JP2014164075A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform uniformizing processing with a first rubbing member 11 of a rubbing unit 1, and perform recovery processing with a second rubbing member 12, so as to suppress image defects in a fixed image, in a fixing device 80 that fixes, to a transfer sheet S carrying an unfixed toner T, a toner image at a nip part formed by a fixing belt 2 and a pressure roller 3; and achieve a compact layout.SOLUTION: In a rubbing unit 1, a first rubbing member 11 and a second rubbing member 12 are pivotally supported on both ends of a rotation arm 13 that is rotated by the rotation drive of a rotation shaft 13a. A drive control unit 1A controls the drive of the first rubbing member 11 and the second rubbing member 12. The drive control unit 1A controls the drive to rotate the rotation shaft 13a and the rotation arm 13. With this configuration, rotation type (revolver type) "switching means" can be provided.

Description

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

  Conventionally, there are fixing devices used in copiers, printers, facsimiles, and multifunctional electrophotographic image forming apparatuses having these functions. As this fixing device, a heating roller type using a heating roller as a fixing member is widely used from a low speed machine to a high speed machine, from a monochrome machine to a color machine. The heating roller is also referred to as “fixing roller”, and the heating roller method is also referred to as “heat fixing roller method”.

  In the heating roller type fixing device, an unfixed toner image is formed by a fixing nip portion formed by a fixing roller maintained at a predetermined temperature and a pressure roller which is a pressure member in contact with the fixing roller. The recording medium is heated and pressurized while being nipped and conveyed. In recent years, as a fixing member, an endless fixing belt is stretched between a heating roller and a fixing roller, and a pressure roller that is a pressure member that presses the fixing roller through the fixing belt is provided. Then, belt fixing devices for fixing a recording medium by heating and pressing at a nip portion between a heated fixing belt and a pressure roller have been proposed and used.

  However, when the recording medium is passed through the fixing device, there is a problem that the surface of the fixing member is damaged due to the passing of paper, and dirt such as paper dust and offset toner is gradually roughened. As a major cause of the scratches, there are burrs at both ends that occur when the recording medium is cut. In particular, when recording media of the same size are continuously fed, both ends of the recording medium of the fixing member, that is, positions where burrs pass are roughened and become damaged. Such fouling or roughness on the surface of the fixing member causes uneven gloss and causes image deterioration. On the other hand, a technique has been proposed in which the fixing member is rubbed to uniformly rough the surface property and suppress abnormal images such as uneven gloss.

  As a technique for recovering the surface property of the fixing member, for example, those disclosed in Japanese Patent Application Laid-Open No. 2011-175067 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2006-259341 (Patent Document 2) are available. The technique of Patent Document 1 uses a rubbing member that rubs the surface of a fixing member to recover local plastic deformation of the fixing member due to dirt on the surface of the fixing member or burrs at both ends that occur when the recording medium is cut. Technology. The technique of Patent Document 2 removes the paper dust accumulated on the surface of the fixing member by bringing the rotary cleaning body into contact with the surface of the fixing member, thereby preventing the occurrence of glossy streaks during image formation. Technology.

  With the technique of Patent Document 1, it is possible to recover local plastic deformation of the fixing member, but it is impossible to prevent a decrease in glossiness and a decrease in separation performance due to the roughening of the fixing member by the rubbing member. In the technique of Patent Document 2, foreign matters such as paper dust accumulated on the surface of the fixing member can be removed. However, local plastic deformation of the fixing member due to burrs at both ends generated when the recording medium is cut. The glossy streaks associated with can not be removed. There is room for improvement in this regard.

  By the way, in the fixing device, the surface property of the first rubbing member having the function of uniformly rubbing the surface property by rubbing the fixing member and the surface property of the fixing member uniformly ruined by the first rubbing member are recovered. It is considered that a second rubbing member is provided. This is a technique for suppressing the occurrence of side effects (decrease in glossiness due to roughening of the fixing member and reduction in separation performance) due to the second rubbing member by the second rubbing member. Thus, when the first rubbing member and the second rubbing member are provided, it is required to make the layout compact.

  The present invention reliably removes local plastic deformation of the fixing member by the first rubbing member, and causes side effects (deterioration of glossiness or separation due to roughening of the fixing member) by the second rubbing member. It is an object to suppress the occurrence of performance degradation. Another object is to make the layout in the fixing device compact while providing the first rubbing member and the second rubbing member.

