JP2016161751A - Fixing device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device that can prevent a slide member from coming off, and an image forming apparatus.SOLUTION: There is provided a fixing device 10 comprising: a rotary body 66; an endless belt-like body 72 that is in contact with the rotary body 66 to form a contact area 102; a heat source 86 that heats the contact area 102; a holding body 100 that rotatably holds the endless belt-like body 72 inside the endless belt-like body 72; and a slide member 124 that is provided between the endless belt-like body 72 and the holding body 100 and on which the endless belt-like body 72 slides, where a projection part 114 is formed on either one of the holding body 100 and the slide member 124 and a recess part 126 is formed on the other; the projection part 114 and the recess part 126 are fitted to each other and thereby the slide member 124 is fixed to the holding body 100; the fixing device 10 includes a prevention member 128 that prevents the fitting of the projection part 114 and the recess part 126 from being released.SELECTED DRAWING: Figure 3

Description

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

  As an invention of a fixing device, for example, in Patent Document 1 below, a rotatable endless fixing member, a heat source for heating the fixing member, and an outer peripheral side of the fixing member are arranged so as to be in pressure contact with the fixing member. A fixing member disposed on the inner peripheral side of the fixing member, and a nip forming member that presses against the pressing member via the fixing member to form a nip portion, and is fixed to an inner diameter portion of the fixing member And a reinforcing member that supports the nip forming member from the side opposite to the nip portion, and has a sliding sheet between the nip forming member and the inner peripheral surface of the fixing member, A fixing device is disclosed in which the sliding sheet is held in a state of being in close contact with a surface on the nip portion side of the nip forming member by holding means provided on a member different from the nip forming member. Yes.

  Patent Document 2 below discloses a fixing device for fixing a toner image carried on a recording medium, the surface of which is elastically deformed, a rotational member that is rotationally driven, and an endless that is in contact with the rotational member. A fixing belt formed in a belt shape, a soft pad member that is inside the fixing belt and applies a predetermined pressure to the rotating member by pressing the rotating member via the fixing belt; A locking member projecting in a protruding shape at each of a plurality of positions on a straight line along the longitudinal direction; a pad member main body that supports the soft pad member inside the fixing belt; Each of the locking pieces has a plurality of engaging holes to be engaged therewith, and is wound around the pad member main body so as to cover the soft pad member so as to face the fixing belt. A low-friction sheet member to be placed, a lubricant application member that replenishes the lubricant by sliding contact with the inner peripheral surface of the fixing belt, and a relief groove for loosely inserting the locking piece are formed through the elastic sheet member. And a holder member for supporting the lubricant application member on the opposite side of the pad member body, and the low friction sheet member is made of a woven fabric of weft and warp. A fixing device for an electrophotographic system is disclosed.

JP 2014-048487 A JP 2010-282237 A

  An object of the present invention is to provide a fixing device and an image forming apparatus that can prevent a sliding member from coming off.

  According to a first aspect of the present invention, there is provided a fixing device comprising: a rotating body; an endless belt that contacts the rotating body to form a contact area; a heating source that heats the contact area; and an interior of the endless band. And a holding member that rotatably holds the endless belt, and a sliding member that is provided between the endless belt and the holding member, and on which the endless belt slides. A convex portion is formed on one of the sliding members, and a concave portion is formed on the other. The convex portion and the concave portion are fitted together, and the sliding member is fixed to the holding body. The convex portion and the concave portion And a fixing device having a preventing member that prevents the fitting with the member from being released.

  The fixing device according to claim 2, wherein the prevention member is impregnated with a lubricant, and the inner surface side of the endless belt is in contact with the prevention member. Device.

  The fixing device according to a third aspect of the present invention is the fixing device according to the first or second aspect, wherein the prevention member is in contact with a tip end side of the convex portion.

  According to a fourth aspect of the present invention, there is provided the fixing device in which the first height of the prevention member and the convex portion of the holding body adjacent to the prevention member are formed in the radial direction of the endless belt. 4. The fixing device according to claim 1, wherein the first height of the prevention member is higher when the second height in which the thickness of the sliding member is combined is compared with the second height. is there.

  The fixing device according to a fifth aspect of the present invention is the fixing device, wherein the endless belt-like body is a portion in which the convex portion of the holding body adjacent to the prevention member is combined with the thickness of the sliding member. The fixing device according to claim 1, wherein the fixing device is separated from the fixing device.

