JP4385572B2 - Fixing device - Google Patents

Fixing device Download PDF

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Publication number
JP4385572B2
JP4385572B2 JP2002190782A JP2002190782A JP4385572B2 JP 4385572 B2 JP4385572 B2 JP 4385572B2 JP 2002190782 A JP2002190782 A JP 2002190782A JP 2002190782 A JP2002190782 A JP 2002190782A JP 4385572 B2 JP4385572 B2 JP 4385572B2
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Japan
Prior art keywords
portion
endless belt
member
pressure
uneven portion
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JP2002190782A
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Japanese (ja)
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JP2004037552A (en
Inventor
康之 小林
博史 為政
大 竹井
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富士ゼロックス株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing device that heats and fixes an unfixed toner image in an image forming apparatus such as a copying machine, a printer, or a facsimile that employs an electrophotographic method, and in particular, presses an endless belt on a fixing member having a heating source. The present invention relates to an improvement in a member that covers the pressure member in order to reduce sliding resistance between the endless belt and the pressure member in a belt nip type fixing device that is pressed by a member.
[0002]
[Prior art]
Conventionally, various types of fixing devices that heat and fix unfixed toner images in image forming apparatuses such as copiers, printers, and facsimiles that employ the electrophotographic method have been proposed. It has been commercialized. As such a fixing device, for example, there is a belt nip type in which an endless belt is pressed against a fixing roll having a heating source by a pressure member.
[0003]
As this belt nip type fixing device, for example, as disclosed in Japanese Patent Laid-Open No. 10-319772 proposed by the present applicant, a heating layer having an elastic layer near the surface and rotatably supported. A fixing roll, an endless belt having an outer peripheral surface pressed against the heat fixing roll, and forming a nip where a recording sheet carrying a toner image is sandwiched between the heat fixing roll, and an inner surface side of the endless belt A pressure member provided with a pressure contact surface that presses the endless belt along the surface of the heat fixing roll, and a low pressure covering the pressure member to reduce sliding resistance between the pressure member and the endless belt. In a fixing device equipped with a friction sheet, a metal rod is disposed at the tip of the rubber constituting the pressure member to prevent the pressure contact pressure at the tip of the rubber constituting the pressure member from becoming weak. ,image Those configurations are commercialized to prevent image failure such as is.
[0004]
Further, as the belt nip type fixing device, as disclosed in Japanese Patent Laid-Open No. 2002-148970 proposed by the present applicant, the low friction sheet is provided with embossed irregularities, There has also been proposed a technique in which the contact area with the endless belt is reduced to prevent wear and the sliding resistance is reduced.
[0005]
[Problems to be solved by the invention]
However, the conventional technique has the following problems. That is, in the fixing devices disclosed in Japanese Patent Laid-Open Nos. 10-3197772 and 2002-148970, when the thickness of the endless belt is reduced, the surface pressure is high in the pressure portion of the pressure member. There is a problem in that an embossed uneven trace (streak) appears in the image at the time of double-sided printing in the rod portion.
[0006]
In addition, in order to suppress such problems, when the embossed unevenness of the rod portion with high surface pressure is lowered, the low friction sheet sticks to the endless belt, so that the sliding resistance of the low embossed portion increases, An increase in the sliding load (motor current value) for rotationally driving the fixing roller causes a speed difference between the fixing roller and the endless belt, resulting in image quality problems such as image displacement. Was.
[0007]
Furthermore, when the embossed unevenness of the rod part with high surface pressure is lowered, the surface pressure of the low embossed part decreases too much, causing image quality problems such as image displacement. It was.
[0008]
Accordingly, the present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide an emboss-like shape at the time of double-sided printing in a belt nip type fixing device due to unevenness of a low friction sheet. It is an object of the present invention to provide a fixing device capable of preventing the occurrence of traces (streaks) of unevenness in the image and image quality failure such as image shift.
