JPS59168472A - Surface layer attachment type roller body for fixation - Google Patents

Abstract

PURPOSE:To hold an elastic surface layer securely during fixation and improve fixing performance by providing a holding means which locks the elastic surface layer which is attachable to and detachable from a roller body. CONSTITUTION:The fixing roller 1 uses a core material formed by coating an aluminum hollow mandrel 12 adhesively with a silicone rubber sheet 14 and grinding its surface roughly and also has a heat-resistant coating 15 with the property of separation by fitting a silicone rubber tube which has an internal diameter a little bit smaller than the core material around the core material detachably. Contacting surfaces of the sheet 14 of the core material of the fixing roller 1 and the heat-resistant coating 15 with the property of separation are both made of silicone rubber, and have high coefficients of friction, so a shift between the roller core material and surface coating hardly occurs. Consequently, the surface layer is held securely during fixation and the fixing performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface layer-attached fixing roller body used in a novel roller configuration that has never existed before.

In particular, the present invention also relates to a fixing roller that is often used in image forming apparatuses.

In general, rollers have limited elastic claws and characteristics depending on the application, so the range of materials that can be used is extremely limited, and many problems have arisen in manufacturing and use.

This roller
It is often used as a presser roller or fixing roller in facsimiles, etc.). In a fixing device of an image forming apparatus, an unfixed image formed on a recording material using a powder or liquid developer is heated, pressurized, or heated and pressurized, and therefore the material for the fixing roller is subject to significant limitations.

Furthermore, the surface of the fixing roller needs to have releasability so that objects to be fixed such as developer forming an unfixed image do not adhere thereto. However, since adhesion of the fixing object cannot be completely prevented, a cleaning member that cleans the surface of the fixing roller, a separation claw that separates the recording material, and the like are brought into contact with the surface. These abutting members rub the surface of the fixing roller, causing problems such as scratches on the roller surface, performance deterioration, and staining of the recording material during fixing. Furthermore, if a contact type temperature sensing element is used for a roller whose temperature is controlled such as a heated fixing roller, this problem not only increases, but also various problems due to poor fixing or abnormal temperature rise, or a decrease in the durability of the sensing element itself. I woke up and got t/λ.

If the fixing roller that has deteriorated in this way is used any longer, it will cause problems in image formation, so it is replaced with a new fixing roller.

Generally, the fixing roller has a large diameter in order to form a predetermined pressure contact area for fixing, and is expensive because it is made of a large number of materials.

In addition, replacement is often required several times or even dozens of times during the life of the image forming apparatus main body, which imposes a heavy burden on the user.

However, even though only the surface of a deteriorated fixing roller has deteriorated, the roller itself is a fixed integral type, so the entire roller must be replaced.

Therefore, the cost of materials required for replacement is not only extremely high, but also a waste of resources.

In order to solve this problem, it is conceivable to polish the surface of the fixing roller and reuse it, but this would cause variations in the diameter of the roller, which would change the fixing performance, making it unsuitable for practical use.

The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and by attaching a removable elastic surface layer to the main body, it saves materials and costs when replacing the roller, and satisfies the conditions required for the roller. The aim is to maintain stability. The purpose of the present invention is to expand the selection range of materials that satisfy the physical properties required for elastic rollers, and to improve the performance of elastic rollers.

In order to achieve the above object, the present invention is characterized by a roller having Hojuji means for locking a removable elastic surface layer to the main body side.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 2(c), the present invention will be explained with reference to an example in which the present invention is applied to a pressure roller provided in a fixing device of an electrophotographic copying machine.

FIG. 1 illustrates a cross section of the fixing device in the direction of roller rotation. 2 is a fixing roller, which has a heating heater 13 such as a halogen heater inside. The fixing roller 1 has a heat-resistant release resin layer 11 such as tetrafluoroethylene resin provided on the outer peripheral surface of a hollow roller core 12 made of metal such as aluminum, stainless steel, or copper to a thickness of 20 to 100 p-. .

Reference numeral 2 denotes a pressure roller which, together with the fixing roller 1, pinches and conveys the plain paper supporting the toner image T to perform the fixing process. Fixing roller 1. The pressure roller 2 is rotatably supported on the fixing device, and is urged by a known pressure means so as to come into pressure contact with the fixing roller 1 at least during fixing.

The configuration of the pressure roller 2 will be explained in detail in FIGS. 2(a) to 2(C).
2, and a surface coating layer 23, which is a relatively thin, heat-resistant and releasable tube-shaped elastic body that is removably attached to the roller body.

