JP2015146024A - Fixing apparatus and image forming apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing apparatus configured to arrange a separation member for separating a recording medium after fixing processing from a surface of a heating member, in a fixed position not in contact with the surface of the heating member, with a simple configuration, and an image forming apparatus including the same.SOLUTION: A fixing apparatus includes: a separation member 51 supported in a rockable manner to separate a sheet after fixing processing from a surface of a fixing belt 26; a first magnet 66 which is arranged in the separation member 51 to generate magnetic force toward th fixing belt 26; a second magnet 67 which is included in the fixing belt 26, has the same polarity as the first magnet 66, and faces the first magnet 66; and a spring member 62 which biases the separation member 51 toward the fixing belt 26. In the separation member 51, a tip 51b of the separation member 51 is arranged not in contact with the surface of the fixing belt 26 when a repulsive magnetic force formed by the first and second magnets 66, 67 is in balance with a biasing force of the spring member 62.

Description

The present invention relates to a fixing device used in an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multifunction machine thereof, and an image forming apparatus including the fixing device, and more particularly, to heat a recording medium after fixing processing without contact with a heating member. The present invention relates to a fixing device separated from a member and an image forming apparatus including the same.

In a fixing device used in an image forming apparatus, a recording medium carrying an unfixed toner image is fed into a nip portion between a heating member and a pressure member, and the toner on the recording medium is melted by the heating action of the heating member. At the same time, the toner image is fixed on the recording medium by applying a pressure action from the pressure member to the melted toner image. In order to prevent the recording medium on which the toner image is fixed from being wound around the heating member, a separation member including a separation claw or the like is provided.

When the separation member is pressed against the surface of the heating member, the surface of the heating member is damaged by the separation member. In order to prevent this problem, there is a type in which the separation member is disposed in a non-contact manner with respect to the surface of the heating member and the recording medium is separated from the surface of the heating member.

For example, the fixing device described in Patent Document 1 is provided with a separation member control unit for maintaining a constant distance between the surface of the fixing belt, which is a heating member, and the separation member. The separation member control unit includes a drive motor that drives the separation member, a laser measuring device that detects a distance between the surface of the fixing belt and the separation member, and the separation member on the surface of the fixing belt based on information from the laser measuring device. And a control circuit that swings relative to the control circuit. The separation member is swung by the drive motor, so that the distance between the surface of the fixing belt and the separation member is kept constant.

JP 2008-197535 A (paragraphs [0024], [0025], FIG. 1)

However, the fixing device described in Patent Document 1 described above has a problem that a laser measuring instrument and a motor are provided in order to keep the surface of the fixing belt and the separation member at a predetermined distance, and the apparatus becomes complicated and expensive. there were.

The present invention has been made to solve the above-described problems, and a separation member for separating the recording medium after the fixing process from the surface of the heating member is formed on the surface of the heating member with a simple configuration. Another object of the present invention is to provide a fixing device that can be disposed at a fixed position that is non-contact and an image forming apparatus including the same.

In order to achieve the above object, a first invention provides a recording medium carrying an unfixed toner image at a nip formed by a heating member heated by a heating means and a pressure member pressed against the heating member. In a fixing device that melts and fixes an unfixed toner image on a recording medium,
A separation member that is swingably supported on the downstream side of the nip portion with respect to the conveyance direction of the recording medium and that separates the recording medium after the fixing process from the surface of the heating member, and is provided at a rocking end of the separation member. A first magnet having a first magnetic pole opposed to the heating member, and a second magnet contained in the heating member and opposed to the first magnetic pole and having a second magnetic pole having the same polarity as the first magnetic pole And an elastic member that urges the separating member in a direction approaching the heating member, and the separating member has a repulsive magnetic force acting between the first and second magnets and an urging force of the elastic member. And is arranged at a position away from the surface of the heating member by a predetermined distance.

According to a second aspect of the present invention, in the above fixing device, an endless fixing belt as the heating member and a pressure that is disposed on an inner peripheral surface of the fixing belt and presses the fixing belt toward the pressure member. A guide portion that is disposed on an inner peripheral surface of the fixing belt and rotatably guides the fixing belt, and includes the second magnet and stretches the fixing belt together with the pressing portion and the guide portion. And a sleeve.

  According to a third aspect of the invention, there is provided an image forming apparatus including the fixing device having the above-described configuration.

