JPH07301959A - Double-sided unit for image forming device - Google Patents

Abstract

PURPOSE:To prevent the leading edge of a transfer paper from being folded when it is supplied again in a double-'sided unit provided with an elastic guide for improving the carrying property of the transfer paper. CONSTITUTION:A feeding roller 13 and a bottom plate moving means 11 moving a bottom plate 15 are driven by an identical motor 22 and rotational force is transmitted to the moving means 11 from the motor 22 through a reduction mechanism 23. When the transfer paper P fed to a double-sided tray 12 is supplied again, the direction of the tip of the elastic guide 14 is changed by moving the bottom plate 15 to an elevating position by the moving means 11 and rotating the roller 13 in an opposite direction to a direction shown by an arrow A before the paper P on the tray 12 is made to abut on the roller 13. Thus, since the paper P supplied again is naturally guided by the guide 14, the leading edge thereof is not folded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a copying machine, a printer,
Regarding a duplex unit of an image forming apparatus such as a facsimile,
In particular, the present invention relates to a double-sided unit having an elastic guide whose tip is brought into contact with a feed roller in order to improve the transportability of the transfer paper fed into and discharged from the double-sided unit.

[0002]

2. Description of the Related Art For example, some copying machines are equipped with a double-sided unit 1 used for forming images on both front and back sides of a transfer sheet as shown in FIG. The double-sided unit 1 includes a double-sided tray 2 on which a transfer sheet having an image formed on one side is stacked, a feed roller 3 rotatable in both forward and reverse directions, and a separation roller that rotates while contacting the feed roller 3. 6, an elastic guide 4 provided at its tip end to the feed roller 3 to be fed to the double-sided tray 2 and to improve the transportability of the transfer sheet P re-fed from the double-sided tray 2, It has a bottom plate 5 for bringing the transfer paper P on the double-sided tray 2 into contact with the feed roller 3 when the transfer paper P is sent out from the tray 2.

When the transfer paper P having an image formed on one surface thereof is stacked on the double-sided tray 2, the feed roller 3 rotates in the direction of the arrow shown by the solid line in FIG. 10 to function as a conveying roller. Then, the transfer sheets P conveyed thereby are sequentially stacked on the bottom plate 5 in the lower position in the double-sided tray 2. At this time, the tip end of the elastic guide 4 follows the rotational direction of the feed roller 3 and is oriented in the direction indicated by the solid line in the figure.

When the stack of the transfer paper P in the double-sided tray 2 is completed, the feed roller 3 rotates in the direction of the arrow indicated by the broken line, and this time the feed roller 3 functions as a paper feed roller and a separation roller. Further, the bottom plate 5 is rotated to the raised position shown by the phantom line in the figure, and the uppermost transfer sheet P stacked thereon is brought into contact with the feed roller 3.

Therefore, the uppermost transfer sheet P is re-fed while being separated into one sheet. At this time, the elastic guide 4
The tip follows the direction of rotation of the feed roller 3,
The direction changes as shown by the virtual line.

[0006]

However, in the case of the double-sided unit having the elastic guide whose tip abuts on the outer peripheral surface of the feed roller as described above, the feed roller is reversely rotated after the transfer sheets are stacked in the double-sided tray. This may cause inconvenience when re-feeding the transfer paper.
That is, as shown in FIG. 10, after the transfer sheets P are stacked in the double-sided tray 2, the elastic guide 4 has its tip shown by a solid line in the figure along the direction in which the feed roller 3 was rotating. It is facing (to the left).

In this state, at the time of re-feeding, the bottom plate 5 moves to the raised position shown by the phantom line in the figure, so that the leading end of the transfer sheet P located at the uppermost position abuts on the feed roller 3.
It is pressed with a pressing force suitable for paper feeding. Therefore,
In this state, the leading end of the elastic guide 4 and the leading end of the transfer paper P both come into contact with the feed roller 3.

In this state, when the feed roller 3 is reversely rotated in the direction of the arrow indicated by the broken line for re-feeding, as shown in FIG. 11, the elastic guide 4 and the transfer sheet P which are in contact with the feed roller 3 together. Are simultaneously moved to the right in the figure, the leading edge of the transfer paper P curls as shown in FIG.
When the paper was fed to the separation position where the separation roller 6 was provided, it was sometimes pinched by the gripping and the tip was broken.

