JPH07228367A - Paper feeding device of image forming apparatus - Google Patents

Abstract

PURPOSE:To provide a paper feeder for an image forming device whereby a paper feed roller can be easily changed by a user and further a newly mounted paper feed roller can be positioned in a proper position. CONSTITUTION:A paper feeder has a semicircular paper feed roller 5, and it is supported to a rotary shaft 6. A hole 11, in which a circular arc shape is combined with the other shape, is formed in the center of the paper feed roller 5, to form a sectional shape of the rotary shaft 6 in the same shape to the hole 11 of the paper feed roller 5, and when the rotary shaft 6 is fitted to the paper feed roller 5, a dimensional shape of interference fit is obtained to support the paper feed roller to the rotary shaft 6 by elastic force of the roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding roller for feeding a sheet placed on a sheet placing section formed in a half moon shape, and the sheet feeding roller is supported by a cantilevered rotating shaft. Has been
The present invention relates to a sheet feeding device of an image forming apparatus such as a copying machine and a printer.

[0002]

2. Description of the Related Art In a paper feeding device of the above type, a paper feeding roller may become dirty or worn due to use over time, which often causes abnormal feeding such as non-feeding. In a conventional copying machine or the like, a service person who carries out a periodical inspection checks the dirt condition and wear condition of the paper feed roller to determine whether it needs to be replaced. Also, in the case of personal equipment, if the number of paper feeding failures increases, the user has instructed to wipe the rollers with water. However, cleaning the paper feed roller is troublesome for the user. Therefore, Japanese Patent Laid-Open No. 60-248535 discloses that a paper feed unit is provided with a brush roller for removing paper dust. Surely, removing paper dust is also one way to extend the life of the paper feed roller, but the life of the roller is not limited to paper dust alone, and there are various stains that adhere to the surface of the roller. Need to keep However, since the paper feed roller is a consumable item even after such wiping with water, it must be replaced eventually.

[0003]

However, it is difficult for a general user to replace the paper feeding roller in the conventional paper feeding device, and it is necessary to request an expert.
However, in recent years, like toner and process kid,
It is desired that the user can easily replace the paper feed roller which is a consumable item.

In view of the above-mentioned conventional circumstances, the present invention provides a sheet feeding device of an image forming apparatus in which a user can easily replace the sheet feeding roller and position the newly mounted sheet feeding roller at a correct position. The purpose is to

[0005]

In order to achieve the above object, the present invention has a sheet feeding roller made of an elastic material for feeding a sheet placed on a sheet placing section and formed in a half-moon shape. In a paper feeding device of an image forming apparatus in which a paper roller is supported by a cantilever-shaped rotating shaft, a hole formed by combining an arc and another shape is formed at the center of the paper feeding roller, and a cross section of the rotating shaft is formed. The shape is formed in the same shape as the hole of the paper feed roller,
When the rotary shaft and the paper feed roller are fitted, the size and shape of the fit fit tightly and the elastic force of the roller supports the rotary shaft.

Further, in order to achieve the above-mentioned object, the present invention comprises a groove formed on the rotary shaft in the width of the paper feed roller,
When the paper feed roller is fitted to the rotary shaft, it is provided with means for positioning the paper feed roller in the circumferential direction.

Further, in order to achieve the above object, according to the present invention, a hole formed by combining an arc and another shape is formed at the center of the sheet feeding roller, and a convex portion directed inward is provided on the surface of the hole. The rotary shaft is formed to have the same cross-sectional shape as the hole of the paper feed roller, and the rotary shaft is provided with a concave portion that engages with the convex portion of the paper feed roller.

Furthermore, in order to achieve the above object, the present invention is characterized in that a grip portion is provided in a region other than the arc of the paper feed roller.

Further, in order to achieve the above object, according to the present invention, a sheet feeding roller for feeding a sheet placed on a sheet placing section is made of a collar and an elastic material covering an outer periphery of the collar,
In a sheet feeding device of an image forming apparatus in which the sheet feeding roller is formed in a half-moon shape and is supported by a cantilever-shaped rotating shaft, when the sheet feeding roller is fitted to the rotating shaft, A locking device for locking the paper roller to the rotating shaft is provided, and the locking device is composed of a concave portion provided on the collar inner diameter portion and a convex portion provided on the rotating shaft and engageable with the concave portion. I am trying.

