JPH0625894B2 - Fixing device - Google Patents

Description

The present invention relates to a fixing device that fixes an unfixed object to be fixed onto a support material. Preferably, the present invention relates to a fixing device having a fixing rotating member pair such as a roller or a belt for fixing an unfixed toner image on a recording material.

Conventionally, a fixing device has been used in an image forming apparatus such as a printer, a copying machine, a facsimile machine or the like, and is also applied to various devices for fixing an object to be fixed on a support material.

Conventionally, in this fixing device, in order to prevent offset that toner detached from the recording material adheres to the surface of the fixing roller on the side that comes into contact with the unfixed toner image, silicone oil is applied or the surface material of the fixing roller is releasable. Was made into a superior material.

However, when toner adheres to the pressure roller surface so much that offset on the surface of the fixing roller is prevented, the roller surface is contaminated, and the toner on the surface of the pressure roller is opposite to the surface of the recording material opposite to the toner image supporting surface. It will be reset again (hereinafter referred to as back stain).

In the past, rather than solving such problems, the surface energy relationship was set so as to positively offset the toner on the pressure roller surface, or the cleaning roller was brought into contact with the surface of the pressure roller. I was cleaning it.

However, in such a solution, the back toner of the recording material is smeared by the offset toner on the surface of the pressure roller during the fixing process after the rest, and the recording material itself is deteriorated.

In particular, if an elastic body is used at least on the surface of the pressure roller and the configuration described above is adopted, the fixability and the image quality are improved, but the roller is easily contaminated with toner due to durable use, and the toner is not once attached to the roller surface. Once attached, it is difficult to remove with normal cleaning means. In addition, once the toner adheres to the surface of the pressure roller, the offset toner on the surface of the pressure roller rapidly increases due to the affinity between the adhered toner and the toner on the recording paper. This causes jams and various troubles.

Further, recently, an apparatus for forming an image on both sides of a recording material has been put into practical use, and a fixing device in this apparatus is
The pressure roller contacts one side of the recording material that has once been fixed.
In this way, if you touch one side of the recording material that has been once fixed,
There is a high possibility that toner will be offset on the surface of the pressure roller, and the problem was a major problem in practical use.

Further, the above problems are more serious in the case of performing heat fixing than in the case of using the pressure fixing method as the fixing method.

A so-called fluorine-based resin coating roller such as PTFE (polytetrafluoroethylene) or PFA (perfluoroalkoxy) is used as the fixing roller, and an elastic body coating of silicon rubber, fluorine rubber EPDM, hydrin rubber, fluorosilicone rubber, etc. is used as the pressure roller. A system using a roller, and a fixing roller which is usually equipped with a heater inside the roller and has an elastic surface, has no choice but to reduce the thickness of the elastic body in terms of heat conduction. When a cleaning member such as a blade or a cleaning roller is brought into contact with a strong pressure, the elastic body is damaged or a problem occurs in terms of durability.

On the other hand, when the pressure roller is contaminated with the toner, the contaminated toner is softened at the nip portion where the heating roller and the pressure roller are in pressure contact with each other during the stand-by pause, and as a result, the recording material after the rest pauses. There was a problem that toner was stained on the back surface of the sheet and the recording material was wound around the pressure roller.

In view of the above points, the present invention provides an apparatus capable of solving these problems, and has a simple structure based on a technical idea different from the conventional one, prevents back stain of the recording material, and prolongs the life of the roller. However, another object of the present invention is to provide a fixing device capable of maintaining the fixing performance for a long period of time.

The present invention is different from the conventional one, in a fixing device having a fixing roller heated by a heater and having a silicone rubber surface layer, and a pressure roller having a silicon rubber surface layer in pressure contact with the fixing roller. The silicone rubber having a vulcanization temperature lower than that of the surface of the fixing roller is used, and the cleaning member is provided only on the surface of the fixing roller.

An embodiment of a fixing device according to the present invention will be described below with reference to the drawings.

