JP2003276870A - Automatic paper feed mechanism - Google Patents

Abstract

(57) [Summary] [Problem] To provide an automatic paper feed mechanism having a paper feed roller and a friction pad that feeds out and automatically returns to a normal state without any trouble even if a misfeed occurs. An automatic paper feed mechanism capable of eliminating the feeding state is realized with a simple configuration. SOLUTION: The uppermost sheet 11 is in contact with the upper surface of the uppermost sheet 11 of the stacked sheets 10 on the outer peripheral surface.
The paper feed roller 20 that feeds the paper 11 is disposed at a position where the paper is fed by the paper feed roller 20 while being urged toward the outer peripheral surface of the paper feed roller 20, and is fed simultaneously with the uppermost paper 11. And a friction pad 50 for preventing a plurality of sheets of paper 10 from being fed out simultaneously by frictional force in contact with the paper sheet 10, and transmitting a rotation output of a rotation drive source to the paper feed roller 20. A part of the force transmission path is made of an elastic body such as the coil spring 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic sheet feeding mechanism for separating stacked sheets one by one and feeding them to a post-processing section (printing section or reading section of a printer or scanner). More specifically, a paper feed roller that comes into contact with the outer surfaces of the stacked paper sheets and feeds the outer paper sheets, and a paper sheet feeding position by the paper feed roller toward the outer peripheral surface of the paper feed roller. Automatically equipped with a friction pad that is arranged in a biased state and that contacts with the paper sheets fed out at the same time as the outer surface sheets and prevents the simultaneous feeding of multiple sheets by frictional force. Regarding the paper feed mechanism.

[0002]

2. Description of the Related Art FIG. 6 is a side view showing a main portion of a conventional automatic sheet feeding mechanism in a printer, a scanner, etc., and FIG. 7 is a front view seen from the right side of FIG. In these figures, the paper sheets 10 are stacked on the paper feed table 30. The paper feed table 30 is biased upward (in the direction of arrow A) by a pressing means such as a spring (not shown), and the uppermost paper sheet 11 in the paper sheets 10 is pressed against the outer peripheral surface of the paper feed roller 20. Has been done. Accordingly, the paper feed roller 20 can feed the uppermost paper sheet 11 by rotating in the counterclockwise direction (direction B) in FIG.

The paper feed roller 20 has a cylindrical collar portion 21 which is locked to a drive shaft 40 which rotates in the direction of arrow B.
And a rubber ring 22 fitted to the outer cylindrical surface of the collar portion 21. A friction pad 50 is arranged at the sheet feeding position of the sheet feeding roller 20. The friction pad 50 comes into contact with the paper sheet 10 sent out at the same time as the uppermost paper sheet 11 and prevents a plurality of paper sheets 10 from being fed out simultaneously by a frictional force.

As the friction pad 50, generally, the friction coefficient between the friction pad 50 and the paper sheet 10 is slightly higher than the friction coefficient between the paper sheets 10 and the paper feed roller 20.
A material having a value lower than the friction coefficient between the paper sheets 10 is used, and as the material, an EPDM rubber plate having a JIS-A hardness of about 70 degrees, a urethane foam rubber plate, a cork plate or the like is often used. The friction pad 50 is movably supported in the outer peripheral surface direction (arrow C direction) of the paper feeding roller 20, and is further urged toward the outer peripheral surface of the paper feeding roller 20 by a pressing means such as a spring (not shown). .

Next, the operation of the conventional automatic paper feed mechanism will be described with reference to FIG. When the paper feed roller 20 is rotated in the direction of arrow B by a rotary drive source such as a motor (not shown), the uppermost paper sheet 11 that is in contact with the paper feed roller 20.
Moves in the transport direction (arrow D direction). At this time, the friction force between the paper sheets 10 also moves the second paper sheet 12 in the transport direction, and in some cases, the third paper sheet is also dragged to the second paper sheet 12. And move in the transport direction. Then, the tips of the plurality of sheets 10 contact the friction pad 50.

