JP3567744B2 - Paper feeder - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet feeding device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as one of paper feeding devices employed in a printer or the like, each time a paper feeding roller makes one rotation, a sheet placed at a paper feeding position is sent out one sheet at a time to a downstream side of a transport path. There is known a sheet feeding device configured so that a conveyance roller sends the sheet to a downstream side of a conveyance path.
[0003]
[Problems to be solved by the invention]
By the way, if the frictional force acting between the paper feeding roller and the paper is insufficient, the paper feeding device may cause a pick error and may not be able to properly feed the paper at the paper feeding position.
[0004]
On the other hand, if the frictional force acting between the paper feed roller and the paper is too large, when the paper feed roller rotates and the paper reaches the transport roller, the paper strongly pressed by the paper feed roller is transported by the transport roller. Forcefully pulls the paper, or conversely, the paper feed roller forcibly presses the paper against the transport roller, for example, the balance of the force relationship with the transport roller is deteriorated, and the paper being transported is inclined. Alternatively, there is a problem that the paper being transported is wrinkled.
[0005]
Therefore, conventionally, the frictional force acting between the paper feed roller and the paper is delicately adjusted so that a pick error does not occur and the paper being transported is not tilted or wrinkled. However, such adjustment is extremely difficult, and in some cases, the above-mentioned problems cannot be sufficiently improved.
[0006]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a sheet feeding device that does not cause a pick error and that does not cause skew or wrinkles in a sheet being conveyed. It is in.
[0007]
Means for Solving the Problems and Effects of the Invention
In order to achieve the above-mentioned object, the present invention provides, as set forth in claim 1,
When driven to rotate, the paper is rotated while the outer peripheral portion is in contact with the surface of the paper placed at the paper feed position, and each time the paper makes one rotation, the paper is moved one sheet at a time from the paper feed position to the downstream side of the transport path. A feed roller that feeds the paper, and a feed roller that rotates while bringing the outer peripheral portion into contact with the surface of the paper sent from the upstream side of the feed path by the feed roller and feeds the paper further to the downstream side of the feed path. Paper feeder with
The paper feed roller is always in a first state in which it is stationary at a first rotation angle and does not hinder the displacement of the sheet, and reaches a second rotation angle when it is driven to rotate and makes one rotation. And a second state in which a conveying force is applied to the sheet, and then, when the third rotation angle is reached, a third state in which a smaller conveying force is applied to the sheet than in the second state. followed become fourth again the first state reaches the rotation angle of, then the first is configured as a still that led to the rotational angle, moreover, different positions for the axial as the center of rotation A plurality of contact portions in contact with the paper in the structure,
A first contact portion that contacts the sheet from the second rotation angle to the fourth rotation angle when the plurality of contact portions are rotated and driven to make one rotation; and A second contact portion that contacts the sheet from the rotation angle to the third rotation angle is formed .
[0008]
In this paper feeder, the paper feed roller applies a conveying force to the paper from the second rotation angle to the fourth rotation angle. This is a third state in which a smaller conveying force is applied than in the second state. Therefore, from the second rotation angle to the third rotation angle, the paper can be more reliably fed with a large transport force, and no pick error occurs. In addition, from the third rotation angle to the fourth rotation angle, the conveying force is weakened and the balance of the force relationship with the conveying roller is in a good state. The paper does not wrinkle.
Further, the paper feed roller has a structure in which a plurality of contact portions at positions different from each other with respect to the axial direction serving as the rotation center contact the sheet. A first contact portion that contacts the sheet until the rotation angle reaches the fourth rotation angle, and a second contact portion that contacts the sheet from the second rotation angle to the third rotation angle. since it was part is formed, according to the paper feeding device, so while the second contact portion are in contact acts large conveying force, the after leaving the second contact portion acting small conveying force Therefore, there is an effect that the change in the magnitude of the conveying force can be easily controlled only by the shape of the sheet feeding roller.