When the width of the elastic guide 4 is formed so as to substantially correspond to the roller width of the feed roller 3 as shown in FIG. 13, for example, this tip bending is a portion corresponding to the width of the elastic guide 4. Occurrence occurs, and as a result, it causes a conveyance jam, or even if the jam does not occur, the tip Pa is broken
There was a problem because the image was not transferred to.

The present invention has been made in view of the above problems, and has a case in which an elastic guide having its tip abutted against a feed roller is provided in order to improve the transportability of a transfer sheet. Also, the purpose is to prevent the tip of the transfer paper from being broken.

[0011]

In order to achieve the above-mentioned object, the present invention, in a double-sided unit of an image forming apparatus as described above, moves a bottom plate by a bottom-plate moving means when feeding a transfer sheet from a double-sided tray. By this means, before the transfer paper on the double-sided tray comes into contact with the feed roller, there is provided a means for rotating the feed roller in the second direction to change the direction of the tip of the elastic guide to the direction corresponding to the second direction. It is a thing.

In the double-sided unit of the image forming apparatus, the feed roller and the bottom plate moving means are driven by the same driving source, and the bottom plate moving means transmits the rotational force from the driving source through the speed reducing mechanism. When the drive source rotates the feed roller in the second direction, the bottom plate moving means is actuated via the speed reduction mechanism to move the bottom plate with a delay to the ascending position. .

[0013]

According to the double-sided unit of the image forming apparatus having the above-described structure, when the transfer paper fed to the double-sided tray is re-fed, the bottom plate is moved to the raised position by the bottom plate moving means and the double-sided tray is placed. Before the transfer paper is brought into contact with the feed roller, the feed roller is rotated in the second direction for feeding the transfer paper from the double-sided tray to change the direction of the tip of the elastic guide to the direction corresponding to the second direction. Therefore, the transfer paper delivered from the double-sided tray is re-fed while being guided by the elastic guide without difficulty. Therefore, the leading edge of the re-fed transfer sheet does not break.

Further, the feed roller and the bottom plate moving means are driven by the same drive source, and the rotational force from the drive source is transmitted to the bottom plate moving means via the speed reducing mechanism. When the feed roller is rotated in the second direction, the bottom plate moving means is actuated via the speed reduction mechanism so that the bottom plate is moved to the raised position with a delay, so that the speed reduction ratio of the speed reduction mechanism is increased. With such a simple mechanism, the feed roller can be rotated in the second direction before the transfer paper on the double-sided tray comes into contact with the feed roller. Therefore, there is no need to perform any timing control or the like.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a duplex unit of an image forming apparatus showing an embodiment of the present invention. A double-sided unit 10 of this image forming apparatus includes a double-sided tray 12 having a movable bottom plate 15 on which a transfer sheet P having an image formed thereon is stacked, and a first portion indicated by an arrow A for feeding the transfer sheet P to the double-sided tray 12. 1 and the double-sided tray 12 from the transfer paper P
And a feed roller 13 that is rotatable in a second direction opposite to the arrow A that sends out.

Further, the leading end of the feed roller 13 is in contact with the feed roller 13, the direction of the leading end can be changed to the direction corresponding to the first or second direction according to the rotation direction of the feed roller 13, and the double-sided tray. When the transfer sheet P is fed from the sheet 12, the transfer sheet P on the double-sided tray 12 is brought into contact with the feed roller 13, and the bottom plate 15 is rotated about a fulcrum 21 to a raised position shown by an imaginary line in FIG. And means 11.

Further, the double-sided unit 10 moves the transfer paper P fed by the feed roller 13 and the separation roller 42 pressed against the double-sided tray 12 to rotate toward and away from each other in the front and back directions in FIG. By repeating the (jogging operation), a pair of side fences (not shown) that align the positions in the paper width direction with respect to the paper feed direction, and the front end of the transfer paper P fed onto the double-sided tray 12 (becomes the rear end when re-fed). 1) in which the positions of () are aligned with each other.

As shown in FIG. 2, the feed roller 13 is attached to the feed roller shaft 16 by an attachment method described later so as to come into contact with the vicinity of the conveyance center of the transfer sheet P to be fed with a predetermined width.

