JPH09328233A - Paper conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely convey a group of thick paper, and to set a group of thin paper without problems. SOLUTION: A paper conveying device comprises a kick roller which conveys a group of paper, a paper supplying roller on which the group of paper conveyed by the kick roller, is placed to be conveyed by the rotation of the same, a separating member 24 which presses the group of paper reaching the paper supplying roller by the elastic force, for separating the paper one by one, a kick roller pressure which is installed in such manner that it can be displaced in the direction to be approached to or separated from the kick roller, and presses the group of paper to the kick roller by the elastic force in the direction approaching the kick roller, and a stopper which prevents the kick roller pressure from pressing the group of paper when the thickness of the paper is less than a prescribed value, and permits the same to press the group of paper when the thickness of the paper is more than the prescribed value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device used for a document reading section in a facsimile machine, for example.

[0002]

2. Description of the Related Art A facsimile apparatus is provided with an original reading section for reading information written on the original by a sensor while conveying an original for transmission. In this original reading section, the originals are generally stacked and made to stand by. A method is adopted in which the originals in this original group are conveyed one by one toward the sensor.

A document feeding unit for feeding and conveying the stacked documents one by one toward a sensor in a document reading unit provided in a facsimile apparatus will be described with reference to FIG. FIG.
In FIG. 1, 1 is a document group Pa formed by stacking a plurality of documents P
A document table 2 on which a sheet group Pa is mounted is provided on the downstream side of the document table 1 in the document transporting direction, and a kick roller 3 on which a sheet group Pa is placed and transported by rotation is conveyed by a kick roller 3 to the kick roller 2. It is a sheet feeding roller that is located on the downstream side in the direction and carries the sheet group Pa conveyed by the kick roller 2 by rotation.

These kick roller 2 and paper feed roller 3
Is rotated in the direction in which the document P is conveyed by a rotation driving device (not shown). The support member 8 is rotatably provided on the support member 8 in a direction of approaching and separating from the sheet feeding roller 3, and an elastic force is applied by the compression coil spring 5 in a direction of approaching the sheet feeding roller 3 so that the sheet feeding roller 3 is provided. The separator is in pressure contact with the surface of the.

When the originals are supplied by the original supply section, a plurality of originals P are stacked on the original base 1 and placed on the original base 1, and the operator manually pushes the original group Pa to kick the originals. It is placed on the surface of the roller 2 and moved to the surface of the paper feed roller 3. Then, an original detection sensor (not shown) provided in the vicinity of the paper feed roller 3 causes the original P to be placed on the paper feed roller 3.
Is detected, and a detection signal is output, and the rotation driving device rotates the kick roller 2 and the paper feed roller 3 in the direction in which the document group Pa is conveyed forward by the detection signal.
As a result, the kick roller 2 and the paper feed roller 3 apply a conveying force to the document group Pa, and the separating member 4 cooperates with the paper feed roller 3 to remove the paper P from the paper P located closest to the paper feed roller 3 in the document group Pa. Separate and transport the sheets one by one.

By the way, in the combination of the paper feed roller 3 and the separating body 4, the two work together to separate and carry the paper P one by one from the paper P in the position closest to the paper feed roller 3 in the document group Pa. In order to perform the separation work, the document group Pa
For this reason, the separator 4 becomes a resistance. Therefore, it is desired that the kick roller 2 provided in front of the paper feed roller 3 enhances the force for conveying the document group Pa.

Therefore, conventionally, a kick roller presser for pressing the document group Pa on the kick roller 2 has been provided. That is, in FIG. 8, 6 is a kick roller provided on the support member 8 so as to be displaceable in a direction of approaching and separating from the kick roller 2 and having an elastic force applied in a direction of approaching the kick roller 2 by the compression coil spring 7. It is a presser foot.

