JP6743550B2 - Image forming device - Google Patents

Description

The present invention relates to an image forming apparatus.

In Japanese Patent Laid-Open No. 2004-242242, a pair of conveying rollers and a recording material fed from the conveying rollers are provided downstream of a fixing device having a first fixing unit and a second fixing unit in a sheet conveying direction. An image forming apparatus including a guide that biases the first fixing unit side is described.

JP 2006-23427 A

An object of the present invention is to convey a recording medium on which an image is formed by sandwiching the recording medium with a heating member and a pressing member, and even when the recording medium is curved toward the heating member, the recording medium is directed toward the pressing member. Even if it is curved, it is to correct the curl.

An image forming apparatus according to a first aspect includes a heating member having an elastic layer formed on a surface thereof, and a pressure member for pressing a recording medium having an image formed thereon toward the heating member, and the rotating heating device. A fixing unit that fixes an image on a recording medium that is conveyed between a member and the pressure member, and a recording medium that is arranged on the downstream side of the fixing unit in the recording medium conveyance direction and is curved toward the heating member. A first straightening portion that is in contact with the first straightening portion that straightens the curl of the recording medium and that is arranged downstream of the first straightening portion in the transport direction and that is in contact with the recording medium that is curved toward the pressure member, A second straightening portion that straightens the curl of the medium.

An image forming apparatus according to a second aspect is the image forming apparatus according to the first aspect , wherein the first straightening unit is the heating member with respect to the conveyance path of the recording medium when viewed from the rotation axis direction of the heating member. The second correction portion is disposed on the side, the second correction portion is pressed by a shaft portion disposed on the pressing member side with respect to the transport path and the recording medium to be transported, as viewed from the rotation axis direction, A recording medium curved toward the pressing member while swinging around a shaft portion to open the transport path, while contacting the first correcting portion and the swinging portion. It is characterized in that the curving habit is corrected by being transported.

An image forming apparatus according to a third aspect is the image forming apparatus according to the first aspect or the second aspect, in which the first straightening portion is in contact with the recording medium curved toward the heating member to bend the recording medium. A guide member for correcting the recording medium and guiding the recording medium to the downstream side in the conveying direction, and a rotating member arranged on the downstream side of the guide member in the conveying direction and rotated according to the conveyed recording medium, It is characterized by including.

An image forming apparatus according to a fourth aspect is the image forming apparatus according to any one of the first to third aspects , wherein the heating member has a circular cross section extending in the rotation axis direction, and the pressing member. Is an endless member that is wound around a part of the heating member to form a sandwiching portion for sandwiching a recording medium between the heating member and the circuit, and to heat the endless member at an outlet portion of the sandwiching portion. A pressing member that pressurizes and presses the member side.

According to the image forming apparatus of the first aspect, it is possible to correct the curl habit even when the recording medium is curved toward the heating member or the recording medium is curved toward the pressing member.

According to the image forming apparatus of the second aspect, in the case where the recording medium is curved toward the heating member, as compared with the case where a plurality of correction members are provided to corrugate the recording medium in the width direction of the recording medium to correct the curl However, even when the recording medium is curved toward the pressing member, the curl can be corrected with a simple configuration.

According to the image forming apparatus of the third aspect, damage to the image formed on the recording medium can be suppressed as compared with the case where the rotating member rubs against the recording medium.

According to the image forming apparatus of the fourth aspect , the curl habit can be corrected even when the thick paper recording medium is curved toward the heating member or the thin paper recording medium is curved toward the pressing member.

