JPS5842465B2 - Fusing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a toner image fixing device.

In fields that handle toner images, such as electrophotography, as a device for fixing the toner image on the support material, a toner image support material is sandwiched and conveyed by a pair of rollers, at least one of which is heated internally or externally. As a result, devices configured to heat and melt the toner and fix it on the support material are often used, but in this case, in order to prevent toner offset and the support material from wrapping around the roller, the support material is usually It is well known that an anti-offset liquid (usually silicone oil is used) is applied to the fixing roller on the side where the toner image surface is pressed.

The methods currently in use for applying the above-mentioned anti-offset liquid to the fixing roller include directly contacting the fixing roller with felt that absorbs and retains silicone oil through capillary action, or by contacting the fixing roller with felt. This method supplies silicone oil to the fixing roller by bringing it into contact with a rotating coating roller or a roller in a row of coating rollers, but in such a method, the amount of oil applied tends to be too large. As a result, the toner image support material becomes stained with oil, and when adding ink to the support material later, not only does the ink adhere poorly, but also slip occurs between the fixing roller and the pressure roller, disturbing the toner image. I do things.

Even if this is not the case, the amount of oil consumed is unnecessarily wasted, which is uneconomical, and the frequency of oil replenishment or oil supply cartridge replacement increases, making maintenance troublesome.

Therefore, US Pat. No. 3,718,116 and US Pat. No. 374
5972 specification, Utility Model Publication No. 53-51168,
An apparatus has been disclosed in which an attempt is made to reduce the amount of oil applied by using a two-layer felt consisting of a felt with a sparse fiber density and a felt with a dense fiber density, and bringing the dense felt into contact with a roller.

However, even with this device, the amount of coating is still large, and the amount of coating is more than necessary for preventing offset and preventing the support material from wrapping around the roller.

Furthermore, with the above-mentioned devices, oil with a low viscosity of about 50 to 350 cs at room temperature can be applied relatively uniformly at first, but when using rollers coated with silicone rubber, it is difficult to swell the oil, and during maintenance and inspection, etc. A high-viscosity anti-offset liquid is useful because it is easy to handle and ensures that a large amount of liquid does not accumulate on the roller or drip from the felt when the equipment is stopped. When using the above conventional method, especially in a device such as the one described in the above publication in which a felt with dense fibers is brought into contact with a roller, uneven coating tends to occur in the form of streaks, and it is difficult to apply a small amount uniformly. It is extremely difficult.

Another serious drawback of the above-mentioned devices, which apply anti-offset liquid by bringing the felt into contact with a roller, is that the carrier contained in the toner, paper powder, or latent image developer that forms the toner image. The problem is that particles etc. clog the felt, which causes uneven application.

If this uneven coating occurs, toner offset may occur locally, and the image supporting material may wrap around the roller.If the fixing roller or pressure roller is coated with silicone rubber, the uneven coating may cause the roller to swell. bring about differences,
There is also the disadvantage that the toner image supporting material tends to wrinkle.

Furthermore, when a large amount of toner adheres to the felt, this damages the roller, further promotes the above-mentioned uneven coating, and further causes various fixing defects.

On the other hand, a silicone rubber roller with silicone oil infiltrated into the rubber structure or a roller coated with silicone rubber and a perforated pipe containing silicone oil is brought into contact with the fixing roller, and the anti-offset liquid is applied to the fixing roller through the rubber structure. Methods are also known.

Although it is possible to uniformly apply a small amount using such a method, the amount is so small that a device, such as the fixing device used in current copying machines, must be able to fix more than 7.8 sheets of A4 paper per minute. completely unsuitable for

In this method, the amount of visually inspected cloth at which the liquid becomes highly viscous is further reduced.

JP-A-52-110049 and JP-A-54-377 provide a clue to solving the various inconveniences mentioned above.
There is a fixing device described in Japanese Patent No. 52.

The fixing device described in both of these publications uses a non-fibrous polymeric synthetic resin film with fine continuous pores, that is, a film in which fibers are entangled like felt, etc., or a film with many air bubbles or single cells like a sponge. The amount of silicone oil applied to the fixing roller is controlled by a polymeric synthetic resin film that has a large number of micropores that penetrate from the front surface to the back surface of the film, rather than having silicone oil dispersed in the film.

