JP2003118861A - Paper separating and feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper separating and feeding device with simple structure capable of restraining generation of paper dust and securely separating paper without lowering conveyance performance during paper feeding. SOLUTION: In the paper separating and feeding device comprised of a paper feeding roller and a friction member arranged opposite to the paper feeding roller and pressed to the direction of the paper feeding roller, the friction member is comprised of a first friction member pressed on the paper feeding roller and a second friction member having a coefficient of friction higher than that of the first friction member and pressed on the paper feeding roller with lower pressure than the first friction member or having a gap of a prescribed width between it and the paper feeding roller. Both the first and the second friction member are provided on one side of a base board elastically energized toward the paper feeding 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 device used in an image forming apparatus such as an electronic copying machine, and more particularly to a separating sheet feeding device having a separating function for separately feeding sheets one by one.

[0002]

2. Description of the Related Art Conventionally, for example, electronic copying machines, FA
An image forming apparatus such as an X or a printer is provided with a separating / feeding apparatus having a function of automatically separating and conveying sheets one by one to an image forming unit for normal printout. This separation sheet feeding device includes a fixed friction member and a sheet feeding roller that rotates in the vicinity of the friction member. When the sheet feeding roller rotates, the sheet feeding device is caught between the friction member and the sheet feeding roller. Among the two or more sheets of paper that are in contact with each other, the sheet that comes into contact with the friction member is blocked by the friction member, and only the one sheet that is closest to the paper feed roller is separated from the blocked sheet and sent out. It is configured. That is, the friction force generated by pressing the friction member urged in the direction of the paper feed roller against the paper conveyed by the paper feed roller separates the paper one by one, and the paper is transferred to the image forming unit. Is a structure for supplying. However, in the above-mentioned conventional separating / feeding device, when the pressure between the paper feed roller and the friction member is set to a large value due to the structure in which the paper feed roller and the friction member are in constant contact with each other, the paper due to the friction between the friction member and the paper is set. The generation of powder or the increase in transport load poses a problem. Further, when there is no sheet to be conveyed and the paper feed roller is in contact with the friction member and is running idle, the abrasion of the paper feed roller or the friction member progresses significantly. Further, if the pressure between the paper feed roller and the pressure member is set to be too small in consideration of the above problem, the friction between the friction member and the paper is reduced, so that the generation of paper dust is suppressed, but the paper is separated at the same time. Since the paper capacity is lowered, the paper is fed multiple times, and the paper conveyance capacity itself is lowered. Therefore, in Japanese Patent Laid-Open No. 3-152038, it is impossible to separate a high-friction portion, which is formed by pressing the friction member so as to be separable into an intermediate region of the sheet feeding roller, and both end regions of a sheet feeding roller, which is separate from the high friction portion. It is composed of a low friction portion that is pressed against. As a result, the high friction part for separating the paper and the low friction part for feeding the paper can share the roles, and the above-mentioned problem is solved by preventing an excessively large friction from being applied to the paper feed roller.

[0003]

However, in the separating / feeding device according to the above-mentioned publication, a substrate, a biasing member, etc. are provided for each friction member provided independently so that they can be independently displaced. Since the structure is complicated, the structure becomes complicated, and inconvenience in terms of manufacturing cost and downsizing of the separation / feeding device cannot be avoided. Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to achieve downsizing without increasing the manufacturing cost with a simple structure, and further, at the time of paper feeding. An object of the present invention is to provide a separating / feeding device capable of suppressing the generation of paper dust and exhibiting highly accurate paper separation performance without lowering the paper transporting ability.

[0004]

In order to achieve the above object, the present invention is directed to a paper feed roller and a friction member arranged facing the paper feed roller and having a pressing force applied in the direction of the paper feed roller. In a separation sheet feeding device including a member, the friction member has a first friction member pressed against the sheet feeding roller, and a friction coefficient higher than that of the first friction member, A second friction member which is provided in contact with the roller at a pressure lower than that of the first friction member or which is provided with a predetermined gap with respect to the paper feed roller; And the second friction member,
The separating and feeding device is provided on one surface of the base substrate elastically biased toward the feeding roller. With such a configuration, the first friction member, which is mainly for the purpose of conveying the paper, is pressed against the paper feed roller to ensure the paper conveyance ability, and mainly for the purpose of separating the paper. The second friction member is provided in contact with the paper feed roller at a low pressure, or is provided with a predetermined gap with respect to the paper feed roller so that the separation performance of the paper is not deteriorated. It is possible to reduce only the carrying load that hinders the carrying, thereby preventing the generation of paper dust or extending the life of the paper feeding roller and the friction member. Further, since this structure has a simple structure based on the conventional structure, no inconvenience occurs in terms of manufacturing cost and downsizing. Further, it is desirable that the first friction member is formed in a region of 1/3 or less of the entire friction member. By forming the first friction member in this way, it becomes possible to perform the separation of the paper with high accuracy while suppressing the generation of paper dust.

