JP2001265149A - Heat insulation reinforced type quick heat roller and device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and inexpensively attain high-speed heating by a heat roller, by efficiently transmitting the heat generated in a heating resistor layer to a paper side. SOLUTION: As for the heat insulation reinforced type quick heat roller, that is, the quick heat roller 1 with the heating resistor layer 8 arranged on the outer peripheral surface of a cylindrical body 2, electrical insulating layers 6 and 10 are fixed tightly to the inside and outside surfaces of the layer 8, and a heat insulation reinforced layer 4 is arranged between the cylindrical body 2 and the electrical insulating layer 6, so that the heat generated by the layer 8 is not be transmitted to the cylindrical body 2, and the heat is transmitted efficiently to the paper side. Besides, a high thermal conductive heat transmission layer 12 is arranged on the outer surface side of the electric insulating layer 10 arranged outside the heating resistor layer 8, and the heat generated in the layer 8 is more efficiently transmitted to the paper side via the heat transmission layer 12. Accordingly, the temperature of the quick heat roller rises at a very high speed, the manufacture of the small-diameter quick heat roller is facilitated, and the manufacture of the very small-sized roller, whose temperature rises at a high speed and which satisfies measures for energy saving is facilitated and a very small-sized, high-speed temperature-rise fixing machine realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat roller for fixing a toner in an electrophotographic apparatus such as a copying machine and a printer, and more particularly, to a heat generation layer generated by a heat generating resistor layer on a cylindrical body side by a heat insulation enhancing layer. The present invention relates to a heat insulation-enhanced quick heat roller that blocks transmission of heat and adds a heat transfer layer to strongly transfer generated heat to a paper side, and an apparatus using the same.

[0002]

2. Description of the Related Art Generally, a toner fixing device in an electrophotographic apparatus such as a copying machine or a printer is configured by arranging a heat roller provided with a halogen lamp and a pressure roller in a pressure-contact state. The sheet on which the toner image has been transferred is passed between these rollers, and the toner image is heat-fixed by applying pressure simultaneously with heating, and the sheet after fixing is discharged.

However, since this heat roller uses the radiant heat of the halogen lamp, the heat generation efficiency is low, and it takes several minutes to several tens of minutes to reach the temperature required for heat fixing, for example, 160 ° C. At that time, power consumption was large, and energy saving measures were important. In the age of digital technology,
The development goals of the fixing device are reduced to the power consumption and the technology for shortening the heating time. Particularly, in the case of color equipment, high-speed temperature rise and uniformity of temperature distribution are the most important factors for high image quality.

In recent years, copying machines and printers have been
Because the system is used in conjunction with the A device, if there is an input signal to the copier or printer during standby, if the heating time of the heat roller is long, the system will not proceed, and the main factor that hinders the speeding up of the entire system is Become. That is, no matter how high the speed of the electronic device, it is difficult to increase the speed of the system unless there is a drastic solution regarding the high temperature rise of the toner fixing unit.

As described above, the conventional heat roller for fixing is provided with a light-emitting heating tube such as a halogen lamp as a heat source on the inner surface of a cylindrical body (also referred to as a metal tube), and heats the entire cylindrical body to a fixing temperature. Use after heating. For this reason, power consumption has increased, and it has been difficult to reduce the temperature raising time. Therefore, various proposals have been made to improve the light emitting heating tube system.

For example, a method has been proposed in which a heating resistor layer is wound around a cylindrical body to heat the current at high speed. The present inventors refer to this heat roller as a quick heat roller because of the ability to raise the temperature at a high speed. First, JP-A-55-
In JP-A-72390, JP-A-62-20038, and JP-A-63-158582, an electric insulating layer is formed on the outer peripheral surface of a cylindrical body made of a metal pipe and a heating resistor layer is formed thereon. A circumscribed type quick heat roller having a structure in which an electric insulating layer made of a high heat-resistant organic resin is provided and a release layer such as Teflon (registered trademark) (fluorine resin) is further provided on the surface thereof has been proposed.

