JPH11184299A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device capable of improving the durability of an oil feeding roller furnished with a porous fluorinated resin film (oil transmission layer) on the outermost layer, and preventing an image quality of transfer material from lowering. SOLUTION: This device is provided with a cleaning roller 30 on a periphery of the fixing roller 1 at the side that the transfer material is discharged thereon, between a contact part with the pressure roller 2 and the contact part with the oil feeding roller 3 furnished with the coil transmission layer on the outermost layer. On the occasion when the toner image is fixed on the transfer material, by the rotary work of the fixing roller 1 and the pressure roller 2, the toner is offset (stuck) with respect to the fixing roller 1. This offset toner, is removed by the cleaning roller 30, at this side before transported to the soil feeding roller 3 in company with the rotation of the fixing roller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for fixing an unfixed toner image on a transfer material such as recording paper by heating and pressing. Specifically, by providing a cleaning member near the fixing roller to clean toner adhering to the fixing roller, or by coating the outermost layer of the pressure roller with a conductive member and providing a static elimination member in the vicinity thereof, It reduces adhesion of offset toner to an oil supply roller provided with a transmission layer (porous fluororesin film) as an outermost layer, improves durability of the oil supply roller, and prevents deterioration of image quality of a transfer material. The present invention relates to a fixing device to be obtained.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus using a powder toner such as a printer or a copying machine has been known. The fixing device is mainly applied to such an image forming apparatus.

FIG. 4 shows a conventional fixing device 1.
FIG. 2 is a cross-sectional view illustrating a schematic configuration of a zero. In FIG. 4, a fixing device 10 guides a transfer material (not shown) to which a toner image is electrostatically attached between a fixing roller 1 and a pressure roller 2 by a housing 9 constituting an outer frame of the apparatus main body. Guide 4 and fixing roller 1 for heating and fusing the toner image on the transfer material.
Roller 1 having a built-in heater 5 for supplying heat to the toner, a pressing roller 2 for applying a pressing force for fixing the fused toner image to the transfer material, and supplying oil for releasing to the fixing roller 1 An oil supply roller 3 provided with a fluorine-based porous oil permeable layer on the outermost layer, a discharge guide 6 for guiding a transfer material on which the toner image is fixed to the discharge port 8, and a toner image fixed thereon. It has a discharge roller 7 for discharging the transfer material to the outside of the apparatus, and a discharge port 8.

The housing 9 is formed of, for example, a metal plate, and is configured to support each driving member described later. In the figure, a transfer guide for guiding a transfer material, on which a toner image is electrostatically attached by an image forming unit (not shown), between the fixing roller 1 and the pressure roller 2 is provided on a right end surface of the housing 9. 4 are formed. A discharge port 8 through which a transfer material on which a toner image has been fixed is discharged to the outside of the apparatus is formed at a left end surface portion facing the right end surface portion where the carry-in guide 4 is formed.

The fixing roller 1 is made of an aluminum core bar coated with a fluororesin film as a release layer for preventing toner from adhering to the outermost layer. It is arranged at the position facing. In this example,
The fixing roller 1 rotates clockwise by applying a rotational force from a power unit (not shown) provided in the image forming apparatus main body. The fixing roller 1 has a built-in heater 5 for supplying heat to the fixing roller 1 to heat and fuse the toner image electrostatically attached to the transfer material.

The pressure roller 2 has a metal core coated with silicone rubber, and has a release layer on the outermost layer, similarly to the fixing roller 1, and is disposed below the fixing roller 1 in the figure. Has been established. A predetermined pressing force is applied to the pressure roller 2 by an urging means (not shown) provided inside the fixing device, and the pressure roller 2 is pressed against the fixing roller 1. Thus, when the fixing roller 1 rotates clockwise, the pressing roller 2 rotates counterclockwise accordingly.

