JPH065427B2 - Fixing device - Google Patents

Description

The present invention relates to a heating device such as a fixing device or a heating and developing device provided in a recording device such as an electrophotographic device or an electrostatic recording device, and particularly when heat-treating an object to be fixed such as an unfixed image. Alternatively, the present invention relates to a heating device that uses heat generated by heating or a heating means around the heating device.

Conventionally, heating devices that use heat have been difficult to achieve uniform heating and power saving. In particular, in a heat roller fixing device which is a typical one of fixing devices, heat from a heat source provided in an image forming device or a fixing device is transferred to the heat roller surface and is lost without affecting fixing. There was a problem when I was told. As a result, heat loss is increased at the end of the heat roller, and the fixability is significantly reduced.

Therefore, conventionally, in order to compensate for the temperature drop in the end region of the end portion of the heat roller or the pressure roller that comes into pressure contact with the heat roller, the heat generation distribution of the heating source is configured to be strong in the end region. As the electric power consumption of the fixing device increases and the amount of heat lost from the end of the heat roller further increases, the temperature rises inside the image forming device, causing toner blocking in the cleaner and the developing device. This also causes various problems such as thermal deformation of plastic molded parts in the apparatus.

In order to reduce the heat loss as described above, a heat insulating sleeve or a slide bearing made of resin is provided between the frame member holding the roller and the heat roller, or a heat insulating material is interposed between the drive gear and the roller. Is known, but with the large heat loss transferred from the drive gear etc. to the main body, the edge temperature sag also occurs, and with +, good results are obtained during standby and single copy, but continuous paper feeding However, on the contrary, the temperature drop in the central portion was large and fixing failure occurred in the central portion.

On the other hand, an invention in which two heaters are provided in the fixing roller to shorten the rise time and only the high-power heater of the two heaters is used at the time of fixing is found in JP-A-58-130368. Although the present invention is an excellent invention, there is no mention of the above problems that occur during high-speed copying. Therefore, if continuous copying is performed at the end of the wait time according to the present invention, the temperature drop at the central portion is still large.

In other words, the fixing device has not been realized yet if the wait time can be shortened, the fixing property of high-speed fixing can be maintained, and thermal external damage can be prevented. Further, in the conventional general fixing device, there are cases where a fixing property is good under a certain environment under a certain condition but is completely different under another environment.

The present invention aims to improve the above-mentioned conventional drawbacks,
It is an object of the present invention to provide a heating device capable of performing a favorable heat treatment with a small amount of electric power, particularly a fixing device capable of obtaining a good fixing property in an image recording device.

Another object of the present invention is to provide a fixing device which can always obtain a uniform fixing property even in various copy modes and can effectively utilize limited electric power to achieve energy saving and shortening of the wait time. To provide.

Another object of the present invention is to provide a fixing device which achieves fixing with very little offset and very good image quality.

Another object of the present invention is to provide a high-quality fixing device that is free from wrinkles even in a high humidity environment and has no image shift even in a low humidity environment.

The features of the invention are set forth in the appended claims.

Hereinafter, the present invention will be described with reference to the drawings. A fixing device to which the present invention is particularly effective will be described in detail.

FIG. 1 is an explanatory diagram of an embodiment of the present invention. This figure shows a toner image T formed by an electrophotographic method by a heat fixing device.
Is fixed on the plain paper P.

Reference numeral 1 denotes a heating roller having two heaters 31 and 32 for heating such as a halogen heater therein, which receives a driving force from a driving motor (not shown) and rotates in an arrow direction.

The heater 31 is a high output heater as compared with the heater 32,
Maintain proper heating roller surface temperature during fixing and standby. Therefore, the heat generation distribution in the central portion is larger than that in both end portions. Further, the heater 32 is used at the time of waiting for a predetermined fixing temperature after the main switch is turned on (or it may be used when the set temperature rises at the standby time).
The rise time of the surface temperature of the heating roller is shortened.

This heating roller 1 comprises a hollow roller core 1a made of a metal such as aluminum, stainless steel or steel, and a polytetrafluoroethylene resin (PTFE) or a perfluoroalkoxy resin (PF
A heat-resistant resin layer such as A) and a heat-resistant elastic body layer 1b such as silicon rubber or fluorine rubber are provided in a predetermined thickness of 0.02 to 2 mm.

