JP2002308457A - Paper feeder and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeder preventing a pad from squeaking without deteriorating performance. SOLUTION: Even if stick slip occurs when a paper sheet P is separated by a paper feed roller 58 and a separation pad 74, pad squeaking can be prevented by supporting a separation pad holder 70 rotatably by letting the turning shaft 72 of the separation pad 70 fit in the U-shaped groove 62 formed on a paper sheet guide and making silicone adhesives 84 intervene between the internal wall face 63 of the groove 62 and the turning shaft 72. This is because the silicone adhesives 84 absorbs the vibration of the separation pad holder 70, resulting in the reduction of vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus for feeding sheets such as a recording medium and a document one by one, and an image forming apparatus provided with the sheet feeding apparatus.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus of an ink jet system for forming an image by discharging ink onto a recording medium such as a recording paper, and an electrophotographic system for forming an image on a recording medium by using a developer (toner). Is known. These image forming apparatuses generally include an image forming unit that forms an image on a recording medium, and a paper feeding device that feeds the recording medium to the image forming unit.

A printer as an example of an image forming apparatus includes:
2. Description of the Related Art Generally, a sheet feeding device that feeds sheets from a sheet cassette that stores a rectangular recording medium (sheet) is provided. In addition to this type of paper feeding device, the printer may be provided with a paper feeding device of a type in which a user places a recording medium on a tray and feeds this recording medium. This type is called a multi sheet feeder. Since the multi-sheet feeding device can feed recording media of various sizes and various recording media, it is efficient when a small amount of sheets are fed, or when thick paper and film paper are fed.

An example of a conventional multi sheet feeder will be described with reference to FIGS.

FIG. 6 is a side view showing a multi-sheet feeding device. FIG. 7 is a perspective view showing a separation pad and a separation pad holder. FIG. 8 is an enlarged view showing the separation pad pressed against the multi-feed roller via the recording medium.

The multi-sheet feeding device 50 includes a multi-medium plate 54 on which a plurality of recording media P are stacked,
And a multi-medium plate spring 56 for urging the end in the sheet feeding direction upward. Above the multi-middle plate spring 56, the recording media stacked on the multi-middle plate 54 are fed one by one (arrow C).
A multi-feed roller 58 for feeding paper in the direction (1) is disposed.

A paper feed guide 60 that guides the fed recording medium downstream in the paper feed direction is disposed slightly downstream of the multi paper feed roller 58 in the paper feed direction. A pair of U-shaped grooves 62 are formed in the paper feed guide 60 at the upstream side in the paper feed direction. The opening 62a of each groove 62 is downward.

A plate-like separation pad holder 70 is arranged adjacent to the paper feed guide 60 and upstream of the paper feed guide. On the downstream side in the sheet feeding direction of the separation pad holder 70,
Two rotating shafts 72, 72 orthogonal to the paper feeding direction are formed. The two rotating shafts 72 fit into the grooves 62, respectively. A rectangular separation pad 74 made of urethane rubber containing cork or the like is attached to the surface of the separation pad holder 70 on the upstream side in the sheet feeding direction. The separation pad 74 and the multi-feed roller 58
And the recording medium is sandwiched between them.

Below the separation pad 74, a multi-coil spring 76 for urging the separation pad holder 70 upward is arranged. Since the multi-coil spring 76 pushes up a portion of the separation pad holder 70 opposite to the rotation shaft 72 from below, the separation pad holder 70 rotates about the rotation shaft 72. As a result, the separation pad 74 is pressed against the multi-feed roller 58. Therefore, the recording medium P sandwiched between the separation pad 74 and the multi-feed roller 58
Are fed one by one in the sheet feeding direction by rotating the multi-sheet feeding roller 58 in the direction of arrow D.

In order to smoothly feed the recording medium P in the paper feeding direction, the surface of the separation pad 74 needs to be pressed against the outer peripheral surface of the multi-feed roller 58 with a uniform contact pressure. If the contact pressure is not uniform, the recording medium P may not be fed smoothly. For example,
When a contact pressure greater than the other of the portions of the separation pad 74 in the left-right direction (the direction orthogonal to the direction of arrow C) acts on the separation pad 74, the recording medium P being separated is skewed, A paper jam (jam) occurs near the separation pad 74 without P being separated.