Furthermore, the conveyance force applied to the paper by the paper feed roller is the frictional force acting between the paper feed roller and the paper, and therefore, if the friction coefficient of the paper surface is the same, the friction coefficient of the paper supply roller surface is reduced. As the contact pressure between the sheet feeding roller and the sheet increases, the conveying force increases as the value increases. Therefore, in addition to the configuration according to the first aspect, a portion that comes into contact with the sheet from the second rotation angle to the third rotation angle, and a fourth rotation after reaching the third rotation angle. The portion that comes into contact with the paper up to the corner is formed of a material having a different friction coefficient on the surface, or the fourth rotation angle from the second rotation angle to the third rotation angle is reached after reaching the third rotation angle. Up to the rotation angle of, the magnitude of the conveying force can be changed by a method in which one of the paper feed roller and the paper is urged toward the other to change the contact pressure. However, since the structure of the paper feed roller itself and its peripheral structure are likely to be complicated, those described in the above-mentioned claim 1 are desirable in view of the cost in industrial production.
[0009]
In addition, the paper feeding device is configured such that the relationship between the distance from the paper feeding roller to the conveyance roller and the rotation angle of the paper feeding roller is such that the paper feeding roller reaches the third rotation angle when the paper feeding roller reaches the third rotation angle. It is preferable that the paper conveyed by the rollers is set so as to reach the conveyance rollers .
[0010]
In this case , when the paper feed roller reaches the third rotation angle, the paper transported by the paper feed roller reaches the transport roller, so that both the paper feed roller and the transport roller exert a transport force on the paper. In this state, the conveyance force of the paper feed roller is reduced, and both the effect of preventing pick errors and the effect of suppressing the inclination and wrinkles of the paper can be maximized.
[0011]
In addition, for example, the sheet conveyed by the sheet feeding roller before the sheet feeding roller reaches the third rotation angle may reach the conveying roller . Even in this case , the effect of preventing pick errors is sufficiently exhibited, and the period during which the balance of the force relationship with the transport roller is lost is shorter than that of the conventional product, so that the inclination and wrinkles of the paper are suppressed as compared with the conventional product. Conversely, the paper transported by the paper feed roller after the paper feed roller reaches the third rotation angle may reach the transport roller . In this case , although the conveying force is reduced slightly earlier, the effect of preventing pick mistakes is correspondingly improved, and the inclination and wrinkles of the paper are suppressed as compared with the conventional product.
[0012]
[0013]
[0014]
[0015]
Next, the paper feeding device according to claim 2 is
A structure in which the transport roller contacts the sheet at a plurality of contact portions located at different positions with respect to an axial direction serving as a rotation center,
The positional relationship between the contact portion of the transport roller and the first contact portion of the paper feed roller is such that even when both contact the same sheet and apply a transport force, the sheet is moved relative to the sheet in the transport direction. Characterized in that there is a positional relationship in which no tilting force acts.
[0016]
Here, the positional relationship between the contact portion of the transport roller and the first contact portion of the paper feed roller is such that even if both contact the same sheet and apply a transport force, the sheet is moved in the transport direction with respect to the sheet. For example, as described in claim 5, the positional relationship in which a force that inclines with respect to
This is the case where the contact portion of the transport roller and the first contact portion of the paper feed roller are in contact with the paper at the same position in the axial direction that is the center of rotation.
[0017]
Alternatively, in the case where the contact portion of the transport roller and the first contact portion of the paper feed roller are in contact with the sheet at a line-symmetric position with respect to the center line extending in the sheet transport direction as the center of symmetry, Can be said to be in a positional relationship in which no force is exerted such as to incline with respect to the transport direction.
[0018]
In any case, according to such a paper feeder, the transport roller has a structure in which the paper comes in contact with a plurality of contact portions in the same manner as the paper feed roller. By optimizing the positional relationship between the paper roller and the first contact portion, a state in which a force that inclines the sheet in the transport direction is not applied, there is an effect that the sheet is extremely unlikely to be inclined.
[0019]
In particular, in the paper feeding device according to the third aspect , the force for tilting the sheet to the left and right is not balanced and the tilt is suppressed, but the force for tilting the sheet to the right and left is not essentially applied. Therefore, for example, even if the sheet is relatively thin, it is possible to prevent an unnecessary load from being applied to the sheet.
[0020]
Next, the paper feeding device according to claim 4 is
A separation pad that is on the opposite side of the paper feed roller with the paper therebetween and that presses the paper against the paper feed roller to increase a frictional force acting between the paper feed roller and the paper;
The separation pad applies a first load at a position closer to the first contact portion than the second contact portion and presses the sheet toward the paper feed roller, while the second pad presses the second sheet more than the first contact portion. The apparatus is characterized in that the sheet is pressed against the paper feed roller by applying a second load smaller than the first load at a position near the contact portion.
