JPH09319243A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly heat a heating roller with good efficiency without causing irregular temperature by providing a heat moving means in which a heating medium is sealed and moving the heating medium according to the temperature difference of the surface of the heating roller. SOLUTION: The heating roller 2 is substantially constituted of a plane type heat pipe (heat moving means) 10. The material of the pipe 10 is copper, and water is used as the heating medium in the pipe 10. The entire heat radiation part of the pipe 10 is coated with a pipe 11 functioning as an iron hollow roller tube being a ferromagnetic body by means of press-fitting. By such constitution, the water in the pipe 10 flows from a part where the temperature of the roller 2 is high to a part where it is low because of the temperature rise of the roller 2, and heat conductivity is improved. Thus, the heat is uniformly generated in the shift direction of the roller 2, and a rise time is shortened, then the irregular temperature in heating distribution of the roller 2 against an eddy current generating position is eliminated, and the irregular temperature in the shaft direction of the roller 2 is also eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device mounted on an image forming apparatus such as an electrostatic copying machine or a laser printer.

[0002]

2. Description of the Related Art Conventionally, a heating roller type fixing device is provided with a heating roller for heating a sheet carrying a developer image made of a powder developer and a pressure roller for conveying while applying pressure. By passing the sheet through a fixing point which is a pressure contact portion (nip portion) with the pressure roller, the developer on the sheet is fused and pressure-bonded to be fixed.

In a conventional fixing device for an electrophotographic apparatus, a halogen lamp or the like is used as a heat source and is installed inside a metal roller. Due to the heat generated by the halogen lamp, the heating roller is heated, and the object to be fixed is pressed against the heating roller by the elastic roller, and the rotation of these rollers causes the object to be fixed to pass through as described above. Fix it. This method is generally used, but in addition, a non-contact heating method using a flash lamp has been put into practical use.

[0004]

However, in the past, since the lamp was used as the heating source, that is, the electric energy is once converted into light and heat and is transmitted to the heating roller by radiation, the heating efficiency is increased. Was poor (there is a limit of about 70% in thermal efficiency).

Further, since the lamp is structurally arranged inside the roller and the roller is used by heating from the inside, the outside of the roller required for the fixing operation is at an appropriate temperature (for example, 180 ° C.).
There was a large loss of energy up to, and much time and power were required at startup.

Therefore, it has been considered to reduce the heat capacity of the heating roller to shorten the rising time. That is, the thickness of the roller is reduced. However, when the roller is thinned, temperature unevenness occurs in the axial direction of the roller depending on the size of the paper.

Therefore, it is necessary to perform complicated control or take measures such as inserting two lamps. Moreover, there is a problem that it can be used only in a low-speed copying machine.

Further, because of the power supply mechanism to the lamp, the lamp requires a complicated structure in which the lamp is fixed and the metal roller is rotated around the lamp. Therefore, there is a structural limit to downsizing the fixing device.

As a means for solving these problems, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-295414, there is one which uses a heating member for generating an eddy current by an induction heating device as a roller.

However, in practice, it is difficult for the heating caused by the eddy current to uniformly heat the roller itself. That is, the thermal conductivity is low only with the heating member that is a magnetic material, and the temperature unevenness occurs in the heating roller.

In this case, there is a problem that temperature unevenness occurs not only at the time of start-up but also due to a change in the size of the paper to be fixed, and improvement has been desired. Therefore,
It is an object of the present invention to provide a fixing device capable of heating a heating roller efficiently and uniformly without causing temperature unevenness.

[0012]

In order to solve the above-mentioned problems, the present invention provides a heating roller for heating a material to be fixed and a heating roller for applying pressure to the material to be fixed. A pressure roller, the heating roller has a hollow roller tube made of a magnetic material, and a conductor wire facing the outer surface of the hollow roller tube, and by applying a high-frequency current to the conductor wire, Induction heating means for inductively heating the outer surface of the hollow roller tube, and heat transfer means for enclosing a heat medium and inserting the heat medium into the hollow roller tube to move the heat medium according to the temperature difference of the hollow roller tube. To have.

According to a seventh aspect of the present invention, there is provided a heating roller that heats the material to be fixed, and a pressure roller that presses the material to be fixed to the heating roller, and the heating roller is made of a magnetic material and is hollow. A roller tube and a coil-shaped conductor wire inserted into the hollow roller tube, and induction heating means for inductively heating the hollow roller tube by applying a high-frequency current to the conductor wire and a heat medium are enclosed. And a heat transfer means that is inserted into the thick portion of the hollow roller tube and moves the heat medium according to the temperature difference of the hollow roller tube.

