JP4905422B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  Conventionally, in an image forming apparatus, when a recording medium (for example, paper) is discharged to a predetermined discharge destination (for example, a discharge tray), curling (bending wrinkles) may occur in the discharged recording medium. It was.

  If this curl occurs, the front end in the transport direction of the newly ejected recording medium may abut against the rear end in the transport direction of the ejected recording medium. In this case, the ejected recording medium May be pushed out of the discharge destination.

For such problems, conventionally, as a means for suppressing the curl as described above, by rotating the rotating body with the arm, the rear end portion in the transport direction of the discharged recording medium is pressed by the arm from above, A technique for suppressing curling has been proposed (see, for example, Patent Document 1).
JP 2000-219396 A

  Incidentally, the direction of curl as described above depends on the characteristics of the image forming apparatus (for example, the structure of the transport mechanism, etc.), as shown in FIGS. 14A and 14B. The orientation may be such that a downwardly convex arc is represented in a cross section perpendicular to the vertical axis. In this case, the curl is perpendicular to both the transport direction and the thickness direction of the recording medium (hereinafter, this direction is referred to as the width direction of the recording medium). The curl will gradually warp as it gets closer.

  In an image forming apparatus in which such curling occurs, when the technique described in Patent Document 1 is applied and curling is to be suppressed with two arms 100 as shown in FIG. If the distance D1 between the arms 100 is excessively narrow with respect to the width W1, the portions protruding on both sides of the arm 100 cannot be pressed down well, and the effect of suppressing curling becomes low.

  However, on the other hand, as shown in FIG. 14B, if the distance D2 between the arms 100 is excessively wide, the discharged recording medium curls more than expected, and thus the distance D2 between the arms 100 becomes larger. The width W2 of the recording medium becomes narrow, and even if the arm 100 is swung down straight from above, the arm 100 cannot be brought into contact with the recording medium and the curl cannot be pushed out. There was a risk of falling.

  The present invention has been made to solve the above problem, and even when the ejected recording medium is largely curled, the ejected recording medium can be pressed at a position closer to the end in the width direction. Thus, an object of the present invention is to provide an image forming apparatus capable of enhancing the curling suppression effect.

Hereinafter, the configuration employed to achieve the above object in the present invention will be described.
According to a first aspect of the present invention, there is provided the image forming apparatus according to the first aspect, wherein the image forming unit for forming an image on the recording medium and the recording medium on which the image is formed by the image forming unit are discharged to a predetermined discharge destination. And a curling suppression means having a movable body that is displaceable between a first position and a second position closer to the end in the width direction than the first position, the movable body being a recording medium by the discharging means when starting the discharge is displaced from the previous SL first position to the second position, the movable body is discharged previously recording the transport direction front end of the newly discharged recording medium from the discharging means to discharge destination When the recording medium is discharged to a position beyond the rear end in the conveyance direction of the medium , the second recording medium is displaced from the second position to the first position , and the discharged recording medium is further down in a cross section perpendicular to the conveyance direction of the recording medium. Curled so that a convex arc appears, and the width direction of the recording medium For, in the case that is the form as Yuku up gradually warped enough becomes near both ends near the center between both ends as nadir, the movable member is displaced from the first position to the second position, the discharge already as curl in the conveying direction trailing end of the recording medium is spread, and displaced toward a position where the movable body corresponds to a circular arc at both ends from a position corresponding to near the center of the arc, newly from the discharge means transport direction front end of the recording medium discharged is prevented from impinging on the conveying direction trailing end of the discharge already recording medium, whereas, the movable member is displaced from the second position to the first position, newly discharged has been the recording medium, characterized in Rukoto is prevented from being caught in the movable member.

  According to such an image forming apparatus, the curl suppression means displaces the movable body from the first position to the second position, thereby pushing the trailing end in the transport direction of the discharged recording medium with the movable body, Curling is suppressed so that the discharged recording medium does not get in the way when a newly discharged recording medium is discharged.

  Therefore, with such an image forming apparatus, it is possible to prevent the front end in the transport direction of the newly ejected recording medium from striking the rear end in the transport direction of the ejected recording medium. It can be prevented from being pushed out from the discharge destination.

  According to such an image forming apparatus, when the movable body is displaced from the first position to the second position, the movable body moves from a position corresponding to the vicinity of the center of the arc toward a position corresponding to both ends of the arc. Will be displaced. That is, the movable body does not simply swing the arm from the upper side to the lower side with respect to the recording medium as in the conventional product, but the position from the center to the end side in the width direction of the discharged recording medium. Will be moved to.

