JP5617376B2 - Fixing apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus, and more particularly to a configuration of a fixing device built in the image forming apparatus.

  In an electrophotographic image forming apparatus, the surface of a photosensitive drum is charged almost uniformly, and then the photosensitive drum is exposed by a laser scanning unit or the like to form an electrostatic latent image corresponding to an image signal. Then, the toner charged by the developing device is supplied onto the photosensitive drum to be visualized, and the toner image is transferred to a recording member such as transfer paper. Since the toner image transferred to the recording member is only carried on the recording member and is not fixed, the toner image is heated and pressurized by a fixing device provided in the image forming apparatus, and the toner image is thermally melted. An image is fixed and fixed on the recording member.

  As a basic configuration of a conventional fixing device, a heating member with a built-in halogen lamp, a pressure member pressed against the heating member, and a thermistor for detecting the temperature of the heating member are provided in the housing. It consists of a configuration. According to this fixing device, the toner image passing through the nip portion formed by press-contacting the heating member and the pressure member is heated by the heat of the heating member heated by the radiant heat of the halogen lamp, and the heating member Is pressed by the pressure member and fixed to the recording member. The housing is formed with a carry-in port through which the recording member is carried in and a carry-out port through which the recording member is carried out, and the recording member carrying the toner image is carried into the housing from the carry-in port and fixed from the carry-out port. The finished recording member is carried out of the housing.

  On the other hand, conventionally, a method of preventing the diffusion of heat generated in the fixing device and improving the heat retaining effect has been adopted.

  For example, Patent Document 1 discloses a configuration in which a frame having a shape in which an air layer is likely to stay is provided in order to improve the heat retaining effect.

  Patent Document 2 also shows a configuration in which uneven portions are provided to inhibit natural convection.

  Patent Document 3 also discloses a configuration that suppresses air convection in the internal space of the frame.

JP 2004-177573 A JP 2004-109626 A JP 2001-166621 A

  However, in the above configuration, air convection can be suppressed, but heat insulation cannot be performed more efficiently.

  The present invention has been made to solve the above-described problems, and provides a fixing device and an image forming apparatus that can effectively suppress thermal energy released to the outside by thermal convection and thermal airflow. The purpose is to provide.

  In a fixing device for fixing a toner image to a recording member according to an aspect of the present invention, a heating member for heating the recording member, a pressurizing member that pressurizes by pressing the heating member, and the heating member and the pressurizing member are accommodated And a housing formed with a carry-in port for carrying in the recording member and a carry-out port through which the recording member is carried out, and a heat insulating portion provided for keeping the temperature of the housing attached to the carry-out port. Prepare. The housing includes first and second housing units provided so as to cover the heating member and the pressure member, respectively. The heat insulating part is provided to close the opening between the heating member and the casing at the carry-out port and the opening between the pressure member and the case at the carry-out port. A second closing member.

  Preferably, the first and second closing members are provided in the vicinity of an end portion on the downstream side in the transport direction of the recording member in the nip region formed by the heating member and the pressure member.

  Preferably, the first and second closing members correspond to elastic members that contact the heating member and the pressure member, respectively.

  In particular, the elastic member is molded from a material that allows the infrared radiation rate of the elastic member on the carry-out side to be 0.5 or less.

  Preferably, at least one of the first and second closing members corresponds to a rotating member that contacts a corresponding member of the heating member and the pressure member.

  Preferably, at least one of the first and second closing members corresponds to a rotating member provided to face a corresponding member of the heating member and the pressing member, and the rotating member is not a corresponding member. It rotates in the direction opposite to the rotation direction of the corresponding member while maintaining the contact state.

  In particular, the rotating member is molded with a low radiation layer having an infrared emissivity of 0.5 or less and a release layer provided on the outer peripheral side of the low radiation layer.

  Preferably, the apparatus further includes a discharge path member that forms a discharge path for discharging a surplus heat flow in the vicinity of the carry-in port between the outer periphery of at least one of the first and second casing units.

  Preferably, the heat insulating portion further includes a separation mechanism that sets at least a part of at least one of the first and second closing members from the closed state to the open state.

  In particular, the separation mechanism sets at least a part of the first and second closing members from the closed state to the open state when continuous printing is performed when the size of the recording member is small.

  An image forming apparatus according to an aspect of the present invention includes an image forming unit that forms a toner image, and the fixing device described above that fixes the formed toner image on a recording member.