The elastic guide 14 is formed of, for example, a flexible resinous film material, and has a width substantially corresponding to the length of the feed roller 13 in the axial direction. The entire area of the tip is the feed roller 13.
The roller surface is in contact with the roller surface with a contact pressure that does not hinder the rotation of the feed roller 13 due to the elastic force of the material itself.

In this double-sided unit, when the transfer sheet P is sent out from the double-sided tray 12 of FIG. 1, the transfer sheet P on the double-sided tray 12 is moved by the bottom plate moving means 11 rotating the bottom plate 15 upward. Before coming into contact with the feed roller 13, the feed roller 13 is rotated in a second direction opposite to the arrow A so that the tip of the elastic guide 14 is oriented in the second direction.
It is operated so as to be changed to the direction corresponding to the direction (the tip is directed to the right in FIG. 1).

FIG. 3 is a perspective view showing a mechanism for operating the feed roller 13 and the bottom plate 15 as described above. This mechanism drives the feed roller 13 and the bottom plate moving means 11 by a motor 22 which is the same drive source. The bottom plate moving means 11 applies a rotational force from the motor 22 to the speed reduction mechanism 23.
To the lever holding shaft 39, and the pressure lever 37 fixed thereto is rotated to rotate the bottom plate 15 around the fulcrum 21 (FIG. 1).

When the motor 22 is rotated to rotate the feed roller 13 in the second direction indicated by the arrow B, the bottom plate moving means 11 is operated via the speed reduction mechanism 23 and the bottom plate 15 is moved.
Is moved by the deceleration mechanism 23 to the rising position (the position changes depending on the number of stacked transfer sheets on the bottom plate 15) shown in phantom in FIG.

The reduction mechanism 23 is composed of a large number of gears arranged in a train of wheels as shown in FIG. 3, and has a drive gear 24 fixed to the rotating shaft of the motor 22 and a large gear of the first idle gear 25. The diameter portion meshes with the small diameter portion of the first idle gear 25, and the large diameter portion of the second idle gear 26 meshes with the small diameter portion.

Furthermore, a third idle gear 27 meshes with the small diameter portion of the second idle gear 26, and an input gear 28 meshes with the third idle gear 27. A gear 31 for sequentially transmitting the rotational force from the motor 22 to another drive system is meshed with the input gear 28, and gears 32 and 33 are sequentially meshed with it.

A cam 29 is attached to the input gear 28 via a clutch 30 that idles when a predetermined load or more is applied, and a pin 34 is attached to the cam 29 at a position eccentric from the rotation center. , One end of a pressure spring 35 is attached to the pin 34.

The other end of the pressure spring 35 is attached to an arm 36 fixed to one end of a lever holding shaft 39 rotatably held by a fixed portion of the duplex unit. The lever holding shaft 39 fixes one end of a pressure lever 37 for rotating the bottom plate 15 at a position substantially corresponding to the center of conveyance of the transfer paper.

On the other hand, a roller driving gear 38 is meshed with the small diameter portion of the second idle gear 26, and the roller driving gear 38 is attached to one end of the feed roller shaft 16 rotatably held by the fixed portion of the duplex unit. It ’s fixed,
The feed roller 13 is attached to the feed roller shaft 16 by an attaching method described later.

The image forming apparatus having the double-sided unit 10 shown in FIG. 1 configured as described above is illustrated when the double-sided image forming mode for forming images on both sides of the transfer sheet is selected and the image forming operation is started. A toner image is formed on one surface of the transfer paper P by the image forming unit, and the toner image is conveyed to the fixing unit 17 in an unfixed state, and the toner image is fixed there.

The transfer sheet P is reversed by the branching claw 18 which is switched to the position shown by the phantom line in FIG.
Is conveyed to the horizontal conveyance path 41 in the duplex unit 10.
Then, it is fed onto the double-sided tray 12 by the feeding force of the feed roller 13 and the separation roller 42. Immediately after the transfer paper P is fed onto the double-sided tray 12, a side fence and an end fence 43 (not shown)
The front, rear, left and right positions are aligned. Then, in the case of forming a double-sided image on a plurality of sheets, this series of operations is repeated.

In this way, when all of the designated number of sheets are stacked on the double-sided tray 12, the bottom plate 15 rotates the transfer paper P on the double-sided tray 12 in the direction opposite to the arrow A in FIG. The feed roller 13 is rotated to a raised position indicated by an imaginary line. As a result, the transfer paper P is sequentially re-fed from the topmost one.

