JP2001039545A - Paper feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feed device having a large capacity and a stable paper feed function. SOLUTION: A paper feed device is composed of a paper feed tray 10 removably mounted on a printer 30, and a paper push-up panel 12 for pushing up sheets set in the mounted paper feed tray 10 toward a paper feed roller 32 through its rotation. When the paper feed tray 10 is unloaded, the paper push-up panel 12 is left to be set in the paper feed tray 10. When the paper feed tray 10 is loaded, the paper push-up panel 12 has its rotary fulcrum 14 located on the paper feed tray 10 while it extends from the rotary fulcrum 14 to a position around the paper feed roller 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeder used for an image forming apparatus such as a copying machine, a printer, a facsimile and the like.

[0002]

2. Description of the Related Art Conventionally, in the field of an image forming apparatus, a sheet feeding tray can be detachably attached to an image forming apparatus main body or can be opened and closed, and when not in use, the sheet feeding tray is detached or closed. Techniques for reducing the occupied area of the device have been proposed.

[0003]

However, in the above-described conventional image forming apparatus, a sheet feeding push-up plate which pushes up the sheets stacked and stored in the sheet feeding tray to the position of the sheet feeding roller by a rotating operation is provided in the image forming apparatus. Since the provided fulcrum is provided in the apparatus main body and the rotation fulcrum of the paper feed push-up plate is provided, the length of the paper feed push-up plate is reduced and shortened in the downsized apparatus main body. As a result, when the paper tray is full of paper and when the paper is low, the angle difference between the paper feed push-up plates becomes large, it is difficult to set the paper feed pressure to a constant value, and the paper is fed to the paper feed roller. Since the difference in the rush angle is large, there is a problem that the sheet feeding performance is not stable, and it has been difficult to increase the sheet feeding capacity.

Accordingly, the present invention provides a large-capacity paper feed tray with a large capacity by extending the paper feed push-up plate and making its rotation fulcrum farther even in a detachable or openable paper feed tray. It is an object of the present invention to provide a paper feeding device.

[0005]

According to a first aspect of the present invention, there is provided a sheet feeding apparatus including a sheet feeding tray detachably mounted on an image forming apparatus, and a sheet tray mounted and accommodated in the mounted sheet feeding tray. A sheet feeding push-up plate that pushes the recording medium toward the sheet feeding means by a rotating operation, wherein the sheet feeding push-up plate is in a first state stored in the sheet feeding tray or the image forming apparatus when the sheet feeding tray is not mounted. Wherein, when the paper feed tray is mounted, the paper feed push-up plate has a rotation fulcrum on the paper feed tray and is in a second state extending from the rotation fulcrum to the vicinity of the paper feeding means. I do.

In the paper feeder of the present invention, the paper feed push-up plate may be attached to the paper feed tray. In this case, the paper feed push-up plate may be retracted into the paper feed tray in the first state, and may protrude from the paper feed tray in the second state. It may be slidable with respect to the paper feed tray, or may be expandable and contractible by folding.

In the paper feeder of the present invention, the paper feed push-up plate may be extendable and retractable and may be mounted in the image forming apparatus.

According to another aspect of the present invention, there is provided a sheet feeding tray which is provided in the image forming apparatus so as to be openable and closable, and which is provided in the image forming apparatus and loaded and accommodated in the opened sheet feeding tray. A paper feed push-up plate that pushes up the recording medium by a rotating operation toward a paper feed unit, wherein the paper feed push-up plate has a rotation fulcrum on the paper feed tray and is expandable and contractable, and the paper feed tray is The paper feed tray is in a contracted state when closed, and is in an extended state when the paper feed tray is opened.

[0009]

According to the paper feeding device of the present invention, when the paper feeding tray is mounted, the paper feeding push-up plate has a rotation fulcrum on the paper feeding tray and extends from the rotation fulcrum to the vicinity of the paper feeding means. In this state, the rotation fulcrum of the feed push-up plate can be set farther than in the conventional image forming apparatus described above, and the feed push-up plate can be made longer. As a result, the angle difference between the paper feed push-up plate when the recording medium is fully loaded and when the paper medium is low is reduced, the paper supply pressure is easily set to be constant, and the difference in the angle at which the recording medium enters the paper supply means is also reduced. Therefore, the sheet feeding performance is stabilized, and the capacity of the sheet feeding tray can be increased. On the other hand, when the paper feed tray is not mounted, the paper feed push-up plate is in the first state accommodated in the paper feed tray or the image forming apparatus. Can be stored.