As described above, in order for the surface of the separation pad 74 to be pressed against the outer peripheral surface of the multi-feed roller 58 with a uniform contact pressure, the separation pad 74 must be
It is necessary that the contact line 74a at the time of contact with the rotation axis 8 and the rotation center line 72a of the rotation shafts 72, 72 of the separation pad holder 70 be parallel. However, the accuracy of the position where the paper feed guide 60 is fixed to the main body of the printer and the separation pad holder 7
Since the accuracy of the shape of 0 may be poor, the contact line 74a and the rotation center line 72a may not be parallel.

Therefore, when the rotation shaft 72 is fitted into the groove 62 without any gap so that the rotation shaft 72 can freely rotate in the groove 62, the contact line 74a and the rotation center are The lines 72a are unlikely to be parallel. Therefore, by forming the groove 62 relatively larger than the outer diameter of the rotation shaft 72, the contact line 74a and the rotation center line 72a are configured to be parallel regardless of the accuracy described above. . As a result,
The surface of the separation pad 74 is pressed against the outer peripheral surface of the multi-feed roller 58 with a uniform contact pressure.

The friction coefficient of the multi-feed roller 58 with respect to the recording medium P and the friction coefficient of the separation pad 74 are different from each other. Further, since the groove 62 is larger than the outer diameter of the rotating shaft 72 as described above, there is some backlash between these two. For this reason, when the recording medium P sandwiched between the separation pad 74 and the multi-sheet feeding roller 58 is fed, the recording medium P and the separation pad 74 may rub against each other, causing stick-slip. Due to the stick-slip, vibration is generated, and chattering sound (pad noise) may be generated.

The following techniques (1) to (4) can be considered as techniques for preventing the pad squeal. (1) A member that contacts the front surface or the back surface of the recording medium P is disposed downstream of the position where the multi-sheet feeding roller 58 and the separation pad 74 sandwich the recording medium P in the sheet feeding direction. Technology to stop vibration. (2) A technique for preventing pad squeak by reducing the force by which the separation pad 74 presses the multi-feed roller 58 to prevent stick-slip. (3) A technique for devising the weight and shape of the separation pad holder 70 in order to reduce the vibration of the separation pad holder 70 by changing the resonance point of the separation pad holder 70. (4) A technique for preventing the vibration of the separation pad holder 70 by fitting the rotating shaft 72 into the groove 62 without any gap.

[0015]

However, in the technique (1), the vibration of the recording medium P can be stopped, but the vibration of the separation pad holder 70 cannot be stopped, so that the pad squeal cannot be completely prevented.

In the technique (2), since the separation of the recording medium P is likely to be incomplete, the recording medium P may be multi-fed and the sheet feeding performance may be reduced.

Further, in the technique (3), vibration of the separation pad holder 70 can be reduced, but pad squealing occurs depending on the thickness and density of the recording medium P and the strength of the waist (rigidity).

Further, according to the technique (4), the contact pressure when the separation pad 74 comes into contact with the multi-feed roller 58 becomes non-uniform, so that the recording medium P is not fed smoothly and the feeding performance is reduced. There is a possibility that.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a paper feeder which prevents pad squeal without lowering the paper feed performance.

[0020]

According to a first aspect of the present invention, there is provided a sheet feeder comprising: a sheet feed rotating body; and a separation pad which holds the separation pad and faces the sheet feed rotary body. And a holder supporter for rotatably supporting the separation pad holder, for separating and sending out sheets one by one between the sheet supply rotating body and the separation pad. (1) a vibration absorber interposed between the holder support and the portion of the separation pad holder supported by the holder support to absorb vibration of the separation pad holder. It is characterized by having.

Here, (2) a rotating shaft formed on one of the separation pad holder and the holder support portion and (3) the rotating shaft are rotatably fitted.
A concave portion formed on the other side different from the one side,
(4) The vibration absorber may be interposed between the rotating shaft and the recess.

Also, (5) the other, which is different from the one,
The recess may be formed by forming a hole or a groove on the other side.

(6) The vibration absorber may be an elastic adhesive for rotatably bonding the separation pad holder to the holder support.

In order to achieve the above object, a second paper feeder according to the present invention comprises a paper feed rotating body and a separation pad for holding the separation pad and urging the separation pad toward the paper feed rotary body. A paper feeder, comprising: a holder and a holder support that supports the separation pad holder, and separates and feeds sheets one by one between the paper feed rotating body and the separation pad.
(7) An elastic adhesive filled between the holder supporting portion and a portion of the separation pad holder supported by the holder supporting portion is provided.

Here, (8) the elastic adhesive may be a silicon-based adhesive.

(9) The silicone-based adhesive may be cured while maintaining elasticity with the passage of time.