  A fixing device according to a sixth aspect of the present invention is an image forming apparatus including the fixing device according to any one of the first to fifth aspects.

  According to the first aspect of the present invention, the sliding member can be prevented from coming off.

  According to the present invention of claim 2, in addition to the effect of the present invention of claim 1, a lubricant can be supplied to the endless belt.

  According to the present invention of claim 3, in addition to the effect of the present invention of claim 1 or 2, it is possible to prevent the prevention member from being deformed by the rotation of the endless belt-like body.

  According to the fourth aspect of the present invention, in addition to the effect of the present invention according to any one of the first to third aspects, the endless belt-like body hits the portion where the convex portion and the sliding member are attached to the convex portion. Damage to the endless belt and the sliding member can be prevented.

  According to the fifth aspect of the present invention, in addition to the effect of the present invention according to the fourth aspect, it is possible to prevent a tensile force from the endless belt from being directly applied to the portion attached to the convex portion of the sliding member. it can.

  According to the sixth aspect of the present invention, an image forming apparatus including the fixing device having the effect of the present invention according to any one of the first to fifth aspects can be obtained.

1 is a side sectional view showing an image forming apparatus according to an embodiment. FIG. 3 is a side cross-sectional view illustrating the fixing device according to the embodiment. FIG. 3 is a side cross-sectional view illustrating a pressure unit of the fixing device according to the embodiment. It is an expanded sectional view of the IV section of FIG. It is a perspective view of the pressurization part concerning an embodiment. FIG. 6A is a front view of the sliding member, and FIG. 6B is an enlarged front view of a part of the pressure unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a fixing device and an image forming apparatus for embodying the technical idea of the present invention, and is not intended to specify the present invention. Other embodiments within the scope of the claims are equally applicable.

[Embodiment]
An image forming apparatus 10 according to the embodiment will be described with reference to FIGS. As shown in FIG. 1, the image forming apparatus 10 according to the embodiment includes an image forming apparatus main body 12, and at least one paper feeding unit 18, an image forming unit 14, and the inside of the image forming apparatus main body 12. The image forming apparatus main body 12 has a discharge port 34 mounted thereon, and a conveyance path 32 through which a recording medium 130 such as a recording sheet serving as a transfer material is conveyed is provided to communicate with the fixing device 36. It has been. In addition, as will be described later, the image forming apparatus 10 according to the embodiment includes a free belt nip fusing (FBNF) that is pressed by two different pressing forces by a pressing unit 76 provided in the fixing device 36. )) System configuration. Each configuration will be described below.

  The paper feeding unit 18 includes a paper feeding unit main body 20, a paper feeding cassette 22 in which a recording medium 130 as a transfer material is accommodated, a pickup roll 24 that pulls out the recording medium 130 loaded in the paper feeding cassette 22, and a recording medium 130. A feed roll 28 and a retard roll 26 which are fed while being rolled are disposed. By the rotation of the pickup roll 24, the feed roll 28 and the retard roll 26, the recording medium 130 loaded on the paper feed cassette 22 is conveyed along a conveyance path 32 to a registration roll 38 which will be described later. The paper feed cassette 22 is detachably attached to the paper feed unit main body 20. Further, the number of paper feeding units may be one, or a plurality of paper feeding units may be provided, but in the embodiment, two paper feeding units 18 are provided as shown in FIG.

  The image forming unit 14 is of an electrophotographic type, and includes an image carrier 44 made of a photosensitive member, a charging device 56 made of, for example, a charging roll that uniformly charges the image carrier 44, and charging by the charging device 56. An optical writing device 58 for writing a latent image on the image holding member 44 by light, and a developing device 60 having a developing roll so that the latent image of the image holding member 44 formed by the optical writing device 58 is visualized by toner. The toner image is transferred to the recording medium 130 by the developing device 60. The transfer device 42 is composed of a transfer roll, the cleaning device 62 is for cleaning the toner remaining on the image carrier 44, and the recording medium is transferred by the transfer device 42. The fixing unit 36 fixes the toner image on the recording medium.

  The optical writing device 58 includes, for example, a scanning laser exposure device, and forms a latent image on the image holding member 44 across a process cartridge 64 described later. The optical writing device 58 can use an LED, a surface emitting laser, or the like as another embodiment.

