JP2014145858A - Fixing pad, fixing device, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing pad that further suppresses, compared to a prior art, wrinkles due to thermal expansion of a slide sheet at a nip part entrance of a nip part at which an unfixed toner image on a recording material is fixed.SOLUTION: A fixing pad 10 includes a housing 12, a slide sheet 14 that is fixed to an outer peripheral surface of the housing 12 at both ends so as to provide a slide surface 15, and tensile force providing members 16a and 16b that are provided between one fixed end part of the slide sheet 14 and the slide surface 15 to provide tensile force to the slide sheet 14.

Description

  The present invention relates to a fixed pad, a fixing device, and an image forming apparatus.

  Conventionally, in an image forming apparatus such as an electrophotographic copying machine or printer, a process for fixing an unfixed toner image held on a recording medium such as paper on the recording medium to form an image is called a fixing process. It is out. Conventionally, methods such as pressure fixing, oven fixing, and solvent fixing are used as the fixing step, but heat is effectively transmitted, the toner image is fixed more firmly, and is relatively safe. From the viewpoint, the thermal pressure fixing method is most commonly used. In this thermal pressure fixing method, a recording medium on which an unfixed toner image is held is passed through a nip constituted by two heated rolls or belts, and when the nip passes, the recording medium is heated by the rolls or belts to be in a molten state. This is a method in which a toner image is fixed on a recording medium by pressing the unfixed toner image that has been pressed against the recording medium with a nip pressure.

  For example, when thermal pressure fixing is performed by passing a recording medium between a fixing belt and a fixing roll, the nip region on the inner side of the fixing belt (that is, the surface side not in contact with the recording medium) is slid with the fixing belt. A sliding portion that moves and promotes pressing of the fixing belt to the recording medium side is provided, and the sliding portion is provided with a sliding sheet that directly contacts the inside of the fixing belt (for example, Patent Documents). 1).

JP 2005-84484 A

  An object of the present invention is to provide a fixed pad, a fixing device, and a fixing pad, in which wrinkles due to thermal expansion of a sliding sheet are suppressed at a nip portion entrance of a nip portion for fixing a toner image on a recording medium on which an unfixed toner image is placed. An object is to provide an image forming apparatus.

  As a result of intensive studies to solve the above problems, the present invention has been reached as follows.

  (1) Between a casing, a sliding sheet having both ends fixed to the outer peripheral surface of the casing so as to provide a sliding surface, and one fixed end of the sliding sheet and the sliding surface And a tension applying member that applies tension to the sliding sheet.

  (2) The fixed pad according to (1), wherein the tension applying member is provided on both sides of the sliding sheet.

  (3) The unfixed toner by sandwiching a rotatable rotating member and a recording medium which is disposed in pressure contact with the rotating member and holds an unfixed toner image in a nip formed between the rotating member. A rotatable fixing belt for fixing an image on the recording medium, and an entrance of a nip portion provided on the opposite side of the fixing belt to the recording medium contact surface and press-contacting the recording medium on which the unfixed toner image is placed A fixing device having a fixing pad according to (1) or (2), wherein a tension applying member is disposed on the side.

  (4) a latent image forming means for forming a latent image on the image holding member, a developing means for developing the latent image using a developer for developing an electrostatic image, and the developed toner image via an intermediate transfer member. The image forming apparatus includes: a transfer unit that transfers the toner image on the transfer body; and a fixing unit that fixes the toner image on the transfer body. The fixing unit is described in (3) above. The image forming apparatus includes a fixing device.

  According to the invention described in claim 1 of the present application, wrinkles due to thermal expansion of the sliding sheet are suppressed as compared with the case where this configuration is not provided.

  According to the invention described in claim 2 of the present application, wrinkles due to thermal expansion of the sliding sheet are suppressed as compared with the case where this configuration is not provided.