In this structure, the operator presses and moves the original group Pa as shown in FIG. 8 at the time of feeding the original, and the sheet is fed between the kick roller 2 and the kick roller presser 6 to feed the paper.
Push in to set. As a result, the document group Pa is pressed against the kick roller 2, and by rotating the kick roller 2, a strong conveyance force is exerted against the separating body 4.
Can be added to

[0009]

The provision of the kick roller retainer 6 to which the elastic force is applied in order to increase the conveying force of the kick roller 2 in the original supply section as described above has the following problems. That is, as shown in FIG. 8, when the document group Pa is thick, the document group Pa has high rigidity and the document group P is
Even if a is pushed between the kick roller 2 and the kick roller retainer 6 from the upstream side of the kick roller 2, the document group Pa pushes up the kick roller retainer 6 against the force of the spring 7 and the document group P.
It is possible to set a through the kick roller 2 and the kick roller retainer 6.

However, as shown in FIG. 9, when the document group Pa is thin, the rigidity of the document group Pa is small and the document group Pa is pushed from the upstream side of the kick roller 2 to the kick roller 2 and the kick roller presser 6. Even if the document group Pa is pushed between them, the original document group Pa cannot push up the kick roller presser 6 against the force of the spring 7, and the kick roller presser 6 is bent. For this reason, the document group Pa cannot be passed between the kick roller 2 and the kick roller retainer 6 at the time of feeding the documents and cannot be set.

In order to avoid this problem, the force with which the kick roller presser 6 presses the document group Pa must be reduced, which makes it impossible to increase the conveying force by the kick roller 2 described above.

A first object of the present invention is to provide a sheet conveying device capable of surely conveying a sheet group when the sheet group is thick or thin.

Another object of the present invention is to provide a highly reliable paper transporting device that prevents the paper group from impeding the separation performance of the separator when the paper group is thick.

A further object of the present invention is to provide a sheet conveying device in which the conveying force of the sheet feeding roller is increased when the thickness of the sheet group is thin.

[0015]

According to another aspect of the present invention, there is provided a sheet transporting device, a kick roller for placing a stack of sheets of paper and transporting the same by rotation, and a downstream side of the kick roller in the sheet transport direction. A sheet feeding roller which is placed on a sheet group conveyed by the kick roller and conveys by rotation, and a tip of the sheet group which reaches the sheet feeding roller with an elastic force is pressed against the sheet feeding roller. A separating body that separates and conveys the sheets one by one from the paper near the paper feed roller and a displaceable member in a direction of approaching and separating from the kick roller, and applies an elastic force in a direction of approaching the kick roller. The kick roller presser for pressing the given paper group against the kick roller and the kick roller presser when the thickness of the paper group positioned on the kick roller does not reach a predetermined size. And a stopper that allows the kick roller retainer to press the sheet group when the thickness of the sheet group located on the kick roller exceeds a predetermined size. It is characterized by doing.

According to the structure of the present invention, when the thickness of the sheet group positioned on the kick roller exceeds a predetermined size (when the thickness is thick), the kick roller presser moves the sheet group to the kick roller. In order to hold down, the kick roller can apply a sufficiently large conveying force to the sheet group to surely convey the sheet group to the sheet feeding roller. Also, when the thickness of the paper group located on the kick roller is less than a predetermined size (when the thickness is thin), the stopper regulates the position of the kick roller pressing so that the paper group is not pressed down. For this reason, the operator can press the sheet group when feeding the sheet without being obstructed by the press of the kick roller and push the sheet group to the sheet feeding roller through the kick roller to set the sheet.

According to a second aspect of the present invention, in the sheet conveying apparatus according to the first aspect, when the thickness of the sheet group reaching the sheet feeding roller exceeds a predetermined size, the sheet group has a predetermined thickness. Receive the leading edge of the paper in the part that exceeds the size,
It is characterized in that a paper stopper is provided to prevent the tip from coming into contact with the separating body.

According to the structure of the present invention, when the paper group is thick and the kick roller presser presses the paper group against the kick roller to increase the conveying force by the kick roller, the thickness of the paper group is increased by the paper stopper. Prevents the leading edge of the paper in a portion exceeding a predetermined size from coming into contact with the paper feed roller. Therefore, due to the thick thickness of the paper group and the increase in the conveying force by the kick roller, the paper in the portion of the paper group whose thickness exceeds the predetermined size pushes up the separating body, and It is possible to prevent a situation in which the separation performance is deteriorated.

