Canon Kabushiki Kaisha

Kengo Koyama

Yasuharu Toratani

Shigeru Tanaka

Shigeaki Takada

Daigo Matsuura

Masayuki Tamaki

Yasuharu Chiyoda

Akiyoshi Shinagawa

Masanobu Tanaka

Toru Katsumi

Suguru Takeuchi

Ayano Ogata

Masahiro Tsujibayashi

Nobuaki Hara

Ayano Saito

Shuhei Yasuda

A fixing device includes an endless belt configured to heat a recording material, a pressure member contacting an outer circumferential surface of the endless belt to form a nip portion, and a pad. A length of the endless belt is larger than a length of the pad in a width direction of the endless belt. The pad includes a first surface forming the nip portion, a second surface facing the first surface, and a third surface connecting the first surface and the second surface in the width direction and formed in a conveyance direction of the recording material. And the third surface has a curved shape in a cross section orthogonal to the conveyance direction of the recording material.

Fixing device and image forming apparatus with nip portion that prevents belt cracking and oil leakage

An image heating apparatus includes a first rotary member, a second rotary member a retaining portion, and a regulating portion. An end portion of the first rotary member abuts against the regulating portion and the regulating portion regulates movement of the first rotary member to the sheet width direction. The regulating portion comprises a curved surface shape having a radius of curvature of 10 mm or greater and 500 mm or smaller and protruding toward the first rotary member. An apex portion of the curved surface shape is, when viewed in the sheet width direction, positioned in an area outside of the retaining portion and on a side of the first rotary member from a tangent of the first rotary member at the nip portion. The apex portion is positioned in an area upstream in the sheet conveyance direction of a straight line that is orthogonal to the tangent.

Image heating apparatus having a belt and a regulating portion to regulate movement of the belt in a sheet width direction

An image forming apparatus includes a rotary member, a web, a moving unit, a detecting unit configured to detect a predetermined position, and a control portion. The control portion informs, in a case where an actual moving amount per one winding operation is a first moving amount, the replacement of the web, if a number of sheets of recording materials on which images have been formed after the predetermined position is detected reaches a first number of sheets. The control portion informs, in a case where the actual moving amount per one winding operation is a second moving amount which is greater than the first moving amount, the replacement of the web, if a number of sheets of recording materials on which images have been formed after the predetermined position is detected reaches a second number of sheets which is less than the first number of sheets.

Image forming apparatus

Growing community of inventors

Nagareyama, Japan

Kengo Koyama