This re-feeding is performed with the transfer paper P on the double-sided tray 12 being aligned by the pair of side fences and end fences 43 in the front-rear and left-right positions. It doesn't become.

The rotating operation of the bottom plate 15 and the rotational driving of the feed roller 13 are performed by the same motor 22 as described with reference to FIG. 3, and the rotating operation of the bottom plate 15 is performed by the reduction mechanism 23. Is the feed roller 1
As described above, when 3 is rotated in the sheet re-feeding direction (second direction) indicated by the arrow B, the bottom plate 15 moves to the raised position later.

That is, in the duplex unit 10 according to this embodiment, the feed roller 13 rotates in the direction opposite to the arrow B by the motor 22 rotating in the arrow C direction in FIG. When it is stacked on the tray 12, its motor 22 is rotated in the direction opposite to the arrow C, and the re-feed operation is started.

As a result, the drive gear 24 rotates clockwise in FIG. 3, and the first idle gear 2 meshing with the drive gear 24 meshes therewith.
5 rotates counterclockwise. Further, the rotational force is transmitted to the roller drive gear 38 via the second idle gear 26, and the feed roller 13 rotates in the direction of arrow B via the feed roller shaft 16 integrated with the roller drive gear 38.

A third idle gear 27 is also meshed with the second idle gear 26, and an input gear 28 having a cam 29 for rotating the bottom plate 15 is meshed with the third idle gear 27. Therefore, the input gear 28 simultaneously rotates in the clockwise direction in FIG.

The rotation speed of the input gear 28 is slower than that of the roller drive gear 38 because the speed reduction ratio of the speed reduction mechanism 23 is increased by increasing the number of teeth of the input gear 28. Therefore, the input gear 28 rotates slowly with respect to the rotation of the roller drive gear 38, and the cam 29 rotates in the arrow E direction from the position shown in FIG. 4 at the rotation speed thereof.

Abutment portions 29a and 29b are formed on the outer periphery of the cam 29 at positions different from each other by 180 ° in phase, and when the cam 29 rotates in the direction E, as shown in FIG. When the contact portion 29b contacts the stopper 45, further rotation of the cam 29 is restricted.

After that, the input gear 28 continues to rotate in the clockwise direction in FIG. 3, but the rotation of the input gear 28 idles at the portion of the clutch 30 mounted between the input gear 28 and the cam 29. 29 is stopped. In this way, when the cam 29 rotates to the position shown in FIG. 5, the pin 34 attached to the cam 29 becomes the position farthest from the bottom plate 15, so that the pressure spring 35 moves the pressure arm 36 in the arrow direction. Rotate in the F direction.

Therefore, since the lever holding shaft 39 rotates in the same direction and the pressure lever 37 fixed thereto rotates in the same direction, the bottom plate 15 is rotated by the pressure lever 37.
Is rotated to the ascending side, and the uppermost one of the transfer sheets stacked on the bottom plate 15 is moved to the ascending position shown in phantom in FIG. The movement of the bottom plate 15 to the raised position is caused by the reduction mechanism 23.
As a result, the feed roller 13 is delayed from the timing at which the feed roller 13 starts rotating in the direction opposite to the arrow A in FIG.

Therefore, the elastic guide 14 is used for the transfer paper P.
After stacking on the double-sided tray 12, feed roller 1
3 is oriented along the direction in which it was rotating (the tip is directed to the left in FIG. 1), the bottom plate 15 is lifted during re-feeding in that direction so that the transfer sheet hits the feed roller 13. When the sheets are contacted and re-fed, there is a case where the leading edge of the transfer sheet is likely to occur as described with reference to FIGS. 11 to 13. However, according to this embodiment, it can be prevented.

That is, in this embodiment, the double-sided tray 1
When re-feeding the transfer paper P sent to the paper 2, the bottom plate moving means 11 moves the bottom plate 15 to the ascending position to bring the transfer paper on the double-sided tray 12 into contact with the feed roller 13. Feed roller 13 to double-sided tray 12
The direction of the tip of the elastic guide 14 is changed to the transfer paper sending side (the direction corresponding to the second direction) by rotating the transfer paper in the direction opposite to the arrow A in FIG. The transfer sheet P sent out is re-fed while being guided naturally by the elastic guide 14 whose direction is changed.