According to a third aspect of the present invention, in the sheet conveying device according to the first or second aspect, the sheet conveying device is provided so as to be displaceable in a direction of approaching and separating from the kick roller, and has an elasticity smaller than an elastic force applied to the kick roller presser. A sheet feeding roller retainer for pressing a portion of the group of sheets reaching the sheet feeding roller on the upstream side in the sheet conveyance direction to the sheet feeding roller by applying force in a direction approaching the kick roller. To do.

According to the structure of the present invention, when the thickness of the sheet group is thin, the sheet group is pressed against the sheet feeding roller by an elastic force smaller than the elastic force applied to the kick roller retainer by the sheet feeding roller retainer. The force with which the paper roller conveys the paper group can be increased.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment according to the present invention will be described with reference to FIGS.

In this embodiment, the present invention is applied to a document reading section of a facsimile machine. FIG. 1 shows a document reading section of a facsimile apparatus according to a first embodiment of the present invention, and FIGS. 2 and 3 show the positions of a paper feed roller and a kick roller in this document reading section, which are indicated by A- in FIG. FIG. 4 is a cross-sectional view taken along the line A, and FIG. 4 is a schematic front view showing the paper feed roller and the separating body. The spring is omitted in FIG.

In FIG. 1, reference numeral 11 denotes a device case of a facsimile machine, and in the drawing, an upper surface portion of a document reading portion in the device case 11 is shown. 12 is a device case 1
1 is a panel provided on the upper side of 1 so as to be rotatable up and down, and when the panel 12 is closed, the inner surface of the panel 12 is located on the upper side of the upper surface of the apparatus case 11 to form a document conveying path. ing. The upper surface of the apparatus case 11 on the upstream side (right side in the drawing) of the document with respect to the panel 12 is formed as a document table 13 on which a document group Pa formed by stacking documents P is placed.

The structure described below is adopted in the part of the document conveying path which is constituted by the apparatus case 11 and the panel 12 continuously from the document table 13. A kick roller 21 and a paper feed roller 22 are arranged inside the upper surface of the apparatus case 11 along the direction perpendicular to the document transport direction in order from the upstream side in the document transport direction. The kick roller 21 conveys the document group Pa from the document table 13, and the paper feed roller 22 receives the document group Pa conveyed from the kick roller 21 and conveys it further forward. These rollers 21, 2
The reference numeral 2 projects from the opening formed in the upper surface of the apparatus case 11 to the document transport path. The rollers 21 and 22 are rotated in a direction in which the document P is conveyed by a rotation driving device (not shown).

A support member 23 is provided inside the panel 12, and a separator 24 is provided on the support member 23 above the paper feed roller 22. This separator 24
2 to 4, it is formed of a horizontally long plate material shorter than the paper feed roller 22, and is supported by a support member 23 by a shaft 25 so as to be rotatable in a direction of approaching and separating from the paper feed roller 22. The holder 24a is composed of a holder 24a and a pad 24b attached to the holder 24a and contacting the surface of the paper feed roller 22.

The holder 24a of the separator 24 is composed of the support member 2
The compression coil spring 26 provided on the sheet feeding roller 2
The elastic force is applied in the direction of approaching 2, and the pad 2
4b is in pressure contact with the surface of the paper feed roller 22. The separator 24 performs a separating action of pressing the front end of the original group Pa reaching the paper feed roller 22 against the paper feed roller 22 and separating and transporting the originals P located closest to the paper feed roller 22 one by one. Is.

A kick roller retainer 27 is provided on the support member 23 above the kick roller 21. The kick roller retainer 27 is supported by a support member 23 by a shaft 28 so as to be rotatable in a direction toward and away from the kick roller 21. An elastic force is applied to the kick roller presser 27 by the compression coil spring 29 provided on the support member 23 in a direction toward the paper feed roller 22.
The elastic force of the compression coil spring 29 is sufficient by pressing the document group Pa and rotating the kick roller 21 when the document group Pa is thicker than the predetermined S dimension of 0.5 mm. It is a size that can apply various conveying forces.

The separator 24 and the kick roller retainer 27
Through the opening formed on the inner surface of the panel 12 to the original conveying path. Separator 24 and kick roller retainer 27
The means for applying an elastic force to is not limited to the coil spring, and may be a leaf spring or other elastic member.