In this state, the conveying force applied from the paper feed roller 20 for the uppermost paper sheet 11 is larger than the total frictional resistance force from the friction pad 50 and the second paper sheet 12, After that, it proceeds in the transport direction (direction of arrow D). However, in the second and subsequent paper sheets 10, the conveying force given from the uppermost paper sheet 11 is smaller than the total friction resistance force from the friction pad 50 and the third paper sheet, It stops at the position where it abuts the friction pad 50. Through the above operation, only the uppermost paper sheet 11 of the paper sheets 10 is fed out. After that, the highest one
When the trailing edge of the first sheet 11 comes out from under the sheet feeding roller 20, the feeding operation similar to the above is repeated, and only the next highest sheet is fed.

[0007]

In such an automatic paper feeding mechanism, since only one sheet is fed out from the stacked paper sheets due to the difference in the friction coefficient between the respective members, the paper sheets are interleaved and the paper sheets are interleaved. If there is a large difference in the friction coefficient between the friction pad and the friction pad, or between the paper sheet and the paper feed roller, it is easy to perform an accurate feeding operation. Also, the magnitude relationship of the friction coefficient must be "friction coefficient between paper sheets"<"friction coefficient between paper sheets and friction pad"<"friction coefficient between paper sheets and paper feed roller". Is.
However, if this relationship is satisfied, it is not always possible to separate only one sheet, and a large margin is required for the difference between the friction coefficients depending on the paper quality and the like.

However, since paper dust, dust, and the like adhere to the surface of the paper feed roller, the friction coefficient between the paper feed roller and the paper sheets is likely to decrease, and the stacked paper sheets have There is a case where a so-called "non-feeding" phenomenon occurs in which even the topmost paper sheet cannot be delivered due to an indefinite adhesion force. Here, the indeterminate adhesive force between the paper sheets means that the cut surfaces of the cut paper mesh with each other and adhere to each other, or that the paper sheets once containing humidity are dried and stuck to each other. It is caused by the meshing of irregularities between the fibers. It also occurs in the case of paper sheets whose surface is coated with resin and whose air permeability is reduced. If there is such a cause, even if the friction coefficient is set as described above, the paper feed roller idles and the topmost sheet is not fed out and is not fed. , The automatic paper feed mechanism goes into a dormant state.

Typical examples of the feeding failure in the automatic sheet feeding mechanism are the "non-feeding" in which no sheet is fed and the "double feeding" in which a plurality of sheets are fed at once. There are two. In the case of double feeding, if the paper sheets are fed in close contact with each other, the automatic paper feeding mechanism will not be in a resting state. However, in the case of non-feeding, it requires manual labor for recovery such as cleaning the paper feed roller and re-punching the stack of stacked paper sheets, resulting in a reduction in work efficiency.

In recent years, networking of printers and the like has progressed, and there are many cases where printing is performed by giving instructions from a location distant from the printer. In such a case, however, once a misfeed occurs, recovery work is performed. Every person has to go to the place where the printer is installed, which is contrary to the purpose of installing the network printer for efficiency.

The present invention has been made in order to solve the above problems, and the problem to be solved by the present invention is to automatically return to a normal state without any trouble even if a misfeed occurs. It is to realize an automatic paper feed mechanism that can eliminate the non-feed state with a simple configuration.

[0012]

The invention according to claim 1 which solves the above-mentioned problems, is shown in FIG. 1 and FIG. 2 showing a first embodiment of the present invention. A sheet feeding roller 20 that comes into contact with the outer surface of the leaf 10 and feeds the outer sheet 10 (the uppermost sheet 1 in FIGS. 1 and 2).
Because of the configuration for feeding 1, the outermost surface of the sheet feeding roller 20 is brought into contact with the upper surface of the uppermost paper sheet 11 and the uppermost paper sheet 1
However, since the lowest sheet can be easily fed, the expression "outer surface of stacked sheets" is used), and the sheet feeding position by the sheet feeding roller 20. Is placed in a state of being urged toward the outer peripheral surface of the paper feed roller 20 and comes into contact with the paper sheet 10 sent out simultaneously with the paper sheet 11 on the outer surface, and a plurality of paper sheets 10 are simultaneously fed out. And a friction pad 50 that prevents the frictional force from being applied to the sheet feeding roller 20. (In FIG. 1, the coil spring 60 is engaged between the drive shaft 40 and the paper feed roller 20 which are provided so as to be relatively rotatable).

