JPH05178483A - Automatic paper sheet feeding device - Google Patents

Abstract

PURPOSE:To prevent the double feed of paper sheets by a method wherein a second paper sheet attracted to a first paper sheet owing to static electricity is pulled out from a paper sheet bundle in a state to be accompanied by the first paper sheet. CONSTITUTION:A first paper sheet 14 delivered from a paper sheet bundle 1 by means of a first paper sheet feed roller 3 is delivered to an inputting roller 6 in an image recording device 7. When an automatic paper sheet feeding device is released from paper sheet feeding operation, a felt 18 is pressed against a second paper sheet 15 exposed on the surface of the paper sheet bundle 1 through the force of a left spring 17. Since the second paper sheet 15 attracted to the first paper sheet 14 owing to static electricity is prevented from being pulled out from the paper sheet bundle 1 in a state to be accompanied by the first paper sheet 14, only the first paper sheet 14 is fed to the image recording device 7 and the double feed of the paper sheets to the image recording device 7 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic paper feeding device for feeding recording paper taken out one by one from a bundle of paper to a recording device such as a copying machine, a facsimile or a printer.

[0002]

2. Description of the Related Art In order to continuously supply a recording paper to an image recording apparatus such as a copying machine, a facsimile machine, a printer, etc., a long recording paper of a constant width is rolled into a fixed size instead of a roll. When using a bundle of cut recording papers, the recording papers must be taken out one by one from the paper bundle. Further, in order to continuously supply originals to an image reading apparatus such as a copying machine, a facsimile, a printer, it is necessary to take out the originals one by one from a bundle of originals. Therefore, conventionally, an automatic paper feeder has been proposed for automatically feeding recording paper from the bundle of sheets to the image recording device or automatically feeding the originals from the bundle of documents to the image reading device. Has been done.

FIG. 7 shows the structure of a conventional automatic paper feeding device for continuously feeding recording paper to a recording device. Reference numeral 1 is a recording paper (hereinafter referred to as "paper") cut into a standard size. bundle,
Reference numeral 2 denotes a paper case in which the paper bundle 1 is loaded, 3 is a first paper feed roller that feeds paper from the paper bundle 1 loaded in the paper case 2 to the downstream side in the paper feed direction, and 4 is a feed from the first paper feed roller 3. A second paper feed roller for feeding the received paper further downstream in the paper feed direction,
Reference numeral 5 denotes a paper separating roller which sends out only the first sheet of paper when a plurality of sheets of paper are sent together from the first paper feed roller 3 and prevents the second and subsequent sheets of paper from being sent out. The paper separating roller 5 is installed close to a position facing the second paper feeding roller 4. 6 is the second paper feed roller 4
A pair of recording / conveying rollers for feeding the paper sent from the paper to the image recording device 7, and 8 is a paper push-up plate pivotally mounted on the bottom surface of the paper case 2 on the upstream side in the paper feed direction. A portion of the paper bundle 1 loaded in the paper case 2 on the downstream side in the paper feed direction, that is, a portion located below the first paper feed roller 3 is placed on the raising plate 8. Reference numeral 9 denotes a paper push-up lever pivotally mounted at a position where its free end comes into contact with the lower surface of the paper push-up plate 8, and the paper push-up lever 9 is swung upward in the figure by a driving means. Reference numeral 10 is a paper detection sensor provided downstream of the recording / conveying roller 6 in the paper feed direction, 11 is a drive source for driving the paper separating roller 5, 12 is a friction clutch provided between the paper separating roller 5 and the drive source 11, 13 Is a hole opened in a part of the bottom surface of the paper case 2 that opposes the paper lifting plate 8, and the free end of the paper lifting lever 9 is inserted into this hole 13.

The operation of the conventional example thus configured will be described with reference to FIGS. 8 and 9.

