagnetic member. Developer is hardly strongly jammed in an area between a first magnetic field concentration point of the regulating body portion and a second magnetic field concentration point of the upstream regulating portion. Thus, even if the sleeve of the developing roller is rotated at a higher speed than before, the developer is stably regulated by the layer thickness regulating member.

公开(公告)号：US10261438B2

公开(公告)日：2019-04-16

申请号：US15703949

申请日：2017-09-13

Applicant: Kyocera Document Solutions Inc.

Inventor： Yasuhiro Tauchi

IPC: G03G15/08 ,  G03G15/01

Abstract: A developing device includes a developing roller, a toner supply roller, a regulating blade, a casing, a toner-reception supporting member, a toner reception member, and a vibration generating unit. The toner-reception supporting member is opposed to the developing roller or the toner supply roller between the regulating blade and the image carrier. The toner reception member is located so as to make a downward slope toward the toner supply roller side from the image carrier side along a longitudinal direction of the toner-reception supporting member. The toner reception member has a toner receiving surface that receives the toner dropping from the developing roller. The vibration generating unit vibrates the toner reception member. The toner reception member includes a sheet-shaped toner crushing member attached to overlap approximately a whole region of the toner receiving surface in a longitudinal direction. The toner crushing member is swingably supported with respect to the toner receiving surface.