Toner fixing apparatus using heat generating resistance film
AssigneeOki Electric Industry Co., Ltd.
InventorMinoru Isobe
Life of this patent
Estimating the term…
Abstract
A resistance film which generates heat when a power is supplied is wound around a roller so that a roller may be rotated. An impression roller, which comes in contact under pressure with the resistance film, is provided and rotated synchronized with the resistance film an opposite direction. A printing form is transferred between and by the resistance film and the depression roller. In this case, toner delivered onto the printing form is fixed by supplying the power to the resistance film. The resistance film can be of an endless type or a web type.
Claims19
A fixing apparatus for fixing a toner onto a toner bearing surface of a medium, comprising:
- a first roller having opposite ends;
- electrodes on said opposite ends;
- a second roller closely opposing said first roller so as to define a nip therebetween;
- a heat generating resistance film formed in a loop;
- and
- means for transporting said film and the medium between said first roller and said second roller with said film in electrical contact with said electrodes in said nip, the medium between said second roller and said film, and the toner bearing surface of the medium facing said film, so that heat is transferred from said film to the toner in said nip, whereby the toner is fused to the toner bearing surface of the medium.
A fixing apparatus for fixing a toner onto a toner bearing surface of a medium, comprising:
- a first roller having opposite ends;
- electrodes on said opposite ends;
- a second roller closely opposing said first roller so as to define a nip therebetween;
- a heat generating resistance film;
- and
- means for transporting said film and the medium between said first roller and said second roller with said film in electrical contact with said electrodes in said nip, the medium between said second roller and said film, and the toner bearing surface of the medium facing said film, so that heat is transferred from said film to the toner in said nip, whereby the toner is fused to the toner bearing surface of the medium, wherein said transporting means includes an unwinding roller and a take-up roller connected respectively for feeding and taking up said film.
A fixing apparatus for fixing a toner onto a toner bearing surface of a medium, comprising:
- an electrode roller, having a plurality of axially aligned successively adjacent segments, the segments forming respective first electrodes and being insulated from each other;
- a pressure roller closely opposing said electrode roller so as to define a nip therebetween;
- a heat generating high resistance film movably disposed between said electrode roller and said pressure roller and having a first surface contacting each of said first electrodes;
- a heat conducting low resistance film, movably disposed between said pressure roller and said high resistance film, and contacting said high resistance film at least in said nip;
- at least one second electrode electrically contacting said low resistance film adjacent to said nip;
- and
- means for transporting said high and low resistance films and the medium between said electrode roller and said pressure roller, with the medium between said pressure roller and said low resistance film and the toner bearing surface of the medium in contact with said low resistance film in said nip, whereby heat generated in said high resistance film in said nip is conducted through said low resistance film to the toner bearing surface of the medium, thereby to fuse the toner to the toner bearing surface of the medium.
A fixing apparatus for fixing a toner onto a toner bearing surface of a medium, comprising:
- a resistance roller having a peripheral surface;
- a heat conductive low resistance film coating the peripheral surface of said resistance roller;
- a heat generating high resistance film coating said low resistance film;
- a pressure roller closely opposing said resistance roller so as to define a nip therebetween for receiving the medium with the toner bearing surface facing said high resistance film;
- and
- means for applying electrical current to the high resistance film to generate heat in said nip, including
- a plurality of first electrodes insulated from each other and electrically contacting said high resistance film, and
- a second electrode electrically contacting said low resistance film.
Dependencies are inferred from the claim text.