[0021]
According to this paper feeder, while a relatively large load is applied to the first contact portion and a relatively small load is applied to the second contact portion, the second contact portion is rotated by the rotation of the paper feed roller. Even when the sheet does not contact the paper, the load applied to the first contact portion does not double. Therefore, there is an effect that it is possible to prevent the sheet from being tilted due to the load variation when the second contact portion is separated.
[0022]
In the above description, the term “paper” or “paper feed” is used to avoid unnecessarily complicated description, but the term “paper” used here is a form similar to “paper”. This is a concept including all the objects to be conveyed, for example, sheets and films, and the material of the object to be conveyed is not limited to “paper” in a narrow sense.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with an example.
As shown in FIG. 1, the paper feeding device 1 according to the present embodiment is incorporated in a laser printer P.
[0024]
That is, the laser printer P operates the sheet feeding device 1 to convey the sheets S stacked and stored in the sheet feeding cassette 2 one by one to the downstream side of the conveyance path, and the sheet S is transported by the pair of registration rollers 3. After adjusting the leading end position, the sheet S is conveyed to the image recording unit 4, a recording image is formed on the sheet S in the image recording unit 4, and the sheet S is further transferred to the thermal fixing device downstream of the conveying path. 6, the recording image on the sheet S is fixed on the sheet S in the heat fixing device 6, and the sheet S is discharged to a discharge tray 9 outside the main body by a discharge device 8. I have.
[0025]
The image recording unit 4 includes a drum-type electrophotographic photosensitive member 4a, a charger 4b composed of a scorotron, an exposure unit 4c composed of a laser scanner, a developing unit 4d, a transfer unit 4e composed of a scorotron, and a scorotron. A charge is applied to the surface of the drum type electrophotographic photosensitive member 4a by a charger 4b, and light from a laser light source is projected on the surface of the electrophotographic photosensitive member 4a by an exposure device 4c. An electrostatic latent image is formed, the electrostatic latent image is developed using a toner in a developing unit 4d, and an image (hereinafter, referred to as a toner image) made of the toner is transferred to the sheet S by a transfer unit 4e. A toner image is formed thereon.
[0026]
The heat fixing device 6 includes a pair of heat rollers 6a and a pressure roller 6b, and conveys the paper S to the downstream side of the conveyance path by rotating while sandwiching the paper S between the rollers 6a and 6b. The sheet S and the toner are heated by the heat generated by the heat roller 6a and pressurized by the pressure from the pressure roller 6b to fix the melted or softened toner on the sheet S.
[0027]
Next, the sheet feeding device 1 will be described in detail.
As shown in FIGS. 2 and 3, the paper feeding device 1 includes a first paper feeding roller 11 and a second paper feeding roller 12 that are driven to rotate in the direction of arrow A in FIG. 2 by a motor (not shown). Rollers 14 and 15 that are rotatable relative to the paper feed rollers 11 and 12 about the same axis as the rotation center of the paper feed rollers 11 and 12 and the paper transport direction from the paper feed rollers 11 and 12. And a pair of transport rollers 17 and 18 that are driven to rotate on the downstream side.
[0028]
Among these, the first paper feed roller 11 has a structure in which a rubber 22 is wound around an outer periphery of a core 20, as shown in FIGS. 4A and 4B. A support member 20a and a retaining piece 20b project from both end surfaces of the core 20, and the support member 20a and the retaining piece 20b form a substantially cylindrical wall surface as a whole, and the rollers 14, 15 rotate around its outer periphery. It is fitted freely. The retaining piece 20b is in a state where its tip is hooked on the end faces of the rollers 14, 15, and prevents the rollers 14, 15 from falling off from the support member 20a and the retaining piece 20b. A connecting shaft 20c protrudes from one end surface of the core 20. By connecting the connecting shaft 20c to the second paper feed roller 12, the two paper feed rollers 11, 12 are rotated at a specific rotation angle. It is to be connected. Further, the rubber 22 has a large-diameter portion 22a forming an outer peripheral surface having a cylindrical side surface and a small-diameter portion 22b forming an outer peripheral surface having a smaller diameter than the large-diameter portion 22a. . The vicinity of both ends of the large-diameter portion 22a (portion C in FIG. 4) is cut off obliquely so that the width gradually decreases toward the small-diameter portion 22b.