FIG. 3 is a configuration diagram illustrating a fixing unit, a discharge roll, and the like included in the image forming apparatus according to the exemplary embodiment of the present invention. 3A and 3B are configuration diagrams illustrating a fixing unit according to an exemplary embodiment of the present invention. 3A and 3B are configuration diagrams illustrating a fixing unit according to an exemplary embodiment of the present invention. FIG. 3 is a configuration diagram illustrating a fixing unit, a discharge roll, and the like included in the image forming apparatus according to the exemplary embodiment of the present invention. 3A and 3B are configuration diagrams illustrating a fixing unit according to an exemplary embodiment of the present invention. 3A and 3B are configuration diagrams illustrating a fixing unit according to an exemplary embodiment of the present invention. FIG. 3 is a configuration diagram illustrating a fixing unit, a discharge roll, and the like included in the image forming apparatus according to the exemplary embodiment of the present invention. FIG. 3 is a cross-sectional view showing a sandwiching portion of a fixing member included in the image forming apparatus according to the exemplary embodiment of the invention. FIG. 3 is a cross-sectional view showing a fixing member of the image forming apparatus according to the exemplary embodiment of the present invention. FIG. 3 is a perspective view showing a lever and the like included in the fixing member of the image forming apparatus according to the exemplary embodiment of the present invention. 1 is a schematic configuration diagram showing an image forming apparatus according to an exemplary embodiment of the present invention.

An example of the image forming apparatus according to the embodiment of the present invention will be described with reference to FIGS. An arrow H shown in the drawing indicates the vertical direction of the apparatus (vertical direction), an arrow W indicates the width direction of the apparatus (horizontal direction), and an arrow D indicates the depth direction of the apparatus (horizontal direction).

(overall structure)
As shown in FIG. 11, in the image forming apparatus 10 according to the present exemplary embodiment, a housing portion in which a sheet member P as an example of a recording medium is housed from the lower side to the upper side in the up-down direction (arrow H direction). 14, the transport unit 16 that transports the sheet member P stored in the storage unit 14, and the image forming unit 20 that forms an image on the sheet member P that is transported by the transport unit 16 from the storage unit 14 in this order. It is equipped.

[Housing]
The accommodating portion 14 is provided with an accommodating member 26 that can be pulled out from the apparatus main body 10A of the image forming apparatus 10 toward the front side in the apparatus depth direction, and the sheet member P is stacked on the accommodating member 26. Further, the accommodating member 26 is provided with a delivery roll 30 that sends out the sheet members P stacked on the accommodating member 26 to a conveyance path 28 that constitutes the conveyance unit 16.

[Transportation part]
In the transport unit 16, a plurality of transport rolls 32 that transport the sheet member P along a transport path 28 that transports the sheet member P sent out from the storage unit 14, and the sheet member P on which an image is formed are provided in the apparatus main body. And a discharge roll 34 that discharges to the outside of 10A.

Further, in the transport unit 16, a transport roll that transports the sheet member P along the reverse transport path 57 through which the sheet member P is transported when an image is formed on the back surface of the sheet member P having the image formed on the front surface. 48 are provided.

[Image forming section]
The image forming unit 20 includes an image forming unit 18 that forms a black (K) image, and an exposure device 42 that irradiates the image carrier 36 provided in the image forming unit 18 with exposure light. ..

The image forming units 18 are attachable to and detachable from the apparatus body 10A. The image forming unit 18 is provided with an image carrier 36 and a charging member 38 that charges the surface of the image carrier 36. Further, the image forming unit 18 is provided with a developing device 40 that develops the electrostatic latent image formed by exposing the charged image carrier 36 to the exposure light by the exposure device 42 to visualize the electrostatic latent image as a toner image. ing. Further, in the image forming unit 20, a transfer roll 46 that transfers the toner image formed on the image carrier 36 to the sheet member P, and the sheet member P to which the toner image is transferred are heated and pressed to form the toner image as a sheet. The fixing unit 50 for fixing the member P is provided. Further, a guide portion 120 that guides the sheet member P is provided on the downstream side of the fixing unit 50 in the sheet member P conveyance direction (hereinafter, “sheet conveyance direction”).

Details of the fixing unit 50 and the guide unit 120 will be described later.

(Operation of image forming apparatus)
In the image forming apparatus 10, an image is formed as follows.