This elastic layer 22 includes silicone rubber, foam rubber,
Rubber materials such as fluorosilicone rubber, urethane rubber, ethylene propylene rubber, and nitrile rubber are suitable. The main requirement for these rubber materials is rubber strength, and the thickness of the elastic layer 22 is preferably about 5 to 10 mm. The coating layer 23 is preferably made of a material exhibiting mold releasability, such as a silicone rubber tube, and preferably has a thickness of about 0-01 m+n to 3 mm.

The configuration of the pressure roller 2 is such that a relatively thick elastic layer 22 of the roller core material mainly secures a pressure contact area with the fixing roller, and a relatively thin heat-resistant and releasable surface coating provides surface heat resistance and surface releasability. is held by the pressure roller 2.

A temperature sensing element 4 such as a thermistor or thermocouple is placed in contact with the outer peripheral surface of the fixing roller 1, and its detection signal is guided to a known control means (not shown) to control the temperature of the outer peripheral surface of the fixing roller 1 (heater). The toner image melting temperature is maintained by controlling the output of 13 or its applied voltage, etc.).

The separating means 5 has a hook that comes into contact with the circumferential surface of each roller, and a plurality of separating claws 51 and 52 for reliably separating the recording material after fixing from the roller.

6 refers to offset toner and n(
This is a cleaning member for removing foreign matter such as powder from the roller surface, and uses a cleaning web 61 made of heat-resistant nonwoven fabric such as Nomex or Himeron.

j2 The cleaning web 61 is made of silicone rubber.

The heating roller is brought into contact with a pressing roller 63 having elasticity such as fluorosilicone rubber, fluorosilicone rubber, or silicone rubber sponge. Further, the web 611 is moved by a driven take-up reroller 65 from the supply roller 62 so as to change its abutting position little by little, so that a new surface of the cleaning web 61 always comes into contact with the heating roller.

Next, the pressure roller 2 will be described in detail with reference to FIGS. 2(a) to 2(C).

First, a roller core material shown in FIG. 2(a) is manufactured as a roller body.

This is an unvulcanized rubber sheet made by thoroughly mixing and kneading unvulcanized silicone rubber (KE-7424: Shin-Etsu Chemical) with a vulcanizing agent and leaving it at room temperature for 3 days, and an outer diameter of 50+ nm.
After blasting a flanged stainless steel core metal with an axial length of 320 mm, the surface was coated with adhesive, left in a 25°C environment for 5 hours, and then baked at 120°C for 20 minutes. Manufactured.

The core metal is covered with the unvulcanized rubber sheet, and the pressure is 150.
Post-vulcanization was carried out at 170° C. for 30 minutes (using a press vulcanizer). Furthermore, 200°C
After secondary vulcanization for 4 hours, the product was ground to an outer diameter of 58 m to produce a roller core material consisting of a metal core and an HTV silicone rubber layer.

Subsequently, a tube shown in FIG. 2(b) is manufactured as the elastic coating layer 23.

The tube as layer 23 is filled with about 20w of silicone oil.
A room temperature vulcanizable (RTV) silicone rubber (KE-12, Shin-Etsu Chemical) containing t% was injection molded into a tube shape having a curved surface parallel to the surface of the roller body.

In terms of specific numbers, the tube has a smaller inner diameter of 54mm, 55+nm, and a total length of 330mm compared to the uniform outer diameter of the roller core material of 59II1m and axial length of 320mm.
m, and a 2 mm thick protrusion 231 was provided on the outside at both ends. The convex portion 231 at the end has the effect of preventing the coating layer 23 from slipping off from the roller core material, and it is also possible to press the convex m with a link or the like.

It also serves as a support part when being worn, and has the effect of making it easier to wear.

The coating layer 23 manufactured as described in -1- was attached to the roller core material using its elasticity to form a pressure roller having an outer diameter of 60 mm.

In the pressure roll 2 mentioned above, as mentioned above, since the coating layer 23 is removable and functionally separable from the roller body, the functions required for the surface layer, such as mold releasability and heat resistance, are taken into consideration. Materials can be selected. In addition, we were able to select the material for the core material by considering the required physical strength (compression set, rubber elasticity, etc.). Therefore, a pressure roll with good functionality could be manufactured without any major limitations.