[0029]
As shown in FIGS. 5A and 5B, the second paper feed roller 12 also has a schematic structure similar to that of the first paper feed roller 11, and a rubber 26 is wound around the core 24. The rubber 26 has a large-diameter portion 26a forming an outer peripheral surface having a cylindrical side surface and a small-diameter portion 26b forming an outer peripheral surface having a smaller diameter than the large-diameter portion 26a. The large-diameter portion 26a is cut obliquely near both ends (portion D in FIG. 5) so that the width gradually decreases toward the small-diameter portion 26b. However, the lengths L1 and L2 of the large diameter portions 22a and 26a are different between the first paper supply roller 11 and the second paper supply roller 12, and the length L1 of the large diameter portion 22a is longer.
[0030]
The outer diameters of the rollers 14 and 15 are smaller than the large diameter portion 22a of the first paper feed roller 11 and the large diameter portion 26a of the second paper supply roller 12, and the small diameter portion 22b of the first paper supply roller 11 2 It is larger than the small diameter portion 26b of the paper feed roller 12.
As shown in FIG. 3, the transport rollers 17 are arranged in the same direction as the range between the rollers 14 and 15 (indicated by a dashed line in FIG. 3) in the direction of the rotation axis.
[0031]
Further, as shown in FIGS. 2 and 6, the sheet feeding device 1 includes a pad holder 30 fitted in the sheet feeding cassette 2 so as to be reciprocally movable in a direction indicated by an arrow B in FIG. Coil springs 32 and 33 for urging the rubber, and a rubber separation pad 35 attached to the upper surface of the pad holder 30.
[0032]
Of these, the coil springs 32 and 33 have different loads applied to the pad holder 30. In this paper feeder 1, the coil spring 32 on the first paper feed roller 11 side has a load of 100 g and the second paper feed roller 12 side Is set to a load of 50 g.
[0033]
In the sheet feeding device 1 configured as described above, when performing the sheet feeding operation, the two sheet feeding rollers 11 and 12 are driven to rotate, and the large-diameter portion 22a is formed on the surface of the sheet S set at the sheet feeding position. , 26a in contact with each other. At this time, a frictional force acts between the separation pad 35 and the sheet S to hinder the movement of the sheet S to the downstream side of the transport path. Is sent out. Then, the transport rollers 17 and 18 rotate while bringing the outer peripheral portion into contact with the surface of the paper S sent from the upstream side of the transport path by the two paper feed rollers 11 and 12, and further rotate the paper S downstream of the transport path. Send to the side.
[0034]
Here, the large-diameter portions 22a and 26a of the two paper feed rollers 11 and 12 have different lengths L1 and L2 as described above, and therefore, as shown by double-headed arrows in FIG. Are different.
More specifically, before the start of the sheet feeding operation, as shown in FIG. 7, both the sheet feeding rollers 11 and 12 are in a stationary state at the first rotation angle θ1.
[0035]
In this state, the small-diameter portions 22b and 26b of both of the paper feed rollers 11 and 12 face the surface of the paper S at the position indicated by the two-dot chain line in FIG. It is in a state to do.
When the two paper feed rollers 11 and 12 are driven to rotate and make one rotation for the paper feed operation, first, the two paper feed rollers 11 and 12 reach the second rotation angle θ2.
[0036]
At this time, the large-diameter portions 22a and 26a of the paper feed rollers 11 and 12 that are larger than the outer diameters of the rollers 14 and 15 come into contact with the paper S, and the paper feed rollers 11 and 12 convey the paper S with respect to the paper S. This is the second state in which a force is applied. Until the paper feed rollers 11 and 12 reach the third rotation angle θ3, the paper feed rollers 11 and 12 are in a state of applying a conveyance force to the paper S. The force acts, and the sheet S is reliably sent to the downstream side in the transport direction.
[0037]
Subsequently, the two paper feed rollers 11 and 12 reach the third rotation angle θ3 just at the timing when the leading end of the paper S reaches the transport roller 17.
At this time, the large-diameter portion 22a of the first paper feed roller 11 maintains contact with the paper S, but the large-diameter portion 26a of the second paper feed roller 12 is separated from the paper S, and the small-diameter The portion 26b reaches a position facing the surface of the sheet S. As a result, a third state in which a smaller conveying force acts on the sheet S than in the second state.