[0009]
[Means for Solving the Problems]
That is, the invention according to claim 1 is a heating fixing member having a heating source;
An endless belt that forms a nip portion in which an outer peripheral surface is pressed against the heat fixing member and a recording medium carrying a toner image is sandwiched between the heat fixing member;
The endless belt is in contact with the inner surface of the endless belt, presses the endless belt along the surface of the heat fixing member, and increases the pressure applied to the other end of the heat fixing member on the downstream side in the rotation direction. Pressing member,
In a fixing device including a low friction sheet covering the pressure member in order to reduce sliding resistance between the pressure member and an endless belt,
A high concavo-convex portion in which a large concavo-convex portion is formed on a surface located on the upstream side in the rotation direction of the heat fixing member, the region being located at least in the pressure portion of the pressure member of the low friction sheet, and the heat fixing Located on the downstream side of the rotation direction of the member, provided with a low uneven portion formed with a small unevenness than the high uneven portion or formed flat ,
When the height of the low uneven portion is set to be smaller than the thickness of the endless belt and the height of the high uneven portion is 150 μm, the heat fixing member is rotated downstream from the boundary between the high uneven portion and the low uneven portion. When the distance to the end on the side is set to 1.5 to 6.5 mm and the height of the low uneven portion is 0 μm, the heat fixing member is rotated downstream from the boundary between the high uneven portion and the low uneven portion. The fixing device is characterized in that the distance to the end on the side is set to 0 to 2.5 mm .
[0010]
Thus, by forming large irregularities on the surface of the low friction sheet, the contact point between the low friction sheet and the inner surface of the endless belt is reduced, and by making point contact, the low friction sheet and the inner surface of the endless belt are This is for reducing sliding resistance. Further, when a lubricant such as oil is applied to the inner surface of the endless belt, there is also an effect of retaining the lubricant such as oil on the unevenness of the surface of the low friction sheet. From this point also, the inner surface of the low friction sheet and the endless belt The effect of reducing the sliding resistance is obtained.
[0011]
By forming large irregularities on the surface of the low friction sheet as described above, the sliding resistance between the low friction sheet and the inner surface of the endless belt can be reduced, but when the low friction sheet is formed of metal. The metal low friction sheet may cause wear on the contact surface with the roll that stretches the endless belt. When the metal wear powder is transferred to the surface of the heat fixing member, the surface of the heat fixing member may be damaged, resulting in image quality defects.
[0012]
Therefore, by forming the low friction sheet from a synthetic resin material having heat resistance and wear resistance, it is possible to prevent wear on the contact surface with the roll on which the endless belt is stretched.
[0013]
According to a second aspect of the present invention, in the fixing device according to the first aspect, the low unevenness portion of the low friction sheet is disposed in a portion where the pressing surface pressure of the pressing member is high. .
[0014]
Furthermore, the invention according to claim 3 is characterized in that the portion where the pressing surface pressure of the pressing member is high is a portion where a metal rod is attached to the pressing member. It is a fixing device.
[0015]
Furthermore, the invention described in claim 4 is the fixing device according to any one of claims 1 to 3, wherein the height of the unevenness of the uneven portion is at least equal to or less than the thickness of the endless belt. is there.
[0016]
In the invention according to claim 5, the height of the unevenness of the uneven portion is at least equal to or less than the thickness of the endless belt, and the portion where the pressing surface pressure of the pressing member is high is The length L from the most downstream portion to the boundary between the low concavo-convex portion and the high concavo-convex portion is set to 2.5 mm or less, and is set to the most downstream portion in the endless belt moving direction. The fixing device described.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
FIG. 2 is a block diagram showing the fixing device according to Embodiment 1 of the present invention.
[0019]
The fixing device 1 is in contact with a heat fixing roll 2 having a built-in heat source, an endless belt 3 stretched between three support rolls and pressed against the heat fixing roll 2, and an inner surface side of the endless belt 3. The main part is composed of a pressure member 4 that presses the endless belt 3 along the surface of the heat fixing roll 2.
