Canon Kabushiki Kaisha

Bunro Noguchi

Hisashi Taniguchi

Hisashi Yamauchi

Atsushi Toda

Shunsuke Matsushita

Yoshihiro Mitsui

Takayoshi Kihara

Jun Suzuki

Go Shindo

Yusaku Iwasawa

Taku Watanabe

Keitaro Nakata

Takahito Ueno

Masahiro Shibata

Toshiaki Takeuchi

Masaki Seto

Tomoaki Nakai

Shinichi Tsukida

Yuichiro Hirata

Kodai Hayashi

Masahito Kato

Takeshi Kawamura

Shinichi Agata

Shogo Satomura

Kazunori Hashimoto

Yasuharu Hirado

An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein the diameter of the transfer roller is greater than the diameter of the development roller and the diameter of the cleaning roller is greater than the diameter of the development roller.

Image forming apparatus

An image forming apparatus comprising: an image bearing member, a developing member that forms a toner image with a toner including a metal soap having a polarity opposite to that of the toner, a supply member that supplies the toner to the developing member, and a control unit that executes a metal soap supply operation of supplying the metal soap from the developing member to the image bearing member when an operation other than the image forming operation is executed, wherein the metal soap supply operation includes a first mode and a second mode, and a potential difference between the supply member and the developing member, which causes an electrostatic force in the direction from the supply member to the developing member to act on the metal soap, is smaller in the metal soap supply operation in the second mode than in the first mode.

Image forming apparatus with developing member that supplies toner to surface of image bearing member to form toner image

An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.

Image forming apparatus having developer transporting member that transports developer toward a developer bearing member

An image forming apparatus includes first and second image forming portions and a belt. The first and second image forming portions include first and second image bearing members, and first and second transferring members, respectively. The belt nips and feeds a recording material. The first image forming portion is disposed upstream of the second image forming portion in a moving direction of the recording material, and a plurality of members including the first and second image bearing members are integrally assembled and are mountable on or dismountable from a main assembly of the image forming apparatus. A film thickness of a surface of the first image bearing member is larger than a film thickness of a surface of the second image bearing member, circumferential speed ratios or contact pressures of rotating components differ, and/or mass ratios of components of respective developers differ.

Image forming apparatus for prolonging life of replaceable image forming unit

An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein a diameter of the transfer roller is greater than a diameter of the development roller and the diameter of the transfer roller is greater than a diameter of the cleaning roller.

Image forming apparatus capable of suppressing image defects caused by paper dust

An image forming apparatus includes a photosensitive member, a charging member for charging the photosensitive member, a cleaning member that comes into contact with the charging member and moves relative to the charging member to clean the charging member, an opening/closing member for exposing an inside of the apparatus, and a driving mechanism that moves the charging member and the cleaning member relative to each other in association with opening/closing of the opening/closing member.

Image forming apparatus and cartridge

An image forming apparatus including a holding apparatus configured to collect residual developer remaining on an intermediate transfer belt and temporarily hold the residual developer, and a cleaning member configured to remove toner borne on the photosensitive drum that moves the toner held by the holding apparatus to the intermediate transfer belt and discharging the toner. Toner from a development roller is supplied to the cleaning member before toner reversely transferred from the intermediate transfer belt is supplied to the cleaning member.

Image forming apparatus for an intermediate transfer of a toner image and for reversely transferring collected developer to an image bearing member

Provided are a drive force transmission member and control unit. The drive force transmission member has multiple first engaging portions. Drive force is transmitted from the drive force transmission member to a drive force receiving member with each first engaging portion engaged with a second engaging portion of the drive force receiving member. The second engaging portions are movable in a radial direction centered on a rotation axis line of the drive force transmission member. The control unit performs rotation control of forward rotation of the drive force transmission member by &#x3b1;&#xb0; and thereafter backward rotation by &#x3b2;&#xb0; after a cartridge is mounted to an apparatus main body but before image formation. Each of the multiple first engaging portions is upstream in the forward rotation direction of the drive force transmission member from the second engaging portion out of the multiple second engaging portions with which engaging will be realized.

The image forming apparatus includes a control unit that executes a supply operation to supply a toner charged with a regular charge polarity, to at least one abutting portion of a plurality of abutting portions, at the time of image non-formation, the plurality of abutting portions being formed by a plurality of cleaning members and a plurality of image bearing members, the control unit determining an image bearing member to which the most amount of the toner charged with the regular charge polarity is supplied, based on image formation information, the image formation information being information about an image formation executed before the supply operation is executed.

A developer container includes a stirring member that stirs a developer and a conductive resin sheet that comes into contact with the stirring member when the stirring member rotates. Wherein, the developer container detects developer quantity using capacitance from the conductive resin sheet.

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Mishima, Japan

Bunro Noguchi