  Therefore, with such an image forming apparatus, even if the discharged recording medium is largely curled, the movable body can press the discharged recording medium closer to the end in the width direction. Thereby, the curl suppression effect can be enhanced.

  Further, according to such an image forming apparatus, if the front end in the transport direction of the newly ejected recording medium is ejected to a position exceeding the rear end in the transport direction of the ejected recording medium, then the second By displacing from the position to the first position, the newly ejected recording medium is prevented from being caught by the movable body.

Therefore, with such an image forming apparatus, the newly ejected recording medium is smoothly ejected to a predetermined ejection destination without being caught by the movable body.
By the way, in the image forming apparatus of the present invention, it is preferable that the movable body is configured to be displaced in a direction accompanied by a downward movement when displaced from the first position to the second position.

  In such an image forming apparatus, when the curl suppressing unit is displaced from the first position to the second position, the movable body is lowered, so that the movable body is horizontally displaced while maintaining the same height. The effect of pushing down the end in the width direction of the recording medium can be enhanced as compared with the case of adopting.

  Further, the image forming apparatus of the present invention includes a plurality of sets of the curl suppressing means each including the movable body, and at least according to the size of the recording medium ejected from the ejecting means. It is preferable that the set of curl suppressing means is configured to be operable.

  With such an image forming apparatus, it is possible to press and widen the end in the width direction with at least one set of curl suppression means according to the size of the recording medium to be discharged. Even a medium can curl.

  In the image forming apparatus according to the aspect of the invention, the discharge unit may include a roller through which the recording medium to be discharged passes above, and the movable body is below an upper limit position reached by an outer peripheral surface of the roller. It is preferable to be disposed in the area.

  This point will be described in detail. First, the movable body itself can be disposed on either the upper side or the lower side of the upper limit position. However, no matter which side is disposed, when the movable body is displaced to the second position, at least a part of the movable body moves downward from the upper limit position, thereby pressing down the recording medium. .

  When the movable body is disposed above the upper limit position, when the movable body is displaced from the first position to the second position, the movable body is displaced from the upper side to the lower side than the upper limit position. In this case, a part of the movable body is in a state of crossing the recording medium discharge path. Therefore, when the recording medium is ejected from the ejecting means in this state, the front end of the newly ejected recording medium collides with the movable body. It is necessary to strictly control the operation timing and the recording medium discharge timing.

  On the other hand, when the movable body is disposed below the upper limit position, even if the movable body is displaced from the first position to the second position, the movable body is only below the upper limit position. In this case, the movable body does not cross the discharge path of the recording medium. Therefore, in this case, when the recording medium is ejected from the ejection means, the front end of the newly ejected recording medium does not collide with the movable body, and the operation timing of the movable body and the ejection of the recording medium It is not necessary to control the timing excessively and strictly.

  That is, in the case where the roller as described above is provided, if the movable body is disposed below the upper limit position, the operation timing of the movable body and the discharge timing of the recording medium need not be controlled excessively strictly. When the recording medium is newly ejected, the movable body does not get in the way.

In the image forming apparatus of the present invention, it is preferable that the movable body is disposed above a lower limit position reached by the outer peripheral surface of the roller.
With such an image forming apparatus, the structure including the movable body and the roller can be made compact in the height direction. Therefore, when the height of the entire image forming apparatus is determined, the structure is below the lower limit position. As compared with the case where the movable body is disposed on the side, it is possible to secure a larger stacking space for the discharged recording medium secured below the movable body. Further, when the size of the stacking space is determined, the height of the image forming apparatus can be suppressed as compared with the case where the movable body is disposed below the lower limit position.

Next, embodiments of the present invention will be described with some specific examples.
[First Embodiment]
1.1. Configuration of Laser Printer FIG. 1 is a cross-sectional view illustrating a schematic configuration of a laser printer 1 according to the present embodiment. FIG. 2 is an explanatory diagram of the curl suppressing unit 10 at the first position. FIG. 3 is an explanatory diagram of the curl suppressing unit 10 at the first position. FIG. 4 is an explanatory diagram of the curl suppressing unit 10 at the second position. FIG. 5 is an explanatory diagram of the curl suppression unit 10 at the second position.