When the image recording device 7 is driven with the paper case 2 loaded with the paper stack 1 attached to the automatic paper feeder,
The push-up lever 9 swings in the direction of arrow P (see FIG. 8),
The free end of the push-up lever 9 inserted in 13 has the paper push-up plate 8
Push up. Therefore, the downstream side of the sheet bundle 1 in the sheet feeding direction rises, and the upper surface of the sheet bundle 1 contacts the first sheet feeding roller 3. Then, the uppermost first sheet 14 of the sheet bundle 1 is pulled out from the sheet bundle 1 downstream in the sheet feeding direction by the first sheet feeding roller 3 rotating in the direction of the arrow Q, and at the same time the second sheet feeding is performed. After being sent to the roller 4, it is further sent to the recording / conveying roller 6 by the second paper feeding roller 4 rotating in the direction of the arrow R, and is supplied to the image recording device 7.

By the way, the friction clutch 12 applies a constant force of the driving source 11 to the paper separating roller 5 so that the paper separating roller 5 rotates in the arrow S direction opposite to the paper feeding direction at the contact surface with the paper. The friction torque value of the friction clutch 12 is
When one sheet of paper is fed between the paper feeding roller 4 and the paper separating roller 5 or when the second paper feeding roller 4 and the paper separating roller 5 directly contact each other, the paper separating roller 5 is It rotates in the direction of the arrow T along with the second paper feed roller 4 so that the distance between the second paper feed roller 4 and the paper separating roller 5 becomes 2
When more than one sheet of paper has been fed, the paper separating roller 5 is set to rotate in the direction of arrow S. Therefore, if only one sheet is fed from the first sheet feed roller 3, the sheet is directly sent to the recording / conveying roller 6 by the second sheet feed roller 4.

However, when two or more sheets are fed from the sheet bundle 1 due to static electricity generated by friction between sheets, etc., only the first sheet 14 is moved by the second sheet feed roller 4. Although it is fed downstream in the paper feed direction, that is, the recording feed roller 6,
When the paper 16 after the second paper 15 comes into contact with the paper separating roller 5, the paper separating roller 5 rotates in the direction of the arrow S, to the downstream side in the paper feeding direction of the paper 16 after the second paper 15. Is blocked. Therefore, even if two or more sheets are fed from the sheet bundle 1, only one sheet is supplied to the recording / conveying roller 6 by the second sheet feeding roller 4 and the sheet separating roller 5.

However, if the state that the paper separating roller 5 is kept close to the second paper feeding roller 4 is kept, the first sheet of paper 14 finishes passing through the second paper feeding roller 4 and at the same time.
The second paper 15 comes into contact with the second paper feed roller 4,
The first sheet of paper 14 is subsequently sent to the recording / conveying roller 6, which causes paper jam.

Therefore, the sheet feeding operation is canceled during the period from the arrival of the first sheet of paper 14 at the recording / conveying roller 6 to the end of the passage of the first sheet feeding roller 3. That is, the paper detection sensor 10
When the first sheet of paper 14 is detected, the paper push-up lever 9 is lowered to separate the sheet bundle 1 from the first paper feed roller 3, and at the same time, the paper separating roller 5 is moved from the second paper feed roller 4 to the second paper feed roller 4. Separate. As a result, the first sheet of paper 14 becomes the recording / conveying roller 6
Is supplied to the image recording device 7 by the second sheet of paper.
Since the paper 16 after 15 does not come into contact with the second paper feed roller 4 and remains on the upstream side of the paper separating roller 5 in the paper feed direction (see FIG. 9), the paper bundles 1 to Only one sheet of paper will be supplied.

[0010]

However, from the time the first sheet of paper 14 reaches the recording / conveying roller 6 to the time it finishes passing the first paper feeding roller 3, the paper separating roller 5 is moved to the second position. Even if the second paper 15 is separated from the paper feed roller 4 of FIG.
There is a problem that the second sheet 15 is also supplied to the image recording device 7 by the recording / conveying roller 6 together with the first sheet 14 when the sheet 15 is adsorbed on the sheet.

Also, when the original is supplied to the image reading device or the like, when the second original is attracted to the first original due to static electricity or the like, as with the paper, the second original is fed. First manuscript
There is a problem that the original is supplied to the image reading device together with the original.

The present invention has been made in order to solve such a problem, and is capable of reliably supplying only one sheet or an original from a bundle of sheets or a set of originals to a recording apparatus or an image reading apparatus. An object of the present invention is to provide a paper feeding device.