[0038]
Further, at this point, the load applied to both the paper feed rollers 11 and 12 from the separation pad 35 side is concentrated on the first paper feed roller 11 only. However, the loads applied to the pad holders 30 differ from the coil springs 32 and 33 in the first place, and a larger load is applied to the first paper feed roller 11 side from the beginning, so that the second paper feed roller 12 is separated. The change in load caused by the load is relatively small, and the change in load does not cause the sheet to be tilted. Until the two paper feed rollers 11 and 12 reach the fourth rotation angle θ4, the first paper feed roller 11 and the transport roller 17 are in a state of applying a transport force to the sheet S, but the second paper feed roller In the state where the transporting force on the paper feed roller side is reduced by the amount of 12, the balance of the force relationship with the transporting roller 17 is just improved, so that this also does not cause the sheet being transported to be skewed. Further, since the first paper feed roller 11 and the transport roller 17 are brought into contact with the paper S at the same position in the axial direction which is the center of rotation, this also has the effect of preventing the paper being transported from being inclined. Is increasing.
[0039]
Subsequently, the two feed rollers 11 and 12 reach the fourth rotation angle θ4.
At this time, the small diameter portion 22b of the first paper feed roller 11 reaches a position facing the surface of the paper S. Therefore, from here, the first state is resumed. Thereafter, only the transport roller 17 applies a transport force to the sheet S. However, since the two feed rollers 11 and 12 are in the first state in which the displacement of the sheet S is not hindered, the sheet is being transported. There is no inclination of the paper. After this, the two paper feed rollers 11 and 12 reach the first rotation angle θ1 and stand still.
[0040]
As described above, according to the paper feeder 1, when the paper feed rollers 11 and 12 make one rotation to feed one sheet of paper S, the paper feed rollers 11 and 12 initially have a large conveying force. Therefore, the pick-up of the sheet S does not occur, and the sheet S can be sent out more reliably than before. In addition, only the second paper feed roller 12 stops applying the conveying force on the way, and as a result, the conveying force is reduced and the balance of the power relationship with the conveying roller 17 is improved. Less likely to cause wrinkles.
[0041]
In the above description of the sheet feeding device 1, the two sheet feeding rollers 11 and 12 correspond to the sheet feeding rollers in the sheet feeding device of the present invention, and the large-diameter portions 22a and 26a respectively correspond to the sheet feeding devices of the present invention. Correspond to the first contact portion and the second contact portion.
As described above, the embodiments of the present invention have been described. However, various specific embodiments other than those described above can be considered for the embodiments of the present invention.
[0042]
For example, the paper feeder 1 is configured by combining paper feed rollers 11 and 12 having different lengths L1 and L2 of the large-diameter portions 22a and 26a to form a paper feed roller in which the conveying force is reduced during rotation. The specific structure of the paper feed roller is not limited to the above. Specifically, for example, the paper feed roller 50 shown in FIGS. 8A and 8B is configured by winding a rubber 54 around the outer periphery of a core 52. A cavity 56 is formed inside the rubber 54 by shaving a part. Therefore, when the outer peripheral surface of the rubber 54 is brought into contact with the sheet, the rubber 54 escapes toward the cavity 56 in the portion where the cavity 56 is present, and the contact pressure is reduced. Therefore, the position and the rotation direction of the cavity 56 are adjusted so that the sheet first contacts the sheet at a position corresponding to the range without the cavity 56, and contacts the sheet at a position corresponding to the range with the cavity 56 on the way. If adjusted, even the paper feed roller 50 having such a structure becomes a paper feed roller in which the transport force is initially large and the transport force is reduced during the rotation.
[0043]
Further, the paper feeding device 1 is of a type in which the paper feeding rollers 11 and 12 are provided so as to come into contact with the vicinity of the side edge of the paper. The desired effect can be obtained even if the system is provided so that the sheet 12 comes in contact with the vicinity of the center of the sheet.
[0044]
Further, the paper feeder 1 employs one each of the first paper feed roller 11 and the second paper feed roller 12, but each of the first paper feed roller 11 and the second paper feed roller 12 has a plurality. In this case, the first paper feed rollers 11 and the second paper feed rollers 12 may be alternately arranged.