  In the process cartridge 64, the image carrier 44, the charging device 56, the developing device 60, and the cleaning device 62 are integrated, and these can be replaced as a unit. The process cartridge 64 can be removed from the image forming apparatus main body 12 by opening the discharge unit 16.

  The conveyance path 32 is a path of the recording medium 130 that communicates from the pickup roll 24 of the paper feeding unit 18 at the lower part of the image forming apparatus body 12 to the discharge port 34 at the upper part of the image forming apparatus body 12. The conveyance path 32 has a portion that is formed in the image forming apparatus main body 12 and is formed substantially vertically from the pickup roll 24 of the lower sheet feeding unit 18 to the fixing device 36.

  A transfer device 42 and an image holding body 44 are disposed on the upstream side of the fixing device 36 in the conveyance path 32, and a registration roll 38 is further disposed on the upstream side of the transfer device 42 and the image holding body 44. Further, a discharge roll 40 is disposed in the vicinity of the discharge port 34 of the conveyance path 32.

  Therefore, the recording medium 130 sent out from the paper feed cassette 22 of the paper feed unit 18 by the pickup roll 24 is turned by the retard roll 26 and the feed roll 28 and guided to the transport path 32, and is temporarily stopped by the registration roll 38. The developer image is transferred between the transfer device 42 and the image holding member 44 at a timing, and the transferred developer image is fixed by the fixing device 36, and is discharged from the discharge port 34 by the discharge roller 40. 16 is discharged.

  2 to 6, the fixing device 36 includes a heating roll 66 as a rotating body having a heating source (heater), an endless belt 72 as an endless belt, and the endless belt 72 that is rotatable. And a pressure member 76 that is disposed inside the endless belt 72 and that presses the endless belt 72 toward the heating roll 66.

  The heating roll 66 has a cylindrical roll portion 84 and a heater 86 disposed in the roll portion 84. The roll part 84 is supported by a bearing for heating rolls (not shown) so as to be rotatable, and rotates in the direction of arrow A (see FIG. 2). The roll portion 84 includes a core 88 made of a metal material such as iron, stainless steel, and aluminum, and a release layer 90 that is coated or applied to the core 88, and has a so-called hard roll having no elastic layer. It has become. The core 88 has an outer shape of, for example, 25 mm and a wall thickness of, for example, 0.7 mm. The release layer 90 is made of an insulating material having excellent release properties, such as PFA, and has a film thickness of, for example, 20 μm.

  A plurality of (for example, five) peeling claws 92 are in contact with the roll portion 84. The heater 86 as a heating source is composed of, for example, two lamps. A thermostat 94 is provided on the opposite side of the heating roll 66 from the endless belt 72 so as to face the heating roll 66.

  The heating roll may have a so-called flare shape. When the flare shape is used, the recording medium is conveyed while being pulled to both ends. Therefore, the pressing width for pressing both ends in the axial direction of the heating roll is wider than the central portion, and the recording medium is picked up from both ends. The occurrence of wrinkles and the like is suppressed.

  The endless belt 72 is provided between the heating roll 66 and the pressure unit 76, and travels in the direction of arrow C following the rotation of the heating roll 66 (see FIG. 2). When the heating roll 66 and the endless belt 72 are in pressure contact with each other by the pressure unit 76, a contact area 102 is formed, and the toner image is fixed on the recording medium 130 by the contact area 102. The endless belt 72 is formed of, for example, a synthetic resin such as polyimide into an endless belt shape having a thickness of 75 μm, for example, and a release layer made of PFA or the like is provided on the surface.

  An inlet chute 96 is provided on the upstream side of the contact region 102. The recording medium 130 conveyed in the direction of arrow B is guided to the inlet chute 96, and the leading end of the recording medium 130 is guided to the contact area 102 (see FIG. 2). An outlet chute 98 is provided on the downstream side of the contact area 102.

  As shown in FIGS. 2 to 6, the pressure unit 76 includes a holding body 100 disposed inside the endless belt 72, a pressure member 122 attached to the holding body 100, and a frame that supports the holding body 100. 78, 79, and provided between the endless belt 72 and the holding body 100, and the sliding member 124 for reducing the friction between the endless belt 72 and the holding body 100 and the sliding member 124 are prevented from coming off. A prevention member 128 is provided.

