JP2001199584A - Sheet material feeding device and sheet material processing device - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To prevent a leading edge of a bundle of documents from falling out of a nip between a sheet feeding roller and a separation pad when a document bundle is set on a sheet feeding tray. A sheet feeding roller (106A, 106B) is disposed on both sides of a sheet feeding roller (105). Separation pad holder 10 rotatably mounted on support shaft 116
7 is urged upward by a pressurizing spring 117 and is in contact with the paper feed roller at a predetermined pressure. Reference numeral 118 denotes a separation pad bonded to the upper surface of the holder 107. FIG. 1 shows a state in which the paper feed roller 105 is in a standby state. When the paper feed roller 105 stops rotating at the illustrated home position, the stopper piece 130 incorporated in the paper feed roller protrudes from the paper feed roller, and the paper feed roller and the holder. Blocking the path between. Therefore, when the original bundle P is set on the paper feed tray 103, the leading end of the original bundle does not fall downstream from the nip between the paper feed roller and the separation pad.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus provided in a sheet processing apparatus for performing a predetermined process on sheet materials fed one by one.

A representative sheet material processing apparatus is, for example, an image reading apparatus for reading an image of a document (sheet material) fed one by one, or a recording apparatus fed one sheet at a time. There is an image forming apparatus (a printer, a copying machine, a facsimile, etc.) for forming an image on a material (sheet material).

[0003]

2. Description of the Related Art FIG. 8 shows an overall configuration of a conventional image reading apparatus.

First, main members constituting the image reading apparatus 100A will be described. Note that FIG.
Please refer to FIG.

[0005] The image reading apparatus 100A includes a main body 10 of the apparatus.
1, a cover 102, a sheet feeding tray (sheet material stacking means) 103, side regulating plates 104A and 104B, a sheet feeding roller 105, sheet feeding rollers 106A and 106B, a separation pad holder 107, a sheet The apparatus includes a material detection sensor (photo interrupter) 108, a sensor lever 109, an image reading sensor 110, and a transport roller 111.

The apparatus main body 101 is of a vertical type, and a document bundle P
Is set in an inclined state, and moves downward from above. A paper feed tray 103 is mounted (fixed) on the upper part of the apparatus main body 101.

The cover 102 is attached to the apparatus main body 101 so as to be rotatable about a lower support shaft 112. The cover 102 opens when rotated in the direction of arrow a, and closes when rotated in the direction of arrow b. FIG. 8 shows a state in which the cover 102 is closed. This cover 1
The image reading sensor 110 is attached to the 02 side.

The image reading sensor 110 is movable up and down, and is urged downward by a pressure spring 113. When the cover 102 is in the state shown in FIG. 8 (closed state), the image reading sensor 110
1 is in contact with a predetermined pressure.

The side regulating plates 104A and 104B are attached to the paper feeding port 114 of the apparatus main body 101 so as to be movable in the width direction of the document bundle P. These side regulating plates 104A and 104B regulate both end positions in the width direction of the document bundle P inserted from the paper supply port 114 and set on the paper supply tray 103.

The paper feed roller 105 is non-rotatably mounted on a paper feed shaft 115 rotatably mounted on the apparatus main body 101, and rotates integrally with the paper feed shaft 115. It has become. This paper feed roller 1
Reference numeral 05 denotes a half-moon roller, and FIG. 8 shows a state in which the paper feed roller 105 stops rotating at the home position. At this time, the cutout portion 105 a of the paper feed roller 105 faces the separation pad holder 107. When there is a sheet feeding command, the sheet feeding roller 105 stops one rotation clockwise from the home position. The document is fed by this one rotation.

Paper feed rollers 106A and 106B are rotatably mounted on both sides of a paper feed roller 105 on a paper feed shaft 115. The paper feed rollers 106A and 106B
Is slightly smaller than the outer diameter of the paper feed roller 105.