The above membranous body is GORE-TEX JOINT
5EALANT (W, LGORE & ASSOCIATE
S, manufactured by INC, product name), etc., with fine continuous pores,
A tetrafluoroethylene resin film is preferred because it also has excellent anti-offset properties.

In any case, the fine continuous pores mentioned above will not be clogged with toner or paper dust (and toner will not accumulate and stick to the film and damage the roller, and uniform application will be maintained for an extremely long period of time). This has a very useful effect.

Even if a high-viscosity anti-offset liquid is used, streak-like uneven coating does not occur (it also has the effect of being able to be applied uniformly).

However, as the viscosity of the anti-offset liquid used decreases, the amount of oil that passes through the fine continuous pores of the membrane tends to increase.

Although this increase is sufficiently small compared to felt, it is uneconomical and undesirable to use more liquid than is necessary.

Furthermore, even if a high viscosity liquid is used, if the equipment is stopped for a very long time, the anti-offset liquid will accumulate at the contact area between the membrane and the roller, although it is much less than when using felt. Sometimes I go.

The present invention aims to solve the above problems.

In the first aspect of the present invention, a polymer synthetic resin film having fine continuous pores is brought into contact with a first roller 1, which is a fixing roller, and an anti-offset liquid is supplied to the tenth roller through this film. In a fixing device having an applicator C, one layer or a plurality of layers of a polymer synthetic resin film having continuous fine pores is further laminated on the polymer synthetic resin film having fine continuous pores, and the laminated fine pores are Polymer synthetic resin film 1 having
The fixing device is characterized in that an anti-offset liquid is supplied to the 10th-L through 3.

Further, the second invention of the present invention is such that a polymeric synthetic resin film having fine continuous pores is brought into contact with a supply rotary body 20 for supplying the anti-offset liquid to the first row 21 which is a fixing roller. In a fixing device having an applicator C that supplies an anti-offset liquid to the first roller through this film, the polymer synthetic resin film having fine continuous pores is further provided with one or more layers of fine continuous pores. This fixing device is characterized in that a polymer synthetic resin film 13 having micropores is laminated, and an anti-offset liquid is supplied to the supply rotating body through the laminated polymer synthetic resin film 13 having micropores.

This feature allows for more stable application of small amounts.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram of an embodiment of the first invention of the present invention.

In the figure, 1 is a fixing roller as the 10th roller, and a metal hollow pipe 2 is coated with silicone rubber, tetrafluoroethylene resin, etc.
It is coated with a thin coating 3 of anti-offset material, and a heater 4 is placed in the middle, which heats the surface to a temperature that can melt and fix the toner (usually 150°C to 200°C).
) is heated.

Reference numeral 5 denotes a pressure roller as a second roller, and a core metal roll 6 is coated with a thick coating 7 of a flexible elastic material having anti-offset properties, such as silicone rubber.

The pressure roller 5 is pressed against the fixing roller 1, and as shown in the figure, is elastically deformed at the pressure contact portion to form a nip portion for sandwiching the toner image support material.

One of the rollers 1 and 2 is rotationally driven by a motor (not shown), and the other is driven to rotate by the frictional force with the mating roller.

That is, the rollers 1 and 5 rotate in the directions of the arrows, respectively, to nip and convey the toner image supporting paper P at the nip portion.

At this time, the toner image T is thermally melted, adheres to the paper P, and is fixed.

The toner image supporting surface of the paper P is pressed against the fixing roller 1.

Note that the paper P is guided by the guide plate 8 and fed into the nip portion, and after passing through the nip, it is separated from the rollers by water-like members 9 and 10 that are lightly abutted against the rollers 1 and 5, respectively.

Reference numeral 11 denotes a surface membrane, which is a non-fibrous polymeric synthetic resin membrane having fine continuous pores of uniform diameter.

This film generally has a smooth surface to which toner adheres (that is, has anti-offset properties), and has good slip properties (has flexibility, heat resistance, oil resistance, etc.). Further, continuous pore membranes made of fluororesin are suitable because they can easily form finer continuous pores, and it has been found that a tetrafluoroethylene resin membrane is particularly suitable at present.