According to an eighth aspect of the present invention, there is provided a heating roller for heating the material to be fixed, and a pressure roller for pressing the material to be fixed on the heating roller, wherein the heating roller is a hollow body made of a magnetic material. An induction heating unit that has a roller tube and a conductive wire member facing the outer surface of the hollow roller tube, and applies high-frequency current to the conductive wire material to induce induction heating on the outer surface of the hollow roller tube; and a heat medium. Is inserted into the thick portion of the hollow roller tube and moves the heat medium according to the temperature difference of the hollow roller tube.

According to a ninth aspect of the present invention, there is provided a heating roller that heats the material to be fixed and a pressure roller that presses the material to be fixed to the heating roller, and the heating roller is made of a magnetic material. An induction heating means for inducing the outer surface of the solid roller by induction heating the outer surface of the solid roller by applying a high-frequency current to the outer surface of the solid roller; And a heat transfer means for enclosing the heat medium and inserting the heat medium in the solid roller to move the heat medium according to the temperature difference of the solid roller.

According to a tenth aspect of the present invention, there is provided a heating roller that heats the material to be fixed, and a pressure roller that presses the material to be fixed to the heating roller, and the heating roller is a hermetically sealed magnetic body. Type hollow roller, and an induction heating means for inductively heating the outer surface of the hollow roller by applying a high frequency current to the outer surface of the hollow roller, and by applying a high frequency current to the outer surface of the hollow roller; A heat medium that is enclosed in a roller and moves according to the temperature difference of the hollow roller.

According to a twelfth aspect of the present invention, there is provided a heating roller for heating the material to be fixed and a pressure roller for pressing the material to be fixed on the heating roller, and the heating roller is a hermetically sealed magnetic body. Type hollow roller, a rubber layer covering the outer peripheral surface of the hollow roller excluding its one end side, a heating means for heating the one end side of the hollow roller, and a heating means enclosed in the hollow roller for heating. A heating medium that moves in the axial direction of the hollow roller by being heated by means.

The present invention comprises a heat transfer means for enclosing the heat medium, and by moving the heat medium due to the temperature difference on the surface of the heating roller, the thermal conductivity of the heating roller is improved and the temperature unevenness on the surface of the heating roller is reduced. Prevents the occurrence and enables good fixing.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to an embodiment shown in FIGS. FIG. 1 is a perspective view showing the overall configuration of a fixing device. The fixing device 1 includes a heating roller 2
(Φ20 mm) and a pressure roller 3 (φ20 mm) that is pressed against the lower side of the heating roller 2 (φ20 mm). The pressure roller 3 is pressed against the heating roller 2 by a pressure mechanism (not shown) and is maintained to have a constant nip width.

The heating roller 2 is rotationally driven in the arrow direction by a drive motor (not shown), and the pressure roller 3 is driven to rotate in the arrow direction. These heating rollers 2
By passing the paper P as a transfer material through a fixing point, which is a pressure contact portion (nip portion) between the pressure roller 3 and the pressure roller 3, the developer on the paper P is fused and pressure-bonded to be fixed. ing.

The conductor wire 4 serving as the induction heating means K has a wire diameter of 1
The mm conductive wire is configured as a litz wire, which is wired in parallel in a portion other than the roller surface contact portion (nip) according to the curvature, and a high frequency current is passed. The distance between the heating roller 2 and the conductor wire 4 is about 8 mm.

FIG. 2 is a front view showing the fixing device. On the periphery of the heating roller 2, a peeling claw 6 for peeling the paper P from the heating roller 2, and a release mold for offset prevention in order to reduce toner adhesion (offset) on the outer peripheral surface of the heating roller 2. Application device 7 for applying the agent, and heating roller 2
A thermistor 8 for detecting the surface temperature of the is provided.

3 and 4 are sectional views showing a specific structure of the heating roller 2. The heating roller 2 has an outer diameter of 19 m.
The basic configuration is a plain type heat pipe (heat transfer means) 10 having m, a thickness of 1 mm, and a length of 330 mm. The material of the heat pipe 10 is copper, and water 12 is used as the heat medium. A pipe (hollow roller pipe) 11 as a hollow roller pipe made of iron, which is a ferromagnetic material and has an outer diameter of 20 mm and a thickness of 0.5 mm, is arranged on the entire heat dissipation portion of the heat pipe 10.
Are covered by means such as press fitting.