First, the charging member 38 to which a voltage is applied uniformly negatively charges the surface of the image carrier 36 at a predetermined potential. Then, based on the image data received from the outside, the exposure device 42 irradiates the surface of the charged image carrier 36 with exposure light to form an electrostatic latent image.

As a result, an electrostatic latent image corresponding to the data is formed on the surface of the image carrier 36. Further, the developing device 40 develops this electrostatic latent image and visualizes it as a toner image.

Then, the sheet member P sent from the housing member 26 to the transport path 28 by the sending roll 30 is sent to the transfer position T where the image holding member 36 and the transfer roll 46 come into contact with each other. At the transfer position T, the toner image on the surface of the image carrier 36 is transferred to the sheet member P by the sheet member P being conveyed between the image carrier 36 and the transfer roll 46.

The toner image transferred to the sheet member P is fixed to the sheet member P by the fixing unit 50. Then, the sheet member P on which the toner image is fixed is discharged to the outside of the apparatus main body 10A by the discharge roll 34.

(Main composition)
Next, the fixing unit 50 and the guide portion 120 will be described.

[Fixing unit]
As shown in FIG. 1, the fixing unit 50 includes a fixing member 52 as an example of a fixing unit that fixes a toner image onto the sheet member P, and a curl of the sheet member P discharged from the fixing member 52 ( A first straightening unit 90 and a second straightening unit 100 that correct curl) are provided. Further, the fixing unit 50 includes a housing 50A that supports each part. The transport path 28 for the sheet member P passes through the inside of the housing 50A.

[Fixing member]
As shown in FIG. 9, the fixing member 52 includes a heating member 54 and a pressing member 60 that presses the sheet member P conveyed between the heating member 54 and the heating member 54.

The heating member 54 has a cylindrical shape whose axial direction is the apparatus depth direction, and includes a cylindrical body 56 having an elastic layer 56A on the surface thereof, and a heating element 58 arranged inside the cylindrical body 56. Then, the heating member 54 is configured to rotate in the direction of arrow R1 (counterclockwise direction) in the drawing by the rotational force transmitted from a motor (not shown).

The pressure member 60 is an endless (annular) pressure belt 62 as an example of an endless member, and a support arranged inside the pressure belt 62 and supporting the pressure belt 62 so as to be rotatable (rotatably). And a mechanism 64. The support mechanism 64 includes a support member 70 that supports the pressure belt 62, a leaf spring 80, and L-shaped frames 66 and 68.

The pressure belt 62 comes into contact with the heating member 54 on its surface, and is driven (rotated) in the direction of arrow R2 (clockwise direction) in the figure by being driven by the rotating heating member 54.

The support member 70 is integrally formed of a resin material and extends in the depth direction of the device. The support member 70 has a pressing portion 70A that presses the pressure belt 62 against the elastic layer 56A, and an overhanging portion 70B that is upstream of the pressing portion 70A in the sheet conveyance direction and that projects toward the conveyance path 28. doing. The pressing portion 70A is an example of a pressing member.

The support member 70 also has a recess 70C that is separated from the pressure belt 62 between the pressing portion 70A and the overhang portion 70B when viewed from the depth direction of the device. Further, the support member 70 has grooves 70D and 70E at the portion opposite to the heating member 54 side, into which the base ends of the frames 66 and 68 are inserted.

The leaf spring 80 extends in the depth direction of the apparatus, is formed in a U shape when viewed from the depth direction of the apparatus, and is disposed between the concave portion 70C of the support member 70 and the pressure belt 62. The leaf spring 80 is fixed to the recess 70C with a fixing member (not shown). Accordingly, the leaf spring 80 biases the pressure belt 62 toward the heating member 54 side.

As described above, the frames 66, 68 are L-shaped, and the base end side portions thereof are inserted into the grooves 70D, 70E of the support member 70 to support the support member 70. Both ends of the frames 66 and 68 in the apparatus depth direction protrude from the pressure belt 62 and are attached to a skeleton member (not shown).