[0007]

The electric insulating layer is provided to prevent leakage of current flowing through the heating resistor layer. However, since the heat generated by the heating resistor layer is evenly transmitted up and down through the electrical insulation layer, half of the generated heat is transmitted to the paper side and used for heat fixing, while the other half is transmitted in the opposite direction. Since the heat is wasted, the heat fixing efficiency of the paper is reduced, and as a result, the high-speed temperature rising characteristic of the heat roller is also insufficient.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to realize a high-speed heating of a heat roller by efficiently conducting heat generated in a heating resistor layer to a sheet side or a fixing endless belt side. is there.

[0009]

According to a first aspect of the present invention, there is provided a quick heat roller having a heating resistor layer provided on an outer peripheral surface side of a cylindrical body, wherein inner and outer surfaces of the heating resistor layer are narrowed by an electric insulating layer. , A heat insulation enhancement layer is provided between the cylindrical body and the electric insulating layer to prevent the heat generated by the heating resistor layer from being transmitted to the cylindrical body,
A heat insulation reinforced quick heat roller characterized by efficiently transmitting generated heat to the paper side.

According to a second aspect of the present invention, a heat transfer layer having a high thermal conductivity is provided on the outer surface side of the electrical insulating layer outside the heat generating resistor layer, and heat generated by the heat generating resistor layer is transferred through the heat transfer layer. The heat insulation reinforced quick heat roller according to claim 1, wherein the heat is efficiently transmitted to the paper side.

According to a third aspect of the present invention, the heat insulating reinforcing layer is made of a mixture of a heat resistant organic insulating material and a heat insulating filler.
Or a heat insulation reinforced quick heat roller according to 2.

According to a fourth aspect of the present invention, there is provided the heat insulation enhanced quick heat roller according to the second aspect, wherein the heat transfer layer is formed by mixing a metal powder or a metal oxide powder having a high thermal conductivity with a heat-resistant organic insulating material. .

According to a fifth aspect of the present invention, there is provided the quick heat roller according to the first or second aspect, wherein the electric insulating layer is made of a heat-resistant organic insulating material.

According to a sixth aspect of the present invention, there is provided the quick heat roller according to any one of the third to fifth aspects, wherein the heat-resistant organic insulating material is a polyimide resin.

According to a seventh aspect of the present invention, an endless belt for fixing is applied to the heat-insulating type quick heat roller according to any one of the first to sixth aspects, and the recording paper is applied while applying a load between the endless belt for fixing and the pressure roller. It is a heat insulation reinforced quick heat roller device which passes the toner image and fixes the toner image by heating and pressing at the same time.

The invention of claim 8 is the quick heat roller device according to claim 7, wherein the pressure roller is constituted by a quick heat roller for heating.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have made intensive studies to improve the above-mentioned disadvantages of the quick heat roller, and as a result, by disposing a heat insulating reinforcing layer between a cylindrical body and an electric insulating layer, a heating resistor layer was formed. The idea was to block the outflow of the heat flow generated in the above to the cylindrical body and consequently to allow the heat flow to flow out, that is, to the paper side. Further, in order to promote the outflow to the paper side, a heat transfer layer having a high thermal conductivity is arranged further outside the electric insulating layer on the outer surface of the heating resistor layer, and the heat flow interrupted by the heat insulation enhancing layer is reduced to the paper side. Thus, the present inventors came up with the idea that the heat flow can be efficiently conducted to the paper side by forcibly conducting the heat.

The present invention relates to efficient use of the heat generated in the heating resistor layer, and is characterized in that the heat flow to the cylindrical body is blocked by the heat insulation enhancing layer. The heat flow generated in the heating resistor layer flows out up and down evenly, and half of the heat flows to the paper side to contribute to the heat fixing of the paper. The other half of the heat flow is conducted to the cylindrical body side, and in the past, it was wasted heat and reduced thermal efficiency. In the present invention, the heat insulating layer prevents the heat flow from being transmitted to the cylindrical body, and functions to reverse the heat flow to the paper side. This inverted heat flow contributes to fixing of the sheet and improves the thermal efficiency.

