Canon Kabushiki Kaisha

Yoshihiro Mitsui

Hideki Maeshima

Shuichi Gofuku

Kuniaki Hirukawa

Kodai Hayashi

Hisashi Taniguchi

Shuhei Kawasaki

Yasukazu Ikami

Takuya Oka

Shunsuke Matsushita

Kosuke Ikada

Go Shindo

Shinichi Agata

Kentaro Yamawaki

Yuichiro Hirata

Shinichi Hagiwara

Nobuyoshi Yoshida

Naoki Fukushima

Bunro Noguchi

Yusuke Jota

Akinobu Saito

Masamichi Sato

Toshiaki Takeuchi

Jun Miura

Yuhei Terui

Shinya Yamamoto

Go Araki

Tomonori Matsunaga

Katsuyuki Nonaka

Takayoshi Kihara

Masahito Kato

Noriyoshi Umeda

Shohei Kototani

Hisashi Yamauchi

Kazunori Hashimoto

Keitaro Nakata

Katsuhiro Kojima

Shuichi Gofuki

A process cartridge includes a photosensitive drum, a rotatable developing roller, a rotatable toner supplying roller provided in contact with the developing roller, and a rotatable feeding member provided in a toner chamber and configured to feed the toner from the toner chamber. A coupling is operatively connected to the developing roller, the toner supplying roller, and the feeding member, with the coupling being configured to receive a driving force for rotating the feeding member, the developing roller, and the toner supplying roller. A plurality of gears are operatively connected to the developing roller, the toner supplying roller, and the feeding member, with each gear of the plurality of gears being configured to transmit the driving force received by the coupling to at least one of the feeding member, the developing roller, and the toner supplying roller.

Process cartridge and image forming apparatus

A process cartridge includes a photosensitive drum and a developing roller configured to develop an electrostatic latent image formed on the photosensitive drum. The process cartridge further includes a developer supplying roller configured to supply the developer to the developing roller and a developer feeding member configured to feed the developer toward the developer supplying roller. A first gear is configured to transmit a driving force transmitted, through the developer supplying roller, from a driving force receiving member, and a second gear is configured to transmit the driving force to the developer feeding member. An idle gear is configured to transmit the driving force transmitted from the first gear to the second gear.

A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.

[TASK] An object of the present invention is to provide an image developing apparatus and a process cartridge with which an image quality can be improved while reducing a number of parts and reducing an amount of remaining developer. [SOLUTION] A process cartridge detachably mountable to an electrophotographic image forming operators includes a developing chamber including a developing roller and a developer supplying roller; a developer accommodating container accommodating the developer provided below the developing chamber with respect to gravity direction, wherein the developer is fed into the developing chamber while being stirred by a feeding member. The developer supplying roller rotates such that a surface thereof moves in the same direction as a surface of the developing roller at a position where the developer supplying roller contacts the developing roller. A surface speed of the developer supplying roller is higher than a surface speed of the developing roller. The developer supplying roller is rotationally driven by receiving a driving force at a position upstream of the developing roller.

An image forming apparatus includes a detection member configured to detect a conveyance state of a recording medium, a control unit configured to sequentially execute a first operation for continuously executing a rotation operation of an image bearing member and an intermediate transfer member without stopping them when the detection member detects a failure, and a second operation for stopping the rotation operation of the image bearing member when the surface of the image bearing member is moved by a predetermined distance through the rotation operation of the image bearing member after the failure is detected.

Image forming apparatus

An image forming apparatus that executes an image forming operation for forming a toner image on a recording material and an application operation of applying a metal soap to a surface of an image bearing member by supplying a toner stored in a toner storing unit to the surface of the image bearing member from the developing member. A surficial moving speed of the image bearing member during the application operation is lower than the surficial moving speed of the image bearing member during the image forming operation, and a speed difference between the surficial moving speed of the developing member and the surficial moving speed of the image bearing member during the application operation is larger than that during the image forming operation.

Image forming apparatus that suppresses occurrence of image smearing by maintaining a metal soap on a surface of a photoconductor

Provided are an image bearing member, a developer bearing member, and a cleaning member. A fixation layer, including at least one of an organosilicon polymer and inorganic particles, is provided on a surface of the developer borne on the developer bearing member, and a fixation percentage of the fixation layer is 85% or greater. The image bearing member and the developer bearing member are rotationally driven such that, a surface of the image bearing member and a surface of the developer bearing member move in opposite directions from each other at a contact portion where the image bearing member and the developer bearing member are in contact with each other.