  According to the above configuration, in the fixing device, the heat insulating portion provided to keep the temperature of the housing attached to the carry-out port is provided, and the heat insulating portion is provided between the heating member and the housing at the carry-out port. A first closing member provided to close the opening and a second closing member provided to close the opening between the pressurizing member and the housing at the carry-out port. It is possible to block the heat convection on the side and the casing and the pressure member side, and it is possible to effectively suppress the heat energy released to the outside by the heat convection and the heat flow.

1 is a diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 8 is a diagram illustrating thermal convection and thermal airflow in fixing device 110 according to the embodiment of the present invention. FIG. 3 is a perspective view of fixing device 110 according to the embodiment of the present invention. It is sectional drawing of the fixing device 112 according to the modification 1 of embodiment of this invention. It is sectional drawing of the fixing device 114 according to the modification 2 of embodiment of this invention. FIG. 10 is a cross-sectional view of a fixing device 116 according to a third modification of the embodiment of the present invention. It is a figure explaining the structure of a mylar film. It is a figure explaining composition of rotation member 34 grade. It is sectional drawing of the fixing device 118 according to the modification 6 of embodiment of this invention. It is a figure explaining the mechanism of the mylar film which contacts the heating roller 22 according to the modification 7 of this Embodiment. It is a figure explaining the flow which controls the drive part according to the modification 8 of this Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same.

(Embodiment)
FIG. 1 is a diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention.

  Referring to FIG. 1, image forming apparatus 100 according to the first embodiment of the present invention is provided with exterior cover 101 so as to cover the entire apparatus main body, and a recording member printed in the apparatus main body is a discharge port. It is carried out from 108.

  As the apparatus main body, in this example, a tandem type color printer that forms a color image is shown as an example.

  Specifically, for example, four photoreceptors 104 that rotate, and an intermediate transfer belt 105 that sequentially laminates and transfers toner images formed sequentially at respective transfer positions of the photoreceptor 104 for image formation. In addition, a transfer roller 106 provided at a transfer position set around the moving surface of the intermediate transfer belt 105 is shown. Then, the recording member stored in the paper feed cassette 102 is conveyed to the transfer position using the paper feed roller 103.

  The image forming apparatus 100 forms an electrostatic latent image on the photoreceptor 104 based on image data to be printed on a recording member. The electrostatic latent images formed on the photoconductor 104 are sequentially stacked on the intermediate transfer belt 105. The toner image that has been electrostatically transferred onto the intermediate transfer belt 105 and has been combined is electrostatically and collectively transferred onto the recording member by electrostatic suction from the transfer roller 106 at the transfer position. Then, heat and pressure are applied to the transferred transfer paper (recording member) through the fixing device 110 to fix the image. Image formation is completed by this process. Then, the recording member is discharged from the discharge port 108.

  In addition, a sheet detection sensor 107 that detects a recording member conveyed between the fixing device 110 and the transfer roller 106, and a sheet detection sensor 109 that detects a recording member conveyed between the fixing device 110 and the discharge port 108. And provide. The paper detection sensor 107 detects the passage of the leading end of the recording member that has passed the transfer roller 106. The paper detection sensor 109 detects the passage of the rear end of the recording member that has passed through the fixing device 110. In this example, the controller 10 is shown as a control unit that controls the entire image forming apparatus 100, and the controller 10 reads the application program stored in the memory 12 to realize a flow described later. .

  FIG. 2 is a diagram illustrating thermal convection and thermal airflow in fixing device 110 according to the embodiment of the present invention.

  Referring to FIG. 2, here, a case where a casing 28, a heating roller (heating member) 22, and a pressure roller (pressure member) 20 in the fixing device 110 are provided is shown. The casing 28 is provided with a carry-in port 26 for carrying in the recording member and a carry-out port 24 for carrying out the recording member.

  As shown here, ascending airflow accompanying heat and thermal convection accompanying rotation occur around the rotating heating roller 22 and pressure roller 20. Further, as the recording member is transported from the carry-in entrance 26, a hot air flow is generated in the unloading direction of the recording member. These are discharged out of the fixing device 110 from the carry-out port of the housing 28. This time, in order to fill the hot air flow, cold air outside the fixing device 110 flows in from the carry-in entrance 26, and heat energy is consumed.

  Therefore, in the embodiment of the present invention, a heat insulating portion (blocking mechanism) for keeping the temperature of the casing attached to the carry-out port of the casing 28 is provided.