Further, when the heat transfer layer is disposed in addition to the heat insulation reinforcing layer, the heat flow which flows straight and reversely into the outer surface and flows in is forcibly conducted to the paper side via the heat transfer layer, thereby improving the heat efficiency. Can be improved. Since the heat transfer layer has a large heat capacity, it can suck a large amount of heat, that is, the heat transfer layer exhibits the function of a heat pump. Accordingly, the heat flow can be efficiently transferred to the paper side or the endless belt for fixing, thereby increasing the heat fixing efficiency and realizing a high-speed temperature rise of the heat roller.

The electric insulating layer electrically insulates the current from the heating resistor layer, and is formed by coating an insulating powder or stretching an insulating film. The insulating material is divided into an inorganic insulating material and an organic insulating material. Inorganic insulating materials include mica, marble, ceramics, glass, and the like, and organic insulating materials include various known materials such as fibers, plastics, rubber, wax, and compounds. . In particular, a plastic film or the like can be used as an insulator layer as it is because the film itself can be formed into an extremely flat sheet.

In recent years, a heat-resistant organic insulating material has been used as an electrical insulating material for the heat generating portion, and a polyimide resin has been particularly attracting attention. This polyimide resin is formed into a film and stretched, or a polyimide resin is applied to form an electric insulating layer. This polyimide resin has good heat resistance and electrical insulation, and can be electrically insulated even if it is thin.

In general, the electric insulating material is often a heat insulating material and has an insulating effect. However, since the heat insulation effect is not sufficient only with the electric insulation layer, the heat insulation function is arranged between the electric insulation layer and the cylindrical body, and the heat insulation function is enhanced by the heat insulation reinforcement layer in addition to the heat insulation function of the electric insulation layer. It was to be. If the material of the heat-insulating reinforcing layer is made of an inexpensive heat-insulating substance, the price can be set at a low price even if the heat-insulating reinforcing layer is thick.
For example, a heat-insulating filler may be uniformly mixed and applied to a liquid heat-resistant organic insulating material.

Polyimide varnish can be used as a kind of liquid heat-resistant organic insulating material. In addition, a heat-resistant material having low thermal conductivity can be used as the heat-insulating filler. Examples of the heat-insulating filler include alumina, glass, glass wool, various ceramics, refractory bricks, sand grains, various oxides, various metal oxides, and the like. Use reinforced material.

Since a liquid polyimide varnish is expensive, if the amount of the polyimide is reduced and a large amount of inexpensive heat insulating filler powder is filled and mixed, an inexpensive heat insulating material as a whole can be provided. The heat-insulating filler is also an electric insulating material, and exhibits an electric insulating function as well as a heat insulating function. Insulating fillers that are particularly frequently used in embodiments of the present invention are oxides, and metal oxides and non-metallic oxides can be used. For example, Al
_{There are 2} O ₃ , ZrO ₂ , SiO _{2 and the} like.

Since the heat-insulating reinforcing layer is filled and mixed with the heat-insulating filler powder, it has a property of easily absorbing moisture, gas molecules and the like from the surface. This absorption may reduce the heat insulation performance. However, in the present invention, the heat-insulating reinforcing layer is provided in parallel with the electric insulating layer, and as a best mode, if both layers are formed in close contact with each other, the dense electric insulating layer becomes a coating film of the heat-insulating reinforcing layer, and water and gas molecules are prevented from forming. Block absorption. As a result, a high degree of heat insulation performance can be maintained.

Therefore, by providing the heat insulation enhancement layer together with the electric insulation layer, not only the heat insulation function can be enhanced, but also the electric insulation function can be enhanced, and the heat insulation enhancement layer can be protected.

The heat transfer layer is formed by forming a heat conductive material having a high thermal conductivity in a layer. To form the layer, a heat transfer material may be applied, or a heat conductive film may be stretched. As long as it has a high thermal conductivity, the heat conductive material may be a single substance or a mixed substance. For example, a heat conductive material can be formed by adding a metal powder or a metal oxide powder having a high thermal conductivity to a liquid heat-resistant organic insulating material. In this case, the thermal conductivity and the heat capacity can be arbitrarily adjusted by the amount of the metal powder or the metal oxide powder having a high thermal conductivity.