Process cartridge providing fixation layer to developer on image bearing member and image forming apparatus

A process cartridge includes a seal member contacting an image bearing member upstream in the rotation direction of the image bearing member from a cleaning member and allowing the developer to move from upstream in the rotation direction from the contact part between the seal member and the image bearing to downstream from the contact part while regulating movement from downstream to upstream from the contact part. The developer has surface protrusions containing an organic silicon polymer, wherein either (i) the work function of the seal member is greater than the work function of the developer when the developer has a negative charging polarity and is smaller than the work function of the developer when the developer has a positive charging polarity, or (ii) the absolute value of the difference between the work function of the seal member and the work function of the developer is within a predetermined range.

Process cartridge, image forming apparatus and cleaning apparatus

A charging memberthat charges an image bearing memberhas an electrically conductive support and an elastic layer in contact with the image bearing member. The elastic layer includes a semi-conductive rubber composition having a matrix-domain structure including a matrix and domains having electric conductivity. The matrix has a higher volume resistivity than the domain. The developer includes a toner having toner particles. The toner particles each have a surface layer including an organosilicon polymer. The organosilicon polymer has a structure represented by R&#x2014;SiO(R is a hydrocarbon group having at least 1 and not more than 6 carbon atoms). The adhesion ratio of the organosilicon polymer on the surface of the toner particle is 90% or more.

An image forming apparatus includes a storage unit configured to store correction data; an identifying unit configured to identify a correction amount for a correction target pixel based on the correction data stored in the storage unit; a correction unit configured to correct an exposure amount of the correction target pixel among a plurality of pixels indicated by image data, from an exposure amount indicated by the image data, based on the correction amount for the correction target pixel; and an image forming unit configured to form an image based on an exposure amount after correction by the correction unit. The correction data includes only a correction amount corresponding to each of representative parameter values of a plurality of parameter values of a parameter for varying the correction amount.

Image forming apparatus, cartridge, image forming system, and storage medium for correcting exposure amounts

An image forming apparatus in which when toner remaining on a development roller in an area from a developer nip to a regulating blade disposed upstream of a rotation direction of the development roller during a stoppage of the image forming apparatus passes through the developer nip, a bias is applied so that the toner is drawn to the development roller, and a relative speed difference between the photosensitive drum and the development roller is created so as to be larger than the that during an image forming operation.

Image forming apparatus to perform an activation control using a developing bias applying member and a speed control unit

A process cartridge includes a developing device that supplies developer to a photosensitive member and an elastic portion that cleans a peripheral surface of the photosensitive member. Multiple grooves are formed side by side in a generatrix direction on the peripheral surface. The developer contains a toner including a toner particle and an organosilicon polymer having a structure represented by R&#x2014;SiOcovering the toner particle surface, where R represents a hydrocarbon group having at least 1 and not more than 6 carbon atoms. When a penetration amount of the elastic portion with respect to the photosensitive member is set as &#x3b4; (mm), and a fixing rate of the organosilicon polymer on the surface of the toner particle is set as &#x3b1; (%), &#x3b4;&#x2264;0.02&#xd7;&#x3b1;&#x2212;0.4 is satisfied.

Process cartridge including photosensitive member having multiple grooves and image forming apparatus including the process cartridge

A developer borne on a developer bearing member includes a toner, the toner has a Martens hardness of at least 200 MPa and not more than 1100 MPa when measured under a condition of a maximum load of 2.0&#xd7;10N, and where a contact pressure of a regulating member that regulates the developer borne on the developer bearing member against the surface of the developer bearing member is denoted by N (gf/mm) and a contact pressure of a supplying member that supplies the developer to the developer bearing member against the surface of the developer bearing member is denoted by D (gf/mm), the following expressions are satisfied: D+2&#xd7;N&#x2212;6&#x2265;0, 1.5&#x2264;N&#x2264;4.5, and 2.0&#x2264;D&#x2264;4.5.

Growing community of inventors

Numazu, Japan

Yoshihiro Mitsui