FIG. 3 is a perspective view of fixing device 110 according to the embodiment of the present invention.
Referring to FIG. 3, fixing device 110 is substantially entirely covered with casing 28, and has outlet 24 on the upper side of casing 28 (downstream in the conveyance direction of the recording member). A carry-in entrance 26 is provided on the side (upstream in the conveyance direction of the recording member). The housing 28 is assumed to be molded by a housing unit 28P provided so as to cover the heating roller 22 and a housing unit 28Q provided so as to cover the pressure roller 20. The housing units 28P and 28Q may be molded as a single unit or may be molded separately. The same applies to the configurations of the following modifications and the like.

  The housing 28 is provided with a heating roller 22 incorporating a halogen lamp (not shown) and a pressure roller 20.

  The recording member carried in from the carry-in port 26 on the lower side of the housing 28 is heated and pressurized by the heating roller 22 and the pressure roller 20 to fix the toner image, and is carried out from the carry-out port 24.

In the embodiment of the present invention, a closing mechanism 45 attached to the carry-out port 24 is provided.
Specifically, the closing mechanism 45 dams the flow of heat convection using the Mylar films 30 and 32 that are sheet-like elastic members that are closing members.

  In this example, the mylar film 30 closes the opening between the housing unit 28 </ b> P and the heating roller 22. Specifically, one end side of the mylar film 30 is brought into contact with the casing 28, and the other end side is brought into contact with the heating roller 22. With this method, it is possible to block the heat convection on the heating roller side in the housing 28.

  Similarly, the opening between the housing unit 28 </ b> Q and the pressure roller 20 is closed by the mylar film 32. Specifically, one end side of the mylar film 32 is brought into contact with the casing 28, and the other end side is brought into contact with the pressure roller 20. By this method, it becomes possible to block the heat convection on the pressure roller side in the housing 28.

  In this example, the point where the mylar film 30 and the heating roller 22 are brought into contact is the vicinity of the end of the nip region formed by the heating roller 22 and the pressure roller 20 (downstream in the conveyance direction of the recording member). . As an example, the mylar film 30 is brought into contact with the roller circumferential distance of the heating roller 22 within 10 mm from the end of the nip region.

  Similarly, the mylar film 32 and the pressure roller 20 can be similarly provided.

  By contacting the mylar film in the vicinity of the end of the nip region, the region of the carry-out port 24 for carrying out the recording member can be made as narrow as possible by the mylar film. In other words, it is possible to enhance the heat retaining effect by narrowing the region that radiates heat from the heating roller 22 and the pressure roller 20 to the carry-out port 24.

  As a result, the temperature rise in the fixing device 110 can be further accelerated, so that there is an effect of shortening the warm-up time and slowing down the temperature drop of the heating roller, thereby achieving energy saving and running cost reduction by improving energy efficiency. Can do.

(Modification 1)
FIG. 4 is a cross-sectional view of fixing device 112 according to the first modification of the embodiment of the present invention.

  Referring to FIG. 4, fixing device 112 according to the first modification of the embodiment of the present invention is different from fixing device 110 described in FIG. 3 in that case unit 28P is changed to case unit 28A. The difference is that the mylar film 30 is changed to the rotating member 34. Since the other points are the same, detailed description thereof will not be repeated.

  In the first modification, a rotating member 34 is provided as a closing member instead of the mylar film 30.

  Specifically, the opening between the housing unit 28 </ b> A and the heating roller 22 is closed by the rotating member 34. Then, the rotating member 34 is rotated so as to be in the same direction as the heating roller 22.

  With this method, it is possible to block the heat convection on the heating roller side in the housing unit 28A. The rotating member 34 may be arranged as a driven roller of the heating roller 22.

  In this example, a rotating member 34 is provided instead of the mylar film 30. In the configuration of FIG. 3 described above, there is a possibility that dirt (paper dust, toner, etc.) on the surface of the heating roller 22 accumulates at the portion where the mylar film 30 and the heating roller 22 are in contact with each other. Although there is a possibility that the image is generated in the image, it is possible to prevent the occurrence of the fixed gloss streak in the image by suppressing the phenomenon that the rotating member 34 rotates and the contamination is accumulated in the portion.

(Modification 2)
FIG. 5 is a cross-sectional view of fixing device 114 according to the second modification of the embodiment of the present invention.

  Referring to FIG. 5, fixing device 114 according to the second modification of the embodiment of the present invention replaces housing units 28 </ b> P and Q with housing units 28 </ b> A and 28 </ b> B as compared with fixing device 110 described in FIG. 3. The point which replaced is the point which changed the mylar films 30 and 32 into the rotation members 34 and 36. Since the other points are the same, detailed description thereof will not be repeated.