Tetrafluoroethylene resin membranes having such fine continuous pores are used as Fluorobor, GORE-TEXJOINT, etc. as mentioned above.
It is sold under trade names such as SEALAN, and its manufacturing method is detailed in Japanese Patent Publication No. 3068/1983.

The continuous pore diameters of such a membrane are very uniform, and the diameter distribution is approximately ioo% concentrated in a very narrow area around the average diameter, taking the form of a delta function.

Reference numeral 12 denotes a back membrane, which, like the membrane 11, is a polymeric synthetic resin membrane having fine continuous pores.

As the membrane 12, a continuous pore membrane made of a fluororesin having heat resistance, oil resistance, and flexibility is suitable.

In addition, the film 11 is excellent in such properties, it is easy to obtain finer continuous pores, and when the above-mentioned tetrafluoroethylene resin film is used for the film 11, it is easy to heat and pressurize the film 11. The tetrafluoroethylene resin membrane having the above-mentioned fine continuous pores is optimal for the membrane 12 because it can be bonded and the continuous pores do not need to be crushed.

Polymer synthetic resin membrane 11.12 having the above fine continuous pores
are laminated and bonded together by heating and pressurizing, and constitute the laminated polymer synthetic resin membrane having fine pores, in other words, the continuous pore membrane layer 13.

At this time, a part of the continuous fine pores of the membrane 11 are closed by the non-opening surface portion of the continuous fine pores of the membrane 12, and the membrane 12 communicates with the continuous fine pores of the membrane 12.

Therefore, the apparent porosity of the membrane layer 13 is smaller than the porosity of each of the membranes 11 and 120.

Now, the film layer 13 has a length in the axial direction of the roller 1 that is long enough to contact at least the area in which the paper P of the row 21 contacts, and is formed in the shape of a relatively shallow and elongated bag having an opening at the top. It is fixed to the frame member 14 at the opening.

Heat-resistant felt 15 impregnated with silicone oil is filled into this bag-shaped membrane layer 13 by capillary action.

That is, the felt 15 that absorbs and retains oil is brought into contact with the inner surface of the back membrane 12, and the silicone oil in the felt 15 oozes out from the communicating holes in the membranes 12 and 11 onto the surface of the membrane 11 and is applied to the row 21. .

(Described in detail later) 16 is a lid member, which is attached to the frame member 14 with screws or the like.

When the oil in the felt 15 has been consumed, either remove the lid member 16 and replenish the felt with oil, or take out the used felt and insert a new felt sufficiently impregnated with oil into the bag of the membrane layer 13. You can put it in.

In this way, maintenance work is carried out by moving the applicator C onto the guide rail 17.
This can be easily done by taking it out of the fixing device along the lines.

When the above operations are completed, the side protruding edges of the frame member 14 and lid member 16 are aligned with the guide rail 17, and the applicator C is pushed in along the roller 1, thereby completing the arrangement of the applicator C.

Alternatively, the applicator C may be of a cartridge type, and the one in which the oil in the felt 15 has been consumed can be replaced with a new cartridge in which the felt 15 is sufficiently soaked with oil.

The surface film 11 may be brought into contact with the roller 1 only by the weight of the applicator C, or may be brought into pressure contact with the roller 1 by pressing the upper part of the lid member 16 with a spring 18 or the like.

In any case, the membrane layer 1 made of the membrane of Fluorobor, etc.
3 has sufficient flexibility, so the surface of the film 11 can come into uniform surface contact with the roller 1 even with the weight of the applicator C, but if the felt 15 is somewhat hard or does not have a shape that fully follows the surface of the roller 10, etc. In this case, the film 11 may be brought into uniform surface contact with the roller 1 by pressing the applicator C with the spring 18 as described above.

Now, oil that has entered into the fine continuous pores of the membrane 12 that are blocked by the non-opening surface portion of the membrane 11 does not seep out onto the surface of the membrane 11.

Since the oil only seeps out from the above-mentioned communication holes, the amount of oil supplied to the row 21 can be kept to the necessary amount to prevent offset and prevent the paper P from wrapping around the roller, and wasteful consumption can be prevented. .

The oil seeping out onto the surface of the membrane 11 from the communicating holes is squeezed out at the contact surface between the membrane 11 and the row 21, so that the required amount of oil is evenly applied to the surface of the roller 1.