[0045]
In addition, although the paper feeder 1 feeds the paper S from the paper feed cassette 2, a paper feeder having a similar structure is arranged so as to feed paper from a paper feed position other than the paper feed cassette. You may. Specifically, for example, many printers having a paper feed cassette are configured so that paper can be fed from another path other than the paper feed cassette (for example, a paper feed port on the front of the main body). A paper feeder having a similar structure can be provided in this separate path.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a schematic structure of a laser printer including a sheet feeding device, as viewed from a right side.
FIG. 2 is a side sectional view of the vicinity of a sheet feeding device viewed from a right side.
FIG. 3 is a plan view showing the vicinity of first and second paper feed rollers.
4A and 4B show a first paper feed roller, wherein FIG. 4A is a front view thereof, and FIG. 4B is a left side view thereof.
5A and 5B show a second paper feed roller, wherein FIG. 5A is a front view thereof, and FIG. 5B is a left side view thereof.
FIG. 6 is a plan view near a separation pad.
FIG. 7 is an explanatory diagram for explaining a relationship between rotation angles of first and second sheet feeding rollers and a state of contact with a sheet.
8A and 8B show an example of another sheet feeding roller. FIG. 8A is a perspective view of a core of the sheet feeding roller, and FIG. 8B is a sectional view of the sheet feeding roller.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Paper feeder, 2 ... Paper feed cassette, 3 ... Registration roller, 4 ... Image recording unit, 6 ... Thermal fixing device, 8 ... Paper discharge device, 9 ... · Paper discharge tray, 11 ··· first feed roller, 12 ··· second feed roller, 14, 15 ··· roller, 17 ··· transport roller, 20, 24 ··· core, 22, 26: rubber, 22a, 26a: large diameter part, 22b, 26b: small diameter part, 30: pad holder, 32, 33: coil spring, 35: separation pad.

Claims (4)

When driven to rotate, the paper is rotated while the outer peripheral portion is in contact with the surface of the paper placed at the paper feed position, and each time the paper makes one rotation, the paper is moved one sheet at a time from the paper feed position to the downstream side of the transport path. A feed roller that feeds the paper, and a feed roller that rotates while bringing the outer peripheral portion into contact with the surface of the paper sent from the upstream side of the feed path by the feed roller and feeds the paper further to the downstream side of the feed path. Paper feeder with
The paper feed roller is always in a first state in which it is stationary at a first rotation angle and does not hinder the displacement of the sheet, and reaches a second rotation angle when it is driven to rotate and makes one rotation. And a second state in which a conveying force is applied to the sheet, and then, when the third rotation angle is reached, a third state in which a smaller conveying force is applied to the sheet than in the second state. followed become fourth again the first state reaches the rotation angle of, then the first is configured as a still that led to the rotational angle, moreover, different positions for the axial as the center of rotation A plurality of contact portions in contact with the paper in the structure,
A first contact portion that contacts the sheet from the second rotation angle to the fourth rotation angle when the plurality of contact portions are rotated and driven to make one rotation; and A sheet feeding device, wherein a second contact portion that contacts the sheet from the rotation angle to the third rotation angle is formed . A structure in which the transport roller contacts the sheet at a plurality of contact portions located at different positions with respect to an axial direction serving as a rotation center,
The positional relationship between the contact portion of the transport roller and the first contact portion of the paper feed roller is such that even when both contact the same sheet and apply a transport force, the sheet is moved relative to the sheet in the transport direction. 2. The sheet feeding device according to claim 1 , wherein the sheet feeding device has a positional relationship in which a force such as tilting does not act. 3. The sheet feeding device according to claim 2 , wherein the contact portion of the transport roller and the first contact portion of the sheet feeding roller are in contact with the sheet at the same position in an axial direction that is a center of rotation. 4. . A separation pad that is on the opposite side of the paper feed roller with the paper therebetween and that presses the paper against the paper feed roller to increase a frictional force acting between the paper feed roller and the paper;
The separation pad applies a first load at a position closer to the first contact portion than the second contact portion and presses the sheet toward the paper feed roller, while the second pad presses the second sheet more than the first contact portion. over second load smaller than the first load at a position closer to the contact portion of the claims 1 to 3, characterized in that it is configured to press the sheet to the sheet feed roller side A paper feeding device according to any one of the above.

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