Furthermore, in order to achieve the above object, the present invention provides a lock device for locking the paper feed roller to the rotary shaft when the paper feed roller is fitted to the rotary shaft. Is composed of a convex portion formed on an elastically deformable member provided on the inner diameter portion of the collar and a concave portion provided on the rotating shaft and engageable with the convex portion.

Further, in order to achieve the above object, the present invention is characterized in that a member protruding toward one side portion in the width direction of the sheet feeding roller is provided on the inner diameter side of the collar.

Further, in order to achieve the above object, the present invention is directed to a sheet feeding roller for feeding a sheet placed on a sheet placing section formed in a half-moon shape, and the sheet feeding roller having a cantilever shape. In the sheet feeding device of the image forming apparatus supported on the rotating shaft of the rotating shaft, a hole formed by combining an arc and another shape is formed at the center of the sheet feeding roller, and the sectional shape of the rotating shaft is the same as that of the sheet feeding roller. Holding means is formed in the same shape as the hole and holds the half-moon shaped flat portion of the paper feeding roller from the outside when the rotating shaft and the paper feeding roller are fitted, and the holding means is the half moon shaped of the paper feeding roller. It is characterized by having a lever member provided with a protrusion that fits into a recess formed in the plane portion of the.

Further, in order to achieve the above object, according to the present invention, a hole formed by combining a circular arc and another shape is formed at the center of the paper feeding roller, and the sectional shape of the rotating shaft is the hole of the paper feeding roller. And a holding means for holding the half-moon-shaped flat portion of the paper feed roller from the outside when the rotary shaft and the paper-feed roller are fitted to each other. Is provided with a tab, and the holding means has a support portion that folds the tab of the paper feed roller in the thrust direction.

[0014]

According to the above construction, a hole formed by combining an arc and another shape is formed at the center of the paper feed roller, and the cross-sectional shape of the rotary shaft is formed in the same shape as the hole of the paper feed roller. When fitted with a paper roller, the dimensions and shape of the interference fit become
Since the elastic force of the roller supports the rotation shaft, if the paper feed roller is fitted to the rotation shaft in the same shape, the paper feed roller will be attached to the rotation shaft by the elastic force of the paper feed roller itself due to the tight fit. It can be crimped and the paper feed roller can be easily attached securely. Other effects will be apparent from the description of the embodiments below.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are a perspective view and a sectional explanatory view of a printer equipped with a paper feeding device according to the present invention.

In FIGS. 1 and 2, reference numeral 1 is a printer body, 2 is a paper feeding device, and the paper feeding device 2 is provided in the lower portion of the printer body 1 and is drawn out from the printer body 1. A paper feed tray 3 is provided. An image forming unit 4 is arranged above the paper feeding device 2 in the printer body 1, and the image forming unit 4 is also formed in a drawer shape. Paper feeder 2
Has a half-moon-shaped paper feed roller 5, which is supported by a rotary shaft 6, and the rotary shaft 6 is fixed to the supporting bearing member 7 in a cantilevered manner as shown in FIG. Supported.

In this printer, when a paper feed command is issued, the paper feed roller 5 makes one rotation and the paper 8 is sent out along the guide 9. The fed-out sheet 8 reaches the conveyance roller 10 and is conveyed to the image forming unit 4 by the conveyance roller 10.
Then, the image is transferred and fixed, and then discharged to the outside of the machine.

The paper feed roller 5 is a consumable item as described above, and needs to be replaced as the printer ages.

Therefore, in the present invention, the user can easily replace the paper feed roller 5, and an embodiment thereof will be described with reference to FIGS.

In FIG. 4, the paper feed roller 5 is formed with a hole 11 in the center thereof having a cross-sectional shape of an arc and another shape, and the cross-sectional shape of the tip 6a of the rotary shaft 6 to which the paper feed roller 5 is attached. Are formed in the same shape as the holes 11 of the paper feed roller 5. When the paper feed roller 5 is fitted to the tip 6a of the rotating shaft 6, the size and shape of the interference fit, that is, the hole 11 of the paper feed roller 5 is formed to be slightly smaller than the tip 6a. Further, the paper feed roller 5 of this example is entirely made of an elastic material such as rubber.