The separation pad holder 107 is used for the main body 101 of the apparatus.
On the other hand, it is mounted so as to be rotatable up and down around a support shaft 116 on the rear end side, and is urged upward by a pressure spring 117. Paper feed roller 10
When the rotation is stopped at the home position, the separation pad holder 107 is in contact with the paper feed rollers 106A and 106B at a predetermined pressure. A separation pad 118 is adhered to the upper surface of the separation pad holder 107. The separation pad 118 is in contact with the sheet feed rollers 106A and 106B.

A sensor lever 109 is provided at a position downstream of the paper feed roller 105 and upstream of the document reading sensor 110. The sensor lever 109 is attached to the apparatus main body 101 so as to be rotatable around a support shaft 119. Paper feed roller 105 and original reading sensor 110
When there is no original in the path between
As shown in FIG. At this time,
Flag 120 integrated with sensor lever 109
Indicates that the optical path of the sheet material detection sensor 108 is blocked, and the sensor 108 is off. Note that the sensor 108 is installed on a control board (control unit) not shown.

The transport roller 111 is rotatably attached to the apparatus main body 101, and rotates in a counterclockwise direction when there is a paper feed command to rotate the document fed by the paper feed roller 105 to a predetermined position. Conveyed at the speed of

Next, the operation will be described.

The side regulating plates 104A and 104B are moved to the width of the original, and the original bundle P is set on the paper feed tray 103. At this time, the leading end of the document bundle P is inserted from the paper feed port 114, and the paper feed rollers 106A and 106B and the separation pad 118 are inserted.
To the nip. As a result, a paper feed standby state (the state shown in FIG. 8) is established.

When a paper feed command is issued, the paper feed roller 105
Rotate. As a result, the uppermost document of the stacked document bundle P is separated into one sheet and fed. The fed original moves by pushing down the sensor lever 109. When the sensor lever 109 is pushed down (turned counterclockwise), the flag 120 is set to the sheet material detection sensor 108.
And the sensor 108 is turned on. After a lapse of a predetermined time from this point, the controller reads the image reading sensor 110
Is sent to the image reading sensor 110
Is started.

At this time, the leading end of the document has already passed through the nip between the image reading sensor 110 and the transport roller 111, and the document is being transported by the transport roller 111. The document that has been read by the image reading sensor 110 is the output port 1
It is discharged out of the machine from 21 (FIG. 10 shows this state).
.

The sensor lever 109 which has been continuously pushed down by the document returns to its original position (the position shown in FIG. 8) when the rear end of the document passes. As a result, the flag 120
Block the light path of the sensor 108 again, and the sensor 108 is turned off. After a lapse of a predetermined time from this point, a reading end command is sent from the control unit to the image reading sensor 110, and the reading operation by the image reading sensor 110 stops.

[0020]

However, the paper feeder portion of the conventional image reading apparatus 100A has the following problems. That is, the leading end of the original bundle P set on the paper supply tray 103 abuts on the nip between the paper supply rollers 106A and 106B and the separation pad 118. At this time, the original bundle P is pressed with a stronger force than the urging force of the pressure spring 117. When the leading end of P is pushed in, the separation pad holder 107 rotates in a direction away from the sheet feeding rollers 106A and 106B, and a gap is formed between the sheet feeding rollers 106A and 106B and the separation pad 118, so that the leading end of the document bundle is downstream from the nip. May escape. FIG. 11 shows this state. Such a case is likely to occur when the document is thick paper or when the document is in a thick bundle. this is,
This is because the waist of the bundle of originals is strong.

As described above, when the leading end of the bundle of documents P set on the paper feed tray 103 is protruded downstream from the nip between the paper feed rollers 106A and 106B and the separation pad 118,
Problems such as the occurrence of double feed and the detection of stagnant jam occur. As shown in FIG. 11, when the leading end of the bundle of originals that has fallen out of the nip pushes down the sensor lever 109, the sensor 108 is turned on, so that a stagnant jam is detected.