A pressure roller 2 having a heater 33 for low heating built therein is rotatably supported by bearings 15 and 15 '. This roller 2 is pressed against the heating roller 1 by a known pressing means at least at the time of fixing, and an elastic layer such as silicon rubber, fuso rubber or fluorosilicone rubber is relatively thickly provided on the outer peripheral surface of the metal roller core. It is a thing. This configuration is intended to secure a pressure contact area d with the heating roller. A temperature sensitive element 4 such as a thermistor or a thermocouple is arranged in contact with the outer peripheral surface of the heating roller 1, and a detection signal of the temperature sensitive element 4 is guided to a known control means (not shown) to control the temperature of the outer peripheral surface of the heating roller 1 ( The toner image melting temperature is maintained by controlling the output of the heaters 31 and 32, the applied voltage, or the like.

Reference numeral 6 denotes a cleaning member for removing foreign matter such as offset toner and paper dust adhered to the surface of the heating roller from the roller surface. The cleaning member 6 is made of heat resistant nonwoven fabric such as Nomex (registered trademark) or Himeron (registered trademark). 6 ₁ is used.

The cleaning web 6 ₁ is in contact with the heating roller by an elastic pressing roller 6 ₃ . The web 6 ₁ is driven by a take-up roller 6 ₅ (not shown).
It is pulled out from the supply roller 6 ₂ by a small amount so as to change its abutting position little by little, and the cleaning web 6
The new surface of ₁ contacts the heating roller. The web 6 ₁ moves on the roller 6 _{4 which} is interposed after the pressing roller 6 ₃ and is reversed to the supply roller 6 ₂ side, and is wound on the winding roller 6 with the front side and the back side reversed. Also cleaning web 6 ₁
The offset prevention liquid such as dimethyl silicone oil may be impregnated therein and the offset prevention liquid may be applied to the heating roller.

Reference numeral 7 denotes a curved reflecting plate having heat reflectivity, which is the heating roller 1.
Is provided in the entire longitudinal direction of the heating roller 1. The reflector 7 is arranged to cover the entire surface of the heating roller between the position and the entry opening of the paper P of the roller 6 ₃ Pushing the heating roller 1 the peripheral surface. Reference numeral 8 denotes a cover having a large thickness for preventing heat dissipation, which is provided in close contact with the entire convex surface of the reflector 7 to prevent wasteful heat dissipation from the reflector 7. That is, the reflector 7 and the cover 8 form a cover portion of the roller. Reference numeral 16 denotes a casing member on the upper side of the fixing device, which includes the cleaning member 6, the reflection plate 7, the cover 8,
It surrounds the temperature sensitive element 4. The temperature detector of the temperature sensitive element 4 is located on the roller 1 side of the reflector 7.

On the other hand, also on the pressure roller 2 side, a reflection plate 9 similar to the reflection plate 7 is provided.
Also, a cover 10 similar to the cover 8 is provided so as to cover most of the peripheral surface of the pressure roller 2.

By providing the reflection plates 7 and 9 and the covers 8 and 10, it is possible to reduce the heat wasted from the surfaces of the heating roller and the pressure roller, and to measure the temperature of the temperature sensing element 4. Can be stabilized. Further, it is possible to stabilize the temperature control of the heating roller 1 with respect to the set temperature and reduce the power consumption.

Reference numeral 22 denotes a guide plate for guiding the paper P to the heating roller 1 side, which is a reflection plate 7
And the reflecting plate 9 are provided close to the heating roller 1 so as to be located between the respective ends of the reflecting plate 9 and the reflecting plate 9. A support plate 24 supports the pressure roller, and the pressure roller is pressed against the fixing roller by the spring 23.

The plain paper P having the unfixed toner image T is nipped and conveyed between the heating and pressing rollers 1 and 2, and the toner image T is fixed on the paper surface as a permanent image by heat applied by the surface temperature of the rollers 1 and 2. Then, the sheet is ejected to the outside of the apparatus while being held by the sheet ejection rollers 20 and 21. On the discharge port side of the heating roller, a plurality of separating claws 5 are provided in contact with the roller surface along the roller axial direction in order to reliably separate the plain paper P from the heating roller.

Further, the separation claw 5 ₁ is also provided on the discharge port side of the pressure roller 2 to the roller 2
Is provided in contact with the surface of.

The separation claw 5 is separated from the casing member 16 by the support plate 1
8 and the separation claw 5 ₁ is also held by the support plate 18 ₁ which is separated from the casing member 17 below the fixing device.
The casing member 17 is provided so as to be separated from the reflection plate 9 and the cover 10 of the pressure roller 2 and cover them.