In the present invention, the rotational output of the rotary drive source is supplied to the paper feed roller 20 via the elastic body such as the coil spring 60.
Therefore, the elastic body is elastically deformed (twisted) in accordance with the transmitted torque. With this configuration, when the paper feed roller 20 does not feed and the paper sheet 11 on the outer surface cannot be fed, the paper feed roller 20 idles while directly contacting the friction pad 50.

The frictional force between the paper feed roller 20 and the paper sheet 11,
Also, the frictional force between the friction pad 50 and the paper feed roller 20 is large, and in the friction between the paper feed roller 20 and the friction pad 50 (generally rubber), the boundary between the static friction coefficient and the dynamic friction coefficient is unclear. Is also likely to occur. Therefore, during idling, the torsional force is accumulated in the elastic body more than during normal extension. The accumulated twisting force is applied to the paper feed roller 20.
When it reaches the limit beyond the frictional resistance force acting on, the torsion of the elastic body returns at a stretch, and the paper feed roller 20 rapidly rotates,
The accumulated twisting force is released all at once. If the non-feeding state continues, the above-mentioned cycle of accumulating and releasing the twisting force is repeated, and when viewed from the side of the paper sheet 10, the rotation speed of the paper feed roller 20 fluctuates. This paper feed roller 20
The intermittent change in the rotation speed of the
A kind of judgment effect is produced against. As a result, the adhesion of the paper sheet 10 is canceled, and the feeding of the paper sheet 11 on the outer surface is restarted.

As described above, according to the present invention, even if a misfeed occurs, the automatic paper feed mechanism that can automatically return to the normal state without the need of manpower and eliminate the misfeed is simple. Can be realized with a simple configuration.

According to a second aspect of the present invention, in the first aspect of the invention, the drive shaft is arranged coaxially with the sheet feeding roller, is driven to rotate by a rotary drive source, and rotatably supports the sheet feeding roller. And a spring as an elastic body that is locked between the drive shaft and the paper feed roller and elastically deforms when the drive shaft rotates relative to the paper feed roller. This facilitates the placement of the elastic body.

According to a third aspect of the present invention, the spring according to the second aspect is a coil spring that is coaxially fitted in the drive shaft with a gap, and one end of the coil spring is locked to the drive shaft. The other end is locked to the paper feed roller. Since the coil spring is locked between the drive shaft and the paper feed roller, the structure can be further simplified.

According to a fourth aspect of the present invention, in the invention according to the second aspect, a through hole is formed in the drive shaft in a radial direction, and a spring has an intermediate portion fitted in the through hole.
It is characterized in that it is a U-shaped wire spring whose both ends are bent into an L-shape and whose ends are locked in holes formed in the end surface of the paper feed roller. Since it is locked between the paper rollers, the structure can be further simplified.

According to a fifth aspect of the present invention, the spring according to the third or fourth aspect of the invention is a state in which the paper feed roller is stopped and the drive shaft is rotated by braking due to the frictional force acting on the paper feed roller from the friction pad. Is present, the intermittent rotation speed change is surely caused in the paper feed roller, and a stable separating effect is exerted on the paper sheets.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a side view showing the main part of the first embodiment,
FIG. 2 is a peripheral view of the paper feed roller viewed from the left side of FIG.
1 and 2, parts corresponding to those in FIGS. 6 and 7 are designated by the same reference numerals. It should be noted that the feeding of the paper sheets may be performed by feeding the lowest paper sheet instead of feeding the highest paper sheet. Although the present invention can be applied to any of them, the present embodiment has a configuration in which the outermost surface of the paper feed roller is brought into contact with the upper surface of the uppermost paper sheet and the uppermost paper sheet is fed out. Is.

Also in this embodiment, the paper sheets 10 are stacked on the paper feed table 30. The paper feed table 30 is biased upward (in the direction of arrow A) by a pressing means such as a spring (not shown), and the uppermost sheet 11 is fed by the paper feed roller 20.
Is pressed against the outer peripheral surface of. As a result, the paper feed roller 2
When 0 rotates in the counterclockwise direction (direction B) in FIG. 1, the uppermost paper sheet 11 can be fed out.
A friction pad 50 is arranged at the sheet feeding position by the sheet feeding roller 20, as in the case of FIGS. 6 and 7. The friction pad 50 comes into contact with the uppermost paper sheet 11 in the paper sheets 10 sent out at the same time as the paper sheet 10 and prevents a plurality of the paper sheets 10 from being fed out by a frictional force. Is.