The oil supply roller 3 has a thick porous tissue material such as polyester polyurethane or polyethylene filled with a silicone release oil such as dimethyl silicone oil, and the outermost layer is filled with a predetermined amount of the oil. A porous fluorine resin film is provided as an oil permeable layer for transmission. The oil supply roller 3 is disposed on the upper right side of the fixing roller 1 in the drawing, and is pressed against the fixing roller 1 with a predetermined pressing force by an urging means (not shown) provided inside the fixing device. Therefore, when the fixing roller 1 rotates clockwise, the oil supply roller 3 rotates counterclockwise accordingly.

When the oil supply roller 3 rotates according to the rotational force of the fixing roller 1, a small amount of the filled oil oozes out from the fine holes of the porous fluororesin film described above, and the circumference of the fixing roller 1 The oil is uniformly applied to the surface. This prevents the fused toner from adhering (offset) to the fixing roller 1.

The discharge guide 6 guides the transfer material on which the toner image is fixed by the rotation of the fixing roller 1 and the pressure roller 2 to the discharge port 8 side. 8 are arranged. A pair of discharge rollers 7 for discharging the transfer material guided by the discharge guide 6 to the outside of the apparatus from the discharge port 8 are provided between the discharge guide 6 and the discharge port 8.

A transfer material on which a toner image is electrostatically adhered is guided to a carry-in guide 4 and supplied to a pressure contact portion between the fixing roller 1 and the pressure roller 2 from outside the fixing device 10 having the above-described structure. (The supply direction is indicated by arrow A). By the rotation operation of the fixing roller 1 and the pressure roller 2 described above, the transfer material on which the toner image is electrostatically attached is moved toward the discharge guide 6 while being drawn and pressed. At this time, the toner image on the transfer material is heated and melted by the heater 5, and the fixing roller 1
Crushed by. Thus, the toner image is fixed on the transfer material. In this case, the oil supply roller 3 rotates according to the rotational force of the fixing roller 1, and the oil is uniformly applied to the peripheral surface of the fixing roller 1. Therefore, the fused toner is prevented from adhering to the fixing roller 1.

The transfer material on which the toner image is fixed is discharged to the discharge guide 6 by the rotation of the fixing roller 1 and the pressure roller 2, and is discharged by the rotation of the discharge roller 7 disposed ahead of the transfer guide. It is discharged from the outlet 8 to the outside of the apparatus (the discharge direction is indicated by arrow B).

[0012]

By the way, in the fixing device 10 having the above-described structure, oil for releasing the coating is applied to the fixing roller 1 to prevent the offset. Cannot be completely prevented, and the offset toner is conveyed to the oil supply roller 3 side with the rotation of the fixing roller 1 and adheres to the oil supply roller 3. Then, as the use of the apparatus is repeated, the porous fluorine resin film (oil permeable layer) constituting the outermost layer of the oil supply roller 3 is clogged. For this reason, the supply of oil to the fixing roller 1 decreases, and the amount of toner offset to the fixing roller 1 increases, so that the offset toner attached to the oil supply roller 3 develops into a granular shape. Therefore, the offset toner that has developed into a granular shape is
There is a problem that the image quality of the toner image fixed on the transfer material is deteriorated by re-adhering to the transfer material or dropping directly on the transfer material.

In order to solve this problem, as shown in FIG. 5, a cleaning roller 11 for cleaning the offset toner adhered to the oil supply roller 3 is pressed against the oil supply roller 3 to It has already been known that the peripheral surface of the oil supply roller 3 is always kept clean by rotating the oil supply roller 3 in accordance with the rotation.

However, as shown in FIG. 5, when the cleaning roller 11 is pressed directly against the peripheral surface of the oil supply roller 3, if the pressing force is strong, the oil supply roller 3 formed by the elastic member is deformed. As a result, there is a problem that the oil supply roller 3 does not rotate according to the rotational force of the fixing roller 1. Further, if the pressing force applied is weak, the cleaning of the offset toner adhered to the oil supply roller 3 becomes insufficient, so that the offset toner adhered to the oil supply roller 3 develops into a granular shape with repeated use of the apparatus, The above-described problem occurs.

Therefore, according to the present invention, the adhesion of the offset toner to the oil supply roller provided with a porous fluororesin film as the oil permeable layer on the outermost layer is reduced, and the durability of the oil supply roller is improved. It is an object of the present invention to provide a fixing device capable of preventing a deterioration in image quality of a transfer material.