According to the paper feeding device of another aspect of the present invention, the paper feeding push-up plate has a rotation fulcrum on the paper feeding tray and expands and contracts in conjunction with opening and closing of the paper feeding tray. As compared with the above-described conventional image forming apparatus, the rotation fulcrum of the sheet feeding push-up plate can be set farther and the sheet feeding push-up plate can be lengthened. As a result, the angle difference between the paper feed push-up plate when the recording medium is fully loaded and when the paper medium is low is reduced, the paper supply pressure is easily set to be constant, and the difference in the angle at which the recording medium enters the paper supply means is also reduced. Therefore, the sheet feeding performance is stabilized, and the capacity of the sheet feeding tray can be increased. On the other hand, when the sheet feeding tray is closed, the sheet feeding push-up plate is in a contracted state, so that the sheet feeding push-up plate can be compactly stored in the image forming apparatus when not in use.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described. As shown in FIGS. 1 and 2, the paper feed tray 10 is detachable from the printer 30 which is an image forming apparatus. When used, the paper feed tray 10 is attached to the lower side of the printer 30 as shown in FIG. When used, it is detached from the printer 30 as shown in FIG.

A paper feed push-up plate 12 is mounted on the paper feed tray 10. The paper feed push-up plate 12 is
1 is retracted into the paper feed tray 10 as shown in FIG. 1 when it is not mounted, and is projected from the paper feed tray 10 into the printer 30 as shown in FIG. . The feeding push-up plate 12 in the protruding state is rotatable about a rotation fulcrum 14 held on the paper feeding tray 10, and is rotatable about the rotation fulcrum 14.
To the vicinity of a paper feed roller 32 serving as a paper feed unit. The paper feeding means is not limited to the roller type, but may be a belt type.

Sheets (not shown), which are recording media, are stacked and accommodated in the paper feed tray 10 in a state of being mounted on the printer 30. The loaded sheets are placed on the paper feed push-up plate 12 protruding from the paper feed tray 10, and the paper feed push-up plate 12 rotates about the rotation fulcrum 14 by pushing up a lever 34 provided at the lower part of the printer 30. Then, the leading edge of the stacked uppermost sheet is pressed against the sheet feeding roller 32, and the sheet can be fed.

In this state, the uppermost sheet is fed into the printer 30 by rotating the sheet feed roller 32 together with the transport roller 36. Thereafter, the paper is transferred to the printer 3 along a transport path 40 formed by a guide 38 or the like.
It is transported inside 0. In the transport process, the sheet passes through a nip between the photosensitive drum 42 and the transfer roller 44. During this passage, an electrostatic latent image is formed on the photosensitive drum 42 by exposure from the print head 46, and the toner contained in the imaging cartridge 48 adheres to the electrostatic latent image to form a toner image. The toner image is transferred to a sheet. Then, after the toner image is fixed when the sheet passes through the fixing roller pair 50, the sheet is discharged onto the discharge tray 54 via the discharge roller pair 52.

Next, the paper feed tray 10 and the paper feed push-up plate 12 will be described in detail. As shown in FIG. 3, the paper feed push-up plate 12 is formed of a U-shaped plate member, and a rotation fulcrum 14 is fixed to both ends of the plate. Slits 16 are formed in the vicinity of the rotation fulcrum 14, respectively, so that the mounting portion 12a of the rotation fulcrum 14 can be bent inward and deformed.

As shown in FIG. 4, the paper feed tray 10
A first holding hole 18 and a second holding hole 20 are respectively formed on both sides. When the paper tray 10 is not mounted,
As shown in FIG. 4A, the rotation fulcrum 1
4 is engaged with the first holding hole 18 of the paper feed tray 10, whereby the paper feed push-up plate 12 is stored in the paper feed tray 10. On the other hand, when the paper feed tray 10 is mounted on the printer 30, as shown in FIG.
Is pulled out from the paper feed tray 10 in the direction of the arrow 22. At this time, the rotation fulcrum 14 is detached from the first holding hole 18 by the elastic deformation of the mounting portion 12a of the rotation fulcrum 14 inward. When the rotation fulcrum 14 slides and reaches the position of the second holding hole 20, the rotation fulcrum 14 engages with the second holding hole 20 as shown in FIG. The push-up plate 12 is held so as to protrude from the paper feed tray 10. In this protruding state, as described above, the paper feed push-up plate 12 rotates about the rotation fulcrum 14, thereby pushing up the paper stacked thereon.