The surface of the ferromagnetic pipe 11 is covered with a 20 μm PFA tube 13 as a release layer. Therefore, the conductor wire 4 wired in parallel has a high-frequency current generated in the high-frequency oscillator, for example, a frequency of 100.
A high frequency current of kHz and output of 800 W is passed. As a result, magnetic flux is generated in the conductive wires 4 arranged in parallel to generate an eddy current in the heating roller 2, and Joule heat is generated by this eddy current, so that the surface of the heating roller 2 is heated. The surface temperature of the heating roller 2 is set to 180 ° C.

Due to the temperature rise of the heating roller 2, the water 12 of the heat pipe 10 flows from the high temperature portion to the low temperature portion of the heating roller 2 and the thermal conductivity is improved. As a result, heat is uniformly generated in the roller axis direction of the heating roller 2, the rise time is shortened, and temperature unevenness of the heating distribution of the heating roller 2 with respect to the position where the eddy current is generated is eliminated. Axial temperature unevenness is also eliminated.

FIG. 5 shows a second embodiment. In the second embodiment, the structure of the fixing device is the same as that of the first embodiment except the arrangement of the conducting wires, and therefore the description of the fixing device itself is omitted.

The conducting wire 20 serving as a heating means is constituted by a litz wire having a linear length of 1 mm, and the conducting wire 20 is arranged in a portion other than the roller surface contact portion (nip) while being folded back to a portion which does not come into contact with the paper P. A high-frequency current is passed through 20.

Although the magnetic flux is generated differently from that of the first embodiment due to the arrangement of the conducting wire 20, an eddy current is generated in the heating roller 21, and Joule heat is generated by this eddy current, so that the surface of the heating roller 21 rises. Be warmed.

As a result, the same effect as that of the first embodiment can be obtained. Further, if the nip width cannot be increased as the diameter of the heating roller 21 is reduced, a rubber layer may be provided on the surface of the heating roller 21.

FIG. 6 shows the third embodiment, in which a plurality of circular coils 31 are arranged at a certain distance from the heating roller 30 (8 mm in this embodiment). And).

The coil 31 is constructed by using a litz wire having a wire diameter of 1 mm as a litz wire. Due to the arrangement of the coil 31, an eddy current is generated in the heating roller 31, and Joule heat is generated by the eddy current to raise the temperature of the surface of the heating roller 31. The induction heating by the coil 31 heats only a certain area in the roller axial direction, and the roller 31 rotates to heat the entire area of the roller 31.

Further, since it is possible to heat the same area as the nip width, it is possible to save a lot of space on the outer circumference of the roller 31. Further, the thermal efficiency can be improved by disposing the nip near the upstream side in the rotation direction.

Also in this embodiment, the same effect as that of the first embodiment can be obtained. 7 to 9 show a fourth embodiment. FIG. 7 is a sectional view showing the heating roller 35.

The heating roller 35 is composed of a hollow roller 36 made of a ferromagnetic material, and a plurality of (eight) heat pipes 37 as heat transfer means press-fitted into the thick portion of the hollow roller 36. Has been done.

The heating roller 35 has a diameter of 40 mm, a length of 320 mm and a wall thickness of 10 mm. The heat pipe 37 has an outer diameter of 3 mm and a width of 315 mm. The material of the heat pipe 37 is copper, and water is used as the heat medium.

The inside of the heating roller 35 is shown in FIGS.
As shown in FIG.
, And an iron core 39 is inserted in the coil 38.

Thus, the coil 3 inside the heating roller 35
When a high frequency current is passed through the coil 8, a magnetic field is generated by the coil 38, and an induced current flows through the heating roller 35. Due to the resistance of the roller 35 due to this current, Joule heat is generated and the heating roller 35 is heated.

In this embodiment, a high frequency current having a frequency of 100 kHz and an output of 800 W was passed through the coil 38. The surface temperature was set to 180 ° C. Heating roller 35
The heating time is shortened because it is heated uniformly.

Further, the temperature unevenness of the heating distribution of the roller with respect to the position where the eddy current is generated is alleviated by the heat pipe 37, and the heat flows to the low temperature part. This eliminates the temperature unevenness in the axial direction. Also, it has better thermal efficiency than the halogen lamps used conventionally.

