JP2001092284A5

JP2001092284A5 -

Info

Publication number: JP2001092284A5
Application number: JP1999269609A
Authority: JP
Filing date: 1999-09-24
Publication date: 2004-12-02
Anticipated expiration: 2019-09-24

Description

【００１５】
【課題を解決するための手段】0015.
[Means for solving problems]

【００１６】
本発明の定着装置は、トナー像を担持する転写材を加熱加圧により定着する定着装置において、少なくとも２本の支持ローラに巻回されて回動可能な定着ベルトと、前記定着ベルトを加熱する加熱手段と、前記定着ベルトと定着する前記転写材とを重ねた状態で挟持搬送して加熱加圧することにより前記トナー像を担持する転写材を定着する少なくとも２本の加圧ローラと、を備え、前記定着ベルトに内接する前記支持ローラの回転軸の周囲を、気体層を介して密閉する中空円筒状の袋体となし、該袋体の内部圧力を、大気圧より高くしたことを特徴とするものである（請求項１）。0016.
The fixing device of the present invention is a fixing device that fixes a transfer material carrying a toner image by heating and pressurizing, and heats a fixing belt that is wound around at least two support rollers and can rotate, and the fixing belt. A heating means and at least two pressurizing rollers for fixing the transfer material carrying the toner image by sandwiching and transporting the fixing belt and the transfer material to be fixed in a stacked state and heating and pressurizing the transfer material are provided. The circumference of the rotation axis of the support roller inscribed in the fixing belt is formed as a hollow cylindrical bag body sealed via a gas layer, and the internal pressure of the bag body is made higher than the atmospheric pressure. (Claim 1 ).

【００１８】
本発明の画像形成装置は、前記請求項１〜５の何れか１項に記載の定着ベルト、加熱手段、加圧ローラ、温度センサから成る定着装置を備えて成ることを特徴とするものである（請求項６）。0018
The image forming apparatus of the present invention, which is characterized Fixing belt according to any one of the claims 1-5, heating means, pressure roller, by comprising a fixing device comprising a temperature sensor There is (claim 6 ).

Claims

In a fixing device for fixing a transfer material carrying a toner image by heat and pressure,
A fixing belt which is rotatable about at least two support rollers;
Heating means for heating the fixing belt;
And at least two pressure rollers for fixing the transfer material carrying the toner image by sandwiching and conveying the fixing belt and the transfer material to be fixed in a stacked state, and heating and pressing.
The circumference of the rotation shaft of the support roller inscribed in the fixing belt is a hollow cylindrical bag sealed via a gas layer, and the internal pressure of the bag is higher than atmospheric pressure. Fixing device.

The fixing device according to claim 1, wherein the bag body of the support roller is formed of an elastic resin, rubber, or a flexible thin film, or a laminated material of these.

The outer peripheral surface of the bag body of the support roller is formed in a drum shape in which the outer diameter of the central portion in the axial direction of the rotary shaft is larger than the outer diameters of both end portions. Fixing device as described.

2. The fixing device according to claim 1, wherein a flange member having an outer diameter larger than the outer diameter of the support roller is provided in the vicinity of both end portions of the rotation shaft of the support roller.

At least one of the at least two pressure rollers is supported so as to be press-contactable and can be separated, and is in a separated state for a part of time when the transfer material is not present at the transfer material nipping position; The fixing device according to claim 1, wherein the pressure roller holds the transfer material in a pressure contact state when passing between the pressure rollers.

An image forming apparatus comprising the fixing device according to any one of claims 1 to 5, a heating unit, a pressure roller, and a temperature sensor.