FIG. 1 illustrates an embodiment of a particularly effective double-sided recording apparatus among image forming apparatuses to which the present invention is applied.
In this example, since the recording material is moved in the predetermined transport direction,
It has means for changing the position of the conveying member. The conveying direction is a recording material conveying path or a recording material holding portion for selectively forming a single image or a plurality of images, and the position conversion means is arranged to change the image in accordance with the mode selection of the image. It is configured to displace the rotating body so as to convey the recording material in a desired direction.

Further, in the embodiment, the position conversion means is configured to move the recording material guide means in accordance with the position conversion of the rotating body.

FIG. 1 shows a copying machine for performing single-sided, double-sided and multiplex copying according to an embodiment of the present invention. In the figure, 27 is a photosensitive drum, 39 is a recording material supply table, 33 is a fixing device, 34 is a reversing device for reversing recording materials for double-sided image formation, and 35 is a conveying path for multiple image formation. In this copying apparatus, the recording material sent from the recording material supply table 39 is a toner image formed on the photosensitive drum 27 by a known cleaning unit 30, a charger 29, an image exposure by an optical system 28, and a developing unit 32. Transfer means 31
Then, it is transferred from the fixing device 33. The recording material sent from the fixing device 33 is
It is sent in the direction indicated by A in FIG. 1 and carried out of the machine. In the case of double-sided copying, the paper is sent in the direction indicated by B in FIG. 1 and sent to the reversing device 34, and then the direction is reversed from the reversing device 34 and sent out by the roller 36, and again the photosensitive drum 27.
The toner image is transferred to the back side, is fixed by the fixing device 33, and is then carried out of the apparatus. In the case of multiple copying, the recording material is fed in the direction indicated by C in FIG.
The toner image is again sent to the photosensitive drum 27 through the conveying path 35, the toner images are duplicated, and thereafter, the toner image is similarly sent out of the apparatus through the fixing device 33.

As described above, in order to feed the recording material from the fixing device 33 in any one of the directions A, B, and C, the first and second rotating bodies that sandwich and convey the recording material, and the first and second rotating bodies. Recording material guide means provided around the second rotating body and position converting means (not shown) for displacing at least one of the first and second rotating bodies are provided. However, the above-described conveyance direction is a recording material conveyance path or a recording material holding portion for selectively forming a single image or a plurality of images, that is, in the example shown in FIG. 1, a single image is formed. The recording material conveying path for the recording material A, the recording material holding portion for forming the double-sided image in the direction B, and the recording material conveying path for forming the multiple images in the direction C. The position changing means is configured to displace the rotating body so as to convey the recording material in a desired direction according to the mode selection of the image. In the embodiment shown in FIG. 1, these first and second rotating bodies are composed of a pair of conveying rollers 37 and 38 which are capable of displacing the position of the other roller with respect to one roller as shown by the broken line.

FIG. 2 shows an embodiment of the fixing device according to the present invention. This drawing shows that the toner image T formed by the electrophotographic method is fixed on the plain paper P by the heat fixing device.

Reference numeral 1 denotes a heating roller as a fixing roller which has a heater 3 for heating such as a halogen heater therein and is in contact with the unfixed toner image T. The heating roller 1 receives a driving force from a driving motor (not shown) and is in an arrow direction. Rotate to. Reference numeral 2 denotes a pressure roller having a heater 3'for low heating built therein, which is brought into pressure contact with the heating roller 1 to rotate by rubbing.

This heating roller 1 comprises an HTV as a surface layer on the outer peripheral surface of a metal hollow roller core 1a made of aluminum, stainless steel, copper or the like.
(Thermal vulcanization type) Made of any one of silicone rubber, fluorine rubber, fluorosilicone rubber, etc. (a little inferior to the elastic layer 2b of the pressure roller 2 described later in terms of releasability) Comparison A thin elastic layer 1b is provided.

The pressure roller 2 is rotatably supported by a bearing described later. The pressure roller 2 is brought into pressure contact with the heating roller 1 by a known pressure means at least at the time of fixing, and an RTV (room temperature vulcanizing type) as a surface layer on the outer peripheral surface of the hollow metal roller core 2a.
It is made of any member such as silicone rubber or LTV (low temperature vulcanization type) silicone rubber (the elastic layer 1b of the fixing roller 1).
It is provided with a relatively thick elastic body layer 2b, which is superior in releasability to that.