  In the second modification, rotating members 34 and 36 are provided as blocking members instead of the mylar films 30 and 32.

  Specifically, the opening between the housing unit 28 </ b> A and the heating roller 22 is closed by the rotating member 34. Further, the opening between the housing unit 28 </ b> B and the pressure roller 20 is closed by the rotating member 36. The rotating members 34 and 36 are rotated so as to be in the same direction as the heating rollers 22 and 20, respectively.

In this method, the same effect as described above can be obtained.
(Modification 3)
FIG. 6 is a cross-sectional view of fixing device 116 according to the third modification of the embodiment of the present invention.

  Referring to FIG. 6, fixing device 116 according to the third modification of the embodiment of the present invention is different from fixing device 112 described in FIG. 3 in that case unit 28P is changed to case unit 28C. The arrangement differs from the point that the rotation member 34 is changed to the rotation member 38. Since the other points are the same, detailed description thereof will not be repeated.

  In the third modification, a case where the rotating member 38 is not brought into contact with the heating roller 22 will be described. It is assumed that a gap of 1 mm or less is generated between the rotating member 38 and the heating roller 22.

  The rotating member 38 is provided between the housing unit 28 </ b> C and the heating roller 22, and is in contact with the housing unit 28 </ b> C, but is not in contact with the heating roller 22.

  Further, the rotation direction of the rotation member 38 rotates in the direction that becomes the counter direction with the heating roller 22.

  The rotation direction of the rotation member 38 is the counter direction with the heating roller 22, and the air in the housing unit 28 </ b> C is discharged through a slight gap, but the air gap is slight, and the heating roller in the housing unit 28 </ b> C. Most of the thermal convection on the 22 side can be blocked.

  Further, in this configuration, the viscous flow of a part of the hot airflow that has passed through the nip region between the heating roller 22 and the pressure roller 20 is generated along the outer surface of the heating roller 22 according to the rotation direction of the heating roller 22. Flow in the direction.

  The viscous flow flowing along the outer periphery of the heating roller 22 and the discharged air flow accompanying the rotation of the rotating member 38 collide with each other in the gap portion.

  Therefore, it is possible to prevent the viscous flow from flowing into the housing unit 28C due to the collision in the gap portion. Further, it is possible to suppress the hot air flow on the heating roller 22 side in the housing unit of the housing unit 28C from flowing out from the external carry-out port.

  Further, in this configuration, since the rotating member 38 is not in contact with the heating roller 22, it is possible to suppress wear due to contact with the heating roller 22.

(Modification 4)
In the fourth modification of the present embodiment, a case will be described in which heat dissipation due to radiation of the blocking member is suppressed.

FIG. 7 is a diagram illustrating the configuration of the mylar film.
Referring to FIG. 7, the mylar film is assumed to be molded from a base material 701, a low radiation layer 702, and a protective layer 703 from the side in contact with the heating roller 22.

  The low radiation layer 702 is provided to prevent heat inside the fixing device from being radiated and radiated to the outside of the fixing device. The infrared radiation rate of the low radiation layer 702 is assumed to be 0.5 or less. An example is an aluminum layer.

The protective layer 703 preferably has a low infrared emissivity.
Further, it is desirable that the base material 701 has releasability because it contacts the heating roller 22. For example, a PFA layer or the like may be used.

  In this example, the case where the radiant heat 706 to the inside is larger than the radiant heat 704 to the outside is shown.

  With this configuration, it is possible to suppress heat dissipation due to radiation of the closing member and further suppress loss of heat energy.

(Modification 5)
In Modification 5 of the present embodiment, a case will be described in which heat dissipation due to radiation of the rotating member is suppressed.

FIG. 8 is a diagram illustrating the configuration of the rotating member 34 and the like.
Referring to FIG. 8, the rotating member is assumed to be molded with a base material 801, a low radiation layer 802, and a protective layer 803.

  The low radiation layer 802 is provided to prevent the heat inside the fixing device from being radiated and radiated to the outside of the fixing device. The infrared radiation rate of the low radiation layer 802 is 0.5 or less. An example is an aluminum layer.

  The protective layer 803 desirably has releasability. Further, the protective layer 803 preferably has a low infrared emissivity. Specifically, a PFA layer having a thickness of 30 μm or less can be used.