[0020]
In FIG. 2, reference numeral 2 denotes a heat-fixing roll. The heat-fixing roll 2 is rotationally driven at a predetermined speed, for example, a peripheral speed of 260 mm / sec, along an arrow direction by a drive source (not shown). ing. The heat fixing roll 2 includes a metal core 5 formed in a cylindrical shape having an outer diameter of 62 mm, an inner diameter of 55 mm, and a length of 350 mm, for example, and the metal core 5 is made of, for example, aluminum or stainless steel. Is used. The surface of the metal core 5 is coated with an HTV silicone rubber (JIS-A rubber hardness of 45 degrees) to a thickness of 2 mm as the elastic body layer 6. On the surface of the elastic body layer 6, Further, the topcoat layer 7 is dip-coated with fluoro rubber to a thickness of 50 μm, and the surface of the topcoat layer 7 is finished in a state close to a mirror state. The rubber hardness of the base elastic body layer 5 is a value obtained by measuring a load of 1,000 gf with a spring type A type hardness tester manufactured by Teclock in accordance with JIS K6301. The metal core 5 can be made of a metal having high thermal conductivity other than aluminum or stainless steel, and the top coat layer 7 can be made of any other elastic body having high heat resistance. Material can be used.
[0021]
In addition, a halogen lamp 8 with an output of 1000 W is disposed inside the metal core 5 as a heating source, and the heat fixing roll 2 is heated from the inside by the halogen lamp 8 so that the surface temperature becomes a predetermined temperature. It has come to be. The surface temperature of the heat-fixing roll 2 is detected by a temperature sensor 9 that contacts the surface of the heat-fixing roll 2, and is controlled by a temperature controller (not shown) so that the surface temperature of the heat-fixing roll 2 is 175 ° C., for example. It is comprised so that.
[0022]
Further, an amine-modified silicone oil viscosity of 300 cs as a release agent is uniformly supplied to the surface of the heat fixing roll 2 by a release agent supply device 10. In this release agent supply device 10, the release agent 12 dropped from the oil pipe 11a is supplied to the pickup roll 11c via the oil wick 11b, and the excess release agent 12 supplied to the pickup roll 11c. Is scraped off by the metering blade 11d and returned from the oil pan 11e to an oil tank (not shown). Further, the release agent 12 supplied to the surface of the pickup roll 11c is applied to the surface of the heat fixing roll 2 via the donor roll 11f. In addition, deposits on the surface of the pickup roll 11c are removed by the cleaning blade 11g. The surface of the heat fixing roll 2 is provided with an external heating roll 13 that heats the surface of the heat fixing roll 2 from the outside at a predetermined timing.
[0023]
A heat-resistant endless belt 3 is disposed on the surface of the heat fixing roll 2 so as to be in pressure contact over a predetermined nip width. The endless belt 3 is formed of, for example, a polyimide film having a thickness of 75 μm, a width of 40 mm, and a circumference of 214 mm, and the surface thereof is coated with a fluororesin. The fluororesin is not particularly limited as long as it has heat resistance, toner releasability, and abrasion resistance, but PFA (tetrafluoroethylene-perfluoroalkoxy-vinyl ether copolymer) is based on the following three viewpoints and handling. preferable. The endless belt 3 is stretched by three rolls 15, 16, and 17 with a tension of about 5 kgf. The diameters of the three rolls 15, 16, and 17 are set to 23 mm, 18 mm, and 18 mm, respectively, for example. Of the three rolls 15, 16, and 17, the pressure roll 15 and the inlet roll 16 are formed in a crown shape by, for example, stainless steel, and the steering roll 17 has a silicon rubber coat on the surface. It is formed into a cylindrical or columnar member by applied stainless steel or the like.
[0024]
The pressure roll 15 is disposed at the exit of the belt nip so as to be in pressure contact with the surface of the heat fixing roll 2 with a pressure of 60 kgf, for example. The endless belt 3 is configured to be driven and rotated while being in pressure contact with the heat fixing roll 2. For this reason, the elastic layer 6 of the heat fixing roll 2 is deformed, a strain ε is generated on the surface thereof, and the recording medium can be peeled by its own rigidity. In the figure, reference numeral 18 denotes a halogen lamp for heating the endless belt 3 disposed as needed inside the inlet roll 16. Reference numeral 19 denotes a recording medium such as a recording sheet carrying the unfixed toner image 20.