[0013]

According to the present invention, when a paper case for loading a paper bundle in which a plurality of sheets of paper are stacked and the surface of the paper bundle come into contact with each other, the paper is sent out from the paper bundle in the paper feeding direction downstream. The first paper feeding unit and a position downstream of the paper case in the paper feeding direction are disposed so as to contact the paper in the same direction as the first paper feeding unit, and the paper is fed from the first paper feeding unit. The second paper feed unit is provided at a position facing and close to the second paper feed unit and the second paper feed unit for further feeding the first sheet of paper that has been made downstream in the paper feed direction. First between means
A paper separating unit that prevents the second and subsequent sheets of paper sent along with the first sheet from being conveyed downstream in the sheet conveying direction, and a second sheet that is located downstream of the sheet separating unit in the sheet conveying direction. A carrying-in means for holding and carrying in the first sheet of paper fed from the feeding means, and a first sheet of paper after the downstream end of the first sheet of paper in the paper feeding direction reaches the carrying-in means. Until the end of the upstream side of the paper feeding direction reaches the first paper feeding means, the first paper feeding means and the first sheet of paper are separated from each other, and the second paper feeding means and the paper sorting are performed. The sheet feeding operation control means for separating the sheet feeding means from the sheet feeding operation and the sheet bundle loaded in the paper case, and the sheet separating means and the second and subsequent sheets of paper are in contact with each other. The stack of paper between the position on the upstream side by the length in the feeding direction and the position on the end on the upstream side in the paper feeding direction of the first sheet when the paper feeding operation is canceled A friction member which is disposed so as to contact the surface, is made of a pressing member for pressing the paper bundle in the friction member.

Further, when the pressing member presses the friction member against the sheet bundle, a restraint member for restraining the movement of the sheet bundle pressed by the pressing member and pressing the friction member against the sheet bundle is also provided.

[0015]

According to the present invention, the first sheet fed from the sheet bundle by the first sheet feeding roller reaches the carry-in roller to the image recording device or the image reading device, and the automatic sheet feeding device is operated. When the paper feeding operation is canceled, the friction member is pressed by the pressing member onto the second sheet of paper appearing on the surface of the sheet bundle, or the second sheet of paper appearing on the surface of the sheet bundle is pressed. By pressing the friction member with the pressing member, it is possible to prevent the second sheet, which is attracted to the first sheet by static electricity or the like, from being pulled out from the sheet bundle along with the first sheet. So
Since only the first sheet of paper is supplied to the image recording device or the image reading device, the double feeding of the paper to the image recording device or the image reading device can be prevented.

[0016]

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

FIG. 1 shows the structure of a first embodiment of the present invention. In FIG. 1, the parts having the same reference numerals as those in FIGS. 7, 8 and 9 show the same parts, and 17, the fixed end is attached to the upper end of the paper case 2 on the upstream side in the paper feeding direction,
The leaf spring 17 is a leaf spring as a pressing member whose free end projects toward the downstream side in the paper feeding direction inside the paper case 2. The leaf spring 17 has a downward spring force F in the drawing. Reference numeral 18 is a felt as a friction member attached to the lower surface of the free end of the leaf spring 17, and the felt 18 is pressed by the leaf spring 17 against the upper surface of the upstream side of the paper bundle 1 loaded in the paper case 2 in the paper feeding direction. Reference numeral 19 is a link for connecting the paper separating roller 5 and the paper lifting lever 9,
Is a solenoid that contacts the lower surface of the paper push-up lever 9 in the figure. By controlling the energization of this solenoid 20,
The paper separating roller 5 and the paper push-up lever 9 are oscillated in a state of being connected in the vertical direction in the figure.

The operation of the present embodiment configured as described above will be described below.
This will be described with reference to FIGS. 1 and 2.

When the image recording device 7 is driven with the paper case 2 loaded with the paper stack 1 attached to the automatic paper feeder,
The push-up lever 9 swings in the direction of arrow P by the solenoid 20, and the free end of the push-up lever 9 inserted in the hole 13 pushes up the paper push-up plate 8. Therefore, the downstream side of the sheet bundle 1 in the sheet feeding direction rises, and the upper surface of the sheet bundle 1 contacts the first sheet feeding roller 3. Then, the uppermost first sheet 14 of the sheet bundle 1 is pulled out from the sheet bundle 1 by the first sheet feed roller 3 rotating in the direction of the arrow Q, and is also delivered to the second sheet feed roller 4. Be done.

