JP2012155067A - Fixing device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device and an image forming apparatus that properly controls a feeding amount of a cleaning web to prevent generation of image stain due to offset toner and suppress useless consumption of the cleaning web.SOLUTION: An image forming apparatus has feeding amount control for a cleaning web including: reading data of an output image during printing (S2); determining the presence or absence of isolation pixels (S3); when the isolation pixels do not exist, setting a web feeding amount to standard setting (S4); when the isolation pixels exist, calculating a blackening rate Y of the isolation pixels by an image data arithmetic section (S5); calculating a sub-scanning length X in which the isolation pixels exist (S6); calculating the web feeding amount based on the calculated sub-scanning length X and blackening rate Y by the image data arithmetic section; in the embodiment, referring to the web feeding amount corresponding to the blackening rate Y of the isolation pixels using a table (S7); and determining a feeding time of a motor for feeding the cleaning web (S8).

Description

  The present invention relates to a fixing device that fixes an unfixed image on a recording medium, and an image forming apparatus including the fixing device.

  In image forming apparatuses such as copiers, printers, and facsimiles using an electrophotographic system, fixing is performed by a heat source such as a halogen lamp as a technique used for fixing a toner image on a recording medium such as paper. A recording medium carrying a toner image is passed through a nip formed by a fixing member such as a roller or a fixing belt and a pressure roller that rotates while being in pressure contact with the fixing member, and the toner image is fixed to the recording medium. The thermocompression bonding method is widely adopted. In this type of fixing, the toner image is melted by being heated by the fixing member when the recording medium carrying the toner image is pressed against the fixing member by a pressure roller with a predetermined pressure. Although it is desirable that all of the melted toner is fixed on the recording medium, in reality, a small part of the toner adheres to the fixing member due to the adhesive force between the toner and the fixing member. In general, this phenomenon is called an offset phenomenon.

  The types of offset phenomenon include a low temperature offset and a high temperature offset. Low temperature offset means that the toner is not sufficiently heated and the heat is not sufficiently transferred to the inside of the toner layer forming the toner image, so that the toner is not completely melted and fused to the recording medium. A part of the toner layer is crushed and adhered to the fixing member. In this case, since the toner image is not sufficiently fused to the recording medium, a so-called fixing failure occurs in which the toner image can be easily scraped from the output copy. High temperature offset means that when the toner is heated at an unnecessarily high temperature, the viscoelasticity of the toner changes and the adhesion between the toner and the fixing member becomes higher than the cohesive force of the toner particles, and the toner adheres to the fixing member. It is.

  On the other hand, for copy images output by an electrophotographic image forming apparatus, there is an increasing demand for higher image quality. In order to ensure the print quality equivalent to the offset image, the trend is to reduce the diameter of the toner or make it spherical like a polymerized toner. For this reason, compared to conventional toners, heat is not easily transmitted to the toner, and the melting is not sufficient, so that there is a problem that low temperature offset is likely to occur. In particular, it tends to occur when the paper surface is uneven, such as uncoated paper.

  As a countermeasure to this problem, it is common practice to provide a fixing cleaning means that presses a cleaning web such as a nonwoven fabric on the fixing member with a pressing roller so as to always wipe the surface of the fixing member (for example, JP, 2002-258657, A: Refer to patent documents 1).

  However, spherical and small-diameter toner tends to pass through a slight gap formed between the cleaning web and the fixing member. To prevent this, a new portion of the cleaning web to which no toner is attached is always passed through the fixing member or the pressure roller. It is necessary to prevent the gaps from being generated as much as possible by pressing. However, it is not desirable to supply a cleaning web having a sufficient area each time a copy is output from the viewpoint of increasing the maintenance frequency of the image forming apparatus or increasing waste from an environmental viewpoint.

  For this reason, Japanese Patent Laid-Open No. 2005-024619 (Patent Document 2) proposes a cleaning means that can prevent unnecessary web supply by controlling the supply amount of the cleaning web based on image data. . However, in Patent Document 2, the web feed amount is increased as the image data (= toner image area / image area) increases. However, the image data amount and the offset amount are not necessarily proportional to each other. In the control method of Literature 2, control with an optimum feed amount cannot be realized.