[0025]
Further, a pad member 4 as a pressure member for pressing the endless belt 3 against the surface of the heat fixing roll 2 with a predetermined pressure is disposed between the roll 15 and the roll 16. As shown in FIG. 2, the pad member 4 has a base plate 21 made of a metal such as stainless steel, and a support plate made of a metal such as stainless steel via a shim 22 made of a synthetic resin such as polyphenylene sulfide (PPS). An elastic body layer 24 made of rubber or the like laminated on 23 is arranged. In order to increase the pressure applied to the tip of the elastic layer 24 at the tip of the elastic layer 24 (end on the downstream side in the rotation direction of the heat fixing roll), a metal rod having a circular cross section is provided. 24 is provided integrally.
[0026]
The entire surface of the pad member 4 is covered with a pad sheet 25 as a low friction sheet. The support plate 23 on which the elastic body layer 24 is laminated is fixed to the base plate 21 via shims 22 by mounting screws 26 provided at both ends in the longitudinal direction. Further, the pad member 4 is pressed against the heat fixing roll 1 with a pressing force of, for example, 50 kgf by a compression coil spring (not shown) disposed on the base plate 21 side. As the base plate 21, for example, a stainless steel plate having a width (running direction of the belt) of 20 mm, a length (vertical direction of the paper) of 360 mm, and a thickness of 7.5 mm is used. The elastic layer 24 is made of a silicone sponge (silicone rubber foam) having a rubber hardness of 20 ° and a thickness of 5 mm. Here, the rubber hardness is a result of measurement by adding a load of 300 gf with an Asker C type sponge rubber hardness meter manufactured by Kobunshi Kagaku.
[0027]
Here, by providing the pad member 4 with the elastic layer 24, the contact surface of the pad sheet 25 that contacts the endless belt 3 can be aligned with the outer peripheral surface of the heat fixing roll 2. That is, when the pad member 4 is pressed toward the heat fixing roll 2 with a load of a certain level or more, the elastic layer 24 is deformed and the contact surface of the pad sheet 25 is pressed along the outer peripheral surface of the heat fixing roll 2. It is designed to be deformed as follows. Therefore, when the pad member 4 is pressed against the heat fixing roll 2 by a compression coil spring (not shown), the endless belt 3 is pressed against the heat fixing roll 2 without a gap. Further, a metal rod 40 is provided at the tip of the elastic layer 24 so as to increase the pressure applied to the tip of the elastic layer 24.
[0028]
Further, as shown in FIGS. 2 and 3, an amine-modified silicone oil having a viscosity of 300 cs is applied to the inner surface of the endless belt 3 by a lubricant application member 27 made of felt or the like, As a result, the friction coefficient between the endless belt 3 and the pad sheet 25 is reduced. When the amine-modified silicone oil is applied, the endless belt 3 can run at the same speed as the heat fixing roll 2 while sliding on the pad sheet 25 as the heat fixing roll 2 rotates. It has become.
[0029]
By the way, in this embodiment, a heat fixing member having a heat source and an outer peripheral surface are pressed against the heat fixing member to form a nip portion where a recording medium carrying a toner image is sandwiched between the heat fixing member. An endless belt, a pressure member that is in contact with an inner surface of the endless belt and presses the endless belt along the surface of the heat fixing member, and a sliding resistance between the pressure member and the endless belt is reduced. In a fixing device including a low friction sheet that covers the pressure member, a high uneven portion having a large unevenness formed on a surface in a region located in at least the pressure portion of the pressure member of the low friction sheet; An unevenness smaller than the high unevenness portion is formed, or a low unevenness portion formed flat is provided.
[0030]
Further, in this embodiment, the low unevenness portion of the low friction sheet is arranged in a portion where the pressing surface pressure of the pressing member is high.
[0031]
Furthermore, in this embodiment, the height of the unevenness of the uneven portion is configured to be at least equal to or less than the thickness of the endless belt.
