Canon Kabushiki Kaisha

Hideki Ohta

Takayuki Mizuta

Jiro Moriya

Seiji Obata

Terutaka Endo

Takashi Kuwata

Youhei Suzuki

Takamichi Matsuo

Kenji Abe

Kazushi Suzuki

Yoshisuke Kasuya

Yusuke Nakashima

Atsuhiko Yamaguchi

Takuro Mita

Toshiaki Sako

Hiroshi Kataoka

Eiji Uekawa

Keisuke Mochizuki

Naoto Tsuchihashi

Junichiro Nakabayashi

Takayuki Hata

The present invention provides a fixing device including a flexible cylindrical rotary member and an inner-surface opposing portion that opposes an inner surface of the rotary member at an end portion of the rotary member in a generatrix direction. The inner-surface opposing portion moves upstream in a recording material conveying direction in accordance with lateral shift of the rotary member in the generatrix direction. This restricts the lateral shift of the rotary member.

Fixing device for suppressing reduced durability of a flexible rotary member

An image forming apparatus includes a heating rotary member and a pressing rotary member. The pressing rotary member and the heating rotary member form a fixing nip portion and are configured to apply heat and pressure to a toner image carried on a recording medium at the fixing nip portion, thereby fix the toner image onto the recording medium. The image forming apparatus further includes a winding roller configured to wind up a web used to collect toner that is not fixed to the recording medium, a motor configured to rotate the winding roller, a contact member configured to contact an outside surface of the web wound around the winding roller, a variable resistor disposed so as to be able to change a resistance in accordance with a position of the contact member, and a control unit configured to control an amount of rotation of the motor.

Abnormality detection of web unit in image forming apparatus

An image forming apparatus includes a heating rotary member that heats toner born on a recording material, and a pressure rotary member that pressurizes the heating rotary member. These rotary members form a fixing nip portion and fix a toner image to the recording material at the fixing nip portion while nipping and conveying the recording material. The apparatus further includes a web that collects toner adhering to a surface of the heating rotary member, a winding roller that winds the web, a motor that rotates the winding roller, a contact member that makes contact with an outer surface of the wound web and moves based on a position of the outer surface, a variable resistor that is connected to change a resistance value depending on a position of the contact member, and a control unit that controls a rotation amount of the motor based on the resistance value.

Image forming apparatus having a web to collect toner from a heating rotary member

An image forming apparatus includes an image forming portion for forming a toner image on a sheet, a fixing portion for fixing the toner image formed by the image forming portion on the sheet, a reversing portion for reversing the sheet carrying the toner image fixed by the fixing portion, a blower for blowing air, and a duct for guiding the air blown from the blower to the reversing portion. The duct is provided with an opening at an end in a width direction of the sheet, and the blower blows the air from a downstream side to an upstream side with respect to the feeding direction of the sheet after being reversed by the reversing portion.

Image forming apparatus

An image forming apparatus in which at least part of an image scanner is disposed in an area below an original discharge unit and above an image forming unit.

A fixing device includes a cylindrical film, a back-up member in contact with an inner surface of the film, a roller configured to form a fixing nip portion with the back-up member via the film, and a metal bearing configured to rotatably hold a shaft of the roller. The fixing device further includes an insulating portion provided between an end surface of the film and the bearing, thereby suppressing occurrence of leakage between the bearing and the end surface of the film.

Fixing device

A fixing device includes first and second members, a frame supporting the second member, and two pressure mechanisms provided on either end of the first member. The mechanism includes a lever having one end supported by the frame in a rotatable manner in a pressure direction, and a helical compression spring disposed between a first spring support provided on the other end of the lever and a second spring support on the frame. At least one of the first and second spring supports includes a first area and a second area closer to the spring in the axial direction than the first area, the first area is in contact with an area of the spring close to a winding end of the spring, and the second area is in contact with an area of the spring farther away from the winding end in a winding direction than the first area.

An image fixing apparatus includes: a heater for heating and fixing a toner image formed on a recording material; a thermosensitive element for sensing heat from the heater; and a tension spring for urging the thermosensitive element toward the heater.

Image fixing apparatus having a heater, a thermosensitive element, and a tension spring configured to bias or urge the thermosensitive element

An image forming apparatus includes a sheet feed unit which feeds a sheet to an image forming unit forming an image on the sheet, a re-transport roller which reverses the sheet with a toner image fixed on the sheet and re-transports the sheet to the image forming unit, and a control unit which controls a sheet feed operation of the sheet feed unit for feeding the sheet. As the temperature of the re-transport roller sensed by the temperature sensing unit is decreased, the control unit retards the timing at which the sheet feed unit starts the sheet feed operation when a duplex image formation in which the image is formed on both sides of the sheet is performed after a one-side image formation is completed.

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Numazu, Japan

Hideki Ohta