On the contrary, when the paper feed tray 10 is removed from the printer 30, the state shown in FIG.
The paper feed push-up plate 12 is pushed into the state shown in FIG. 2A and slid, whereby the paper feed push-up plate 12 is retracted and accommodated in the paper feed tray 10.

If the sheet feeding push-up plate 12 is slidable with respect to the sheet feeding tray 10, held at the storage position and the projecting position, and is rotatable at the projecting position, The shape and holding mechanism of 12 are not limited to those described above, and all known techniques can be applied. Alternatively, the paper feed push-up plate 12 may not be held at the storage position.

As described above, according to the paper feed tray 10 and the paper feed push-up plate 12 of the first embodiment, when the paper feed tray 10 is mounted, the paper feed push-up plate 12 is placed on the paper feed tray 10 by a rotation fulcrum. 14 and extends from the rotation fulcrum 14 to the vicinity of the paper feed roller 32, the rotation fulcrum 14 of the paper feed push-up plate 12 can be set farther than in the conventional image forming apparatus described above. In addition, the feed push-up plate 12 can be lengthened. As a result, the angle difference between the paper feed push-up plate 12 when the paper is fully loaded and when the paper is low becomes small, it becomes easy to set the paper supply pressure to be constant, and the difference in the angle at which the paper enters the paper feed roller 32 is also small. Therefore, the sheet feeding performance is stabilized, and the capacity of the sheet feeding tray 10 can be increased. On the other hand, when the paper feed tray 10 is not mounted, the paper feed push-up plate 12 is housed in the paper feed tray 10, so that the paper feed push-up plate 12 can be compactly stored in the paper feed tray 10 when not in use.

Next, a second embodiment will be described with reference to FIGS. Since the configuration and the image forming operation of the printer 30 are the same as those of the first embodiment, the same reference numerals are given to the same members, and the description will be omitted.

The paper feed push-up plate 62 of the second embodiment is rotatably attached to the paper feed tray 60 at a rotation fulcrum 64. The paper feed push-up plate 62 is made up of the first push-up plate 62a and the second push-up plate 62a.
The push-up plate 62b is rotatably connected to each other at a connection portion 66, so that the feed push-up plate 62 can be expanded or contracted by being folded or extended.

When the paper feed tray 60 is not mounted on the printer 30, the paper feed push-up plate 62 is folded and retracted into the paper feed tray 60 as shown in FIGS. And the paper tray 6
0.

On the other hand, when the paper feed tray 60 is mounted on the printer 30, as shown in FIG. 7B, the first push-up plate 62a is lifted in the direction of arrow 68 and the second push-up plate 62b is opened in the direction of arrow 70. Then, as shown in FIG. 7C, the paper feed push-up plate 62 is extended. As a result, the feeding push-up plate 62
Is in a state protruding from the paper feed tray 60. At this time, in the connecting portion 66, as shown in FIG. 8, the first push-up plate 62a and the second push-up plate 62b are regulated by the connecting member 72 so as to form a predetermined angle (for example, 180 °). With the feed push-up plate 62 extended in this manner, the feed tray 60
Is mounted on the printer 30 as shown in FIG. At this time, the feed push-up plate 62 is moved from the rotation fulcrum 64 to the feed roller 32.
Is extended to the vicinity of the paper feed push-up plate 62 by being pushed up by the lever 34 in this state.
4, the leading edge of the uppermost sheet stacked on the sheet feeding push-up plate 62 is pressed against the sheet feeding roller 32, and the sheet can be fed.

On the contrary, when the paper feed tray 60 is removed from the printer 30, the state shown in FIG.
The paper feed push-up plate 62 is folded to the state shown in FIG. As a result, the paper feed push-up plate 62 is stored in the paper feed tray 60.

As described above, the same effects as those of the first embodiment can also be obtained by the paper feed tray 60 and the paper feed push-up plate 62 of the second embodiment.

Next, a third embodiment will be described with reference to FIGS. As shown in FIG. 9, the paper feed tray 80 of the third embodiment detachably mounted on the printer 30 has a fulcrum holding portion 82 formed of a concave portion at the bottom thereof.

The paper feed push-up plate 84 is mounted inside the printer 30. Guide pins 86 are provided on both sides of the end portion of the paper feed push-up plate 84, respectively.
Are engaged with a guide groove 56 formed in the printer 30 and are movable in the groove. When the paper feed tray 80 is not mounted, the paper feed push-up plate 84 is in a contracted state and the printer 3
0.