As the heat-resistant organic insulating material, various known materials can be used. In recent years, a polyimide resin has been often used. The liquid polyimide resin is called a polyimide varnish, and a suitable amount of a metal powder or a metal oxide powder having a high thermal conductivity is mixed with the polyimide varnish. Any metal can be used as the metal powder, for example, Zn, Al, Fe,
There are Cu, Ag, Pt, Mn, Mo and the like. Of course, alloys such as brass and bronze can also be used. Furthermore, high-purity aluminum oxide (Al2O3) powder can also be used as the metal oxide powder having high thermal conductivity.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a circumscribed quick heat roller. On the outer peripheral surface of a cylindrical body 2 such as an aluminum pipe, a heat-insulating reinforcing layer 4, an electric insulating layer 6, a heating resistor layer 8, an electric insulating layer 10, a heat transfer layer 11, and a release layer 1 on the outermost surface.
2 are laminated in this order. Insulating rings 14 and 14 are provided on both end surfaces of the cylindrical body 2,
6 and 16 are provided outside. Both ends of the heating resistor layer 8 and the terminals 16 for energization are electrically connected by connecting portions 18, 18.

When a voltage is applied between the current-carrying terminals 16, 16, a current flows through the heat-generating resistor layer 8 via the connection portion 18,
This energization generates Joule heat in the heating resistor layer 8. Since both surfaces of the heating resistor layer 8 are tightly attached by the electric insulating layers 6 and 10, current does not leak inside and outside.

On the other hand, the heat generated from the heating resistor layer 8 is transferred to the inside and outside. However, on the inside, a heat-insulating reinforcement layer 4
Since the heat transfer layer 11 having a high thermal conductivity is provided on the outside, the generated heat is efficiently transferred to the release layer 12 through the heat transfer layer 11.
And heat is effectively fixed. Such improvement in thermal efficiency has realized high-speed heating of the heat roller. The release layer 12 is provided for facilitating the peeling of the sheet after fixing, but is not required when an endless belt for fixing is used.

Each of these layers is applied and formed on the outer periphery of the cylindrical body 2. Various known methods such as an infiltration and dipping method, a brush method, and a spray method can be used for the coating method. A special screen printing method is most suitable for controlling the film thickness and reproducibility.
The electric insulating layers 6 and 10 are formed of a polyimide resin, and the heat-insulating reinforcing layer 4 is formed by mixing ZrO ₂ powder with the polyimide resin. The heat transfer layer 11 is formed by filling and mixing aluminum powder or high-purity aluminum oxide (alumina) powder in a polyimide varnish.

Both ends of the quick heat roller 1 dissipate a large amount of heat from the current-carrying terminals. Therefore, when the heating resistor layer 8 is manufactured, it is necessary to increase the resistance value at both ends to increase the amount of heat generated at the time of energization and to make the temperature distribution in the horizontal direction uniform (± 5% or less).

On the other hand, the heat generated from the heating resistor layer 8 is transferred inward and outward. The heat insulation enhancement layer 4 and the electric insulation layer 6 exist on the inside, and the electric insulation layer 10 and the heat transfer layer 1 exist on the outside.
There is one. The heat flow flowing inward is blocked by the heat-insulating reinforcing layer 4 and reversed to the paper side. The inverted heat flow and the heat flow flowing out of the heating resistor layer 8 flow out through the heat transfer layer 11 having a high thermal conductivity to assure heat fixing and high-speed heating of the sheet.

FIG. 2 is a schematic explanatory view of a heat fixing method using a quick heat roller according to the present invention. The quick heat rollers 1 and 1 of the present invention are arranged opposite to each other in a pressed state. The paper P on which the toner image T is formed is applied to both rollers 1, 1
When the toner image T is inserted between the rollers 1 and 1 in the direction of arrow a, the toner image T is heat-fixed by the rollers 1 and 1 to form a fixed image H and the sheet P is discharged.

FIG. 3 is a schematic explanatory view of a color fixing device using a quick heat roller and an endless fixing belt according to the present invention. Reference numeral 20 denotes a heating roller, 24 denotes a pressure roller, 26 denotes a driving roller, 28 denotes a cleaning roller, 30 denotes an oil roller, 32 denotes an endless belt for fixing, and 34 denotes a temperature detection thermistor. The heating roller 20 is constituted by the heat insulation enhanced quick heat roller 1 of the present invention.