The leading end of the original bundle P set on the paper feed tray 103 is provided with the paper feed rollers 106A and 106B and the separation pad 1
18, but in this case, it is likely to be set diagonally because it collides at the center of the leading end of the document bundle P. Therefore, the document is fed skewed as shown in FIG.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a sheet material feeding apparatus capable of setting a sheet material bundle in a correct state.

[0024]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a sheet material stacking means for mounting a sheet material bundle, and a sheet material bundle set on the sheet material stacking means. And a sheet feed roller that feeds the sheet material by making one rotation at the leading end position of the sheet material.

According to the present invention, in order to achieve the above object, the sheet feeding roller projects from the sheet feeding roller when the sheet feeding roller is in a stopped state at the home position and is set on the sheet bundle stacking means. A sheet supply path blocking member that blocks the sheet supply path at a position slightly downstream of the leading end position of the set sheet material bundle is provided.

According to the present invention, in order to achieve the above object, a holder member that rotates in synchronization with the paper feed roller is provided on a paper feed shaft supporting the paper feed roller, and the paper feed roller is provided with a holder member. When the rotation is stopped at the home position, the sheet feeding protrudes from the holder member and interrupts the sheet feeding path at a position slightly downstream of the leading end position of the sheet bundle set on the sheet bundle placing means. A road blocking member is provided.

For example, the sheet feeding path blocking member enters the sheet feeding roller or the holder member when receiving the pressing force from the sheet material, and the sheet feeding roller when the pressing force from the sheet material is released. Projecting from the inside or from the inside of the holder member.

For example, the holder members are provided one by one at least at positions sandwiching the paper feed roller. Further, the holder member is movable along the paper feed axis.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 shows the overall configuration of an image reading apparatus to which the present invention is applied.

The basic configuration of the image reading apparatus 100B is not different from the conventional image reading apparatus 100A. Therefore, here, only the differences (the invention part) will be described.

In the image reading apparatus 100B, measures are taken to prevent the leading end of the document bundle P set on the paper feed tray 103 from falling out of the nip between the paper feed rollers 106A and 106B and the separation pad 118. ing.

Here, a stopper piece (feeding path blocking member) 130 incorporated in the feeding roller 105 cuts off a path between the feeding rollers 106A and 106B and the separation pad holder 107, so that the sheet is set at the time of setting. Is prevented from falling out of the nip between the sheet feed rollers 106A and 106B and the separation pad 118 downstream.

FIG. 1 shows a state at the time of paper feed standby. At this time, the paper feed roller 105 has stopped rotating at the home position, and is in a state where it cannot rotate. The stopper piece 130 protrudes from the inside of the paper feed roller 105 in this state by a predetermined length (see FIG. 2), and blocks the path between the paper feed rollers 106A and 106B and the separation pad holder 107. A tangential groove 131 is formed in the feed roller 105, and a coil spring 132 and a stopper piece 130 are fitted in the groove 131.

FIG. 3A shows a state at the time when a certain time has elapsed from the start of sheet feeding. From the start of sheet feeding to this point, the stopper piece 130 rotates while projecting a predetermined length. Then, when it rotates to the position shown in FIG. 3A, it comes into contact with the original bundle P and receives a pressing force from the original bundle P.
As a result, the stopper piece 130 enters the paper feed roller 105 (groove 131) while contracting the coil spring 132, and the protrusion length gradually decreases.

FIG. 3B shows a state at the time when the paper feed roller 105 completes one rotation and stops rotating at the home position. The stopper piece 130 is being pushed into the paper feed roller 105 by the document passing through the paper feed roller 105, but when the rear end of the document passes the paper feed roller 105, the stopper piece 130 is urged by the coil spring 132. It protrudes from the paper feed roller 105 and again shuts off the path between the paper feed rollers 106A and 106B and the separation pad holder 107.