The pores of the membrane 11 are not clogged with toner or paper dust, and the effect of uniformly applying the required amount can be maintained for an extremely long time.

Furthermore, even if the rotation of the roller 1 is stopped for a long time with the surface of the membrane 11 in contact with the roller 1, the roller pair 1 may be damaged to the extent that the paper P is soiled on the contact surface between the membrane 11 and the roller 1. ，
It is easy to prevent oil from accumulating to the extent that it causes slip between the two.

In FIG. 1, a blade 19 made of fluorine rubber or the like is elastically brought into contact with the row 21, and scrapes off toner and paper powder that has passed through the contact area between the membrane 11 and the roller 1. This prevents the toner and paper dust from returning to the pressure contact portion of the roller 1.degree. 5 and staining the paper P.

Of course, most of the toner and paper dust adhering to the roller 1 are stopped at the beginning of contact between the membrane 11 and the roller 1 in the rotational direction of the roller 1, and accumulate on the front surface of the membrane 11.

This accumulated toner and paper dust can be easily wiped off from the surface of the membrane 11 with a cloth or the like, and in this way the membrane 11 also acts as a cleaner.

Next, an example of an experiment using the apparatus shown in FIG. 1 will be described.

The peripheral speed of rollers 1 and 5 is 120tttm/see,
The surface temperature of the roller 1 is 190 to 200 DEG C., and the thin coating 3 is made of tetrafluoroethylene resin (does not have micropores as described above).

Membrane 11 is a fluoropore membrane. (In addition, when the film 11 of the tetrafluoroethylene resin is brought into contact with the thin coating 3 of the tetrafluoroethylene resin layer in this way, the slipperiness of the film 11 is very good,
The membrane 11 is hardly worn) and the membrane 12 is also a fluoropore membrane.

The average diameter of continuous pores of the fluoropore membrane 11 is 1μ (the pore size distribution is approximately 100μ within a range of ±0.4μ around this 1μ).
% concentrated), porosity is 60%, film thickness is 0.18m
For the membrane 12 of Fluoropore, the average diameter of continuous pores is 0.2μ (the pore size distribution is concentrated in a range of ±0.05μ around this 0.2μ by approximately Zoo%),
A film having a porosity of 50% and a film thickness of 0.181 m was used, and the film layer 13 was constructed by laminating the two films 11 and 12 and laminating and bonding them under heat and pressure.

The dimensions of the contact portion of the membrane 11 against the roller 1 were 7 mm in the roller rotation direction and 300 mm in the roller generatrix direction, and the membrane 11 was brought into contact with the roller 1 with a total load of 1 kg.

The silicone oil used has a standard viscosity of 1000 at room temperature.
It is cs.

10,000 sheets of B4 size paper were fixed using the above apparatus, but no uneven application of the oil was observed, the oil was always applied uniformly, and no wrapping of the paper around the roller 1 or offset occurred at all.

Even after fixing 100,000 sheets, there was no clogging of toner in the continuous fine pores of the Fluoropore membrane 11, and almost no wear was observed, so that it could still be used.

The stains on the surface caused by toner etc. could be easily wiped off with a cloth.

Oil is 0.7 per 1000 sheets of 34 paper from start to finish.
It was consumed at a stable rate of 9 CC to Q.

Then, after every 5,000 sheets of fixing processing, the apparatus was stopped for 16 hours with the film 11 and roller 1 in contact with each other, and 10 rotations of the roller were stopped, but the amount of oil accumulated in the contact area between the film 11 and roller 1 was slightly faint, and the paper P was not stained by it.

FIG. 2 is a detailed explanatory diagram of the second aspect of the present invention.

In each of the following figures, members and means having the same functions as those in FIG. 1 are given the same reference numerals, and explanations will be omitted unless particularly necessary.

In FIG. 2, reference numeral 20 denotes a coating roller serving as a supply rotary member, and a metal core roll 21 is coated with a thin layer 22 of tetrafluoroethylene resin.

The application roller 20 contacts the fixing roller 1 having a thin silicone rubber coating 3 and rotates in the direction of the arrow.