According to the first invention, the urging force of the elastic member acts in the direction in which the separation member is brought closer to the heating member, while the repulsive magnetic force by the first magnet and the second magnet is in the direction in which the separation member is separated from the heating member. Works. By balancing the repulsive magnetic force generated by the first and second magnets and the biasing force of the elastic member, the separation member is disposed at a position away from the surface of the heating member by a predetermined distance. Accordingly, the separation member is not in contact with the surface of the heating member with a simple configuration in which the first and second magnets are provided and the repulsive magnetic force of the first and second magnets and the biasing force of the elastic member are balanced. Placed in
The recording medium after the fixing process can be separated from the surface of the heating belt.

1 is a diagram illustrating a schematic configuration of an image forming apparatus including a fixing device according to a first embodiment of the present invention. 1 is a side sectional view showing a fixing device according to a first embodiment. Side surface sectional drawing which shows schematically the structure of the separation member which concerns on 1st Embodiment, and its holding mechanism The side view which shows roughly the fixing device provided with the separation member based on 2nd Embodiment

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. Further, the use of the invention and the terms shown here are not limited thereto.

(First embodiment)
FIG. 1 is a diagram illustrating a schematic configuration of an image forming apparatus including a fixing device according to an embodiment of the present invention. The image forming apparatus 1 is provided with a sheet feeding unit 2 disposed in a lower portion thereof, a sheet conveying unit 3 disposed on a side of the sheet feeding unit 2, and an upper side of the sheet conveying unit 3. The image forming unit 4 includes a fixing device 5 disposed on the discharge side of the image forming unit 4, and an image reading unit 6 disposed above the image forming unit 4 and the fixing device 5.

The paper feed unit 2 includes a plurality of paper feed cassettes 7 that store paper 9 that is a recording medium. The paper 9 is sent to the paper transport unit 3 one by one.

The paper 9 sent to the paper transport unit 3 is transported toward the image forming unit 4 via the paper transport path 10. The image forming unit 4 forms a toner image on a sheet 9 by an electrophotographic process. The image forming unit 4 is a photoconductor 11 supported so as to be rotatable in the direction of an arrow in FIG. A charging unit 12, an exposure unit 13, a developing unit 14, a transfer unit 15, a cleaning unit 16, and a charge eliminating unit 17 are provided.

The charging unit 12 includes a charging wire to which a high voltage is applied. When a predetermined potential is applied to the surface of the photoconductor 11 by corona discharge from the charging wire, the surface of the photoconductor 11 is uniformly charged. When light based on the image data of the original read by the image reading unit 6 is irradiated onto the surface of the photoconductor 11 by the exposure unit 13, the potential on the surface of the photoconductor 11 is selectively attenuated, and the surface of the photoconductor 11 An electrostatic latent image is formed.

Next, the developing unit 14 develops the electrostatic latent image on the surface of the photoconductor 11, and a toner image is formed on the surface of the photoconductor 11. This toner image is transferred by the transfer unit 15 to the sheet 9 supplied between the photoconductor 11 and the transfer unit 15.

The sheet 9 on which the toner image has been transferred is conveyed toward the fixing device 5 disposed downstream of the image forming unit 4 in the sheet conveying direction. In the fixing device 5, the paper 9 is heated and pressed, and the toner image is melted and fixed on the paper 9. Next, the sheet 9 on which the toner image is fixed is discharged onto the discharge tray 21 by the discharge roller pair 20.

After the transfer of the toner image onto the paper 9 by the transfer unit 15, the toner remaining on the surface of the photoconductor 11 is removed by the cleaning unit 16, and the residual charge on the surface of the photoconductor 11 is removed by the charge eliminating unit 17. Then, the photosensitive member 11 is charged again by the charging unit 12, and image formation is performed in the same manner.

The fixing device 5 is configured as shown in FIG. FIG. 2 is a side sectional view schematically showing the fixing device.

The fixing device 5 is a fixing method using a heat source of an electromagnetic induction heating method, and includes a fixing belt 26 that is a heating member, a pressure roller 19 that is a pressure member, and an induction heating unit 30 that heats the fixing belt 26. The thermistor 25, which is a temperature detection unit, a belt holding member 55, and a sleeve 64
And a separating member 51 that separates the sheet 9 after the fixing process from the fixing belt 26. The pressure roller 19 and the sleeve 64 are rotatably supported in the longitudinal direction of the housing (not shown) of the fixing device 5, the induction heating unit 30 and the belt holding member 55 are fixedly supported by the housing, and the separation member 51 is a housing. Is swingably supported.

