Canon Kabushiki Kaisha

Yoshikuni Ito

Takayuki Tanaka

Satoshi Tsuruya

Yasuhiro Horiguchi

Takeshi Fujino

Kenji Karashima

Toshinori Nakayama

Shinichi Nishida

Kazunari Hagiwara

Osamu Iwasaki

Shinji Katagiri

Yuji Kawaguchi

Masahiro Inoue

Haruhiko Omata

Takahiro Kawamoto

Yasuharu Chiyoda

Motohide Shiozawa

Masaru Ohno

Yoichi Kimura

Satoshi Takami

Hitoshi Yoshino

Ichiro Okumura

Shigeaki Takada

Shinichiro Hosoi

Youichi Chikugo

Daigo Matsuura

Tatsuaki Orihara

Junichi Moteki

Ikuo Nakamoto

Kazuhiro Hasegawa

Makoto Fukatsu

Yuji Bessho

Seiji Hara

Shuhei Tokiwa

Yoshihiro Shigemura

Yasuhiro Hayashi

Seiichiro Kameda

Ryuta Ai

Nobuaki Hara

Naoki Fuei

Makoto Jinzai

Keigo Kaji

Isao Kumada

Yasuyuki Matsumoto

Ryuta Al

Hiroshi Komiyama

An image forming apparatus sequentially transfers toner images formed on a plurality of photosensitive drums onto an intermediate transfer member or a transfer material to form an image. The image forming apparatus includes an intermediate transfer belt provided with electrical conductivity, and a power supply for applying a voltage to a secondary transfer roller to pass a current from the secondary transfer roller to the plurality of photosensitive drums via the intermediate transfer belt, thus primarily transferring the toner images from the plurality of photosensitive drums onto the intermediate transfer belt.

Image forming apparatus having a power supply common to primary transfer and secondary transfer

The present invention relates to an image forming apparatus that forms an image by consecutively superposing toner images that have been formed on a plurality of photosensitive drums, on an intermediate transfer member or a transfer medium. The image forming apparatus is made compact and operates at a low cost. Since a current supply member supplies a current in a rotational direction of an intermediate transfer belt, multiple first transfer portions do not need corresponding voltage sources. Even in the case where a charging member supplies a current, the potential of the intermediate transfer belt is maintained at a predetermined potential by a constant-voltage element connected to support rollers.

Image forming apparatus

A developing roller that is capable of carrying toner on a surface thereof, and that supplies the toner carried on the surface to a surface of a photosensitive drum when a voltage is applied thereto, includes: a rubber layer; and a surface layer that covers the rubber layer, contains alumina, and has a higher volume resistivity than the rubber layer.

Developer carrying member, developing assembly, process cartridge, and image forming apparatus

It has been difficult to ensure satisfactory secondary transfer performance while ensuring satisfactory primary transfer performance by passing a current in the circumferential direction of an intermediate transfer belt from a current supply member. To satisfy a relationship of Rv&#x3e;Rs, where Rv is resistance in the thickness direction of an intermediate transfer belt and Rs is resistance in the circumferential direction of the intermediate transfer belt over the distance between an image carrier located most upstream and an image carrier located most downstream in the movement direction of the intermediate transfer belt.

An image forming apparatus sequentially transfers toner images formed on a plurality of photosensitive drums onto an intermediate transfer member or a transfer material to form an image. The image forming apparatus includes an intermediate transfer belt provided with electrical conductivity, and a power supply for applying a voltage to a current supply member contacting the outer circumferential surface of the intermediate transfer belt to pass a current from the current supply member to the plurality of photosensitive drums via the intermediate transfer belt, thus primarily transferring the toner images from the plurality of photosensitive drums onto the intermediate transfer belt.

Image forming apparatus configured to perform a primary transfer of a toner image from a plurality of image bearing members to an intermediate transfer belt by following a current in circumferential direction with respect to the intermediate transfer belt

An image forming apparatus sequentially transfers toner images formed on a plurality of photosensitive drums onto an intermediate transfer member or a transfer material to form an image. The image forming apparatus includes an intermediate transfer belt provided with electrical conductivity, and a power supply for applying a voltage to a current supply member contacting the intermediate transfer belt to pass a current from the current supply member to the plurality of photosensitive drums via the intermediate transfer belt, thus generating electric discharge on the upstream side of each of primary transfer sections.

An image forming apparatus includes a first index forming unit that forms a plurality of first electrostatic latent image indexes at positions adjacent to a toner image to be formed on a recording material in a width direction of a first image bearing member and a second index forming unit forms a plurality of second electrostatic latent image indexes at positions adjacent to a toner image to be formed on the recording material in a width direction of a second image bearing member. A control unit controls operation of at least a second image forming unit so as to maintain a set positional relationship between the first electrostatic latent image indexes transferred to an intermediate transfer member and the second electrostatic latent image indexes based on detection results by first and second detection units.

Image forming apparatus having a plurality of latent image indexes

An image forming apparatus includes a rotatable heater for heating a toner image on a recording material in a nip; a rotatable pressor for pressing against the heater to form the nip; a moving mechanism for spacing the heater and the pressor from each other; a detector for detecting a temperature of the pressor; a cooler for cooling the pressor; a changer for changing the rotational speed of the pressor; and an executor for executing, when the temperature of the pressor reaches an upper limit temperature during execution of an image formation job of continuously forming the images, a cooling mode for cooling the pressor by the cooler in a state that the pressor and the heater are spaced from each other while rotating the pressing member at a second rotational speed higher than a first rotational speed which is a speed during the execution of the job.

Image forming apparatus for cooling a pressing member pressing against an image heating member and forming a nip therebetween

An image forming apparatus capable of executing a mode for decelerating a rotation speed of a fixing member and a pressure member between sheets in a continuous print than that during a fixing operation.

An image heating apparatus includes a heating rotatable member for heating an image on a recording material in a nip, a nip forming member for cooperating with the heating rotatable member to form the nip, and a rubbing rotatable member. The rubbing rotatable member rubs, by its rotation, the heating rotatable member. The rubbing rotatable member has an elastic layer to provide a microhardness [GPa] of not less than 0.03 and not more than 1.0.

Image heating apparatus including heating rotatable member and cooperating rubbing rotatable member

An image heating apparatus includes a heating rotatable member for heating an image on a recording material in a nip; a nip forming member for cooperating with said heating rotatable member to form the nip; a rubbing rotatable member having a rubbing material for rubbing said heating rotatable member; the following is satisfied:7&#xd7;10&#x2266;(tan &#x3b8;) (|)&#x2266;68&#xd7;10 where P: load [N] by said rubbing member to said heating rotatable member, V: peripheral speed of said heating rotatable member [mm/sec], v: peripheral speed [mm/sec] the of said rubbing member, h: microhardness [GPa] of said heating rotatable member, and &#x3b8;: a half-apex-angle [&#xb0;] of said rubbing material.

Image heating apparatus

Growing community of inventors

Tokyo, Japan

Yoshikuni Ito