<Second Embodiment> FIG. 4 shows the overall structure of another image reading apparatus to which the present invention is applied.

The image reading apparatus 100B of FIG. 1 and the present image reading apparatus 100C differ only in a part of the configuration, and therefore, only the different parts will be described here.

Here, a stopper piece (feeding path blocking member) 140 incorporated in the feeding roller 105 cuts off a path between the feeding rollers 106A and 106B and the separation pad holder 107, so that the sheet can be set at the time of setting. Is prevented from falling out of the nip between the sheet feed rollers 106A and 106B and the separation pad 118 downstream.

FIG. 4 shows a state at the time of paper feed standby. At this time, the paper feed roller 105 has stopped rotating at the home position. The stopper piece 140 projects a predetermined amount from the inside of the sheet feeding roller 105 in this state, and
06B and the separation pad holder 107 are blocked. The notch 105 a of the sheet feeding roller 105 has a concave portion 14.
1 is formed, and a stopper piece 140 is attached to the torsion coil spring 142 in the concave portion 141.

FIG. 5A shows a state at the time when a predetermined time has elapsed from the start of sheet feeding. From the start of sheet feeding to this point, the stopper piece 140 rotates while projecting a predetermined amount. Then, when it rotates to the position shown in FIG. 5A, it comes into contact with the original bundle P and receives a pressing force from the original bundle P.
Thereby, the stopper piece 140 is connected to the torsion coil spring 14.
2, the sheet 2 enters the sheet feeding roller 105 (concave section 141) while being compressed, and the amount of protrusion gradually decreases.

FIG. 5B shows a state at the time when the paper feed roller 105 completes one rotation and stops rotating at the home position. The stopper piece 140 is in a state of being pushed into the paper feed roller 105 by the document passing through the paper feed roller 105, but when the rear end of the document passes the paper feed roller 105, the stopper piece 140 is urged by the torsion coil spring 142. Feeding roller 1
05, the path between the sheet feeding rollers 106A and 106B and the separation pad holder 107 is again blocked.

In the case of this configuration, when the stopper piece 140 receives a pressing force from the document bundle P, the stopper piece 140 rotates smoothly and rotates.
5, the original is not strongly rubbed and damaged.

<Third Embodiment> FIG. 6 shows the overall structure of still another image reading apparatus to which the present invention is applied.

Here, differences from the image reading apparatus 100B of FIG. 1 will be described.

In the image reading apparatus 100B shown in FIG.
Although the stopper piece 130 is incorporated in the paper feed roller 105, as shown in FIG. 7, in the present image reading apparatus 100D, roller-shaped holder members 150A and 150B are provided on both sides of the paper feed roller 105, respectively. This holder member 15
0A and 150B are provided with stopper pieces 13 having the same configuration as that of FIG.
0 is incorporated.

Here, the holder members 150A, 15A
OB is mounted on the paper feed shaft 115 in a non-rotatable and slidable manner. Holder members 150A, 15
When the paper feed roller 105 stops rotating at the home position, the stopper piece 130 incorporated in the OB is set in FIG.
In the same position as

The holder members 150A and 150B are arranged near both sides in the width direction of the original bundle P as shown in FIG. In this manner, the leading end of the document bundle P inserted from the paper feed port 114 has both sides in the width direction at the holder member 150.
A, 150B abut against the stopper pieces 130, 130, so that the document bundle P is set without being inclined,
No skew occurs.

In this case, one holder member 150A and one holder member 150B are provided on both sides of the sheet feeding roller 105, but may be increased as needed. Further, when the holder members 150A and 150B are provided,
Also, the stopper pieces (130, 140) of FIGS. 1 and 4 may be provided. Further, the stopper members 140 of FIG. 4 may be provided on the holder members 150A and 150B.