Further, the paper feed roller is made of a deformable elastic material, and the second friction member is brought into contact with the paper feed roller at a pressure lower than that of the first friction member. However, the first friction member may be formed with a step projecting toward the paper feed roller with respect to the second friction member. With this configuration, the friction member is configured such that the first friction member that carries the sheet is brought into pressure contact with the sheet feeding roller, and the second friction member that is used to separate the sheet is brought into contact with the sheet feeding roller at a low pressure. It becomes possible to make it the structure provided with. Therefore, as compared with the conventional separating / feeding device that separates the paper by rubbing the paper with the entire friction member that is pressed with high pressure, the paper is rubbed with the second friction member that is contacted with low pressure. Since the paper is separated by this, it is possible to suppress the generation of paper dust and reduce the carrying load. For example, the step is 10
It is preferably 0 μm or less. By setting the step as described above, it becomes possible to perform the separation of the paper with high accuracy while suppressing the generation of paper dust.

Further, the second friction member is configured to have a predetermined gap with respect to the paper feed roller, and the portion of the paper feed roller facing the second friction member is the paper feed roller. It may be formed with a smaller radius than the portion of the first friction member that is in pressure contact with. According to this structure, the friction member is configured such that the first friction member that carries the sheet is brought into pressure contact with the sheet feeding roller, and the second friction member that separates the sheet is provided with a predetermined gap in the sheet feeding roller. It becomes possible to make it the structure provided. Therefore, in comparison with the conventional separating / feeding device that separates the paper by rubbing the paper with the entire friction member that is pressed with a high pressure, the second friction member that has a predetermined gap is provided. Since the paper is separated by rubbing the paper, it is possible to suppress the generation of paper dust and reduce the transport load. For example, the gap between the paper feed roller and the second friction member is 50
It is desirable that it is not less than μm and not more than 150 μm. By setting the above-mentioned gap or step in this way, it becomes possible to carry out the separation of the paper with high accuracy while suppressing the generation of paper dust.

Further, the second friction member is configured to have a predetermined gap with respect to the paper feed roller, and the second friction member is further arranged in the paper feed roller direction with respect to the first friction member. A protruding step may be formed. With this configuration, it is possible to set a predetermined gap between the second friction member and the paper feed roller and arbitrarily change the radius of the portion of the paper feed roller that faces the second friction member. For example, if the step between the second friction member and the first friction member is 0.5 m
By forming it to m or more and 1.0 mm or less,
Compared to the case where a friction member formed in a flat shape is applied, it is possible to further suppress the generation of paper dust and perform highly accurate paper separation.

Further, the second friction member is configured to have a predetermined gap with respect to the paper feed roller, and the second friction member is formed by a small radius of the paper feed roller. It may be formed smaller by a predetermined value in the axial direction of the paper feed roller. With this configuration, when the paper is separated or conveyed, it is possible to prevent the paper from being folded due to being sandwiched between the paper feed roller and the step formed by the friction member. Becomes For example, the difference between the second friction member and the second region in the axial direction of the paper feed roller is 0.5 mm or more, and 0.
It is preferably 75 mm or less. By setting the above difference in this way, it becomes possible to carry out the separation of the paper with high accuracy, without the occurrence of paper breakage, and with suppressing the generation of paper dust.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments and examples of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments and examples are merely examples embodying the present invention and are not of the nature to limit the technical scope of the present invention. Here, FIG. 1 is a schematic configuration diagram of a separating and feeding device according to an embodiment of the present invention, and FIG. 2 is a first embodiment diagram and diagram of a separating pad and a feeding roller according to an embodiment of the present invention. 3 is a second embodiment of the separating pad and sheet feeding roller according to the embodiment of the present invention, and FIG. 4 is a performance comparison diagram with respect to the items required for the separating sheet feeding device with the conventional separating sheet feeding device. is there.