As a result, the pressure belt 62 is wound around a part of the heating member 54, and forms a sandwiching portion N that sandwiches the sheet member P with the heating member 54. The pressing portion 70A described above presses the pressure belt 62 toward the heating member 54 side at the exit portion of the holding portion N. Further, the sandwiching length for sandwiching the sheet member P by the sandwiching portion N is longer than that in the case where the pressure member has a columnar shape.

In this structure, as shown in FIG. 8, the elastic layer 56A is pressed by the pressing portion 70A via the pressure belt 62, and the elastic layer 56A is recessed. Then, in this recessed portion, an arcuate portion 72 that is recessed in an arc shape is formed at the most downstream portion (exit portion) in the sheet conveying direction. Therefore, when the conveyed sheet member P is a thin sheet (for example, a basis weight of 64 [g/m ² ]) sheet member P (hereinafter referred to as “sheet member P1”), the sheet member P1 has the arc portion 72. When it passes through, it is curved toward the pressure member 60 (anti-image curl).

On the other hand, when the conveyed sheet member P is a thick sheet (for example, a basis weight of 240 [g/m ² ]) sheet member P (hereinafter, “sheet member P2”), the sheet member P is bent as compared with the sheet member P1. High rigidity (strong). Therefore, the sheet member P2 does not bend toward the pressing member 60 even when passing through the arc portion 72. However, as described above, the sandwiching length for sandwiching the sheet member P by the sandwiching portion N is longer than that in the case where the pressing member has a columnar shape. Therefore, the sheet member P2 is deformed following the surface of the heating member 54 and curved toward the heating member 54 (image curl).

[First correction section]
As shown in FIG. 1, the first straightening unit 90 is disposed on the heating member 54 side with respect to the transport path 28 on the downstream side of the fixing member 52 in the sheet transport direction when viewed from the apparatus depth direction. There is. The first straightening unit 90 includes a guide member 92 and a guide roll 96 that is an example of a rotating member that is arranged on the downstream side of the guide member 92 in the sheet member transport direction.

The guide member 92 includes a plurality of plate-shaped guide plates 94 whose plate surfaces face the apparatus depth direction and are arranged in the apparatus depth direction. Each of the guide plates 94 has a conveyance edge 94A that contacts the conveyed sheet member P2, and a contact edge that is downstream of the conveyance edge 94A in the sheet conveyance direction and that contacts a tip portion 104B of a lever 104 described later. 94B and.

In this configuration, as shown in FIGS. 5A and 5B, the guide plate 94 comes into contact with the sheet member P2 curved toward the heating member 54 side at the conveying edge 94A to prevent the sheet member P2 from curving. The sheet member P2 is straightened (releasing the curving tendency) and is guided to the downstream side in the sheet conveying direction. Further, as shown in FIGS. 6A and 6B, the guide roll 96 is rotated by being driven by the sheet member P2 guided by the guide member 92, changing the direction of the leading end of the sheet member P2, The sheet member P2 is guided to the downstream side in the sheet conveying direction. In this way, the curl of the sheet member P2 that is curved toward the heating member 54 is corrected by the first correction section 90.

[Second correction section]
As shown in FIG. 1, the second straightening unit 100 is arranged downstream of the first straightening unit 90 in the sheet conveying direction. The second correction unit 100 includes a shaft portion 106 disposed on the pressing member 60 side with respect to the transport path 28 as viewed from the depth direction of the apparatus, and a swing portion swinging around the shaft portion 106. And a lever 104 as an example.

As shown in FIG. 10, the shaft portion 106 extends with the device depth direction as the axial direction. A plurality of levers 104 are provided such that their plate surfaces face the apparatus depth direction and are aligned in the apparatus depth direction. The base end portion 104A of the lever 104 is swingably supported by the shaft portion 106.