In the sheet feeding device 2 thus constructed, the tip 6a of the rotary shaft 6 and the hole 11 have the same shape, but the size and shape of the fitting is tight. Therefore, if the paper feeding roller 5 is fitted to the rotary shaft 6. ,
The paper feed roller 5 itself is supported by the rotary shaft 6 by its elastic force. In addition, when the paper feed roller 5 has a half-moon shape, it is necessary to align the position of the rotary shaft 6 in the circumferential direction, but the shaft 6 and the hole 11 are not circular, but an arc and another shape are combined. Because of the curved shape, the position of both can be surely aligned.

FIG. 5 is a perspective view showing another embodiment of the present invention. In the case of this embodiment, the groove 12 is formed on the side of the tip 6a of the rotary shaft 6.
The groove 12 is formed to have the same width in the axial direction as the width of the sheet feeding roller 5 made of an elastic material. Further, a small-diameter positioning pin 13 is planted at the tip 6a of the rotary shaft 6. On the other hand, the paper feed roller 5 is formed with a hole 14 having the same diameter as the groove 12 and a small hole 15 having the same diameter as the positioning pin 13. The tip 6a of the rotary shaft 6 is formed in a cone shape so that the paper feed roller 5 can be easily attached.

In the sheet feeding device 2 having the above-described structure, the small hole 15 is fitted into the positioning pin 13 of the rotary shaft 6, so that the rotary shaft 6 is
When the hole 14 of the sheet feeding roller 5 is fitted into the sheet feeding roller 5, the sheet feeding roller 5 is fixed to the groove 12. Therefore, the paper feed roller 5 has the rotating shaft 6
Since the circumferential direction is positioned in the positioning pin 13 by the small hole 15 and the thrust direction is positioned by the groove 12, no matter who replaces the paper feed roller 5, the rotary shaft 6 can be fixed at the proper position.

FIG. 6 is a perspective view showing still another embodiment of the present invention. In the case of this embodiment, a hole 16 in which a circular arc and another shape are combined at the center of the sheet feeding roller 5 made of an elastic material.
Is formed, and a concave portion 17 facing inward is provided on the surface of the hole 16. On the other hand, the sectional shape of the rotary shaft 6 is formed in the same shape as the hole 16 of the paper feed roller 5, and the rotary shaft 6 is provided with a convex portion 18 that engages with the concave portion 17 of the paper feed roller 5. The concave portion 17 may be a through hole, and the convex portion 18 is tapered in the insertion direction so that the sheet feeding roller 5 can be fitted easily.

In the sheet feeding device 2 having such a structure, when the sheet feeding roller 5 is fitted with the tip 6a of the rotating shaft 6 in the same shape, the concave portion 17 of the sheet feeding roller 5 is fitted into the convex portion 18 of the rotating shaft 6. Then, the paper feed roller 5 is fixed to the rotary shaft 6. Therefore, the paper feed roller 5 is positioned with its cross-sectional shape in the circumferential direction of the rotary shaft 6,
Since the thrust direction is positioned by fitting the convex portion 18 and the concave portion 17, it is possible to fix the paper feed roller 5 at the proper position of the rotary shaft 6 regardless of who replaces it.

FIG. 7 is a perspective view showing still another embodiment of the present invention. In the case of this embodiment, a tab 19 as a grip portion is provided in a region other than the circular arc of the paper feed roller 5 made of an elastic material. Has been.

The sheet feeding device 2 having such a structure can be operated by holding the tab 19 when the sheet feeding roller 5 is exchanged, and the exchanging operation is simplified. Moreover, if the tab 19 is held, the hole that fits into the rotary shaft 6 of the paper feed roller 5 is expanded, which is advantageous in the replacement operation. The size of the tab 19 is the same as that of the paper feed roller 5.
If the radius is smaller than the radius of the paper feed roller 5, it may be left as it is when it is attached to the paper feed roller 5, but if the radius of the tab 19 is made larger than the radius of the paper feed roller 5, as shown in FIG. When is attached to the rotary shaft 6, it may be folded in the thrust direction with a lever.

