Canon Kabushiki Kaisha

Masahiro Nawa

Naoyuki Yamamoto

Koji Takematsu

Yasuo Nami

Kazuaki Aoki

Shouhei Takeda

Keisuke Mogi

An image forming apparatus includes (i) a feeding portion; (ii) an image forming portion; and (iii) a fixing portion. The fixing portion includes: (iii-i) a rotatable member; (iii-ii) an exciting coil configured to cause the rotatable member to generate heat by electromagnetic induction heating; (iii-iii) a magnetic flux suppressing member configured to suppress a part of magnetic flux acting from the exciting coil to the rotatable member; and (iii-iv) a motor for moving the magnetic flux suppressing member depending on a width size of the sheet; and (iv) a controller configured to variably control a feeding interval of the sheet by the feeding portion so that a number of times of movement per unit time of the magnetic flux suppressing member is not more than a predetermined value when image formation of a plurality of sheets different in width size is continuously effected.

Image forming apparatus with fixing portion having exciting coil configured to cause rotatable member to generate heat by electromagnetic induction heating

An image heating apparatus includes: a rotatable heating member for heating a toner image formed on a recording material by using a toner containing a parting agent; an exciting coil for causing the rotatable heating member to generate heat by electromagnetic induction heating; a magnetic flux suppressing member for suppressing a part of magnetic flux acting from the exciting coil onto the rotatable heating member; a moving mechanism for moving the magnetic flux suppressing member depending on a width size of the recording material; a motor for operating the moving mechanism; and an executing portion capable of selectively executing an operation in a first mode in which a first current is supplied to the motor and an operation in a second mode in which a second current larger than the first current is supplied to the motor.

Image heating apparatus

An image heating apparatus includes a hollow image heating roller having a through hole at one axial end portion side thereof; a bearing fitted around the roller; a heat insulating bush fitted around the roller between the roller and the bearing; a retaining ring for preventing the heat insulating bush from moving relative to the roller; an annular spacer provided between the heat insulating bush and the retaining ring, the annular spacer being provided with an inwardly protruded key portion engageable with the through hole.

Image heating apparatus and recording material feeding apparatus

An image heater a hollow heating roller having a hole at an axial end portion thereof; a bearing supporting the heating roller; a heat insulating bush fitted between an outer surface of the heating roller and the bearing; a retaining ring for retaining the heat insulating bush in an axial direction of the heating roller, the retaining ring including a projection engaging with the hole; an annular spacer provided between the retaining ring and the heat insulating bush, wherein the spacer includes a connecting portion having a connecting hole, the retaining ring includes a hooking portion engaging with the connecting hole.

An image heating apparatus includes a roller, a heating portion disposed within the roller, a bearing portion fitted around an end portion of the roller to rotably support the roller, and a retaining ring attached at an axially predetermined position of the roller to restrict the roller from moving in a axial direction of the roller with respect to the bearing portion. The retaining ring includes first and second projections fitted into a hole portion of the roller. Profiles of side surfaces of these first and second projections abutting edges of the hole portion in a circumferential direction are recessed in the circumferential direction.

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Kumamoto, Japan

Masahiro Nawa