[0016]

A fixing device according to the present invention includes a release layer for releasing a toner from an outermost layer, and is pressed against a fixing roller having a built-in heater and a fixing roller.
A pressure roller rotated according to the rotational force of the fixing roller;
Oil for mold release is filled in the thick porous tissue material, and the outermost layer of the thick porous tissue material is provided with a porous fluorine-based resin film for transmitting oil, and is provided on the release layer of the fixing roller. An oil supply roller that is pressed against the fixing roller to apply oil, and passes the transfer material on which the unfixed toner image is formed between the fixing roller and the pressure roller, so that the transfer material on the transfer material is In a fixing device in which an unfixed toner image is heated and pressed to fix the transfer material, the contact portion of the pressure roller and the contact portion of the oil supply roller are formed on the peripheral surface of the fixing roller on the side where the transfer material is discharged. A cleaning member is provided between them.

When the toner image is fixed on the transfer material by the rotation of the fixing roller and the pressure roller, the toner is offset with respect to the fixing roller. This offset toner is removed by the cleaning member before being conveyed to the oil supply roller side with the rotation of the fixing roller and attached to the oil supply roller. As a result, the adhesion of the offset toner to the oil supply roller having a porous fluorine-based resin film (oil permeable layer) as the outermost layer is reduced, and the durability of the oil supply roller is improved.
A decrease in image quality of the transfer material is prevented.

Further, the fixing device according to the present invention includes a release layer for releasing the toner in the outermost layer, and a fixing roller having a built-in heater and a pressure roller which is pressed against the fixing roller and rotates according to the rotational force of the fixing roller. The pressure roller and the thick porous tissue material are filled with oil for release, and the outermost layer of the thick porous tissue material is provided with a porous fluororesin film for transmitting the oil, An oil supply roller pressed against the fixing roller to apply oil to a release layer of the fixing roller,
In a fixing device in which an unfixed toner image is formed and passed through a fixing roller and a pressure roller, the unfixed toner image on the transfer material is heated and pressed to fix the transfer material on the transfer material. A conductive member is coated on the outermost layer of the pressure roller, and a charge removing member is provided near the pressure roller.

By the rotation of the fixing roller and the pressure roller, the outermost layer of the pressure roller on which the toner image is fixed on the transfer material is coated with a conductive member, and a charge removing member is provided near the pressure roller. As a result, the charge amount of the pressure roller is reduced, the potential difference between the fixing roller and the pressure roller is reduced, and the toner that is offset with respect to the fixing roller is reduced. As a result, the adhesion of the offset toner to the oil supply roller having a porous fluorine-based resin film (oil permeable layer) as the outermost layer is reduced, the durability of the oil supply roller is improved, and the image quality of the transfer material is improved. Reduction is prevented.

By providing a cleaning member for cleaning the peripheral surface of the oil supply roller so as to be in contact with the peripheral surface of the oil supply roller, the offset toner adhered to the oil supply roller develops into a granular shape. It can be automatically removed before. As a result, the adhesion of the offset toner to the oil supply roller having a porous fluorine-based resin film (oil permeable layer) as the outermost layer is further reduced, and the durability of the oil supply roller is further improved, and the image of the transfer material is further improved. Deterioration of quality is prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a fixing device 100 according to a first embodiment. In FIG. 1, parts corresponding to those in FIG. 4 are denoted by the same reference numerals.

The fixing device 100 guides a transfer material (not shown) on which a toner image is electrostatically adhered to between a fixing roller 1 and a pressure roller 2 by a casing 9 constituting an outer frame of the apparatus main body. Guide roller 4, a fixing roller 1 having a built-in heater 5 for heating and melting the toner image on the transfer material, and a pressing force for applying a pressing force for fixing the fused toner image to the transfer material. The pressure roller 2, the oil supply roller 3 having a fluorine-based porous oil supply layer on the outermost layer for supplying oil for release to the fixing roller 1, and the toner offset to the fixing roller 1 are adsorbed and removed. Roller 30 for guiding the transfer material on which the toner image has been fixed to the discharge port 8 side, and a discharge roller 7 for discharging the transfer material on which the toner image has been fixed to the outside of the apparatus. Has an outlet 8 .