Among the above materials, a preferable combination (a particularly effective one) is an HTV as a fixing roller (heating roller in this example).
The best combination is to use silicone rubber and LTV silicone rubber as the pressure roller. Next, the pressure roller with RTV silicone rubber surface layer is better than the fixing roller with HTV silicone rubber surface layer.

These combinations have the strength to maintain the fixing property, and are more opposite to the surface of the recording material supporting the unfixed toner image than the surface releasability of the fixing roller in contact with the unfixed toner image. It is a combination that the surface release property of the pressure roller in contact with the surface is better, specifically, the silicone rubber of the surface layer of the pressure roller has a lower vulcanization temperature than the silicone rubber of the surface layer of the fixing roller. Is a combination using.

The purpose of this structure is to secure a pressure contact area d (nip) with the heating roller 1. 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 ( Output of heater 3,
Alternatively, the toner image melting temperature is maintained by controlling the applied voltage or the like.

Reference numeral 6 denotes an offset preventing liquid application member which also serves as a cleaning member for removing foreign matters such as offset toner and paper dust adhered to the surface of the heating roller from the roller surface. Nomex (registered trademark) and Himeron (registered trademark) A heat-resistant web 6a made of, for example, is impregnated with any of the offset prevention liquids such as dimethyl silicone oil, methylphenyl silicone oil, fluorosilicone oil, amino-modified silicone oil and the like.

The cleaning web 6a is an elastic pressing roller.
6c is in contact with the heating roller. Also, this web 6a
Is moved so as to slightly change its contact position from the supply roller 6b by a take-up roller 6e (not shown) which is driven, and a new surface of the cleaning web 6a always contacts the heating roller 1. This web 6a moves on a roller 6d which is interposed after the pressing roller 6c, is reversed to the supply roller 6b side, and is wound up by the winding roller 6e in a state where the front side and the back side are reversed.

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. Further, the reflection plate 7 has such a width as to cover the position of the pressing roller 6c on the peripheral surface of the heating roller 1 and the entrance of the paper P. 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. 16 is a casing member on the upper side of the fixing device, which is a cleaning member 6.
It surrounds the reflector 7, the cover 8 and 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.
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 reflectors 7 and 9 and the covers 8 and 10, it is possible to reduce wasteful heat from the surfaces of the heating roller and the pressure roller, and to measure the temperature of the temperature sensitive 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 is a guide plate for guiding the paper P to the heating roller 1 side, and the heating roller 1 is positioned so as to be located between one end of each of the reflection plate 7 and the reflection plate 9.
Is provided close to. A support plate 24 supports the pressure roller, and the pressure roller is pressed against the heating roller 1 by a spring 23.

Now, 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 by the heat applied by the surface temperature of the rollers 1 and 2, and thereafter. The paper is ejected to the outside of the apparatus while being held by the paper ejection rollers 20 and 21. On the discharge port side of the heating roller, a plurality of separating claws 5a are provided in contact with the roller surface along the roller axial direction in order to surely separate the plain paper P from the heating roller.

A separating claw 5b is also provided on the discharge port side of the pressure roller 2 in contact with the surface of the roller 2.

The separation claw 5a is a support plate 18a that is separated from the casing member 16.
The separation claw 5b is also held by the casing member under the fixing device.
It is held by a support plate 18b which is separated from the support plate 17. The casing member 17 is provided so as to be separated from the reflecting 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 or copper plate having a polished surface 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 made of glass wool, rock wool, ceramic fiber, or foam material such as phenol foam or epoxy foam, or a composite structure.

Next, the configuration of the end portion of the heating roller 1 will be described in detail with reference to FIG. 3, which is an explanatory view of the fixing device showing the section XX ′ in FIG.

