JP2013083867A - Image forming apparatus and fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device which is replaceable leaving a heating coil in a main body side and whose cost is reduced, and an image forming apparatus comprising the fixing device.SOLUTION: A fixing device includes: a fixing flame; an endless heating belt which moves in circulation and is inductively heated; a pressure roll which sandwiches a recording medium with the heating belt to apply pressure on the recording medium; a receiving member which sandwiches the heating belt with the pressure roller and is provided inside the heating belt to receive the pressure from the pressure roll; a fixing unit which is attached to a main body frame and detachable therefrom; a heating coil which inductively heats the heating belt in a state where the fixing unit is attached to the main body frame; and a main body side unit which is supported by the main body frame and maintains the supported state by the main body frame even when the fixing unit is removed from the main body frame.

Description

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

  There is known an image forming apparatus that forms a toner image on a recording medium and fixes the toner image on the recording medium by heating and pressurizing the toner image with a fixing apparatus. In this type of image forming apparatus, the fixing device has a relatively short life, and therefore, a configuration may be employed in which the fixing device is detachable and can be easily replaced when the life is reached.

  In Cited Document 1, an electromagnetic induction heating member and a pressure roller are attached to one fixing unit that can be pulled out of the main body, and the magnetic field generating means is attached to the main body. It shows the structure that remains in the main body even when pulled out from.

  In the cited document 2, the fixing device has a structure that has a rotating body that generates heat by electromagnetic induction and a magnetic field generating means, and can be used in combination with an electrical component such as a coil provided on the mounted device body side. It is shown.

  In the cited document 3, in the fixing device, a unit provided with an upper unit having a heating roller and a lower unit including a pressure roller is configured, and a heat insulating cover for closing a portion opened along the longitudinal direction of the heating roller of the upper unit. Alternatively, there is shown a structure in which the cleaning means or the release material applying means is detachable from the same location in the unit.

JP-A-11-135246 Japanese Patent Laid-Open No. 2005-190693 JP 2005-250371 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a fixing device that can be replaced while the heating coil is left on the main body side and that can reduce the cost, and an image forming apparatus including the fixing device.

Claim 1
Body frame,
A transport mechanism for transporting the recording medium;
A toner image forming unit that forms a toner image on the recording medium conveyed by the conveyance mechanism;
A fixing device that fixes the toner image to the recording medium by sandwiching and heating and pressing the recording medium that has been further conveyed by the conveying mechanism in response to the formation of the toner image;
The fixing device is
A fixing frame, an endless heating belt that receives induction heating while being circulated, a pressure roll that presses the recording medium with the recording medium conveyed by the conveyance mechanism interposed between the heating belt, and a pressure roll; A fixing unit that is disposed inside the heating belt with the heating belt interposed therebetween and receives pressure applied by the pressure roll, and is detachably attached to the main body frame, and the fixing unit is attached to the main body frame. It has a heating coil for induction heating the heating belt in the mounted state, and includes a body side unit that is supported by the body frame and maintains the state supported by the body frame even when the fixing unit is detached from the body frame,
The fixing unit extends along a region of the heating belt facing the main unit, covers the heating belt, and the cover is interposed between the heating belt and the main unit while the fixing unit is attached to the main unit frame. An image forming apparatus including a member.

  According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the cover member has a rib extending in the vertical direction so as to stand on the surface facing the heating coil side, and between the cover member and the main body side unit. An air flow path is formed.

  According to a third aspect of the present invention, in the image forming apparatus of the first or second aspect, the cover member has a support portion rotatably supported by the fixing frame at an upper portion of the cover member, and the heating belt is covered with the cover member. It is a member that is rotatable between a closed state and an open state in which the cover member is separated from the heating belt.

  According to a fourth aspect of the present invention, in the image forming apparatus according to any one of the first to third aspects, the fixing unit is in contact with the main body side unit in a state where the fixing unit is mounted on the main body frame. It has the positioning part which regulates.