On the other hand, when the paper feed tray 80 is mounted,
As shown in FIG. 0, the feed push-up plate 84 is in an extended state.
A rotation fulcrum 84 c formed of a protrusion with a rounded tip is formed at the end opposite to the guide pin 86 on the paper feed push-up plate 84. When the paper feed push-up plate 84 is in an extended state, the end of the paper feed push-up plate 84 protrudes from the printer 30 and the rotation fulcrum 84c engages with the fulcrum holding portion 82 of the paper feed tray 80. . As a result, the paper push-up plate 84, which is pushed up by the urging means (not shown) provided in the printer 30 and extends from the rotation fulcrum 84 c to the vicinity of the paper feed roller 32, is placed on the paper feed tray 80. It can rotate around the rotation fulcrum 84c.

Since the other configuration and image forming operation of the printer 30 are the same as those described in the first embodiment, the same reference numerals are given to the same members, and the description will be omitted.

Next, the configuration of the feed push-up plate 84 will be described. 11 and 12 are perspective views of the feed push-up plate 84 as viewed from the back. The paper feed push-up plate 84 is a first push-up plate 84a.
And a second push-up plate 84b. The rotation fulcrum 84c is formed at an end of the first push-up plate 84a.
The guide pin 86 is provided at an end of 4b. Also,
Two projections 88 are formed on the first push-up plate 84a, and two projections 88 are formed on the second push-up plate 84b in correspondence with the projections 88.
Two parallel long holes 89 are formed. The protrusion 88
Of the first push-up plate 8
4a and the second push-up plate 84b are slidably combined with each other. FIG. 12A shows a state in which the paper feed push-up plate 84 is contracted, and FIG. 12B shows a state in which the paper feed push-up plate 84 is expanded.

In the present embodiment, the sheet feeding push-up plate 84 is constituted by the two members 84a and 84b which can slide with respect to each other. The method of engagement between them is not limited.

As described above, according to the paper feed tray 80 and the paper feed push-up plate 84 of the third embodiment, when the paper feed tray 80 is mounted, the paper feed push-up plate 84 is placed on the paper feed tray 80 by the rotation fulcrum. Since it has the position 84c and extends from the rotation fulcrum 84c to the vicinity of the paper feed roller 32, the rotation fulcrum 84c of the paper feed push-up plate 84 can be set farther than in the conventional image forming apparatus described above. In addition, the feeding push-up plate 84 can be lengthened. As a result, the angle difference between the paper feed push-up plate 84 when the paper is fully loaded and when the paper is low is reduced, the paper feed pressure is easily set to be constant, and the difference in the angle at which the paper enters the paper feed roller 32 is also reduced. Therefore, the sheet feeding performance is stabilized and the capacity of the sheet feeding tray 80 can be increased. On the other hand, when the paper feed tray 80 is not mounted, the paper feed push-up plate 84 is housed in the printer 30, so that the paper feed push-up plate 12 can be compactly stored in the printer 30 when not in use.

Next, a modification of the third embodiment will be described. In the third embodiment, the feed fulcrum plate 84 is held in an extended state by engaging the rotation fulcrum 84c with the concave fulcrum holding portion 82 of the paper feed tray 80.
The method of holding the sheet feeding push-up plate 84 in an extended state is not limited to this.

For example, as shown in FIG.
Lock portion 89a having a wider width at the end of long hole 89 of 4b
May be formed, and the feed push-up plate 84 may be held in an extended state by engaging the projection 88 with the lock portion 89a. In this case, it is not necessary to form the concave fulcrum holding portion 82 on the paper feed tray 80, and the rotation fulcrum 84c of the paper feed push-up plate 84 may be placed on a flat portion on the paper feed tray 80.

As shown in FIG. 14, for example, a pin-shaped rotation fulcrum 90 is provided on each of both ends of the first push-up plate 84a in place of the projection-shaped rotation fulcrum 84c. Slits 92 are formed, and the mounting portions of the rotation fulcrum 90 are elastically bent inward by the slits 92. On the other hand, as shown in FIG.
Are formed on both sides to rotatably engage with each other. As a result, as shown in FIG. 15A, the first push-up plate 84a of the feed push-up plate 84 is pushed into the feed tray 80 mounted on the printer 30, and as shown in FIG. The paper feed push-up plate 84 may be held in an extended state by engaging with the holding hole 83.