Further, (10) a rotating shaft formed on one of the separation pad holder and the holder support portion, and (11) the rotating shaft is rotatably fitted. (12) The elastic adhesive may be filled between the rotating shaft and the concave portion.

Further, (13) the other one different from the one may be one in which the recess is formed by forming a hole or a groove in the other.

(14) The holder supporting portion may be formed with a protrusion preventing groove for preventing the elastic adhesive from protruding from the contact portion.

Further, (15) the portion of the separation pad holder supported by the holder support is a shaft-like member orthogonal to the sheet feeding direction, and (16) the separation pad holder of the holder support. Is formed with a U-shaped groove into which the shaft member is fitted. (17) The shaft member is pressed against the top of the groove by urging the separation pad holder. It may have a spring.

According to another aspect of the present invention, there is provided an image forming apparatus comprising:
9) An image forming section for forming an image on a sheet fed from the sheet feeding device.

[0032]

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

Referring to FIG. 1, a printer which is an example of the image forming apparatus of the present invention will be described.

FIG. 1 is a schematic diagram showing an example of a printer.

The printer 10 has a built-in laser optical system 14 for emitting a laser 12 carrying image information. The laser 12 emitted from the laser optical system 14 irradiates the photosensitive drum 16 to form an electrostatic latent image. Around the photosensitive drum 16, a charger 18 for uniformly charging the surface, a developing device 20 for supplying a developer to the electrostatic latent image to form a developed image, and a transfer roller for transferring the developed image to a recording medium 2
2 and the like are sequentially arranged along the rotation direction of the photosensitive drum 16 (the direction of arrow A).

Above the photosensitive drum 16, a fixing device 24 for fixing a developed image to a recording medium is arranged. The fixing device 24 is provided with a fixing roller 24a having a built-in heater and a pressure roller 24b pressed against the fixing roller 24a. When fixing the transferred image to the recording medium, the recording medium is sandwiched between the fixing roller 24a and the pressure roller 24b, and the transferred image is heated at a predetermined fixing temperature and simultaneously pressed.
The transferred image is fixed on the recording medium by the heating and the pressing.

Below the photosensitive drum 16, a paper feed cassette 26 for accommodating recording media of the same size is detachably mounted in the direction of arrow B. Inside the paper feed cassette 26, an intermediate plate 28 on which a recording medium is loaded is arranged. One end of the middle plate 28 is urged upward by a coil spring 30. At the outlet of the paper feed cassette 26 (above the coil spring 30), a paper feed roller 32 for feeding out the recording medium stored in the paper feed cassette 26 is arranged.

The recording medium sent out by the paper feed roller 32 is conveyed toward the photosensitive drum 16 while being guided by guide rollers 34 and the like. Two-dot chain line 36 in the figure
Indicates the transport path of the recording medium. A pair of registration rollers 38 that rotates in synchronization with the rotation of the photosensitive drum 16 is disposed downstream of the guide rollers 34 in the transport direction. The registration rollers 38 correct skew of the recording medium. The feeding timing of the recording medium is adjusted so that the position with the developed image formed on the photosensitive drum 16 matches.

When an image is formed on a recording medium by the printer 10, a laser 12 emitted from a laser optical system 14 is irradiated on a photosensitive drum 16 to form an electrostatic latent image. This electrostatic latent image is developed with the toner supplied from the developing device 20 to form a developed image. This developed image moves toward the transfer roller 22 as the photosensitive drum 16 rotates.

On the other hand, the recording medium sent from the paper feed cassette 26 is guided by the guide rollers 34 to the registration rollers 3.
You will be guided to 8. The recording medium is conveyed from the registration roller 38 toward the transfer roller 22 at a predetermined timing. The recording medium thus conveyed is charged by the transfer roller 22 with a polarity opposite to that of the developer forming the development, and this developer is attracted to the recording medium to form a transfer image. The recording medium on which the transfer image has been formed is
4, the transferred image is fixed on the recording medium, and then discharged to a discharge tray 42 by a discharge roller 40. Below the laser optical system 14, a case 44 that accommodates electrical components such as a power supply and a printed circuit board, a control device for performing various controls, a controller board, and the like is disposed.

Incidentally, the printer 10 is provided with a multi-sheet feeding device 80 (an example of a sheet feeding device according to the present invention) in addition to the sheet feeding cassette 26 for feeding a recording medium. The multi-sheet feeding device 80 stores recording media of various sizes. The recording medium P stored in the multi-sheet feeding device 80 is fed in the direction of arrow C and reaches the registration roller 38. An image is formed on the recording medium P in the same manner as described above.