Claim 5
A fixing frame, an endless heating belt that receives induction heating while being circulated, a pressure roll that presses the recording medium with the recording medium on which the toner image is formed being sandwiched between the heating belt, A fixing unit that is disposed inside the heating belt with the heating belt sandwiched between the pressure roll and receives the pressure applied by the pressure roll, and is detachably attached to the main body frame; and the main body frame. A body side unit having a heating coil for inductively heating the heating belt in a state where the fixing unit is mounted and supported by the main body frame and maintaining the state supported by the main body frame even when the fixing unit is detached from the main body frame. Prepared,
The fixing unit extends along a region of the heating belt facing the main unit, covers the heating belt, and the cover is interposed between the heating belt and the main unit while the fixing unit is attached to the main unit frame. A fixing device including a member.

  According to the image forming apparatus of the first aspect and the fixing apparatus of the fifth aspect, it is possible to replace the heating coil while leaving the heating coil on the main body side, and to reduce the cost.

  According to the image forming apparatus of the second aspect, the heat generated by the heating belt is less likely to be transferred to the main body unit side as compared with the case where this configuration is not provided.

  According to the image forming apparatus of the third aspect, it is possible to easily remove the recording medium when the recording medium being conveyed is picked up as compared with the case where the fixed cover member is provided.

  According to the image forming apparatus of the fourth aspect, the relative position of the heating coil and the heating belt is stabilized as compared with the case where this configuration is not provided, and a controlled amount of energy is always supplied from the heating coil to the heating belt. Can do.

1 is a schematic configuration diagram of a copying machine as an example of an image forming apparatus. FIG. 2 is a schematic configuration diagram of a fixing device built in the copying machine shown in FIG. 1. FIG. 3 is a schematic configuration diagram of a fixing unit constituting the fixing device shown in FIG. 2. FIG. 3 is a schematic configuration diagram of a main unit constituting the fixing device shown in FIG. 2. It is the figure which showed the shape of the cover member. It is the figure which showed the shape of the main body unit.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic configuration diagram of a copying machine as an example of an image forming apparatus.

  The copier 100 includes a scanner 101 and a printer 102. The scanner 101 is an apparatus that reads an image from a document and generates image data. The scanner 101 is not different from the conventional scanner, and detailed description thereof is omitted.

  Image data generated by the scanner 101 is input to the control unit 10 of the printer 102. In the control unit 10, image data input from the scanner 101 is converted into image data for exposure light modulation in an exposure unit 26 described later.

  The printer 102 has a main body frame 90, and members constituting the printer 102 are supported by the main body frame 90. On the upper part of the printer 102, a paper discharge tray 11 is provided on which the paper after the image is formed is discharged. A sheet feed stand 12 is disposed below the printer 102. The paper feed tray 12 accommodates sheets P before image formation in a stacked state. The paper feed tray 12 is configured to be freely drawn out for replenishing the paper P.

  The paper P is fed from the paper feed tray 12 by the pickup roll 13 and separated one by one by the separation roll 14, and the single paper P is moved upward in the direction of arrow A on the transport path 151 by the transport roll 15. Then, the waiting roll 16 adjusts the timing of the subsequent conveyance, and further conveys it upward. The conveyance of the sheet after the standby roll 16 will be described later.

  Four image forming engines 20Y, 20M, 20C, and 20K are arranged substantially at the center of the printer 102 in the vertical direction. These image forming engines 20Y, 20M, 20C, and 20K are apparatuses that form toner images using Y (yellow), M (magenta), C (cyan), and K (black) toners, respectively. It is. Since these four image forming engines 20Y, 20M, 20C, and 20K all have the same configuration, the image forming engine 20Y will be described here as an overview.

  The image forming engine 20Y includes a photoconductor 21Y that rotates in the direction indicated by an arrow B in FIG. 1, and a charger 22Y, a developing device 23Y, and a cleaner 24Y are disposed around the photoconductor 21Y. A transfer device 25Y is placed at a position where an intermediate transfer belt 31 described later is sandwiched between the photoreceptor 21Y.

  An exposure unit 26 is disposed below the four image forming engines 20Y, 20M, 20C, and 20K. Image data for exposure light modulation in the exposure unit 26 generated by the control unit 10 is input to the exposure unit 26. The exposure device 26 emits exposure light 261Y, 261M, 261C, and 261K corresponding to each of the image forming engines 20Y, 20M, 20C, and 20K, which is a light beam modulated based on the input image data. The The photosensitive members 21Y, 21M, 21C, and 21K constituting the image forming engines 20Y, 20M, 20C, and 20K are irradiated with the exposure lights 261Y, 261M, 261C, and 261K.