The same effects as those of the third embodiment can also be obtained by the above-described modifications.

Next, a fourth embodiment will be described with reference to FIGS. Paper feed tray 1 of the fourth embodiment
The reference numeral 00 is provided on the side of the printer 30 so as to be openable and closable, as shown in FIGS. A feed push-up plate 102 is provided inside the printer 30, and one end of the push-up plate 102 is rotatably connected to the feed tray 100 by a rotation fulcrum 103. A lever 104 for lifting the feed push-up plate 102 upward is disposed below the feed push-up plate 102. Since the other configuration and image forming operation of the printer 30 are the same as those of the first embodiment, the same reference numerals are given to the same members, and the description is omitted.

As shown in FIG. 18, the paper feed push-up plate 102 is composed of a first push-up plate 102a and a second push-up plate 102b.
3 are fixed respectively. Two protrusions 106 are formed on the first push-up plate 102a.
2b, two parallel long holes 108 corresponding to the protrusions 106 are formed. As shown in FIG. 19, the first push-up plate 102a and the second push-up plate 102b are combined so that the protrusion 106 is engaged with the long hole 108, so that the first push-up plate 102a and the second push-up plate 102b Are slidable relative to each other so that the paper feed push-up plate 102 can expand and contract.

The paper feed push-up plate 102 which can be extended and contracted in this manner.
Is in a contracted state when the paper feed tray 100 is closed as shown in FIG. On the other hand, when the paper feed tray 100 is opened, FIG.
As shown in FIG. 7, the protrusion 110 provided on the lower surface of the second push-up plate 102b engages with the lever 104 to restrict the movement of the second push-up plate 102b, whereby the first push-up plate 102a slides and feeds. The push-up plate 102 is in an extended state. In this state, the paper feed push-up plate 102 rotates about the rotation fulcrum 103 by being pushed up by the lever 104.
By this rotation operation, the leading edge of the uppermost sheet stacked and stored on the sheet feeding tray 100 and the sheet feeding push-up plate 102 is pressed against the sheet feeding roller 32 to be in a state in which the sheet can be fed.

As described above, according to the paper feed tray 100 and the paper feed push-up plate 102 of the fourth embodiment, the paper feed push-up plate 102 has the rotation fulcrum 103 on the paper feed tray 100 and the paper feed tray. Since it expands and contracts in conjunction with opening and closing of the sheet feeder 100, the rotation fulcrum 1 of the sheet feeder push-up plate 100 is different from the above-described conventional image forming apparatus.
03 can be made farther, and the paper feed push-up plate 102 can be made longer. As a result, the angle difference between the paper feed push-up plate 102 when the paper is fully loaded and when the paper is low becomes small, it is easy to set the paper supply pressure to be constant, and the difference in the angle at which the paper enters the paper feed roller 32 is also small. Therefore, the sheet feeding performance is stabilized, and the capacity of the sheet feeding tray 100 can be increased. on the other hand,
When the paper feed tray is closed, the paper feed push-up plate 102 is in a contracted state, so that the paper feed push-up plate 102 can be compactly stored in the printer 30 when not in use.

Next, a modification of the fourth embodiment will be described. In the fourth embodiment, the movement of the second push-up plate 102b is restricted by engaging the lever 104 with the projection 110 provided on the lower surface of the second push-up plate 102b.
As shown at 0 and 21, a guide pin 112 is provided at the end of the second push-up plate 102b, and the guide pin 112 is engaged with the guide groove 56 formed in the printer 30 so as to be slidable only in the vertical direction. , Paper feed tray 100
The movement of the second push-up plate 102b at the time of opening and closing may be restricted. In this case, the paper feed push-up plate 102 is pushed up by the urging means (not shown).

In the above-described embodiments and modifications, the case where the paper feed tray and the paper feed push-up plate of the present invention are applied to a printer has been described. However, the present invention is applicable to other image forming apparatuses such as a copying machine and a facsimile. Is also applicable.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a state in which a paper feed tray according to a first embodiment is removed from a printer.

FIG. 2 is a schematic configuration diagram illustrating a state in which the paper feed tray according to the first embodiment is mounted on a printer.

FIG. 3 is a perspective view of a sheet feeding push-up plate.