As the friction pad 50, generally, the friction coefficient between the friction pad 50 and the paper sheet 10 is slightly higher than the friction coefficient between the paper sheets 10 and the paper feed roller 20.
A material having a value lower than the friction coefficient between the paper sheets 10 is used, and the material is, for example, JIS-A hardness E of about 70 degrees.
A PDM rubber plate, a urethane foam rubber plate, a cork plate, or the like is used. The friction pad 50 is movably supported in the outer peripheral surface direction (arrow C direction) of the paper feeding roller 20, and is further urged toward the outer peripheral surface of the paper feeding roller 20 by a pressing means such as a spring (not shown). .

The paper feed roller 20 in the present embodiment is a cylindrical collar portion 21 rotatably fitted to a drive shaft 40 rotating in the direction of arrow B, and an outer cylinder surface of the collar portion 21. And a rubber ring 22.
The collar portion 21 is formed of a resin material such as POM having a small friction coefficient. Further, the paper feed roller 20 is prevented from moving in the axial direction of the drive shaft 40 by a regulation means (not shown).

The drive shaft 40 in the present embodiment rotatably supports the paper feed roller 20 and is rotationally driven by a rotary drive source such as a motor (not shown). A coil spring 60, which is an elastic body, is locked between the drive shaft 40 and the sheet feeding roller 20.
When the drive shaft 40 rotates relative to 0,
When the coil spring 60 is elastically deformed and the drive shaft 40 rotates, the rotational drive force is transmitted from the drive shaft 40 to the sheet feeding roller 20 via the coil spring 60.

The inner diameter of the coil spring 60 is sufficiently larger than the outer diameter of the drive shaft 40, and
0 is inserted coaxially with a clearance, one end 61 is locked in the fixing hole 41 of the drive shaft 40, and the other end 62 is
Is locked in a fixing hole 25 at the side end of the sheet feeding roller 20. Note that, in the present embodiment, the winding direction of the coil spring 60 is such that when the drive shaft 40 is rotated in the direction of arrow B after the paper feed roller 20 is forcibly stopped,
It is shaped so that the inner diameter increases. But,
When the gap with the drive shaft 40 is large, the coil spring 60 does not tighten the drive shaft 40 even if the winding direction is reversed, so the winding direction does not matter.

Next, the operation of this embodiment will be described.
When the first sheet (uppermost sheet 11) is normally fed out, first, the drive shaft 40 is rotated by a rotation drive source (not shown), and the sheet feeding roller 20 is rotationally driven via the coil spring 60. Power is transmitted. At this time, the friction force between the friction pad 50 and the paper feed roller 20 and the paper sheet 1
The frictional force of 0 between them becomes a rotational load of the paper feed roller 20, and the paper feed roller 20 is stopped and the coil spring 6 is held.
Torsional force is accumulated at 0.

When the paper feed roller 20 starts to rotate even a little beyond the balance point between the rotational load and the twisting force, the uppermost paper sheet 11 (in some cases, the second paper sheet). (12) also immediately enters the contact portion (nip portion) between the friction pad 50 and the paper feed roller 20, and thereafter, the rotational load applied to the paper feed roller 20 is the dynamic frictional force between the friction pad 50 and the paper sheet 10. , Which is the dynamic frictional force between the paper sheets 10. These two forces are much smaller than the force at the start of feeding, and the feed roller 20 smoothly feeds the uppermost paper sheet 11.

On the other hand, in the case of the non-feeding situation, immediately after the rotation of the paper feed roller 20 is started in the case of normal feeding, the paper feed roller 2 is contacted by the adhesive force between the paper sheets 10.
This is the case where 0 slips on the paper sheet 11. If the paper feed roller 20 spins without feeding the paper sheet 11,
The friction pad 50 rotates for a while while directly contacting the paper feed roller 20. Paper feed roller 20 / paper sheet 11
And the friction force between the friction pad 50 and the paper feed roller 20 is large, and in the friction between the paper feed roller 20 and the friction pad 50, a phenomenon in which the boundary between the static friction coefficient and the dynamic friction coefficient becomes unclear easily occurs.

