Canon Kabushiki Kaisha

Shohei Ishio

Keisuke Ishizumi

Shinji Katagiri

Takayuki Tanaka

Shuichi Tetsuno

Tsuguhiro Yoshida

Wataru Takahashi

Shingo Ito

Toshihiko Takayama

Seiji Saito

Tomonori Matsunaga

Masaru Ohno

Koji An

Hiroko Yokoyama

Noriaki Egawa

Eiichi Hamana

Kenichi Iida

Yuichiro Inaba

Ryo Matsumura

Norihiro Matsumoto

Keisuke Samejima

Hiroomi Kojima

Keizo Kojima

An image forming apparatus includes a rotatable image bearing member and a rotatable developing member to carry developer made up of toner particles and carrier particles adhered to surfaces of the toner particles. Where a pressing force pressing the developing member against the image bearing member is F1, a total number of the carrier particles interposed between the toner particles and the image bearing member is N1, and an adhesion Ft between a carrier particle and a toner particle, measured when the carrier particle is pressed against the toner particle with F1/N1 that is a pressing force per unit carrier particle, and an adhesion Fdr1 between the carrier particle and the image bearing member, measured when the carrier particle is pressed against the image bearing member with F1/N1, satisfy Ft≤Fdr1.

Image forming apparatus

An image forming apparatus includes an image bearing member, an intermediate transfer member, a reinforcing member, and a collection unit having a contact member and a support member. The contact member extends in a longitudinal direction that is orthogonal to an intermediate transfer member movement direction. One end of the contact member is fixed to the support member and the other end is in contact with the intermediate transfer member as a free end. When a maximum region in the longitudinal direction where an image is formable on a transfer medium having a maximum size that is supported by the image forming apparatus is defined as an image forming region, at least part of the reinforcing member is located outside the image forming region and, on one end side of the contact member, the reinforcing member is provided on an inner side than the end of the contact member.

Image forming apparatus for maintaining cleaning performance while preventing turn-over of a contact member

An image bearing member includes an agitation member and a sheet member. A sheet portion of an agitation member comes into contact with a second side surface of the blade member. When viewed from a rotation axis direction of a shaft portion of the agitation member, an imaginary line A connects a position of an end portion on a most upstream side of the second side surface in the rotation direction and an axial center position of the shaft portion, and an imaginary line B is orthogonal to the imaginary line A and passes through the position of the end portion on the most upstream side of the second side surface, and the free end of the sheet member is disposed at a position closer to the blade member than a position where a second line intersects with an outer circumferential surface of the image bearing member.

Image forming apparatus to reduce or suppress leakage of toner

An image forming apparatus is used, including a rotary member, on which a developer image by a developer is formed, a collection unit for collecting the developer by a blade member from a surface of the rotary member, and a control unit for controlling an image forming operation on the surface of the rotary member and a supply operation for supplying the developer to a contact portion between the rotary member and the blade member, wherein, assuming that the supply operation for supplying the developer to inside of a printable area is a first supply operation and the supply operation for supplying the developer to outside the printable area is a second supply operation, the control unit controls such that the first supply operation and the second supply operation are performed at different timing.

An image forming apparatus includes a rotatable image bearing member and a rotatable developing member to carry developer made up of toner particles and carrier particles adhered to surfaces of the toner particles. Where a pressing force pressing the developing member against the image bearing member is F, a total number of the carrier particles interposed between the toner particles and the image bearing member is N, and an adhesion Ft between a carrier particle and a toner particle, measured when the carrier particle is pressed against the toner particle with F/Nthat is a pressing force per unit carrier particle, and an adhesion Fdrbetween the carrier particle and the image bearing member, measured when the carrier particle is pressed against the image bearing member with F/N, satisfy Ft≤Fdr

An image forming apparatus includes an endless belt including a base layer and an electroconductive layer positioned on an inner peripheral surface side of base layer and forming an inner peripheral surface of the belt, and a roller provided on the inner peripheral surface side of the belt and including a roller portion around which the belt is wound and which is formed of a metal material. The electroconductive layer contains a binder resin, an electroconductive agent, and a copper compound, and has surface resistivity of 5.0&#xd7;10&#x3a9;/&#x25a1; or less. The roller portion includes a base material of a first metal material comprising a first metal, and a coating layer which forms a surface contacting the electroconductive layer formed of a second metal material comprising a second metal. A difference in standard potential between the second metal and copper is smaller than that between the first metal and copper.