FIG. 10 shows a fifth embodiment. In this embodiment, the heating roller 40 is the same heating roller as in the fourth embodiment.

Further, as in the case of the first embodiment, the conducting wires 41 arranged in parallel are arranged so that a high frequency current can flow. The distance between the heating roller 40 and the conducting wire 41 is about 8 mm.

According to this structure, it is possible to obtain the same effect as that of the above-mentioned embodiment. Further, FIG. 11 shows a sixth embodiment. In the sixth embodiment, the heating roller 42 has the same configuration as that of the above-described fourth embodiment, and the conductive wire 42 is the same as in the second embodiment except for the roller surface contact portion (nip). The portion is formed by folding back the portion that does not come into contact with the paper, and a high frequency current is applied to this conducting wire 42.

According to this structure, it is possible to obtain the same effect as the above. FIG. 12 shows a seventh embodiment. In the seventh embodiment, the heating roller 4
3 has the same configuration as that of the heating roller 35 of the fourth embodiment, and the coil 44 has a plurality of circular coils 44 formed at a constant distance from the heating roller 43 as in the third embodiment. It is arranged so that a high frequency current is applied.

By using this structure, it is possible to obtain the same effect as that of the above-mentioned embodiment. FIG. 13 shows an eighth embodiment. FIG. 13 is a sectional view showing the heating roller 45.

The heating roller 45 has a structure in which four heat pipes 46 are press-fitted into a solid roller 45A made of a ferromagnetic material. The heating roller 45 has a diameter of 20 mm and a length of 320 mm. The heat pipe 46 has an outer diameter of 5 mm and a width of 315 mm.

The material of the heat pipe 46 is copper, and water is used as the heat medium. The press-fitting position of the heat pipe 46 is arranged radially from the center position of the roller 45A, and the distance between the center position of the heat pipe 46 and the center position of the solid roller 45A is 6.5 mm, which is within a range in which strength can be maintained. The heat pipe 46 is arranged so as to be as close to the outer surface of the roller as possible.

As shown in FIG. 14, the conducting wire 47 serving as heating means is composed of a linear 1 mm conducting wire made of a litz wire, and is arranged in parallel in a portion other than the roller surface contact portion (nip) according to its curvature. Are arranged so that high-frequency current can flow. The distance between the heating roller 45 and the conducting wire 47 is about 5 mm.

In this embodiment, the conductor 47 has a frequency of 1
A high frequency current of 00 kHz and an output of 800 W was passed. As a result, a magnetic flux is generated in the conductive wires 47 arranged in parallel to generate an eddy current, and this current generates Joule heat to heat the surface of the heating roller 45.

The surface temperature of the heating roller 45 was set to 180 ° C. Since the heat is uniformly generated in the axial direction of the heating roller 45, the rising time is shortened.

Further, the temperature unevenness of the heating distribution of the roller 45 with respect to the position where the eddy current is generated is alleviated by the heat pipes 46, and the heat flows to the low temperature portion. This eliminates the temperature unevenness of the heating roller 45 in the axial direction.

Further, in this fixing device, the solid roller 45 is
Since the roller is heated from the outside by using A, the diameter can be reduced and the fixing device can be downsized. Further, heating by electromagnetic induction has a skin effect, that is, it has a property of heating only the outer surface of the roller. This allows heat to be efficiently transferred to the rollers.

If the nip width cannot be increased due to the reduction in diameter, a rubber layer may be provided on the roller surface to increase the nip. In the case of induction heating, heating can be performed efficiently even if the heating source (conductor) is away from the object to be heated (roller), and it is effective in that heating can be performed without problems even if a rubber layer is provided on the roller.

FIG. 15 shows a ninth embodiment. In the ninth embodiment, the heating roller 45 is the eighth roller.
As in the second embodiment, the conductor 48 may be arranged in the same manner as the conductor arranged in the second embodiment.

That is, the roller surface contact portion (nip)
It is also possible to dispose a conducting wire 48 in a portion other than the above while folding back the portion that does not come into contact with the paper, and to apply a high frequency current to this conducting wire 48.

Due to the arrangement of the conducting wire 48, an eddy current is generated in the heating roller 45, and Joule heat is generated by this eddy current to raise the temperature of the surface of the heating roller 45. As a result, the same effect as that of the eighth embodiment can be obtained.

FIG. 16 shows a tenth embodiment. The heating roller 50 of the tenth embodiment is the same as that of the eighth and ninth embodiments.

