JP6135209B2 - Fixing device, image forming device, and maintenance method for fixing device - Google Patents

Fixing device, image forming device, and maintenance method for fixing device Download PDF

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JP6135209B2
JP6135209B2 JP2013050206A JP2013050206A JP6135209B2 JP 6135209 B2 JP6135209 B2 JP 6135209B2 JP 2013050206 A JP2013050206 A JP 2013050206A JP 2013050206 A JP2013050206 A JP 2013050206A JP 6135209 B2 JP6135209 B2 JP 6135209B2
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rubbing
fixing
unit
roller
recording medium
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JP2014174528A (en
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崇 酒巻
崇 酒巻
哲生 徳田
哲生 徳田
元義 山野
元義 山野
智志 上野
智志 上野
皓一 宇都宮
皓一 宇都宮
文洋 廣瀬
文洋 廣瀬
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株式会社リコー
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Description

  The present invention relates to a fixing device, an image forming apparatus, and a maintenance method for the fixing device. More specifically, the present invention relates to a fixing device mounted on an electrophotographic image forming apparatus such as a copying machine, a facsimile machine, a printer, or a complex machine thereof, and a maintenance method for the fixing device.

  Various image forming apparatuses using an electrophotographic system have been devised as image forming apparatuses such as copying machines, facsimiles, and printers, and are well-known techniques. In the image forming process, an electrostatic latent image is formed on the surface of the photosensitive drum as an image carrier, and the electrostatic latent image on the photosensitive drum is developed with a toner as a developer to be visualized and developed. The image is transferred to a recording medium (also referred to as paper, recording paper, or recording material) by a transfer device to carry the image, and the unfixed toner image on the recording medium is fixed by a fixing device using pressure, heat, or the like. It is established.

  Various types of fixing devices have been proposed. The fixing device includes a fixing roller maintained at a predetermined temperature, and a pressure roller as a pressure member in pressure contact with the fixing roller. The pressure roller and the fixing roller There is known a roller fixing method in which a recording medium carrying an unfixed toner image is heated while being nipped and conveyed by a nip portion (fixing nip portion) formed by pressure contact with the toner.

  A nip formed by a pressure contact between the pressure roller and the fixing belt is provided with a fixing roller disposed opposite the pressure roller and an endless fixing belt stretched between the fixing roller and the heating roller. There is known a belt fixing system in which heat of a heating roller is applied to a transfer material through a fixing belt to press and fix an unfixed toner image to a recording medium. These fixing systems are widely used from low speed machines to high speed machines, from monochrome machines to color machines.

  However, when a recording medium is passed through the fixing device, the surface of a fixing member such as a fixing roller or a fixing belt is damaged due to paper passing, paper dust, offset toner, and the like, and is gradually roughened. There is a problem. In particular, as a major cause of scratches, burrs at both ends (curvature of the ends) that occur during cutting of the recording medium are known.

  That is, when recording media of the same size are continuously passed through the fixing device, the positions where the burrs, which are both ends of the recording medium of the fixing member, pass through are easily roughened and damaged.

  Use in a state where the surface of the fixing member is dirty or rough in this way leads to uneven glossiness and deterioration of the image.

  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.

  For example, Patent Document 1 discloses a fixing member that heat-fixes a toner image on a recording material, a pressure member that forms a fixing nip portion that is in contact with the fixing member and holds a recording material that carries the toner image, and a fixing member. A surface recovery means having a rubbing member for rubbing the surface and performing a surface recovery process for recovering the surface property of the fixing member, and a control for controlling the surface recovery process corresponding to the contamination of the surface of the rubbing member A fixing device provided with a unit. According to Patent Document 1, it is possible to prevent the occurrence of uneven gloss.

  Japanese Patent Application Laid-Open No. 2003-228688 discloses a fixing device that includes a fixing member that fixes toner on a recording medium and a pressure member that forms a nip that contacts the fixing member and passes through the recording medium. There is disclosed a fixing device in which a cleaning body abuts and an auxiliary cleaning member abuts from the inside to the outside of a range corresponding to a predetermined sheet passing size on the surface of the fixing member. According to Patent Document 2, paper dust accumulated on the surface of the fixing member is removed by bringing the rotary cleaning body into contact with the surface of the fixing member, thereby preventing the occurrence of gloss streaks during image formation. be able to.

  However, the technique described in Patent Document 1 can recover the local plastic deformation of the surface of the fixing member, but the glossiness is reduced due to the rough surface of the fixing member caused by using the rubbing member. A decrease in separation performance could not be prevented. In the invention described in Patent Document 2, foreign matters such as paper dust deposited on the surface of the fixing member can be removed. However, the fixing member is locally localized due to burrs at both ends generated when the recording material is cut. The gloss streaks accompanying plastic deformation could not be removed.

  That is, if the surface of the fixing member is roughened to attempt to recover the local plastic deformation of the fixing member, as a side effect, a decrease in glossiness or a decrease in separation performance occurs due to the rough surface of the fixing member. There is a problem. Conventionally, there has been disclosed a technique for solving both the problem of recovering the local plastic deformation of the fixing member, and the problem of lowering the glossiness and lowering of separation performance due to the surface roughness of the fixing member as a side effect thereof. There wasn't.

  Accordingly, the present invention provides the surface properties of the first rubbing member having a function of leveling the surface of the fixing member by rubbing the fixing member and the fixing member subjected to a predetermined amount of recovery treatment by the first rubbing member. By having the second rubbing member to be recovered more removably, the first rubbing member can secure the effect of suppressing the local roughness of the surface of the fixing member, and the glossiness can be reduced or separated due to the roughening of the fixing member. It is an object of the present invention to provide a fixing device capable of suppressing the occurrence of performance degradation.