  According to the third aspect of the present invention, the thermal expansion of the sliding sheet at the nip portion entrance of the nip portion for fixing the toner image on the recording medium on which the unfixed toner image is mounted, as compared with the case without this configuration. And the unevenness of the fixing pressure of the fixing belt at the entrance to the nip is suppressed.

  According to the fourth aspect of the present invention, the thermal expansion of the sliding sheet at the entrance to the nip portion of the nip portion for fixing the toner image on the recording medium on which the unfixed toner image is mounted, as compared with the case without this configuration. And the unevenness of the fixing pressure of the fixing belt at the entrance to the nip is suppressed.

It is a side view which shows an example of a structure of the fixed pad in this invention. It is a partial fracture perspective view explaining an example of arrangement of a tension grant member in a fixed pad in the present invention. It is a partially broken perspective view explaining the other example of arrangement | positioning of the tension | tensile_strength provision member in the fixed pad in this invention. It is a partially broken perspective view explaining the other example of arrangement | positioning of the tension | tensile_strength provision member in the fixed pad in this invention. FIG. 2 is a schematic configuration diagram illustrating an example of a configuration of a fixing device according to the present invention. 1 is a schematic configuration diagram illustrating an example of a configuration of an image forming apparatus according to the present invention.

  A fixed pad, a fixing device, and an image forming apparatus according to an embodiment of the present invention will be described below.

[Fixed pad]
The fixed pad in the present embodiment is used in a fixing device described later, and the configuration thereof will be described below with reference to FIGS. 1 to 4. However, it is not limited to this illustration.

  As shown in FIG. 1, the fixed pad 10 of the present embodiment includes a housing 12, a sliding sheet 14 having both ends fixed to the outer peripheral surface of the housing 12 so as to provide a sliding surface 15, and a slide. Tension applying members 16 a and 16 b that are provided between one fixed end of the moving sheet 14 and the sliding surface 15 and apply tension to the sliding sheet 14. Further, both end portions of the sliding sheet 14 are fixed to the housing 12 by a plurality of fixing portions 18 via metal plates 19 respectively. And as the fixing | fixed part 18, a screw stop or a hook stop is mentioned, for example.

Here, for example, when a sliding sheet made of a resin obtained by embossing a single layer fluororesin sheet is used for the fixed pad 10, the thermal expansion coefficient of the sliding sheet made of a single layer fluororesin is 150 × 10 ^{−. On} the other hand, when the metal plate 19 that fixes the end of the sliding sheet 14 is made of SUS304, the coefficient of thermal expansion of the metal plate 19 is about 17 × 10 ⁻⁶ / ° C. That is, the sliding sheet 14 has a larger coefficient of thermal expansion than the metal plate 19. In such a case, when the fixing temperature is changed from 150 ° C. to 210 ° C., it is considered that the sliding sheet 14 is thermally expanded at other portions as compared with the end portion fixed by the metal plate 19 and wrinkles are generated. Therefore, by providing a tension applying member that applies tension to the sliding sheet 14 between one fixed end portion of the sliding sheet 14 where the wrinkles are generated and the sliding surface 15, the sliding member 14 slides from the one tension applying member. The wrinkle of the sliding sheet 14 in the portion reaching the moving surface 15 is suppressed. In the present specification, “wrinkle” includes undulation and undulation.

  As an example of the tension applying member, as shown in FIG. 1, a pair of plate-like tension applying members 16 a and 16 b provided between one fixed end portion of the sliding sheet 14 and the sliding surface 15. Is mentioned. Here, one of the pair of plate-like tension applying members 16a and 16b may contact the sliding sheet 14 to apply tension, and the other may be non-contacting the sliding sheet 14, and preferably a pair of plate-like tension applying members 16a and 16b. The tension applying members 16a and 16b are arranged so as to be sandwiched across the longitudinal direction of the sliding sheet 14 to such an extent that the sliding property of the sliding sheet 14 is not impaired.

  Moreover, the structure of the other tension | tensile_strength provision member in this Embodiment is demonstrated using FIGS. 2-4.