[0032]
That is, in this embodiment, as shown in FIGS. 2 and 3, the surface of the pad member 4 as the pressurizing member is covered with the pad sheet 25 as a low friction sheet. The pad sheet 25 is formed in a substantially cylindrical shape by a film made of a synthetic resin having heat resistance and wear resistance such as a polyimide film having a thickness of about 75 μm. Any material can be used for the pad sheet 25 as long as it has heat resistance and wear resistance. Examples of the material for forming the pad sheet 25 include polyimide (PI), polybenzimidazole (PBI), polybenzoxazole (PBO), polyamideimide (PAI), polyetheretherketone (Peek), and the like.
[0033]
Further, on the surface of the pad sheet 25, there are provided a high embossed portion 25a as a high uneven portion having large uneven portions 28 and a low embossed portion 25b as a flat low uneven portion having no uneven portions. It has been. The large unevenness 28 on the surface of the pad sheet 25 is formed, for example, by subjecting the surface of the sheet material constituting the pad sheet 25 to the special embossing or sanding.
[0034]
In this way, by forming large irregularities 28 on the surface of the pad sheet 25, the contact points between the pad sheet 25 and the inner surface of the endless belt 3 are reduced, and by making point contact, the pad sheet 25 and the endless belt 3 are contacted. This is to reduce sliding resistance with the inner surface.
[0035]
More specifically, for example, as shown in FIG. 5, the pad sheet 25 is pressed by using an embossing mold 32 for embossing having irregularities 31 of a predetermined size on a polyimide film 30 having a thickness of 75 μm. By performing embossing, large irregularities are formed on the surface of the pad sheet 25.
[0036]
Further, in this embodiment, as shown in FIG. 1, the high embossed portion 25a on the surface of the pad sheet 25 is disposed in the pressure contact portion between the heat fixing roll 2 and the pressure member. The low embossed portion 25b is disposed at a portion where the pressing surface pressure corresponding to the made rod 40 is high. Here, the low embossed portion 25b is a flat portion not provided with irregularities.
[0037]
Experimental example 1
By the way, the present inventors made a prototype of a fixing device as shown in FIGS. 2 to 4 and used a device in which the thickness of the endless belt 3 and the height of the unevenness of the low embossed portion 25b of the pad sheet 25 were changed. An experiment was conducted to check whether or not the uneven traces (streaks) of the pad sheet 25 appear on the image on the back side of the paper during duplex printing.
[0038]
FIG. 6 shows the results of the above experiment.
[0039]
As is apparent from FIG. 6, in the case of the endless belt 3 having a thickness of 115 μm, if the height of the unevenness of the low embossed portion 25b is 100 μm, which is substantially equal to the thickness of the endless belt 3, When the back surface of the paper does not show the traces (streaks) of the unevenness of the pad sheet 25 on the image, if the height of the unevenness of the low embossed portion 25b is 150 μm thicker than the thickness of the endless belt 3, double-sided printing Occasionally, irregularities (streaks) of the pad sheet 25 appeared on the back surface of the paper, and it was found impossible. Therefore, it is desirable to set the height of the unevenness of the low embossed portion 25 b of the pad sheet 25 to be smaller than the thickness of the endless belt 3.
[0040]
Further, as is apparent from FIG. 6, in the case of the endless belt 3 having a thickness of 250 μm, the height of the unevenness of the low embossed portion 25b is 100 μm or 150 μm. On the back surface, it was found that the uneven marks (streaks) of the pad sheet 25 did not appear on the image, and it was OK.
[0041]
Experimental example 2
Next, the inventors made a prototype of the fixing device as shown in FIGS. 2 to 4, and the height of the low embossed portion 25b of the pad sheet 25 and the height of the low embossed portion 25b as shown in FIG. Whether or not the traces (streaks) of the irregularities of the pad sheet 25 appear on the back surface of the paper during double-sided printing using the one that changes the distance L from the boundary with the embossed portion 25a to the end of the metal rod 40 An experiment was conducted to confirm whether or not.