The housing 9 is formed of, for example, a metal plate, and is configured to support each driving member described later. In the figure, a transfer guide for guiding a transfer material, on which a toner image is electrostatically attached by an image forming unit (not shown), between the fixing roller 1 and the pressure roller 2 is provided on a right end surface of the housing 9. 4 are formed. A discharge port 8 through which a transfer material on which a toner image has been fixed is discharged to the outside of the apparatus is formed at a left end surface portion facing the right end surface portion where the carry-in guide 4 is formed.

The fixing roller 1 is made of an aluminum core bar coated with a fluororesin film as a release layer for preventing toner from adhering to the outermost layer, and faces the edge 4 a of the carry-in guide 4. Located at the location. For example, as the fixing roller 1, a roller in which PFA (tetrafluoroethylene / perfluoroalkylvinyl ether copolymer) is coated on an aluminum core with a thickness of 10 to 30 μm, preferably 17 μm is used. In this example, the fixing roller 1 rotates clockwise by applying a rotational force from a power unit (not shown) provided in the image forming apparatus main body. The fixing roller 1 has a built-in heater 5 for heating and fusing the toner image electrostatically attached to the transfer material. The surface temperature of the fixing roller 1 is heated to about 200 ° C. by the heater 5.

The pressure roller 2 has a metal core coated with silicone rubber and has a release layer on the outermost layer, similarly to the fixing roller 1, and is disposed below the fixing roller 1 in the figure. Has been established. For example, as the pressure roller 2, S
A core metal made of UM steel is coated with 5 mm thick silicone rubber, and the outermost layer is coated with the above-mentioned PFA. And the pressure roller 2
Although not shown, a predetermined pressing force is applied by urging means provided inside the fixing device 100, and the pressing device is pressed against the fixing roller 1. Therefore, when the fixing roller 1 rotates clockwise, the pressing roller 2 rotates counterclockwise accordingly.

The oil supply roller 3 has a hardness of 15 to
25 degrees (Asker TYPE manufactured by Kobunshi Keiki Co., Ltd.
For example, 80 g of dimethyl silicone oil having a kinematic viscosity of 1000 cst is added to a thick porous tissue material such as polyester-based polyurethane or polyethylene having
And a porous fluororesin film for permeating the oil in the outermost layer is 30 to 200 μm, preferably 50 to 200 μm.
Those coated with a film thickness of μm are used. The oil supply roller 3 is disposed on the upper right side of the fixing roller 1 in the drawing, and 200 to 800 mm within a range of 300 mm by an urging unit (not shown) provided inside the fixing device 100.
It is pressed against the fixing roller 1 with a pressing force of gf.
Therefore, when the fixing roller 1 rotates clockwise, the oil supply roller 3 is accordingly rotated counterclockwise.

When the oil supply roller 3 rotates according to the rotational force of the fixing roller 1, a small amount of the oil contained therein oozes out from the fine holes of the porous fluororesin film described above, and The oil is uniformly applied to the peripheral surface. As a result, the fused toner is transferred to the fixing roller 1.
To prevent offset. The amount of oil applied is, for example, 0.04 to 1 mg, preferably 0.13 mg, each time one A4 size transfer material is copied.

The cleaning roller 30 has a hardness of 25 to 3
5 degrees (Asker TYPE manufactured by Kobunshi Keiki Co., Ltd.
C) (measured by a C-measuring machine), and preferably, the outermost layer of which is obtained by firing a toner. The cleaning roller 30 is disposed on the upper left side of the fixing roller 1 in the figure, and is, for example, 0.8 to 1.2 kgf, preferably 1.0 kgf by an urging means (not shown) provided inside the fixing device 100. It is pressed against the fixing roller 1 with a pressing force. Therefore, when the fixing roller 1 rotates clockwise, the cleaning roller 30 rotates counterclockwise accordingly.