At this time, the uppermost first sheet of the sheet bundle 1
Since the upstream portion of 14 in the paper feed direction is pressed by the felt 18 attached to the leaf spring 17, the first paper 14 can be fed by the first paper feed roller 3 from the top of the paper stack 1. In order to achieve, the frictional force generated between the paper feed roller 3 and the first sheet 14 is F ₁ , and the frictional force generated between the felt 18 and the first sheet 14 is F _2. , F ₁ > F
You must have a relationship of ₂ .

By the way, the first sheet of paper 14 sent from the first paper feed roller 3 is sent to the recording / conveying roller 6 by the second paper feeding roller 4 rotating in the R direction. The friction clutch 12 is configured so that the paper separating roller 5 rotates in the arrow S direction opposite to the paper feeding direction on the contact surface with the paper.
A constant force of the drive source 11 is applied to the paper separating roller 5, and the friction torque value of the friction clutch 12 is such that one sheet is fed between the second paper feeding roller 4 and the paper separating roller 5. When
Alternatively, when the second paper feed roller 4 and the paper separating roller 5 are in direct contact with each other, the paper separating roller 5 rotates in the direction of arrow T along with the second paper feeding roller 4, and the second paper feeding roller 4 When two or more sheets of paper are fed between the sheet separating roller 5 and the sheet separating roller 5, the sheet separating roller 5 is set to rotate in the arrow S direction. Therefore, if only one sheet of paper is fed from the first paper feed roller 3, the paper is directly transferred by the second paper feed roller 4 to the recording / conveying roller 6.
Sent to.

However, when two or more sheets are fed from the sheet bundle 1 due to static electricity generated by the frictional force between the sheets, only the first sheet 14 is moved by the second sheet feeding roller 4. Although it is fed downstream in the paper feed direction, that is, the recording feed roller 6,
When the paper 16 after the second paper 15 comes into contact with the paper separating roller 5, the paper separating roller 5 rotates in the direction of the arrow S, to the downstream side in the paper feeding direction of the paper 16 after the second paper 15. Is blocked. Therefore, even if two or more sheets are fed from the sheet bundle 1, only one sheet is supplied to the recording / conveying roller 6 by the second sheet feeding roller 4 and the sheet separating roller 5.

However, if the state in which the paper separating roller 5 is kept close to the second paper feed roller 4 is maintained, the first sheet of paper 14 has finished passing through the second paper feed roller 4 and at the same time.
The second paper 15 comes into contact with the second paper feed roller 4,
The first sheet of paper 14 is subsequently sent to the recording / conveying roller 6, which causes paper jam.

Therefore, the paper feeding operation is canceled from the time when the first sheet 14 reaches the recording / conveying roller 6 to the time when it has finished passing through the first paper feeding roller 3. That is, the paper detection sensor 10
When the first sheet 14 is detected, the solenoid 20 is lowered to separate the sheet bundle 1 from the first sheet feeding roller 3 and at the same time separate the sheet separating roller 5 from the second sheet feeding roller 4. .. As a result, the first sheet of paper 14 becomes the recording / conveying roller 6
Is supplied to the image recording device 7 by the second sheet of paper.
The paper 16 after 15 does not come into contact with the second paper feed roller 4 and remains on the upstream side of the paper separating roller 5 in the paper feed direction (FIG. 2).
Therefore, only one sheet of paper is supplied from the sheet bundle 1 to the image recording device 7.

At this time, the end of the first sheet of paper 14 on the downstream side in the paper feeding direction is on the downstream side of the recording and conveying roller 6 in the paper feeding direction, and the downstream side of the second sheet of paper 15 in the paper feeding direction. Of the second paper feed roller 4 and the end of the paper case 2 on the downstream side in the paper feed direction.
Between Now, the length of the paper in the paper feeding direction is L, the second
Assuming that the position L away from the paper feed roller 4 on the upstream side in the paper feed direction is A, the end on the upstream side in the paper feed direction of the second sheet 15 is located upstream from the position A in the paper feed direction. It will be. Therefore, assuming that the position of the upstream end of the first sheet of paper 14 held by the recording / conveying roller 6 is B, on the surface of the sheet bundle 1 on the side of the first paper feeding roller 3,
The second sheet of paper 15 is exposed at least between the position A and the position B (see FIG. 2). Therefore, if the felt 18 attached to the tip of the leaf spring 17 is installed between the position A and the position B, the second sheet pulled out from the uppermost part of the sheet bundle 1 is accompanied by the first sheet 14 of paper. The paper 15 is surely pressed by the felt 18.