Fluoropore membranes 11 and 12 are stacked and bonded to form a bag shape, and this stacked polymer synthetic resin membrane having micropores, in other words, the membrane layer 13 is fixed to the frame member 14. A sponge 15 is housed in the bag and is brought into contact with the inner surface of the membrane 12.

This sponge 15 absorbs and holds silicone oil and supplies it to the communicating holes of the membrane layer 13.

The oil oozes out onto the surface of the film 110 and is applied to the coating roller 2.
The oil from the application roller 20 is applied to the fixing roller 1 as both rollers rotate.

The roller 18 may be a roller driven to rotate by the frictional force between the roller 18 and the roller 1, but it can also be rotationally driven by a motor (not shown).

In this case, the roller 20 can be rotated in the opposite direction to the arrow, but
In any case, if the row 220 is rotationally driven so that its circumferential speed is lower than the circumferential speed of the roller 1, the amount of oil applied to the roller 1 can be further reduced due to the effect of the film layer 13. can.

(This film layer 3 is also preferably made of tetrafluoroethylene resin, which is less likely to wear out).

In the embodiment shown in FIG. 2, silicone oil is supplied from the oil pan 23 to the member 15 instead of impregnating the member 15 with silicone oil in advance.

That is, 24 is a felt whose lower end is immersed in the oil of the pan 23, 25 is a felt whose lower end is in contact with the member 15 through a hole provided in the lid member 16, and both felts 2
The felt 26 is brought into contact and separated at 4°25.

That is, while the rollers L5 and 20 are rotating, the felt 26 is brought into contact with the felts 24 and 25 as shown in the figure, and the oil pan 2
The oil in the felt 15 is transmitted by capillary action by the felt 24, 25, and 26, and is supplied to the felt 15.
When the rotation of the fixing device is stopped, that is, the actuating body of the fixing device is stopped, the felt 2
6 is separated from FEL) 24.25, and the oil transmission supply is stopped.

Incidentally, instead of the application roller 20, the oil may be applied to the roller 1 by rotating an endless belt as a supply rotating body in contact with both the fixing roller 1 and the film 11.

FIG. 3 is an explanatory diagram of another embodiment of the first invention similar to the embodiment of FIG. 1 of the present invention.

The coating device C is configured in the shape of a roller.

That is, 15 is a felt layer having sufficient hardness to maintain the shape of the roller wound around the core metal roll 27, and is impregnated with silicone oil.

A polymer synthetic resin membrane 1L12 such as fluoropore having fine continuous pores is laminated on the surface of this oil retaining layer, and the laminated polymer synthetic resin membrane having fine pores is laminated, in other words, the membrane layer 13 is covered.

This roller-shaped coating device C is brought into contact with the fixing roller and rotated in the direction of the arrow by the frictional force between it and the row 21, or rotationally driven by a motor.

The silicone oil impregnated into the felt 15 is the membrane 1.
1.120 seeps out from the connected fine continuous pores, membrane layer 1
It is applied to the row 21 as the roller 3 rotates.

The advantage of this device is that the contact between the membrane 11 and the roller 1 is close to a line contact, and the contact area between the two is small, so together with the effect of the membrane layer 13, the amount of oil applied to the roller 1 can be further reduced. can.

Also, even if the fixing device is stopped for a very long time, the film 1
Almost no oil accumulates in the contact area between roller 1 and roller 1.

In the above embodiment, the membrane layer 13 has a two-layer structure of the membranes 11 and 12, but it goes without saying that three or more layers of membranes having fine continuous pores may be joined.

The average diameter, porosity, and thickness of the continuous fine pores of each membrane constituting the membrane layer 13 may be the same, or one, two, or three different membranes may be stacked. The membrane layer 13 can also be configured in this manner.

In addition, the membrane constituting the membrane layer 13 has a small porosity, or a membrane with a small average diameter of continuous pores, and
Alternatively, if a film with a large thickness is used, the amount of anti-offset liquid applied to the roller can be made smaller, and if the number of such films is increased, the amount applied is further reduced.

For example, in the illustrated example, if the average diameter of the continuous pores in the membrane 12 is small (for example, 0.2μ) and the average diameter of the continuous pores in the membrane 11 is small (for example, 1μ), the amount of oil applied to the roller 1 is small. Not only can waste be eliminated by using an appropriate amount, but also a sufficient amount of oil can be stored in the large diameter continuous pores of the membrane 110 when the equipment is stopped, so there is no shortage of oil in the roller 1 from the beginning of the roller 1 rotation. You can apply the right amount of oil without any hassle.