In the fixing device shown in FIG.
A roller coated with an FA coating layer is brought into pressure contact with the pressure roller 2 at a total pressure of 60 kg, and the fixing roller surface temperature is 180±0.
．． The toner image was fixed on the recording material at a speed of 23 sheets/min of A3 size paper (circumferential speed of the roller: 270 mm/5ec) under the condition of 5°C. As a result, it was confirmed that the pressure roller 2 could be used without any problems because the coating layer 23 was V:H with respect to the elastic layer 22, and that there was little staining because the mold releasability could be prioritized. Usually, the pressure roller is used for separation claws and recording materials that come into contact with the surface.1. = The surface layer is slightly worn, and there is a slight deterioration in mold releasability over time, but since only the heat-resistant mold release coating layer 23 can be replaced with a new one, the initial characteristics are restored and it can be used without any problems. did it.

On the other hand, in conventional pressure rollers in which rubber properties are emphasized and a roller core material is made of a single layer of HTV silicone rubber as a surface layer, the surface becomes conspicuously dirty and the time for replacement is premature. As a countermeasure to this problem, even if vulcanized rubber was dipped in a release agent such as silicone oil to swell the rubber layer, the reroller was still easily stained. In addition, if the pressure roller is made of only the RTV silicone rubber and metal core metal used in the pressure roller 2 and the coating layer 23 described in 1., there will be less dirt, but the physical strength will not be obtained and the pressure will be left unattended. The surface of the roller was permanently deformed, and the dents caused strange noises during driving. Further, if a pressure release mechanism is provided, the device becomes complicated, large-sized, expensive, and has low reliability.

In addition, in the configuration of the pressure roller 2, the two layers 22 and 23 are fixed to each other and cannot be detached), and the thick HTV silicone rubber layer and the thin RTV silicone rubber layer are integrally bonded to each other on the metal core in that order. If the roller is molded, manufacturing the roller is complicated and requires many man-hours, making it expensive. In addition, even if only the surface layer of the RTV silicone rubber deteriorates, the entire pressure roll must be replaced with a new one. It was uneconomical.

Next, as a second embodiment of the present invention, an example in which the fixing member of the present invention is applied to a fixing roller will be described with reference to FIGS. 4 and 5(C).

First, the features of this example will be explained using FIGS. 3(a) and 3(b). In a fixing device that performs pressure and heat treatment by sandwiching and conveying an object to be fixed between at least a pair of opposing rollers, both the fixing roller on the side that contacts the toner image and the pressure roller that opposes it have an elastic material on their surfaces. If the coating is applied, good fixing performance can be obtained. This is due to the following reasons. FIG. 3(a) shows a fixing device having the configuration shown in FIG. 1, in which a heat-releasing resin layer such as pFAmJll is provided at a pressure of 20 to 100 p on the outer peripheral surface of a metal hollow roller core as the fixing roller 1. A highly rigid roller is used, and a relatively thick layer of elastic material such as silicone rubber is applied to the outer peripheral surface of the metal roller core as the pressure roller 2 (5 to 10 mm).
FIG. 3 is an enlarged schematic diagram of a nip portion when a recording material carrying a toner image is fixed using a system using a highly elastic roller provided with a high elasticity roller. When the recording material P carrying the toner image T enters between the pair of rollers, the upper layer of the toner image T in contact with the fixing roller 1 is immediately softened and melted by the heat from the fixing roller having the heat source 13, and the toner particles are mixed together. Increase cohesion.

However, in order for the toner in the lower layer, which is closer to the side of the recording material P, to receive sufficient heat to soften and melt, it usually takes a longer time (approximately 1/100 to 5/100 seconds) than the toner in the upper layer. Furthermore, when the toner enters the toner, the toner at the periphery of the image is dislodged or thrown out due to the supply of heat and the pressure between the pair of rollers that are in pressure contact with each other. In this case, since the toner in the lower layer of the toner image softens and melts more slowly than the toner in the upper layer, it has a weak cohesive force and is particularly susceptible to this effect.

At the same time, a gap S as shown in FIG. 3(a) is created between the fixing roller, the recording material, and the toner image. When the toner separated from the toner image scatters in this gap S as described above and adheres to the recording material, the image becomes distorted.
, or if it adheres to the fixing roller, it will cause an offset. Further, in FIG. 3(a), the broken line indicates the bulge of the toner/image caused by the pressure after fixing.

As mentioned above, when the surface of the fixing roller has high rigidity, the gap S is large, resulting in poor heat transfer efficiency to the toner image, that is, poor fixing performance. In addition, the unmelted toner pushed out into the gap scatters onto the recording material and the fixing roller, resulting in a significant deterioration in image quality and many offsets.