The discharge guide 6 guides the transfer material on which the toner image has been fixed by the rotation of the fixing roller 1 and the pressure roller 2 to the discharge port 8 side. 8 are arranged. A pair of discharge rollers 7 for discharging the transfer material guided by the discharge guide 6 to the outside of the apparatus from the discharge port 8 are provided between the discharge guide 6 and the discharge port 8.

In the above configuration, the transfer material to which the toner image is electrostatically attached from outside the fixing device 100 is guided to the carry-in guide 4 from outside the fixing device 100, and the fixing roller 1
Is supplied to the pressure contact portion between the pressure roller 2 and the pressure roller 2 (the supply direction is indicated by an arrow A). By the rotation operation of the fixing roller 1 and the pressure roller 2 described above, the transfer material on which the toner image is electrostatically attached is moved toward the discharge guide 6 while being drawn and pressed. At this time, the toner image on the transfer material is heated and melted by the heater 5 and crushed by the fixing roller 1. Thus, the toner image is fixed on the transfer material. In this case, the oil supply roller 3 rotates according to the rotational force of the fixing roller 1, and the oil is uniformly applied to the peripheral surface of the fixing roller 1.
Therefore, the fused toner is prevented from adhering to the fixing roller 1.

The cleaning roller 30 rotates counterclockwise according to the rotational force of the fixing roller 1. Then, when the toner image on the transfer material is crushed by the fixing roller 1 while being melted by the heater 5, the toner offset to the fixing roller 1 is attracted to the cleaning roller 30 and removed from the fixing roller 1. Since the fixing roller 1 is formed of the aluminum core as described above, the cleaning roller 30 can be strongly pressed against the fixing roller 1.

For this reason, the toner offset to the fixing roller 1 is surely attracted to the cleaning roller 30, and
It is removed from the fixing roller 1. Further, the toner offset to the fixing roller 1 can be absorbed and removed from the fixing roller 1 before being conveyed and adhered to the oil supply roller 3 side, so that the offset toner adhering to the oil supply roller 3 is reduced. be able to. Therefore, the durability of the oil supply roller 3 is improved, and the offset toner does not develop into a granular shape, so that the image quality of the transfer material can be prevented from lowering.

As a result of the experiment, when the cleaning roller 30 is not provided, or when the cleaning roller 11 is brought into contact with the oil supply roller 3 (see FIG. 5), 30,000 copies of the granular toner are discharged from the oil supply roller 3. The durability of the oil supply roller 3 was about 30,000 copies due to peeling and image failure. However, in the first embodiment according to the present invention, a favorable result that the durability was improved up to about 100,000 copies could be obtained.

Incidentally, as described above, the fixing roller 1
The cause of the toner offset may be due to the potential difference between the fixing roller 1 and the pressure roller 2. That is, in the process of fixing the toner image on the transfer material, both the fixing roller 1 and the pressure roller 2 are negatively charged due to friction when the transfer material passes between the fixing roller 1 and the pressure roller 2. I do. Due to the material constituting the pressure roller 2, the pressure roller 2 is more negatively charged, and a large potential difference occurs. Therefore, the negatively charged toner on the transfer material is pulled toward the fixing roller 1 and adheres to the fixing roller 1 (electrostatic offset).

FIG. 2 shows a schematic configuration of a fixing device 100A according to a second embodiment. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The pressure roller 2A in the fixing device 100A shown in FIG. 2 is obtained by coating the outermost layer of the pressure roller 2 constituting the fixing device 100 shown in FIG. 1 with a conductive member. A brush 50 is provided in the vicinity of the pressure roller 2A as a charge removing member for erasing negative charges.
As a result, the negative charging amount of the pressure roller 2A is small, the potential of the pressure roller 2A increases, the potential difference from the fixing roller 1 is reduced, and the electrostatic offset is reduced.

As the conductive member, for example, the above-described PF
A mixed with carbon is used. By coating this on the outermost layer of the pressure roller 2A, the surface resistivity of the pressure roller 2A becomes 1 × 10 ⁸ to 1 × 10 ⁶ Ω / □, and the peripheral surface of the pressure roller 2A becomes conductive. .