  As shown in FIG. 2, a cylindrical tension applying member 36 may be provided inside the sliding sheet 14 as a tension applying member. Here, the cylindrical tension applying member 36 may be fixed so as to apply a predetermined tension, but may be configured to follow the sliding of the sliding sheet 14 by the shaft 38.

  As shown in FIG. 3, a cylindrical tension applying member 36 may be provided outside the sliding sheet 14 as a tension applying member. Here, the cylindrical tension applying member 36 may be fixed so as to apply a predetermined tension, but may be configured to follow the sliding of the sliding sheet 14 by the shaft 38.

  Further, as shown in FIG. 4, a tension-applying member is used so that a curved portion is in contact with the inner side of the sliding sheet 14 with a plate-like tension applying member 46 having a semi-cylindrical cross section so as to apply a predetermined tension. On the other hand, the plate-like tension applying member 16 may be provided outside the sliding sheet 14.

  The tension applying member is not limited to the above-described configuration. For example, a cylindrical tension applying member 36 is provided on both the inside and the outside of the sliding sheet 14 to impair the sliding property of the sliding sheet 14. It may be inserted to the extent that it is not. Further, only the plate-like tension applying member 46 having a semi-cylindrical cross section may be provided on the inner side, the outer side, or both sides of the sliding sheet 14. Further, the tension applying member may be in surface contact or line contact with the sliding sheet 14 in order to suppress wrinkles. The material of the tension applying member is, for example, a metal such as stainless steel or Fe. The tension applied to the sliding sheet 14 by the tension applying member may be sufficient to extend wrinkles generated in the sliding sheet to a level that does not cause a problem in use, and may be appropriately changed depending on the sliding sheet material, thickness, and the like. Good.

  Moreover, the sliding sheet 14 in this Embodiment is not restricted to the sliding sheet which consists of resin which embossed the single layer fluororesin sheet mentioned above, The sliding which consists of a smooth surface of a single layer fluororesin sheet It may be a sheet.

[Fixing device]
The fixing device in the present embodiment will be described below with reference to FIG. Note that a fixing device that employs a belt-type induction heating method will be described as an example of the fixing device in this embodiment.

  As shown in FIG. 1, the fixing device 20 according to the present embodiment is disposed in pressure contact with a pressure roll 210 that is a rotatable rotating member, and a pressure roll 210 that is a rotating member. The unfixed toner image 30 is fixed to the recording medium P by sandwiching the recording medium P holding the unfixed toner image 30 in a pressure part N (hereinafter also referred to as “nip part N”) formed on The fixing belt 200 includes a fixing belt 200 and a sliding sheet 14 interposed between the fixing belt 200 and the fixed pad 10 serving as a pressing member.

  Here, the fixing pad 10 of the present embodiment described above is disposed on the opposite side of the contact surface of the fixing belt 200 with the recording medium P, and the nip portion N that presses the recording medium P on which the unfixed toner image 30 is placed. The tension applying members 16a and 16b are arranged on the inlet side of the. Needless to say, the tension applying member may be changed to any one of the configurations described above. In addition, the fixed pad 10 in the present embodiment incorporates a heater 17 that is a heating element.

  Further, the configuration of the fixing device 20 will be described with reference to FIG. The fixing belt 200 of the fixing device 20 is rotatably stretched between a tension roll 202, a heating roll 206 including a heater 208 that is a heating element, a tension roll 204, and the fixed pad 10 having the sliding sheet 14. It is built. The fixing belt 200 is brought into pressure contact with the pressure roll 210 at the pressure portion (nip portion) N and is rotated in the direction of arrow E following the pressure roll 210.