  Further, the contact region 102 of the pressurizing unit 76 formed by being pressed by the heating roll 66 includes a pressurizing portion 104 formed on the holding body 100 described later and a pressurizing member 122 attached to the holding body 100. It is formed by being pressed by the heating roll 66. The pressurizing unit 76 is configured such that the holding body 100 and the frames 78 and 79 cooperate to press the pressing portion 104 and the pressing member 122 together with the holding body 100 toward the heating roll 66.

  The holding body 100 is formed of a resin material, for example, LCP (liquid crystal polymer) having high heat resistance. As shown in FIGS. 2 and 3, the holding body 100 includes a pressure portion 104 that forms the contact region 102 on the side facing the heating roll 66, and a pressure member that forms the contact region 102 together with the pressure portion 104. And a seating surface 106 to which 122 is attached.

  The pressurizing portion 104 is formed such that the side of the holding body 100 in contact with the heating roll 66 protrudes toward the heating roll 66 along the longitudinal direction, and is provided on the downstream side in the rotation direction of the endless belt 72.

  The seating surface 106 is formed in a groove shape that is recessed along the longitudinal direction of the holding body 100, and is provided on the upstream side in the rotation direction of the endless belt 72 relative to the pressing portion 104. Then, the pressure member 122 is attached to the groove-shaped recess of the seat surface 106.

  The holding body 100 is formed with an extending portion 108 extending in the direction opposite to the rotation direction of the endless belt 72 over the longitudinal direction of the holding body 100. On the opposite side of the side facing the roll 66, a plurality of convex portions 114 to which the sliding member 124 is attached and a prevention member arrangement portion 120 in which a prevention member 128 provided along the longitudinal direction of the holding body 100 is arranged. Have.

  Furthermore, the extending portion 108 of the holding body 100 has a bottom surface portion 118 on which the prevention member arranging portion 120 is provided, and a stepped step portion 110 formed so as to be higher by one step than the bottom surface portion 118. have. The step portion 110 has a wall surface portion 112 formed in a wall shape from the bottom surface portion 118.

  The plurality of convex portions 114 are formed so that the rod-shaped body protrudes from the side opposite to the side facing the heating roll 66 of the holding body 100, that is, the back side of the contact region 102 of the holding body 100. The plurality of convex portions 114 are formed on the wall surface portion 112 of the stepped portion 110 formed in the extending portion 108 so as to protrude in the direction opposite to the rotation direction of the endless belt 72. In addition, although embodiment has shown the case where the convex part is four, not only this but it is good also as arbitrary numbers.

  In addition, the bottom surface portion 118 of the extending portion 108 is provided with a prevention member arrangement portion 120 where the prevention member 128 is arranged. This prevention member arrangement | positioning part 120 is made into the position where the prevention member 128 attached is in contact with the front-end | tip part 116 of the some convex part 114. As shown in FIG.

  The pressure member 122 is formed by bending a metal plate having a length substantially the same as the length of the holding body 100 in the longitudinal direction, and is configured as a spring having elasticity. The pressure member 122 is attached to the seat surface 106 formed on the holding body 100. At this time, the pressure member 122 is attached such that the bent side is disposed on the upstream side in the rotation direction of the endless belt 72. The pressing member 122 may be formed with a plurality of slits in a direction orthogonal to the longitudinal direction. Further, the pressure member may be a pressure pad made of a resin material.

  As shown in FIGS. 5 and 6A, the sliding member 124 is formed in a sheet shape, is provided between the endless belt 72 and the holding body 100, and the sliding surface is an inner peripheral surface of the endless belt 72. It is wound around the holding body 100 so as to come into contact. The sliding member 124 is formed of, for example, a sheet-like member having a smooth surface such as polyimide, and uneven portions due to embossing are formed on the portion of the sliding member 124 that is pressed against the pressure portion 104 and the heating roll 66. You may make it form.

  On one end side of the sliding member 124, a plurality of concave portions 126 are formed so that the plurality of convex portions 114 formed on the holding body 100 are inserted. The recess 126 is oval in FIG. 6A, but may have another shape such as a rectangle or a circle so as to correspond to the shape of the projection formed on the holding body.