  With this configuration, it is possible to suppress heat dissipation due to radiation of the rotating member and further suppress loss of heat energy.

(Modification 6)
In the sixth modification of the present embodiment, a method for appropriately dealing with surplus heat flow will be described.

FIG. 9 is a cross-sectional view of fixing device 118 according to the sixth modification of the embodiment of the present invention.
Referring to FIG. 9, fixing device 118 according to the sixth modification of the embodiment of the present invention has housing unit 28 </ b> C outside of housing unit 28 </ b> C of fixing device 118 as compared with fixing device 116 of FIG. 6. A difference is that a path member 29 for forming a discharge path for discharging a surplus heat flow in the vicinity of the carry-in port is further provided between the outer periphery and the outer periphery. Since the other points are the same, detailed description thereof will not be repeated.

  The path member 29 forms a discharge path with the housing unit 28C. That is, the path member 29 forms a path through which excess heat flow near the carry-in entrance 26 is discharged.

  In this example, depending on the space volume in the casing unit 28C of the fixing device 118, the air in the casing unit 28C of the fixing device 118 expands before and after heating in the fixing device 118. Overflow from the fixing device 118 will occur.

  As described above, since the exit 24 side (the downstream side in the conveyance direction of the recording member) is blocked, the heated air overflows from the entrance 26 side, and is not expected to be part of the image forming apparatus. There is also the possibility of an impact. For example, a problem such as raising the temperature of the toner storage unit can be considered.

  Therefore, it is possible to realize an effective fixing device that does not affect an unexpected part of the image forming apparatus by forming a discharge path for guiding the overflowing heated air.

  Although the sixth modification has been described using the configuration of the third modification, the present invention can be similarly applied to other configurations. Moreover, although the case where one discharge path | route was provided was demonstrated, it can also be set as the structure which provides another discharge path | route in the opposing side.

(Modification 7)
In the seventh embodiment, a configuration corresponding to a temperature rise at the roller end of the fixing device will be described.

  FIG. 10 is a diagram illustrating the mechanism of the mylar film that comes into contact with the heating roller 22 according to the seventh modification of the present embodiment.

  With reference to FIG. 10 (A), here, the structure separated into three as a mylar film which contacts the heating roller 22 is shown. Specifically, a fixed mylar film 903 and movable mylar films 902 and 904 corresponding to both ends of the heating roller 22 sandwiching the fixed mylar film are shown.

  Mylar films 902 and 904 are movable. Specifically, it is assumed that the portion that supports the mylar film 902 is connected to the gear 906. The gear 906 is rotated in accordance with an instruction from the drive unit 908.

  With reference to FIG. 10B, here, a case where the gear 906 rotates in accordance with an instruction from the drive unit 908 is shown. Along with the rotation of the gear 906, the portion that supports the mylar film connected to the gear 906 rotates. And a mylar film moves upwards centering on a pivot part.

  With this configuration, the contact / non-contact of the mylar film 902 corresponding to the end of the heating roller 22 can be controlled.

  In this example, the movement of the mylar film 902 has been described, but the mylar film 904 is also movable as a similar configuration.

  FIG. 11 is a diagram illustrating a flow for controlling the drive unit according to the eighth modification of the present embodiment. In this example, the driving unit is driven according to an instruction from the controller 10. The flow shown below is executed by the controller 10 reading a program stored in the memory 12.

  Referring to FIG. 11, first, it is determined whether printing is started (started) (step S2). Specifically, it is determined whether a print job has been submitted. If printing has not started, step S2 is maintained.

  Next, when a print job is input, it is next determined whether or not the printing paper is of a small size (step S4). Specifically, the content of the print job is confirmed and it is determined whether or not the size of the designated printing paper (recording member) is a small size. For example, when B5 size, B6 size, etc. are designated, it may be determined that the size is small. If it is determined that the printing paper is not small, the process returns to step S2.

  If it is determined in step S4 that the size of the printing paper is small (YES in step S4), it is determined whether the number of printed sheets is M or more (step S6). Specifically, the contents of the print job are confirmed, and it is determined whether or not the instructed print number is M or more. For example, the number of M sheets may be 10 or more. When it is determined that the number of printed sheets is less than M, the process returns to step S2.

  If it is determined that the number of printed sheets is M or more (YES in step S6), the drive unit 908 is instructed (step S8). Specifically, an instruction is given so that the mylar film 902 is not in contact with the heating roller 22. In response to the instruction, the drive unit 908 rotates the gear 906 to move the mylar film 902 upward so that it does not contact the heating roller 22. The same applies to the Mylar film 904.