Further, the support member 23 is provided with a stopper 30 located upstream of the kick roller presser 27 in the document conveying direction to restrict the operation of the kick roller presser 27. The stopper 30 prevents the kick roller presser 27 from pressing the original document group Pa when the thickness of the original document group Pa located on the kick roller 21 does not reach the predetermined size S, and the stopper 30 is positioned on the kick roller 21. It has a function of allowing the kick roller presser 27 to press the original document group Pa when the thickness of the original document group Pa exceeds a predetermined size S dimension.

Here, the predetermined size S of the thickness of the document group Pa means that the kick roller presser 27 pressing the document group Pa causes a practical obstacle to the conveyance of the document group Pa by the paper feed roller 22. It is the size immediately before starting, and is determined by conditions such as the size of the elastic force applied to the kick roller presser 27 and the paper quality of the document P. Here, for example, 0.
It is 5 mm.

That is, when the thickness of the document group Pa is, for example, a predetermined size S dimension of 0.5 mm or less, the kick roller presser 27 is separated from the surface of the kick roller 21 and the upper surface of the document group Pa by the stopper 30. It will not be pressed down. When the thickness of the document group Pa exceeds, for example, 0.5 mm, the kick roller presser 27 separates from the stopper 30 and presses the document group Pa.

In FIG. 1, reference numerals 41 and 42 denote conveyance rollers provided in the apparatus case 11 side by side along the document conveyance direction with respect to the paper feed roller 22 on the downstream side in the document conveyance direction. Reference numeral 43 denotes the conveyance rollers 41 and conveyance rollers. 42 is a reading sensor provided between the sensor and the sensor. The transport rollers 41 and 42 are rotated by a rotation driving device (not shown). 44 and 45 are provided on the panel 12 and are provided with a conveyance roller 41 and a conveyance roller 42.
It is a driven roller that contacts and rotates.

The operation of the document reading section having the above-described structure when the document is supplied will be described.

Here, as shown in FIG. 2, the thickness of the document group Pa is, for example, a predetermined size S dimension of 0.5 mm or less. In this case, the kick roller retainer 27 is rotated by the coil spring 29 in the direction of approaching the kick roller 21 due to the elastic force applied thereto.
Rotational displacement is restricted until it comes into contact with the surface of the.
Therefore, the kick roller presser 27 is separated from the upper surface of the document group Pa and does not press the document group Pa from the upper side.

The operator stacks a plurality of originals P and places them on the original table 13, pushes this original group Pa to place it on the surface of the kick roller 21, and then further moves it to push it to the paper feed roller 22. Set with.

Then, a document detection sensor (not shown) provided in the vicinity of the paper feed roller 21 detects that the document P is placed on the paper feed roller 22 and outputs a detection signal. Rotates the kick roller 21 and the paper feed roller 22 in the direction in which the document group Pa is conveyed forward. Thereby, the kick roller 21 and the paper feed roller 2
2 applies a conveying force to the document group Pa, and the separator 4 cooperates with the sheet feeding roller 3 to separate and convey the sheets P one by one from the sheet P closest to the sheet feeding roller 3 in the document group Pa.

The document group Pa is shown on the surface of the paper feed roller 22 in FIG.
As shown in (3), since the contact is made at the tangent point D, it is possible to carry the sheet with a relatively small force. Therefore, it is possible to convey the document group Pa only by the rotating force of the sheet feeding roller 22 and the rotating force of the kick roller 21. That is, when the thickness of the document group Pa is small, the paper feed roller 22 bears the main transport force to transport the document group Pa.

Further, as shown in FIG. 1, the original P is rotated by the conveying rollers 41 and 42 and the driven rollers 44 and 45, passes over the reading sensor 43, and is outside from between the apparatus case 11 and the panel 12. Is discharged to. At this time, the reading sensor 43 reads the information written on the document P.

As described above, the thickness of the document group Pa positioned on the kick roller 21 is, for example, a predetermined size S dimension 0.5 mm.
In the following cases (when the thickness is thin), the kick roller presser 27 moves the document group Pa so that the stopper 30 restricts the position of the kick roller presser 27 and does not press the document group Pa. It does not become a resistance in the above. Then, the document group Pa can be reliably conveyed by the paper feed roller 22.