  The fixing device according to claim 1 is a fixing device capable of transporting a recording medium carrying unfixed toner at a nip portion formed by a fixing member and a facing member and fixing a toner image on the recording medium. A first rubbing member having a function of rubbing the surface of the fixing member by rubbing the fixing member; and a second for recovering the surface of the fixing member roughened by the first rubbing member. A rotary switching unit that switches between a state in which the first rubbing member is slidable on the fixing member and a state in which the second rubbing member is slidable on the fixing member. It is characterized by having.

  According to the fixing device of claim 1, the first rubbing member having a function of roughening the surface of the fixing member and the second rubbing member for recovering the surface property of the roughened fixing member by the first rubbing member are provided. Have. Therefore, local plastic deformation of the fixing member caused by burrs at both ends generated when the recording medium is cut can be reliably removed.

1 is a schematic configuration diagram illustrating an example of an image forming apparatus to which the present invention is applied. 1 is a cross-sectional view of a fixing device according to an embodiment. It is a flowchart which shows a series of control of the fixing belt refresh operation by the drive control part in embodiment. It is sectional drawing of the 1st rubbing member and 2nd rubbing member in embodiment. It is a figure showing the wave | undulation of the surface of the angle polishing layer of the 1st rubbing member in an embodiment, and a 2nd rubbing member.

  Hereinafter, a fixing device and an image forming apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic configuration diagram showing an example of an image forming apparatus to which the present invention is applied. As shown in the figure, a tandem type intermediate transfer type tandem type image forming unit 20 in which a plurality of image forming units 10Y, 10M, 10C, and 10K are arranged in parallel is provided inside the image forming apparatus main body 100. Subscripts Y, M, C, and K attached to the above symbols indicate yellow, cyan, magenta, and black colors, respectively.

  In the image forming apparatus main body 100, an endless belt-shaped intermediate transfer belt 30 is provided near the center. The intermediate transfer belt 30 is wound around a plurality of support rollers 30a, 30b, 30c, 30d and the like so as to be able to rotate and convey clockwise in the drawing. In the illustrated example, a cleaning device 40 for the intermediate transfer belt 30 is provided to the left of the support roller 30d. The cleaning device 40 removes residual toner remaining on the intermediate transfer belt 30 after image transfer.

  On the intermediate transfer belt 30 stretched between the support roller 30a and the support roller 30b, four image forming units 10Y, 10M, 10C, and 10K are arranged side by side along the conveyance direction, and the tandem type image is formed. The formation part 20 is comprised. In the following, “10Y, 10M, 10C, 10K” and the like are abbreviated as “10Y, M, C, K”. The image forming units 10Y, 10M, 10C, and 10K of the tandem-type image forming unit 20 include photoreceptor drums 40Y, 40M, 40C, and 40K that carry toner images of colors of yellow, cyan, magenta, and black. Yes.

  On the tandem image forming unit 20, two exposure devices 50 are provided as shown in FIG. Each exposure device 50 corresponds to two image forming means (10Y and 10M, 10C and 10K), for example, two light source devices and a coupling optical system, a common optical deflector, and two systems of scanning imaging optics. This is an optical scanning type exposure apparatus constituted by a system or the like. The two light source devices are, for example, a semiconductor laser, a semiconductor laser array, or a multi-beam light source, and the common optical deflector is, for example, a polygon mirror. Then, the photosensitive drums 40Y, 40M, 40C, 40K are exposed according to the image information of each color of yellow, cyan, magenta, and black to form an electrostatic latent image.

  The image forming units 10Y, 10M, 10C, and 10K are each provided with a charging device that uniformly charges the photoconductor drums 40Y, 40M, 40C, and 40K prior to the exposure of the photoconductor drums 40Y, 40M, 40C, and 40K. It has been. Further, a developing device that develops the electrostatic latent image formed by the exposure device 50 with toner of each color and a photoconductor cleaning device that removes transfer residual toner on the photoconductor drums 40Y, 40M, 40C, and 40K are provided. Yes. Further, at the primary transfer position where the toner image is transferred from each photoconductor drum 40Y, M, C, K to the intermediate transfer belt 30, each photoconductor drum 40Y, M, C, K is interposed with the intermediate transfer belt 30 interposed therebetween. Primary transfer rollers 60Y, 60M, 60C, and 60K are provided so as to oppose each other.