The fixing belt 26 is an endless heat-resistant belt, and in order from the inner peripheral side, an induction heating layer 26a made of electroformed nickel, an elastic layer 26b made of silicone rubber, etc., and made of fluororesin etc. A release layer 26c that improves the releasability when the fused toner image is melt-fixed;
Are stacked.

The belt holding member 55 includes a pressing portion 56 and a guide portion 59. The pressing portion 56 is disposed on the inner peripheral surface of the fixing belt 26 and faces the pressure roller 19 via the fixing belt 26.
The pressing unit 56 presses the fixing belt 26 toward the pressure roller 19 side.

The guide part 59 has a circular arc shape in cross section and is provided on the opposite side of the pressing part 56 to face the induction heating part 30, and guides the fixing belt 26 so as to rotate along the induction heating part 30.

The sleeve 64 is formed of a nonmagnetic material such as aluminum in a cylindrical shape and is disposed on the inner peripheral surface of the fixing belt 26. The sleeve 64, together with the pressing portion 56 and the guide portion 59, is a fixing belt 26.
Is stretched around.

The pressure roller 19 includes a cylindrical cored bar 19a such as stainless steel, an elastic layer 19b made of, for example, silicone rubber formed on the cored bar 19a, and a mold release made of a fluororesin or the like covering the surface of the elastic layer 19b. A layer 19c. The pressure roller 19 is rotated by a drive source such as a motor (not shown), and the fixing belt 26 is driven to rotate by the rotation of the pressure roller 19. A nip portion N is formed at a portion where the pressure roller 19 and the fixing belt 26 are pressed against each other. The nip portion N heats and presses an unfixed toner image on the paper 9 being transported to fix the toner image on the paper 9. To do.

The induction heating unit 30 includes a coil 37, a bobbin 38, and a magnetic core 39, and heats the fixing belt 26 by electromagnetic induction. The induction heating unit 30 extends in the width direction of the fixing belt 26 (the front and back surfaces of the paper surface in FIG. 2) and is disposed to face the fixing belt 26 so as to surround substantially half of the outer periphery of the fixing belt 26.

The exciting coil 37 is attached to the bobbin 38 by winding a litz wire in a loop shape a plurality of times along the width direction of the fixing belt 26 (front and back direction in FIG. 2). The exciting coil 37 is connected to a power source (not shown) and generates an alternating magnetic flux by a high frequency current supplied from the power source.
A magnetic field from the exciting coil 37 passes through the magnetic core 39, is guided in a direction parallel to the paper surface of FIG. 2, and passes along the induction heating layer 26 a of the fixing belt 26. An eddy current is generated in the induction heat generation layer 26a due to a change in the alternating strength of the magnetic flux passing through the induction heat generation layer 26a. Induction heating layer 26
When an eddy current flows through a, Joule heat is generated by the electrical resistance of the induction heat generating layer 26a, and the fixing belt 26 generates heat.

The thermistor 25 is disposed on the surface of the fixing belt 26 so as to face the center and both ends in the width direction, and detects the temperature of each region. Based on the temperature detected by the thermistor 25, the current supplied to the exciting coil 37 of the induction heating unit 30 is controlled.

The separating member 51 separates the sheet 9 after the fixing process from the surface of the fixing belt 26, and the leading end portion thereof is arranged at a predetermined interval with respect to the surface of the fixing belt 26. The separating member 51 is located near the nip portion N in the vicinity of the downstream side in the rotation direction of the fixing belt 26 and the sleeve 64.
It is arrange | positioned facing. The separating member 51 is made of a horizontally long plate material that extends in the width direction of the fixing belt 26. Note that the separation member 51 may include a plurality of separation claws, and a plurality of separation members 51 may be provided side by side on an attachment member extending in the width direction of the fixing belt 26.