FIG. 8 and FIG. 9 are a perspective view and a sectional explanatory view showing still another embodiment of the present invention. In the case of this embodiment,
The paper feed roller 5 is composed of a collar 21 and an elastic material that covers the outer periphery of the collar 21, and a lock device for locking the paper feed roller 5 to the rotary shaft 6 is provided on the rotary shaft 6 and the paper feed roller 5. . An example of the lock device is shown in FIG.
And a concave portion 22 provided in the inner diameter portion of the collar 21,
The recess 2 provided at the tip 6a of the rotary shaft 6 shown in FIG.
2 and the convex part 23 which can be engaged. This convex portion 23
It is a ball fitted into a long hole 24 extending in a direction orthogonal to the axis of the rotary shaft 6 so as not to fall off, and is elastically held by a spring 25 at a position protruding from the circumferential surface of the shaft.

In the sheet feeding device 2 having the above-described structure, the concave portion 22 is provided at the position corresponding to the convex portion 23 of the rotating shaft 6 inside the collar 21 fixed integrally with the sheet feeding roller 5. 5 and the appearance can be made simple.

FIG. 10 is a perspective view showing still another embodiment of the present invention. In the case of this embodiment, the paper feed roller 5 covers the collar 21 and the outer periphery of the collar 21, as in FIG. A lock device that is made of an elastic material and that locks the paper feed roller 5 with the rotary shaft 6 is provided on the rotary shaft 6 and the paper feed roller 5. The locking device is provided with a gripping member 26 provided on the inner diameter portion of the collar 21 and made of an elastically deformable material, and forming a convex portion 27 formed on the gripping member 26. On the other hand, the tip end 6a of the rotary shaft 6 is provided with a concave portion 28 that can be engaged with the convex portion 27 of the sheet feeding roller 5. Further, the holding member 26 is set to have a length that projects one side surface of the sheet feeding roller 5.

In the sheet feeding device 2 having such a configuration, the collar 21 integrated with the sheet feeding roller 5, the gripping member 26 made of an elastically deformable material, and the recess 28 of the tip 6a of the rotating shaft 6 are engaged. Since the convex portion 27 is provided, the concave portion 28 and the convex portion 27 can be elastically attached and detached easily. Also, the shaft structure becomes simpler. Further, if the gripping member 26 projects one side surface of the paper feeding roller 5, the operation by the gripping member 26 becomes easy, which is convenient when it is desired to specify the directionality of the paper feeding roller 5.

FIG. 11 is a perspective view showing still another embodiment of the present invention. In the case of this embodiment, a hole formed by combining an arc and another shape at the center of the sheet feeding roller 5 and the rotary shaft 6 are shown. Tip 6
The cross-sectional shape of a is formed in the same shape. And the rotating shaft 6
When the paper feed roller 5 is fitted to the lever 3, the lever 3 serves as a holding means for holding the half-moon shaped flat portion of the paper feed roller 5 from the outside.
0 is set. This lever 30 has a pin 3 attached to the rotary shaft 6.
A protrusion 33 that is pivotally attached via 1 and that fits into a concave portion 29 formed in a half-moon-shaped flat portion of the sheet feeding roller 5 is formed on the front end side. Further, on the rear end side of the lever 30, a projecting portion 32 is formed between the rotary shaft 6 and the rotary shaft 6 for holding the fitting of the projection 33 into the recess 29.

In the paper feeding device 2 having the above structure, the clothespin-like lever 30 having the protrusion 33 is provided on the rotary shaft 6, and the lever 30 is fitted in the recess 29 provided in the paper feeding roller 5. Since the paper feed roller 5 is fixed at a fixed position, anyone can easily understand it.

FIG. 12 is a perspective view showing another embodiment of the present invention. In the case of this embodiment, the paper feed roller 5 of FIG.
A tab 35 is provided on the half-moon-shaped plane portion of. On the other hand, as shown in FIG. 13, the lever 30 provided at the tip 6a of the rotary shaft 6 is configured so that the tab 35 is folded and held by the tip portion 34 in the thrust direction when the paper feed roller 5 is fitted to the rotary shaft 6. ing.

The thus constructed sheet feeding device 2 has the same effects as those of the embodiment shown in FIG. 11, and the tabs 35 facilitate the attachment / detachment operation.

[0037]

According to the first aspect of the invention, since the hole diameter of the paper feed roller is made smaller than the outer diameter of the rotary shaft, the paper feed roller can be securely fixed on the rotary shaft at the time of setting, and the shape of parts can be improved. Can be a simple shape.