The reflection plates 7 and 9 are preferably made of a metal having a glossy surface, such as an aluminum plate having a polished surface, a steel plate, or an iron plate having a surface treatment such as Cr plating. Further, the reflectors 7 and 9 preferably have a curvature such that they are concentric with the roller peripheral surface, and the thickness thereof is preferably relatively thin.

The covers 8 and 10 are preferably composed of glass wool, rock wool, ceramic fiber, or foam such as phenol foam or epoxy foam, or a composite structure. The core metal of the heating roller 1 is grounded by the grounding member E.

Next, the configuration of the end portion of the heating roller 1 will be described in detail with reference to FIG. 2, which is an explanatory view of the fixing device showing the cross section XX ′ in FIG. The heater 32 is not shown in the figure.

11, 11 'rotational axis 11, one of the ends of each heating roller 1' in the refractory sleeve are respectively fitted to _1, the frame 1 of the fixing device
The bearings 12, 12 'respectively mounted on 3, 13' are in contact with each other. 14 and 14 'are heat resistant gears, heating roller 1
Are each fitted to the rotary shaft 1 _1, 1 _'1, it is transmitting a driving force from a drive source M. The heat resistant gear 14 ′ meshes with another drive transmission gear 25 and receives a driving force to rotate together with the heating roller 1. The heat-resistant gear 14 has a manual knob 26
The gear 26 ₁ is meshed and the manual driving force is transmitted.

Since the heat-resistant gears 14 and 14 'are made of a heat-insulating heat insulating material, heat may be dissipated from the heating roller 1 to drive transmission members such as other gears through the gears 14 and 14'. Absent. The heat retaining property of the heating roller 1 is improved by this gear.

Further, the heat-resistant sleeves 11 and 11 'are also heat-insulating heat insulating materials, and the end portions of the heating roller 1 to the bearings 12 and 12'.
And heat loss due to heat transfer to the frame bodies 13 and 13 'is prevented. Therefore, the heat loss from the end portion of the heating roller 1 can be greatly reduced by the heat resistant gears 14 and 14 ', and the heat loss is further increased by adding the heat resistant sleeves 11 and 11'. It could be reduced or almost eliminated.

In general, the heat resistant gears 14 and 14 'are often provided with a large number of other drive transmission members interlocked with each other. Therefore, the conventional heat loss occupies most in such a drive system. On the other hand, since the heat loss to the drive system can be reduced or eliminated in the case of the above embodiment, the thermal efficiency can be improved to a high degree and the power consumption can be reduced. In the above embodiment, in addition to the heat resistant gears 14 and 14 ', the heat resistant sleeves 11 and 14'
Since 11 'is used, the frame 13,13' from the roller end
The heat loss can be prevented and the thermal efficiency can be further improved. Although the above embodiment is provided at both ends of the heating roller 1, it is sufficient that at least a heat insulating portion is provided between the roller 1 and the side that receives the driving force of the member that transmits the driving force to the roller 1.

As the heat-resistant sleeve, a heat-shielding member such as polyimide, polyamide-imide, polyamide, PPS (polyphenylene sulfide), PBT (polybutylene terephthalate) resin, or phenol resin, or a mixture material of this kind And the like, which are made of a heat insulating material.

Further, the gears 14 and 14 'are preferably made of a heat-resistant material having a good heat insulating property such as polyimide, polyamideimide, PPS, modified phenol, and tetrafluoroethylene with a reinforcing filler. .

As described above, the heating roller 1 has the heat resistant sleeves 11 and 11 '.
And the heat resistant gears 14 and 14 ', the machine body and frame 13 and 13'
Therefore, they are thermally isolated from each other, and the heat loss transmitted through them is extremely small. In this way, the roller can be thermally isolated from the driving force transmission system path by any configuration other than the illustrated example. However, when the heating roller 1 is set in a thermal float state, the heating roller 1 is also in an electrically floating state. Therefore, the surface potential of the heating roller due to frictional charging due to rotation of both rollers and frictional charging between the copy paper and the roller is A phenomenon occurred in which the electric field increased as the copying was continued (at a potential of about several thousand V) and then sparked to the conductive part of the machine body.

In this case, noise is generated in the electric circuit, a malfunction of the machine occurs, and the potential of the heating roller becomes abnormally high, which causes scattering of the image, resulting in deterioration of copy quality. Therefore, if the core metal of the heating roller is grounded while electricity is applied, the surface potential of the heating roller is 300 V in absolute value at maximum.
Below, the above inconvenience has been resolved.