That is, the heat pipes 46 are press-fitted into the solid roller 45A. In the heating method, a plurality of circular coils 51 are arranged at a fixed distance (5 mm in the present invention) from the heating roller 50.

This coil 51 is constructed by using a linear 1 mm wire as a litz wire. Due to the arrangement of the coil 51, an eddy current is generated in the heating roller 50, and Joule heat is generated by the eddy current to raise the temperature of the surface of the heating roller 50.

The induction heating by the coil 51 heats only a certain area in the roller axial direction, and the roller 50 rotates to heat the entire area of the roller. Further, since it is possible to heat the same area as the nip width, it is possible to save a lot of space on the outer circumference of the roller.

Further, the thermal efficiency can be improved by disposing the nip in the vicinity of the upstream side in the rotating direction. According to this invention, the same effect as that of the first embodiment can be obtained.

17 to 19 show the eleventh embodiment. 17 and 18 are sectional views showing the heating roller 52. FIG. 19 is a perspective view showing a fixing device.

The heating roller 52 is basically composed of a hollow roller 52A made of a ferromagnetic material. In this embodiment, iron is used as the material of the hollow roller 52A.

Further, the end of the hollow roller 52A is in a closed state, and the liquid 53 is sealed as a heat medium in the hollow roller 52A. Alcohol is used as the liquid 53. The liquid 53 is filled to about 30% of the volume.

The heating structure has the same structure as that of the first embodiment. That is, the conductive wire 54 serving as the heating means is
A linear 1 mm conductive wire is composed of a litz wire, and a conductive wire 54 arranged in parallel is arranged in a portion other than the roller surface contact portion (nip) so as to correspond to the curvature, and a high frequency current is passed. The distance between the heating roller 52 and the conducting wire 54 is about 5 mm.

In the eleventh embodiment, a high frequency current having a frequency of 100 kHz and an output of 800 W is passed through the conductor 54. As a result, magnetic flux is generated in the conductive wires 54 arranged in parallel to generate an eddy current in the heating roller 52, and Joule heat is generated by this eddy current to heat the surface of the heating roller 52.

The surface temperature of the heating roller 52 was set to 180 ° C. Since the roller axis direction of the heating roller 52 is uniformly heated, the rising time is shortened.

Conventionally, temperature unevenness of the heating distribution of the roller with respect to the position where the eddy current is generated has occurred. However, due to the liquid 53 sealed in the roller 53, heat is not only transferred from a high temperature region by heat conduction but also this liquid. It flows to a low temperature region via 53.

As a result, it is possible to prevent the temperature unevenness that has conventionally occurred and to make the temperature uniform quickly. In addition, since the roller itself has a simple structure, the cost can be reduced. FIG. 20 shows the first
2 shows the second embodiment.

In the twelfth embodiment, the heating roller 52 has the same structure as in the eleventh embodiment, but the conductor wire 57 is arranged in the same manner as in the second embodiment. You may make it the same as the method of.

That is, the roller surface contact portion (nip)
The conducting wire 57 may be arranged so as to be folded back to the portion other than the portion which does not come into contact with the paper, and the high frequency current may be applied to the conducting wire 57.

Due to the arrangement of the conducting wire 57, an eddy current is generated in the heating roller 52, and Joule heat is generated by this eddy current to raise the temperature of the surface of the heating roller 52. Since the heating roller 52 has the same structure, the temperature unevenness of the roller 52 is eliminated.

As a result, the same effect as that of the eleventh embodiment can be obtained. FIG. 21 shows a thirteenth embodiment. The heating roller 55 of this embodiment is the same as that of the eleventh and twelfth embodiments.

That is, the working fluid 53 is sealed in the ferromagnetic roller 52A. In the heating method, a plurality of circular coils 56 are arranged at a constant distance from the heating roller 55 (5 mm in the present invention).

The coil 56 is composed of a litz wire with a linear wire of 1 mm. Due to the arrangement of the coil 56, an eddy current is generated in the heating roller 55, and Joule heat is generated by this eddy current to raise the temperature of the surface of the heating roller 55. The induction heating by the coil 56 heats only a certain area in the roller axial direction, and the heating roller 55 rotates to heat the entire area of the roller.

Further, since it is possible to heat the same area as the nip width, it is possible to save a lot of space on the outer circumference of the roller. Further, the thermal efficiency can be improved by disposing the nip in the vicinity of the upstream side in the rotation direction.