Next, a case where the thickness of the document group Pa exceeds, for example, a predetermined size S dimension of 0.5 mm will be described. In the case of supplying the originals, the operator stacks a plurality of originals P and places them on the original table 13, and pushes the original group Pa to place it on the surface of the kick roller 21 to press the kick roller 21 and the kick roller presser. Push between 27 and. In this case, as shown in FIG. 3, the kick roller retainer 27 is elastically applied by the coil spring 29 and rotates in a direction approaching the kick roller 21 to hit the upper surface of the document group Pa.

Here, since the original document group Pa is thick and has rigidity, the kick roller presser 27 is pushed up to be separated from the stopper 30 and rotationally displaced in the direction away from the kick roller 21. As a result, the kick roller presser 27 presses the document group Pa located on the kick roller 21 against the kick roller 21. Further, the document group Pa is moved and pushed to the paper feed roller 22 for setting.

Then, the document detection sensor detects that the document P is placed on the paper feed roller 22 and outputs a detection signal, and the rotation driving device causes the kick roller 21 and the paper feed roller 22 to read the document by the detection signal. The group Pa rotates in the direction of forward conveyance. As a result, the kick roller 21 and the paper feed roller 22 apply a conveying force to the document group Pa, and the separating member 4
Cooperates with the paper feed roller 3 to separate and convey the paper P from the paper P located closest to the paper feed roller 3 in the document group Pa one by one.

In this case, the kick roller presser 27, to which the elastic force is applied, presses the original document group Pa against the kick roller 21, so that the rotational force of the kick roller 21 is sufficiently applied to the original document group Pa so that the kick roller 21 can operate the original document. The power to convey the group Pa is increased.

When the document group Pa is thick and does not come into contact with the surface of the paper feed roller 22 at the tangential position but the leading edge comes into contact with the E position, the kick roller presser 27 moves the document group Pa on the kick roller 21. It is effective to press and increase the carrying force of the kick roller 21. Then, if necessary, the elastic force of the coil spring 29 is increased to further improve the carrying capacity.

As described above, when the thickness of the document group Pa positioned on the kick roller 21 exceeds, for example, a predetermined size S dimension of 0.5 mm (when the thickness is thick), the kick roller presser 27 is used.
In order to press the document group Pa against the kick roller 21,
The kick roller 21 has a large force to convey the document group Pa, and the document group Pa can be reliably conveyed to the paper feed roller 22. That is, when the original group Pa is thick, the kick roller 21 bears the main conveying force to convey the original group Pa.

As described above, in this embodiment, the kick roller 21 has a main conveying force according to the thickness of the document group Pa.
The paper feed roller 22 is shared by the paper feed rollers 22, and an original reading unit for surely feeding the originals P one by one to the sensor 43 and reading the originals can be obtained regardless of the thickness of the original group Pa.

Next, a second embodiment will be described with reference to FIGS.

In this embodiment, a paper stopper and a paper feed roller retainer are provided in the document reading section of the facsimile apparatus according to the embodiment shown in FIGS. 5 to 7, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals. 5 and 6 are sectional views taken along the lines BB and CC of FIG. 7 showing the position of the paper feed roller and the kick roller in this document reading section.
FIG. 4 is a front view schematically showing a paper feed roller, a separator, a paper stopper, and a paper feed roller retainer. The spring is omitted in FIG. 7.

In FIGS. 5 and 7, reference numeral 51 is a document stopper which is an example of a paper stopper. When the thickness of the document group Pa reaching the paper feed roller 22 exceeds a predetermined size S dimension of 0.5 mm, the document stopper P is used for the document group P.
In a, the front end of the original P1 in the portion where the thickness S dimension exceeds 0.5 mm is received, and the front end of the original P1 is separated by the separating member 2.
It prevents you from touching 4. In this embodiment, the document stoppers 51 are positioned outside the lengthwise ends of the paper feed roller 22 as shown in FIG.
Mounted on

This document stopper 51 is intended for a document group Pa whose thickness exceeds a predetermined size S dimension of 0.5 mm. A document group Pa whose thickness exceeds a predetermined size S dimension of 0.5 mm is set by the kick roller presser 27 by the kick roller 21.
The sheet is pressed against and is conveyed to the sheet feeding roller 22 by the rotation of the kick roller 22. Then, the leading edge of the document P1 in the portion of the document group Pa whose thickness exceeds 0.5 mm hits the sheet stopper 51 and is prevented from moving forward. That is, the leading edge of the document P1 in the portion of the document group Pa whose thickness exceeds 0.5 mm is prevented from hitting the separating body 24.