Further, the same effect was obtained by disposing a static elimination brush in contact with or in proximity to the surface of the heating roller in the longitudinal direction of the surface.

Further, in the present embodiment, the heat generation distribution of the high-power heater 31 among the heaters in the heating roller 1 is set to be large at the central portion of the roller and smaller at the end portions than the central portion, so that a small amount of electric power is required even in various copy modes. Therefore, it was possible to obtain a uniform and good fixing property. Further, by further roughening the inner surface of the fixing roller or by applying a black coating, the heat absorption effect was enhanced, so that a more stable fixing property could be obtained.

Next, a specific numerical example of the embodiment according to the present invention will be described.

In the fixing device having the above-described structure, the heating roller 1 has an outer diameter of φ59.4, an outer diameter of the central portion is φ59.3, and a heat-vulcanizing silicone rubber coating having a thickness of 7 mm of an aluminum core metal and a surface layer of 0.5 mm. As the pressure roller 2 and the inverted crown-shaped roller, a roller made of a stainless steel core having an outer diameter of φ60 and φ50 and having a thickness of 5 mm and coated with a heat-heating type silicone rubber was used.

An 800 W halogen heater is used for the high power heater 31 and a 500 W halogen heater is used for the low power heater 32 in the heating roller 1, and the heater 3 is used during the rising wait time.
By turning on 1,32 together, we achieved a reduction in wait time,
After that, the temperature of the fixing roller is controlled only by the high power heater 31.

The heater 33 in the pressure roller 2 is a 70 W sheath heater, and is turned on only at the time of copying.

Further, the nip width (= pressure contact area d) was 8 mm, and the heating roller surface temperature was 185 ° C.

FIG. 3 is a view for explaining a change diagram of the surface temperature of each roller with respect to time for the experiment of the above specific example. Time t = 0
When the power is turned on, the heaters 31, 32 and the heater 33 are turned on. The heating roller surface temperature rises as shown in the figure, and when the heating roller surface temperature reaches 150 ° C. (point A), both rollers 1 and 2 that have stopped rotate at pressure contact low speed (rotation slower than normal fixing speed). Initially, the surface temperature of the pressure roller also rises sharply.

When the surface temperature of the heating roller reaches 170 ° C. (point B), both rollers rotate 1 degree at high speed, and the electric potential on the photosensitive drum is controlled during that time, but the developing bias value and the voltage value of the exposure lamp become appropriate values. Controlled.

When the potential control ends, both rollers stop, but the heater
31,32,33 keep lighting up.

When the heating roller surface temperature reaches 185 ° C. (C
Point) Fixing is possible and the wait signal is released and copying is ready.

After that, the surface temperature of the heating roller is maintained at 185 ° C.
On the other hand, the surface temperature of the pressure roller 2 decreases because the heat supply from the fixing roller is stopped. After about 5 minutes from the fixable state (point D), the temperature of the pressure roller reaches its minimum, and then the temperature of the pressure roller gradually increases due to the heat of the heater 33 from the inside. Therefore, the fixing ability at the point D is the lowest. Therefore, continuous copying at the point D is extremely preferable as a comparative experiment of fixing property. In this figure, 100 at point C
The change in temperature when continuous copying is performed is shown including the end of 100 sheets (point E).

The experimental results shown below are based on the following common conditions between C and D. In other words, under a 10 ° C environment, a copy speed of 445 mm / sec (A3 size paper, 37 sheets / minute) and a weighing of 80 g / m ² Petacro of φ24 was formed on A3 paper.
1,2,3,5,7,10,15,20,30,40,50,100 from 0 copies
Twelve sheets in total were selected, and 9 points were set as the test objects for each sheet. This 12 sheets, each of 9 places, total of 108 places, was evaluated for fixing property by using Silbon Ctype (trade name, Kojin Co., Ltd., Silbon paper), rubbed 10 times with pressure of 40 g / cm ² , and before and after rubbing. The difference was measured by a Macbeth reflection densitometer and digitized.

Ie D: reflection density before rubbing φ24 petacro image (image density is adjusted so that 1.0 ≦ D ≦ 1.1) D ′: reflection density after rubbing φ24 petacro image ΔD: density Reduction rate Table 1 below shows the constitutional requirements of each fixing device.

In Table 1, the roller material marked "TF" is (NO.
I, NO.V fixing device) The outer diameter of the heating roller 1 is 59.4.
A roller having a reverse crown amount of 100 μ, an aluminum core metal having a wall thickness of 7 mm, and an outer peripheral surface coated with PFA (Teflon) having a thickness of 35 μ was used.