In this invention, since the heating roller 55 has the same structure as that of the eleventh embodiment, the temperature unevenness of the roller 55 is eliminated. As a result, the same effect as that of the eleventh embodiment can be obtained.

FIG. 22 is a sectional view of the heating roller 60 and the press roller 63 according to the 14th embodiment. The heating roller 60 has an outer diameter of 12 mm, a thickness of 1 mm, and a length of 350 mm.
Of heat pipe 61. This roller 60
The material of is iron material. Alcohol is used as the hydraulic fluid 61a.

A silicon rubber layer 62 having a thickness of 3 mm is formed on the surface of the heat pipe 61 where the paper passes (300 mm). The surface of the silinco rubber layer 62 is covered with a 30 μm PFA tube as a release layer.

The press roller 63 is an iron solid roller 6
2 is coated with a 3 mm silicone rubber layer and a 50 μm PFA tube. Press roller 63 has an outer diameter of 15 m
m and length 320 mm. The heating unit is a heating roller 60.
The ceramic heater 65 is brought into contact with the end portion of the to heat. A heat insulating material is used on the outside of the ceramic heater 65 to prevent heat from escaping.

The end portion of the heating roller 60 is heated by the heat given from the ceramic heater 65, the working liquid 61a inside is heated, and the heat flows to the low temperature portion to raise the temperature. The surface temperature of the heating roller 60 was set to 180 ° C. Since there is no heat source inside the roller, the diameter of the roller 60 can be reduced.

As in this embodiment, the roller diameter is φ1.
When the thickness is 5 mm, the nip width cannot be obtained without the rubber layer on the roller surface. When the heating roller 60 was not provided with a rubber layer, the nip width was 1.5 mm, but when the heating layer 60 was provided, the nip width was 3 mm, and good fixing properties could be obtained. .

Further, since the rubber layer has a heat capacity, heat for fixing can be stored. This makes it possible to deal with higher machine speeds. Although the ceramic heater 65 is used as the heat source this time, heat may be supplied from the end of the heating roller 60 by induction heating. Since the heat pipe itself uses a magnetic material, it can be heated. According to the present invention, it is possible to provide a fixing device in which the nip width can be increased even when a heat pipe having a small diameter is used and the temperature unevenness on the roller surface is small.

[0083]

As described above, according to the present invention, the heat transfer means for enclosing the heat medium is provided, and the heat medium is moved by the temperature difference on the surface of the heating roller. Therefore, the thermal conductivity of the heating roller can be improved. .

Therefore, it is possible to prevent the temperature unevenness on the surface of the heating roller from occurring, and to eliminate the temperature unevenness in the roller axis direction due to the difference in the size of the medium to be fixed, so that good fixing can be achieved. Further, the rise time of the heating roller can be shortened and the processing efficiency can be improved. Further, since the conductive wire material for heating the heating roller is provided outside the heating roller,
The diameter of the roller can be reduced and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a fixing device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a fixing device.

FIG. 3 is a side sectional view showing a heat pipe.

FIG. 4 is a front sectional view showing a heat pipe.

FIG. 5 is a perspective view showing a fixing device according to a second embodiment of the present invention.

FIG. 6 is a perspective view showing a fixing device according to a third embodiment of the present invention.

FIG. 7 is a front view showing a heating roller according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a state where a heating coil is inserted inside the heating roller.

FIG. 9 is a side sectional view showing a heating roller.

FIG. 10 is a perspective view showing a fixing device according to a fifth embodiment of the present invention.

FIG. 11 is a perspective view showing a fixing device according to a sixth embodiment of the present invention.

FIG. 12 is a perspective view showing a heating roller according to a seventh embodiment of the present invention.

FIG. 13 is a front view showing a heating roller according to an eighth embodiment of the present invention.

FIG. 14 is a perspective view showing a fixing device.

FIG. 15 is a perspective view showing a fixing device according to a ninth embodiment of the present invention.

FIG. 16 is a perspective view showing a heating roller according to a tenth embodiment of the present invention.

FIG. 17 is a side sectional view showing a heating roller according to an eleventh embodiment of the present invention.

FIG. 18 is a front sectional view showing a heating roller.

FIG. 19 is a perspective view showing a fixing device.

FIG. 20 is a perspective view showing a fixing device according to a twelfth embodiment of the invention.

FIG. 21 is a perspective view showing a heating roller according to a thirteenth embodiment of the present invention.