  Of the plurality of support rollers that support the intermediate transfer belt 30, the support roller 30a is a drive roller that rotationally drives the intermediate transfer belt 30, and is connected to the motor via a drive transmission mechanism (gear, pulley, belt, etc.) not shown. Has been. When a black single color image is formed on the intermediate transfer belt 30, the supporting rollers 30b and 30c other than the driving roller 30a are moved by a moving mechanism (not shown). Accordingly, the yellow, cyan, and magenta photosensitive drums 40Y, 40M, and 40C can be separated from the intermediate transfer belt 30.

  A secondary transfer device 70 is provided on the opposite side of the intermediate transfer belt 30 from the tandem image forming unit 20. In the illustrated example, the secondary transfer device 70 applies a transfer electric field by pressing the secondary transfer roller 30e against the support roller 30d, thereby converting the image on the intermediate transfer belt 30 into a sheet-like sheet as a “recording medium”. Transfer onto transfer paper S.

  Next to the secondary transfer device 70, a fixing device 80 for fixing the transfer image on the transfer paper S is provided. The fixing device 80 includes a rubbing portion 1 described later, a fixing belt 2, a pressure roller 3, a fixing roller 4, and a heating roller 5.

  Then, the transfer paper (recording medium) S on which the image is transferred by the secondary transfer device 70 is conveyed to the fixing device 80 by a conveyance belt 70a supported by two rollers. The fixing device 80 passes the transfer sheet S on which unfixed toner is placed through a nip portion N formed by the fixing belt 2 (and the fixing roller 4) heated by the heating roller 5 and the pressure roller 3, The toner image is fixed on the transfer paper S by applying pressure and heating. Of course, the conveyance belt 70a may be a fixed guide member, a conveyance roller, a conveyance roller, or the like. In the illustrated example, the transfer sheet S is placed under such a secondary transfer device 70 and the fixing device 80 in order to record images on both sides of the transfer sheet S in parallel with the tandem image forming unit 20 described above. A sheet reversing device 90 for reversing and conveying is provided.

  FIG. 2 shows a cross-sectional view of a fixing device 80 according to an embodiment of the present invention. As shown in FIG. 2, the fixing device 80 includes a rubbing portion 1 described later, a fixing belt 2 that is an endless belt as a “fixing member”, and a “pressure member (opposing member)” that is a rotating body. A pressure roller 3, a fixing roller 4, and a heating roller 5 are provided. The fixing belt 2 is stretched around a fixing roller 4 and a heating roller 5, the pressure roller 3 has a pressure halogen heater 3a, and the heating roller 5 has a halogen heater 5a. The fixing roller 4 is pressed with the pressure roller 3 via the fixing belt 2 to form a nip portion N. The fixing belt 2 is heated via the heating roller 5 heated by the halogen heater 5a. The transfer paper (recording medium) S carrying the toner T is guided to the nip N and fixed by being heated and pressurized. The transfer paper S on which the toner T is fixed is separated at the leading end by the first separation plate 6 arranged on the fixing roller 4 side or the second separation plate 7 arranged on the pressure roller 3 side, and discharged to the next process. Is done.

  The fixing roller 4 may have a halogen heater, the fixing belt 2 and the heating roller 5 may not be provided, and the heat source may be an induction heating type. Further, the first separation plate 6 arranged on the fixing roller 4 side and the second separation plate 7 arranged on the pressure roller 3 side may have a configuration of a separation claw. The fixing belt 2 is an endless belt having a multilayer structure in which an elastic layer such as silicone rubber and a release layer are sequentially laminated on a base layer made of PI (polyimide) resin and having a thickness of 90 μm. The elastic layer of the fixing belt 2 has a layer thickness of about 200 μm and is formed of an elastic material such as silicone rubber, fluorine rubber, and foamable silicone rubber. The release layer of the fixing belt 2 has a layer thickness of about 20 μm, and is formed of PFA (tetrafluoroethylene bar fluoroalkyl vinyl ether copolymer resin), polyimide, polyetherimide, PES (polyether sulfide), or the like. Has been. By providing the release layer on the surface layer of the fixing belt 2, the release property (peelability) for the toner (toner image) is ensured.