When the fixing belt 26 is heated by the induction heating unit 30 serving as a heating unit and reaches a fixing possible temperature, the sheet 9 sandwiched by the nip portion N is heated and pressurized by the pressure roller 19. The powdered toner on the paper 9 is melted and fixed. Paper 9 after fixing processing
Is conveyed in close contact with the surface of the fixing belt 26, but is separated by the separating member 51.
6 is separated from the surface 6 and conveyed downstream of the fixing device 5. The separating member 51 is the fixing belt 2.
In order to separate the sheet 9 from the fixing belt 26 with a predetermined distance from the surface of 6,
The surface of the fixing belt 26 is not damaged by the separation member 51.

FIG. 3 shows a configuration of a holding mechanism that holds the separation member 51 in a non-contact manner with respect to the surface of the fixing belt 26.
Shown in FIG. 3 is a side sectional view schematically showing the configuration of the holding mechanism.

The holding mechanism includes a support member 61 that supports the separation member 51 in a swingable manner, a spring member 62 that urges the separation member 51 toward the fixing belt 26, and a first magnet that is attached to the distal end portion 51 b of the separation member 51. 66 and a second magnet 67 included in the sleeve 64.

The separating member 51 has a fitting hole 51a formed at both ends in the longitudinal direction, a tip 51b facing the surface of the fixing belt 26, and a spring formed between the fitting hole 51a and the tip 51b. A hanging portion 51c is provided. A support member 61 fixed to a housing (not shown) is engaged with the fitting hole 51 a, so that the separation member 51 can rotate around the support member 61. The spring member 62, which is an elastic member, is formed of a tension coil spring or the like, and one end thereof is fixed to the housing, and the other end is fixed to the spring hook 51c. Due to the biasing force of the spring member 62,
The leading end 51b of the separating member 51 can be rotated toward the fixing belt 26 with the support member 61 as the center of rotation.

A first magnet 66 is provided at the tip 51 b of the separation member 51. The first magnet 66 extends in a plate shape in the longitudinal direction of the separation member 51 and is attached to the distal end portion 51b of the separation member 51 with an adhesive. The first magnet 66 has an S pole on the side fixed to the separation member 51, and an N pole on the surface (first magnetic pole) 66 a facing the fixing belt 26. Note that a plurality of the first magnets 66 may be arranged in the longitudinal direction of the separating member 51.

A second magnet 67 is provided inside the sleeve 64. The second magnet 67 is the sleeve 6
4 is fixed to the housing of the fixing device 5. The second magnet 67 has a trapezoidal shape in a cross-sectional view, and a wider surface (second magnetic pole) 67 a serving as a lower base of the trapezoid is disposed to face the first magnetic pole 66 a of the first magnet 66. The second magnet 67 has an N pole at the second magnetic pole 67a and an S pole at the opposite magnetic pole 67b which is the upper base of the trapezoid. Since the first magnetic pole 66a of the first magnet 66 and the second magnetic pole 67a of the second magnet 67 have the same polarity (both are N poles), the first magnetic pole 66a,
A repulsive magnetic force is generated between the second magnetic pole 67a and the second magnetic pole 67a. The first magnetic pole 66a and the second magnetic pole 67a may be S poles.

Since the second magnet 67 is fixed to the housing of the fixing device 5 and the first magnet 66 is attached to the swingable separating member 51, the second magnet 67 is generated between the first magnetic pole 66a and the second magnetic pole 67a. The repulsive magnetic force acting acts in the direction of separating the separating member 51 from the fixing belt 26. on the other hand,
The biasing force of the spring member 62 acts in a direction in which the separation member 51 is brought closer to the fixing belt 26. Here, the repulsive magnetic force of the first and second magnets 66 and 67 is balanced with the urging force of the spring member 62, so that the front end portion 51 b of the separation member 51 is arranged in non-contact with the surface of the fixing belt 26. .
Further, the magnetic forces of the first magnet 66 and the second magnet 67 are applied to the spring member 62 so that the separation member 51 is held at a position spaced apart from the surface of the fixing belt 26 by a predetermined distance. Is set to a predetermined size.

Thus, the first and second magnets 66 and 67 are provided, and the first and second magnets 66 and 67 are provided.
The separating member 51 has a simple configuration in which the repulsive magnetic force and the biasing force of the spring member 62 are balanced.
Is disposed in a non-contact manner with respect to the surface of the fixing belt 26, and the sheet 9 after the fixing process is disposed on the fixing belt 2.
6 surfaces can be separated.