As shown in FIG. 1, the laser printer 1 includes a main body casing 3, a paper feed tray 4, a feeder unit 5, an image forming unit 6, a discharge unit 8, and a curl suppressing unit 10.
The main casing 3 accommodates the paper feed tray 4, the feeder unit 5, the image forming unit 6, the discharge unit 8, and the curl suppressing unit 10 therein. An opening 12 and a twisting tray 14 are formed in the main casing 3.

  The opening 12 is an opening for discharging the paper on which the image is formed by the image forming unit 6 from the inside of the main body casing 3 to the outside, and is formed in the upper part of the main body casing 3. The discharge tray 14 is a tray on which the sheets discharged from the opening 12 are stacked, and is formed on the upper surface of the main body casing 3.

The paper feed tray 4 is a well-known one on which paper to be supplied to the image forming unit 6 is stacked, and is disposed in the lower part of the main body casing 3.
The feeder unit 5 includes a paper feed roller 20, a separation roller 21, and a separation pad 22, and is disposed on the upper side of the paper feed tray 4.

  The paper feed roller 20 is a roller for feeding out the contacted paper from the paper feed tray 4, and is disposed at a position in contact with the uppermost paper among the papers stacked on the paper feed tray 4. The separation roller 21 and the separation pad 22 feed the paper fed from the paper feed tray 4 by the paper feed roller 20 to the image forming unit 6 one by one.

The image forming unit 6 includes a laser scanner unit 16, a process cartridge 17, and a fixing unit 18, and forms an image on a sheet by an electrophotographic method.
The laser scanner unit 16 irradiates a laser beam on the basis of image data received from the outside, and scans the surface of the photosensitive drum 24 described later with the laser beam, thereby electrostatic latent images on the surface of the photosensitive drum 24. It forms an image.

  The process cartridge 17 includes a developer case 23 and a photosensitive drum 24. The developer case 23 accommodates toner as a developer therein. The photosensitive drum 24 is a member on which an electrostatic latent image is formed on the surface by a laser beam from the laser scanner unit 16. The electrostatic latent image is developed with toner supplied from the developer case 23, and the developed toner is developed. An image is transferred from the photosensitive drum 24 to a sheet.

  The fixing unit 18 includes a heating roller 25 and a pressure roller 26. The fixing unit 18 heat-fixes the toner image on the sheet by sandwiching the sheet on which the toner image is transferred by the process cartridge 17 between the heating roller 25 and the pressure roller 26.

As shown in FIGS. 1 and 2, the discharge unit 8 includes four discharge rollers 27 and four pinch rollers 29.
The four discharge rollers 27 are fixed at regular intervals on a shaft that is rotationally driven by a motor (not shown), and are configured to rotate integrally with the shaft. Further, the discharge roller 27 is disposed at a position above the path through which the paper from the image forming unit 6 passes and in contact with the upper surface of the paper that passes. One pinch roller 29 is disposed in a rotatable state, one at a position facing the discharge rollers 27 on the lower side of the discharge rollers 27 through which the discharged paper passes the upper side.

  When the discharge roller 27 rotates, the discharge unit 8 configured as described above imparts a conveyance force to the sheet sandwiched between the discharge roller 27 and the pinch roller 29 and discharges the sheet to the discharge tray 14.

1.2. Details of Curling Suppression Unit As shown in FIGS. 1 to 5, the curling suppression unit 10 includes two movable bodies 30 and 31 and two rotary solenoids (not shown).

  The movable bodies 30 and 31 are L-shaped rubber thin plate-like members, and are configured to be rotationally driven by transmitting a driving force from a rotary solenoid. Further, the movable body 30 is formed with a first portion 35 including a rotation center and a second portion 36 located farther from the rotation center than the first portion 35. Further, similarly to the movable body 30, a first portion 37 and a second portion 38 are formed on the movable body 31.

  The movable body 30 is disposed between the pinch roller 29 on the left end side in the width direction of the discharge tray 14 and the adjacent pinch roller 29. The movable body 31 is disposed between the pinch roller 29 on the right end side in the width direction of the discharge tray 14 and the adjacent pinch roller 29.

Furthermore, the movable bodies 30 and 31 are disposed so as to be below the upper limit position reached by the outer peripheral surface of the pinch roller 29 and above the lower limit position reached by the outer peripheral surface.
Furthermore, the movable bodies 30 and 31 are displaced to the first position or the second position by being rotationally driven.