  The pressure roll 210 is, for example, a solid iron core (columnar core) having a diameter of 16 mm, a rubber layer such as a silicone sponge having a thickness of 12 mm, which covers the outer peripheral surface of the core, and a thickness of, for example, And a surface layer of a heat-resistant resin coating such as 30 μm PFA or a heat-resistant rubber coating. In addition, as a manufacturing method of the pressure roll 210, for example, a fluororesin tube in which an adhesion primer is applied and a solid shaft (which becomes a core) are formed on the inner peripheral surface of a PFA tube (which becomes a surface layer). Set in mold, inject liquid silicone rubber between fluororesin tube and solid shaft, then vulcanize and foam silicone rubber by heat treatment (eg 150 ° C, 2 hours) to form rubber layer The method of doing is mentioned.

  The pressure roll 210 is disposed so as to face the fixing belt 200, and rotates in the direction of arrow D at a process speed of, for example, 140 mm / sec to 400 mm / sec to drive the fixing belt 200. Further, the pressure belt N is held by the pressure roll 210 and the fixed pad 10 to form a pressure portion N, and a recording medium P holding an unfixed toner image is passed through the pressure portion N. Then, heat and pressure are applied to fix the unfixed toner image on the recording medium P.

  For example, a radiation lamp heating element or a resistance heating element is used as the heating element of the present embodiment. Examples of the radiant lamp heating element include a halogen lamp. Examples of the resistance heating element include iron-chromium-aluminum, nickel-chromium, platinum, molybdenum, tantalum, tungsten, silicon carbide, molybdenum-silicide, and carbon.

  In the fixing device 20, the fixing belt 200 is driven to rotate in accordance with the rotation of the pressure roll 210 in the direction of arrow D, and is heated in advance by the heater 208 of the heating roll 206, and the fixing belt 200 is heated by the heater 17 in the fixed pad 10. The outer peripheral surface is heated to a temperature at which fixing is possible. The fixing belt 200 heated in this way moves to the pressure part N with the pressure roll 210. The recording medium P having the unfixed toner image 30 provided on the surface thereof is carried into the fixing device 20 by a conveying means via a fixing inlet guide (not shown). When the recording medium P passes through the pressure part N of the fixing belt 200 and the pressure roll 210, the unfixed toner image 30 is heated by the fixing belt 200 and fixed on the surface of the recording medium P. Thereafter, the recording medium P on which the image is formed is transported by the transport unit and discharged from the fixing device 20. The fixing belt 200 having finished the fixing process at the pressurizing unit N and whose surface temperature on the outer peripheral surface has decreased rotates in the direction of arrow E and is heated again in preparation for the next fixing process.

  Here, the fixing pad 10 in the fixing device 20 is disposed on the side opposite to the contact surface of the fixing belt 200 with the recording medium P, and the inlet side of the nip portion N that presses the recording medium P on which the unfixed toner image 30 is placed. In addition, since the tension applying members 16a and 16b are arranged, the nip portion entrance I (see FIG. 5) of the pressurizing portion (nip portion) N that fixes the toner image onto the recording medium P on which the unfixed toner image 30 is placed. It is considered that wrinkles due to thermal expansion of the sliding sheet 14 in a portion surrounded by a broken line are suppressed, and uneven fixing pressure of the fixing belt at the nip portion entrance I is suppressed. In addition, since the raised portion corresponding to the wrinkle of the sliding sheet 14 at the nip entrance I does not contact the fixing belt 200, it is presumed that the occurrence of image shading is suppressed.

[Image forming apparatus]
FIG. 6 shows a schematic configuration of an image forming apparatus to which the endless belt, the fixing belt, and the fixing device according to the present embodiment are applied. Here, an intermediate transfer type image forming apparatus generally called a tandem type will be described as an example.

  An image forming apparatus 100 shown in FIG. 6 includes a plurality of image forming units 1Y, 1M, 1C, and 1K that form toner images of respective color components by an electrophotographic method as an example of an image forming unit including a latent image forming unit and a developing unit. Is provided. Next, as an example of the transfer unit, the image forming apparatus 100 sequentially transfers (primary transfer) each color component toner image formed by each image forming unit 1Y, 1M, 1C, 1K to an intermediate transfer belt (image holding member) 75. ) And a secondary transfer unit 60 that collectively transfers (secondary transfer) the superimposed toner image transferred onto the intermediate transfer belt 75 onto a sheet of recording medium P (recording material). Further, the image forming apparatus 100 includes the above-described fixing device 20 that fixes the secondary transferred image on the recording medium P as an example of a fixing unit. Further, the image forming apparatus 100 includes a control unit 40 that controls the operation of each device (each unit).