In order to achieve such an object, a fixing device according to the present invention is arranged so that a fixing member heated by a heating unit and at least a part of the fixing member can be pressed, and a nip portion is formed between the fixing member and the fixing member. A fixing member that transports a recording medium carrying an unfixed toner image to the nip portion and fixes the unfixed toner image on the recording medium, and rubs the fixing member. The first rubbing member for removing local plastic deformation of the fixing member, and the uniformity of the surface of the fixing member reduced by rubbing the first rubbing member by rubbing the fixing member. having at least 95% or more second rubbing member for recovering comprises a separation member for separating the recording medium conveyed from the nip portion from the fixing member detachably, the separating member, the first rubbing member and the front The second rubbing member, but is detachable in the same mounting portion.

  According to the present invention, it is possible to suppress the occurrence of a decrease in glossiness and a decrease in separation performance due to a rough fixing member.

1 is a cross-sectional view illustrating an embodiment of an image forming apparatus according to the present invention. 1 is a side cross-sectional view illustrating a configuration of an embodiment of a fixing device according to the present invention (first embodiment). It is sectional drawing which shows the structure of a rubbing member. It is a schematic diagram which shows the surface cross section of the grinding | polishing layer of a rubbing member, Comprising: (A) The 1st rubbing member and (B) The grinding | polishing layer surface of a 2nd rubbing member. It is a schematic block diagram at the time of seeing a rubbing member unit from a longitudinal direction. FIG. 3 is a schematic cross-sectional view in the axial direction of a fixing roller when a rubbing member unit is fixed to a fixing device. 3 is a flowchart illustrating an example of a fixing belt refresh process (first embodiment). FIG. 5 shows an example of a state in which a separation plate of a fixing device is mounted, and is a schematic sectional view in the axial direction of a fixing roller (second embodiment). FIG. 5 shows an example of a state in which a rubbing member unit of a fixing device is mounted, and is a schematic sectional view in an axial direction of a fixing roller (second embodiment). 10 is a flowchart illustrating an example of a fixing belt refresh process (second embodiment).

  Hereinafter, a configuration according to the present invention will be described in detail based on the embodiment shown in FIGS.

<First Embodiment>
(Image forming device)
FIG. 1 is a schematic configuration diagram illustrating the overall configuration of a tandem type color copier that is an embodiment of an image forming apparatus according to the present invention. The outline and operation of the internal configuration of the image forming apparatus will be described with reference to FIG.

  In FIG. 1, 1 is an image forming apparatus main body, 2 is a writing unit that emits laser light based on input image information, 3 is a document conveying unit that conveys a document D to a document reading unit 4, and 4 is image information of the document D. A document reading unit to be read, 7 is a paper feed unit for storing a recording medium P (not shown) such as transfer paper, 9 is a registration roller for adjusting the conveyance timing of the recording medium P, and 11Y, 11M, 11C, and 11BK are each color. Photosensitive drums on which toner images of (yellow, magenta, cyan, black) are formed, 12 is a charging unit that charges the respective photosensitive drums 11Y, 11M, 11C, and 11BK, and 13 is each photosensitive drum 11Y, 11M, A developing unit that develops the electrostatic latent images formed on 11C and 11BK, and 14 transfers the toner images formed on the photosensitive drums 11Y, 11M, 11C, and 11BK on the recording medium P in an overlapping manner. That a transfer bias roller (primary transfer bias roller), 15 denotes the photosensitive drums 11Y, 11M, 11C, a cleaning unit for collecting the untransferred toner on 11BK.

  Reference numeral 16 denotes an intermediate transfer belt cleaning unit that cleans the intermediate transfer belt 17, 17 an intermediate transfer belt on which toner images of a plurality of colors are transferred and superimposed, and 18 a color toner image on the intermediate transfer belt 17 on the recording medium P. A secondary transfer bias roller 20 for transferring the toner image onto the recording medium P indicates a fixing device for fixing the toner image on the recording medium P.

  Hereinafter, an operation during normal color image formation in the image forming apparatus will be described. First, the document D is transported from the document table in the direction of the arrow in the drawing by the transport rollers of the document transport unit 3 and placed on the contact glass 5 of the document reading unit 4. Then, the document reading unit 4 optically reads the image information of the document D placed on the contact glass 5. Specifically, the document reading unit 4 scans the image of the document D on the contact glass 5 while irradiating light emitted from an illumination lamp. Then, the light reflected by the document D is imaged on the color sensor via the mirror group and the lens. The color image information of the document D is read for each RGB (red, green, blue) color separation light by the color sensor, and then converted into an electrical image signal. Further, color conversion processing, color correction processing, spatial frequency correction processing, and the like are performed by the image processing unit based on the RGB color separation image signals to obtain yellow, magenta, cyan, and black color image information.

  Then, the image information of each color of yellow, magenta, cyan, and black is transmitted to the writing unit 2. The writing unit 2 emits laser light (exposure light) based on the image information of each color toward the corresponding photosensitive drums 11Y, 11M, 11C, and 11BK.

  On the other hand, the four photosensitive drums 11Y, 11M, 11C, and 11BK are rotated clockwise in FIG. First, the surfaces of the photosensitive drums 11Y, 11M, 11C, and 11BK are uniformly charged at a portion facing the charging unit 12 (charging process). Thus, a charged potential is formed on the photosensitive drums 11Y, 11M, 11C, and 11BK. Thereafter, the charged surfaces of the photosensitive drums 11Y, 11M, 11C, and 11BK reach the irradiation positions of the respective laser beams.

  In the writing unit 2, laser light corresponding to the image signal is emitted from the four light sources corresponding to each color. Each laser beam passes through a different optical path for each color component of yellow, magenta, cyan, and black (exposure process).

  Laser light corresponding to the yellow component is irradiated on the surface of the first photosensitive drum 11Y from the left side of the drawing. At this time, the yellow component laser light is scanned in the rotation axis direction (main scanning direction) of the photosensitive drum 11Y by a polygon mirror that rotates at high speed. Thus, an electrostatic latent image corresponding to the yellow component is formed on the photosensitive drum 11Y charged by the charging unit 12.