  The present invention solves the above-described problems in the conventional fixing device, appropriately controls the cleaning web feed amount to prevent occurrence of image smear due to offset toner, and suppresses wasteful consumption of the cleaning web. It is an object of the present invention to provide a fixing device and an image forming apparatus that can be used.

  According to the present invention, there is provided a fixing nip formed between the fixing member and the pressure member, the fixing member having a fixing member heated by the heating unit and a pressure member pressed against the fixing member. In a fixing device for fixing an image by passing a recording medium carrying an unfixed image, the image forming apparatus includes a cleaning unit that sends a cleaning web to clean the surface of the fixing member or the pressure member, and feeds the cleaning web Is determined based on the sub-scanning length X of the isolated pixel of the output image obtained from the image data and the blackening rate Y of the isolated pixel.

  Further, it is preferable that the cleaning web feed amount when the blackening rate Y of the isolated pixel is greater than 35% and 45% or less than the cleaning web feed amount outside the above range.

Moreover, it is preferable to change the feeding amount of the cleaning web between single-sided printing and double-sided printing.
Further, it is preferable to change the feeding amount of the cleaning web depending on whether the paper to be passed is coated paper or uncoated paper.

In addition, it is preferable that the feed amount of the cleaning web based on X and Y is read and set from a reference table stored in a storage unit.
In addition, it is preferable that a user can change the feeding amount of the cleaning web.

  According to the present invention, the above problem is solved by an image forming apparatus including the fixing device according to any one of claims 1 to 6.

  According to the fixing device and the image forming apparatus of the present invention, the feed amount of the cleaning web is determined based on the sub-scanning length X of the isolated pixel of the output image obtained from the image data and the blackening rate Y of the isolated pixel. Therefore, it is possible to appropriately control the feeding amount of the cleaning web to prevent the occurrence of image smear due to the offset toner, and it is possible to suppress wasteful consumption of the cleaning web.

  According to the configuration of the second aspect, since a large amount of the cleaning web can be fed within the range of the image area ratio with a large amount of offset toner, it is possible to more reliably prevent the occurrence of image contamination due to the offset toner. Further, wasteful consumption of the cleaning web can be suppressed.

  According to the configuration of the third aspect, by changing the feeding amount of the cleaning web during single-sided printing and double-sided printing, it becomes possible to feed the cleaning web by an appropriate amount during each printing, and image smearing due to offset toner occurs. And wasteful consumption of the cleaning web can be suppressed.

  According to the configuration of claim 4, it is possible to feed the cleaning web by an appropriate amount to each paper by changing the feeding amount of the cleaning web between the case where the paper to be passed is coated paper and the case where the paper is not coated. Thus, it is possible to prevent the occurrence of image smearing due to the offset toner and to suppress wasteful consumption of the cleaning web.

  According to the fifth aspect of the present invention, an appropriate web feed amount can be reliably set by reading and setting the cleaning web feed amount from the reference table stored in the storage means. Moreover, control becomes easy.

  According to the configuration of the sixth aspect, since the user can change the feed amount of the cleaning web, it is possible to set an appropriate web feed amount corresponding to variations in environmental conditions and toner adhesion amount. And wasteful consumption of the cleaning web can be suppressed.

FIG. 3 is a cross-sectional view illustrating a main configuration of an example of a fixing device to which the present invention is applied. FIG. 3 is a schematic diagram illustrating a configuration of a driving system of a fixing cleaning unit. 6 is a graph showing a relationship between an image area ratio and a toner offset amount. It is a schematic diagram which shows the example of the image data in which the solid image area and the isolated pixel area were mixed. It is a flowchart which shows control of the feed amount of a cleaning web. 6 is a graph showing a relationship between an image area ratio and a toner offset amount when coated paper and uncoated paper are used. 1 is an external perspective view illustrating an example of an image forming apparatus including a fixing device according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a main configuration of an example of a fixing device to which the present invention is applied. The fixing device of this example shown in this figure is a belt fixing system, and includes a heating roller 1, a fixing belt 2, a fixing roller 3, a pressure roller 4, a tension roller 5, a separating plate 8, a conveying roller pair 9, and a fixing cleaning means 10. These are arranged in a fixing device casing (not shown).

  Inside the heating roller 1 and the pressure roller 4, fixing heaters 6 and 7 such as halogen lamps are disposed as heat sources of the fixing device. The heat source is not limited to the halogen heater, and an IH heating means, a resistance heating element, a carbon heater, or the like can be employed.