Next, FIG. 3(b) shows that in a system using a relatively thin heat-resistant releasable elastic roller such as RTV silicone rubber as the fixing roller and a relatively thick elastic cola such as HTV silicone rubber as the pressure roller, FIG. 3 is an enlarged schematic diagram of the nip portion when copy paper bearing an image is fixed.

In this case, since the fixing roller is an elastic body, the roller follows the convex portion of the toner on the copy paper, and the gap S is extremely small, so the heat transfer efficiency to the toner is good and the fixing performance is very high. In good condition. At the same time, the bulge D of the image is small, and since the gap S is very small, offset and blurring are also reduced. Further, since the offset is very small, the cleaning device shown in FIG. 1 is not necessarily required.

However, compared to the heat-resistant mold release resins mentioned above.

Since the heat-resistant mold-releasing elastic body described in ``2'' has low physical strength,
It is prone to wear due to friction with separation claws, temperature detection sensors, etc., and is also susceptible to performance deterioration such as damage to the surface layer and deterioration over time, in which case the entire fixing roll needs to be replaced.
This causes inconveniences such as increased costs. In order to improve the above-mentioned disadvantages, attempts have been made to improve the physical strength by sacrificing the releasability to some extent, but this not only increases the likelihood of paper jams and reduces reliability, but also
In the event of a jam, the rollers would be subject to excessive pressure due to the jammed paper, which could result in damage to the receiver.

Therefore, in this example, in a fixing roll provided with a heat-resistant release elastic layer on the surface, which has good fixing performance although slightly inferior in durability, a heat-resistant release elastic layer surface coating and a roll core material are used. The present invention provides a fixing roll having good fixing performance by being configured to be easily attachable and detachable.

FIG. 4 shows one of the fixing devices to which the fixing roll of the present invention can be applied.
This is an example. Components and functions similar to those in FIG. 1 are designated by the same numbers, and descriptions thereof will be omitted. In this embodiment, since the offset is very small, the cleaning member 6 shown in FIG. 1 can be removed. In this case, the extremely small amount of offset toner does not cause deterioration in image quality, and it is sufficient to deposit it on the image area of the recording material each time. That is, it is possible to cause the recording material to function as a cleaning member. Alternatively, a small amount of offset toner on the fixing roller is transferred to the pressure roller side when there is no recording material between the rollers.

In other words, the pressure roller may act as a cleaning roller for the fixing roller, and a small amount of toner adhering to the pressure roller may be cleaned by a cleaning member 8 provided in contact with the pressure roller (see FIG. 4). The latter configuration is shown here). The cleaning member 8 may be a simple member such as felt. With such a configuration in which the cleaning member does not come into contact with the fixing roller, wear on the surface of the fixing roller can be reduced, and the life of the surface coating layer can be extended. In Figure 4, the pressure roller 2 has a total length of 330 mm and a metal roller core 2 with flanges on both ends.
It has an outer diameter of 60 mm and has a cut elastic layer 24 made of HTV silicone rubber or the like provided at a pressure of 7 nm on the outer circumferential surface of the holder. The fixing roller 1 is manufactured by the following manufacturing method. To create the roller core material, unvulcanized heat-curable silicone rubber (manufactured by Toshiba Silicone: TSE220-5 U) is sufficiently kneaded with a vulcanizing agent to form an unvulcanized rubber sheet, and this unvulcanized rubber sheet 14 is heated at room temperature. I prepared one that had been left for 3 days. Next, the outer diameter is 58.
After blasting and cleaning an aluminum hollow core (A5056) 12 with a wall thickness of 7 mm, a total pipe length of 330 mm, and flanges on both ends, an adhesive was applied, and it was left in a 25°C environment for 5 hours, and then 120' Baking was performed at 0 for 20 minutes. Thereafter, the core bar was covered with the unvulcanized rubber sheet, and the pressure was 150 kg/cm2 and the temperature was 17.
After performing secondary vulcanization at 0°C for 20 minutes and further secondary vulcanization at 200°C for 3 hours, the material was roughly ground to an outer diameter of 59.4 mm in the shape shown in Figure 5(a). It was used as a core material.

Next, a procedure for creating the heat-resistant and releasable elastic coating 15 will be described.