That is, when the original document group Pa is thick and the kick roller presser 27 presses the original document group Pa against the kick roller 21 to increase the conveying force by the kick roller 21, the original document stopper is thickened in the original document group Pa. The front end of the document group P1 in the portion P1 where the size exceeds the predetermined size is prevented from colliding with the separating body 24.

Therefore, due to the fact that the original group Pa is thick and the conveyance force by the kick roller 21 is increased, the originals in the portion P1 where the thickness exceeds the predetermined size in the original group Pa are separated. Body 24 pushed up to separate body 24
It is possible to prevent the occurrence of a situation in which the separation performance is deteriorated due to.

In the document group Pa, a portion having a predetermined thickness S and a dimension of 0.5 mm or less is separated and conveyed one by one by the paper feed roller 22 and the separating body 24. Along with this, the originals P1 in the portion of the original group Pa whose thickness exceeds a predetermined size are also sequentially separated and conveyed one by one.

In FIGS. 5 and 6, reference numeral 52 is a paper feed roller retainer. The paper feed roller retainer 52 is used for the paper feed roller 2
The sheet feeding roller 22 presses the upstream side of the original sheet conveyance direction with respect to the leading edge of the original group Pa that has reached 2. In this embodiment, the paper feed roller retainer 52 is located upstream of the separating body 24 in the original conveying direction and is arranged along the axial direction of the paper feed roller 22, and is moved toward and away from the paper feed roller 22 by the shaft 53. It is supported by the support member 23 so as to be rotatable in the direction. As shown in FIG. 6, both ends of the paper feed roller retainer 52 in the length direction are in contact with the surfaces of both ends of the paper feed roller 22.

Then, both ends in the lengthwise direction of the paper feed roller retainer 52 are provided with elastic force in the direction of approaching the paper feed roller 22 by the compression coil springs 54 provided on the support member 23, and the surface of the paper feed roller 22 is covered. The document group Pa located at is pressed against and touched from above. The spring force of the compression coil spring 54 applies the compression coil spring 2 to the kick roller retainer 27.
It is set so as to be smaller than the spring force of 9. The compression coil spring 29 is not shown in FIG.

The operation of the paper feed roller retainer 52 will be described below. The paper feed roller retainer 52 presses the document group Pa reaching the paper feed roller from the upper side, and is particularly effective when the thickness S dimension of the document group Pa is 0.5 mm or less. That is, a document group P having a predetermined size S and a size of 0.5 mm or less
a is not pressed against the kick roller 21 by the kick roller presser 27 and is fed by the kick roller 21 by the kick roller 21.
Transported to

Then, the document group Pa is conveyed to the separating body 24 through the space between the surface of the paper feed roller 22 and the paper feed roller retainer 52 which is in contact with the surface of the paper feed roller 22 by the compression coil spring 54. .

By pressing the document group Pa against the paper feed roller 22 by the paper feed roller retainer 52 in this manner, the rotational force of the paper feed roller 22 is sufficiently applied to the document group Pa so that the paper feed roller 22 can move the document group Pa. The carrying power can be increased. In this case, since the spring force (elastic force) applied to the paper feed roller presser 52 is smaller than the elastic force applied to the kick roller presser 27, a thin original group Pa is fed to the paper feed roller 22 and the paper feed roller 22. It does not hinder the insertion between the roller retainer 52 and the roller retainer 52.

The present invention is not limited to the above-described embodiments, but can be modified in various ways. The sheet conveying apparatus of the present invention is most suitable as a document reading section of a facsimile machine, but is not limited to this, and can be widely applied to an apparatus for conveying stacked sheets while separating them.