  Here, the photoreceptor 21 </ b> Y has a drum shape, holds charges by charging, discharges the charges by exposure, and holds an electrostatic latent image on the surface thereof.

  The charger 22Y charges the surface of the photoreceptor 21Y to a certain charging potential.

  Further, the exposure device 26 emits exposure light 261Y modulated according to the input image data. After being charged by the charger 22Y, the photoreceptor 21Y is irradiated with the exposure light 261Y from the exposure device 26, and an electrostatic latent image is formed on the surface of the photoreceptor.

  The photoreceptor 21Y is irradiated with exposure light 261Y to form an electrostatic latent image on the surface thereof, and then developed by the developing unit 23Y. A toner image (yellow in this image forming engine 20Y is formed on the surface of the photoreceptor 21Y). (Y) toner image) is formed.

  An intermediate transfer belt 31 is provided on the four image forming engines 20Y, 20M, 20C, and 20K.

  The toner image formed on the photoreceptor 21Y by development by the developing unit 23Y is transferred onto the intermediate transfer belt 31 by the action of the transfer unit 25Y.

  The toner remaining on the photoreceptor 21Y after this transfer is removed from the photoreceptor 21Y by the cleaner 24Y.

  The intermediate transfer belt 31 is an endless belt that is looped around a plurality of rolls 32 and circulates in the direction of arrow C.

  The toner images of the respective color toners formed by the image forming engines 20Y, 20M, 20C, and 20K are sequentially transferred onto the intermediate transfer belt 31 so as to overlap each other and are transferred to the secondary transfer position where the secondary transfer device 41 is disposed. Be transported. In synchronization with this, the sheet that has been transported to the standby roll 16 is transported to the secondary transfer position, and the toner image on the intermediate transfer belt 31 is transported by the action of the secondary transfer unit 41. Transcribed above. The sheet that has received the transfer of the toner image is further conveyed, the toner image on the sheet is fixed on the sheet by pressurization and heating by the fixing device 50, and an image composed of the fixed toner image is formed on the sheet. Is done. The paper on which the image is formed is further conveyed and discharged onto the paper discharge tray 11.

  The intermediate transfer belt 31 after the toner image is transferred onto the paper by the secondary transfer device 41 further circulates, and the toner remaining on the surface is removed from the intermediate transfer belt 31 by the cleaner 42.

  Further, toner containers 43Y, 43M, 43C, and 43K that store toners of the respective colors are mounted above the intermediate transfer belt 31. The color toners stored in the toner containers 43Y, 43M, 43C, and 43K are consumed by the developing devices such as the developing device 23Y, which are respectively provided in the corresponding image forming engines 20Y, 20M, 20C, and 20K. Each developer is replenished accordingly.

  The control unit 10 controls the entire printer 102 in addition to converting image data input from the scanner 101 for exposure.

  Further, two doors 91 and 92 that can be opened and closed are provided on the left side surface of the printer 102 in FIG. These doors 91 and 92 are provided for removing the prepared paper when the paper P being conveyed is picked up in the middle of the door. The upper door 91 of the two doors 91 and 92 is also opened and closed when the fixing unit 51 (see FIGS. 2 and 3) of the fixing device 50 is attached and detached. Details of the fixing device 50 will be described later. Further, a fan 61 for discharging the heat generated in the fixing device 50 to the outside is disposed above the fixing device 50. Correspondingly, the fan 61 on the side surface of the main body claim 90 corresponds to the fan 61. An exhaust port 93 is formed in the part.

  FIG. 2 is a schematic configuration diagram of the fixing device built in the printer 102 shown in FIG.

  3 is a schematic configuration diagram of a fixing unit constituting the fixing device shown in FIG. 2, and FIG. 4 is a schematic configuration diagram of a main body unit constituting the fixing device shown in FIG.

  The fixing device 50 includes a fixing unit 51 and a main unit 52. The fixing unit 51 is detachably mounted in the printer 102. That is, the fixing unit 51 is mounted on a mounting base 94 integral with the main body frame 90 (see FIG. 1) by opening the door 91 shown in FIG. 1 and sliding from the left side to the right side in FIG. It is fixed by 71.