The brush 50 is formed by fixing an electrode part 52 to a holder 51 made of a conductive material. The electrode portion 52 may be made of stainless steel in a fibrous form, bundled together, acrylic fiber in which carbon particles are dispersed in a streak or dyed with copper ions, carbon fiber alone, A nonwoven fabric or the like is used. The brush 50 is attached and fixed to the housing 9. In the drawing, the brush 50 is arranged on the lower surface side of the housing 9 such that the electrode portion 52 is in contact with the peripheral surface of the pressure roller 2A or has a predetermined interval.

In the fixing device 100A shown in FIG.
As described above, the potential difference between the pressure roller 2A and the fixing roller 1 is reduced, and the amount of toner (the direction of pulling is indicated by an arrow T in the drawing) from the transfer material 40 toward the fixing roller 1 is reduced, and the electrostatic offset is reduced. Reduce. Therefore, offset toner adhering to the oil supply roller 3 from the fixing roller 1 can be reduced. As a result, the durability of the oil supply roller 3 is improved, and the offset toner does not develop into a granular shape, so that the image quality of the transfer material 40 can be prevented from lowering.

The fixing device 100A according to the second embodiment shown in FIG. 2 corresponds to the fixing device 100 shown in FIG. 1 having the cleaning roller 30, but does not have the cleaning roller 30. Fixing device 1 shown in 4
The same applies to 0.

According to the first and second embodiments of the present invention described above, even if the offset toner adhering to the oil supply roller 3 is reduced, the outermost layer of the oil supply roller 3 is formed as the use of the apparatus is repeated. It is possible that the porous fluororesin film (oil permeable layer) is clogged.

FIG. 3 shows a schematic configuration of a fixing device 100B according to a third embodiment. 3, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the fixing device 100B shown in FIG. 3, a brush as a cleaning member for automatically removing the offset toner adhering to the oil supply roller 3 constituting the fixing device 100 shown in FIG. 60 are provided.

As the brush 60, for example, a resin in which a fibrous resin is attached and fixed to a metal holder is used. The brush 60 is, as shown in FIG.
And a fibrous portion constituting the brush 60 is in contact with the peripheral surface of the oil supply roller 3 so as to dam the offset toner adhering to the oil supply roller 3. The entire width of the brush 60 is formed in accordance with the entire length of the oil supply roller 3 so that the entire oil supply roller 3 is uniformly cleaned.

When the oil supply roller 3 rotates according to the rotational force of the fixing roller 1, the offset toner adhering to the peripheral surface of the oil supply roller 3 is automatically blocked by the brush 60. Thereby, the oil supply roller 3
Can always be kept clean and can prevent clogging. Therefore, the durability of the oil supply roller 3 is improved, and the offset toner does not develop into a granular shape, so that the image quality of the transfer material 40 can be prevented from lowering.

The fixing device 100B according to the third embodiment shown in FIG. 3 corresponds to the fixing device 100 shown in FIG. 1 having the cleaning roller 30, but is provided on the outermost layer of the pressure roller 2A. The present invention can be similarly applied to a fixing device 100A shown in FIG. 2 in which a conductive member is coated and a brush 50 for static elimination is provided.

As a result of the experiment, when the cleaning roller 30 is not provided or when the cleaning roller 11 is brought into contact with the oil supply roller 3 (see FIG. 5), the durability of the oil supply roller 3 is about 30,000 copies. Was. However, in the third embodiment according to the present invention, 15
A good result that the durability is improved up to about 10,000 copies can be obtained.

In the above-described first embodiment, the cleaning member that adsorbs and removes the toner that is offset from the fixing roller 1 is formed using a roller. However, the toner is adsorbed and removed. A non-rotating one may be used.