Here, the second sheet of paper 15 is the first sheet of paper 14
F ₂ is a frictional force generated between the felt 18 and the second paper 15 that is pulled out from the uppermost part of the paper bundle 1 in association with The attraction force such as static electricity generated between the first sheet of paper 14 and the second sheet of paper 15 is F ₃
Then, if the relation of F ₂ > F ₃ is satisfied, the second sheet 15 on which the felt 18 is pressed is the first sheet 15 sent to the image recording device 7 by the recording / conveying roller 6. paper
It is separated from 14 and remains at the position upstream of the second paper feed roller 4 in the paper feed direction (see FIG. 2).

That is, the frictional force generated between the paper feed roller 3 and the first sheet of paper 14 is F ₁ , and the felt installed between the position A and the position B on the upstream side of the paper stack 1 in the paper feed direction. The frictional force generated between 18 and the second paper 15 is F ₂ , the first paper 14
Let F _{3 be} the attraction force of static electricity or the like generated between the first sheet 14 and the second sheet 15 when pulling out the sheet bundle 1 from the sheet bundle 1 and the relation of F ₁ > F ₂ > F ₃ is obtained. If the felt 18 is pressed against the sheet bundle 1 by the leaf spring 17 so that the first sheet of paper 14 is attracted to the first sheet of paper 14 due to static electricity or the like,
Since the paper 14 is not sent along with it, only the first sheet of paper 14 is sent into the image recording apparatus 7, and the double feeding of paper can be prevented.

FIG. 3 shows the configuration of the second embodiment of the present invention. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 denote the same parts, and 21 denotes paper. Case 2
The spring force F of the spring 21 pushes up the upstream portion of the paper bundle 1 loaded in the paper case 2 in the paper feeding direction by the spring as a pressing member installed in the upstream portion of the paper feeding direction. 22 is a paper case lid as a restraining member that is attached and fixed to the upper part of the paper case 2 so as to cover the upper half of the paper case 2 in the upstream direction, and 23 is attached to the lower surface of the paper case lid 22. This is a felt as a friction member, and the felt 23 is pressed against the upper surface of the paper bundle 1 pushed up by the spring 21 on the upstream side in the paper feeding direction.

Although the structure and operation of the pressing member and the friction member of this embodiment are different from the structure and operation of the pressing member and the friction member of the first embodiment, the structure and operation of the other parts of this embodiment are different. This is the same as the first embodiment.

In this embodiment having the above configuration,
Assuming that the length of the paper in the paper feed direction is L and the position separated by a distance L from the second paper feed roller 4 to the upstream side in the paper feed direction is A, the second paper 15 on the upstream side in the paper feed direction. The end is located upstream of the position A in the paper feeding direction. Therefore, when the position of the end of the first sheet of paper 14 held by the recording / conveying roller 6 on the upstream side in the paper feeding direction is B, the position of the first paper feeding roller 3 on the surface of the sheet bundle 1 is The second sheet of paper 15 will be exposed at least between position A and position B
(See Figure 4). Therefore, if the spring 21 and the felt 23 are installed so as to face each other between the position A and the position B, the first sheet of paper 14
As a result, the second sheet of paper 15 pulled out from the uppermost part of the sheet bundle 1 is reliably pressed by the felt 23.

Therefore, the paper feed roller 3 and the first paper 14
F ₁ is a frictional force generated between the first sheet of paper 14 and F ₂ is a frictional force generated between the felt 23 and the second sheet of paper 15 Eye paper 14 and second paper
Let F _{3 be} the attraction force of static electricity generated between 15 and F ₁
If the sheet bundle 1 is pressed against the felt 23 by the spring 21 so that the relation of> F ₂ > F ₃ is satisfied, even if the second sheet 15 is attracted to the first sheet 14 by static electricity or the like, Since the first sheet of paper 14 is not sent out along with the first sheet of paper 14, only the first sheet of paper 14 is sent into the image recording apparatus 7, and double feeding of paper can be prevented.