Therefore, the leading end of the re-fed transfer paper P is not bent. When the cam 29 is rotated counterclockwise from the position shown in FIG. 5 to the position shown in FIG. 4, the pressing lever 37 is rotated clockwise in the figure by a weak spring whose biasing force is not shown. Being energized,
The urging force returns to the position shown, and the bottom plate also returns to the position shown by its own weight.

By the way, in this embodiment, when a paper jam (jam) occurs in the feed roller 13,
The transfer paper can be easily taken out without breaking it.

The structure and operation will be described below with reference to FIGS. 6 to 9. As shown in FIGS. 6 and 7, the feed roller 13 is formed with a central hole 47 into which the feed roller shaft 16 is rotatably fitted in the axial direction. The hub groove 47a is formed within a range of a predetermined angle in the direction. Its hub groove 47a
Has the diameter of the groove larger than the diameter of the center hole 47, but the hub walls 47b and 47c (see also FIG. 8) are formed by making part of the diameter the same as the diameter of the center hole 47. .

The feed roller shaft 16 has a pin 48.
When the feed roller shaft 16 is fitted into the center hole 47 of the feed roller 13,
8 rotates in the hub groove 47a within a predetermined angle range where it abuts the hub walls 47b and 47c.

Then, in this way, the feed roller shaft 16
7 in the center hole 47 of the feed roller 13, the C-shaped grooves 16a and 16b are, for example, C-shaped as shown in FIG.
A retaining member 49, 5 such as a ring or an E ring
0 is inserted so that the feed roller 13 does not shift in the axial direction with respect to the feed roller shaft 16 in the assembled state.

Since the feed roller 13 is attached to the feed roller shaft 16 with such a configuration, the hub groove 47a and the pin 48 of the feed roller shaft 16 of the feed roller 13 have a positional relationship as shown in FIG. when,
As shown in FIG. 9, the pin 48 is attached to the hub wall 47c in the direction of arrow B.
Can freely rotate (idle) relative to the feed roller shaft 16 until it comes into contact with.

Therefore, when the feed roller and the feed roller shaft are directly connected to each other, when a paper jam occurs at the feed roller portion and when the transfer paper is to be pulled out and taken out, a drive including a motor is performed via the feed roller. Was it easy to break the transfer paper because of the large amount of force required to rotate the system?
According to this embodiment, since the feed roller 13 is provided with the relative rotation area with respect to the feed roller shaft 16 as described above, only the feed roller 13 is freely rotated within the rotatable range, and the transfer in which the paper jam occurs is generated. You can remove the paper.

When the transfer paper is stacked on the double-sided tray 12, the feed roller shaft 16 rotates in the direction of arrow A while the pin 48 contacts the hub wall 47c as shown in FIG. When the feed roller 13 rotates in the same direction and the transfer paper is re-fed, the pin 48 contacts the hub wall 47b and rotates in the arrow B direction as shown in FIG. Rotate in the direction.

When the feed roller shaft 16 changes its rotation direction from the rotation in the stack direction to the rotation in the sheet re-feeding direction (or vice versa), only the feed roller shaft 16 rotates to feed the paper. The roller 13 has an idling area (a range of a predetermined angle in which the hub groove 47a is formed) in which the roller 13 does not rotate. However, if the idling area is reduced, an elastic guide for re-feeding the transfer paper after stacking is completed. 1
The direction of the tip of 4 can be changed more quickly.

Even if the idling area is provided as described above,
By increasing the number of teeth of the input gear 28 of the speed reduction mechanism 23 described in the above, and increasing the speed reduction ratio, the movement of the bottom plate 15 to the raised position (the position shown by the phantom line in FIG. 1) can be delayed. , The transfer paper on the double-sided tray 12 is the feed roller 1
The feed roller 13 can be rotated in the direction of the arrow B before contacting the sheet 3 to change the direction of the tip of the elastic guide 14 (FIG. 2).

As described above, in this embodiment, the operation of rotating the feed roller 13 before moving the bottom plate 15 to the raised position and bringing the transfer sheet into contact with the feed roller 13 at the time of re-feeding is performed. Although it has been realized by a simple mechanical mechanism that merely increases the reduction ratio of the reduction mechanism 23, it may be performed by timing control using a microcomputer or the like.