  The heating roller 1, the fixing roller 3, and the pressure roller 4 extend in the longitudinal direction of the fixing device casing, and are rotatably supported with respect to the casing. Driving means (not shown) for rotating the fixing roller 3 and fixing heaters 6 and 7 are fixedly held in the fixing device casing. The pressure roller 4 is pressed against the fixing roller 3 with the fixing belt 2 sandwiched by a pressure mechanism (not shown), but the pressure contact with the fixing belt 2 can be released (depressurized) at the time of jam processing or the like. It has become.

  The fixing belt 2 is an endless belt formed of a PI (polyimide) layer having a thickness of 90 μm, and has an outer peripheral surface coated with an offset preventing agent such as a PFA film. The fixing belt 2 is wound around the heating roller 1 and the fixing roller 3 and is heated by the heating roller 1.

  The fixing roller 3 and the pressure roller 4 are rubber rollers arranged to face each other. When the pressure roller 4 is pressed toward the center of the fixing roller 3 via the fixing belt 2, the pressure roller 4 and the fixing roller 4 are fixed. A nip portion (fixing nip) is formed with the belt 2. A pre-fixing guide 15 is disposed on the upstream side of the fixing nip in the sheet conveyance direction. The tension roller 5 applies tension to the fixing belt 2 and is formed of a cylindrical aluminum tube in this example.

  The fixing roller driving means has a motor and a reduction gear train, and is gear-connected to the fixing roller 3 to drive the fixing roller 3 to rotate clockwise in FIG. As the fixing roller 3 rotates, the pressure roller 4 and the fixing belt 2 that are in pressure contact with the fixing roller 3 are driven to rotate at the same speed. The fixing belt 2 is rotated in the clockwise direction in FIG. 1, and the pressure roller 4 is rotated in the counterclockwise direction in FIG.

  In the fixing device configured as described above, heat from the fixing heater 6 disposed inside the heating roller 1 is transmitted to the fixing belt 2 via the heating roller 1 and the fixing belt 2 is heated. By the reverse rotation of the pressure roller 4 and the fixing belt 2, the paper P carrying the toner image T is heated and pressurized at the nip portion, and conveyed while melting the toner. In the fixing device of the present embodiment, the paper P carrying the toner image is conveyed in the direction of the arrow shown in FIG. 1, and the toner image is fixed by heating and melting the toner image on the paper at the nip portion. . Thereafter, the sheet P is separated from the fixing belt by the separation plate 8 after the nip exit, and is discharged out of the fixing device by the transport roller 9 disposed on the downstream side in the sheet transport direction.

  The fixing cleaning means 10 includes a cleaning web 11 in which an aromatic polyamide nonwoven fabric is impregnated with silicone oil as a release agent, a supply roller 12 around which a new web is wound, a take-up roller 13 that collects a used web, The pressure roller 14 is made of foamed silicon resin. A predetermined amount of the cleaning web 11 wound around the winding shaft is fed by the step motor 17 (FIG. 2), and the winding operation is performed with a constant torque. The pressing roller 14 presses the cleaning web 11 against the pressure roller 4 by a support member (not shown) and a pressing spring (not shown). A nip of 3 to 6 mm is formed between the cleaning web 11 and the pressure roller 4 by this pressing, and the toner HT adhering to the surface of the pressure roller due to the offset rotates the pressure roller 4 in the direction of the arrow. Is wiped by the cleaning web 11 at the nip.

FIG. 2 is a schematic diagram showing the configuration of the drive system of the fixing cleaning unit 10.
As shown in this figure, a reduction gear 16 is fixed to the rotation shaft of the step motor 17, and this reduction gear 16 is meshed with a gear 19 fitted to the shaft of the take-up roller 13. Reference numeral 18 denotes a motor control unit. The rotation of the step motor 17 is transmitted to the take-up roller 13 via the gears 16 and 19, and the cleaning web 11 is taken up by the take-up roller 13.

  In such a configuration, the feed amount of the cleaning web 11 is determined by the rotation amount of the take-up roller 13. In this embodiment, the gear reduction ratio is set so that the cleaning web 11 is fed by 0.82 mm by one step rotation of the step motor 17. Further, the step motor 17 is a motor control unit 18 so that a new web is sent out by intermittent control in which the motor operates once for a predetermined number of sheets to be passed for a predetermined time. In the fixing device of the present invention, the feed amount of the cleaning web is controlled (changed) by changing the time for operating the drive motor of the take-up roller.