  The rubbing portion 1 includes a first rubbing member 11, a second rubbing member 12, and a rotating arm 13. The first rubbing member 11 is pressed against the fixing belt 2 with a predetermined pressure during operation. The first rubbing member 11 rotates with a linear speed difference in the forward or reverse direction with respect to the rotation direction of the fixing belt 2, and is caused by burrs at both ends that occur when the transfer paper (recording medium) S is cut. The local plastic deformation of the fixing belt 2 is removed by roughening the fixing belt 2. Further, like the first rubbing member 11, the second rubbing member 12 is pressed against the fixing belt 2 with a predetermined pressure during operation. The second rubbing member 12 rotates with a linear velocity difference in the forward or reverse direction with respect to the rotation direction of the fixing belt 2, and the side effect of the first rubbing member 11, that is, the glossiness due to the roughness of the fixing belt 2. Suppressing the occurrence of degradation and separation performance. The “linear velocity difference” is a difference between the linear velocity in the circumferential direction of the surfaces of the first rubbing member 11 and the second rubbing member 12 and the linear velocity in the circumferential direction of the surface of the fixing belt 2. .

  The first rubbing member 11 and the second rubbing member 12 are pivotally supported at both ends of the rotating arm 13 that is rotated by the rotational drive of the rotating shaft 13a. The rotary shaft 13a is connected to a drive motor (not shown), and the rotary shaft 13a is rotated by the control of the drive control unit 1A as a control means for driving and controlling the drive motor. The drive control unit 1A is a controller composed of a computer, a drive circuit for driving a motor, and the like. Thus, the function of shifting from the slidable state in which the first rub member 11 and the fixing belt 2 are in contact to the slidable state in which the second rub member 12 and the fixing belt 2 are in contact is provided. Have. The rotary arm 13 and the rotary shaft 13a constitute a rotary (revolver type) “switching means”. Further, the drive control unit 1A drives a drive motor (not shown) to rotate and drive the first rubbing member 11 and the second rubbing member 12, respectively. Thus, since the switching means for switching between the state in which the first rubbing member 11 can be rubbed against the fixing belt 2 and the state in which the second rubbing member 12 can be rubbed against the fixing belt 2 is a rotary type, the layout can be changed. It can be made compact.

  FIG. 3 is a flowchart showing a series of controls for the refresh operation of the fixing belt 2 by the drive control unit 1A. First, the first rubbing member 11 is brought into contact with the fixing belt 2 with a predetermined pressure. Next, the first rubbing member 11 and the fixing belt 2 are rotated with a linear speed difference in the forward direction or the reverse direction. As a result, the local plastic deformation of the fixing belt 2 caused by burrs at both ends caused when the transfer paper S is cut is removed by roughening the fixing belt 2. Next, the second rubbing member 12 is brought into contact with the fixing belt 2 with a predetermined pressure by rotating the rotating shaft 13a by the drive motor. Next, the second rubbing member 12 and the fixing belt 2 are rotated with a linear velocity difference in the forward direction or the reverse direction. This suppresses the occurrence of side effects due to the first rubbing member 11 (decrease in glossiness due to roughness of the fixing belt 2 and decrease in separation performance). Finally, the second rubbing member 12 is separated from the fixing belt 2 by rotating the rotating shaft 13a, and the series of operations is completed.

  The process of roughening (smoothing) the fixing belt 2 by the first rubbing member 11 as described above is “homogenizing process”, and the surface property of the fixing belt 2 is recovered by the second rubbing member 12 (more uniform). ) The process is a “recovery process”. In other words, the drive control unit 1A performs the recovery process after performing the equalization process.

  By the way, when the first rubbing member 11 and the second rubbing member 12 are pressed against the fixing belt 2 and operated during image formation, a small amount of offset toner adheres to the first rubbing member 11 and the second rubbing member 12. To do. When a small amount of offset toner adheres, the polishing performance of the first rubbing member 11 and the second rubbing member 12 with respect to the fixing belt 2 is deteriorated, so that the respective functions are lowered. Therefore, as another embodiment, the first rubbing member 11 and the second rubbing member 12 are moved when the image forming apparatus is not in the middle of image formation (for example, when the printing process is stopped).

  For example, the drive control unit 1A monitors a control unit (not shown) of the image forming apparatus, and performs “homogenization processing” by the first rubbing member 11 and “recovery processing” by the second rubbing member 12. It is not performed during image formation by the image forming apparatus, but is performed after the print job of the image forming apparatus is completed. Alternatively, the drive control unit 1A performs the homogenization process by the first rubbing member 11 and the recovery process by the second rubbing member 12 when the execution button is pressed during the down time of the image forming apparatus. “At the time of downtime” is, for example, when the system is stopped due to maintenance or the like (when printing processing is not performed).