Therefore, during idling, the twisting force is accumulated in the coil spring 60 more than when it is normally fed out. When the accumulated torsional force exceeds the frictional resistance force acting on the paper feed roller 20 and reaches the limit, the coil spring 6
Since the twist of 0 is returned at once, the paper feed roller 20 slips and rapidly rotates at a higher speed than the drive shaft 40, and the accumulated twisting force is released at once. If the undelivered condition continues,
This cycle is repeated, and when viewed from the side of the paper sheet 10,
It seems that the rotation of the paper feed roller 20 becomes faster or the brake is suddenly applied.

The intermittent change of the rotation speed of the paper feed roller 20 causes a shock, and a sort of a separating effect is produced on the paper sheet 10. As a result, the adhesive force of the paper sheet 10 is canceled, and the paper sheet 11 that has not been fed is delivered.

FIG. 3 shows the rotation state of the drive shaft 40 and the paper feed roller 20 according to this embodiment. As can be seen from this figure, the drive shaft 40 is driven at a constant angular velocity, but the paper feed roller 20 is in an intermittent rotation state that is characteristic of the function of the coil spring 60 and nonlinear friction.

In order for the paper feed roller 20 to behave as shown in FIG.
It is necessary to have a strength in which the paper feed roller 20 is stopped and the drive shaft 40 is rotated by braking due to a frictional force acting on the paper feed roller 20 from 0, and the spring constant of the coil spring 60 is large. It is desirable to set it so that it is not too much.

As described above, in this embodiment, even if the feed failure occurs, the normal state can be automatically restored without the need for manpower. Moreover, it has an extremely simple structure,
There is almost no increase in cost. (Second Embodiment) FIG. 4 is a side view showing the main part of the second embodiment, and FIG. 5 is a peripheral view of the paper feed roller viewed from the left side of FIG. 4 and 5, parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals. The difference between the present embodiment and the first embodiment is that the U-shaped wire spring 70 is mainly used as a spring, and the configuration of the other parts is the same as that of the first embodiment. .

A through hole 42 is provided in the drive shaft 40 in the present embodiment in the radial direction. In the U-shaped wire spring 70, the intermediate portion is inserted into the through hole 42, and the ends of the both end portions 71 and 72 bent into the L shape are fixed holes 26, which are formed in the end surface of the paper feed roller 20. Two
It is locked at 7.

The U-shaped wire spring 70 of this embodiment
Also, the coil spring 60 in the first embodiment example
Similarly, the drive shaft 40 is locked between the drive shaft 40 and the paper feed roller 20, and elastically deforms when the drive shaft 40 rotates relative to the paper feed roller 20, and the drive shaft 40 rotates. Then, the rotational drive force is applied to the drive shaft 40.
Is transmitted from the paper feed roller 20 to the paper feed roller 20. Therefore, the operation of the present embodiment is exactly the same as that of the first embodiment,
The function of the coil spring 60 in the first embodiment is merely performed by the U-shaped wire spring 70 in this embodiment. Therefore, the description of the operation of this embodiment is omitted.

Also in this embodiment, even if the feed failure occurs, the normal state can be automatically restored without the need for manpower. In addition, the structure is extremely simple, and there is almost no increase in cost. (Other Embodiments) The present invention is not limited to the configuration of the above embodiment. For example, the present invention also includes the following embodiments. The basic idea of the present invention is to configure a part of the rotational force transmission path for transmitting the rotation output of the rotary drive source to the paper feed roller with an elastic body, and to provide an elastic body at a position other than between the drive shaft and the paper feed roller. It is also possible to arrange. However, arranging the elastic body between the drive shaft and the paper feed roller is the simplest in terms of layout. It is also possible to use other than the coil spring and the U-shaped wire spring as the elastic body. For example, use a spiral spring to lock the inner end to the drive shaft and lock the outer end to the paper feed roller, or arrange the drive shaft and the paper feed roller in a straight line so that they face each other. Insert a connection block made of an elastic material such as rubber between the end surfaces to be fixed. A belt winding mechanism is arranged in the rotational force transmission path that transmits the rotational output of the rotary drive source to the paper feed roller, and the belt is made of an elastic body such as rubber. There is play in the fitting part between the drive shaft and the paper feed roller,
Increase the impact of intermittent changes in the rotation speed of the paper feed roller. Regarding the feeding of the paper sheets, the lowest paper sheet is fed out instead of the highest paper sheet.

