JPS6128568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device, and particularly to a paper feeding device suitable for feeding documents to a facsimile machine.

Various models are known for the automatic document feeder that feeds originals into facsimile machines, but each type depends on the type of original (size, weight, etc.).
Misfeeding occurs to a greater or lesser extent due to paper thickness), shape (curls, folds, tears), changes in atmosphere, and deterioration of paper feed rollers.

Generally, paper feeding mistakes are allowed to a degree that is satisfactory for use, but there are some documents in which paper feeding mistakes are not allowed. For example, when sending a set of originals with many sheets, if even one sheet is misfeeded, the original will be useless. In addition, some documents are made of paper that is easily damaged if a feeding error occurs.

Conventionally, in the case of originals where feeding errors should not be avoided, an operator would accompany the paper feeding device and monitor the device. There remained problems that could not be resolved.

The present invention has been made in view of the above, and by feeding originals for which feeding errors are tolerated and documents for which feeding errors are not tolerated in different paper feeding modes, it is possible to feed originals for which feeding errors are not tolerated. An object of the present invention is to provide a paper feeding device that can reliably feed paper.

The object of the present invention is to provide a paper feeding device including a document mounting table for stacking originals and a paper feeding means for feeding out the documents on the document mounting table, in which a plurality of documents are swingably supported on a support. A document holder including a clamping plate and sandwiching a sheet of document between adjacent clamping plates; and at least a pair of holder positioning parts provided on both sides of the document mounting table so as to allow the document holder to be attached and detached. There is a first feeding mode in which originals stacked on the document mounting table are sent out, and a second feeding mode in which the document holder is positioned and placed on the original mounting table and the originals held between the original holders are sent out. This is achieved by a paper feeding device that is characterized in that it can selectively take a paper mode.

According to the present invention, for originals for which it is not desirable to allow paper feeding errors or for originals that are likely to cause paper feeding errors, so-called specific originals are placed one by one in advance between adjacent clamping plates of the original holder. The originals are separated and clamped, and the originals are fed after positioning the document holder on the document table. For documents that can tolerate feeding errors, they are stacked directly on the document table and fed.
It is possible to reliably feed a specific original.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In FIGS. 1 and 2, reference numeral 1 indicates a document mounting table, and side plates 2 and 3 are provided on both sides thereof. A tip end 1a of the document placement table 1 stands up with an inclination in the document feeding direction indicated by an arrow a, and is connected to a lower guide plate 5 forming a document path 4. An upper guide plate 6 is arranged above the guide plate 5.

An auxiliary separation roller 7 and a separation roller 8 have a portion of their respective peripheral surfaces protruding into the document path 4 . The auxiliary separation roller 7 is rotated by a drive device (not shown) in a direction opposite to the document conveyance direction via a clutch mechanism 7a. Further, the separation roller 8 is rotated in the same direction as the auxiliary separation roller 7 by a drive device (not shown).

A feed roller 9 is arranged above the separation roller 8 and rotates in the document conveyance direction. The feed roller 9 and the separation roller 8 may be arranged so as to rotate while sliding against each other, or each roller may be a chopped roller,
They may be arranged in such a manner that their circumferential surfaces are inserted into each other in the axial direction.

The feed roller 9 is fixed to a support shaft 10 rotatably supported between the side plates 2 and 3, and is driven by a drive device (not shown). Further, the friction coefficient of the feed roller 9 with respect to a typical document is set to be larger than that of the separation roller 8.

A pair of arms 11 (only one of which is shown) is pivotally attached to the support shaft 10 . A paper feeding roller 13, which forms part of a paper feeding means, is rotatably supported by a shaft 12 at the free end 11a of the arm 11.
As shown in FIG. 2, a pulley 20 is fixed to the shaft 12. On the other hand, a pulley 15 is attached to the support shaft 10 via a clutch 14 (see FIG. 1). In addition, the arm 11
Guide pulleys 16, 17, 18 are installed at the bent portions of
are each rotatably provided.

And the above pulleys 20, 17, 18, 1
A timing belt 19 is wound around the shafts 5 and 16, and the rotation of the spindle 10 is controlled by the clutch 14.
It is configured to selectively transmit the information to the paper feed roller 12 via. The paper feeding means is a paper feeding roller 13.
It consists of a pulley and a belt that drive this.

The distal end portion 11b at the base end of the arm 11 is cut into a chevron shape, and a roller 22 provided at the free end of the stop lever 21 is located in the swinging locus of this tip portion 11b. The stop lever 21 is pivotally connected by a support shaft 21a fixed to the side plate 2, and a spring 23 moves the roller 22 to the distal end 11 of the arm.
It is given a rocking habit in the direction of contacting b.