[0042]
FIG. 7 shows the results of this experiment.
[0043]
As is apparent from FIG. 7, if the height of the low embossed portion 25b of the pad sheet 25 is 0 μm and 100 μm, the end portion of the metal rod 40 from the boundary between the low embossed portion 25b and the high embossed portion 25a. Even if the distance L is 0 to 6.5 mm, it was found that the concave and convex traces (streaks) of the pad sheet 25 did not appear on the image on the back surface of the paper during double-sided printing, and it was OK. .
[0044]
On the other hand, as apparent from FIG. 7, when the height of the low embossed portion 25 b of the pad sheet 25 is 150 μm, from the boundary between the low embossed portion 25 b and the high embossed portion 25 a to the end of the metal rod 40. If the distance L is 1.5 mm to 6.5 mm, the concave and convex traces (streaks) of the pad sheet 25 do not appear on the image on the back surface of the paper during double-sided printing, and the low embossed portion is OK. When the distance L from the boundary between 25b and the high embossed portion 25a to the end of the metal rod 40 is 0 to 0.5 mm, the traces (streaks) of the unevenness of the pad sheet 25 on the back surface of the paper during double-sided printing. Appeared on the image and found impossible.
[0045]
Experimental example 3
Further, the inventors made a prototype of the fixing device as shown in FIGS. 2 to 4 and made a metal from the height of the low embossed portion 25b of the pad sheet 25 and the boundary between the low embossed portion 25b and the high embossed portion 25a. An experiment was performed to confirm whether or not an image quality failure due to image shift occurred using a rod whose distance L to the end of the rod 40 was changed. Whether or not an image shift image quality failure has occurred is observed by visual observation. If no image shift image quality failure has occurred, the image shift image quality failure has occurred. The case where it was difficult was marked with Δ, the case where it was clearly visible was marked with ×, and the judgment was only marked with ○.
[0046]
FIG. 8 shows the results of the above experiment.
[0047]
As is clear from FIG. 8, if the height of the low embossed portion 25b of the pad sheet 25 is 100 μm and 150 μm, the end portion of the metal rod 40 from the boundary between the low embossed portion 25b and the high embossed portion 25a. It was found that the image quality failure due to image shift did not occur even when the distance L was 0 to 6.5 mm, and it was OK.
[0048]
On the other hand, as apparent from FIG. 8, when the height of the low embossed portion 25 b of the pad sheet 25 is 0 μm, from the boundary between the low embossed portion 25 b and the high embossed portion 25 a to the end of the metal rod 40. If the distance L is 0 mm to 2.5 mm, image quality failure due to image shift does not occur, but the distance L from the boundary between the low embossed portion 25 b and the high embossed portion 25 a to the end of the metal rod 40 is If it is 3 mm, it is difficult to visually recognize, but an image quality failure due to image shift has occurred, and the distance L from the boundary between the low embossed portion 25 b and the high embossed portion 25 a to the end of the metal rod 40 is When it was 4.5 mm to 6.5 mm, an image quality failure such as an image shift occurred to such an extent that it could be clearly seen by visual observation, which was impossible.
[0049]
Experimental Example 4
Further, the inventors made a prototype of a fixing device as shown in FIGS. 2 to 4, and fixed the height of the low embossed portion 25b of the pad sheet 25 to 0 mm, and the low embossed portion 25b and the high embossed portion 25a. An experiment was carried out to confirm how the current value of the drive motor that rotationally drives the heat fixing roll 2 changes using a variable distance L from the boundary to the end of the metal rod 40. .
[0050]
FIG. 9 shows the results of the above experiment.
[0051]
As is clear from FIG. 9, when the height of the low embossed portion 25 b of the pad sheet 25 is 0 mm, the distance from the boundary between the low embossed portion 25 b and the high embossed portion 25 a to the end of the metal rod 40. If L is less than 0 to 4.5 mm, the current value of the drive motor that rotationally drives the heat-fixing roll 2 can be set to 0.85 A or less at which an image shift due to an increase in sliding resistance occurs. all right.