  In the embodiment, the surface roughness of the second rubbing member 12 is made smaller than the surface roughness of the first rubbing member 11. The greater the roughness of the surface of the rubbing member, the higher the ability to remove the local plastic deformation of the fixing belt 2 by uniformly roughening the fixing belt 2. On the contrary, the smaller the surface roughness of the rubbing member, the higher the ability to suppress a decrease in glossiness and a decrease in separation performance due to the rubbing of the fixing belt 2 by the rubbing member. That is, since the surface roughness of the first rubbing member 11 is large, the ability to remove local plastic deformation of the fixing belt 2 is high. Further, since the surface roughness of the second rubbing member is small, the ability to suppress a decrease in glossiness and a decrease in separation performance due to the roughness of the fixing belt 2 is enhanced.

  FIG. 4 is a cross-sectional view of the first rubbing member 11 and the second rubbing member 12. In the embodiment, the first rubbing member 11 and the second rubbing member 12 are composed of a core metal 14 and a polishing layer 15. The polishing layer 15 is formed in a state where abrasive grains 15b are dispersed in a binder 15a such as rubber or resin. As a material for the binder 15a, silicone rubber, fluororesin, or the like is used. Further, as the material of the abrasive grains 15b, white alumina, brown alumina, pulverized alumina, light red alumina, green silicon carbide, black silicon carbide, diamond, CBN, or the like is used.

  The polishing layer 15 and the fixing belt 2 are slid by rubbing by rotating the cored bar 14 by a driving motor that rotates. When the fixing belt 2 is rubbed by the abrasive grains 15b protruding from the binder 15a in the polishing layer 15, the first rubbing member 11 performs the homogenization process, and the second rubbing member 12 performs the recovery process. Is done.

  FIG. 5A shows the undulation of the surface of the polishing layer 15 of the first rubbing member 11, and FIG. 5B shows the undulation of the surface of the polishing layer 15 of the second rubbing member 12. For example, even if the abrasive grains 15b dispersed in the binder 15a of the polishing layer 15 are the same, the fixing belt 2 is rougher when the surface waviness of the polishing layer 15 is larger as shown in FIG. Sharpen well. Further, as shown in FIG. 5B, when the surface of the polishing layer 15 has a smaller undulation, the surface of the fixing belt 2 is finer and the surface is smoothly cut.

  The waviness of the surface of the polishing layer 15 of the first rubbing member 11 is increased, and the waviness of the surface of the polishing layer 15 of the second rubbing member 12 is decreased. As a result, the first rubbing member 11 enhances the function of removing local plastic deformation of the fixing belt 2 by uniformly roughening the fixing belt. Further, the second rubbing member 12 has an enhanced function of suppressing the occurrence of side effects (decrease in glossiness due to roughening of the fixing member and degradation in separation performance) due to the first rubbing member 11.

  Further, the smaller the count of the abrasive grains 15b dispersed in the binder 15a of the polishing layer 15 is, the rougher the surface of the fixing belt 2 is, and the lower the count of the abrasive grains 15b is. The surface is fine and the surface can be cut smoothly. Therefore, the count of the abrasive particles 15b dispersed in the binder 15a in the polishing layer 15 of the rubbing member may be larger than that of the first rubbing member 11 with respect to that of the first rubbing member 12. Good. Thereby, the function of the said homogenization process can be improved in the 1st rubbing member 11, and the function of the said recovery process can also be improved in the 2nd rubbing member 12. For example, in this embodiment, the count of the abrasive grains 15b of the first rubbing member 11 is # 1500, and the count of the abrasive grains 15b of the second rubbing member 12 is # 2000. However, the count of the abrasive grains 15b of the first rubbing member 11 and the second rubbing member 12 is optimized depending on the fixing belt (fixing member), rubbing member, and other process conditions at the time of rubbing. You can change it. Further, the undulations on the surface of the polishing layer 15 of the first rubbing member 11 and the second rubbing member 12 may be different from each other, and the counts of the abrasive grains 15b may be different from each other.

  As described above, according to the embodiment, after the surface property of the fixing belt (fixing member) is uniformized by the first rubbing member according to claim 2, the fixing belt of the second rubbing member is used. The surface property recovery treatment is performed. Therefore, it is possible to suppress the occurrence of side effects due to the first rubbing member (decrease in glossiness due to roughening of the fixing belt and reduction in separation performance).

  Further, in accordance with claim 3, the surface of the fixing belt is uniformized by the first rubbing member and the surface property recovery processing of the fixing belt of the second rubbing member is not performed during image formation. It is implemented at the job end. Therefore, foreign matters such as toner can be prevented from adhering to the first rubbing member and the second rubbing member.