The multi-sheet feeding device 80 will be described with reference to FIGS.

FIG. 2 is an enlarged side view of the multi-sheet feeding device. FIG. 3 is a front view of the multi-sheet feeding device of FIG. 2 viewed from a sheet feeding direction. FIG. 4A is a schematic diagram illustrating a rotation axis that is in contact with the top of the groove, and FIG. 4B is a schematic diagram illustrating a rotation axis that is off the top of the groove.

The multi-sheet feeding device 80 stores recording media of various sizes. The multi-sheet feeding device 80 includes a multi-medium plate 54 on which a plurality of recording media P are stacked, and a multi-medium plate spring 56 for urging the end of the multi-medium plate 54 in the sheet feeding direction upward. Above the multi-middle plate spring 56, a multi-sheet supply roller 58 as a sheet supply rotating member for feeding the recording media stacked on the multi-middle plate 54 one by one in the sheet supply direction (the direction of arrow C). Are located. Further, the multi-sheet feeding device 80 has a side regulating plate 82 for regulating and aligning both ends in the width direction of the recording medium P stacked on the multi-medium plate 54.
(See FIG. 1). In the present invention, a paper feed belt system using a belt instead of the paper feed roller may be used.

Separation pad holder 7 of multi sheet feeder 80
Two rotating shafts 72, 72 (which are examples of the shaft-like member according to the present invention) are formed at 0. The separation pad 74 is attached to the separation pad holder 70. These structures correspond to a conventional multi-sheet feeding device 50 (see FIG. 8).
It has the same structure as. Further, a groove 62 (an example of a groove according to the present invention) into which the two rotation shafts 72 are fitted is formed in the paper feed guide 60. This structure is the same as the conventional structure. The separation pad holder 75 and the separation pad 74 are integrated to form a separation pad unit 75.

A feature of the multi-sheet feeding device 80 is that a silicon-based adhesive 84 is interposed at a contact portion where the two rotating shafts 72 contact the inner wall surface 63 of the groove 62. As described above, since the silicon-based adhesive 84 is interposed between the rotation shaft 72 and the inner wall surface 63, the rotation shaft 72 does not contact the inner wall surface 63 (except for the apex 63a) even if it vibrates. FIG.
As shown in (a), the silicone adhesive 84 is not interposed between the apex 63a of the inner wall surface 63 and the rotation shaft 72,
Between the side surface 63b of the inner wall surface 63 and the rotating shaft 72, a thickness 8
The silicon-based adhesive 84a of FIG.

Further, as shown in FIG.
2 may come off from the apex 63a of the inner wall surface 63 of the groove 62. Even in such a case, since the silicon-based adhesive 84 is filled and interposed between the inner wall surface 63 and the rotating shaft 72, the silicon-based adhesive is interposed between the inner wall surface 63 and the rotating shaft 72. The agent 84 is interposed.

Further, the rotation shaft 72 is fitted into the U-shaped groove 62, and the separation pad holder 70 is urged by the separation spring 76, so that the separation pad holder 70 moves in the groove 62. The contact line 74a (see FIG. 7) when the separation pad 74 contacts the multi-sheet feeding roller 58 and the rotation center line 7 of the rotation shafts 72, 72 of the separation pad holder 70.
2a (see FIG. 7) automatically becomes parallel.

When the silicone adhesive 84 is interposed as described above, a liquid silicone adhesive 84 is injected between the rotating shaft 72 and the inner wall surface 63. After a lapse of a predetermined time, the silicone adhesive 84 hardens and has elasticity. The rotating shaft 72 is urged by the multi-coil spring 76 to the vertex 63a of the groove 62. Accordingly, since the separation pad holder 70 is forcibly adjusted to the position of the groove 62, the positional relationship between the separation pad 74 and the multi-feed roller 58 is properly maintained, and the recording medium P can be transported without trouble such as double feeding. Paper is fed smoothly. Further, since the rotating shaft 72 is elastically bonded inside the groove 62 and can move freely, the separation pad holder 70 is also moved by the coil spring 76 to the rotating shaft 7.
It rotates freely around 2.

In this case, since the silicon-based adhesive 84 is used, the silicon-based adhesive 84 can easily enter between the rotating shaft 72 and the groove 62. In addition, since the silicone-based adhesive 84 is cured and becomes rubbery, the silicone-based adhesive 84 does not protrude from between the rotation shaft 72 and the groove 62 after the silicone-based adhesive 84 is cured,
During this time, it can be easily interposed as a vibration absorbing material.