The separating and feeding apparatus A according to the embodiment of the present invention shown in FIG. 1 includes a sheet feeding cassette 1, a feeding roller 2,
The paper feed roller 3, the separation pad 4 having the friction member 4b formed on the base substrate 4a, the urging spring 7 for urging the separation pad 4 toward the paper feed roller 3, and the registration roller 5. It is roughly configured. First, a structure for supplying a sheet to an image forming unit (not shown) provided downstream of the registration roller 5 will be described. Here, a plurality of sheets are stacked and stored in the sheet feeding cassette 1. Then, the attracting roller 2 comes into contact with the upper surface of the paper stored in the paper feed cassette 1 and takes out the paper by the frictional force generated by the rotation. Next, when the paper feed roller 3 rotates, the paper taken out by the take-in roller 2 is conveyed to the registration roller 5 arranged further downstream. At the same time, the handling pad 4
Of the two or more sheets of paper caught between the friction member 4b and the paper feed roller 3 by being urged by the spring 7 toward the paper feed roller 3 and pressed against each other. While the contacting sheet is blocked by the friction member 4b, only one sheet closest to the sheet feeding roller 3 is separated from the blocked sheet and sent out. Finally, the sheet is separated into sheets, and the leading end position is adjusted by the registration roller 5, and then the sheet is supplied to the image forming unit.

Next, referring to FIG. 2, in the separating and feeding apparatus B according to the first embodiment of the present invention, the feeding roller 3 is made of a deformable elastic material, and the friction member is used. Four
When b is divided into a first friction member 4c provided at the center of one surface of the base substrate 4a and a second friction member 4d exposed on both sides of the first friction member 4c and having a higher friction coefficient than the first friction member. Will be described. Here, the first friction member 4c contacts the paper feed roller 3d with respect to the second friction member 4d so that the second friction member 4d contacts the paper feed roller 3 at a pressure lower than that of the first friction member 4c. A step is formed to project in the direction. The first friction member 4c and the second friction member 4d are provided on one surface of a common base substrate 4a that is elastically biased by the biasing spring 7 toward the paper feed roller 3. As a result, the base plate 4a is urged by the urging spring 7, whereby the first friction member 4c presses while deforming the sheet feeding roller 3 made of an elastic material, and Friction member 4d
Can contact the paper feed roller 3 at a pressure lower than that of the first friction member 4c. That is, the sheet conveyed from the upstream portion is pressed against the sheet feeding roller 3 by the first friction member 4c, is sent out by the frictional force generated between the sheet feeding roller 3 and the sheet, and is also double-fed. Second contacting with the minimum pressure required to separate the sheets
It is separated by the frictional force generated between the friction member 4d and the paper. Further, even when there is no sheet to be conveyed and the sheet feeding roller 3 is in contact with the friction member 4b and is spinning,
Since the second friction member 4c is in contact with the paper feed roller with a low pressure, unnecessary wear of the paper feed roller 3, or the second friction member 4c can be prevented. As described above, in the structure according to this embodiment, the feeding of the sheet and the separation of the sheet are brought into contact with the first friction member 4c which is brought into pressure contact with the second friction member 4c which is brought into contact with the second friction member 4c with a low pressure.
Since the friction member 4d has a structure in which the roles are shared, it is possible to reliably realize the sheet separation and conveyance with a simpler structure than the conventional structure.