  As shown in FIGS. 2 and 3, when the paper is discharged to the discharge tray 14, the movable bodies 30 and 31 are in the first position. When the movable bodies 30 and 31 are located at the first position, even if the paper is discharged from the discharge unit 8, the paper is discharged onto the discharge tray 14 without being caught by the movable bodies 30 and 31.

  When the paper has been discharged, the movable bodies 30 and 31 are rotationally driven so that the second portions 36 and 38 move away from each other, and are displaced from the first position to the second position. When the movable bodies 30 and 31 are displaced to the second position, the movable bodies 30 and 31 expand from the vicinity of the center in the width direction of the paper toward the both ends in the width direction. At this time, the movable bodies 30 and 31 push and widen both ends in the width direction of the discharged paper, and push the paper curl.

  When the front end in the transport direction of the next newly ejected sheet is ejected to a position exceeding the rear end in the transport direction of the ejected sheet, the movable bodies 30 and 31 are then moved to the second portions 36 and 38, respectively. It is rotationally driven so as to approach each other, and is displaced from the second position to the first position. As a result, the movable bodies 30 and 31 are retracted to a position where the sheet is not caught again.

The operation of the movable bodies 30 and 31 as described above is repeated every time one sheet is discharged.
1.3. Effects of the present embodiment In the curl suppressing unit 10 of the first embodiment described above, the movable bodies 30 and 31 are displaced from the first position to the second position, thereby pushing the rear end in the transport direction of the discharged paper. It has a configuration like this. Therefore, the curl suppressing unit 10 spreads the rear end in the transport direction of the discharged paper by the movable bodies 30 and 31 to suppress the curling, and the discharged paper is obstructed when the newly discharged paper is discharged. Will not be.

  Therefore, with the laser printer 1 having such a curl suppressing unit 10, it is possible to prevent the front end of the newly ejected paper in the transport direction from striking the rear end of the ejected paper in the transport direction. Pushing out of the discharge tray 14 can be prevented.

  Further, when the movable bodies 30 and 31 are displaced from the first position to the second position, the movable bodies 30 and 31 move from positions corresponding to the vicinity of the center in the curl width direction of the discharged paper toward positions corresponding to both ends. Will be displaced.

  Therefore, in the case of the laser printer 1 having such a curl suppressing unit 10, even if the discharged paper is largely curled, the movable bodies 30 and 31 are arranged at a position closer to the end in the width direction. It is possible to suppress the curling, thereby enhancing the curl suppressing effect.

  Further, when the front end in the transport direction of the newly ejected paper is ejected to a position exceeding the rear end in the transport direction of the ejected paper, the paper is then newly ejected by being displaced from the second position to the first position. Thus, it is possible to prevent the paper sheet from being caught on the movable bodies 30 and 31.

  Therefore, if the laser printer 1 includes such a curl suppressing unit 10, the newly discharged paper is smoothly discharged to the discharge tray 14 without being caught by the movable bodies 30 and 31.

Further, the movable bodies 30 and 31 are disposed so as to be lower than the upper limit position reached by the outer peripheral surface of the pinch roller 29 and above the lower limit position reached by the outer peripheral surface.
In the case of the laser printer 1 having such a configuration, even when the movable bodies 30 and 31 are located at the first position and the second position, the discharge of the paper is not prevented, and when the newly discharged paper is discharged. The movable bodies 30 and 31 do not get in the way.

  In the case of the laser printer 1 having such a configuration, when the height of the laser printer 1 is constant, the laser printer 1 discharges more than the one in which the movable bodies 30 and 31 are disposed below the lower limit position. A large tray 14 can be secured.

  Further, in the case of the laser printer 1 having such a configuration, when the stacking capacity of the discharge tray 14 is constant, the laser is compared with that in which the movable bodies 30 and 31 are disposed below the lower limit position. The printer 1 does not have a bulky structure.

[Second Embodiment]
2.1. Details of Curling Suppression Unit FIG. 6 is an explanatory diagram of the curl suppression unit 40 at the first position in the present embodiment. FIG. 7 is an explanatory diagram of the curl suppressing unit 40 at the first position. FIG. 8 is an explanatory diagram of the curl suppressing unit 40 at the second position. FIG. 9 is an explanatory diagram of the curl suppressing unit 40 at the second position.