Here, the multi sheet feeding device 80 is
The operation of the silicone adhesive 84 when the sheet is fed in the direction of arrow C will be described.

The separation pad 74 is pressed against the multi-feed roller 58. For this reason, the recording medium P sandwiched between the separation pad 74 and the multi-feed roller 58 is fed one by one in the feed direction by rotating the multi-feed roller 58 in the direction of arrow D. Here, the friction coefficient of the multi-feed roller 58 and the friction coefficient of the separation pad 74 with respect to the recording medium P may be different from each other. In the multi-sheet feeding device 80, the groove 62 is larger than the outer diameter of the rotating shaft 72, and a silicon-based adhesive 84 is interposed between the two.

Therefore, when the recording medium P sandwiched between the separation pad 74 and the multi-feed roller 58 is fed,
Even if the recording medium P and the separation pad 74 rub against each other to cause stick-slip, and the separation pad holder 70 tries to vibrate in the paper feeding direction and the opposite direction, the vibration is absorbed by the silicon-based adhesive 84. In addition, depending on the thickness and density of the recording medium P and the strength of the “stiffness” (rigidity), severe stick-slip occurs, and the separation pad holder 70 tends to vibrate greatly in the sheet feeding direction and the opposite direction.
However, such vibrations are also absorbed by the silicone adhesive 84. As described above, even if the separation pad holder 70 tries to vibrate, the vibration is suppressed by the silicon-based adhesive 84, so that pad squeak can be prevented.

As described above, by filling the elastic adhesive such as the silicon adhesive 84 between the rotation shaft 72 and the groove 62, the elastic adhesive rotatably supports the separation pad holder 70. Since it has a bonding function and a vibration absorbing function of absorbing vibration of the separation pad 74, pad squeal can be reliably prevented with a simple configuration.

A second embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a perspective view showing the sheet feeding guide from which the separation pad holder has been removed. In this figure, the same components as those shown in FIG. 7 are denoted by the same reference numerals.

The feed guide 90 has a groove 92 into which the rotating shaft 72 is fitted. As shown in FIG. 4, between the rotating shaft 72 fitted into the groove 92 and the groove 92,
The silicon adhesive 84 is interposed. Paper feed guide 90
Is characterized in that a deeper groove 94 is formed adjacent to the groove 92 and outside the groove 92.

As described above, when the silicon-based adhesive 84 is interposed, the liquid silicone-based adhesive 84 is injected between the rotating shaft 72 and the inner wall surface 63. In this case, even if the amount of the liquid silicone adhesive 84 is too large, an excess amount flows into the groove 94. Therefore, the silicone adhesive 84 does not leak to the surface of the paper feed guide 90 (the surface with which the recording medium P contacts). Therefore, it is possible to prevent a recording medium from being transported poorly and a separation failure caused by the separation pad 74.

The present invention is not limited to the above embodiment. In the above-described embodiment, a silicon-based adhesive has been described as an example of the vibration absorbing material. However, another elastic adhesive may be used as the vibration absorbing material. Further, the separation pad holder 70 may be configured so that the rotating shaft 72 is inserted into a round hole instead of the U-shaped groove, and the elastic adhesive may be loaded. Also, the separation pad holder 7
0, a groove or hole is formed, and a rotation shaft is provided on a member (sheet feed guide 60 in this embodiment) supporting the separation pad holder 70, and the separation pad holder 70 is fitted into the rotation shaft. May be configured to be rotatably supported.

Further, according to the present invention, the separation pad is not affixed to the separation pad holder as in the present embodiment as in this embodiment, but a separation piece formed of an elastic plate such as rubber is pressed against the paper feed roller. It may be configured.

Further, in this embodiment, an example is shown in which the present invention is applied to a multi-sheet feeding device. However, the present invention may be applied to a sheet feeding device for feeding sheets from a sheet feeding cassette or a sheet feeding deck. . Also, an example in which the present invention is applied to a sheet feeding device that supplies a recording medium for forming an image has been described.
The present invention may be applied to a paper feeder (a so-called automatic document feeder) for supplying a document to the image reading unit.

[0062]

As described above, according to the first paper feeding apparatus of the present invention, even if the separation pad is strongly pressed against the paper feeding roller in order to maintain the paper feeding performance, even if the stick-slip occurs, the vibration is absorbed. The body absorbs the vibration of the separation pad holder. For this reason, even if a stick-slip occurs, vibration of the separation pad holder is suppressed, and pad squeak can be prevented.