After adding a vulcanizing agent to unvulcanized room temperature vulcanizable silicone rubber (TSE3503 manufactured by Toshiba Silicone Rubber), it was poured into a mold. After leaving it for 3 days and demolding, heat it at 140℃ for 30 minutes.
1 hour at 160°C, 2 hours at 180°C, 2oo'c-
Secondary vulcanization was performed for t'3 hours, and the resulting product had an inner diameter of 54.4 mm, an outer diameter of 55.0 mm, and a total length of 34 mm as shown in Figure 5(b).
0 mm (larger than the total length of the pipe).

A heat-resistant and releasable elastic coating 15 was applied to the core material of the fixing roller individually prepared as described above, as shown in FIG. 5(c). In the above embodiment, the contact surfaces between the roller core material and the heat-resistant, mold-releasing elastic coating are both made of silicone rubber and have a high coefficient of friction, so that misalignment between the roller core material and the surface coating is less likely to occur.

When the fixing process was performed at the same speed as in the first embodiment using the fixing device shown in FIG. 4 using the fixing roller of the present invention,
Very good results were obtained.

Also, 50,000. By replacing the surface coating layer once every sheet, the same results as in the initial stage were obtained even after 300,000 sheets were used.

Of course, it is also possible to have a configuration in which both the fixing roller and pressure roller of the present invention described above are combined. An example in which the fixing member of the present invention is applied to a fixing roller of a fixing device having the configuration shown in FIG. 6 is shown.

In FIG. 6, the fixing roller 10 has a hollow cylindrical shape, an outer diameter of 23.8 mm, a stainless steel core material 1011 with a wall thickness of 0.5 mm, and a coating layer 102 made of a heat-resistant and releasable silicone film with a thickness of 0.1 mm. It is removably attached.

The pressure roller 9 has an aluminum core bar 91 with an outer diameter of 11 mm covered with a silicone rubber sponge 92 with a wall thickness of 6 m 111 and a sponge hardness (ASKERC) of 25 degrees. The roller has an outer diameter of 25 mm and is coated with a heat-curable silicone rubber coating 93, and is pressed against the fixing roller at a total pressure of 5 kg.

1. With the above configuration, the fixing roller surface temperature is maintained at approximately 180°C by the IKW halogen heater 13, thermistor 15 in contact with the fixing roller surface, and a control circuit (not shown), and the rise time is approximately 15°C. Seconds. Reference numeral 16 denotes a separation claw that contacts the surface of the fixing roller 10, and reference numeral 13 indicates a cleaning member made of heat-resistant felt such as Nomex felt that contacts the surface of the fixing roller 10.

A method of manufacturing the fixing roller of this example will be described below. The fixing roller 10 as a core material has a total length of 250 tm and an outer diameter of 23.8 mm.
, Fig. 7 (a) on a stainless steel pipe with a wall thickness of 0.5 mm.
As shown in the figure, large holes 04 and 105 with an outer diameter of 3 mm are provided at three locations in the circumferential direction (at intervals of 120° in circumferential angle) at a distance of 20 mm from both ends in the center. Furthermore, a notch 103, which is a groove for fitting a drive gear, is provided at one end of the fixing roller 1o. 7th
Figure (b) is a state diagram in which the driving gear 106 is attached to the core material.
It is fitted and fixed. The drive gear 106 receives a drive from a drive source on the main body of the image forming apparatus (not shown) and rotates the fixing roller. In addition, the core material 101
The surface roughness R2 of the stainless steel pipe was 5 lm.

Next, a method for manufacturing the coating layer 102 will be described. The tube for the coating layer 102 is made of low-temperature vulcanized silicone rubber (Shin-Etsu Chemical K.E.
Raw rubber to which -1204 noni vulcanizing agent (Shin-Etsu Chemical C-RK) was added was cast, heated and cured at 170°C for 90 seconds, and then demolded to give a total length of 22On+m:I as shown in Figure 7(C). The pipe has an inner diameter of 20.8+pm and a wall thickness of 0.1+nm. This tube has a diameter of 2.9 mm at an inner surface position corresponding to the holes 104, 105 of the core material 101 so as to engage with the holes 104, 105.

A convex portion 104a, ]05a having a height of 1 mm is formed. As a result, the hole and the convex part fit into the mounting surfaces of the core material 101 and the coating layer 102, and when the machine is heated during operation, the convex part of the surface coating layer thermally expands, making it possible to integrate the two. , the state is almost the same as that of the fixed layer. In other words, when the fixing roller 10 rotates, the core material 101 and the coating layer 10 are
No slip occurs between the two.