Further, since the second magnet 67 faces the first magnet 66 and is included in the sleeve 64, the sleeve 64 stretches the fixing belt 26, and is separated at a position where the fixing belt 26 is stretched. Since the member 51 faces the fixing belt 26, the separation member 51 and the fixing belt 26 are separated.
The distance from the surface is stabilized.

(Second Embodiment)
FIG. 4 is a schematic side view illustrating a fixing device including a separation member according to the second embodiment. Second
The embodiment is applied to a fixing device 5 including a lamp heater 45 such as a halogen heater as a heating means. The second embodiment is different from the first embodiment in that the second magnet 67 is included in the fixing roller 23.

The fixing device 5 is a belt fixing method using a heat source of a lamp heater 45, and an endless fixing belt 26 as a heating member, a pressure roller 19 as a pressure member, and a fixing included in the fixing belt 26. A roller 23, a heat roller 27 that stretches the fixing belt 26 together with the fixing roller 23, and a lamp heater 45 included in the heat roller 27 are provided. Further, the fixing device 5 includes a separation member 51 that separates the sheet 9 after the fixing process from the fixing belt 26;
A holding mechanism (spring member 62) that holds the separation member 51 in a non-contact manner with respect to the surface of the fixing belt 26.
, First and second magnets 66, 67). Pressure roller 19 and fixing roller 23
The heat roller 27 is rotatably supported in the longitudinal direction of the housing (not shown) of the fixing device 5, and the separation member 51 is swingably supported by the housing.

The heat roller 27 has a cylindrical cored bar made of a metal such as aluminum or iron having excellent thermal conductivity, and the cored bar is coated with a fluororesin coating or a tube. A lamp heater 45 such as a halogen lamp is provided inside the core of the heat roller 27.

The fixing belt 26 is an endless belt excellent in thermal conductivity, and an outer peripheral surface is coated with an offset preventing agent such as a silicone rubber film.

The fixing roller 23 includes sponge rubber on an aluminum cylindrical base material, and imparts elasticity to the nip portion N. Heat from the lamp heater 45 disposed in the heat roller 27 is transmitted to the fixing belt 26 through the heat roller 27, and the fixing belt 26 is heated.

The pressure roller 19 is a resin in which an elastic layer such as silicone rubber is formed on a cylindrical base material made of synthetic resin, metal or other material, and the surface of the elastic layer is excellent in releasability such as fluororesin. The one covered with is used.

The pressure roller 19 is rotated by a drive source (not shown) such as a motor,
Further, the fixing roller 23 is pressed in the center direction. As a result, the pressure roller 19 comes into pressure contact with the fixing roller 23 via the fixing belt 26, the fixing belt 26 and the fixing roller 23 are driven to rotate, and the fixing belt 26 and the pressure roller 19 are rotated against each other while rotating reversely. A nip portion N is formed at the contacting portion.

The sheet 9 conveyed to the nip portion N is heated and pressed by the fixing belt 26 and the pressure roller 19, whereby the powdery toner on the sheet 9 is melted and fixed. The sheet 9 after the fixing process is conveyed in close contact with the surface of the fixing belt 26, but is separated from the surface of the fixing belt 26 by the separating member 51 and conveyed downstream of the fixing device 5. Since the separation member 51 separates the sheet 9 from the fixing belt 26 with a predetermined distance from the surface of the fixing belt 26, the surface of the fixing belt 26 is not damaged by the separation member 51.

The holding mechanism includes a support member 61 that supports the separation member 51 in a swingable manner, a spring member 62 that urges the separation member 51 toward the fixing belt 26, and a first magnet that is attached to the distal end portion 51 b of the separation member 51. 66 and a second magnet 67 included in the fixing roller 23.

The first magnet 66 extends in a plate shape in the longitudinal direction of the separation member 51 and is attached to the distal end portion 51b of the separation member 51 with an adhesive. The first magnet 66 has an S pole on the side fixed to the separation member 51 and an N pole on a surface (first magnetic pole) 66 a facing the fixing belt 26. Note that a plurality of the first magnets 66 may be arranged in the longitudinal direction of the separating member 51.