FIG. 5 shows the structure of the third embodiment of the present invention. In FIG. 5, the parts having the same reference numerals as those in FIGS. 1 and 2 are the same parts, and 24 is the paper. Paper case with opening 25 for paper feeding on the bottom plate on the downstream side in the feeding direction, 26
Is a leaf spring as a pressing member whose fixed end is attached to the upper end on the upstream side in the paper feeding direction of the paper case 24 and whose free end is projected toward the downstream side in the paper feeding direction inside the paper case 24. Has a downward spring force F in the figure. 27 is a paper case 24
With a felt as a friction member attached to the upper surface of the bottom plate on the upstream side in the paper feeding direction, the lower surface of the upstream portion of the paper bundle 1 loaded in the paper case 24 in the felt 27 is pressed by the leaf spring 26. Reference numeral 28 is a link connecting the first paper feed roller 3 and the second paper feed roller 4, and this link 28 is moved up and down in the figure by a solenoid 20.

In this embodiment, the first paper feed roller 3 and the second paper feed roller 4 are provided in the paper feed path in order to feed the paper from the paper bundle 1 from the bottom of the paper case 24. On the other hand, it is provided on the lower side, the paper separating roller 5 is provided on the upper side with respect to the paper conveying path, and the first paper feeding roller 3 and the second paper feeding roller 4 are connected by a link 28. And the like, which are different from the first and second embodiments, but their functions are the same as those of the first embodiment.
This embodiment is the same as the second embodiment.

In the present embodiment thus constructed,
Assuming that the length of the paper in the paper feed direction is L and the position separated by a distance L from the second paper feed roller 4 to the upstream side in the paper feed direction is A, the second paper 15 on the upstream side in the paper feed direction. The end is located upstream of the position A in the paper feeding direction. Therefore, when the position of the upstream end of the first sheet of paper 14 held by the carry-in roller 6 is B, the first surface of the sheet bundle 1
The second sheet 15 is exposed at least between the position A and the position B on the paper feed roller 3 side. Therefore, if the spring 26 and the felt 27 are installed so as to face each other between the position A and the position B, the sheet bundle 1 is accompanied by the first sheet of paper 14.
The second sheet of paper 15 pulled out from the top of the
Will be surely pressed.

Therefore, the paper feed roller 3 and the first sheet of paper 14
The first sheet when withdrawing F ₁ a frictional force generated between the frictional force generated between the felt 27 and the second sheet of paper 15 F _2, the first sheet of paper 14 from the paper bundle 1 Eye paper 14 and second paper
Let F _{3 be} the attraction force of static electricity generated between 15 and F ₁
If the sheet bundle 1 is pressed against the felt 27 by the spring 26 so that the relation of> F ₂ > F ₃ is satisfied, even if the second sheet 15 is attracted to the first sheet 14 by static electricity or the like, Since the first sheet of paper 14 is not sent out along with the first sheet of paper 14, only the first sheet of paper 14 is sent into the image recording apparatus 7, and double feeding of paper can be prevented.

In the image recording device 7 for printing an image on the upper surface side of the paper, when the paper is sent out from the lower side of the paper bundle as in this embodiment, the friction member rubs the printing surface of the paper. Since the printed surface of the paper is not damaged, the deterioration of the image quality of the printed image can be prevented.

FIG. 6 shows the structure of the fourth embodiment of the present invention. In FIG. 6, the parts having the same reference numerals as those in FIG. 5 show the same parts, and 29 denotes the paper case 24. The spring 29 is a pressing member attached to the lower surface of the bottom plate on the upstream side in the paper feeding direction. The spring 29 has an upward spring force F in the figure.
Reference numeral 30 denotes a felt as a friction member attached to the tip of the spring 29. The felt 30 is pressed by the spring 29 against the lower surface of the upstream side of the paper bundle 1 loaded in the paper case 24 in the paper feeding direction,
The upstream portion of the paper bundle 1 loaded in the paper case 2 in the paper feeding direction is pushed up. Reference numeral 31 is a paper case lid as a restraining member which is attached and fixed to the upper part of the paper case 24 so as to cover the upper part of the paper case 24 in the upstream half of the paper feed direction.