  On the other hand, the main body unit 52 is supported by a subframe 95 that is integral with the main body frame 90 (see FIG. 1). The main unit 52 remains supported by the subframe 95 even when the fixing unit 51 is removed from the mounting base 94.

  The fixing unit 51 has a fixing frame 511, and each member constituting the fixing unit 51 is assembled to the fixing frame 511. The fixing unit 51 includes a heating belt 512, a pressure roll 513, and a receiving member 514. The main unit 52 has a heating coil 521 for inductively heating the heating belt 512. The heating belt 512 is an endless belt that receives induction heating by electromagnetic induction from the heating coil 521 of the main unit 52 while circulating and moving in the direction indicated by the arrow D. Further, the pressure roll 513 is conveyed along a conveyance path 151 (see FIG. 1), and a sheet on which a toner image is placed by the action of the secondary transfer unit 41 is sandwiched between the heating belt 512 and an arrow. A roll that rotates in the direction indicated by E to pressurize and convey the paper. The receiving member 514 is a member that is disposed inside the heating belt 512 with the heating belt 512 sandwiched between the pressure roll 513 and receives the pressure applied by the pressure roll 513. The sheet is guided by the chute 515 and proceeds on the conveyance path 152 in the direction indicated by the arrow F. The sheet is further sandwiched between the heating belt 512 and the pressure roll 513 so as not to be carried around while being attached to the heating belt 512. It is peeled from the heating belt 512 by 516 and proceeds in the direction indicated by the arrow G. Thereafter, the paper is discharged onto a paper discharge tray 11 shown in FIG.

  Further, the fixing unit 51 is provided with a cover member 517. The cover member 517 extends along the region of the heating belt 512 that faces the main unit 52 and covers the heating belt 512. The cover member 517 prevents the heating belt 512 from being damaged when the fixing unit 51 is attached and detached, and avoids the risk of the operator being burned when the heated heating belt 512 touches the operator's hand. The upper end portion 517a of the cover member 517 is rotatably supported by the fixing frame 511. The cover member 517 has a drooping posture as shown in FIGS. 2 and 3 due to its own weight. Yes. The cover member 517 is a resin molded member and is made of a material that transmits electromagnetic force as it is. The heating coil 521 of the main unit 52 induction heats the heating belt 512 while sandwiching the cover member 517. . Further, the cover member 517 has a rib 517d that stands upright on the outer surface 517c facing the main unit 51 and extends in the vertical direction.

  Between the outer surface 517c of the cover member 517 facing the main unit 52 and the surface 522 of the main unit 52 facing the cover member 517, air flows in the direction from the arrow H to the arrow I. An air flow path 53 is formed. The air that has passed through the air flow path 53 is heated while passing through the air passage 53 and is exhausted from the exhaust port 93 by the fan 61 shown in FIG.

  By forming the air flow path 53 here, the main unit 52 is suppressed from being warmed by the heat of the heating belt 512. When the temperature rise of the main unit 52 is suppressed, a material having low heat resistance can be used as the heating coil 521 of the main unit 52, which contributes to cost reduction and longer life. Moreover, the temperature rise of the cover member 517 is also suppressed by the air flowing here. The fixing unit 51 is temporarily taken out when the paper that has passed between the heating belt 512 and the pressure roll 513 is not peeled off by the peeling member 516 and is jammed along with the heating belt 51, and the cover unit 51 The paper 517 is opened around the upper end 517a to remove the jammed paper. At this time, the operator's hand touches the cover member 517. When air flows through the air flow path 53 and the temperature rise of the cover member 517 is suppressed, heat is not easily transmitted to the operator and it is safe.

  FIG. 5 is a diagram showing the shape of the cover member. FIG. 5A is a front view when the cover member is viewed from the main unit 52 side, and FIG. 5B is a side view.

  The cover member 517 is formed with an upper end portion 517a protruding upward on both the left and right sides in FIG. 5A, and the upper end portion 517a is provided with a hole 517e for supporting the fixing frame 511. In addition, ribs 517d are erected at equal intervals on an outer surface 517c of the cover member 517 facing the main unit 52 (see FIGS. 2 and 4). These ribs 517d extend in the vertical direction along the air flow path 53 (see FIG. 2) formed between the outer surface 517c and the main unit 52 (see FIGS. 2 and 4). The air flow in the air flow path 53 (see FIG. 2) between the main body unit 52 is assisted. Further, by providing this rib 517d, when the fixing unit 51 is taken out, the operator's hand touches the rib 517d, and also in this respect, the heat transmitted to the operator's hand is reduced.