The stop lever 21 moves the arm 11, which swings between a non-sheet feeding position shown in FIG. 1 and a sheet feeding position shown in FIG. It is to be held temporarily.

At the exit 4a of the document path 4, a document detection means 24 consisting of a light emitting element and a light receiving element is disposed facing each other. When this detection means 24 detects the leading edge of the document, it disconnects clutches that control the rotations of the auxiliary separation roller 7 and the paper feed roller 13, respectively.
When the trailing edge of the document is detected, a signal is generated that connects the clutch.

As shown in FIG.
In addition to being able to stack the documents S, it is also possible to place a document holder 25 thereon as shown in FIG.

As clearly shown in FIG. 3, the document holder 25 has both ends 26a, 26b connected to the side plates 2,
3, a plurality of clamping plates 27, and a pair of supporting shafts 28, which are substantially integral with the support shaft 26 and which swingably hold the clamping plates 27. There is. In the illustrated embodiment,
A support body that supports the clamping plate 27 is composed of a support shaft 26 and a support ring 28.

The plurality of clamping plates 27 have different lengths so that when they are overlapped as shown in FIG. 3, their free side edges 27a are uneven. Furthermore, an opening 27b is formed in the free side edge of the clamping plate 27, into which the paper feed roller 13 enters when the document holder 25 is placed on the document table 1. Further, the plurality of clamping plates 27 are used to clamp a specific document one sheet at a time between adjacent clamping plates, but in order to prevent the document from coming into close contact with the clamping plates, the illustrated embodiment is In this case, each clamping plate is provided with a large number of holes 27c. Note that instead of the holes 27c, by forming unevenness on the surface of the clamping plate or by forming the clamping plate in a corrugated shape, an air layer is created between the clamping plate and the document to ensure close contact between the two. You may try to prevent it. Furthermore, paper or plastic film is suitable as the material for the holding plate.

On the other hand, the side plates 2 and 3 are provided with the document holder 25.
A pair of holder positioning portions 29 and 30 are formed, respectively, into which both ends 26a and 26b of the support shaft 26 are fitted. As shown in FIG. 2, the positioning section 29 positions the document holder 25 holding a specific A4 size document, for example. ) to position the document holder that will hold the document. That is, document holders are prepared in correspondence with the size of the document to be held, such as one for A4 size and one for A5 size. When the document holder of any size is engaged with the positioning portion 29 or 30, the shortest clamping plate 27, and the lowest position in the case of the A4 size holder shown in FIG. The length of the clamping plate 27 (in the document feeding direction) is determined such that the leading edge of the clamping plate is located on the advancing side of the paper feed roller 13 in the feeding direction. This is because the larger the area of the portion of the document held by the holding plate 27 is, the smaller the area in which the documents come into close contact with each other, and thus the separation property is improved.

The document mounting table 1 has a hole 1b into which a support ring 28 is inserted when the document holder 25 is placed thereon.

As shown in FIG.
A first paper feeding mode in which documents S ₁ are placed in a stack, and a second paper feeding mode in which the document holder 25 holding a specific document S ₂ is placed on the document table 1 as shown in FIG. You can choose. The effects of each mode will be explained below.

First paper feeding mode As shown in FIG. 1, the arm 11 is swung to the solid line position and the paper feeding roller 13 is raised to the non-paper feeding position. The position of the arm 11 is maintained at the tip portion 11b by positioning rollers 22. The originals _S1 are stacked and placed on the original placing table 1, which is opened by raising the paper feed roller. In this case, the document _S1 can tolerate some paper feeding errors.

Next, the arm 11 is swung, and the paper feed roller 1 is
3 is brought into contact with the uppermost document as shown by the chain line 13A.

After that, press the paper feed button (not shown), the paper feed roller 13, the auxiliary separation roller 7, and the separation roller 8.
and the feed roller 9 rotate in the directions indicated by the arrows. Then, the stacked documents S ₁ are transferred to the paper feed roller 1
3A, a plurality of sheets including the top original are sent in the direction of arrow a. These originals advance along the leading edge 1a of the original document mounting table, and their leading edges are shifted from each other so that the higher-ranking original takes the lead. When the document to be fed comes into contact with the auxiliary separation roller 7, which is rotating in the opposite direction to the conveyance direction, the topmost document receives the feeding force of the paper feed roller and continues to advance. The contacting lower document is stopped at this position by the friction of the roller 7.
At this time, the documents that have not been separated are separated by the next separation roller 8, and only the uppermost document _S1 advances through the document path 4 by the action of the feed roller 9.