[0060]

According to the paper transporting device of the first aspect of the invention, when the thickness of the paper group is large, the kick roller presses the paper group against the kick roller so that the kick roller carries the paper group. The force is great and the paper group can be reliably conveyed to the paper feed roller. Further, when the thickness of the paper group located on the kick roller is small, the operator regulates the position of the kick roller presser so that the stopper does not press the paper group. It is possible to set by moving the group of sheets from the kick roller to the sheet feeding roller without being hindered by the kick roller pressing.

According to the second aspect of the present invention, when the thickness of the sheet group is large and the kick roller presser presses the sheet group against the kick roller to increase the conveying force by the kick roller, the sheet stopper makes the sheet group thicker. It prevents the leading edge of the paper in the portion where the size exceeds a predetermined size from hitting the separating body. For this reason, since the thickness of the paper group is large and the conveyance force by the kick roller is increased, the paper in the portion of the paper group whose thickness exceeds the predetermined size pushes up the separator, and the separation performance by the separator is increased. It is possible to prevent the occurrence of the situation of lowering.

According to the invention of claim 3, when the thickness of the sheet group is thin, the sheet group is pressed against the sheet feeding roller with an elastic force smaller than the elastic force applied to the kick roller pressing by the sheet feeding roller presser. It is possible to increase the force with which the sheet feeding roller conveys the sheet group.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a document reading unit of a facsimile apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a paper feed roller and a kick roller arrangement section in the document reading section of the embodiment.

FIG. 3 is a cross-sectional view showing a paper feed roller and a kick roller arrangement section in the document reading section of the embodiment.

FIG. 4 is a front view showing a paper feed roller and a kick roller arrangement section in the document reading section of the embodiment.

FIG. 5 is a cross-sectional view showing a paper feed roller and a kick roller arrangement portion in a document reading portion of a facsimile apparatus according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a paper feed roller and a kick roller arrangement section in the document reading section of the embodiment.

FIG. 7 is a front view showing a paper feed roller and a kick roller arrangement portion in the document reading portion of the embodiment.

FIG. 8 is a cross-sectional view showing a paper feed roller and a kick roller arrangement portion in a document reading portion of a conventional facsimile machine.

FIG. 9 is a cross-sectional view showing a paper feed roller and a kick roller arrangement portion in a document reading portion of a conventional facsimile apparatus.

[Explanation of symbols]

 11 ... Device case 12 ... Panel, 13 ... Original plate, 21 ... Kick roller, 22 ... Paper feed roller, 23 ... Support member, 24 ... Separation body, 26 ... Coil spring (elastic body), 27 ... Kick roller presser, 29 ... Coil spring (elastic body), 30 ... Stopper, 51 ... Paper stopper, 52 ... Paper feed roller retainer, 54 ... Coil spring (elastic body).

Claims (3)

[Claims] 1. A kick roller for stacking and stacking sheets of paper and conveying the same by rotation, and a sheet of paper positioned downstream of the kick roller in the sheet conveying direction and conveyed by the kick roller. A sheet feeding roller that conveys by rotation and a front end of a sheet group that has reached the sheet feeding roller due to an elastic force is pressed against the sheet feeding roller and separated one by one from the sheet closest to the sheet feeding roller. A kick roller retainer that is provided so as to be displaceable in a direction in which it comes close to and away from the kick roller, and that is provided with elastic force in a direction approaching the kick roller and presses the sheet group against the kick roller. And when the thickness of the sheet group positioned on the kick roller does not reach a predetermined size, the kick roller retainer prevents the sheet group from being pressed. A sheet conveying device, comprising: a stopper that allows the kick roller retainer to press the sheet group when the thickness of the sheet group located on the kick roller exceeds a predetermined size. 2. When the thickness of the paper group reaching the paper feed roller exceeds a predetermined size, the front end of the paper in the portion of the paper group whose thickness exceeds the predetermined size is received, and The sheet conveying device according to claim 1, further comprising a sheet stopper that prevents the leading end from coming into contact with the separating body. 3. The sheet feeding device is provided so as to be displaceable toward and away from the kick roller, and an elastic force smaller than an elastic force applied to the kick roller presser is applied in a direction approaching the kick roller. 3. The sheet conveying device according to claim 1, further comprising a sheet feeding roller retainer that retains a portion of the sheet group that has reached the rollers on the upstream side in the sheet conveying direction with respect to the sheet conveying direction.