  Returning to FIG. 2 and FIG. 3, the description will be continued.

  In the fixing unit 51, two fitting grooves 518a and 518b are formed in the fixing frame 511. The fitting pins 523a and 523b of the main unit 52 are fitted in the fitting grooves 518a and 518b, respectively. When the fixing unit 51 is mounted in the printer, the fixing pins 51 are positioned with respect to the main body unit 52 by fitting the fitting pins 523a and 523b of the main body unit 52 into the fitting grooves 518a and 518b. The The fixing unit 51 is fixed on a mounting base 94 which forms a part of the main body frame 90 (see FIG. 1) by a fixing screw 71 in a state where the fitting pins 523a and 523b are fitted in the fitting grooves 518a and 518b. The These fitting grooves 518a and 518b formed in the fixing frame 511 correspond to an example of the positioning portion according to the present invention.

  Here, the upper fitting groove 518a of the upper and lower fitting grooves 518a and 518b is formed to have the same width as the diameter of the fitting pin 523a, and the fitting pin 523a is fitted into the fitting groove 518a. Accordingly, the fixing unit 51 and the main unit 52 are positioned in the vertical direction. Further, the width of the upper fitting groove 518a in the direction perpendicular to the paper surface of FIG. 2 is also the same as the length of the fitting pin 523a in the same direction, and the fitting pin 523a is fitted into the fitting groove 518a. As a result, the fixing unit 51 and the main unit 52 are also positioned in the depth direction (direction perpendicular to the paper surface of FIG. 2). On the other hand, the lower fitting groove 518b has a dimension with a margin with respect to the fitting pin 523b. The lower fitting groove 518b serves as a rotation stopper for the main unit 52 by the surface against which the fitting pin 523b abuts.

  FIG. 6 is a diagram showing the shape of the main unit. 6A is a plan view of the main unit 52 viewed from the fixing unit 51 side, and FIG. 6B is a side view.

  A surface 522 of the main body unit 52 facing the fixing unit 51 is formed in an arc shape along the outer surface 517c of the cover member 517 of the fixing unit 51, and on both sides thereof, the surface 522 stands in an arc shape from the surface 522. A provided abutting rib 524 is provided. The abutment ribs 524 are close to both sides of the cover member 517 when the fixing unit 51 is mounted. A region sandwiched between the left and right abutment ribs 524 on the surface 522 facing the fixing unit 51 side is a region where an air flow path 53 (see FIG. 1) is formed between the surface 522 and the cover member 517.

  The fitting pins 523a and 523b extend to the left and right as shown in FIG. 6A, and correspondingly, fitting grooves 518a and 518b (see, for example, FIG. 2) formed in the fixing frame 511. Are also provided at positions corresponding to the respective fitting pins 523a and 523b.

  As described above, the upper fitting pin 523 a is fitted into the fitting groove 518 a and is pressed from the vertical direction, and contributes to the vertical positioning between the fixing unit 51 and the main body unit 52. The fitting groove 518a has a size that interferes with the tip 523a 'of the fitting pin 523a. When the fitting pin 523a is fitted into the fitting groove 518a, the fitting groove 518a The position of the tip 523a ′ is regulated, thereby contributing to the positioning in the depth direction of FIG. 6A (direction perpendicular to the paper surface of FIG. 2) between the fixing unit 51 and the main unit 52. On the other hand, the fitting groove 518b corresponding to the lower fitting pin 523b has a margin with respect to the lower fitting pin 523b, and the fitting pin 523b abuts against the fitting groove 518b. The unit 52 is prevented from rotating.

  The main unit 52 has a mounting portion 525 that protrudes to the left and right in FIG. The attachment portion 525 is provided with a boss 525a, and a hole 525b through which a screw passes is formed at the center of the boss 525a.

  As shown in FIG. 4, the main unit 52 includes a fixing frame 72 and a spring 73 sandwiched between the main unit 52 and a sub frame 95 that forms a part of the main body frame 90 (see FIG. 1). 95 is attached.

  The reason why the spring 73 is arranged here without directly fixing the main unit 52 to the subframe 95 is to absorb a dimensional error or the like when the fixing unit 51 is mounted and coupled to the main unit 52.