According to the second aspect of the invention, since the groove having the width of the paper feed roller is formed on the rotary shaft, the set position of the paper feed roller can be surely known.

According to the third aspect of the present invention, since the convex portion is provided on the rotary shaft and the concave portion is provided at the corresponding sheet feeding roller position, the convex portion engages, so that the attaching / detaching operation is facilitated and the sheet feeding roller is set. The position can be known more easily and surely. The possibility of soiling or damaging the paper feed surface of the paper feed roller is reduced.

According to the fourth aspect of the invention, since the tab for holding the half-monthly paper feeding roller at the time of attachment / detachment is provided at the position opposite to the paper feeding roller, the paper feeding surface of the paper feeding roller may be soiled or damaged. Less.

According to the fifth aspect of the invention, since the concave portion is provided inside the collar fixed integrally with the paper feeding roller at a position corresponding to the convex portion on the rotating shaft, the shape of the component is simple in appearance. You can However, the ease of replacement is somewhat inferior.

According to the sixth aspect of the invention, since the collar integrally with the sheet feeding roller is provided with the elastic engaging portion which engages with the concave portion of the rotary shaft, the structure of the rotary shaft becomes simpler.

According to the structure of claim 7, since the engaging portion is located at a position visible from the outside when the sheet feeding roller is mounted laterally,
Engagement can be surely confirmed, and it can be easily operated even when disengaged. When it is further removed, it can be easily attached and detached by the releasing gripping member. This gripping member can prevent reverse setting, which is convenient when it is desired to specify the directionality of the paper feed roller.

According to the structure of claim 8, a clothespin-shaped clamp having a convex portion is provided on the rotary shaft, and the convex portion is engaged with the concave portion provided in the paper feeding roller to thereby secure the paper feeding roller. Since it is fixed in place, anyone can easily understand it.

According to the structure of claim 9, a clothespin-shaped clamp having a convex portion is provided on the rotary shaft, and the convex portion is engaged with the concave portion provided in the paper feeding roller to thereby fix the paper feeding roller. Since it is fixed in place, it is easy and easy for anyone to understand, and the tabs make it easy to attach and detach.

[Brief description of drawings]

FIG. 1 is a perspective view of a printer including a paper feeding device according to the present invention.

FIG. 2 is a cross-sectional explanatory view thereof.

FIG. 3 is a perspective view showing a paper feed roller support portion.

FIG. 4 is a perspective view showing an embodiment of the present invention.

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing still another embodiment of the present invention.

FIG. 7 is a perspective view showing still another embodiment of the present invention.

FIG. 8 is a perspective view showing still another embodiment of the present invention.

FIG. 9 is a cross-sectional explanatory view thereof.

FIG. 10 is a sectional explanatory view showing still another embodiment of the present invention.

FIG. 11 is a sectional explanatory view showing still another embodiment of the present invention.

FIG. 12 is a cross sectional view showing still another embodiment of the present invention.

13 is a cross-sectional explanatory view showing a state where the paper feed roller of FIG. 12 is fitted to a rotation shaft.

[Explanation of symbols]

 2 Paper Feeding Device 5 Paper Feed Roller 6 Rotating Shaft 6a Rotating Shaft Tip 11 Hole 12 Groove 13 Positioning Pin 17 Recess 18 Convex 19 Tab 21 Collar 22 Recess 23 Convex 26 Gripping Member 27 Convex 28 Recess 29 Recess 30 Lever 33 Projection 35 tab

Claims (9)