Reference numerals 11a and 11b denote heat-resistant sleeves respectively fitted to the rotary shafts 1c and 1d at both ends of the heating roller 1, respectively.
The bearings 12a and 12b respectively mounted on a and 13b are in contact with each other. Heat-resistant rollers 14a and 14b are heat-resistant gears.
Are fitted to the rotary shafts 1c and 1d, respectively, and the driving force from the driving source M is transmitted. One heat-resistant gear 14b meshes with another drive transmission gear 25, and receives a driving force to rotate together with the heating roller 1. The other heat-resistant gear 14a has a manual knob 26
The gear 26a is meshed with and the manual driving force is transmitted.

Since the heat-resistant gears 14a, 14b are made of a heat-insulating heat insulating material, the heat-resistant gears 14a, 1b
Heat is not dissipated to the drive transmission member such as another gear via 4b. The heat retaining property of the heating roller 1 is improved by this gear.

Further, the heat resistant sleeves 11a and 11b are also heat insulating heat insulating materials, and from the end of the heating roller 1 to the bearings 12a and 12b.
Also, heat loss due to heat transfer to the frames 13a and 13b is prevented. Therefore, the heat loss from the end of the heating roller 1 can be reduced by the heat resistant gears 14a and 14b as compared with the conventional case.
In addition, the addition of heat resistant sleeves 11a and 11b has made it possible to greatly reduce the number of the sleeves or to eliminate them altogether.

Generally, the heat resistant gears 14a and 14b 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 addition, in the above embodiment, in addition to the heat resistant gears 14a and 14b, the heat resistant sleeve 11
Since a and 11b are used, the frame bodies 13a and 1 from the roller end are
The heat loss to 3b can be prevented and the thermal efficiency can be further improved. The above example is provided at both ends of the heating roller 1, but it is effective if at least a heat insulating portion is provided between the heating roller 1 and the side that receives the driving force of the member that transmits the driving force to the heating roller 1. is there. The heat-resistant sleeves 12a and 12b may be heat-insulating members such as polyimide, polyamide-imide, polyamide, PPS (polyphenylene sulfide), PBT (polybutylene terephthalate) resin, and phenol resin, or the like. A material composed of a heat insulating material composed of a mixed material is preferable. Also, the heat resistant gear 14
As a and 14b, polyimide, polyamide-imide, PPS
It is preferable to use a heat-resistant material having a good heat-shielding property such as a modified phenol or a tetrafluoroethylene to which a reinforcing filler is added.

As described above, the heating roller 1 includes the heat resistant sleeves 11a and 11a.
b and the heat-resistant gears 14a and 14b, the machine body and frame 13
From a and 13b, it becomes a thermally isolated state, and the heat loss transmitted through these becomes very small.

In the case of the above configuration, the thermal efficiency is very high, and even in the non-continuous copying, the good fixing property is obtained, but when the continuous copying is performed, the fixing property in the central portion of the copy paper is larger than that in the peripheral portion of the copy paper. The fixing property of No. 1 becomes weaker, and this becomes more remarkable as the number of continuously passed sheets increases.

The following two points are listed as the above reasons. The first reason is that the temperatures of the central portions of both the heating roller 1 and the pressure roller 2 decrease as the copy paper draws heat. On the other hand, at both roller end portions, the heat transfer to the copy paper is smaller than at the central portion, so the temperature drop at both roller end portions is smaller than the central portion temperature drop. That is, the roller surface temperature is higher at both roller ends. Secondly, because of the first reason, the pressure roller 2 receives more heat from the heating roller 1 on the end side than on the central portion, so that the temperature of the pressure roller 2 is also on the end side from the central portion. This is because the pressure roller 2 thermally expands in an inverted crown shape, and the pressure contact force of both rollers is higher on the end side.

Therefore, as for the heat generation distribution of the heater 3 in the heating roller 1, it is preferable to use one in which the heat generation amount in the central portion is larger than that in the end portions. The heat generation length of the heater 3 is preferably equal to or shorter than the width of the maximum sheet passing size. For example, when the heater shown in FIG. 3 is used, a uniform and good fixing property can be always obtained in both non-continuous copying and continuous copying.