Image forming apparatus which includes a belt having an electroconductive layer

An intermediate transfer belt has a first region and a second region in an outer circumferential surface thereof that is in contact with a blade. The first region has a first dynamic friction coefficient in a belt conveyance direction, and the second region has a second dynamic friction coefficient. The distance of the second region in the belt conveyance direction is less than the distance of the first region and is greater than the distance of a contact portion in which the blade is in contact with the intermediate transfer belt.

An image forming apparatus includes an endless belt including a base layer and an electroconductive layer positioned on an inner peripheral surface side of the belt than the base layer and forming an inner peripheral surface of the belt, and a roller provided on the inner peripheral surface side of the belt and including a roller portion around which the belt is wound and which is formed of an aluminum material. The electroconductive layer contains a binder resin, an electroconductive agent, and a copper compound, and has surface resistivity of 5.0&#xd7;10&#x3a9;Q/&#x25a1; or less. The roller includes an alumite layer forming a surface contacting the electroconductive layer.

Toner contains toner base particles and an organosilicon polymer on the surface of the toner base particles. After a toner image is transferred from an intermediate transfer belt to a transfer material, residual toner on the intermediate transfer belt is collected into a belt cleaning device by a blade. A CPU executes supply control of supplying toner from a developing device toward the blade via a photosensitive drum and via the intermediate transfer belt on the basis of a counter accumulated value that correlates with an amount of organosilicon polymer adhering to the blade.

Image-forming apparatus which controls the rotation of the intermediate transfer belt based on accumulated toner

A detection unit executes correction control of an image formation condition on a basis of a detection result of reflected light when infrared light is radiated to a test patch, which is transferred from a photosensitive drum to an intermediate transfer belt, and the intermediate transfer belt, wherein the intermediate transfer belt has a base layer which is thickest among a plurality of layers forming the intermediate transfer belt in a thickness direction of the intermediate transfer belt and to which an ion conductive agent is added, and an inner surface layer which has a light transmittance lower than that of the base layer.

A surface roughness Rz of an outer peripheral surface of an intermediate transfer belt is 0.05 &#x3bc;m or more, and toner contains toner base particles and an organosilicon polymer on the surface of the toner base particles. After residual toner on the intermediate transfer belt is collected by a blade into a belt cleaning device, the blade has a coating layer on its surface facing the intermediate transfer belt, the coating layer containing the organosilicon polymer.

Image-forming apparatus with a durable contact member that abuts against a belt

A cleaning device includes a conveyance member, an agitation member, and an accommodation unit. The conveyance member extends in a width direction of an image bearing member orthogonal to a moving direction of the image bearing member, and conveys toner in the width direction by rotation. The accommodation unit includes a wall portion located inside a rotation orbit of an outermost peripheral portion of the agitation member, downstream of the collection member and upstream of the conveyance member in a rotation direction of the agitation member when viewed in a rotation axis direction of the conveyance member.

Cleaning device and image forming apparatus

Toner contains toner base particles and an organosilicon polymer on the surface of the toner base particles, and silica particles are added to the toner as an external additive. The surface roughness Rz of an intermediate transfer belt, against which a blade abuts, in the width direction of the intermediate transfer belt perpendicular to the belt conveying direction is larger than the average particle diameter Ry of the organosilicon polymer and is smaller than the average particle diameter Rk of the silica particles.

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Tokyo, Japan

Shohei Ishio