Next, referring to FIG. 3, there is shown a separating and feeding device C according to a second embodiment of the present invention, in which the second friction member 4 is used.
As an example of the separating and feeding device in which d ′ is provided with a predetermined gap with respect to the feeding roller 3 ′, a portion of the feeding roller 3 ′ facing the second friction member 4d ′ is fed. A configuration in which the radius of the paper roller 3'is smaller than that of the portion of the paper roller 3'that is in pressure contact with the first friction member 4c 'will be described. In this configuration, the portion of the paper feed roller 3'facing the second friction member 4d 'is formed with a smaller radius than the portion of the paper feed roller 3'pressing against the first friction member 4c', and the second friction The member 4d 'forms a step c protruding from the first friction member 4c' in the direction of the paper feed roller 3 '. Further, similar to the first embodiment, the first friction member 4c 'and the second friction member 4d' are provided on one surface of the common base substrate 4a, and are biased by the biasing spring 7 in the sheet feeding roller direction. It is energized. As a result, the first friction member 4c 'can be pressed against the paper feed roller 3', and the second friction member 4d 'can have a predetermined gap b with respect to the paper feed roller 3'. That is, the sheet conveyed from the upstream portion is pressed against the sheet feeding roller 3'by the first friction member 4c ', is fed out by the frictional force generated between the sheet feeding roller 3'and the sheet, and is also a predetermined amount. By being provided with a gap, it is separated by the frictional force generated between the second friction member 4d ′ that comes into contact with the paper at a low pressure and the paper. Here, the predetermined gap may be adjusted so that the frictional force generated between the second friction member 4d ′ and the sheet becomes a minimum frictional force that separates the sheets that are being double-fed. desirable.
In the state where there is no sheet to be conveyed and the paper feed roller 3'is in contact with the friction member 4b 'and idles,
Since the friction member 4c 'has a structure having a predetermined gap with respect to the paper feed roller, it is possible to prevent abrasion of the paper feed roller 3'or the second friction member 4c'. In this way, as in the case of the first embodiment, the second friction member 4c that presses and feeds the sheet and separates the sheet is provided with a predetermined gap.
Since the structure is such that the friction member 4d shares the role, the same function can be realized with a simpler structure than the conventional structure. In this case, the second friction member 4d ′ is the paper feed roller 3 ′.
Of the small-diameter portion and the large-diameter portion can be formed from a portion inside by a predetermined value a in the axial direction of the paper feed roller 3'and thus formed by the second friction member 4d '. A structure having a clearance of width a between the convex portion and the small diameter portion of the sheet feeding roller 3'may be used. As a result, when the sheets are separated or conveyed, the sheets are not rubbed by the friction member 4b '.
It is possible to prevent the sheet from being folded due to being sandwiched between the step formed by the sheet feeding roller 3'and the step. In the present embodiment, the second friction member 4
Although the friction member 4b 'is formed in a convex shape by forming d'in the central portion and the paper feed roller 3'is formed in a concave shape, the second friction member 4d' is formed at both end portions. Therefore, the friction member 4b 'may be formed in a concave shape and the paper feed roller 3'may be formed in a convex shape.

In the following, in the separating and feeding apparatus according to the embodiment of the present invention, it is possible to suppress the generation of paper dust and to exhibit a highly accurate separating performance of the paper without lowering the conveyance ability of the paper. The setting of the separation sheet feeding device will be described.
Here, FIG. 4A to FIG. 4E are the items (sheet fold, amount of paper dust generation, pull-out load) required for the separation sheet feeding device when each set value described below is changed. , Separation performance) is expressed by using a ratio (hereinafter abbreviated as a prior art ratio) to the performance of a conventional separating / feeding device. If the prior art ratio is 100 or more, the corresponding item It shows that the performance of is improved.

The set values changed in FIG. 4 are the difference value a between the length of the small diameter portion of the paper feed roller 3'and the length of the second friction member 4d 'shown in FIG. 2 friction member 4d '
The gap b between the first friction member 4 and the second friction member 4d ′.
A step c formed by projecting in the direction of the paper feed roller 3'with respect to c ', and further, the first friction member 4c shown in FIG.
A step difference d formed by projecting in the direction of the paper feed roller 3 with respect to d, and a ratio f / e of the width e of the first friction member 4c to the width f of the entire friction member. Further, the reference value used for the calculation of the ratio of the prior art is a conventional separating / feeding device in which a separating pad formed by uniformly forming a friction member 4b on a base substrate 4a is always urged toward the feeding roller 3 direction. It is the performance by. For example,
“Paper fold” is the number of folds among the fed papers after feeding 100 sheets, and 0 is the reference value. The "paper dust generation amount" is the amount of paper dust generated after feeding 500 sheets of paper,
2.5 g is the standard value. The "pull-out load" is an index showing the frictional force applied to the conveyed paper, and is 200 g.
f is a reference value. The "separation performance" is 100
The number of double-fed sheets is counted among the sheets fed after the sheet is fed, and 0 sheet is the reference value.

First, the setting of the difference value a will be considered with reference to FIG. In this figure, the ratio of the prior art is 100 or more for all the items when the difference value a is 0.5 mm or more and 0.75 mm or less. Therefore, by setting the difference value a to a value within the above range, it is possible to perform highly accurate paper separation while suppressing the generation of paper dust. Similarly, by using FIG. 4B, it can be said that the preferable setting of the gap b is 50 μm or more and 150 μm or less. Similarly, by using FIG. 4C, it is found that the preferable setting of the step c is 0.5 mm or more and 1.0 mm or less. Similarly,
By using FIG. 4D, the preferred setting of the step d is 10
It can be seen that it is 0 μm or less. Similarly, by using FIG. 4E, it can be said that the preferable setting of the ratio f / e is 1/3 or less.

[0016]

As described above, the present invention comprises the paper feed roller, and the friction member which is arranged so as to face the paper feed roller and is applied with a pressing force in the direction of the paper feed roller. In the separation sheet feeding device, the first friction member, in which the friction member is pressed against the sheet feeding roller, and the first friction member,
It has a friction coefficient higher than that of the friction member and is provided in contact with the paper feed roller at a pressure lower than that of the first friction member, or provided with a predetermined gap with respect to the paper feed roller. A second friction member, wherein both the first friction member and the second friction member are provided on one surface of a base substrate elastically biased toward the paper feed roller. It is configured as a paper feeding device. With such a configuration, the first friction member, which is mainly for the purpose of conveying the paper, is pressed against the paper feed roller to ensure the paper conveying ability, and is mainly for separating the paper. The second friction member is provided in contact with the paper feed roller at a low pressure, or is provided with a predetermined gap with respect to the paper feed roller without deteriorating the separation performance of the paper.
It is possible to prevent the generation of paper dust or to prolong the service life of the paper feed roller and the friction member by reducing only the conveyance load that hinders the conveyance of the paper. Further, since this structure has a simple structure based on the conventional structure, no inconvenience occurs in terms of manufacturing cost and downsizing. Further, it is desirable that the first friction member is formed in a region of 1/3 or less of the entire friction member. By forming the first friction member in this way, it becomes possible to perform the separation of the paper with high accuracy while suppressing the generation of paper dust.

Further, the feed roller is made of a deformable elastic material, and the second friction member is brought into contact with the feed roller at a pressure lower than that of the first friction member. However, the first friction member may be formed with a step projecting toward the paper feed roller with respect to the second friction member. With this configuration,
The friction member has a structure in which a first friction member that carries a sheet is brought into pressure contact with a paper feed roller, and a second friction member that is taken out from a paper is brought into contact with a paper feed roller at a low pressure. Is possible. Therefore, as compared with the conventional separating / feeding device that separates the paper by rubbing the paper with the entire friction member that is pressed with high pressure, the paper is rubbed with the second friction member that is contacted with low pressure. Since the paper is separated by this, it is possible to suppress the generation of paper dust and reduce the carrying load. For example, the step difference is preferably 100 μm or less. By setting the step as described above, it becomes possible to perform the separation of the paper with high accuracy while suppressing the generation of paper dust.

Further, the second friction member is configured to have a predetermined gap with respect to the paper feed roller, and the portion of the paper feed roller facing the second friction member is the paper feed roller. It may be formed with a smaller radius than the portion of the first friction member that is in pressure contact with. With this configuration, the friction member is configured such that the first friction member that carries the sheet is brought into pressure contact with the paper feed roller, and the second member that separates the sheet is provided.
It is possible to provide a structure in which the friction member is provided on the paper feed roller with a predetermined gap. Therefore, in comparison with the conventional separating / feeding device that separates the paper by rubbing the paper with the entire friction member that is pressed with a high pressure, the second friction member that has a predetermined gap is provided. Since the paper is separated by rubbing the paper, it is possible to suppress the generation of paper dust and reduce the transport load. For example, the gap between the paper feed roller and the second friction member is preferably 50 μm or more and 150 μm or less. By setting the above-mentioned gap or step in this way, it becomes possible to carry out the separation of the paper with high accuracy while suppressing the generation of paper dust.

Further, the second friction member is configured to have a predetermined gap with respect to the paper feed roller, and the second friction member is further provided in the paper feed roller direction with respect to the first friction member. A protruding step may be formed. With this configuration, it is possible to set a predetermined gap between the second friction member and the paper feed roller and arbitrarily change the radius of the portion of the paper feed roller that faces the second friction member. For example, as compared with the case where a friction member formed in a flat shape is applied by forming the step between the second friction member and the first friction member to be 0.5 mm or more and 1.0 mm or less, Furthermore, it becomes possible to perform highly accurate separation of paper while suppressing the generation of paper dust.

Further, the second friction member is configured to have a predetermined gap with respect to the paper feed roller, and the second friction member is formed by a small radius of the paper feed roller. It may be formed smaller by a predetermined value in the axial direction of the paper feed roller. With this configuration, when the paper is separated or conveyed, it is possible to prevent the paper from being folded due to being pinched by the step formed by the friction member and the paper feed roller. Become. For example, the difference between the second friction member and the second area in the paper feed roller axial direction is 0.5 mm or more and 0.75 mm.
The following is desirable. By setting the above difference in this way, it becomes possible to carry out the separation of the paper with high accuracy, without the occurrence of paper breakage, and with suppressing the generation of paper dust.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a separation sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a first example view of a separating pad and a sheet feeding roller according to the embodiment of the invention.