  The other end side of the sliding member 124 is a free end. Note that the length of the sliding member 124 is set so as to extend at least beyond the contact region 102 toward the downstream side in the rotation direction when the sliding member 124 is wound around the holding body 100.

  As shown in FIGS. 3 to 6, the preventing member 128 has a length substantially the same as the length of the holding body 100 in the longitudinal direction, and is formed of a rod-shaped body having a rectangular cross section. Further, the prevention member 128 is impregnated with a lubricant, and the lubricant is supplied between the sliding member 124 and the endless belt 72. Therefore, the prevention member 128 is made of a material that can be impregnated with a lubricant, for example, a fiber material such as felt.

  In addition, the sliding member 124 and the prevention member 128 are attached to the holding body 100, first, a plurality of convex portions 114 formed on the holding body 100 and a plurality of concave portions 126 formed on one end side of the sliding member 124. Fit and fix. (Fixed here also includes a state in which movement is possible only within a certain region.) Thereafter, the prevention member placement portion 120 of the holding body 100 is held in contact with the tip portions 116 of the plurality of convex portions 114. The prevention member 128 is attached along the longitudinal direction of the body 100. Then, the other end side of the sliding member 124 is wound around the holding body 100 (see FIGS. 5 and 6B).

  Further, in the radial direction of the endless belt, a first height of the prevention member 128 attached to the holding body 100 and a portion adjacent to the prevention member 128 of the stepped portion 110 of the holding body 100, that is, a convex portion 114 are formed. When the upper portion 111 of the wall surface portion 112 is compared with the second height obtained by combining the thickness of the sliding member 124 wound around the upper portion 111 of the wall surface portion 112, as shown in FIG. The first height of 128 is set higher.

  As shown in FIGS. 2 and 5, the guide member 74 is disposed at both ends of the endless belt 72 and the pressure unit 76, and the pressure unit 76 is supported by the guide member 74.

  As shown in FIGS. 2 and 5, the frames 78 and 79 support the holding body 100, and both ends thereof are supported by the guide member 74 so that the holding body 100 is pressed toward the heating roll 66. Yes. At this time, the end portions of the frames 78 and 79 penetrate the guide member 74, and the end portions of the frames 78 and 79 are urged toward the heating roll 66 by an urging means such as a spring. At this time, a pressure lever is connected to the member that supports the pressure unit 76, and the pressure lever is urged by the urging means so that the pressure unit 76 presses the heating roll 66. (Not shown).

  Here, mainly with reference to FIGS. 2 and 3, the fixing of the toner image onto the recording medium by the fixing device 36 of the image forming apparatus 10 of the embodiment will be described. In fixing the toner image onto the recording medium 130 by the fixing device 36, first, the recording medium 130 onto which the toner image has been transferred by the image forming unit 14 passes through the conveyance path 32, and the heating roll 66 and the endless belt 72 are pressed. It is fed into the contact area 102 pressed by the pressing member 122 and the pressing portion 104 of the pressing unit 76. At this time, the heating roll 66 is driven to rotate, and the endless belt 72 also moves around the outer periphery of the pressurizing unit 76, whereby the recording medium 130 is fed into the contact area. The recording medium 130 that has been fed is sandwiched between the heating roll 66 and the endless belt 72, and is first pressed by the heating roll 66 and the pressure member 122, and then the heating roll 66 and the pressure portion. By being pressed by 104, the toner image is fixed on the recording medium 130.

  At this time, the pressing force that presses the heating roll 66 is pressed so that the pressing force of the pressing portion 104 becomes stronger than that of the pressing member 122. That is, the pressing of the recording medium 130 by the pressing member 122 and the pressing portion 104 is first performed by the pressing member 122 having a weak pressing force provided on the inlet side 68 of the recording medium 130 and then a strong pressing force. It is pressed by the pressure part 104. At this time, the pressure member 122 on the inlet side 68 and the pressure portion 104 on the outlet side 70 are pressed by the urging force of the urging means of the pressure portion 76, but the pressure member 122 is bent so as to be elastically deformable. Whereas the pressurization portion 104 is formed integrally with the holding body 100, it is difficult to be deformed. Therefore, the pressing force of the pressing member 122 on the inlet side 68 is pressed by a weak pressing force compared to the pressing portion 104 on the outlet side 70.