In addition, good results were obtained even when using a uniform winding heater or a heater whose heat generation length is shorter than the width of the maximum paper passing size by about 10 to 60 mm.

(Embodiment 1) In the fixing device having the above-mentioned configuration, the heating roller 1 has a hollow roller core 1a, an aluminum core metal thickness of 6.5 mm, and an elastic layer 1b.
As an example, a 0.5mm thick HTV (heat vulcanization type) silicone rubber coating (Toshiba Silicon Co., Ltd .: product code TSE 220-6U) was used (end) with an outer crown diameter of 60φ (diameter at the center) Is a roller smaller than the end by 150 μ), the pressure roller 2 is a metal roller core 2a, and the outer diameter is 50 mm.
LTV with a thickness of 5 mm as the elastic layer 2b on the iron core of φ
(Low temperature vulcanization type) A roller having an outer diameter of 60φ using a silicon rubber coating (manufactured by Shin-Etsu Chemical Co., Ltd .: product code, KE-1202 modified to facilitate injection molding) was used. The heating roller 1 was manufactured by press molding, and the pressure roller 2 was manufactured by LIM (liquid injection molding).

A 650 W halogen heater is used as the heater 3 in the heating roller 1, a roller surface temperature is detected using a thermistor as the temperature sensitive element 4, and the heater is turned on by a control circuit (not shown).
The surface temperature of the heating roller 1 is constantly maintained at 170 ° C. by turning it off.

The copy paper processing speed of the fixing device is 40 mm / sec and 60 sheets / minute for A4 size paper. Web 6a of cleaning member 6
Is impregnated with dimethyl silicone oil (manufactured by Shin-Etsu Chemical: product code, KF 96 H, viscosity at 25 ° C 10,000 CPS), and the web 6a is gradually moved during copying, so that A4 size 1 is applied to the surface of the heating roller 1. 1 x 10 per sheet
-Paper was passed while applying ⁴ g of silicone oil.

A toner image was placed on 15% of the total area of A4 size paper and 100,000 sheets were continuously fed, but there was no jam. Also,
The minute amount of the offset toner to the heating roller 1 was all transferred to the web 6a and the next paper, and the heating roller 1 after passing 100,000 sheets was very clean. on the other hand,
Since the pressure roller 2 is made of a material having better releasability than the heating roller 11, there is no stain.

(Example 2) The same conditions as in Example 1 were used except that HTV silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd .: product code, KE 1406) was used as the heating roller 1. Even after passing 100,000 sheets, as in Example 1,
Both rollers had no roller stains and were able to pass paper.

(Comparative Example 1) As a heating roller, HTV silicone rubber (manufactured by Toshiba Silicone Company: product code, ISE 220-6U) As a pressure roller, HTV silicone rubber (manufactured by Shin-Etsu Chemical Co .: product code, K)
The same conditions as in Example 1 were used except that E 7424) was used.
After the passage of about 30,000 sheets, the entire pressure roller began to be contaminated with toner, and after the passage of 100,000 sheets, the pressure roller became black with the toner. When copying was done after leaving it in that state for 10 minutes in standby, the back smear occurred on the copy paper at the roller cycle.

It was found that the toner in the nip portion was softened and melted during the stand-by period, and the toner adhered to the back surface of the copy paper in a black band shape. Depending on the timing, the copy paper may adhere to the pressure roller due to the softening toner, and jam may occur. Therefore, it is necessary to clean the pressure roller once every 30,000 sheets. The stains on the pressure roller were very difficult to remove.

(Comparative Example 2) The same conditions as in Example 1 were used except that LTV silicon rubber (manufactured by Shin-Etsu Chemical Co., Ltd .: product code, KE-1202) was used for both the heating roller and the pressure roller. After passing about 20,000 sheets, the heating roller was damaged by the separating claw that was in contact with the heating roller.

Although the contact pressure of the separation claw was reduced and the paper was passed again, a light pressure such that the roller was not damaged resulted in incomplete separation of the passed paper from the heating roller, often causing a jam. Even when the heating roller was made of RTV silicone rubber, the roller was damaged.