  Further, in accordance with the fourth aspect of the invention, the fixing belt surface homogenization process by the first rubbing member and the surface property recovery process of the fixing belt surface of the second rubbing member are performed by execution instructions. Therefore, foreign matters such as toner can be prevented from adhering to the first rubbing member and the second rubbing member.

  Further, in accordance with claim 5, the surface roughness of the second rubbing member is made smaller than the surface roughness of the first rubbing member. Therefore, local plastic deformation of the fixing belt caused by burrs at both ends that occur when the first rubbing member and transfer paper (recording medium) are cut can be reliably removed. In addition, the second rubbing member can suppress the occurrence of side effects due to the first rubbing member (decrease in glossiness due to roughening of the fixing belt and degradation in separation performance).

  Corresponding to claim 6, the first rubbing member and the second rubbing member are composed of a cored bar and a polishing layer covering it. Therefore, the function of the first rubbing member (function to reliably remove the local plastic deformation of the fixing belt) and the function of the second rubbing member (suppression of degradation of glossiness and separation performance due to fixing belt roughness). Function).

  Further, since the abrasive layers of the first rubbing member and the second rubbing member are in a form in which abrasive grains are dispersed in a binder such as rubber or resin, corresponding to claim 7, therefore, the first rubbing member The function of the member and the function of the second rubbing member can be enhanced.

  Further, since the undulation of the polishing layer surface of the second rubbing member is made smaller than the undulation of the polishing layer surface of the first rubbing member corresponding to claim 8, the above functions of the first rubbing member and The above function of the second rubbing member can be enhanced.

  Further, since the number of abrasive grains of the second rubbing member is made larger than the number of abrasive grains in the polishing layer of the first rubbing member corresponding to claim 9, the first rubbing member of the first rubbing member The above function and the above function of the second rubbing member can be enhanced.

  The present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 rubbing part 1A drive control part (control means)
11 First rubbing member 12 Second rubbing member 13a Rotating shaft (switching means)
13 Rotating arm (switching means)
14 Core Bar 15 Polishing Layer 15a Binder 15b Abrasive Grain 2 Fixing Belt (Fixing Member)
3 Pressure roller (Pressure member; Opposing member)
4 Fixing roller 5 Heating roller 80 Fixing device N Nip part S Transfer paper (recording medium)
T Toner

JP 2011-175067 A JP 2006-259341 A

Claims (10)

A fixing device capable of transporting a recording medium carrying unfixed toner at a nip formed by a fixing member and an opposing member and fixing a toner image on the recording medium,
A first rubbing member having a function of rubbing the surface of the fixing member by rubbing the fixing member, and a second rubbing member for recovering the surface property of the fixing member roughened by the first rubbing member. With members,
A fixing device comprising: a rotary switching unit that switches between a state in which the first rubbing member is slidable on the fixing member and a state in which the second rubbing member is slidable on the fixing member. apparatus.   And a control unit for performing a recovery process for recovering the surface property of the fixing member by the second rubbing member after the surface rubbing of the surface of the fixing member by the first rubbing member is performed. The fixing device according to claim 1. The fixing device according to claim 2,
The control means performs a process for roughening the surface of the fixing member by the first rubbing member and a recovery process for recovering the surface property of the fixing member by the second rubbing member after the print job is completed. A fixing device characterized by the above. The fixing device according to claim 2,
The control means performs a process for roughening the surface of the fixing member by the first rubbing member and a recovery process for recovering the surface property of the fixing member by the second rubbing member based on an execution command. A fixing device characterized by the above.   5. The fixing device according to claim 1, wherein the surface roughness of the second rubbing member is smaller than the surface roughness of the first rubbing member. 6.   The fixing device according to claim 5, wherein the first rubbing member and the second rubbing member include a cored bar and a polishing layer covering the cored bar.   The fixing device according to claim 6, wherein the polishing layers of the first rubbing member and the second rubbing member are in a form in which abrasive grains are dispersed in a binder.   The fixing device according to claim 7, wherein the surface waviness of the polishing layer of the second rubbing member is smaller than the waviness of the surface of the polishing layer of the first rubbing member.   The fixing device according to claim 7, wherein the number of abrasive grains of the second rubbing member is higher than the number of abrasive grains in the polishing layer of the first rubbing member.   An image forming apparatus comprising the fixing device according to claim 1.

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