[0050]

As described above, according to the present invention,
When the feed roller stops rotating at the home position,
Since the sheet feeding path blocking member incorporated in the sheet feeding roller or the holder member shuts off the sheet feeding path, the leading end of the set sheet material bundle does not come out downstream of the sheet feeding roller, and the sheet material bundle is prevented. Can be set to the correct state. For this reason, troubles such as detection of double feed and stagnant jam do not occur. Further, by disposing the holder members on both sides in the width direction of the sheet bundle, the sheet bundle at the time of setting does not become skewed and skew does not occur.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating the overall configuration of an image reading apparatus to which the present invention has been applied.

FIG. 2 is a perspective view illustrating a configuration of a paper feed roller.

FIG. 3 is a sectional view of a main part for explaining the operation of a stopper piece.

FIG. 4 is a cross-sectional view illustrating the overall configuration of another image reading apparatus to which the present invention is applied.

FIG. 5 is a sectional view of an essential part for explaining the operation of a stopper piece.

FIG. 6 is an external perspective view illustrating a configuration of still another image reading apparatus to which the present invention is applied.

FIG. 7 is a perspective view showing a configuration of a holder member.

FIG. 8 is a cross-sectional view illustrating the overall configuration of a conventional image reading apparatus.

FIG. 9 is a perspective view illustrating a configuration of a sheet feeding roller.

FIG. 10 is a sectional view for explaining the operation of the image reading apparatus of FIG. 8;

FIG. 11 is a sectional view showing a problem of the image reading apparatus of FIG. 8;

FIG. 12 is an external perspective view showing a problem of the image reading apparatus of FIG. 8;

[Explanation of symbols]

103 paper feed tray (sheet material bundle mounting means) 105 paper feed roller 130, 140 stopper piece (paper feed path blocking member) 150A, 150B holder member P document bundle (sheet material bundle)

Continued on the front page (72) Inventor Hideto Chino 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term (reference) in Canon Inc. 3F343 FA02 FB01 GA02 GA04 GB01 GC01 GD01 JA04 JA11 JD08 KA06 KA13 KA14 LC17 LD04

Claims (6)

[Claims] 1. A sheet material stacking means for mounting a sheet material bundle, and a sheet feeding means for feeding the sheet material by rotating once at a tip position of the sheet material set on the sheet material mounting means. A sheet material feeding device having a paper roller, wherein the sheet material set protruding from the inside of the paper supply roller and set on the sheet material placement means when the paper supply roller is in a stopped state at the home position. A sheet feeding path blocking member for blocking a sheet feeding path at a position slightly downstream of a leading end position of the sheet material feeding apparatus. 2. A sheet material placing means for placing a sheet material bundle, and a sheet material is fed by rotating once at a tip position of the sheet material set on said sheet material bundle placing means. In a sheet material feeding device having a paper feed roller, a holder member that rotates in synchronization with the paper feed roller is provided on a paper feed shaft that supports the paper feed roller, and the paper feed roller is at a home position. When in the state of rotation stop,
A sheet supply path blocking member that protrudes from the inside of the holder member and blocks a sheet supply path at a position slightly downstream of a leading end position of the sheet bundle set on the sheet bundle placement unit is provided. Sheet material feeding device. 3. The sheet feeding path blocking member enters the sheet feeding roller or the holder member when receiving a pressing force from a sheet material, and the sheet feeding roller when the pressing force from the sheet material is released. The sheet material feeding device according to claim 1, wherein the sheet material feeding device protrudes from the inside or from the inside of the holder member. 4. The sheet feeding apparatus according to claim 2, wherein the holder members are disposed one by one at least at positions sandwiching the sheet feeding roller. 5. The sheet feeding device according to claim 4, wherein the holder member is movable along the sheet feeding shaft. 6. A sheet material processing apparatus for performing a predetermined process on sheet materials fed one by one, as means for feeding the stacked sheet materials one by one. A sheet material processing apparatus, comprising: the sheet material feeding apparatus according to any one of the claims.