When the leading edge of the advancing document is detected by the detection means 24, a control circuit (not shown) is actuated in response to this detection signal, disconnecting the clutch 14 and the clutch 7a, and disconnecting the paper feed roller 13 and the auxiliary separation roller. Cut off the driving force transmission to 7. Therefore, the paper feed roller 13 is
It is rotated along with the document conveyed by the feed roller 9.

When the detection means 24 detects the rear end of the document, the clutches 14, 7a, which have been disconnected until now, are released.
are connected again, the paper feed roller 13 and the auxiliary separation roller 7 are rotated, the roller 13 and the auxiliary separation roller 7 are rotated, and the next document is sent out by the roller 13.

Thereafter, by repeating the above-described operation, the originals _S1 on the original placing table 1 are sequentially fed. Note that the document sent out by the paper feeding device is guided to, for example, a reading section (not shown) of a facsimile device. When the last original on document tray 1 is fed,
After the detection means detects the rear end of this, the device automatically stops after a certain period of time has elapsed.

2nd Paper Feeding Mode Originals that do not want to allow paper feeding mistakes or originals that are likely to cause paper feeding errors, so-called specific originals _S2 , are held one by one between adjacent holding plates 27 of the original holder 25. and set the paper feed roller 13 to the non-feed position (first
(see the solid line in the figure), and then the document holder is placed on the opened document table 1. At this time,
The document holder 25 is positioned and placed by engaging both ends of the support shaft 26 with the holder positioning portion 29 . For the illustrated manuscript S ₂ , e.g.
In the case of a specific A5 size document, the support shaft of an A5 size holder (not shown) is fitted into the positioning section 30 to position and place the document.

Then, as shown in FIG. 2, the arm 11 is swung to bring the paper feed roller 13 into contact with the uppermost document S ₂ through the opening 27b of the holding plate 27, and then the paper feed button (not shown) is pressed. When pressed, each roller rotates in the same way as in the first paper feeding mode. Since the originals S ₂ sent out by the paper feed roller 13 are held between adjacent holding plates 27, adjoining originals are prevented from coming into close contact with each other. The documents are sent one by one to the document path 4.

In addition, the original held by the clamping plate is prevented from coming into close contact with the clamping plate 27 by the inflow of air from the hole 27c formed in the clamping plate, so the load caused by being clamped is not a problem. The paper is fed without any interruption.

Document S ₂ sent out by paper feed roller 13
Since they are separated in advance by the clamping plate 27, double feed does not occur. However, if this occurs, the separation occurs due to the action of the auxiliary separation roller 7 and the separation roller 8.

In FIG. 2, the thickness of the clamping plate 27, the interval at which the originals are clamped, and the interval between the originals are exaggerated for the sake of illustration.

The actions of each roller after the sent document S ₂ is detected by the detection means 24 are the same as in the first paper feeding mode described above, so a description thereof will be omitted to avoid duplication.

As described above, the paper feeding device of the present invention can selectively take the first paper feeding mode and the second paper feeding mode. In other words, it is possible to feed paper without causing a paper feeding error.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a side sectional view showing the second paper feeding mode, and FIG. 3 is a perspective view showing an example of the document holder. DESCRIPTION OF SYMBOLS 1... Original mounting table, 13... Paper feeding means (paper feeding roller), 25... Original holder, 26, 28... Support body, 27... Holding plate, 27a... Free side edge, 27b...
Opening portion, 27c... Hole for preventing adhesion, 29, 30...
Holder positioning section, S ₁ ...original, S ₂ ...specific original.

Claims (1)

[Scope of Claims] 1. In a paper feeding device including a document placing table 1 on which originals are stacked and a sheet feeding means 13 for feeding out the originals on the document placing table 1, the supports 26 and 28 are provided with a swinging mechanism. A document holder 25 includes a plurality of holding plates 27 that freely support a plurality of documents, and holds a single document _S2 between adjacent holding plates 27; At least a pair of holder positioning parts 2 that removably support the holder 25
9 and 30, and a first paper feeding mode in which the originals S1 stacked on the original placing table ₁ are sent out, and a first feeding mode in which the original document holder 25 is positioned and placed on the original placing table 1, and Manuscript S ₂ held between 25
A paper feeding device characterized in that it can selectively take a second paper feeding mode in which the paper is fed. 2 Free side edge 2 of clamping plate 27 of document holder 25
2. A paper feeding device according to claim 1, wherein an opening 27b is provided in 7a into which the roller 13 of the paper feeding means enters. 3. Claim 1, characterized in that the lengths of the respective clamping plates 27 are made different so that when the plurality of clamping plates 27 are overlapped, the free side edges 27a of the respective clamping plates 27 are uneven. Paper feed device as described. 4. The paper feeding device according to claim 1, characterized in that a hole 27c or unevenness is formed to prevent the clamping plate 27 of the document holder 25 from coming into close contact with each other.