[0037]

As described above, according to the inventions of claims 1 to 5, a part of the rotational force transmission path for transmitting the rotational output of the rotary drive source to the sheet feeding roller is made of an elastic body. Even if a misfeed occurs, it is possible to realize an automatic paper feed mechanism with a simple configuration that can automatically return to the normal state and eliminate the misfeed without requiring human intervention.

Further, according to the invention of claim 2, since the elastic body is arranged between the drive shaft and the paper feed roller, the arrangement of the elastic body is facilitated, and the inventions of claims 3 and 4 are made. According to this, since the coil spring and the U-shaped wire spring are locked between the drive shaft and the sheet feeding roller, the structure can be further simplified. According to the fifth aspect of the present invention, the intermittent change in the rotation speed of the paper feed roller is reliably generated, and a stable separating effect is exerted on the paper sheets.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a first embodiment example.

FIG. 2 is a peripheral view of a sheet feeding roller viewed from the left side of FIG.

FIG. 3 is a diagram showing a rotating state of a drive shaft and a sheet feeding roller in the first embodiment.

FIG. 4 is a side view showing a main part of a second embodiment example.

5 is a diagram of the periphery of a paper feed roller viewed from the left in FIG.

FIG. 6 is a side view showing a main part of a conventional automatic sheet feeding mechanism.

FIG. 7 is a front view seen from the right side of FIG.

FIG. 8 is a diagram illustrating the operation of a conventional automatic paper feed mechanism.

[Explanation of symbols]

10 (11,12) Paper sheets 20 paper feed rollers 21 Color section 22 rubber ring 30 paper feed table 40 drive shaft 50 friction pad 60 coil spring 70 U-shaped wire spring

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuo Tamamushi             4-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa             No. 1 within Fujitsu Limited F-term (reference) 3F343 FA02 FA03 FB02 FB03 GB01                       GC01 JA14 JD08 KB05 LA03                       LA16 LB08 LC27

Claims (5)

[Claims] 1. Contacting the outer surface of laminated paper sheets,
A paper feed roller for feeding the outer paper sheet, and a paper sheet feeding position by the paper feed roller are arranged in a state of being urged toward the outer peripheral surface of the paper feed roller, and at the same time as the outer paper sheet. What is claimed is: 1.An automatic paper feed mechanism, comprising: a friction pad that comes into contact with delivered paper sheets and prevents a plurality of paper sheets from being fed out at the same time by a frictional force. An automatic paper feeding mechanism characterized in that a part of a rotational force transmission path for transmitting to a paper roller is made of an elastic body. 2. A drive shaft which is arranged coaxially with the paper feed roller, is rotationally driven by the rotary drive source, and rotatably supports the paper feed roller, and the drive shaft and the paper feed roller. 2. The automatic sheet feeding mechanism according to claim 1, further comprising a spring as an elastic body that is locked between the sheet feeding roller and elastically deforms when the drive shaft rotates relative to the sheet feeding roller. . 3. The coil spring is a coil spring coaxially inserted into the drive shaft with a gap, one end of the coil spring is locked to the drive shaft, and the other end is engaged with the paper feed roller. The automatic paper feed mechanism according to claim 2, wherein the automatic paper feed mechanism is stopped. 4. A through hole is bored in the drive shaft in a radial direction, an intermediate portion of the spring is fitted in the through hole, both ends of the spring are bent in an L shape, and a tip of the feed roller is formed. 3. The automatic paper feeding mechanism according to claim 2, wherein the automatic paper feeding mechanism is a U-shaped wire spring locked in a hole formed in the end surface of the sheet. 5. The strength of the spring is such that there is a state in which the paper feed roller is stopped and the drive shaft is rotated by braking due to a frictional force acting on the paper feed roller from the friction pad. Claim 3 or 4
The automatic paper feed mechanism described.