  Similarly, the laser beam corresponding to the magenta component is irradiated onto the surface of the second photosensitive drum 11M from the left side of the paper, and an electrostatic latent image corresponding to the magenta component is formed. The cyan component laser light is applied to the surface of the third photosensitive drum 11C from the left side of the paper, and an electrostatic latent image of the cyan component is formed. The black component laser beam is applied to the surface of the fourth photosensitive drum 11BK from the left side of the paper, and an electrostatic latent image of the black component is formed.

  Thereafter, the surfaces of the photosensitive drums 11Y, 11M, 11C, and 11BK on which the electrostatic latent images of the respective colors are formed reach the positions facing the developing unit 13, respectively. Then, the respective color toners are supplied from the developing units 13 onto the photosensitive drums 11Y, 11M, 11C, and 11BK, and the latent images on the photosensitive drums 11Y, 11M, 11C, and 11BK are developed (developing step).

  Thereafter, the surfaces of the photoconductive drums 11Y, 11M, 11C, and 11BK after the development process reach the opposed portions to the intermediate transfer belt 17, respectively. Here, a transfer bias roller 14 is installed at each facing portion so as to contact the inner peripheral surface of the intermediate transfer belt 17. Then, the toner images of the respective colors formed on the photosensitive drums 11Y, 11M, 11C, and 11BK are sequentially superimposed and transferred onto the intermediate transfer belt 17 at the position of the transfer bias roller 14 (primary transfer process). .

  Then, the surfaces of the photosensitive drums 11Y, 11M, 11C, and 11BK after the transfer process reach positions facing the cleaning unit 15, respectively. Then, the untransferred toner remaining on the photosensitive drums 11Y, 11M, 11C, and 11BK is collected by the cleaning unit 15 (cleaning process).

  Thereafter, the surfaces of the photoconductive drums 11Y, 11M, 11C, and 11BK pass through a static elimination unit (not shown), and a series of image forming processes on the photoconductive drums 11Y, 11M, 11C, and 11BK is completed.

  On the other hand, the intermediate transfer belt 17 on which the toners of the respective colors on the photoconductive drums 11Y, 11M, 11C, and 11BK are transferred (carried) are run in the clockwise direction in the drawing and are connected to the secondary transfer bias roller 18. Reach the opposite position. The color toner image carried on the intermediate transfer belt 17 is transferred onto the recording medium P at a position facing the secondary transfer bias roller 18 (secondary transfer step).

  Thereafter, the surface of the intermediate transfer belt 17 reaches the position of the intermediate transfer belt cleaning unit 16. Then, the untransferred toner adhered on the intermediate transfer belt 17 is collected by the intermediate transfer belt cleaning unit 16, and a series of transfer processes in the intermediate transfer belt 17 is completed.

  Here, the recording medium P conveyed between the intermediate transfer belt 17 and the secondary transfer bias roller 18 (secondary transfer nip) is conveyed from the paper supply unit 7 via the registration roller 9 and the like. is there.

  Specifically, the recording medium P fed by the paper feeding roller 8 from the paper feeding unit 7 that stores the recording medium P is guided to the registration roller 9 after passing through the conveyance guide. The recording medium P that has reached the registration roller 9 is conveyed toward the secondary transfer nip at the same timing.

  Then, the recording medium P on which the full-color image is transferred is guided to the fixing device 20 by the transport belt. In the fixing device 20, a color image (toner) is fixed on the recording medium P at a nip between a fixing roller 22 as a fixing member and a pressure roller 23 as a pressure member.

  Then, the recording medium P after the fixing step is discharged as an output image outside the apparatus main body 1 by a paper discharge roller, and a series of image forming processes is completed.

(Fixing device)
[Configuration of Fixing Device]
Next, the configuration and control of the fixing device 20 included in the image forming apparatus 1 will be described. The fixing device according to the present embodiment is arranged so that at least a part of the fixing member (fixing belt 24) heated by the heating unit (heater 25) can be pressed, and a nip portion between the fixing member. A recording medium (recording medium P) carrying an unfixed toner image (unfixed toner image T) in the nip portion, and the unfixed toner. In a fixing device (fixing device 20) for fixing an image on a recording medium, a first rubbing member (first rubbing member 31) that removes or reduces local plastic deformation of the fixing member by rubbing the fixing member. ), And a second rubbing member (second rubbing member 32) that recovers the uniformity of the surface of the fixing member that has been lowered by rubbing the first rubbing member by rubbing the fixing member. In addition, the first rubbing member and the second rubbing member Member, the same mounting portion (rubbing member mounting member 47, FIG. 6) are those wherein detachable to. In addition, the code | symbol in embodiment and the example of application are shown in a parenthesis.

  FIG. 2 shows an example of the fixing device 20, and is a schematic sectional view in the axial direction of the fixing roller 22.

  The fixing device 20 forms a nip portion between the heating roller 21, the fixing roller 22, the fixing belt 24 stretched between the heating roller 21 and the fixing roller 22, and the fixing roller 22 by pressing the fixing roller 22. And a pressure roller 23. The heating roller 21 has a heater 25 as a heat source, and the pressure roller 23 has a heater 26 as a heat source. Further, the tension roller 27 has a role of applying a certain tension to the fixing belt 24 stretched around two roller members.

  A rubbing member 30 that is pressed against the fixing belt 24 with a predetermined pressure on the outer peripheral surface of the fixing belt 24 and rotates with a predetermined linear velocity difference in the forward direction or the reverse direction with respect to the rotation direction of the fixing belt 24 is provided. ing.

  The fixing device 20 passes a recording medium P (paper) carrying an unfixed toner image T in the nip portion between the fixing belt 24 and the pressure roller 23 formed by pressure contact between the fixing roller 22 and the pressure roller 23. Then, heat fixing is performed. The heating roller 21, the fixing roller 22, and the pressure roller 23 are pivotally supported so as to be rotatable in the longitudinal direction of a housing (not shown) of the fixing device 20, and the driving means of each roller (not shown) are fixed to the housing. Is retained.

  The recording medium P that has passed through the nip portion is separated at its leading end by a separation plate 28 disposed on the fixing roller 22 side or a separation plate 29 disposed on the pressure roller 23 side, and is discharged to the next process. The separation plates 28 and 29 as separation members disposed on the fixing roller 22 side and the pressure roller 23 side are not limited to plate-like members, and separation claws may be used.

  The heating roller 21 is a thin cylindrical body made of, for example, a metal material, and a heater 25 as a heat source is fixed inside the cylindrical body. As the heater 25, for example, a halogen heater or a carbon heater can be used. Further, both end portions of the heater 25 are fixed to the casing of the fixing device 20. The heater 25 may be an induction heating unit that heats the heating roller 21 from the outside.

  The output of the heater 25 is controlled by a power supply unit (AC power supply) of the apparatus main body, and the heating roller 21 is heated by the radiant heat from the heater 25. Further, heat is applied to the unfixed toner image T on the recording medium P from the surface of the fixing belt 24 heated by the heating roller 21. The output control of the heater 25 is performed based on the detection result of the belt surface temperature by a temperature sensor (not shown) such as a thermopile provided at a position facing the surface of the fixing belt 24.

  The fixing belt 24 is wound around the fixing roller 22 and the heating roller 21, and is in close contact with the heating roller 21 and the fixing roller 22. The fixing nip portion is configured by pressing the pressure roller 23 against the fixing belt 24 configured as described above at a position corresponding to the fixing roller 22.

  The fixing belt 24 is, for example, 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 layer thickness of 90 μm.

  The elastic layer of the fixing belt 24 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 24 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. ing. By providing the release layer on the surface layer of the fixing belt 24, the releasability (peelability) for the toner (toner image) is ensured.

  Further, the fixing belt 24 is composed of, for example, a PI belt which is an endless film of a heat-resistant resin having a thickness of 90 μm, and the surface layer has an anti-offset agent such as PFA (tetrafluoroethylene barfluoroalkyl vinyl ether copolymer resin). Is coated.

  The fixing roller 22 does not have a heat source, and is formed by covering a highly rigid core material (core metal 22b) such as metal (iron or aluminum) with a thick elastic layer 22a such as silicone rubber.

  Similar to the fixing roller 22, the pressure roller 23 is a roller member in which an elastic layer such as fluorine rubber, silicone rubber, and foamable silicone rubber is formed on a core metal such as SUS304. A heater 26 as a heat source is fixed inside the cylindrical body. In addition, it is good also as a structure which does not have the heater 26. FIG.

  The fixing roller 22 and the pressure roller 23 are rubber rollers arranged to face each other. When the pressure roller 23 is pressed toward the center of the fixing roller 22 via the fixing belt 24, the pressure roller 23. And a fixing belt 24 form a nip portion.

  Further, the driving unit drives the fixing roller 22 to rotate in the clockwise direction. As the fixing roller 22 rotates, the pressure roller 23 and the fixing belt 24 that are in pressure contact with the fixing roller 22 rotate at the same speed.

[Rubbing member]
Further, the rubbing member 30 is either the first rubbing member 31 or the second rubbing member 32 (hereinafter referred to as the rubbing member 30 if not distinguished), and during operation of the fixing device 20. The belt is pressed against the fixing belt 24 with a predetermined pressure, and rotates with a predetermined linear velocity difference in the forward direction or the reverse direction with respect to the rotation direction of the fixing belt 24.

  Here, the first rubbing member 31 roughens the fixing belt 24 substantially uniformly due to local plastic deformation of the fixing belt 24 caused by burrs or the like at both ends generated when the recording medium P is cut (flatness). Is eliminated or reduced). Further, the second rubbing member 32 suppresses the occurrence of a decrease in glossiness and a decrease in separation performance due to the roughening of the fixing belt 24 that occurs when the fixing belt 24 is rubbed with the first rubbing member 31. It is.

  Here, the fixing device 20 including both the first rubbing member 31 and the second rubbing member 32 may be used, and a configuration in which these are appropriately switched may be considered. However, when the two rubbing members 31 and 32 are arranged in the fixing device 20 as described above, the size of the fixing device 20 increases, and it is difficult to reduce the size of the fixing device and the image forming apparatus including the fixing device. In addition, since a mechanism for switching the rubbing state between the first rubbing member 31 and the second rubbing member 32 is required, the configuration of the apparatus becomes complicated and the cost increases.

  Therefore, the fixing device 20 according to the present embodiment is configured such that the first rubbing member 31 and the second rubbing member 32 can be attached to and detached from the same attachment location (attachment portion).

  FIG. 3 is a cross-sectional view showing the configuration of the rubbing member 30. The rubbing member 30 is configured by forming a polishing layer 34 on the outer periphery of a cored bar 33.

  Here, the metal core 33 is a support for the entire rubbing member 30 and is made of a metal material such as iron or aluminum in order to ensure rigidity. Further, the cored bar 33 may be made of a nonmagnetic or insulating material such as nonmagnetic stainless steel or ceramic.

  The polishing layer 34 is formed by dispersing abrasive grains 36 in a binder (binder layer) 35 such as rubber or resin. Here, as a material of the binder 35, silicone rubber, fluororesin, or the like can be used. Moreover, as a material of the abrasive grain 36, white alumina, brown alumina, pulverized alumina, light red alumina, green silicon carbide, black silicon carbide, diamond, CBN (cubic boron nitride), or the like can be used.

  The rubbing member 30 configured in this way is connected to a driving means (motor) (not shown). When the driving means is driven to rotate and the core metal 33 is rotated, the polishing layer 34 and the fixing belt 24 are brought together. Rubbed.

  When the fixing belt 24 is rubbed by the abrasive grains 36 protruding from the binder 35 in the polishing layer 34, the first rubbing member 31 causes the local deformation of the fixing belt 24 to be substantially uniform in the fixing belt 24. The second rubbing member 32 suppresses the occurrence of lowering of glossiness and lowering of separation performance due to the roughening of the fixing belt 24 caused by rubbing of the first rubbing member 31.

  4A and 4B are schematic views showing a surface cross section of the polishing layer 34 of the rubbing member 30. FIG. 4A shows the polishing of the first rubbing member 31, and FIG. The layer surface is shown.

  As shown in FIG. 4, the surface of the polishing layer 34 of the rubbing member 30 is warped on the surface of the first rubbing member 31 more than the surface of the second rubbing member 32 (refers to a wave-shaped wave height A). Is formed to be large.

  Here, even if the abrasive grains 36 dispersed in the binder 35 of the abrasive layer 34 have the same count (granularity), the surface of the fixing belt 24 is rougher and well scraped when the surface of the abrasive layer 34 is more wavy. It can be said that the smaller the undulation of the surface of the polishing layer 34, the finer the surface of the fixing belt 24 and the smoother the surface property.

  Therefore, as shown in FIG. 4, the first rubbing member 31 is increased by increasing the waviness on the surface of the polishing layer 34 of the first rubbing member 31 and decreasing the waviness on the surface of the polishing layer 34 of the second rubbing member 32. Then, the function of removing the local plastic deformation of the fixing belt 24 by roughly uniformly roughing the fixing belt 24 is enhanced. In the second rubbing member 32, the fixing belt 24 generated by rubbing of the first rubbing member 31 is improved. It is possible to enhance the function of suppressing the decrease in glossiness and the decrease in separation performance due to the roughness of the surface.

  Further, the smaller the count of the abrasive grains 36 dispersed in the binder 35 of the polishing layer 34 is, the rougher the surface of the fixing belt 24 is, and the more excellent the count of the abrasive grains 36 is. It can be said that the surface of the film is fine and the surface properties can be cut smoothly.

  Therefore, in addition to or instead of changing the waviness of the surface of the polishing layer 34 of the rubbing member 30 as described above, the abrasive dispersed in the binder 35 in the polishing layer 34 of the rubbing member 30 is used. The first rubbing member 31 fixes the local plastic deformation of the fixing belt 24 by increasing the number of the particles 36 relative to that of the first rubbing member 31 relative to that of the first rubbing member 31. The function of removing the belt 24 by roughening the belt 24 substantially uniformly is improved. In the second rubbing member 32, the glossiness and separation performance are lowered due to the roughening of the fixing belt 24 caused by the rubbing of the first rubbing member 31. The function of suppressing the occurrence can be enhanced.

  For example, the count (granularity) of the abrasive grains 36 of the first rubbing member 31 can be # 1500 (P1500), and the count of the abrasive grains 36 of the second rubbing member 32 can be # 2000 (P2000). Note that the above-mentioned count is just an example, and any value may be selected as long as the optimum value is selected according to the fixing belt 24, the process conditions for rubbing, and other conditions.

  Further, the first rubbing member 31 and the second rubbing member 32 are made of a metal material instead of the rubbing member 30 having the polishing layer 34 formed on the outer periphery of the metal core 33 as described above. The surface may be roughened. In this case, the metal surface of the first rubbing member 31 and the second rubbing member 32 is roughened by making the first rubbing member 31 rougher than the second rubbing member 32. The first rubbing member 31 may have a higher surface roughness (such as arithmetic average roughness Ra) than the member 32.

[Rubbing member unit]
Next, the rubbing member unit 40 that supports the rubbing member 30 and the attachment of the rubbing member unit 40 to the attachment portion of the fixing device 20 will be described. Hereinafter, the rubbing member unit 40 for supporting the first rubbing member 31 is referred to as the first rubbing member unit 41, and the rubbing member unit 40 for supporting the second rubbing member 32 is referred to as the second rubbing. It is also referred to as a member unit 42 and is referred to as a rubbing member unit 40 when not distinguished.

  FIG. 5 is a schematic configuration diagram when the rubbing member unit 40 is viewed from the axial direction of the rubbing member 30 which is the longitudinal direction. FIG. 6 is a schematic cross-sectional view in the axial direction of the fixing roller 22 when the rubbing member unit 40 is fixed to the fixing device 20.

  In the present embodiment, the rubbing member 30 includes a cored bar 33 and a polishing layer 34. The rubbing member unit 40 is sandwiched by embossing or the like between the rubbing member 30, a bearing 43 that supports the rubbing member 30 by pivotally supporting the metal core 33 of the rubbing member 30, and the bearing 43 and the stay 45. A spring 44 that connects the bearing 43 and the stay 45 and supports the bearing 43 via the spring 44, and is fixed to the rubbing member mounting member 47 that is an attachment portion of the fixing device 20 with a screw 46. And a stay 45 that can be installed.

  By using such a rubbing member unit 40, the strength of the rubbing member 30 can be secured and a predetermined pressure by the rubbing member 30 can be uniformly applied to the fixing belt 24.

  Here, the rubbing member mounting member 47 is provided, for example, at two locations on the axial end side of the fixing roller 22 of the housing of the fixing device 20, and is provided on the rubbing member mounting member 47 and the stay 45. By tightening the screw 46 with the screw holes aligned, the rubbing member unit 40 can be mounted on the fixing device 20.

  In the present embodiment, the rubbing member unit 40 is attached to the attachment portion of the fixing device 20 by fastening a fastening member (for example, a screw), but is not limited thereto. The rubbing member unit 40 and the mounting portion of the fixing device 20 may have a shape that fits into each other, and the like may be fitted.

  Here, as the rubbing member unit 40, a rubbing member unit 41 having the first rubbing member 31 and a rubbing member unit 42 having the second rubbing member 32 are prepared, and the rubbing member is mounted. The fixing device 20 including the rubbing member 30 that exhibits the above-described functions is configured by mounting either the first rubbing member unit 41 or the rubbing member unit 42 on the member 47 as necessary. be able to.

  At this time, since the rubbing member mounting member 47 and the stay 45 are screwed, the work for exchanging the rubbing member unit 40 is facilitated and the exchangeability of the rubbing member unit 40 is improved. Can do.

  Members other than the rubbing member 30 of the rubbing member unit 40 are fixed to the fixing device 20, and only the rubbing member 30 is exchanged between the first rubbing member 31 and the second rubbing member 32. It is good also as a possible structure.

  In this way, by fixing the first rubbing member unit 41 or the second rubbing member unit 42 to the fixing device 20, the polishing layer 34 of the first rubbing member 31 and the second rubbing member 32 having different functions. It is possible to apply a stable pressure between the first rubbing member 31 and the second rubbing member 32 in a stable manner.

  The material of the stay 45 of the rubbing member unit 40 is preferably a mold material such as ABS or polycarbonate ABS (PC / ABS alloy). As a result, the stay 45 of the rubbing member unit 40 is difficult to store heat due to the heat generated by the fixing device 20, and can be made difficult to reach a high temperature. The exchangeability of the rubbing member unit 40 can be improved.

  Moreover, it is preferable that the material of the stay 45 of the rubbing member unit 40 is subjected to a flocking process such as electrodeposition flocking (electrostatic flocking process). As a result, even if the material of the stay 45 is storing heat, an air layer is interposed by flocking. Therefore, even if a user such as a user or a serviceman touches the stay 45 at the time of replacement, it is difficult to feel the heat. For this reason, the exchangeability of the rubbing member unit 40 can be improved.

  The stay 45 in the rubbing member unit 40 may be made of a metal material such as SUS (stainless steel). In the case of this configuration, it is possible to increase the strength of the first rubbing member 31 and the second rubbing member 32, and to achieve a longer life than the case where the material of the stay 45 is an ABS resin material (the compensation life is reduced). (About 30 times). Further, the material of the stay 45 of the rubbing member unit 40 is made of PET (polyethylene terephthalate), which has excellent heat resistance, so that it is difficult to store heat and the exchangeability of the rubbing member unit 40 can be improved. The life of the stay 45 can be extended.

[Maintenance of fixing member]
The maintenance process (also referred to as maintenance process or refresh process) of the fixing belt 24 by the first rubbing member 31 and the second rubbing member 32 of the fixing device 20 described above will be described.

  FIG. 7 is a flowchart showing an example of the refresh process of the fixing belt 24 (the fixing device maintenance method according to the present invention).

  First, a user such as a user or a serviceman fixes the first rubbing member unit 41 having the first rubbing member 31 to the mounting portion (rubbing member mounting member 47) of the fixing device 20 (S101). As a result, the first rubbing member 31 comes into contact with the fixing belt 24 with a predetermined pressure (S102).

  Next, the first rubbing member 31 is rotated by the driving means with a linear velocity difference in the forward direction or the reverse direction with respect to the rotation direction of the fixing belt 24 (S103). The first rubbing member 31 removes or reduces local plastic deformation of the fixing belt 24 caused by burrs or the like at both ends that occur when the recording medium P is cut, by roughening the fixing belt 24 substantially uniformly. .

  Next, the user removes the first rubbing member unit 41 from the mounting portion, and attaches the second rubbing member unit 42 having the second rubbing member 32 to the same mounting portion, whereby the first rubbing member Exchange from 31 to the second rubbing member 32 is performed (S104). As a result, the second rubbing member 32 comes into contact with the fixing belt 24 with a predetermined pressure (S105).

  Next, the second rubbing member 32 is rotated by the driving means with a linear velocity difference in the forward direction or the reverse direction with respect to the rotation direction of the fixing belt 24 (S106). The second rubbing member 32 suppresses the occurrence of a decrease in glossiness and a decrease in separation performance due to the roughness of the fixing belt 24 caused by the use of the first rubbing member 31.

  Finally, the user removes the second rubbing member unit 42 from the attachment portion, and the refreshing operation of the fixing belt 24 is completed. In a state where the rubbing member unit 40 is not attached, the attachment portion is in a position that does not have any influence during the normal operation of the fixing device 20, as shown in FIG.

  As described above, according to the fixing device according to this embodiment, the fixing member roughened by a predetermined amount by the first rubbing member having the function of roughly uniforming the surface property of the fixing member and the first rubbing member. By detachably attaching the second rubbing member that restores the surface property of the member, it is possible to prevent the local roughness of the fixing member and to reduce the glossiness and the separation performance due to the roughness of the fixing member. Can be suppressed.

  In addition, the first rubbing member and the second rubbing member can be attached to the same attachment location in the fixing device so that the two rubbing members are not included in the fixing device, and the size of the fixing device can be reduced. Cost can be reduced.

  In addition, since the replacement of the rubbing member unit including the rubbing member is simplified, a user such as a user or a serviceman can easily and safely replace the rubbing member unit to fix the fixing member. It is possible to carry out maintenance.

  In the above embodiment, the belt fixing type fixing device has been described as an example, but other methods, for example, a roller fixing method in which a nip portion is formed by pressure contact between a pressure roller and a heating roller (fixing roller), Of course, the present invention may be applied to a fixing device of a film fixing type using a film member stretched between a fixing roller and a heating roller in place of the fixing belt as a belt member.

  Further, the driving means for the rubbing member 30 may be the same driving means for the first rubbing member 31 and the second rubbing member 32, or may be different driving means. In the case of the same driving means, the first rubbing member unit 41 and the second rubbing member unit 42 are common units other than the first rubbing member 31 and the second rubbing member 32, and the first rubbing member 31. And the second rubbing member 32 can be exchanged so that the driving means can be shared. Further, when different driving means (first rubbing member unit / second rubbing member unit) are used, the respective rubbing members 30 may be set to appropriate pressures.

  Further, it is preferable that the driving means of the rubbing member 30 can switch the rotation speed between the first rubbing member 31 and the second rubbing member 32. Of course, a plurality of speeds may be switched (speed control). The control unit for controlling the driving means is provided in the common rubbing member unit, and the type of the first rubbing member 31 and the second rubbing member 32 is detected by a sensor or the like, so that the first rubbing member unit is detected. It is also preferable to detect whether the rubbing member 31 and the second rubbing member 32 are set in an appropriate rubbing member order. In this configuration, when inappropriate, it is possible to provide a configuration that improves the convenience of the user by notifying the outside of the apparatus or not driving.

<Second Embodiment>
Hereinafter, other embodiments of the fixing device according to the present invention will be described. In addition, the description about the same point as the said embodiment is abbreviate | omitted.

  In the first embodiment, the first rubbing member 31 (first rubbing member unit 41) and the second rubbing member 32 (second rubbing member unit 42) can be attached to and detached from the fixing device 20. An example has been described in which replacement is possible as necessary. In the first embodiment, since the installation positions of the first rubbing member 31 and the second rubbing member 32 are provided, it is necessary to provide a space for the fixing device 20. This leads to an increase in the size of the device 20.

  Therefore, the fixing device 20 according to the second embodiment is detachably provided with a separating member that separates the recording medium P conveyed from the nip portion from the fixing belt 24, and includes the separating member, the first rubbing member 31, and the second rubbing member. All the rubbing members 32 can be attached to and detached from the same mounting portion. That is, the separation member (for example, the separation plate 28) that is originally provided on the fixing roller 22 side and can be attached and detached can be attached and detached, and the attachment portion of the separation member and the above-described rubbing member 30 (the rubbing member). The attachment portion of the member unit 40) is the same attachment portion.

  As a result, it is not necessary to provide a separate installation space for the rubbing member 30 in the fixing device 20, so that the size of the fixing device 20 is not increased. It should be noted that the separation plate 28 itself is not used during maintenance of the fixing member, so that no particular problem occurs even if the separation plate 28 is temporarily separated from the fixing device 20.

  FIG. 8 shows an example of a state in which the separation plate 28 of the fixing device 20 according to the present embodiment is mounted, and is a schematic sectional view in the axial direction of the fixing roller 22.

  The fixing device 20 includes a heating roller 21, a fixing roller 22, a fixing belt 24, a pressure roller 23, and a tension roller 27. The heating roller 21 has a heater 25 and the pressure roller 23 has a heater 26 therein.

  The fixing device 20 passes a recording medium P (paper) carrying an unfixed toner image T in the nip portion between the fixing belt 24 and the pressure roller 23 formed by pressure contact between the fixing roller 22 and the pressure roller 23. Then, heat fixing is performed.

  The recording medium P that has passed through the nip portion is separated at its leading end by a separation plate 28 disposed on the fixing roller 22 side or a separation plate 29 disposed on the pressure roller 23 side, and is discharged to the next process. The separation plates 28 and 29 as separation members disposed on the fixing roller 22 side and the pressure roller 23 side are not limited to plate-like members, and separation claws may be used.

  The separation plate 28 of the fixing device 20 is fastened and attached to a separation member mounting member 48 provided on the housing of the fixing device 20 by a fastening member such as a screw. The separation plate 28 is separated from the separation member mounting member 48. Detachable.

  The separation member mounting member 48 is provided, for example, at two locations on the axial end side of the fixing roller 22 of the casing of the fixing device 20, and screw holes provided in the separation member mounting member 48 and the separation plate 28 are provided. By tightening the screws in the combined state, the separating plate 28 can be attached to the fixing device 20.

  FIG. 9 shows an example of a state in which the rubbing member unit 40 of the fixing device 20 according to this embodiment is mounted, and is a schematic sectional view in the axial direction of the fixing roller 22.

  In the fixing device 20 according to this embodiment, the separation member mounting member 48 is configured as the same member as the rubbing member mounting member 47 described in the first embodiment. That is, the separation member mounting member 48 from which the separation plate 28 has been detached also functions as the rubbing member mounting member 47, and as described above, the separation member mounting member 48 (the rubbing member mounting member 47) includes the first member. The rubbing member 31 (first rubbing member unit 41) and the second rubbing member 32 (second rubbing member unit 42) can be mounted.

  A maintenance process (also referred to as maintenance process or refresh process) of the fixing belt 24 by the first rubbing member 31 and the second rubbing member 32 of the fixing device 20 according to the present embodiment will be described. FIG. 10 is a flowchart illustrating another example of the refreshing process of the fixing belt 24 (the fixing device maintenance method according to the present invention).

  First, a user such as a user or a serviceman removes the separation plate 28 from the attachment portion (separation member mounting member 48) of the fixing device 20 (S201).

  Next, the user fixes the first rubbing member unit 41 having the first rubbing member 31 to the mounting portion (the separation member mounting member 48, that is, the rubbing member mounting member 47) of the fixing device 20. (S202). As a result, the first rubbing member 31 comes into contact with the fixing belt 24 with a predetermined pressure (S203).

  Next, the first rubbing member 31 is rotated by the driving means with a linear speed difference in the forward direction or the reverse direction with respect to the rotation direction of the fixing belt 24 (S204). The first rubbing member 31 removes local plastic deformation of the fixing belt 24 caused by burrs or the like at both ends generated when the recording medium P is cut, by roughening the fixing belt 24 substantially uniformly.

  Next, the user removes the first rubbing member unit 41 from the mounting portion, and attaches the second rubbing member unit 42 having the second rubbing member 32 to the same mounting portion, whereby the first rubbing member Exchange from 31 to the second rubbing member 32 is performed (S205). As a result, the second rubbing member 32 comes into contact with the fixing belt 24 with a predetermined pressure (S206).

  Next, the second rubbing member 32 is rotated by the driving means with a linear speed difference in the forward direction or the reverse direction with respect to the rotation direction of the fixing belt 24 (S207). The second rubbing member 32 suppresses the occurrence of a decrease in glossiness and a decrease in separation performance due to the roughness of the fixing belt 24 caused by the use of the first rubbing member 31.