Further, as shown in FIG. 1, the lever 104 extends toward the transport path 28 when viewed from the depth direction of the apparatus. Then, when the sheet member P is not conveyed, the tip portion 104B of the lever 104 contacts the contact edge 94B formed on the guide plate 94, and the swing position of the lever 104 is restricted.

In this configuration, the lever 104 is pushed by the sheet member P to be oscillated and oscillates as shown in FIGS. 2(B), 3(A), 6(A), and (B), and is conveyed. The path 28 (see FIG. 1) is opened.

Here, as shown in FIG. 3A, the opening angle of the lever 104 pushed by the thin sheet member P1 is the opening angle of the lever 104 pushed by the thick sheet member P2 (see FIG. 6B). Is smaller than This is because the rigidity of the sheet member P1 is lower than the rigidity of the sheet member P2. Then, as shown in FIGS. 3A and 3B, the curl of the sheet member P1 that is curved toward the pressing member 60 has a guide roll 96 of the first straightening unit 90 and a tip portion 104B of the lever 104. It is designed to be corrected by being transported while contacting with.

On the other hand, as shown in FIG. 6B, the opening angle of the lever 104 pushed by the thick paper sheet member P2 is the opening angle of the lever 104 when pushed by the thin paper sheet member P1 (see FIG. 3A). ), it becomes larger. Then, as shown in FIGS. 6A and 6B, the sheet member P2 is configured to be conveyed with the conveying path 28 opened largely as compared with the case of the thin sheet member P1. ..

As described above, the conveyance path 28 of the sheet member P is different between the thin sheet member P1 and the thick sheet member P, and as shown in FIG. 1, the sheet member P1 is conveyed along the conveyance path 28A. The sheet member P2 is conveyed along the conveyance path 28B. Therefore, the transport path 28 is a concept including the transport path 28A and the transport path 28B.

Here, in the transport path 28A, the posture of the sheet member P1 in a state where the front end side portion of the sheet member P1 is sandwiched by the discharge rolls 34 and the base end side portion of the sheet member P1 is sandwiched by the fixing member 52. Is synonymous with (see FIG. 4). Further, in the transport path 28B, the posture of the sheet member P2 in a state where the leading end side portion of the sheet member P2 is sandwiched by the discharge rolls 34 and the proximal end side portion of the sheet member P2 is sandwiched by the fixing member 52. They are synonymous (see FIG. 7).

[Other]
As shown in FIGS. 1 and 10, a plurality of guide plates 108 for guiding the conveyed sheet member P toward the discharge roll 34 are arranged between the adjacent levers 104.

In this structure, as shown in FIG. 7, the guide plate 108 contacts the sheet member P2 and guides the sheet member P2 toward the discharge roll 34.

[Guide]
As shown in FIG. 1, the guide portion 120 is arranged on the downstream side of the fixing unit 50 and on the upstream side of the discharge roll 34 in the sheet conveying direction. In addition, the guide unit 120 includes a guide member 122 arranged on the upper side of the conveyance path 28 and a guide member 124 arranged on the opposite side of the guide member 122 with the conveyance path 28 interposed therebetween.

In this configuration, the guide portion 120 is configured to guide the sheet member P that has passed through the fixing unit 50 toward the discharge roll 34.

(Action)
Next, the operation of the fixing unit 50 and the like will be described.

The operation of the fixing unit 50 and the like will be described separately for the case where the thin sheet member P1 passes the fixing member 52 and the case where the thick sheet member P2 passes the fixing member 52.

-When thin paper passes through-
As shown in FIGS. 2A and 2B, the fixing member 52 is a sheet member on which a toner image is transferred between the rotating heating member 54 and the rotating pressure belt 62 of the pressure member 60. P1 is pinched and conveyed. Here, the sheet member P1 bends (curls) toward the pressing member 60 side as the elastic layer 56A passes through the circular arc portion 72 (see FIG. 8) that is recessed in a circular hole shape. Then, the leading end of the conveyed sheet member P1 contacts the lever 104.