  According to the above embodiment, the fixing unit 51 can be provided at a low cost by providing the heating coil 521 with little deterioration on the main body side, and the running cost can be reduced. Further, by heating the heating belt 512 while always covering it with the cover member 517, it is difficult for the heat of the heating belt 512 to be transmitted to the heating coil 521, and the heating coil 521 can be made of a material having low heat resistance. The manufacturing cost can also be reduced.

  Here, an example in which the present invention is applied to the copying machine 100 shown in FIG. 1 has been described. However, the present invention is not applicable only to a copying machine, and requires a fixing device such as a printer or a facsimile machine. The present invention can be applied to various forms of image forming apparatuses.

DESCRIPTION OF SYMBOLS 10 Control part 26 Exposure device 90 Main body frame 20Y, 20M, 20C, 20K Image formation engine 21Y, 21M, 21C, 21K Photoconductor 31 Intermediate transfer belt 41 Secondary transfer device 50 Fixing device 51 Fixing unit 52 Main unit 53 Air flow path 61 Fan 71, 72 Fixing screw 73 Spring 90 Main body frame 91, 92 Door 93 Exhaust port 94 Mounting base 95 Subframe 100 Copy machine 102 Printer 511 Fixing frame 512 Heating belt 513 Pressure roll 514 Receiving member 515 Chute 516 Peeling member 517 Cover Member 517a Upper end 517b Lower end 517c Outer surface 517d Rib 517e, 525b Hole 518 Stopper 518a, 518b Fitting groove 521 Heating coil 523a, 523b Fitting pin 524 Abutting rib 525 Mounting portion 525a Boss

Claims (5)

Body frame,
A transport mechanism for transporting the recording medium;
A toner image forming unit for forming a toner image on the recording medium conveyed by the conveyance mechanism;
A fixing device that fixes the toner image to the recording medium by sandwiching and heating and pressing the recording medium that has been further conveyed by the conveying mechanism in response to the formation of the toner image;
The fixing device;
A fixing frame, an endless heating belt that receives induction heating while being circulated, a pressure roll that presses the recording medium with the recording medium conveyed by the conveying mechanism interposed between the heating belt, A fixing unit that is disposed inside the heating belt with the pressure belt interposed between the pressure belt and a receiving member that receives pressure applied by the pressure roller, and is detachably attached to the main body frame And a heating coil for inductively heating the heating belt in a state where the fixing unit is mounted on the main body frame, and the main body frame is supported by the main body frame even if the fixing unit is detached from the main body frame. The main body side unit that maintains the state supported by
The fixing unit extends along a region of the heating belt facing the main body side unit so as to cover the heating belt, and the heating belt and the main body side unit are attached to the main body frame. An image forming apparatus comprising a cover member interposed therebetween.   The cover member has a rib extending in a vertical direction standing on a surface facing the heating coil, and an air flow path is formed between the cover member and the main unit. The image forming apparatus according to claim 1.   The cover member has a support portion rotatably supported by the fixing frame at an upper portion of the cover member, and the cover member is in a closed state in which the heating belt is covered with the cover member, and the cover member is separated from the heating belt. The image forming apparatus according to claim 1, wherein the image forming apparatus is a member that is rotatable between the open state and the open state.   4. The fixing unit according to claim 1, further comprising a positioning portion that contacts the main body side unit and regulates a relative position between the fixing unit and the main body side unit when the fixing unit is attached to the main body frame. The image forming apparatus according to claim 1. A fixing frame, an endless heating belt that receives induction heating while being circulated, and a pressure roll that presses the recording medium with the recording medium on which the toner image is formed being sandwiched between the heating belt and A fixing member that is disposed inside the heating belt with the heating belt sandwiched between the pressure roll and receives a pressure applied by the pressure roll, and is detachably attached to the main body frame. A heating coil for inductively heating the heating belt in a state where the fixing unit is mounted on the main body frame, and the main body is supported by the main body frame even if the fixing unit is detached from the main body frame. It has a main unit that maintains the state supported by the frame,
The fixing unit extends along a region of the heating belt facing the main body side unit so as to cover the heating belt, and the heating belt and the main body side unit are attached to the main body frame. A fixing device comprising a cover member interposed therebetween.

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