4A illustrates a state in which a sheet feeding push-up plate is accommodated in a sheet feeding tray, FIG. 4B illustrates a state in which the sheet feeding pushing-up plate is pulled out from the sheet feeding tray, and FIG. FIG. 5 is a diagram illustrating a state in which a push-up plate protrudes from a sheet feeding tray.

FIG. 5 is a schematic configuration diagram illustrating a state in which a paper feed tray according to a second embodiment is removed from a printer.

FIG. 6 is a schematic configuration diagram illustrating a state in which a paper feed tray according to a second embodiment is mounted on a printer.

7A illustrates a state in which the sheet feeding push-up plate is accommodated in the sheet feeding tray, FIG. 7B illustrates a state in which the sheet feeding push-up plate is pulled out, and FIG. The figure which shows the state which protruded from the tray.

FIG. 8 is an enlarged view of a connecting portion of a sheet feeding push-up plate.

FIG. 9 is a schematic configuration diagram illustrating a state in which a paper feed tray according to a third embodiment is removed from a printer.

FIG. 10 is a schematic configuration diagram illustrating a state in which a sheet feeding tray according to a third embodiment is mounted on a printer.

FIG. 11 is an exploded perspective view of a paper feed push-up plate.

12 (a) is a perspective view of a paper feed push-up plate in a contracted state, and FIG. 12 (b) is a perspective view of a paper feed push-up plate in an extended state.

FIG. 13 is a perspective view showing a modification of the sheet feeding push-up plate.

FIG. 14 is a perspective view showing another modification of the sheet feeding push-up plate.

FIG. 15 is a diagram illustrating a state in which the sheet feeding push-up plate of FIG. 14 is mounted on a sheet feeding tray.

FIG. 16 is a schematic configuration diagram illustrating a state in which a sheet feeding tray according to a fourth embodiment is closed.

FIG. 17 is a schematic configuration diagram illustrating a state in which a sheet feeding tray according to a fourth embodiment is opened.

FIG. 18 is an exploded perspective view of a sheet feeding push-up plate.

FIG. 19 is a perspective view of a sheet feeding push-up plate.

FIG. 20 is a schematic configuration diagram showing a modification of the fourth embodiment.

FIG. 21 is a schematic configuration diagram showing a modification of the fourth embodiment.

[Explanation of symbols]

10: paper feed tray, 12: paper feed push-up plate, 14: rotation fulcrum, 30: printer (image forming apparatus), 32: paper feed roller (paper feed means).

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F343 FA02 FB02 FB03 FB04 GA02 GB01 GC01 GD01 HA16 HA22 HA27 HA29 HB03 HC23 HC24 HC25 HC30 HD08 HD09 HD15 HD17 JA01 KB03 KB17 LA04 LA13 LA15 LC02 LC12 LC19 LD12

Claims (7)

[Claims] A sheet feeding tray detachably mounted on the image forming apparatus, a sheet feeding push-up plate for rotating a recording medium loaded on the mounted sheet feeding tray toward a sheet feeding means by a rotating operation; When the paper feed tray is not mounted, the paper feed push-up plate is in the first state accommodated in the paper feed tray or the image forming apparatus, and when the paper feed tray is mounted, the paper feed push-up plate is in the feed state. A sheet feeding device having a rotation fulcrum on a paper tray and in a second state extending from the rotation fulcrum to the vicinity of the sheet feeding means. 2. The sheet feeding device according to claim 1, wherein the sheet feeding push-up plate is attached to the sheet feeding tray. 3. The paper feeding push-up plate according to claim 2, wherein the paper feeding push-up plate is retracted into the paper feeding tray in the first state, and protrudes from the paper feeding tray in the second state. Paper feeder. 4. The paper feeding device according to claim 3, wherein the paper feeding push-up plate is slidable with respect to the paper feeding tray. 5. The sheet feeding device according to claim 3, wherein the sheet feeding push-up plate is made expandable and contractible by folding. 6. The sheet feeding device according to claim 1, wherein the sheet feeding push-up plate is extendable and retractable and is mounted in the image forming apparatus. 7. A sheet feeding tray provided in the image forming apparatus so as to be openable and closable, and a recording medium provided in the image forming apparatus and loaded and stored in the opened sheet feeding tray is directed to sheet feeding means. It has a paper feed push-up plate that pushes up by rotating operation,
The paper feed push-up plate has a rotation fulcrum on the paper supply tray and is extendable and contractible when the paper supply tray is closed, and expanded when the paper supply tray is opened. A sheet feeding device, comprising: