JP3437258B2 - Paper feeder - Google Patents

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.

[0002]

2. Description of the Related Art Generally, a recording apparatus such as a facsimile machine separates a plurality of stacked sheets from each other and feeds them into the apparatus, for example, as shown in FIG. It is equipped with a device.

Now, the paper feeding device shown in FIG. 5 will be described. In the figure, the sheets (not shown) stacked on the sheet stacking table 1 are pressed by a sheet pressing spring 3 which is a sheet pressing member, and are arranged in the opening of the sheet stacking table 1, and are made of rubber, for example. Formed rotating feeding roller 2
The sheet is pressed against the feeding surface of the sheet, and the lower the sheet, the more the sheet is advanced to the contact portion between the separation pad 5 and the conveying roller 7.

The separation pad 5 is made of urethane, for example, and is mounted on a holder 4 which is rotatably supported, and is pressed by a leaf spring 6 to a conveying surface of a conveying roller 7 made of rubber, for example. Further, regarding the relationship of the mutual friction coefficient between the separation pad 5, the paper, and the conveyance roller 7, the friction coefficient between the separation pad 5 and the paper is M2, the friction coefficient between the papers is M1, and the paper and the conveyance roller 7 are. The friction coefficient of M3 is M3, and the relationship is M1 <M2 <M3.

Then, the sheet fed into the abutting portion receives the restoring force of the leaf spring 6 and the friction coefficients M1, M2, which are exerted when the sheet bites into the abutting portion as the conveying roller 7 rotates. Due to the difference in each frictional force generated according to M3, the sheets are separated and conveyed one by one.

The sheet separated into one sheet is further conveyed by a conveying roller 8 made of, for example, rubber, which is in contact with the image information reading section 9, and the image information reading section 9 reads the image information on the sheet.

Further, in a recording apparatus such as a facsimile apparatus, a sheet feeding apparatus as shown in FIG. 6 is often used in order to separate and convey the accumulated sheets one by one from the top.

Now, the paper feeding device shown in FIG. 6 will be described. As shown in FIG.
A pressing plate 13 rotatably supported is provided on a spiral spring 12 which is a press-contact means mounted on the bottom surface of the tip end portion thereof.
A large number of sheets of paper 11 accumulated on the pressing plate 13 are stored. The sheet 11 that is going to rise due to the restoring force of the spiral spring 12 is locked by the separation claws 15 provided at the left and right corners of the front end of the storage cassette 10, and is conveyed by the conveyance roller 14 formed of, for example, rubber. It is pressed against the surface.

Then, the rotating conveying roller 14 and the sheet 1
A frictional force corresponding to the friction coefficient between them and the load acts between the uppermost sheet 11a of the sheet 11a and the sheet 11a,
The separation claw 15 separates and conveys the sheet 11 below the second sheet.

[0010]

However, these conventional sheet feeding devices have the following inconveniences.

That is, the sheet feeding device shown in FIG. 5 needs to satisfy the relationship of M1 <M2 <M3,
The larger the difference between M1, M2, and M3 is, the more difficult it is for so-called double feeding, in which several sheets of paper are conveyed while being stacked, which is desirable. However, the minimum friction coefficient M1
Is a coefficient of friction between sheets, which is, so to speak, a condition given regardless of the sheet feeding device.

Therefore, in order to increase the difference between the frictional coefficients, M3 may be increased or M2 may be increased. However, since there is a condition of M2 <M3, when M2 is increased, M3 is also increased. Therefore, it must be large enough. Increasing M3 means using a material having a large coefficient of friction with the paper as the conveying roller 7. However, it is difficult to dramatically increase the coefficient of friction with the paper as compared with the conventional materials.

Further, in order to reliably feed the overlapped sheets, it is necessary to press the sheets against the feeding roller 2 by the sheet pressing spring 3 in order to generate a frictional force between the feeding roller 2 and the sheet. However, due to the nature of the frictional force, the force with which the paper pressing spring 3 presses the paper must be increased in order to secure the feeding force. However, when the pressing force increases, the frictional force acting between the sheets also increases, and the stacked sheets are not fed out and are easily sent to the abutting portion.

On the other hand, in order to literally feed the overlapped sheets, it is necessary to reduce the force with which the sheet pressing spring 3 presses the sheets. However, if the pressing force becomes small, the feeding force also decreases, and the feeding roller 2 idles and cannot be fed.

In order to solve these contradictory problems, it is sufficient to use the feeding roller 2 having a sufficiently large coefficient of friction with the sheet, but this is difficult as in the case of the conveying roller 7.

Further, in the paper feeding device shown in FIG. 6, due to the nature of the frictional force, in order to secure the carrying force, the carrying roller 1
It is necessary to increase the force with which 4 presses the uppermost sheet 11a. However, the pressing force is caused by the conveyance roller 14 and the sheet 1.
It acts not only between 1a and 1a, but also on the sheet 11 below the second sheet. Therefore, if an attempt is made to secure the conveying force, the frictional force acting between the sheets also increases, and thus double feeding easily occurs.

On the other hand, in order to prevent double feeding, the force with which the conveying roller 14 presses the uppermost sheet 11a may be reduced.
However, in this case, the carrying force becomes weaker this time, and the carrying roller 14 idles and cannot be carried.

In order to solve these contradictory problems, it suffices to use the conveying roller 14 having a sufficiently large coefficient of friction with the sheet, but it is difficult as in the sheet feeding device shown in FIG.

Further, not limited to those shown in FIGS.
A paper feeding device that conveys paper by friction has the same problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sheet feeding device which is unlikely to cause double feeding and which can reliably convey sheets.

[0021]

In order to achieve the above object, a sheet feeding device according to a first aspect of the present invention feeds stacked sheets by a feeding roller and a sheet pressing member, and conveys the fed sheets. A roller and a separation pad that is pressed against the roller are conveyed separately, and the delivery surface of the delivery roller is formed of an adhesive material having a predetermined adhesive force, and the delivery surface of the delivery roller is set to a predetermined size. On the other hand, while having a cleaning surface formed of an adhesive material having an adhesive strength higher than the predetermined adhesive strength of the feeding surface and the conveying surface, the cleaning surface is formed by the adhesive material having the adhesive force of It is characterized in that it is provided with a cleaning roller arranged in contact with the surface.

According to a second aspect of the present invention, in the sheet feeding device, the stacked sheets are fed by the belt wound around the conveying roller and the feeding roller and the sheet pressing member, and the fed sheet is the belt. Separately conveyed with a separation pad pressed against it, the outer surface of the belt is formed of an adhesive material having a predetermined adhesive force, and the adhesive force is stronger than the predetermined adhesive force of the outer surface of the belt. The cleaning roller is provided with a cleaning surface formed of an adhesive material having a cleaning roller, and the cleaning surface is provided in contact with the outer surface of the belt.

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

According to the structure of claim 1, the feeding surface is
Since the sheet is formed of an adhesive material having a predetermined adhesive force, the feeding force is sufficiently large even if the force with which the sheet pressing member presses the sheet is weak due to the nature of the adhesive force. If the pressing force is weak, the force acting between the sheets is weak. Further, since the transport surface is formed of an adhesive material having a predetermined adhesive force, the transport force is sufficiently large even if the force of pressing the separation pad against the transport roller is weak. That is, equivalently, the coefficient of friction between the sheet and the carrying roller becomes very large. If the pressing force is weak, the force acting between the sheets is weak. Further, since the cleaning roller is provided, dust such as paper dust attached to the conveying surface and the feeding surface moves to the cleaning surface side having a stronger adhesive force than the conveying surface and the feeding surface. Further, the cleaning roller also serves as an idle wheel that rotates the transport roller and the feeding roller in the same rotation direction.

According to the second aspect of the invention, since the outer surface of the belt is formed of an adhesive material having a predetermined adhesive force, the force of the paper pressing member to press the paper is weakened due to the nature of the adhesive force. However, the feeding force is sufficiently large. Further, even if the force for pressing the separation pad against the conveying roller is weak, the conveying force is sufficiently large. That is, equivalently, the coefficient of friction between the sheet and the carrying roller becomes very large. If the pressing force is weak, the force acting between the sheets is weak. Further, since the cleaning roller is provided, dust such as paper dust attached to the outer surface of the belt moves to the cleaning surface side, which has a stronger adhesive force than the outer surface of the belt.

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings referred to in the following description, the same parts and corresponding parts as those in FIGS. 5 and 6 showing an example of a conventional sheet feeding device are designated by the same reference numerals.

First, a first embodiment of the paper feeding device of the present invention will be described with reference to FIG. In FIG.
The separation pad 5 is made of urethane, is attached to a holder 4 that is rotatably supported, and is pressed against a conveyance surface 7 a of a conveyance roller 7 by a leaf spring 6.

A double-sided tape is attached to the transport surface 7a. This double-sided tape has a strong adhesive force on the surface that is adhered to the conveying roller 7, and a weak adhesive force on the side that is exposed to the outside. A double-sided adhesive tape is also applied to the delivery surface 2a of the delivery roller 2 as in the case of the transport surface 7a, where the adhesive side is strong and the exposed side is weak.

A double-sided tape is also attached to the cleaning surface 16a of the cleaning roller 16 like the feeding roller 2. However, the adhesive force on the side exposed to the outside of the double-sided tape is much stronger than the adhesive force on the side exposed to the outside of the transport surface 7a and the feeding surface 2a.

The transport roller 7, the cleaning roller 16 and the payout roller 2 are pivotally supported by the bracket 17 in an arrangement such that the cleaning surface 16a is in contact with the transport surface 7a and the payout surface 2a.

The sheets (not shown) stacked and set on the sheet stacking table 1 are the sheet pressing springs 3 which are sheet pressing members.
Is weakly pressed by and is pressed against the feeding surface 2a of the feeding roller 2 which is arranged in the opening of the sheet stacking table 1 and rotates.
The lower the sheet is, the more the sheet tends to be advanced, and the sheet is fed to the contact portion between the separation pad 5 and the conveying roller 7 with a large feeding force due to the adhesive force. Then, the fed-in paper bites into the contact portion by the rotation of the transport roller 7. At this time,
Since the force of pressing the sheets by the sheet pressing spring 3 is weak, the force acting between the sheets is weak, and an appropriate amount of sheet is fed into the contact portion.

Here, the relationship between the friction coefficient and the adhesive force between the separation pad 5, the paper and the conveying roller 7 is as follows: the friction coefficient between the separation pad 5 and the paper is M2, and the friction coefficient between the papers is M1. Then, the relationship of M1 <M2 is satisfied. Further, since the adhesive force between the paper and the carrying roller 7 is different from the frictional force in nature, the friction coefficient cannot be defined, but equivalently, it is considered that the friction coefficient between the paper and the carrying roller 7 is extremely large. be able to. Therefore, when the equivalent friction coefficient between the sheet and the transport roller 7 is set to M3, M1 <M2
<The relationship of M3 is satisfied.

Then, the restoring force of the leaf spring 6 acting by the paper biting into the contact portion and the friction coefficients M1 and M2.
And due to the mutual difference of the frictional force and the adhesive force generated according to the equivalent friction coefficient M3, the overlapped sheets are conveyed by the conveyance roller 7
Thus, the sheets are separated one by one at the contact portion while being surely conveyed by a large conveying force due to the adhesive force. Further, since M3 is very large, the difference from M2 is also large, and double feeding of paper is much less likely to occur than in the conventional case.

The sheet separated into one sheet is made of rubber and further conveyed by the conveying roller 8 which is in contact with the image information reading section 9, and the image information of the sheet is read by the image information reading section 9. However, since the transport surface 7a is weak but sticky, it is unlikely to occur, but in consideration of the fact that the sheet to be transported is not peeled from the transport surface 7a and is wound around the transport roller 7. In this embodiment, a guide plate 18 is provided as shown in FIGS. 1A and 1B in order to guide the sheet to be wound around the conveying roller 7 to the original conveying path. .

As described above, according to this embodiment, the transport surface 7
Since the a and the feeding surface 2a have adhesiveness, double feeding of the paper is unlikely to occur and reliable feeding can be performed, while the cleaning surface 16a of the cleaning roller 16 has the conveying surface 7a that abuts against it.
Also, since it has a much stronger adhesive force than the adhesive force on the side exposed to the outside of the feeding surface 2a, dust such as paper dust adhering to the conveying surface 7a and the feeding surface 2a moves to the cleaning surface 16a side, and the conveying surface 7a And the adhesive force of the feeding surface 2a continues.

However, the adhesion of the cleaning surface 16a is gradually weakened by taking in dust. If it becomes weaker than the adhesive force of the conveying surface 7a and the feeding surface 2a, the cleaning ability is no longer present and the adhesive force of the conveying surface 7a and the feeding surface 2a cannot be maintained. Therefore, it is necessary to recover the adhesive force of the cleaning surface 16a of the cleaning roller 16, but since the double-sided tape is used in the present embodiment, the adhesive force can be recovered simply by replacing the tape.

To replace the tape, the cleaning roller 16
1 must be removed from the bracket 17, as shown in FIG.
As shown in (c) and (d), the transport roller 7 is
The bracket 17 is fixed to a shaft 7b that transmits a driving force for rotating the same, and the bracket 17 is attached to the shaft 7b at a position in contact with both ends of the transport roller 7. The delivery roller 2 is pivotally supported by the bracket 17. The cleaning roller 16 is detachably supported by a bracket 17. The bracket 17 is made of elastic plastic and can be bent to some extent. Therefore, the bracket 17
The cleaning roller 16 can be easily reattached by bending the portion supporting the cleaning roller 16 to the outside and removing the cleaning roller 16.

Further, in the case of rollers made of rubber or the like, the power transmission is due to frictional force, so the rollers tend to run idle unless the rollers are firmly pressed. However, since each roller of this embodiment has an adhesive surface, It suffices if the surfaces come into light contact with each other, and such pressing is unnecessary.

The feeding roller 2 and the paper pressing spring 3
Is provided when the number of sheets set at one time in the sheet feeding device is large. If the number of sheets set at one time is not large (for example, about 5 sheets), it is not provided. can do.

Alternatively, the cleaning roller 16 may be omitted. However, since the cleaning roller 16 is not provided, dust adhering to the transport surface 7a and the feeding surface 2a remains attached, so that the double-sided tape attached to the side surfaces of the transport roller 7 and the feeding roller 2 is frequently replaced. Or need cleaning. Further, since the cleaning roller 16 also serves as an idler for rotating the transport roller 7 and the feeding roller 2 in the same rotation direction, it is necessary to separately provide power transmission means.

Next, a second embodiment of the paper feeding device of the present invention will be described with reference to FIG. In the figure, a belt 19 is wound around the conveying roller 7 and the feeding roller 2. The cleaning surface 16a of the cleaning roller 16 is a belt 19
Is abutted on the outer surface of. The transport roller 7, the feeding roller 2, and the cleaning roller 16 are pivotally supported by a bracket (not shown).

A double-sided tape is attached to the outer surface of the belt 19. This double-sided tape has a strong adhesive force on the surface bonded to the belt 19 and a weak adhesive force on the exposed side.

A double-sided tape is also attached to the cleaning surface 16a of the cleaning roller 16 like the belt 19. However,
The adhesive force on the outside exposed side of the double-sided tape is much stronger than the adhesive force on the outside exposed side of the belt 19.

Although the feeding roller 2 may have a circular cross section, it has a cross section in which the corners of the quadrangle are chamfered in order to pulsate the feeding force and effectively feed the paper. .

The separation pad 5 is made of urethane, is mounted on a holder 4 which is rotatably supported, and is pressed against a portion of the belt 19 wound around the conveying roller 7 by a leaf spring 6.

The sheets stacked on the sheet stacking table 1 are weakly pressed by the sheet pressing spring 3 which is a sheet pressing member, and abut on the portion of the belt 19 wound around the feeding roller 2. By being pressed into contact with the chamfered portion of the rotating feeding roller 2, the lower sheet is tended to advance, and is fed to the contact portion between the separation pad 5 and the belt 19 with a large feeding force due to the adhesive force. Then, the fed-in paper bites into the contact portion by the rotation of the transport roller 7. At this time, since the force of pressing the paper by the paper pressing spring 3 is weak, the force acting between the papers is weak, and an appropriate amount of paper is fed into the contact portion.

The relationship between the friction coefficient and the adhesive force between the separation pad 5, the paper, and the belt 19 is as follows: the friction coefficient between the separation pad 5 and the paper is M2, and the friction coefficient between the papers is M.
When set to 1, the relationship of M1 <M2 is satisfied. In addition, since the adhesive force between the paper and the belt 19 is different from the frictional force,
Although the coefficient of friction cannot be defined, it can be considered equivalently that the coefficient of friction between the paper and the belt 19 has become extremely large. Therefore, if the equivalent friction coefficient between the paper and the belt 19 is set to M3, the relationship of M1 <M2 <M3 is satisfied.

Then, the restoring force of the leaf spring 6 that acts by the paper biting into the contact portion and the friction coefficients M1 and M2.
And due to the mutual difference between the frictional force and the adhesive force generated according to the equivalent friction coefficient M3, the overlapped sheets are surely conveyed by the belt 19 with a large conveying force due to the adhesive force, and one by one at the contact portion. To be separated. Further, since M3 is very large, the difference from M2 is also large, and double feeding of paper is much less likely to occur than in the conventional case.

The sheet separated into one sheet is made of rubber and further conveyed by the conveying roller 8 which is in contact with the image information reading section 9, and the image information on the sheet is read by the image information reading section 9. However, since the outer surface of the belt 19 is weak but sticky, it is unlikely that the outer surface of the belt 19 will be conveyed.
In consideration of sticking to the outer surface of the belt 19 without being peeled off from the outer surface of the sheet, in this embodiment, in order to guide the sheet to be stuck to the outer surface of the belt 19 to the original transport path, A guide plate 18 is provided as in the first embodiment.

As described above, according to this embodiment, the belt 1
Since the outer surface of 9 has adhesiveness, double feeding of paper is unlikely to occur and reliable paper feeding is possible. In addition, the cleaning roller 16
The cleaning surface 16a of the belt 1 has a much stronger adhesive force than the adhesive force of the outer surface of the belt 19 abutting the cleaning surface 16a.
Dust such as paper dust attached to the outer surface of 9 moves to the cleaning surface 16a side, and the adhesive force of the outer surface of the belt 19 continues.

However, if the adhesive force of the cleaning surface 16a is gradually weakened by taking in dust and becomes weaker than the adhesive force of the outer surface of the belt 19, the cleaning ability is no longer present and the adhesive force of the outer surface of the belt 19 cannot be maintained. . Therefore, it is necessary to recover the adhesive force of the cleaning surface 16a of the cleaning roller 16, but since the double-sided tape is used in the present embodiment, the adhesive force can be recovered simply by replacing the tape.

In this embodiment, the cleaning roller 16 may be omitted. However, cleaning roller 1
Since there is no 6, the dust attached to the outer surface of the belt 19 remains attached, and therefore the double-sided tape attached to the outer surface of the belt 19 needs to be frequently replaced or cleaned.

Next, a third embodiment of the present invention will be described with reference to FIG. The configuration of this embodiment is exactly the same as that of the first embodiment. However, as shown in FIG.
The double-sided tape 20 is attached on the separation pad 5 in the vicinity of the contact portion between the separation pad 5 and the transport roller 7. This double-sided tape has a strong adhesive force on the surface bonded to the separation pad 5, and a weak adhesive force on the side exposed to the outside.

Before explaining the operation of this embodiment, FIG.
The inconvenience shown in (c), in which the double-sided tape 20 is not attached to the separation pad 5, will be described. Originally, the overlapped sheets P1 to P4 fed into the contact portion between the separation pad 5 and the transport roller 7 should have a tendency to advance toward the lower side. Due to the relationship of the friction coefficient between the transport roller 7 and the paper, the paper is double-fed. Further, the situation in which the upper side comes first often occurs when the sheets are not well aligned. In this case, in the case shown in FIG. 3C, since the paper P3 preceding the lower paper P2 does not work even if it abuts the separation pad 5,
The paper P2 bites into the abutting portion while preceding the paper P2. This is because the frictional force is not generated unless a load is applied, and the load is generated only when it bites into the contact portion. Then, the sheet P3 which has been bitten into the abutting portion as it is ahead is no longer overlapped with P2.

On the other hand, according to the present embodiment, as shown in FIG. 3B, the overlapped sheets fed into the abutting portion have the adhesive property of the upper sheets P3 and P4. Therefore, the tape 20 is locked by only abutting lightly on the tape 20 without biting into the abutting portion. On the other hand, the lower sheets P1 and P
2 does not contact the tape 20 and bites into the contact portion. Then, the sheets are separated and conveyed one by one. Further, since the adhesive force on the side exposed to the outside of the tape 20 is weak, the sheets P3 and P4 contacting the tape 20 do not remain stuck as they are. As the sheets P1 and P2 are sequentially conveyed, they are lowered downward.

As described above, according to the present embodiment, even if the upper side sheet slightly precedes the lower side sheet, the lower side tends to be corrected by contacting the tape 20. As compared with the first embodiment, double feeding becomes more difficult to occur.

The present embodiment has the same construction as that of the first embodiment and has the construction in which the tape 20 is attached to the separation pad 5. However, in the separation pad of the conventional paper feeding device as shown in FIG. The tape 20 may be attached, and even in that case, double feeding is less likely to occur as compared with the case where the tape is not attached. Further, even if the configuration is the same as that of the second embodiment and the tape 20 is attached to the separation pad 5, double feeding is less likely to occur as compared with the case where the tape 20 is not attached.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the figure, the paper storage cassette 1
0 is provided with a pressing plate 13 that is rotatably supported on a spiral spring 12 placed on the bottom surface of its tip, and accommodates a large number of sheets of paper 11 accumulated on the pressing plate 13. . The paper 11 that is going to rise due to the restoring force of the spiral spring 12
While being locked by the separation claws 15 provided at the left and right corners of the front end of the storage cassette 10, it is brought into contact with the transport surface 14 a of the transport roller 14.

A double-sided tape is attached to the transport surface 14a. This double-sided tape has a strong adhesive force on the side that is adhered to the transport roller 14, and a weak adhesive force on the side that is exposed to the outside.

A double-sided tape is also attached to the cleaning surface 21a of the cleaning roller 21 like the transport roller 14. However, the adhesive force on the outside exposed side of this double-sided tape is much stronger than the adhesive force on the outside exposed side of the transport surface 14a.

Then, the transport roller 14 and the cleaning roller 2
1 is rotatably supported and interlocked with the cleaning surface 21a being in contact with the transport surface 14a.

With the above-described structure, a large conveying force due to the adhesive force is exerted between the rotating conveying roller 14 and the uppermost sheet 11a of the sheet 11, and the sheet 11a is
The separation claw 15 separates the sheet 11 from the second sheet and below to reliably convey the sheet. Further, the transport roller 14 is the paper 1
Since it is only brought into contact with the sheet 1a, the force of the transport roller 14 pressing the sheet 11a is weak. Therefore, since the force acting between the sheets is weak, double feeding of the sheets is unlikely to occur.

The sheet separated into one sheet is conveyed by the rotating conveying roller 14, and the conveying surface 14a
Is unlikely to occur because it is weak but sticky, but the paper to be transported is
In consideration of the fact that the sheet is not peeled off from the sheet a and is wound around the conveying roller 14, the present embodiment is provided with a guide plate 22 that scrapes off the sheet to be wound around the conveying roller 14 and returns it to the original conveying path. There is.

The cleaning surface 21a of the cleaning roller 21 is
Since the adhesive force is much stronger than the adhesive force of the conveying surface 14a that abuts against it, dust such as paper dust adhering to the conveying surface 14a moves to the cleaning surface 21a side, and the adhesive force of the conveying surface 14a continues.

However, if the adhesive force of the cleaning surface 21a is gradually weakened by taking in dust and becomes weaker than the adhesive force of the transport surface 14a, the cleaning ability is no longer present and the transport surface 14a is no longer needed.
The adhesive strength of a cannot be maintained. Therefore, the cleaning surface 21
Although it is necessary to recover the adhesive strength of a, in the present embodiment,
Since the double-sided tape is used, the adhesive strength can be restored simply by replacing the tape.

In the present embodiment, the cleaning roller 21 may be omitted. However, the cleaning roller 21
Since there is no dust, dust attached to the transport surface 14a remains attached, and therefore the double-sided tape attached to the side surface of the transport roller 14 needs to be frequently replaced or cleaned.

[0076]

According to the first aspect of the invention, since the feeding surface is formed of an adhesive material having a predetermined adhesive force, the sheet pressing member weakens the force for pressing the sheet, so that the sheet can be literally fed out. . Further, since the conveying surface is formed of an adhesive material having a predetermined adhesive force, the coefficient of friction between the sheet and the conveying roller becomes equivalently large, and double feeding hardly occurs. Further, since the feeding force and the feeding force are sufficiently secured due to the property of the adhesive force, the paper is surely fed and fed.
Further, since the cleaning roller is provided, the dust adhering to the transport surface and the feeding surface can be minimized, the adhesive force on the transport surface and the feeding surface can be maintained, and the performance of the apparatus can be maintained. Further, since the cleaning roller also serves as an idle wheel that rotates the transport roller and the feeding roller in the same rotation direction, it is not necessary to separately provide power transmission means.

According to the second aspect of the invention, since the outer surface of the belt is formed of an adhesive material having a predetermined adhesive force, the force of the paper pressing member to press the paper is weakened to literally repeat the paper. In addition, the coefficient of friction between the paper and the belt becomes equivalently large, and double feeding is less likely to occur. Further, since the feeding force and the feeding force are sufficiently secured due to the property of the adhesive force, the paper is surely fed and fed. Further, since the cleaning roller is provided, the dust adhering to the outer surface of the belt can be minimized, the adhesive force on the outer surface of the belt can be maintained, and the performance of the device can be maintained.

[0078]

[0079]

[0080]

[0081]

[0082]

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a side view showing a second embodiment of the present invention.

FIG. 3 is a side view showing a third embodiment of the present invention.

FIG. 4 is a side sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a side view showing an example of a conventional paper feeding device.

FIG. 6 is likewise a side sectional view showing an example of a conventional sheet feeding device.

[Explanation of symbols]

2 Feeding roller 2a Feeding surface 3 Paper presser spring 5 Separation pad 7 Conveyor rollers 7a, 14a Transport surface 14 Conveyor rollers 16, 21 Cleaning roller 16a, 21a Cleaning surface

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-75932 (JP, A) JP-A-5-213449 (JP, A) JP-A-7-223747 (JP, A) Actual Kaihei 3- 51728 (JP, U) Actually open 61-49742 (JP, U) Actually open 57-74341 (JP, U) Actually open 2-4829 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65H 3/06 330 B65H 3/20 B65H 3/46 G03G 15/00 516

Claims (2)

(57) [Claims] 1. A paper feeding device for feeding stacked paper by a feeding roller and a paper pressing member, and feeding the fed paper separately by a feeding roller and a separation pad pressed against the feeding roller. The delivery surface of the delivery roller is formed of an adhesive material having a predetermined adhesive force, and the transport surface of the transport roller is formed of an adhesive material having a predetermined adhesive force. A sheet feeding device having a cleaning surface formed of an adhesive material having a stronger adhesive force than the adhesive force, and a cleaning roller arranged so as to abut the cleaning surface and the delivery surface and the transport surface. . 2. The stacked sheets are delivered by a belt wound around a conveying roller and a delivery roller and a sheet pressing member, and the delivered sheet is separated by the belt and a separation pad pressed against the sheet. In a paper feeding device that conveys a belt, the outer surface of the belt is formed of an adhesive material having a predetermined adhesive force, and a cleaning surface formed of an adhesive material having a stronger adhesive force than the predetermined adhesive force of the outer surface of the belt is used. A sheet feeding device having a cleaning roller having a cleaning surface abutting the outer surface of the belt.