In addition, for those described as SI (fixing units NO.II to NO.IV), a roller having a thermally vulcanized silicone rubber coating on the outer peripheral surface was used instead of PFA. (Outer diameter φ59.4 Reverse crown amount 100μ).

A heater having a light emitting point as shown in FIGS. 4A to 4C was used. In the figure, a is a heater having a large heat generation amount at the end, which is effective for a fixing device in which heat is largely escaped from the end of the roller, b is a heater having a uniform heat generation over the entire length, and c is a heat loss from both ends. It is a heater with a large heat generation amount in the central portion, which is particularly effective for the fixing device of the present invention which holds down.

The presence or absence of heat insulation means that the heat roller is thermally floated by the heat resistant gear and the heat resistant sleeve made of a heat insulating material as described above.

When the gear made of metal is used and / or the roller shaft is directly contacted with the bearing without the heat-resistant sleeve as in the prior art, no heat insulation is performed.

Table 2 shows the result of the fixing property of each fixing device, and the numbers show how many places the density decrease rate is more than the predetermined (15,10,5)% (12 sheets × 9 places = 108 places). It is a thing.

As is clear from Table 2, a remarkable difference is seen between the fixing unit NO.I and the fixing unit NO.II.

This is the difference between the Teflon (registered trademark) roller and the silicone rubber roller (elastic roller), and it can be seen that the silicone rubber roller has a better fixing property. The reason is that when fixing an unfixed toner image that is electrostatically attracted to the copy paper unevenly, a roller close to a rigid body such as a Teflon roller applies pressure only to the toner of the convex portion and the pressure of the toner of the concave portion. It is thought that this is because fixing failure tends to occur without taking such a time. On the other hand, in the case of the silicone rubber roller, it is considered that the heat transfer effect to the toner is good because the uniform pressure is applied to the uneven toner image due to the elastic force of the rubber, and the fixing property is also good.

However, in the case of the fixing device No. II, wrinkles were generated up to the first few copies in the copy after standing in high humidity.

Wrinkles disappeared as the copying progressed, but wrinkles still occurred until the first few copies after standby again.

The wrinkles occur due to the following reasons. Since the heat radiation to the edge of the standby part is large, the temperature of the edge is lower than that of the center (180 ° C at the center, 163 ° C at the edge of the width of the sheet). Since it becomes a drum shape (the diameter of the central portion becomes larger than that of the end portion), it occurs because the copy paper absorbs moisture and wavy under high humidity. Then, it is considered that the reason why the paper is cured by continuous sheet feeding is that the temperature of the roller end side rises and the roller becomes a drum shape (inverse crown shape) because the heater with strong heat generation at the end almost lights up. Therefore, in order to prevent the wrinkles, it is necessary to further increase the heat generation at the end portion as compared with the central portion, but the heat escape from the end portion is further increased, which is a wasteful effort.

There is also a significant difference between the fixing unit No. 2 and the fixing unit No. 3. This is an effect when the heating roller is insulated.

With the configuration of No. 3 fixing device, the density decrease rate is 10% or more.
All points were in the center. This is because heat is not released from the edge part due to heat insulation, so the thermal expansion on the edge side is large as the copying progresses and the edge diameter is larger than the central part, so the pressure distribution between both rollers is also end. This is because the parts become higher and the central part becomes less stable. Therefore, it was fixing device No. IV that conducted a paper passing test by making the heat generation distribution of the heater stronger in the central part, and very good results were obtained.

Here, the heat generation length of the heater is preferably approximately the same as or shorter than the maximum sheet passing width.

If the heat generation length of the heater is too long, it is milder than that of the NO.III fixing device, but the fixing property in the central part tends to be weak.

Next, No. V using a Teflon (registered trademark) coat fixing roller instead of the silicone rubber fixing roller of the NO.IV fixing device
In the fixing device, the above-mentioned essential difference in fixing property between the silicone rubber and the Teflon (registered trademark) coated roller can be seen. However, according to the constitution of the present invention, the Teflon (registered trademark) coated roller has a very good result. was gotten. Fixer
In the configurations of NO.III to NO.V, the temperature distribution in the roller axis direction during standby is very uniform at 185 ± 0.5 ° C within the sheet passing width (within the range of 297 mm), and in single copy. Even in the high humidity (32.5 ° C, 90%), no wrinkles were formed on the copy paper.