As a result of passing through various combinations, HTV silicone rubber (organic peroxide vulcanization), fusso rubber, and fluorosilicone rubber, which have excellent strength, are suitable for the elastic layer 1b of the heating roller 1 which is a relatively thin coating layer. In addition, as the elastic layer 2a of the relatively thick coating layer of the pressure roller 2, LT having excellent releasability is used.
V silicone rubber (addition reaction type) and RTV silicone rubber (condensation polymerization type) are suitable, and very good results were obtained when the offset prevention liquid was applied from the heating roller 1 side.

As described above, in the particularly preferred embodiment of the present invention, in the fixing device for fixing by using the heat roller, the surface layer of the heating roller is composed of an elastic member having a lower releasability than the surface layer of the elastic body of the pressure roller, Further, by applying the offset preventing liquid to the heating roller, the offset of the toner to the roller does not occur even when the paper is excessively passed, so that the copy having the good fixing property and the good image quality can be performed. Further, since the roller is not contaminated with the toner, the fixing device itself can be easily maintained.

The above embodiment is an example of a heat fixing device, and the present invention is extremely effective and highly effective, but the present invention is also applicable to a pressure fixing device.

Further, in the above embodiment, the elastic layer such as a rubber material is thinly formed on the surface layer of the heating roller as the fixing roller, and the effect of the present invention can be extremely excellently achieved. It does not necessarily have to have a surface. The present invention exhibits particularly excellent offset prevention and durability when the pressure roller has an elastic surface layer.

Further, in the above-mentioned embodiment, the offset prevention liquid is applied to the surface of the heating roller as the fixing roller, but since the offset prevention liquid is supplied to the surface of the fixing roller more than that of the pressure roller surface by this, it is The balance of the releasability of the pressure roller and dust also prevent offset on the surface of the fixing roller as well as the pressure roller, and even if there is offset toner, there is a very small amount (to the extent that it cannot be visually confirmed). Since it is supported by the surface of the recording material, the offset phenomenon hardly occurs as a result. Applying the offset prevention liquid to the surface of the fixing roller in this way produces an effect different from the conventional one.

In the above-described embodiment, a member (including a felt and the like) for performing cleaning and offset preventing liquid is provided on the surface of the fixing roller, but these functions may be divided into separate members.

As described above in detail, according to the present invention, the releasability of the pressure roller surface is made better than the releasability of the fixing roller surface in contact with the object to be fixed such as the toner image. It is possible to prevent back stain, which is a major problem, and can keep the surface of the pressure roller in a cleaning state for a long period of time.

[Brief description of drawings]

FIG. 1 is an explanatory view of an example of a double-sided image forming apparatus in which the present invention can be particularly effectively implemented, FIG. 2 is an explanatory view of an embodiment of a fixing device according to the present invention, and FIG. 3 is an X- line in FIG. FIG. 4 is an explanatory view showing a heat generation distribution of the heater, which is a partial sectional view taken along the line X '. 1 ... Heating roller, 1a ... Metal hollow roller core 1b ... Elastic layer, 2 ... Pressure roller 2a ... Metal roller core, 2b ... Elastic layer 3, 3 ... Heater, 4 ... … Temperature sensitive elements 5a, 5b …… Separating claws, 6 …… Cleaning members 11a, 11b …… Heat resistant sleeve

 ─────────────────────────────────────────────────── --- Continued from the front page (56) References JP-A-56-132366 (JP, A) JP-A-56-77874 (JP, A) JP-A-56-17108 (JP, A) JP-A-55- 74824 (JP, A) JP 55-106481 (JP, A) JP 53-120536 (JP, A) JP 54-17033 (JP, A) JP 58-90675 (JP, A) JP-A-59-168472 (JP, A)

Claims (1)

[Claims] 1. A fixing device comprising: a fixing roller heated by a heater and having a silicon rubber surface layer; and a pressure roller having a silicon rubber surface layer in pressure contact with the fixing roller. A fixing device characterized in that a silicone rubber having a vulcanization temperature lower than that of the surface of the fixing roller is used, and a cleaning member is provided only on the surface of the fixing roller.