The perspective view of FIG. 7(d) is the core material 101 of FIG. 7(a) of FIG. 7(a) attached with the coating layer 102 of FIG. 7(b). During this installation, since the covering layer 102 can be expanded and contracted in the circumferential direction of the tubular shape,
The diameter difference with the core material 101 is 3 mm or more. Therefore, after installation, the elasticity corresponding to the diameter difference and the convex portion 104a,
105a holds the covering layer 1021 in close engagement with the core material. Also, when applying this engagement to a pressure roller, the error between the hole diameter and the convex diameter should be reduced to ensure a tight engagement, or the convex diameter should be slightly increased to achieve tight fit. It is preferable to do so. After being mounted in this manner, it is preferable that the surface of the fixing roller l be kept smooth.

In this embodiment, since one-coupling engaging portions are provided at both end regions in the longitudinal direction of the roller, it is possible to compensate for displacement of the coating layer in the axial direction, and a plurality of engaging portions are provided in the circumferential direction of the roller. Since this is provided, deviations in the circumferential direction can also be compensated for. These engaging portions also prevent the problem of the coating layer being twisted during installation.

As explained in FIG. 7(b), the drive gear 106 is connected to the core material 1.
01, but is not attached via the covering layer 102. This is to prevent the coating layer 102 from being disturbed by the gear. Although not shown in FIG. 7(d), the roller is usually rotatably supported by a bearing, a sleeve, or the like. In this example, it is preferable that these bearing members also not be attached to the core material 101 via the coating layer 102. In the fixing device with the above configuration, the roller circumferential speed EiOmm
/sec, A4 size paper was passed at a speed of 8 sheets/minute, and if only the above-mentioned coating layer was replaced every 5,000 sheets, the same good fixing performance as the initial one was maintained even after 100,000 sheets were passed. Obtained. The above-mentioned coating layer is a thin layer and the molding method is simple, so it can be manufactured at a very low cost.

Furthermore, for the same reason as explained in FIGS. 3(a) and 3(b), the fixing roller has better fixing properties and image quality than rollers coated with so-called Teflon such as PFA and PTFE. was gotten.

As described in ``2'' below, in the embodiment described in ``-'', in a fixing member such as a fixing roller or a fixing belt having a surface coating layer, the surface coating layer and the core material are constructed to be easily attachable and detachable. In the case of deterioration of only the layer, it is possible to replace only the surface coating layer, and since the functions of the core material and surface coating layer can be designed separately, the functions required for each can be greatly improved. It has also become possible. Therefore, it was possible to provide a fixing device that performs good fixing over a long period of time. Further, in this embodiment, an example in which the present invention is applied to a pressure roller of a heat fixing device has been described, but it is of course applicable to a fixing roller of a heat fixing device and a pressure fixing device having an elastic coating layer.

As explained above, since the present invention has a roller body with an innovative configuration in which the roller is divided into two parts, it is possible to prevent the roller body from being wasted when the surface layer wears out or deteriorates. . Furthermore, it is possible to reduce the cost and materials of the surface layer and the roller body, and it is possible to further improve the characteristics depending on the purpose. Further, since the above-described holding means is provided, the surface layer can be held securely, and excellent rotation for fixing can be provided during fixing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a fixing device to which the present invention can be applied, FIG. 3(a) and 3(b) are schematic diagrams for explaining the fixing properties of a fixing device to which the present invention is effectively applied, and FIG. 4 is an explanatory diagram of an embodiment to which the present invention is applied. Figure 5(a), Figure 5(b). FIG. 5(c) is a partial explanatory diagram of an embodiment of the present invention, and FIG.
The figure is an explanatory diagram of another embodiment to which the present invention is applied, and Fig. 7 (
a), FIG. 7(b), FIG. 7(c), and FIG. M'7(d) are explanatory diagrams of the main parts of the embodiment in FIG. 6, respectively. 2 is a fixing roller, 2 is a pressure roller, 21 is a core metal, 22 is an elastic layer, and 23 is a coating layer. Applicant Canon Co., Ltd. 8B(b)

Claims (2)

[Claims] (1) A surface layer-attached type fixing roller body, which is a roller body to which a removable elastic coating layer is attached, and has a holding means for locking the elastic coating layer on the surface portion. (2) The surface layer-attached type fixing roller body according to claim 1, wherein the holding means is an abrasive layer formed on the surface of the roller body.