In the above apparatus, the porosity of the continuous pores of the membrane layer, the diameter of the continuous pores of each membrane, the thickness of each membrane, the viscosity of the anti-offset liquid, that is, the amount of liquid that can be exuded through the continuous pores of the membrane layer and supplied to the roller. These various conditions that determine It should be determined in consideration of various factors such as the minimum amount of anti-offset liquid required per unit area of the toner image support material and the fixing processing speed, that is, the rotational speed of the fixing roller, in order to prevent wrapping.

However, in toner image fixing devices used in electrophotography, other electrostatic printing, magnetic photography, etc., the porosity of continuous pores in the film layer is generally 10 to 90%, and the thickness is 0.1 to 5. The average diameter of the continuous pores in the membrane that comes into contact with the roller is 0.1 to 5μ, and the average diameter of the continuous pores in the other membranes is 0.1 to 5μ.
The thickness may be about 1 to 100μ.

The viscosity of the anti-offset liquid can be selected from a wide range of 30 to 100,000 e8.

Now, Floropore, GORE-TEX JOINTSE
Polymer synthetic resin membranes having fine continuous pores such as ALANT and the like described above have a property that they are more easily stretched in one particular direction than in a direction perpendicular to this direction under the same force.

For example, a tetrafluoroethylene resin film having fine continuous pores such as fluoropores will elongate in one direction about 3 to 10 times as much as in the direction perpendicular to the same force.

To be more specific, the polymers that make up the aforementioned membrane are oriented in a direction that is difficult to stretch, and therefore the membrane tends to stretch in this direction (but in the direction perpendicular to this, it easily stretches). It stretches.

(This elongation is even more remarkable at high temperatures where toner images are melted and fixed.

), and the reason why the molecules align in one direction like this is before i
During the production of the membrane described above, a mass of polymeric synthetic resin material is stretched.

The molecules are aligned in this stretching direction, and the film has stretching resistance in this direction.

For this reason, the direction in which the polymer synthetic resin film is difficult to stretch is herein referred to as the stretching direction, and the direction perpendicular to it, in which it is easy to stretch, is referred to as the non-stretching direction. The name is for convenience, and it is important to note that the polymer synthetic resin membrane having continuous pores as described above generally has a direction in which it is easy to stretch mechanically and a direction in which it is difficult to stretch mechanically.

In any case, as mentioned above (when multiple membranes with fine continuous pores are laminated and bonded with their stretching directions aligned,
If the non-stretching direction is made to match the roller rotation direction at the contact portion between the film layer and the roller, the film layer will easily stretch and deform in the roller rotation direction due to the frictional force when the roller rotates, and the oil will be applied. Not only does the amount increase, but sometimes the membrane layer ruptures, or even if it does not rupture, it stretches beyond the limit of elastic deformation and does not return to its original shape.

Therefore, when using a membrane layer in which multiple membranes are laminated and bonded with their respective stretching directions aligned, the stretching direction intersects the generatrix direction of the roller at the contact portion with the lawn. Therefore, it is most preferable to arrange the rollers so that they coincide with the rotational direction of the rollers.

This prevents the elongation and deformation described above and prevents an increase in the amount of oil applied.

Alternatively, at least two of the polymer synthetic resin membranes having a plurality of fine continuous pores constituting the membrane layer (preferably two membranes joined to each other) are laminated with their stretching directions crossing each other. , No matter how the membrane layers are oriented and brought into contact with the roller, the non-stretching direction of at least one of the membranes must intersect with the rotational direction of this roller at the contact area between the roller and the membrane layer. Therefore, the above-mentioned inconvenience can be reduced.

It is best to have the stretching directions of the two films intersect at right angles or at an angle close to this angle.

It is preferable that the stretching direction of one of the films coincides with the rotating direction of the roller at the contact portion between the film layer and the roller.