  Here, the relationship between the image area ratio and the toner offset amount will be described with reference to FIG. The vertical axis of the graph shown in FIG. 3 is the image density of the cleaning web. The larger the value, the more toner adhered to the cleaning web (toner wiped off by the cleaning web), that is, the offset to the pressure roller or fixing roller. There will be a lot of toner. The horizontal axis of the graph is the black rate of isolated pixels (= isolated pixel area / paper area), which is the ratio of the isolated pixel area to the paper area. The larger the value, the more the image area ratio (= toner image area / image area). ) Is high.

  As shown in this graph, when the image area ratio is low (the numerical value on the horizontal axis is small), the amount of offset toner is small because the amount of input toner is small. As the image area ratio increases, the offset toner amount increases. However, when the image area ratio increases to some extent, the offset toner starts to decrease, and the offset toner amount decreases even in a region where the image area ratio is high. This is because when the image area ratio is high, the adhesion force between the toner and the toner is added in addition to the adhesion force between the paper and the toner, resulting in a decrease in the amount of offset toner. For this reason, the pixel region (image area ratio) in the vicinity of 40% where there are some isolated pixels has the largest offset amount. As described above, the image area ratio and the toner offset amount are not proportional to each other, and as the image data (= toner image area / image area) increases as in Patent Document 2 described above, the cleaning web feed amount increases. Even if this is increased, the optimum feeding amount cannot be obtained.

  In view of this, the present invention is characterized in that the feed amount of the cleaning web is determined based on the sub-scanning length X of the isolated pixel and the blackening rate Y of the isolated pixel in the toner image (output image) to be fixed. Yes. That is, among the output image data, the blackening rate Y of the isolated pixel (ratio of the isolated pixel per unit area) is read, and further, the sub-scan length X of the isolated pixel is read to fix the image data. In this case, the amount of offset toner can be appropriately determined to some extent. Therefore, by determining the feeding amount of the cleaning web based on the values of X and Y, it is possible to feed an appropriate amount of the cleaning web and fixing. The offset toner adhering to the member or the pressure member can be reliably wiped off to prevent image smearing, and wasteful consumption of the cleaning web can be suppressed. FIG. 4 shows an example of image data in which a solid image area and an isolated pixel area are mixed.

Hereinafter, specific control of the feeding amount of the cleaning web will be described with reference to the flowchart of FIG.
In the image forming apparatus equipped with the fixing device of FIG. 1, the output image data is read at the time of copying or printing (S2), and it is first determined whether or not the cleaning web feed amount is to be the standard based on the presence or absence of isolated pixels ( S3). When there is no isolated pixel, the web feed amount is a standard setting (S4), and a signal having a pulse number corresponding to the standard setting is sent from the control unit to the fixing cleaning unit having the step motor, and the web motor (step motor 17, 2) is operated. On the other hand, when there is an isolated pixel, the image data calculation unit calculates the blackening rate of the isolated pixel (S5). This calculates the area ratio of isolated pixels per unit area based on the position information of isolated pixels from the image data and the interval between the dot data. Since the size of one pixel is determined in advance, the sub-scanning length X where the isolated pixel exists and the area ratio of the isolated pixel per unit area (blackening rate) are determined based on the position information of the pixel and the data interval of the pixel. ) Y is known (S6). The image data calculation unit calculates the web feed amount from the calculated X and Y. In this embodiment, the web feed amount corresponding to the blackening rate Y of the isolated pixel is referred from the table (S7), and the web feed amount is multiplied by X / 210 mm to determine the web motor feed time (S8). ). Since the web feed amount table (Table 1 below) provides the web feed amount required for A4 paper (one sheet), the actual web feed amount is multiplied by X / 210.

  By determining the feed amount of the cleaning web 11 according to the web feed amount table shown in Table 1, the optimum web feed amount can be set. In other words, the amount of toner input to the cleaning web (the amount of toner offset to the fixing member or the pressure member) is the most when the image data with the isolated pixel blackening ratio Y: 35% <Y ≦ 45% is output. In many cases, it is known that the blackening rate tends to decrease even if the blackening rate increases or decreases. Therefore, in this embodiment, the web feed amount is set to the maximum when the value of Y is 35% <Y ≦ 45%.