[Claims] 1. A sheet feeding roller made of an elastic material for feeding a sheet placed on a sheet placing section is formed in a half-moon shape, and the sheet feeding roller is supported by a cantilever-shaped rotating shaft. In the sheet feeding device of the image forming apparatus, a hole formed by combining an arc and another shape is formed at the center of the sheet feeding roller, and the cross-sectional shape of the rotating shaft is formed in the same shape as the hole of the sheet feeding roller. A sheet feeding device for an image forming apparatus, characterized in that when the rotary shaft and the paper feed roller are fitted, the size and shape of the fit fit tightly and the elastic force of the roller supports the rotary shaft. 2. A sheet feeding roller made of an elastic material for feeding a sheet placed on a sheet placing section is formed in a half moon shape, and the sheet feeding roller is supported by a cantilever-shaped rotating shaft. In the sheet feeding device of the image forming apparatus, when the groove formed in the width of the sheet feeding roller on the rotating shaft and the sheet feeding roller are fitted on the rotating shaft, the sheet feeding roller is positioned in the circumferential direction. A sheet feeding device of an image forming apparatus, which is provided with a means. 3. A sheet feeding roller made of an elastic material for feeding a sheet placed on a sheet placing section is formed in a half moon shape, and the sheet feeding roller is supported by a cantilever-shaped rotating shaft. In the sheet feeding device of the image forming apparatus, a hole formed by combining an arc and another shape is formed at the center of the sheet feeding roller, and a convex portion facing inward is provided on the surface of the hole,
A sheet feeding device of an image forming apparatus, wherein a cross-sectional shape of the rotating shaft is formed in the same shape as a hole of the sheet feeding roller, and a concave portion that engages with a convex portion of the sheet feeding roller is provided on the rotating shaft. . 4. A sheet feeding roller made of an elastic material for feeding a sheet placed on a sheet placing section is formed in a half moon shape, and the sheet feeding roller is supported by a cantilever-shaped rotating shaft. In the sheet feeding device of the image forming apparatus, the gripping portion is provided in a region other than the circular arc of the sheet feeding roller. 5. A paper feeding roller for feeding the paper placed on the paper placing portion is made of a collar and an elastic material covering the outer periphery of the collar, and the paper feeding roller is formed in a half moon shape and cantilevered. In a sheet feeding device of an image forming apparatus supported by a beam-shaped rotating shaft, a locking device that locks the sheet feeding roller to the rotating shaft when the sheet feeding roller is fitted to the rotating shaft is provided. The sheet feeding device of the image forming apparatus, wherein the locking device includes a concave portion provided in the collar inner diameter portion and a convex portion provided in the rotary shaft and engageable with the concave portion. 6. A paper feeding roller for feeding the paper placed on the paper placing portion is made of a collar and an elastic material covering the outer periphery of the collar, and the paper feeding roller is formed in a half-moon shape and is cantilevered. In a sheet feeding device of an image forming apparatus supported by a beam-shaped rotating shaft, a locking device that locks the sheet feeding roller to the rotating shaft when the sheet feeding roller is fitted to the rotating shaft is provided. The image forming apparatus, wherein the locking device includes a convex portion formed on an elastically deformable member provided in the collar inner diameter portion and a concave portion provided on the rotating shaft and engageable with the convex portion. Paper feeder. 7. A paper feeding roller for feeding the paper placed on the paper placing portion is made of a collar and an elastic material covering the outer periphery of the collar, and the paper feeding roller is formed in a half-moon shape and cantilevered. In a sheet feeding device of an image forming apparatus supported by a beam-shaped rotating shaft, a member protruding toward one side portion in the width direction of the sheet feeding roller is provided on an inner diameter side of the collar. Paper feeding device of image forming apparatus. 8. An image forming apparatus in which a sheet feeding roller for feeding a sheet placed on a sheet placing section is formed in a half-moon shape, and the sheet feeding roller is supported by a cantilever-shaped rotating shaft. In the paper feeding device, a hole formed by combining an arc and another shape is formed at the center of the paper feeding roller, and the cross-sectional shape of the rotating shaft is formed in the same shape as the hole of the paper feeding roller. Holding means for holding the half-moon-shaped flat portion of the paper-feed roller from the outside when fitted with the paper-feed roller is provided, and the holding means is fitted in the recess formed in the half-moon-shaped flat portion of the paper-feed roller. A sheet feeding device of an image forming apparatus, comprising a lever member having a protrusion. 9. An image forming apparatus in which a sheet feeding roller for feeding a sheet placed on a sheet placing section is formed in a half-moon shape, and the sheet feeding roller is supported by a cantilever-shaped rotating shaft. In the paper feeding device, a hole formed by combining an arc and another shape is formed at the center of the paper feeding roller, and the cross-sectional shape of the rotating shaft is formed in the same shape as the hole of the paper feeding roller. Holding means for holding the half-moon shaped flat portion of the paper feeding roller from the outside when fitted to the paper feeding roller is provided with a tab on the half-moon shaped flat portion of the paper feeding roller, and the holding means is provided. A sheet feeding device of an image forming apparatus, comprising a supporting portion that folds a tab of a paper roller in a thrust direction.