  As shown in FIG. 6, each of the image forming units 1Y, 1M, 1C, and 1K includes a photosensitive drum 71 that rotates in the direction of arrow A, a charger 72 that charges the photosensitive drum 71, and a photosensitive drum 71. It has a laser exposure device 73 for writing an electrostatic latent image, and a developing device 74 that accommodates each color component toner and visualizes the electrostatic latent image on the photosensitive drum 71 with the toner. Also, a primary transfer roll 76 that transfers each color component toner image formed on the photosensitive drum 71 to the intermediate transfer belt 75 by the primary transfer unit 70, a drum cleaner 77 that removes residual toner on the photosensitive drum 71, and Have These image forming units 1Y, 1M, 1C, and 1K are arranged substantially linearly in the order of yellow (Y), magenta (M), cyan (C), and black (K) from the upstream side of the intermediate transfer belt 75. ing.

  The intermediate transfer belt 75 is driven to circulate in the direction of arrow B shown in FIG. 6 by various rolls. As various rolls, a drive roll 31 that drives the intermediate transfer belt 75, a support roll 32 that supports the intermediate transfer belt 75, a tension roll 33 that applies a constant tension to the intermediate transfer belt 75 to prevent meandering, and a secondary transfer. The backup roll 25 provided in the section 60 and the cleaning backup roll 34 provided in the cleaning section for scraping the residual toner on the intermediate transfer belt 75 are provided.

  The primary transfer unit 70 includes a primary transfer roll 76 that faces the photosensitive drum 71 with the intermediate transfer belt 75 interposed therebetween. The secondary transfer section 60 is disposed on the back surface side of the intermediate transfer belt 75 as a secondary transfer roll (transfer member) 22 disposed on the toner image holding surface side of the intermediate transfer belt 75 and a counter electrode of the secondary transfer roll 22. And a power supply roll 26 that applies a secondary transfer bias to the backup roll 25.

  An intermediate transfer belt cleaner 35 for removing residual toner and paper dust on the intermediate transfer belt 75 is provided on the downstream side of the secondary transfer unit 60. A reference sensor (home position sensor) 42 that generates a reference signal for taking an image forming timing in each of the image forming units 1Y, 1M, 1C, and 1K is disposed upstream of the yellow image forming unit 1Y. Further, an image density sensor 43 for adjusting image quality is disposed on the downstream side of the black image forming unit 1K.

  The recording medium transport system includes a recording medium container 50, a pickup roll 51 that takes out and transports the recording medium P in the recording medium container 50, a transport roll 52 that transports the recording medium P, and a recording medium P. A conveyance chute 53 to be sent to the next transfer unit 60, a conveyance belt 55 for conveying the recording medium P secondarily transferred by the secondary transfer roll 22 to the fixing device 20, and a fixing inlet for guiding the recording medium P to the fixing device 20. And a guide 56.

  A basic image forming process of the image forming apparatus 100 will be described. In the image forming apparatus 100 as shown in FIG. 6, after image processing is performed on image data output from an image reading device (not shown) or the like, the image data is converted into four colors Y, M, C, and K. It is converted into material gradation data and output to the laser exposure device 73. The laser exposure unit 73, for example, each photosensitive drum that rotates the exposure beam Bm emitted from the semiconductor laser in the direction of arrow A of the image forming units 1Y, 1M, 1C, and 1K according to the input color material gradation data. 71 is irradiated. After the surface of each photosensitive drum 71 is charged by the charger 72, the surface is scanned and exposed by the laser exposure unit 73 to form an electrostatic latent image. The formed electrostatic latent image is developed as a toner image of each color of Y, M, C, and K by each of the image forming units 1Y, 1M, 1C, and 1K.

  Next, the toner image formed on the photosensitive drum 71 is sequentially superimposed on the surface of the intermediate transfer belt 75 in the primary transfer unit 70 to perform primary transfer. The intermediate transfer belt 75 moves in the direction of arrow B and conveys the toner image to the secondary transfer unit 60. The recording medium conveyance system supplies the recording medium P from the recording medium container 50 in accordance with the timing at which the toner image is conveyed to the secondary transfer unit 60. The secondary transfer unit 60 electrostatically transfers the unfixed toner image held on the intermediate transfer belt 75 onto the recording medium P sandwiched between the intermediate transfer belt 75 and the secondary transfer roll 22. Thereafter, the recording medium P on which the toner image has been electrostatically transferred is conveyed to the fixing device 20 by the conveying belt 55, and the fixing device 20 processes the unfixed toner image on the recording medium P with heat and pressure and applies it onto the recording medium P. To settle. The recording medium P on which the fixed image has been formed is conveyed to a paper discharge placement unit provided in the discharge unit of the image forming apparatus.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict | limited to a following example. The evaluations described in the following production examples, examples and comparative examples were carried out by the following methods.

[Comparative Example 1]
In the fixing device shown in FIG. 5, in which the tension applying members 16 a and 16 b are not provided, a sliding sheet having a thickness of 0.3 mm, a width of 370 mm, and a length of 70 mm is used as the sliding sheet. The end on the upstream side when the sliding sheet is slid is fixed with a screw as the fixing portion 18 using a metal plate 19 made of SUS304. The entire fixing belt 200 is heated by the heater 208 of the heating roll 206 and the heater 17 of the fixed pad 10 while the fixing belt 200 is stretched and rotated by the pressure roll 210. When the temperature of the nip portion N reaches 170 ° C., the outer peripheral speed of the pressure roll 210 is adjusted to 400 mm / sec, a recording medium P having an unfixed toner image on the entire surface is inserted into the nip portion entrance I, and toner is recorded. Fix to medium P. Here, when the image of the discharged recording medium is observed, the density of the image is visually observed in the process direction (conveyance direction). When the fixing device is observed, the fixing belt 200 is aligned in the axial direction of the pressure roll 210 in FIG. When the heating is performed with the fixing belt 200 removed, the sliding sheet is undulated between the metal plate 19 that fixes the upstream end of the sliding sheet and the nip entrance I. .

[Example 1]
5 is the same as the comparative example 1 except that tension applying members 16a and 16b are provided between the upstream metal plate 19 and the nip portion N when the sliding sheet 14 slides. The configuration was tested. Each of the pair of tension applying members 16a and 16b is a metal plate, and a sliding sheet having a clearance of 0.4 mm and a thickness of 0.3 mm is sandwiched between the tension applying members 16a and 16b. It is in form. When the image of the discharged recording medium is observed, there is no contrast of the image in the process direction, and even when the fixing device is observed, the fixing belt 200 does not swell, and if the heating is performed with the fixing belt 200 removed, the sliding sheet The sliding sheet undulates between the metal plate 19 on the upstream side and the tension applying members 16a and 16b, but there is no undulation of the sliding sheet between the tension applying members 16a and 16b and the nip portion inlet I. It was.

[Example 2]
In the fixing device having the configuration shown in FIG. 5, tension applying members 16 a and 16 b are provided between the upstream metal plate 19 and the nip portion N when the sliding sheet 14 slides, and the sliding surface of the sliding sheet is provided. The test was performed with the same configuration as Comparative Example 1 except that a sliding sheet subjected to embossing with a surface roughness Ra of 0.2 to 4.0 was used. Each of the pair of tension applying members 16a and 16b is a metal plate, and a sliding sheet having a clearance of 0.4 mm and a thickness of 0.3 mm is sandwiched between the tension applying members 16a and 16b. It is in form. When the image of the discharged recording medium is observed, there is no contrast of the image in the process direction, and even when the fixing device is observed, the fixing belt 200 does not swell, and if the heating is performed with the fixing belt 200 removed, the sliding sheet The sliding sheet undulates between the metal plate 19 on the upstream side and the tension applying members 16a and 16b, but there is no undulation of the sliding sheet between the tension applying members 16a and 16b and the nip portion inlet I. It was.

[Example 3]
In the fixing device having the configuration shown in FIG. 5, a cylindrical tension applying member 36 as shown in FIG. 2 is provided between the upstream metal plate 19 and the nip portion N when the sliding sheet 14 slides. The test was performed with the same configuration as in Comparative Example 1 except for the above. The cylindrical tension applying member 36 is made of metal, is disposed so as to apply tension to the sliding sheet 14, and is rotatably provided so as to follow when the sliding sheet 14 slides. . When the image of the discharged recording medium is observed, there is no contrast of the image in the process direction, and even when the fixing device is observed, the fixing belt 200 does not swell, and if the heating is performed with the fixing belt 200 removed, the sliding sheet The sliding sheet undulates between the upstream metal plate 19 and the tension applying member 36, but no sliding sheet undulates between the tension applying member 36 and the nip portion inlet I.

  As an application example of the present invention, there is application to an image forming apparatus such as a copying machine or a printer using an electrophotographic system.

  1Y, 1M, 1C, 1K Image forming unit, 10 fixing pad, 12 housing, 14 sliding sheet, 15 sliding surface, 16, 16a, 16b, 36, 46 tension applying member, 17, 208 heater, 18 fixing portion , 19 Metal plate, 20 Fixing device, 22 Secondary transfer roll, 25 Backup roll, 26 Power supply roll, 30 Unfixed toner image, 31 Drive roll, 32 Support roll, 33 Tension roll, 34 Cleaning backup roll, 35 Intermediate transfer belt Cleaner, 38 axes, 40 control unit, 42 reference sensor, 43 image density sensor, 50 recording medium storage unit, 51 pickup roll, 52 transport roll, 53 transport chute, 55 transport belt, 56 fixing inlet guide, 60 secondary transfer unit , 70 Primary transfer section, 71 Photosensitive drum, 7 2 Charging device, 73 Laser exposure device, 74 Developer, 75 Intermediate transfer belt, 76 Primary transfer roll, 77 Drum cleaner, 100 Image forming device, 200 Fixing belt, 202, 204 Stretch roll, 206 Heating roll, 210 Pressurization Roll, I nip entrance, N nip (pressurizing part), P recording medium.

Claims (4)

A housing,
A sliding sheet having both ends fixed to the outer peripheral surface of the housing so as to provide a sliding surface;
A tension applying member that is provided between one fixed end of the sliding sheet and the sliding surface and applies tension to the sliding sheet;
A fixed pad comprising:   The fixed pad according to claim 1, wherein the tension applying member is provided on both sides of the sliding sheet. A rotatable rotating member;
A rotation that is arranged in pressure contact with the rotating member and fixes the unfixed toner image on the recording medium by sandwiching a recording medium holding an unfixed toner image in a nip formed between the rotating member and the rotating member. Possible fixing belts,
The tension applying member is disposed on an inlet side of a nip portion that is provided on a side opposite to the recording medium contact surface of the fixing belt and presses the recording medium on which the unfixed toner image is placed. The fixing pad according to Item 2,
A fixing device. A latent image forming unit for forming a latent image on the image holding member; a developing unit for developing the latent image using a developer for developing an electrostatic image; and a developed toner image via or via an intermediate transfer member. An image forming apparatus including a transfer unit that transfers the toner image on the transfer body, and a fixing unit that fixes the toner image on the transfer body,
An image forming apparatus, wherein the fixing unit includes the fixing device according to claim 3.

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