  At the time of reverse paper passing during double-sided printing (at the time of fixing the second surface), the already fixed toner on the first surface side is offset on the pressure member side, so that the input toner to the cleaning web increases. Therefore, it is preferable to set the cleaning web feed amount during double-sided printing to be larger than that during single-sided paper feeding. In this embodiment, the feed amount of the cleaning web 11 at the time of duplex printing is set to 1.6 times that at the time of simplex printing. Table 2 below shows the feed amount of the cleaning web 11 for each value of the blackening rate Y of the isolated pixel during single-sided printing and double-sided printing. Note that the feed amount for single-sided printing in Table 2 corresponds to that in Table 1 above.

また、画像形成に用いる用紙種類によってもクリーニングウェブへの入力トナー量は異なってくる。図６に、コート紙と非コート紙を用いた場合の画像面積率とトナーオフセット量の関係を示す。このグラフに示すように、非コート紙の方がコート紙よりもオフセットトナー量が多くなっている。これは、非コート紙に比べ、コート紙は表面が平滑であることから、トナーに対して熱が伝わり易く、オフセット量が少ないためである。したがって、コート紙を用いる際に非コート紙と同程度のウェブ送り量とすると過剰な送り量となってしまう。そこで、本実施形態では、プリント時に画像形成装置の制御部から送信される紙種情報に基づき、非コート紙の場合のクリーニングウェブ１１の送り量をコート紙の０．６倍に設定する。次の表３に、コート紙を用いた場合と非コート紙を用いた場合のクリーニングウェブ１１の送り量を示す。なお、表３の非コート紙の送り量は、上記表１と対応するものである。

Also, the amount of toner input to the cleaning web varies depending on the type of paper used for image formation. FIG. 6 shows the relationship between the image area ratio and the toner offset amount when coated paper and uncoated paper are used. As shown in this graph, the amount of offset toner in uncoated paper is larger than that in coated paper. This is because the coated paper has a smooth surface compared to uncoated paper, so that heat is easily transmitted to the toner and the offset amount is small. Therefore, when the coated paper is used, if the web feed amount is about the same as that of the non-coated paper, the feed amount becomes excessive. Therefore, in the present embodiment, based on the paper type information transmitted from the control unit of the image forming apparatus at the time of printing, the feeding amount of the cleaning web 11 in the case of uncoated paper is set to 0.6 times that of coated paper. Table 3 below shows the feed amount of the cleaning web 11 when coated paper is used and when uncoated paper is used. The feed amount of uncoated paper in Table 3 corresponds to that in Table 1 above.

本発明では、上記ＸとＹの値に基づいてクリーニングウェブの送り量を決定するが、上述したように、実施例では制御部の記憶手段（メモリ等）にあらかじめ格納したウェブ送り量テーブルを参照して、そこからウェブ送り量を読み出すようにしている。

In the present invention, the cleaning web feed amount is determined based on the values of X and Y, but as described above, in the embodiment, the web feed amount table stored in advance in the storage means (memory or the like) of the control unit is referred to. Then, the web feed amount is read from there.

  Moreover, you may comprise so that a user can arbitrarily set the feed amount of a cleaning web (it can change). For example, it is also possible to provide a cleaning web feed amount so that it can be specified (input) from an operation unit (operation panel) provided in the image forming apparatus. With this configuration, even if the web feed amount is known in advance, even if the offset amount increases due to variations in environmental conditions or toner adhesion amount, the user can remove the cleaning web from the operation panel or the like. By designating the feed amount, it is possible to set an optimum web feed amount, prevent image smearing by offset toner (maintain image quality), and suppress wasteful consumption of the cleaning web.

Finally, an example of an image forming apparatus including the fixing device according to the present invention will be briefly described.
The image forming apparatus shown in FIG. 7 is configured as a digital copying machine, and includes a main body unit 310, a paper feeding unit 320, an operation unit 330, a double-sided device 350, and the like. Reference numeral 360 denotes an in-body discharge unit. An automatic document feeder (ADF) 340 is mounted on the top of the copying machine.