As shown in FIG. 3A, the lever 104 is pushed by the conveyed sheet member P1 and swings to open the conveyance path 28 (see FIG. 1). Then, as shown in FIG. 3B, the sheet member P1 that is curved toward the pressing member 60 is conveyed while contacting the guide roll 96 of the first straightening unit 90 and the leading end 104B of the lever 104. It As a result, the curl of the sheet member P1 that is curved toward the pressure member 60 is corrected.

Further, as shown in FIG. 4, the guide portion 120 guides the sheet member P1 whose curl is corrected toward the discharge roll 34. Further, the discharge roll 34 discharges the sheet member P1 to the outside of the apparatus main body 10A.

-When thick paper passes through-
As shown in FIGS. 5A and 5B, the fixing member 52 is a sheet member on which a toner image is transferred between the rotating heating member 54 and the rotating pressure belt 62 of the pressure member 60. P2 is sandwiched and conveyed. Here, the sandwiching length for sandwiching the sheet member P by the sandwiching portion N is longer than that in the case where the pressing member has a columnar shape (see FIG. 8 ). Therefore, the sheet member P2 is deformed following the surface of the heating member 54 and is curved (curled) toward the heating member 54 side. Then, the leading end portion of the sheet member P1 conveyed by the fixing member 52 contacts the conveyance edge 94A of the guide plate 94. When the pressure member has a columnar shape as in the conventional case, the sheet member P is always curved toward the pressure member 60.

The guide member 92 contacts the sheet member P2 that is curved toward the heating member 54, corrects the curl of the sheet member P2, and guides the sheet member P2 to the downstream side in the sheet conveying direction. Further, as shown in FIGS. 6A and 6B, the guide roll 96 rotates following the sheet member P2 guided by the guide member 92, and changes the direction of the tip of the sheet member P2. The sheet member P2 is guided to the downstream side in the sheet conveying direction. Thereby, the curl of the sheet member P2 curved toward the heating member 54 is corrected. Then, the leading end of the conveyed sheet member P2 contacts the lever 104. The lever 104 is pushed by the conveyed sheet member P2 and swings to open the conveyance path 28 (see FIG. 1).

As shown in FIGS. 6A and 6B, the sheet member P2 in which the curving habit is corrected by the first correction portion 90 opens the conveyance path 28 largely as compared with the case of the thin sheet member P1. Let it be transported. Then, the sheet member P2 is conveyed while contacting the guide plate 108.

Further, the guide portion 120 guides the sheet member P2 toward the discharge roll 34. Further, the discharge roll 34 discharges the sheet member P2 to the outside of the apparatus main body 10A.

(Summary)
As described above, in the image forming apparatus 10, the curl habit is corrected regardless of whether the sheet member P is curved toward the heating member 54 or the sheet member P is curved toward the pressing member 60.

Further, since the opening angle of the lever 104 pushed and swung by the sheet member P1 is different from the opening angle of the lever 104 pushed and swung by the sheet member P2, the conveyance path of the sheet member P1 and the sheet member P2 is different. 28 is changing. As described above, by changing the transport path 28, even when the sheet member P is curved to one side, as compared with the case where a plurality of straightening rolls are provided to corrugate the sheet member P in the width direction of the sheet member P to correct the curving habit. Even when curved to the other side, the curving habit is corrected with a simple configuration.

Further, the first correction section 90 is configured to include a guide member 92 and a guide roll 96 arranged on the downstream side of the guide member 92 in the sheet conveying direction. Then, as the guide roll 96 rotates following the conveyed sheet member P2, the first straightening unit 90 changes the direction of the leading edge of the sheet member P2 and sends the sheet member P to the downstream side of the conveyance path 28B. It is like this. Here, in the case where the image surface of the sheet member P2 on which the image is formed contacts the guide roll 96, the image formed on the sheet member P2 is compared to when the guide roll rubs against the sheet member P2. Damage is suppressed.