The heating roller 20 is an endless belt 3
2 is heated to a predetermined temperature, and the rotation of the drive roller 26 causes the paper P to be transferred to the endless belt 32 and the pressure roller 24.
Run between. The toner image T is fixed by the heat of the endless belt 32 and the pressure of the pressure roller 24. Since the endless belt 32 is surface-bonded to the sheet P, the fixing time is long and the fixing is reliably performed.

On the surface of the fixing endless belt 32,
A fluororesin layer (Teflon) or a silicon resin layer is formed as a release layer. A thermistor 34 measures the temperature of the surface of the fixing endless belt to control the temperature of the entire fixing system. When speeding up the heating, the pressure roller 24 may be constituted by the heat insulation reinforced quick heat roller 1 of the present invention.

FIG. 4 is a schematic explanatory view of a simple fixing device using a quick heat roller and an endless belt for fixing according to the present invention. The difference from FIG. 3 is that a fixing and driving roller 22 is provided, and this roller is a fixing roller and also has the function of a driving roller. The same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The endless belt 32 is a heating roller 20
The paper P is conveyed between the fixing and driving roller 22 and the pressure roller 24, and is thermally fixed by the fixing endless belt 32. Unlike FIG. 3, in this apparatus, the paper P is an endless belt 32.
And point bonding. In order to increase the speed of thermal fixing, the heating roller 20, the fixing and driving roller 22, and the pressing roller 2
All of 4 can be constituted by the heat insulation enhanced type quick heat roller 1 of the present invention.

The present invention is not limited to the above embodiment, but includes various modifications and design changes within the technical scope of the present invention without departing from the technical spirit of the present invention. Nor.

[0042]

According to the first aspect of the present invention, since the heat-insulating reinforcing layer and the electric insulating layer are provided on the surface of the cylindrical body, the heat flow flowing to the cylindrical body can be cut off and reversed to the paper side. Can be increased. Therefore, the heat efficiency of the heat fixing can be improved, and the ultra-high speed heating of the external quick heat roller can be realized. The provision of the heating resistor layer on the outside facilitates the production of a small-diameter quick heat roller, facilitates the production of a roller that satisfies ultra-compact, high-speed heating, and energy-saving measures. It implements the device.

According to the second aspect of the present invention, in the case of the circumscribing type quick heat roller, the heat insulation reinforcing layer and the electric insulation layer are provided on the surface of the cylindrical body, and the electric insulation layer and the heat transfer layer are provided outside the heating resistor layer. Since the heat transfer layer is provided, both the direct heat flow and the reverse heat flow by the heat insulation enhancement layer can be conducted to the paper side at a stretch by the heat transfer layer.
Therefore, the heat fixing efficiency can be further improved.

According to the third aspect of the present invention, since the heat-insulating reinforcing layer is composed of a mixture of a heat-resistant organic insulating material and a heat-insulating filler, the degree of heat insulation and the film thickness can be adjusted by adjusting the amount of the heat-insulating filler added. .

According to the fourth aspect of the present invention, the heat transfer layer is made of a mixture of a heat-resistant organic insulating material and a metal powder or a metal oxide powder having a high thermal conductivity. The heat transfer characteristics can be arbitrarily adjusted depending on the blending amount.

According to the fifth aspect of the present invention, since the electric insulating layer is made of a heat-resistant organic insulating material, a large electric insulating effect can be obtained even if it is relatively thin. Further, if the outer electric insulating layer is formed to be thin, heat can be relatively transmitted while performing an electric insulating action, and the efficiency of heat flowing into the heat transfer layer is increased. In addition, if an insulating metal oxide powder having a high thermal conductivity is used as the heat transfer layer material, an electric insulating layer provided therewith becomes unnecessary, and the structure can be simplified and, at the same time, the speed can be further increased by increasing the number of layers. Expect warmth.

According to the sixth aspect of the present invention, since the heat-resistant organic insulating material is made of a polyimide resin, the electric insulating effect can be exerted with a relatively small amount, and even if the heat roller is designed at a high temperature, a sufficient heat-resistant resin can be obtained. Has an effect.

According to the seventh aspect of the present invention, a belt-type fixing method using a heat insulation-enhanced quick heat roller is proposed. Since a small-diameter quick heat roller can be used, high-speed temperature rise and energy saving are achieved. An ultra-compact multi-function color fixing system that has a countermeasure can be realized.