The second magnet 67 extends in the roller axial direction inside the fixing roller 23 and is fixed to the housing of the fixing device 5. The second magnet 67 has a trapezoidal shape in a cross-sectional view, and a wider surface (second magnetic pole) 67 a serving as a lower base of the trapezoid is disposed to face the first magnetic pole 66 a of the first magnet 66. The second magnet 67 has an N pole at the second magnetic pole 67a and an S pole at the opposite magnetic pole 67b which is the upper base of the trapezoid. The first magnetic pole 66 a of the first magnet 66 and the second magnetic pole 67 a of the second magnet 67.
Are of the same polarity (both N poles), a repulsive magnetic force is generated between the first magnetic pole 66a and the second magnetic pole 67a. The first magnetic pole 66a and the second magnetic pole 67a may be S poles.

Since the second magnet 67 is fixed to the housing of the fixing device 5 and the first magnet 66 is attached to the swingable separating member 51, the second magnet 67 is generated between the first magnetic pole 66a and the second magnetic pole 67a. The repulsive magnetic force acting acts in the direction of separating the separating member 51 from the fixing belt 26. on the other hand,
The biasing force of the spring member 62 acts in a direction in which the separation member 51 approaches the fixing belt 26. Here, the repulsive magnetic force of the first and second magnets 66 and 67 is balanced with the urging force of the spring member 62, so that the front end portion 51 b of the separation member 51 is arranged in non-contact with the surface of the fixing belt 26. . Further, the magnetic forces of the first magnet 66 and the second magnet 67 are applied to the spring member 62 so that the separation member 51 is held at a position spaced apart from the surface of the fixing belt 26 by a predetermined distance. Is set to a predetermined size.

Thus, the first and second magnets 66 and 67 are provided, and the first and second magnets 66 and 67 are provided.
The separating member 51 has a simple configuration in which the repulsive magnetic force and the biasing force of the spring member 62 are balanced.
Is disposed in a non-contact manner with respect to the surface of the fixing belt 26, and the sheet 9 after the fixing process is disposed on the fixing belt 2.
6 surfaces can be separated.

In the above-described embodiment, an example in which the heating unit is applied to an electromagnetic induction heating method or a belt fixing device including a lamp heater is shown. However, the present invention is not limited thereto, and a heating roller heated by the heating unit, The present invention may also be applied to a roller fixing device that sandwiches a sheet carrying an unfixed toner image at a nip formed by a pressure roller that is in pressure contact with the roller, and melts and fixes the unfixed toner image on the sheet.

INDUSTRIAL APPLICABILITY The present invention can be used for a fixing device used in an image forming apparatus such as a copying machine, a printer, a facsimile, and a composite machine thereof, and an image forming apparatus including the fixing device. Can be used in a fixing device for separating the recording medium from the heating member and an image forming apparatus including the fixing device.

DESCRIPTION OF SYMBOLS 1 Image forming device 5 Fixing device 19 Pressure roller (pressure member)
23 Fixing roller 25 Thermistor 26 Fixing belt (heating member)
27 Heat roller 30 Induction heating unit (heating means)
45 Lamp heater (heating means)
51 Separating member 51a Fitting hole 51b Tip 51c Spring hook 55 Belt holding member 56 Pressing part 59 Guide part 61 Supporting member 62 Spring member (elastic member)
64 Sleeve 66 First magnet 66a First magnetic pole 67 Second magnet 67a Second magnetic pole

Claims (1)

An unfixed toner image on a recording medium is sandwiched by a recording medium carrying an unfixed toner image at a nip formed by a heating member heated by a heating means and a pressure member pressed against the heating member. In a fixing device that melts and fixes
A separation member that is swingably supported on the downstream side of the nip portion with respect to the conveyance direction of the recording medium, and that separates the recording medium after the fixing process from the surface of the heating member;
A first magnet having a first magnetic pole provided at a swinging end of the separation member and facing the heating member;
A second magnet contained in the heating member, opposite to the first magnetic pole and having a second magnetic pole having the same polarity as the first magnetic pole;
An elastic member that urges the separating member in a direction approaching the heating member,
The separating member is disposed at a position away from the surface of the heating member by a predetermined distance by a repulsive magnetic force acting between the first and second magnets and an urging force of the elastic member .
A pressing portion disposed on an inner peripheral surface of the endless heating member and pressing the heating member toward the pressing member;
A fixing device comprising: a sleeve that includes the second magnet and stretches the heating member together with the pressing portion .

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