  The curl suppressing unit 40 in the present embodiment includes two movable bodies 42 and 43 and two rotary solenoids (not shown). Further, the shapes and materials of the movable bodies 42 and 43 are the same as those of the movable bodies 30 and 31 of the first embodiment. Below, a different part from the movable body of 1st Embodiment is demonstrated.

  The movable body 42 is disposed between the pinch roller 29 on the left end side in the width direction of the discharge tray 14 and the adjacent pinch roller 29. The movable body 43 is disposed between the pinch roller 29 on the right end side in the width direction of the discharge tray 14 and the adjacent pinch roller 29.

  Further, as shown in FIGS. 7 and 9, when the movable body 42 is visually recognized from the front side to the rear side of the laser printer 1, the movable body 42 has a rotation axis with a predetermined angle in the counterclockwise direction with respect to the vertical axis. It is configured to form θ1. Further, when the movable body 43 is visually recognized from the front side to the rear side of the laser printer 1, the movable body 43 is configured such that the rotation axis forms a predetermined angle θ1 in the clockwise direction with respect to the vertical axis.

When such movable bodies 42 and 43 are displaced from the first position to the second position, the end portion that is not the center of rotation is displaced in the direction accompanied by the descent.
2.2. Advantages of the present embodiment With the laser printer 1 having such a curl suppressing unit 40, when the movable bodies 42 and 43 are displaced from the first position to the second position, they are not the rotation centers of the movable bodies 42 and 43. The end is lowered. Therefore, compared to the case where the movable bodies 30 and 31 are horizontally displaced while maintaining the same height as in the curl suppressing unit 10 of the first embodiment, the effect of pushing down the widthwise end of the discharged paper is enhanced. Can do.

[Third Embodiment]
3.1. Details of Curling Suppression Unit FIG. 10 is an explanatory diagram of the curl suppression unit 50 at the first position in the present embodiment. FIG. 11 is an explanatory diagram of the curl suppressing unit 50 at the first position. FIG. 12 is an explanatory diagram of the curl suppressing unit 50 at the second position. FIG. 13 is an explanatory diagram of the curl suppressing unit 50 at the second position.

  The curl suppressing unit 50 in the present embodiment includes two movable bodies 52 and 53 and two rotary solenoids (not shown). Further, the shapes and materials of the movable bodies 52 and 53 are the same as those of the movable bodies 30 and 31 of the first embodiment. Below, a different part from the movable body of 1st Embodiment is demonstrated.

  The movable body 52 is disposed between the pinch roller 29 on the left end side in the width direction of the discharge tray 14 and the adjacent pinch roller 29. The movable body 53 is disposed between the pinch roller 29 on the right end side in the width direction of the discharge tray 14 and the adjacent pinch roller 29.

  Also, as shown in FIGS. 11 and 13, when the movable bodies 52 and 53 are viewed from the right side to the left side of the laser printer 1, the movable bodies 52 and 53 have a rotation axis counterclockwise to the vertical axis. Are configured to form a predetermined angle θ2.

When such movable bodies 52 and 53 are displaced from the first position to the second position, the end portion that is not the center of rotation is displaced in a direction accompanied by the descent.
3.2. Advantages of the present embodiment With the laser printer 1 having such a curl suppressing unit 50, when the movable bodies 52 and 53 are displaced from the first position to the second position, they are not the rotation centers of the movable bodies 52 and 53. The end is lowered. Therefore, compared to the case where the movable bodies 30 and 31 are horizontally displaced while maintaining the same height as in the curl suppressing unit 10 of the first embodiment, the effect of pushing down the widthwise end of the discharged paper is enhanced. Can do.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to said specific one Embodiment, In addition, it can implement with a various form.

  In the laser printer of the above embodiment, an example in which only one set of curl suppression units having two movable bodies is shown, but the number of sets of curl suppression units is not limited to this. For example, a plurality of sets of curl control units may be provided, and at least one set of curl control units may be configured to be operable according to the size of the paper to be discharged.

  With such a laser printer, the edge in the width direction can be pushed and widened by at least one set of curl suppression units according to the size of the paper to be discharged. Can be suppressed.

  In the above embodiment, the movable body is rotationally driven by a rotary solenoid, but the drive source is not limited to this. For example, when a sheet is ejected, a lever that is displaced from one position to the other by a force received from the sheet as the sheet abuts is provided on the sheet transport path, and the lever is displaced. A structure in which the movable body is displaced in conjunction with this may be employed.