Further, since the pressure belt 62 is wound around a part of the heating member 54, the sandwiching portion N (see FIG. 8) becomes longer than when the pressure member has a cylindrical shape. Therefore, the sheet member P2 bends toward the heating member 54 side. Further, the sheet member P1 bends toward the pressing member 60 side by passing through the arc portion 72. As described above, the curl is corrected even when the thin sheet member P1 is curved toward the pressing member 60 or the thick sheet member P2 is curved toward the heating member 54.

Although the present invention has been described in detail with respect to a specific embodiment, the present invention is not limited to the embodiment, and various other embodiments can be taken within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above-described embodiment, the first correction section 90 and the second correction section 100 are provided in the fixing unit 50, but the first correction section 90 may be provided in a part other than the fixing unit 50. The second correction unit 100 may be provided in a part other than the fixing unit 50.

Further, in the above embodiment, the first correction section 90 is configured to include the guide member 92 and the guide roll 96, but it is sufficient that the curl habit can be corrected, and the guide roll 96 may not be provided. .. In this case, the action produced by providing the guide roll 96 does not occur.

Further, in the above-described embodiment, the swingable lever 104 is provided, but the opening degree may be changed between the sheet member P1 and the sheet member P2, and a member that moves differently from swinging may be used.

10 Image Forming Device 28 Conveying Route 28A Conveying Route 28B Conveying Route 52 Fixing Member (Example of Fixing Unit)
54 heating member 56A elastic layer 60 pressing member 62 pressing belt (endless member)
70A pressing part (an example of pressing member)
90 first straightening unit 92 guide member 96 guide roll (an example of a rotating member)
100 Second Correction Unit 104 Lever (Example of Swing Unit)
106 Shaft portion N Nip portion P Sheet member P1 Sheet member (thin paper)
P2 sheet member (cardboard)

Claims (4)

A heating member having an elastic layer formed on its surface, and a pressing member for pressing the recording medium on which an image is formed toward the heating member, and between the rotating heating member and the pressing member. A fixing unit for fixing an image on a recording medium conveyed,
A first straightening unit which is arranged on the downstream side of the fixing unit in the transport direction of the recording medium, contacts the recording medium curved toward the heating member, and corrects the curl of the recording medium;
A second straightening unit arranged downstream of the first straightening unit in the transport direction, in contact with the recording medium curved toward the pressure member, and straightening the curl of the recording medium;
The second straightening portion is a portion on the downstream side with respect to the portion of the recording medium that is in contact with the first straightening portion in the transport direction, and is separated from the first straightening portion in the transport direction. An image forming device that comes into contact with a portion of a recording medium that is present The first straightening unit is disposed on the heating member side with respect to the conveyance path of the recording medium when viewed from the rotation axis direction of the heating member,
The second straightening unit is pressed by the shaft portion arranged on the pressure member side with respect to the transport path and the recording medium to be transported, as viewed from the rotation axis direction, and is centered on the shaft portion. A swing unit that swings to open the transport path,
The image forming apparatus according to claim 1, wherein the recording medium curved toward the pressing member is conveyed while being in contact with the first correction unit and the swinging unit to correct the curl. The first correction unit,
A guide member that contacts the recording medium curved toward the heating member to correct the curl of the recording medium and guides the recording medium to the downstream side in the transport direction,
The image forming apparatus according to claim 1 or 2, further comprising: a rotating member that is disposed on a downstream side of the guide member in the transport direction and that is rotated by being driven by a transported recording medium. The heating member has a circular cross section extending in the rotation axis direction,
The pressurizing member is wound around a part of the heating member to form a sandwiching part for sandwiching a recording medium between the heating member and the endless member which circulates around the sandwiching part, and the endless part at the exit part of the sandwiching part. The image forming apparatus according to claim 1, further comprising a pressing member that presses a member toward the heating member.

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