[0053]

As described above, according to the present invention, when the transfer paper sent to the double-sided tray is re-fed, the feed roller rotates in the second direction for sending out the transfer paper, and the elastic guide is provided. The transfer paper on the double-sided tray contacts the feed roller and is re-fed, after the direction of the front end of the transfer paper is changed to the direction corresponding to the second direction. Can be re-fed.

Further, if the feed roller and the bottom plate moving means are driven by the same drive source, and the rotational force from the drive source is transmitted to the bottom plate moving means via the reduction mechanism, the reduction mechanism It is possible to delay the contact of the transfer paper on the double-sided tray with the feed roller by a simple mechanism that only increases the speed reduction ratio of. Therefore, it is possible to prevent the leading edge of the transfer sheet re-fed from the double-sided tray only by the above-mentioned mechanism without using the control device for controlling the timing.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a duplex unit of an image forming apparatus according to an embodiment of the present invention together with a part of the image forming apparatus.

FIG. 2 is a feed roller 13 also provided in the double-sided unit and an elastic guide 14 having a tip portion in contact with the feed roller 13.
FIG.

3 is a perspective view showing a mechanism for driving a feed roller 13 and a bottom plate 15 of the double-sided unit shown in FIG.

FIG. 4 is a schematic view showing a state in which a cam 29 for rotating the bottom plate 15 is also in a rotating position when feeding a transfer sheet to a double-sided tray.

FIG. 5 is a schematic view showing a state in which the cam 29 is in a rotation position when the transfer sheet is sent out from the double-sided tray.

6 is a perspective view for explaining a mounting structure of the feed roller 13 to the feed roller shaft 16. FIG.

FIG. 7 is a vertical cross-sectional view showing a state in which the feed roller 13 is also assembled to the feed roller shaft 16.

FIG. 8 is a feed roller shaft 16 when re-feeding transfer paper.
FIG. 6 is a schematic diagram showing a positional relationship between the feed roller 13 and the feed roller 13 in the rotation direction.

FIG. 9 is a schematic view showing a positional relationship in the rotation direction between the feed roller shaft 16 and the feed roller 13 when the transfer sheets are stacked on the double-sided tray.

FIG. 10 is a schematic view showing an example of a duplex unit provided in a conventional copying machine.

FIG. 11 is a schematic view showing a state in which refeeding is started in a conventional duplex unit.

FIG. 12 is a schematic diagram for explaining a state in which the leading edge of the transfer sheet curls and is folded again after the sheet is re-fed.

FIG. 13 is a schematic view showing a state in which the tip bending is also generated in a width corresponding to the elastic guide.

[Explanation of symbols]

 10: Double-sided unit 11: Bottom plate moving means 12: Double-sided tray 13: Feed roller 14: Elastic guide 15: Bottom plate 22: Motor (driving source) 23: Reduction mechanism P: Transfer paper

Claims (2)

[Claims] 1. A double-sided tray having a movable bottom plate on which a transfer sheet having an image formed thereon is stacked, a first direction for feeding the transfer sheet to the double-sided tray, and a second direction for feeding the transfer sheet from the double-sided tray. And a tip of the feed roller that is rotatable with respect to the feed roller, and the direction of the tip is changed to a direction corresponding to the first or second direction according to the rotation direction of the feed roller. And a bottom plate moving unit that moves the bottom plate to a rising position for bringing the transfer paper on the double-sided tray into contact with the feed roller when the transfer paper is fed from the double-sided tray, When the transfer sheet is sent from the double-sided tray, before the transfer sheet on the double-sided tray comes into contact with the feed roller due to the movement of the bottom plate by the bottom plate moving means, Duplex unit of an image forming apparatus, wherein a is provided with means for changing the tip direction of the second of said rotated in a direction elastic guide in the direction corresponding to the second direction Idorora. 2. The double-sided unit of the image forming apparatus according to claim 1, wherein the feed roller and the bottom plate moving means are driven by the same drive source, and the bottom plate moving means has a reduction mechanism in which a rotational force from the drive source is reduced. And the drive source is configured to transfer the feed roller to the second roller.
The double-sided unit of the image forming apparatus, wherein the bottom plate moving means is actuated via the deceleration mechanism to move the bottom plate delayed to the raised position when rotated in the direction.