In the above-described third embodiment, a brush is used as a cleaning member for automatically removing the offset toner adhering to the oil supply roller 3 before developing the toner into a granular shape. The present invention is not limited to this as long as it removes offset toner adhering to the peripheral surface of the oil supply roller 3. For example, the above-described conventional cleaning roller 11 can be used. In this case, since the cleaning roller 11 is an auxiliary member for removing the offset toner that cannot be completely removed by the cleaning roller 30 from the oil supply roller 3, the problem that occurs when the cleaning roller 11 is used does not occur. .

[0050]

According to the present invention, a cleaning member is provided in the vicinity of the fixing roller to clean the toner adhered to the fixing roller, and the outermost layer of the pressure roller is coated with a conductive member, and the outermost layer is formed in the vicinity thereof. A static elimination member was provided.

As a result, the adhesion of the offset toner to the oil supply roller having a porous fluorine resin film (oil permeable layer) as the outermost layer is reduced, the durability of the oil supply roller is improved, and the transfer material is improved. It is possible to prevent a decrease in image quality.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a schematic configuration of a fixing device according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating a schematic configuration of a fixing device according to a second embodiment.

FIG. 3 is a cross-sectional view illustrating a schematic configuration of a fixing device according to a third embodiment.

FIG. 4 is a diagram illustrating a schematic configuration of a conventional fixing device.

FIG. 5 is a diagram illustrating a schematic configuration of another conventional fixing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing roller 2, 2A Pressure roller 3 Oil supply roller 9 Case 30 Cleaning roller 40 Transfer material 50 Brush 51 Holder 52 Electrode part 60 Brush 100, 100A, 100B Fixing device

Claims (4)

[Claims] An outermost layer having a release layer for releasing the toner, a fixing roller having a built-in heater, a pressure roller pressed against the fixing roller and rotated according to a rotational force of the fixing roller. An oil for mold release is filled in the thick porous tissue material, and the outermost layer of the thick porous tissue material is provided with a porous fluorine-based resin film for transmitting the oil, An oil supply roller that is pressed against the fixing roller to apply the oil to the release layer, and transfers the unfixed toner image-formed transfer material between the fixing roller and the pressure roller. A fixing device that heat-presses and fixes the unfixed toner image on the transfer material to the transfer material by allowing the toner to pass therethrough, on the peripheral surface of the fixing roller on the side where the transfer material is discharged, Contact part of the pressure roller Fixing apparatus characterized by provision of the cleaning member between the contacting portion of the oil supply roller. 2. A fixing roller having a release layer for releasing a toner as an outermost layer and incorporating a heater, and a pressure roller pressed against the fixing roller and rotated according to a rotational force of the fixing roller. An oil for mold release is filled in the thick porous tissue material, and the outermost layer of the thick porous tissue material is provided with a porous fluorine-based resin film for transmitting the oil, An oil supply roller that is pressed against the fixing roller to apply the oil to the release layer, and transfers the unfixed toner image-formed transfer material between the fixing roller and the pressure roller. In a fixing device in which the unfixed toner image on the transfer material is heated and pressed to fix the transfer material, the outermost layer of the pressure roller is coated with a conductive member. Static elimination near rollers Fixing apparatus characterized by wood is provided. 3. A fixing roller having a release layer for releasing a toner in an outermost layer and including a heater, a pressure roller pressed against the fixing roller and rotated according to a rotational force of the fixing roller. An oil for mold release is filled in the thick porous tissue material, and the outermost layer of the thick porous tissue material is provided with a porous fluorine-based resin film for transmitting the oil, An oil supply roller that is pressed against the fixing roller to apply the oil to the release layer, and transfers the unfixed toner image-formed transfer material between the fixing roller and the pressure roller. A fixing device that heat-presses and fixes the unfixed toner image on the transfer material to the transfer material by allowing the toner to pass therethrough, on the peripheral surface of the fixing roller on the side where the transfer material is discharged, Contact part of the pressure roller A cleaning member is provided between the contact portion of the oil supply roller and a conductive member is coated on an outermost layer of the pressure roller, and a charge removing member is provided near the pressure roller. Fixing device. 4. The method according to claim 1, wherein a cleaning member for cleaning a peripheral surface of the oil supply roller is provided so as to contact the peripheral surface of the oil supply roller. Fixing device.