According to the second sheet feeding device of the present invention,
The elastic adhesive absorbs the vibration of the separation pad holder even if the separation pad is strongly pressed against the paper feed roller to maintain the paper feeding performance and stick-slip occurs. For this reason,
Even if stick-slip occurs, vibration of the separation pad holder is suppressed, so that pad squeak can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a printer as an example of an image forming apparatus of the present invention.

FIG. 2 is an enlarged side view showing a multi sheet feeding device.

FIG. 3 is a front view of the multi sheet feeding device of FIG. 2 as viewed from a sheet feeding direction.

FIG. 4A is a schematic diagram illustrating a rotation axis that is in contact with a vertex of a groove, and FIG. 4B is a schematic diagram illustrating a rotation axis that is off the vertex of the groove.

FIG. 5 is a perspective view showing a sheet feeding guide from which a separation pad holder is removed.

FIG. 6 is a side view showing a conventional multi-sheet feeding device.

FIG. 7 is a perspective view showing a separation pad and a separation pad holder.

FIG. 8 is an enlarged view showing a separation pad pressed against a multi-feed roller via a recording medium.

[Explanation of symbols]

 58 Multi paper feed roller (paper feed rotating body) 70 Separation pad holder 72 Rotation axis 74 Separation pad 75 Separation pad unit 80 Multi paper feeder (paper feeder) 84 Silicone adhesive 92 Groove (holder holder) 94 Deep Groove P Recording medium (sheet)

Claims (12)

[Claims] 1. A sheet supply rotating body, a separation pad holder that holds a separation pad and urges the separation pad toward the sheet supply rotating body, and a holder support that rotatably supports the separation pad holder. A sheet feeding device for separating and sending out sheets one by one between the sheet feeding rotating body and the separation pad, wherein the holder supporting portion and the separation pad holder have the holder supporting portion. A sheet feeder comprising: a vibration absorber interposed between a supported portion and a vibration absorber for absorbing vibration of the separation pad holder. 2. A rotating shaft formed on one of the separation pad holder and the holder supporting portion, and a rotating shaft which is rotatably fitted into the rotating shaft. The sheet feeding device according to claim 1, further comprising: a formed recess; wherein the vibration absorber is interposed between the rotation shaft and the recess. 3. The paper feeding device according to claim 2, wherein the other different from the one has the recess formed by forming a hole or a groove in the other. 4. The apparatus according to claim 1, wherein the vibration absorber is an elastic adhesive for rotatably bonding the separation pad holder to the holder support.
The sheet feeding device according to claim 3. 5. A paper feed rotating body, a separation pad holder that holds a separation pad and urges the separation pad toward the paper feed rotating body, and a holder supporting portion that supports the separation pad holder. A sheet feeding device that separates and feeds sheets one by one between the sheet feeding rotating body and the separation pad, wherein the holder supporting portion and a portion of the separation pad holder supported by the holder supporting portion; A sheet feeding device comprising an elastic adhesive filled in between. 6. The sheet feeding device according to claim 5, wherein the elastic adhesive is a silicon-based adhesive. 7. The sheet feeding device according to claim 6, wherein the silicone-based adhesive cures while maintaining elasticity as time passes. 8. A rotating shaft formed on one of both the separation pad holder and the holder supporting portion, and a rotating shaft which is rotatably fitted into the other shaft. 8. The device according to claim 5, further comprising: a formed recess, wherein the elastic adhesive is filled between the rotation shaft and the recess. 9. Paper feeder. 9. The paper feeding device according to claim 8, wherein the other different from the one has the recess formed by forming a hole or a groove in the other. 10. The holder support portion according to claim 5, wherein a protrusion preventing groove for preventing the elastic adhesive from protruding from the contact portion is formed. 2. The paper feeding device according to claim 1. 11. A portion of the separation pad holder supported by the holder support is a shaft member orthogonal to the sheet feeding direction, and a portion of the holder support that supports the separation pad holder is the shaft support. A U-shaped groove into which the shaft member is fitted is formed, and a spring is provided which presses the shaft member against the apex of the groove by urging the separation pad holder. Any one of claims 1 to 10
Paper feeder according to the item. 12. The method according to claim 1, wherein
An image forming apparatus, comprising: the sheet feeding device according to any one of the preceding items, and an image forming unit that forms an image on a sheet fed from the sheet feeding device.