[0052]
【The invention's effect】
As described above, according to the present invention, in the belt nip type fixing device, due to the unevenness of the low-friction sheet, embossed uneven marks (streaks) appear on the image during double-sided printing, and image quality such as image displacement It is possible to provide a fixing device capable of preventing the occurrence of a failure.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a main part of a fixing device according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a fixing device according to an embodiment of the present invention.
FIG. 3 is a block diagram showing a main part of a fixing device according to an embodiment of the present invention.
FIG. 4 is a perspective configuration diagram showing a pad sheet of a fixing device according to an embodiment of the present invention.
FIG. 5 is an explanatory view showing a pad sheet processing method of the fixing device according to the embodiment of the present invention.
FIG. 6 is a graph showing experimental results.
FIG. 7 is a chart showing experimental results.
FIG. 8 is a chart showing experimental results.
FIG. 9 is a graph showing experimental results.
[Explanation of symbols]
1: fixing device, 2: heat fixing roll, 3: endless belt, 4: pressure member, 25: pad sheet (low friction sheet).

Claims (5)

  1. A heat fixing member having a heating source;
    An endless belt that forms a nip portion in which an outer peripheral surface is pressed against the heat fixing member and a recording medium carrying a toner image is sandwiched between the heat fixing member;
    The endless belt is in contact with the inner surface of the endless belt, presses the endless belt along the surface of the heat fixing member, and increases the pressure applied to the other end of the heat fixing member on the downstream side in the rotation direction. Pressing member,
    In a fixing device including a low friction sheet covering the pressure member in order to reduce sliding resistance between the pressure member and an endless belt,
    A high concavo-convex portion in which a large concavo-convex portion is formed on a surface located on the upstream side in the rotation direction of the heat fixing member, the region being located at least in the pressure portion of the pressure member of the low friction sheet, and the heat fixing Located on the downstream side of the rotation direction of the member, provided with a low uneven portion formed with a small unevenness than the high uneven portion or formed flat ,
    When the height of the low uneven portion is set to be smaller than the thickness of the endless belt and the height of the high uneven portion is 150 μm, the heat fixing member is rotated downstream from the boundary between the high uneven portion and the low uneven portion. When the distance to the end on the side is set to 1.5 to 6.5 mm and the height of the low uneven portion is 0 μm, the heat fixing member is rotated downstream from the boundary between the high uneven portion and the low uneven portion. A fixing device characterized in that the distance to the end on the side is set to 0 to 2.5 mm .
  2. The fixing device according to claim 1, wherein a low uneven portion of the low friction sheet is disposed in a portion where the pressing surface pressure of the pressing member is high.
  3. The fixing device according to claim 2, wherein the portion where the pressure surface pressure of the pressure member is high is a portion where a metal rod is attached to the pressure member.
  4. The fixing device according to claim 1, wherein a height of the unevenness of the uneven portion is at least equal to or less than a thickness of the endless belt.
  5. The height of the unevenness of the uneven portion is at least equal to or less than the thickness of the endless belt, and the portion where the pressing surface pressure of the pressing member is high is set as the most downstream portion of the pressing member in the endless belt moving direction. The fixing device according to claim 1, wherein a length L from the most downstream portion to a boundary between the low uneven portion and the high uneven portion is set to 2.5 mm or less.
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JP5268423B2 (en) * 2008-05-09 2013-08-21 キヤノン株式会社 Image heating device
JP5477138B2 (en) * 2010-04-19 2014-04-23 コニカミノルタ株式会社 Fixing apparatus and image forming apparatus
JP5278567B2 (en) 2012-01-23 2013-09-04 富士ゼロックス株式会社 Sliding member for fixing device, fixing device, and image forming apparatus
WO2017111278A1 (en) 2015-12-22 2017-06-29 S-Printing Solution Co., Ltd. Fixing device and image forming apparatus including the same
JP2019132969A (en) 2018-01-31 2019-08-08 ブラザー工業株式会社 Fixation device
JP2019135523A (en) 2018-02-05 2019-08-15 ブラザー工業株式会社 Fixing device

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