The constitution and operation of the pressing member and the friction member of this embodiment are different from the constitution and operation of the pressing member and the friction member of the third embodiment, but the constitution and operation of the other parts of this embodiment are different. This is the same as the third embodiment.

In the present embodiment thus constructed,
Assuming that the length of the paper in the paper feed direction is L and the position separated by a distance L from the second paper feed roller 4 to the upstream side in the paper feed direction is A, the second paper 15 on the upstream side in the paper feed direction. The end is located upstream of the position A in the paper feeding direction. Therefore, when the position of the upstream end of the first sheet of paper 14 held by the carry-in roller 6 is B, the first surface of the sheet bundle 1
The second sheet 15 is exposed at least between the position A and the position B on the paper feed roller 3 side. Therefore, if the spring 29 and the felt 30 are installed between the position A and the position B, the second paper 15 that is pulled out from the uppermost part of the paper bundle 1 along with the first paper 14 is generated. The felt 30 is surely pressed.

Therefore, the paper feed roller 3 and the first paper 14
F ₁ is the frictional force generated between the first sheet of paper 14 and F _{2 is} the frictional force generated between the felt 30 and the second sheet of paper 15 Eye paper 14 and second paper
Let F _{3 be} the attraction force of static electricity generated between 15 and F ₁
If the felt 30 is pressed against the sheet bundle 1 by the spring 29 so that the relation of> F ₂ > F ₃ is satisfied, even if the second sheet 15 is attracted to the first sheet 14 by static electricity or the like, Since the first sheet of paper 14 is not sent out along with the first sheet of paper 14, only the first sheet of paper 14 is sent into the image recording apparatus 7, and double feeding of paper can be prevented.

In the image recording device 7 for printing an image on the upper surface side of the paper, when the paper is sent out from the lower side of the paper stack as in this embodiment, the friction member rubs the printing surface of the paper. Since the printed surface of the paper is not damaged, the deterioration of the image quality of the printed image can be prevented.

By the way, the first to fourth embodiments of the present invention
In the above embodiment, an example in which rollers are used as the first paper feeding means, the second paper feeding means and the paper separating means has been described, but a belt is used instead of the first paper feeding means and the second paper feeding means. Alternatively, a blade or the like may be used as the paper separating means. Further, although the example in which the roller pair is used as the recording and conveying means has been described, a drum with a chuck or the like may be used. Further, the friction member may use cork or the like instead of the felt, the pressing member may use a solenoid or the like instead of the spring, and the restraining member is integrally formed on the upper surface of the paper case instead of the paper case lid. You may use the provided cover etc.

Further, in the embodiment of the present invention, the automatic paper feeding device for feeding the recording paper to the image recording device 7 one by one has been described, but the automatic paper feeding device for feeding the originals to the image reading device one by one. It may be.

[0044]

As described above, according to the present invention,
The first sheet fed from the sheet bundle by the first sheet feed roller
When the first sheet reaches the carry-in roller to the image recording apparatus or the image reading apparatus and the sheet feeding operation of the automatic sheet feeder is canceled, the second sheet appears on the surface of the sheet bundle. The friction member is pressed by the pressing member, or the second sheet of paper appearing on the surface of the sheet bundle is pressed by the pressing member by the friction member, and is adsorbed to the first sheet of paper by static electricity or the like. Since the second sheet is prevented from being pulled out from the sheet bundle together with the first sheet, only the first sheet is supplied to the image recording device or the image reading device. hand,
It is possible to prevent double feeding of paper to the image recording device or the image reading device.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a sheet feeding operation state according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a sheet feeding operation state according to the second embodiment of the present invention.

FIG. 5 is a configuration diagram of a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional automatic paper feeder.

FIG. 8 is an explanatory diagram of a sheet feeding operation state in a conventional automatic sheet feeder.