Next, it is determined whether printing has been completed (step S10).
If it is determined in step S10 that printing has been completed, the drive unit 908 is instructed (step S12). Specifically, the mylar film 902 is instructed to come into contact with the heating roller 22. The drive unit 908 rotates the gear 906 in response to the instruction to move the mylar film 902 downward to bring it into contact with the heating roller 22. The same applies to the Mylar film 904. And it returns to step S2 again.

  In the above flow, in a print job, in the case of continuous printing in which the print paper is a small size and the number of printed sheets is M or more, the drive unit 908 is instructed to move the mylar films 902 and 904 and the heating roller 22. The case where a non-contact state is set has been described. When the printing paper is of a small size, heat is not taken from the end of the heating roller 22, and therefore the temperature of the end of the heating roller 22 may rise compared to the center. In particular, in the case of continuous printing, there is a high possibility that the difference between the temperature at the end of the heating roller 22 and the temperature difference between the central portion through which the printing paper passes increases.

  Therefore, in the eighth modification of the present embodiment, in a print job, when the print paper is a small size and the number of prints is M or more, continuous printing is performed by instructing the drive unit 908 to load the mylar films 902 and 904. By being moved and brought into a non-contact state (open state) with the heating roller 22, it is possible to suppress the temperature rise at the end of the heating roller 22, thereby realizing an effective fixing device.

  In this example, the mylar film on the heating roller 22 side has been described. However, the present invention can be similarly applied to the mylar film on the pressure roller 20 side, and can be combined.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  20 pressure roller, 22 heating roller, 24 carry-out port, 26 carry-in port, 28, 28A to 28C housing, 29 path member, 34, 36, 38 rotating member, 110, 112, 114, 116, 118 fixing device, 906 Gear, 908 drive unit.

Claims (7)

In a fixing device for fixing a toner image on a recording member,
A heating member for heating the recording member;
A pressurizing member that pressurizes by pressing with the heating member;
A housing in which the heating member and the pressurizing member are housed, and a carry-in port for carrying in the recording member and a carry-out port for carrying out the recording member are formed;
A heat insulating part provided to keep the temperature of the housing attached to the carry-out port,
The housing includes first and second housing units provided so as to cover the heating member and the pressure member, respectively.
The heat insulating part is
A first closing member provided to close an opening between the heating member and the first housing unit at the carry-out port;
A second closing member provided to close an opening between the pressure member and the second casing unit at the carry-out port;
At least one of the first and second closing members corresponds to a rotating member that contacts a corresponding member of the heating member and the pressure member. In a fixing device for fixing a toner image on a recording member,
A heating member for heating the recording member;
A pressurizing member that pressurizes by pressing with the heating member;
A housing in which the heating member and the pressurizing member are housed, and a carry-in port for carrying in the recording member and a carry-out port for carrying out the recording member are formed;
A heat insulating part provided to keep the temperature of the housing attached to the carry-out port,
The housing includes first and second housing units provided so as to cover the heating member and the pressure member, respectively.
The heat insulating part is
A first closing member provided to close an opening between the heating member and the first housing unit at the carry-out port;
A second closing member provided to close an opening between the pressure member and the second casing unit at the carry-out port;
At least one of the first and second closing members corresponds to a rotating member provided to face a corresponding member of the heating member and the pressing member,
The fixing device, wherein the rotation member rotates in a direction opposite to a rotation direction of the corresponding member while maintaining a non-contact state with the corresponding member.   The fixing device according to claim 1, wherein the rotating member is molded with a low radiation layer having an infrared radiation rate of 0.5 or less and a release layer provided on an outer peripheral side of the low radiation layer.   4. The fixing according to claim 1, wherein the heat insulating portion further includes a separation mechanism that sets at least a part of at least one of the first and second closing members from a closed state to an open state. 5. apparatus.   The separation mechanism sets at least a part of the first and second closing members from a closed state to an open state when continuous printing is performed when the size of the recording member is a small size. Item 5. The fixing device according to Item 4. Further comprising a discharge path member forming a discharge path for discharging the excess heat flow in the vicinity of the entrance between the periphery of at least one casing unit before Symbol first and second housing units, claim The fixing device according to 1 or 2 . Image forming means for forming a toner image;
An image forming apparatus comprising: the fixing device according to claim 1, wherein the formed toner image is fixed to a recording member.

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