FIG. 22 is a side sectional view showing a fixing device according to a fourteenth embodiment of the present invention.

[Explanation of symbols]

P ... Fixed material 2, 21, 30, 35, 40, 43, 45, 52, 5
5, 60 ... Heating roller 3, 63 ... Pressure roller 11, 36 ... Hollow roller 45A ... Solid roller 4, 20, 31, 41, 42, 44, 47, 48, 5
1, 54, 56, 57 ... Conductive wire (induction heating means) 10, 37 ... Heat pipe (heat transfer means) 13 ... Water (heat medium)

Claims (12)

[Claims] 1. A heating roller for heating a material to be fixed, and a pressure roller for pressing the material to be fixed on the heating roller, wherein the heating roller comprises a hollow roller tube made of a magnetic material. An induction heating means for inducing the outer surface of the hollow roller tube by induction heating by applying a high frequency current to the outer surface of the hollow roller tube; A fixing device comprising: a heat transfer unit that is inserted into a hollow roller tube and moves the heat medium according to a temperature difference of the hollow roller tube. 2. The fixing wire according to claim 1, wherein the conductors are wired in parallel at a portion other than a contact portion between the heating roller and the fixing roller in a shape corresponding to the curvature of the heating roller. apparatus. 3. The fixing member according to claim 1, wherein the conductive wire is wired in a portion corresponding to a curvature of the heating roller except a contact portion between the heating roller and the fixing roller while being folded back. apparatus. 4. The conductive wire material comprises a plurality of coil-shaped conductive wires that are arranged opposite to each other in a portion other than the contact portion between the heating roller and the fixing roller along the axial direction of the heating roller. The fixing device according to item 1. 5. The fixing device according to claim 1, wherein the conductor wire is a litz wire formed by twisting a plurality of conductor wires. 6. A rubber layer is formed on the outside of the heating roller,
The fixing device according to any one of claims 1 to 5, wherein a resin layer is formed on the surface of the rubber layer. 7. A heating roller which heats a material to be fixed, and a pressure roller which presses the material to be fixed to the heating roller, wherein the heating roller comprises a hollow roller tube made of a magnetic material. An induction heating means for induction heating the hollow roller tube by applying a high frequency current to the conductive wire material, which has a coil-shaped conducting wire inserted into the hollow roller tube, and the hollow roller enclosing a heating medium. A fixing device, comprising: a heat transfer unit that is inserted into a thick portion of the tube and moves the heat medium according to a temperature difference of the hollow roller tube. 8. A heating roller that heats a material to be fixed, and a pressure roller that presses the material to be fixed to the heating roller, wherein the heating roller includes a hollow roller tube made of a magnetic material. An induction heating means for inducing the outer surface of the hollow roller tube by induction heating by applying a high frequency current to the outer surface of the hollow roller tube; A fixing device comprising: a heat transfer unit that is inserted into a thick portion of a hollow roller tube and moves the heat medium according to a temperature difference of the hollow roller tube. 9. A heating roller for heating a material to be fixed, and a pressure roller for pressing the material to be fixed to the heating roller, wherein the heating roller is a solid roller made of a magnetic material, An induction heating means for inducing heating of the outer surface of the solid roller by enclosing a heat medium by applying a high-frequency current to the outer surface of the solid roller is provided. And a heat transfer unit that is inserted into the solid roller and moves the heat medium according to the temperature difference of the solid roller. 10. A heating roller for heating a material to be fixed, and a pressure roller for pressing the material to be fixed on the heating roller, wherein the heating roller is a hermetic hollow roller made of a magnetic material. An induction heating unit that has a conducting wire member facing the outer surface of the hollow roller, and applies high-frequency current to the conducting wire material to induction-heat the outer surface of the hollow roller; A heat medium that moves according to the temperature difference of the hollow roller, and a fixing device. 11. The fixing device according to claim 10, wherein the surface layer of the heating roller is formed of a rubber layer. 12. A heating roller for heating a material to be fixed, and a pressure roller for pressing the material to be fixed on the heating roller, wherein the heating roller is a hermetic hollow roller made of a magnetic material. A rubber layer that covers the outer peripheral surface of the hollow roller excluding its one end side; heating means for heating the one end side of the hollow roller; and a sealing member enclosed in the hollow roller and heated by the heating means. Accordingly, the heat medium that moves in the axial direction of the hollow roller, and a fixing device.