  Further, when the endless belt 72 rotates following the rotation of the heating roll 66, the endless belt 72 is smoothly rotated by the sliding member 124 provided between the holding body 100 and the endless belt 72. At this time, the endless belt 72 rotates in contact with the prevention member 128 provided on the holding body 100. Since the prevention member 128 is impregnated with the lubricant, the sliding member 124 and the endless belt 72 are rotated. In addition, the lubricant is held between the inner peripheral surface and the inner peripheral surface.

  In addition, as described above, the first height of the prevention member 128 attached to the holding body 100 and the portion adjacent to the prevention member 128 of the holding body 100, that is, the wall surface on which the convex portion 114 of the holding body 100 is formed. When the upper part 111 of the part 112 is compared with the second height in which the thickness of the sliding member 124 wound around the upper part 111 of the wall surface part 112 is compared, the height of the prevention member 128 is higher. (See FIG. 4). Therefore, the endless belt 72 rotates in a state where it floats on the concave portion 126 attached to the upper portion 111 of the wall surface portion 112 of the holding body 100 and the convex portion 114 of the sliding member 124. Therefore, deformation of the endless belt and the sliding member is prevented. Further, by increasing the first height of the prevention member 128, the sliding member 124 comes into contact with the endless belt 72 at a position away from the position where the convex portion 114 of the holding body 100 is formed. The pulling force by the endless belt 72 is not directly applied to the concave portion 126 of the sliding member 124 attached to the convex portion 114.

  Further, the prevention member 128 is provided so as to be in contact with the tip portions 116 of the plurality of convex portions 114 of the holding body 100, thereby preventing the prevention member 128 from being deformed by the rotation of the endless belt 72.

  In the embodiment, the case where the convex portion is formed on the holding body and the concave portion is formed on the sliding member has been described. However, the present invention is not limited thereto, and the concave portion is formed on the holding body and the convex portion is formed on the sliding member. May be.

DESCRIPTION OF SYMBOLS 10: Image forming apparatus 12: Image forming apparatus main body 14: Image forming means 16: Ejection part 18: Paper feeding unit 20: Paper feeding unit main body 22: Paper feeding cassette 24: Pickup roll 26: Retard roll 28: Feed roll 32: Transport path 34: Ejection port 36: Fixing device 38: Registration roll 40: Ejection roll 42: Transfer device 44: Image carrier 56: Charging device 58: Optical writing device 60: Developing device 62: Cleaning device 64: Process cartridge 66: Heating roll 68: Inlet side 70: Outlet side 72: Endless belt 74: Guide member 76: Pressure part 78, 79: Frame 84: Roll part 86: Heater 88: Core 90: Release layer 92: Peeling claw 94: Thermostat 96: Inlet chute 98: Outlet chute 100: Holding body 10 : Contact area 104: Pressurization part 106: Seat surface 108: Extension part 110: Step part 111: Upper part 112: Wall part 114: Convex part 116: Tip part 118: Bottom part 120: Prevention member arrangement part 122: Pressurization Member 124: Sliding member 126: Concave portion 128: Preventing member 130: Recording medium

Claims (6)

A rotating body,
An endless strip that contacts the rotating body and forms a contact area;
A heating source for heating the contact area;
A holding body for rotatably holding the endless strip inside the endless strip;
A sliding member provided between the endless strip and the holding body, on which the endless strip slides,
A convex portion is formed on one of the holding body and the sliding member, and a concave portion is formed on the other.
The convex part and the concave part fit together, and the sliding member is fixed to the holding body,
A fixing device having a preventing member for preventing the fitting of the convex portion and the concave portion from being released. The prevention member is impregnated with a lubricant,
The fixing device according to claim 1, wherein an inner surface side of the endless belt is in contact with the prevention member.   The fixing device according to claim 1, wherein the prevention member is in contact with a front end side of the convex portion.   A second height obtained by combining the first height of the prevention member in the radial direction of the endless belt, the portion of the holding body adjacent to the prevention member, and the thickness of the sliding member. The fixing device according to claim 1, wherein the first height of the prevention member is higher when the heights of the prevention members are compared.   The endless belt-like body is separated from a portion in which the convex portion of the holding body adjacent to the prevention member is formed and a thickness of the sliding member are combined. The fixing device described.   An image forming apparatus comprising the fixing device according to claim 1.

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