  Finally, the user removes the second rubbing member unit 42 from the attachment portion (S208), reinstalls the separation plate 28 in the attachment portion (S209), and the refresh operation of the fixing belt 24 is completed.

  As described above, according to the fixing device according to the second embodiment, the first rubbing member and the second rubbing member are further provided at the attachment position of the separation member on the fixing member side originally provided in the fixing device. By adopting a configuration that replaces the rubbing member, it is not necessary to provide a space for installing the first rubbing member and the second rubbing member in the fixing device, and it is possible to prevent the increase in the size of the fixing device. The effects of the first rubbing member and the second rubbing member can be exhibited.

  The above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Writing part 3 Original conveyance part 4 Original reading part 5 Contact glass 7 Paper feed part 8 Paper feed roller 9 Registration roller 11Y, 11M, 11C, 11BK Photosensitive drum 12 Charging part 13 Developing part 14 Transfer bias roller ( Primary transfer bias roller)
DESCRIPTION OF SYMBOLS 15 Cleaning part 16 Intermediate transfer belt cleaning part 17 Intermediate transfer belt 18 Secondary transfer bias roller 20 Fixing device 21 Heating roller 22 Fixing roller 23 Pressure roller 24 Fixing belt 25 Heater (heating roller)
26 Heater (Pressure roller)
27 Tension roller 28 Separating plate (fixing roller side)
29 Separation plate (pressure roller side)
30 rubbing member 31 first rubbing member 32 second rubbing member 33 core metal 34 polishing layer 35 binder 36 abrasive grain 40 rubbing member unit 41 first rubbing member unit 42 second rubbing member unit 43 bearing 44 spring 45 Stay 46 Screw 47 Sliding member mounting member 48 Separating member mounting member P Recording medium T Unfixed toner image

JP 2011-175067 A JP 2006-259341 A

Claims (9)

  1. A fixing member heated by a heating means;
    A pressure member that is arranged to be able to press at least a part of the fixing member and that forms a nip portion with the fixing member,
    In a fixing device that conveys a recording medium carrying an unfixed toner image to the nip portion and fixes the unfixed toner image on the recording medium.
    The first rubbing member that removes local plastic deformation of the fixing member by rubbing the fixing member, and the first rubbing member lowered by rubbing the first rubbing member by rubbing the fixing member. While having any of the second rubbing member to restore the uniformity of the surface of the fixing member,
    A separation member for separating the recording medium conveyed from the nip portion from the fixing member is detachably provided,
    The fixing device , wherein the separation member, the first rubbing member, and the second rubbing member can be attached to and detached from the same mounting portion.
  2. The first rubbing member or the second rubbing member is
    The first rubbing member or the second rubbing member;
    A bearing for supporting the first rubbing member or the second rubbing member;
    A stay provided in the axial direction of the first rubbing member or the second rubbing member;
    The fixing device according to claim 1, wherein the fixing device is detachable from the mounting portion as a rubbing member unit having an elastic member that connects the bearing and the stay.
  3. The fixing device according to claim 2 , wherein the stay of the rubbing member unit is fastened to the mounting portion by a fastening member, so that the rubbing member unit is attached to the fixing device. .
  4. The fixing device according to claim 2 or 3, characterized in that flocking to the stay of the surface of the rubbing member unit is applied.
  5. The stay of the rubbing member unit includes a fixing device according to claim 2, characterized in that it consists of a metal material or a molding material to 4.
  6. The first rubbing member and the second rubbing member are composed of a cored bar and a polishing layer covering the cored bar,
    The polishing layer, fixing device according to claim 1, wherein the abrasive grains are dispersed in a binder layer to 5.
  7. The waviness of the polishing layer surface of the second rubbing member is smaller than the waviness of the polishing layer surface of the first rubbing member, and / or the grain size of the abrasive grains in the polishing layer of the first rubbing member. The fixing device according to claim 6 , wherein the second rubbing member has a higher abrasive grain size.
  8. An image forming apparatus comprising: a fixing device according to any one of claims 1 to 7.
  9. A fixing member heated by a heating means;
    A pressure member that is arranged to be able to press at least a part of the fixing member and that forms a nip portion with the fixing member,
    Conveying a recording medium carrying an unfixed toner image at the nip, fixing the unfixed toner image on the recording medium; and
    The first rubbing member that removes local plastic deformation of the fixing member by rubbing the fixing member, and the first rubbing member lowered by rubbing the first rubbing member by rubbing the fixing member. While having any of the second rubbing member to restore the uniformity of the surface of the fixing member,
    A separation member for separating the recording medium conveyed from the nip portion from the fixing member is detachably provided,
    Regarding the fixing device in which the separation member, the first rubbing member, and the second rubbing member are detachable from the same mounting portion,
    After the separation member is removed from the mounting portion, the first rubbing member is attached to the mounting portion, and the first rubbing member and the fixing member are driven to rotate with a linear velocity difference. Process,
    A second step of attaching the second rubbing member to the mounting portion and rotating the second rubbing member and the fixing member with a linear velocity difference;
    Maintenance method for fixing device having
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US9494904B2 (en) 2014-10-29 2016-11-15 Ricoh Company, Ltd. Separation device, fixing device, and image forming apparatus
JP6634713B2 (en) 2015-06-10 2020-01-22 株式会社リコー Fixing device and image forming device
JP2017072683A (en) 2015-10-06 2017-04-13 株式会社リコー Separation auxiliary mechanism, fixing device and image forming device

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JP3023978B2 (en) * 1990-11-02 2000-03-21 キヤノン株式会社 Image forming device
US6477350B1 (en) * 1998-07-21 2002-11-05 Copyer Co., Ltd. Fixation unit having contact and pressure rollers
JP5224664B2 (en) * 2006-08-09 2013-07-03 キヤノン株式会社 Image heating device
JP4987906B2 (en) * 2009-04-28 2012-08-01 株式会社波多製作所 Hairline processing equipment
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