For example, in the illustrated embodiment, the membranes 11 and 12 are laminated and bonded with their stretching directions perpendicular to each other, and the stretching direction of one membrane (preferably the membrane 11 that contacts the roller and directly receives the frictional force) is set to the membrane layer 13. By aligning the direction of rotation of this roller at the abutting part with the roller, and by aligning the stretching direction of the other film with the generatrix direction of roller 1, the film layer 13 will extend in both the rotational direction of the roller and the generatrix direction. It is difficult to stretch and deform, and greatly contributes to stabilizing the amount of coating.

Note that the polymer synthetic resin membrane having fine continuous pores that can be applied to the present invention is not only a tetrafluoroethylene resin fine continuous pore membrane, but also a fine continuous pore membrane of other polymer synthetic resins such as a vinyl chloride resin fine continuous pore membrane. The porous membrane is also good.

As the anti-offset liquid, not only silicone oil but also liquid polypropylene, liquid polyethylene, etc. can be used.

Furthermore, in the above embodiments, the anti-offset liquid was directly supplied to the fixing roller by the coating device C, but the anti-offset liquid was first applied to the pressure roller by the coating device C, and then the liquid was applied from the pressure roller to the fixing roller. It can also be painted.

In addition to felt, sponge, woven fabric, and nonwoven fabric can also be used as the absorbent liquid holding and supplying member 15.

Furthermore, in the above embodiment, a device for heating and melting a toner image is shown, but in the present invention, a pair of rollers strongly presses and conveys a toner image support material, and the pressure is used to fix the toner image on the support material. It can also be applied to fixing devices.

[Brief explanation of the drawing]

Figures 1 and 3 show the first embodiment of the first invention of the present invention, and the second embodiment of the invention.
FIG. 2 is a detailed explanatory diagram of the second invention of the present invention, in which 1 is a fixing roller, 5 is a pressure roller, 11 is an explanatory diagram of an embodiment, and FIG.
, 12 is a polymer synthetic resin membrane having fine continuous pores, 15
is a liquid supply member that impregnates and holds an anti-offset liquid.

Claims (1)

[Scope of Claims] 1. A fixing device that fixes a toner image by sandwiching and conveying a toner image support material between a first and second roller, the tenth roller having a polymeric synthetic resin film having fine continuous pores. In a fixing device having an applicator that supplies an anti-offset liquid to the first roller through this film, the polymer synthetic resin film having fine continuous pores is further coated with one or more layers. A fixing device characterized in that a polymer synthetic resin film having fine continuous pores is laminated, and an anti-offset liquid is supplied to the 10th la through the laminated polymer synthetic resin film having fine continuous pores. 2. The fixing device according to claim 1, wherein the stretching directions of two of the laminated polymer synthetic resin films having fine pores are crossed. 3. The polymer synthetic resin membrane having fine pores is provided in claim 1, in which each stretching direction is the same.
Fixing device as described in section. 4. Claim 1, wherein the polymer synthetic resin membrane having fine continuous pores is a fluororesin membrane having fine continuous pores.
The fixing device according to any one of items 1 to 3. 5. The fixing device according to claim 4, wherein the polymer synthetic resin film having fine continuous pores is a tetrafluoroethylene resin film having fine continuous pores. 6 A fixing device that fixes a toner image by holding and conveying a toner image support material between the first and 20th rollers, the supply rotating body for supplying offset prevention liquid to the first roller has fine continuous pores. In the fixing device, the fixing device has an applicator that brings into contact with the polymer synthetic resin film having the fine continuous pores and supplies an anti-offset liquid to the first roller through the film. Further, one or more layers of polymer synthetic resin membranes having fine continuous pores are laminated, and the anti-offset liquid is supplied to the supply rotating body through the laminated polymer synthetic resin membrane having fine continuous pores. Fixing device. 7. The fixing device according to claim 6, wherein the stretching directions of at least two of the laminated polymer synthetic resin films having fine pores are crossed. 8. The laminated polymer synthetic resin membranes having fine pores are each stretched in the same direction as claimed in claim 6.
Fixing device as described in section. 9. Claim 6, wherein the polymer synthetic resin membrane having fine continuous pores is a fluororesin membrane having fine continuous pores.
The fixing device according to any one of items 8 to 8. 10. The fixing device according to claim 9, wherein the polymer synthetic resin film having fine continuous pores is a tetrafluoroethylene resin film having fine continuous pores.