On the other hand, in the NO.I and NO.II fixing devices, as described above, the first few to several tens of sheets after the stand-by, the vertical wrinkles (wrinkles that run substantially parallel to the paper transport direction) occurred. .

In addition, wrinkles tended to occur more easily on the silicone rubber roller than on the Teflon (registered trademark) roller.

Then, the image shift was examined under low humidity (15 ° C., 15%). Image misalignment is more noticeable when the peripheral speed of the roller is too fast in the peripheral area compared to the central area, and the image in the peripheral area on the trailing edge of the copy paper is disturbed. Wrinkles that run at a right angle) occur. Fixer No. I, II, III
In this case, image misalignment occurred after continuous copying, and horizontal wrinkling occurred more and more when continuous copying was performed. This is because the fixing devices I and II use the heater a whose heat generation amount in the peripheral portion is larger than that in the central portion. And as a result, both ends of the pressure roller receive more heat than the center,
Due to the large thermal expansion, image shift and horizontal wrinkles are generated for the above reason. Also in the fixing device III, when the continuous paper feeding is performed as in the case of I and II, the heat escape from both ends is very small, and the temperature of the fixing roller on both ends rises higher than the central part. , Image misalignment occurred. On the other hand, in the fixing devices IV and V of the present invention, since the temperature distribution in the axial direction of the fixing roller was very uniform in any copy, no image deviation occurred.

Table 2 shows a summary of the above results.

It can be seen from Table 2 that the fixing device I is very problematic in terms of fixability, wrinkles on the first few sheets after standing by standby, and image misalignment during continuous paper feeding.

Next, in the fixing device II, it is found that there are problems in the fixability in continuous paper feeding, the first several wrinkles after standing by standby, and the image shift in continuous paper feeding. Next fixer
In the case of III, a considerable improvement can be seen, but it is understood that there are problems in the fixability in continuous paper feeding (particularly in the central portion as described above) and the image misalignment in continuous paper feeding.

Next, in the fixing device IV, very good results were obtained in all respects, and there was almost no curl on the copy paper, which was very effective for double-sided copying. Next, in the fixing device V, the fixing property in continuous paper feeding is slightly weak,
Next, it was within the range of practical use, and other than that, very good results were obtained.

As described above, according to the present invention, the heating distribution characteristic of the high power heating member of the two heating members of the fixing roller has a configuration in which the central portion of the roller is higher than both end portions, so that it is possible to cope with environmental changes. It is possible to achieve a special effect that has not been seen in the past, that has sufficient correction power and can maintain sufficient fixing property even in continuous fixing.

As the heating member of the present invention, a PTC ceramic or the like can be applied in addition to the heater lamp.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 is an explanatory view of a cross section in the roller axial direction of FIG. 1, FIG. 3 is an explanatory view showing changes of surface temperatures of respective rollers in a copying process, and FIG. The figure is an illustration of an example of a heater. 1 is a heating roller 2 is a pressure roller 31,32,33 is a heater

Continuation of the front page (56) Reference JP-A-57-63570 (JP, A) JP-A-58-129450 (JP, A) JP-A-58-130368 (JP, A) JP-A-59-46666 (JP , A) Actual opening Sho 49-126450 (JP, U) Actual opening Sho 58-23356 (JP, U) Actual opening Sho 55-84650 (JP, U) Actual opening Sho 56-145061 (JP, U) Actual opening Sho 57-6020 (JP, Y2) U.S. Pat. No. 4,015,545 (US, A) JP-A-60-83977 (JP, A) JP-A-53-17740 (JP, A) JP-A-55-146858 (JP, A) Actual opening 56-10653 (JP, U) Actual opening 56-70996 (JP, U) Actual opening 57-70058 (JP, U) Actual opening 59-9370 (JP, U) Actual opening 58-128435 (JP, U)

Claims (1)

[Claims] 1. A first heating member having a first heating member having a larger heat distribution in the central portion than both end sides, a first rotating member having a second heating member of lower electric power than the first heating member, and the first rotating member. An adiabatic support member for heat-insulating and supporting the first rotating body, a drive means for driving the first rotating body and having a heat-shielding member in the drive transmission path, and a first means when rising.
Both the heating member and the second heating member are energized, and when fixing, the first
An energization control unit that energizes only the heating member, and the heat flow from the central portion to both end sides of the first rotating body during fixing is blocked by the heat insulating support member and the heat insulating member so that the central portion to the end portion. A fixing device that is characterized by achieving high fixing performance.