FIG. 3 is a second example view of a separating pad and a sheet feeding roller according to the embodiment of the invention.

FIG. 4 is a performance comparison chart with respect to items required for a separation sheet feeding device and a conventional separation sheet feeding device.

[Explanation of symbols]

A ... Separation / Sheet Feeder B ... Separation / Sheet Feeder C ... Separation / Sheet Feeder 1 ... Sheet Feeding Cassette 2 ... Invitation Roller 3 ... Sheet Feeding Roller 3 ′ ... Sheet Feeding Roller 3a ′ ... Step portion 4 with large-diameter portion ... Separation pad 4a ... Base substrate 4b ... Friction member 4c ... First friction member 4c '... First friction member 4d ... Second friction member 4d' ... Second friction member 5 ... Registration roller 7 ... Energizing spring a ... Difference between the length of the region formed by the small radius of the paper feed roller 3 and the length of the second friction member 4d b ... Gap amount c between the paper feed roller 3 and the second friction member 4d The step height d formed by the second friction member 4d with respect to the first friction member 4c. The step height e formed by the first friction member 4c with respect to the second friction member 4d. Width f of member 4c ... Width of entire friction member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideki Goto             22-22 Nagaike, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka             Group Co., Ltd. (72) Inventor Yuhi Akagawa             22-22 Nagaike, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka             Group Co., Ltd. (72) Inventor Yoshihiro Shiraishi             22-22 Nagaike, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka             Group Co., Ltd. (72) Inventor Yasuji Yamaji             22-22 Nagaike, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka             Group Co., Ltd. F-term (reference) 3F343 FA02 FB02 FB03 FC01 GA02                       GB01 GC01 GD01 HB03 JA02                       JD08 JD31 JD33 KB05 KB17                       LA04 LB08

Claims (10)

[Claims] 1. A separation sheet feeding device comprising: a sheet feeding roller; and a friction member that is arranged so as to face the sheet feeding roller and is applied with a pressing force in the direction of the sheet feeding roller. The friction member has a friction coefficient higher than that of the first friction member pressed against the paper feed roller and the first friction member, and is lower than the first friction member against the paper feed roller. A second friction member that is provided in contact with or is provided with a predetermined gap with respect to the paper feed roller, wherein the first friction member and the second friction member are both A separate sheet feeding device, which is provided on one surface of a base substrate elastically urged toward. 2. The separation sheet feeding device according to claim 1, wherein the first friction member is formed in a region of 1/3 or less of the entire friction member. 3. The paper feeding roller is made of a deformable elastic material, and the second friction member is in contact with the paper feeding roller at a pressure lower than that of the first friction member. 3. The separation sheet feeding apparatus according to claim 1, wherein the first friction member forms a step projecting toward the sheet feeding roller with respect to the second friction member. apparatus. 4. The separation sheet feeding device according to claim 3, wherein the step is 100 μm or less. 5. The separation paper feeding device, wherein the second friction member has a predetermined gap with respect to the paper feeding roller,
The portion of the paper feed roller facing the second friction member is
2. The separation sheet feeding device according to claim 1, wherein the sheet feeding roller is formed with a radius smaller than a portion of the sheet feeding roller that is in pressure contact with the first friction member. 6. The separation sheet feeding device, wherein the second friction member has a predetermined gap with respect to the sheet feeding roller,
The separation sheet feeding device according to claim 5, wherein the second friction member forms a step projecting toward the sheet feeding roller with respect to the first friction member. 7. The separation paper feeding device, wherein the second friction member has a predetermined gap with respect to the paper feeding roller,
7. The separation sheet feeding device according to claim 6, wherein the second friction member is formed smaller than a portion formed by the small radius of the sheet feeding roller in the axial direction of the sheet feeding roller by a predetermined value. 8. The gap is 50 μm or more and 15
The separation sheet feeding device according to claim 5, which has a thickness of 0 μm or less. 9. The separation sheet feeding device according to claim 6, wherein the step is 0.5 mm or more and 1.0 mm or less. 10. The separation sheet feeding device according to claim 7, wherein the value is 0.5 mm or more and 0.75 mm or less.