According to the eighth aspect of the present invention, since the pressure roller is constituted by the quick heat roller of the present invention, a further high-speed fixing system can be realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional configuration diagram of a heat insulation reinforced quick heat roller according to the present invention.

FIG. 2 is a schematic explanatory diagram of a heat fixing method using a heat insulation-enhanced quick heat roller according to the present invention.

FIG. 3 is a schematic explanatory view of a color fixing device using a heat insulation enhanced quick heat roller according to the present invention.

FIG. 4 is a schematic explanatory view of a simple fixing device using a heat insulation enhanced quick heat roller according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Quick heat roller 2 ... Cylindrical body 4 ... Heat insulation reinforcement layer 6 ... Electric insulation layer 8 ... Heating resistor layer 10 ... Electric insulation layer 11 ...・ Heat transfer layer 12 ・ ・ Release layer 14 ・ ・ ・ Insulation ring 16 ・ ・ ・ Terminal for energization 18 ・ ・ ・ Connection part 20 ・ ・ ・ Heating roller 22 ・ ・ ・ Fixing and driving roller 24 ・ ・ ・ Pressing roller 26 drive roller 28 cleaning roller 30 oil roller 32 fixing endless belt 34 temperature detecting thermistor H fixed image P paper T Toner image

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 3/00 335 H05B 3/00 335 // C08K 3/00 C08K 3/00 3/08 3/08 3 / 22 3/22 C08L 101/12 C08L 101/12 (72) The inventor Takeshi Nishi 2-7-19 Emission West 2-chome, Joto-ku, Osaka-shi, Osaka Dai-ken Kagaku Kogyo Co., Ltd. F-term (reference) 2H033 AA42 BA11 BA12 BA25 BA26 BA34 BB03 BB04 BB08 BB13 BB14 BB19 BB21 3J103 AA02 AA15 BA05 FA01 GA02 GA57 GA58 HA03 HA13 HA22 HA46 HA60 3K058 AA02 AA81 AA87 AA91 AA95 BA18 CE13 CE17 DA03 DA24 DA26 GA06 4J002 DM6 0 GQ00

Claims (8)

[Claims] In a quick heat roller provided with a heating resistor layer on the outer peripheral surface side of a cylindrical body, the inner and outer surfaces of the heating resistor layer are tightly fitted with electrical insulating layers and to form the cylindrical body.
A heat insulation enhancing layer 4 is provided between the heat insulating layer 6 and the electric insulating layer 6 to prevent the generated heat of the heating resistor layer 8 from being transmitted to the cylindrical body 2 and to efficiently transmit the generated heat to the paper side. Heat insulation type quick heat roller. 2. A heat transfer layer 12 having a high thermal conductivity is provided on the outer surface side of the electric insulating layer 10 outside the heat generating resistor layer 8, and heat generated by the heat generating resistor layer 8 is efficiently transmitted through the heat transfer layer 12. The heat insulation enhanced quick heat roller according to claim 1, wherein the heat is electrically transmitted to the paper side. 3. The heat-insulating type quick heat roller according to claim 1, wherein the heat-insulating reinforcing layer 4 is made of a mixture of a heat-resistant organic insulating material and a heat-insulating filler. 4. The heat insulating type quick heat roller according to claim 2, wherein the heat transfer layer 12 is formed by mixing a metal powder or a metal oxide powder having a high thermal conductivity into a heat-resistant organic insulating material. 5. The quick heat roller according to claim 1, wherein the electric insulating layers are made of a heat-resistant organic insulating material. 6. The heat insulation enhanced quick heat roller according to claim 3, wherein the heat-resistant organic insulating material is a polyimide resin. 7. An endless belt for fixing is applied to the heat insulation enhanced type quick heat roller according to claim 1, and a recording paper is passed while applying a weight between the endless belt for fixing and the pressure roller. Insulation-enhanced quick heat roller device that fixes a toner image by pressing simultaneously with heating. 8. The heat insulation-enhanced type quick heat roller device according to claim 7, wherein the pressure roller 24 is constituted by a quick heat roller for heating.