With such a structure, it is possible to synchronize the sheet discharge timing and the movable member operation timing only by optimizing the position of the lever.
In the above embodiment, it has been described that the movable body is a rubber member, but the material of the movable body is not limited to this. Specifically, a thin plate member made of plastic may be adopted as the movable body.

  If it is a relatively flexible member such as rubber or plastic, it is strong enough to push the edges of the paper, and it can be easily used as a movable body that does not hurt even if it is touched by mistake. Moreover, it can be configured at low cost.

It is sectional drawing showing schematic structure of the laser printer demonstrated as 1st Embodiment of this invention. It is explanatory drawing of the curl suppression part of the 1st position in 1st Embodiment. It is explanatory drawing of the curl suppression part of the 1st position in 1st Embodiment. It is explanatory drawing of the curl suppression part of the 2nd position in 1st Embodiment. It is explanatory drawing of the curl suppression part of the 2nd position in 1st Embodiment. It is explanatory drawing of the curl suppression part of the 1st position in 2nd Embodiment. It is explanatory drawing of the curl suppression part of the 1st position in 2nd Embodiment. It is explanatory drawing of the curl suppression part of the 2nd position in 2nd Embodiment. It is explanatory drawing of the curl suppression part of the 2nd position in 2nd Embodiment. It is explanatory drawing of the curl suppression part of the 1st position in 3rd Embodiment. It is explanatory drawing of the curl suppression part of the 1st position in 3rd Embodiment. It is explanatory drawing of the curl suppression part of the 2nd position in 3rd Embodiment. It is explanatory drawing of the curl suppression part of the 2nd position in 3rd Embodiment. It is explanatory drawing of a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Laser printer, 3 ... Main body casing, 4 ... Paper feed tray, 5 ... Feeder part, 6 ... Image forming part, 8 ... Discharge part, 10, 40, 50. ..Curl suppression unit, 12... Opening, 14... Discharge tray, 16... Laser scanner unit, 17... Process cartridge, 18. 21 ... Separation roller, 22 ... Separation pad, 23 ... Developer case, 24 ... Photosensitive drum, 25 ... Heating roller, 26 ... Pressure roller, 27 ... Discharge Roller, 28 ... Roller shaft, 29 ... Pinch roller, 30, 31, 42, 43, 52, 53 ... Movable body, 35, 37 ... First part, 36, 38 ... First 2 parts.

Claims (5)

Image forming means for forming an image on a recording medium;
A discharge unit that discharges the recording medium on which the image is formed by the image forming unit to a predetermined discharge destination;
A curl suppressing means having a movable body that is displaceable between a first position and a second position closer to the end in the width direction than the first position;
The movable body, when starting the discharge of the recording medium by the ejection means is displaced from the previous SL first position to the second position,
The movable body, when conveying forward end of the newly discharged recording medium from said discharge means is discharged to a position beyond the conveying direction trailing end of the discharge already recording medium to the discharge destination, the second Displacement from position to said first position ;
Further, the discharged recording medium is curled so that a downwardly convex arc appears in a cross section perpendicular to the conveyance direction of the recording medium, and the vicinity of the center between both ends in the width direction of the recording medium is In the case where the lowermost point is gradually warped toward the both ends, the movable body is displaced from the first position to the second position , whereby the discharged recording target is recorded. as the curl of the conveying direction trailing end of the medium is spread, and displaced toward the positions corresponding to both ends of the arc from the position where the movable body corresponds to the vicinity of the center of the circular arc, newly from said discharge means Preventing the front end of the ejected recording medium in the transport direction from striking the rear end of the ejected recording medium in the transport direction ;
On the other hand, when the movable member is displaced into the first position from the second position, the image forming apparatus characterized by the newly discharged recording medium is Ru is prevented from being caught in the movable member. The image forming apparatus according to claim 1, wherein the movable body is configured to be displaced in a direction accompanied by a downward movement when the movable body is displaced from the first position to the second position. A plurality of sets of curl suppression means each including the movable body are provided, and at least one set of the curl suppression means can be operated according to the size of the recording medium discharged from the discharge means. The image forming apparatus according to claim 1, wherein the image forming apparatus is configured. The discharge means has a roller through which the recording medium to be discharged passes above,
The image forming apparatus according to claim 1, wherein the movable body is disposed below an upper limit position reached by an outer peripheral surface of the roller. The image forming apparatus according to claim 4, wherein the movable body is disposed above a lower limit position reached by an outer peripheral surface of the roller.

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