  The main body part 310 includes an image forming part. An image reading unit is disposed at the top of the main body 310. The image reading unit used in the digital copying machine of this example is a device having a function of irradiating a document with a light source, converting the reflected light into an electrical signal with a solid-state imaging device such as a CCD, and performing necessary image processing. is there. The image forming unit is an apparatus that forms an image image sent as an electrical signal on a recording medium (transfer paper or the like) by an electrophotographic method, and includes the fixing device described in FIG. Note that an image forming method using an electrophotographic method is well known, and thus the description thereof is omitted.

  As a major feature of the digital copying machine as in this example, an image is converted into an electric signal and read, and the electric signal (image data) is restored by an image forming unit. In the present invention, as described above, among the image data, the blackening rate Y of the isolated pixel is read, the sub-scanning length X of the isolated pixel is read, and the cleaning web feed amount is determined based on the read value. decide. This makes it possible to set an optimal web feed amount, prevent image smearing due to offset toner (maintain image quality), and suppress wasteful consumption of the cleaning web.

  The digital copying machine of this example includes a double-sided device 350 and can form an image on both sides of a sheet. As described above, the cleaning web feed amount during double-sided printing is set to 1.6 times that during single-sided printing.

  The paper feed unit 320 has a plurality of stages of paper feed trays, and different types of paper, for example, uncoated paper and coated paper can be set. The paper type set in each tray is set using the touch panel of the operation unit 330 or input keys. In the digital copying machine of this example, as described above, the cleaning web feed amount for uncoated paper is set to 0.6 times that of coated paper based on the paper type information. Further, when the user changes (specifies) the web feed amount, a necessary instruction is input from the operation unit 330.

  As mentioned above, although this invention was demonstrated by the example of illustration, this invention is not limited to this. For example, the configuration of the fixing device is arbitrary, and is not limited to the belt fixing device, and may be a heat roll method. The heat source is not limited to the halogen heater, but may be an IH heating means, a resistance heating element, a carbon heater, or the like. The fixing cleaning means is not limited to cleaning the pressure member, and may be a cleaning member for the fixing member.

The material, thickness, size, etc. of the cleaning web are arbitrary.
The image data for calculating the feed amount of the cleaning web is not limited to that obtained by reading a document, and may be image data / print data sent from an external device. Therefore, the present invention can be implemented even in an image forming apparatus that does not have an image reading unit.

  The configuration of each part of the image forming apparatus is also arbitrary, and a tandem type, a configuration in which a plurality of developing devices are arranged around one photosensitive member, or a configuration using a revolver type developing device is also possible. The present invention can also be applied to a full color machine using three color toners, a multicolor machine using two color toners, or a monochrome apparatus. Of course, the image forming apparatus is not limited to a copying machine, but may be a printer, a facsimile machine, or a multifunction machine having a plurality of functions.

1 Heating roller 2 Fixing belt (fixing member)
3 Fixing roller 4 Pressure roller (Pressure member)
6, 7 Fixing heater 10 Fixing cleaning means 11 Cleaning web 12 Supply roller 13 Winding roller 14 Pressing roller 17 Step motor 330 Operation unit 350 Double-sided device

JP 2002-258657 A Japanese Patent No. 2005-024619

Claims (7)

A recording medium having a fixing member heated by a heating unit and a pressure member pressed against the fixing member and carrying an unfixed image in a fixing nip formed between the fixing member and the pressure member. In a fixing device that passes through and fixes an image,
A cleaning means for cleaning the surface of the fixing member or the pressure member by sending a cleaning web;
The fixing device, wherein the cleaning web feed amount is determined based on a sub-scanning length X of an isolated pixel of an output image obtained from image data and a blackening rate Y of the isolated pixel.   The cleaning web feed amount when the blackening rate Y of the isolated pixel is greater than 35% and 45% or less is greater than the cleaning web feed amount when out of the range. The fixing device according to 1.   The fixing device according to claim 1, wherein a feed amount of the cleaning web is changed between single-sided printing and double-sided printing.   The fixing device according to any one of claims 1 to 3, wherein the feeding amount of the cleaning web is changed depending on whether the paper to be passed is coated paper or uncoated paper.   The fixing device according to claim 1, wherein the feed amount of the cleaning web based on the X and the Y is read out from a reference table stored in a storage unit and set. .   The fixing device according to claim 1, wherein a feed amount of the cleaning web is provided so as to be changeable by a user. An image forming apparatus comprising the fixing device according to claim 1.

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