FIG. 9 is an explanatory diagram of a paper feed operation release state in the conventional automatic paper feeder when the paper is fed from the conventional automatic paper feeder to the image recording apparatus.

[Explanation of symbols]

1 ... paper bundle, 2 ... paper case, 3 ... first paper feed roller
(First paper feeding means), 4 ... second paper feeding roller (second paper feeding means), 5 ... paper separating means, 6 ... carry-in roller (carrying-in means), 14 ... first sheet of paper, 15 ... the second piece of paper,
17, 26 ... Leaf spring (pressing member), 18, 23, 27, 30 ... Felt (friction member), 20 ... Solenoid (paper feeding operation control means), 21, 29 ... Spring (pressing member), 22, 31 ... Paper case lid (restraint member).

Claims (2)

[Claims] 1. A first paper feed that feeds the paper from the paper bundle to a downstream side in the paper feed direction when a paper case for loading a paper bundle in which a plurality of papers are stacked and a surface of the paper bundle come into contact with each other. Means and a position downstream of the paper case in the paper feeding direction so as to come into contact with the paper in the same direction as the first paper feeding means, and the paper is fed from the first paper feeding means. And a second paper feeding unit that further feeds the first sheet of paper downstream in the paper feeding direction, and a second paper feeding unit that is arranged at a position facing the second paper feeding unit and close to the second paper feeding unit. From the paper separating means, a paper separating means for preventing the second and subsequent sheets of paper, which are sent together with the first sheet of paper with the paper conveying means, from being conveyed downstream in the paper conveying direction. It is located downstream in the paper feeding direction, and the second
Carrying-in means for holding and carrying in the first sheet of paper fed from the paper-feeding means, and after the downstream end of the first sheet of paper in the paper-feeding direction reaches the carrying-in means. Until the end of the upstream side of the first sheet of paper in the sheet feeding direction reaches the first sheet feeding means, the first sheet feeding means and the first sheet of paper are separated from each other, A paper feeding operation control unit that separates the second paper feeding unit and the paper separating unit to cancel the paper supply operation, and the paper separating unit and the second paper separating unit in the paper stack loaded in the paper case. A position upstream of the contact position with the paper after the first sheet by the length in the paper feeding direction of the paper, and an upstream side of the paper feeding direction of the first paper when the paper feeding operation is canceled. A friction member disposed so as to abut the surface of the paper bundle between the position of the edge of the Automatic feeding device, characterized in that the pressing member is provided to. 2. A first paper feed which feeds the paper from the paper bundle downstream in the paper feed direction when the paper case for loading the paper bundle in which a plurality of papers are stacked and the surface of the paper bundle come into contact with each other. Means and a position downstream of the paper case in the paper feeding direction so as to come into contact with the paper in the same direction as the first paper feeding means, and the paper is fed from the first paper feeding means. A second paper feeding means for further feeding the first sheet of paper to the downstream side in the paper feeding direction; and a second paper feeding means which is arranged at a position facing and close to the second paper feeding means. Paper feeding means for preventing the feeding of the second and subsequent sheets of paper, which is fed together with the first sheet of paper, to the downstream side in the paper feeding direction; and the paper feeding by the paper feeding means. Located downstream in the direction of the second
Carrying-in means for holding and carrying in the first sheet of paper fed from the paper-feeding means, and after the downstream end of the first sheet of paper in the paper-feeding direction reaches the carrying-in means. Until the end of the upstream side of the first sheet of paper in the sheet feeding direction reaches the first sheet feeding means, the first sheet feeding means and the first sheet of paper are separated from each other, A paper feeding operation control unit that separates the second paper feeding unit and the paper separating unit to cancel the paper supply operation, and the paper separating unit and the second paper separating unit in the paper stack loaded in the paper case. A position upstream of the contact position with the paper after the first sheet by the length in the paper feeding direction of the paper, and an upstream side of the paper feeding direction of the first paper when the paper feeding operation is canceled. A friction member disposed so as to contact the surface of the sheet bundle between the position of the edge of the sheet, and the friction member, A pressing member for said pressing to restrain the movement of the sheet bundle being pressed by a member, the automatic sheet feeding, characterized in that the restraining member for pressing the friction member to the sheet bundle is provided apparatus.