JPH06321409A - Document feeder - Google Patents

Abstract

PURPOSE:To provide a document feeder which can discharge a document smoothly regardless of the size of the document, and stock it in order completely. CONSTITUTION:A document feeder separates documents 6 which are stacked on a document table 7 by a separation mechanism 8, a piece of separated documents is loop-inverted and carried to a prescribed image reading position by a conveyance mechanism 10 to read the image, thereafter the document 6 is carried further while it is loop-inverted, and discharged to a document stock part 12 located below the document table 7 by a discharge mechanism 11. A rotation fulcrum 24 is formed in the central part of the document table 7, and the upstream side from the document table 7 which is rotated to the side of the document stock part 12 by the rotation fulcrum 24 is formed as a small size document stock part 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop reversing type document feeding device mounted on a facsimile, a scanner or the like.

[0002]

2. Description of the Related Art FIG. 5 shows a configuration example of a conventional loop reversal type document feeder. Manuscript table 1
The originals 2 placed on the top of the original 2 are sequentially separated, conveyed,
As it is ejected, it is ejected by the ejection roller 3 and is stacked on the document stock section 4 located below the document table 1. In this case, when the original 2 is of a small size, it is brought to the back like the original 2a by the momentum of its ejection. When the next original 2b is discharged while the original 2a is discharged, the original 2b also slips under the original 2a, and the discharged original 2 (original 2a, 2b).
The result is that the order of is out of order.

Therefore, in order to eliminate such a problem,
As shown in FIG. 6, when the original 2 has a small size, a method of sticking an original stop plate 5 (made of polyester film 100) on the lower surface side of the original table 1 is often adopted. As a result, the small-sized original 2 ejected vigorously from the ejection roller 3 is stocked on the front side as compared with the case of FIG. 5 in which the original stop plate 5 is not provided, and in this state, it is ejected next. The original 2d to be stored is surely stocked on the original 2c discharged before. In this manner, the document stop plate 5 is used to prevent the document 2 from being discharged out of order.

[0004]

In the case of FIG. 6, when the document stopping plate 5 made of the polyester film 100 has too strong a deterrent force, it is good for the small size document 2 but for the large size document 2. As shown in FIG. 7, the document stop plate 5
The document 2 stops at this position, which may cause the document 2 to bend and cause stock defects. On the other hand, if the original holding plate 5 has a weak holding force, the small-sized original 2 penetrates through the original holding plate 5, and as a result, as shown in FIG.
The same phenomenon as above occurs and the order of the manuscript 2 is changed. Therefore, from this point of view, the setting area of the force to be suppressed by the document stop plate 5 should be set in consideration of the size of the document 2.
However, it is extremely difficult to use such a stock control method.

In addition to the stock control using the document stopper plate 5 as described above, there is a method of controlling the paper discharge speed of the paper discharge roller 3 to perform the stock control. A motor control circuit, a document detection sensor, etc. are required, resulting in a significant cost increase.

[0006]

According to the first aspect of the present invention, after the originals stacked on the original table are separated by the separating mechanism, the separated one original is loop-inverted by the conveying mechanism to be predetermined. In the document feeding device, the document table is conveyed to the image reading position, the image is read, the document is further conveyed while being loop-inverted, and the document is ejected to the document stock section located under the document table by the ejection mechanism. A rotation fulcrum is provided at the center of the document table, and the upstream side of the document table rotated to the document stock section side by this rotation fulcrum is formed as a small size document stock section.

[0007]

According to the first aspect of the present invention, the upstream side of the document table rotated by the rotation fulcrum is used as the small-size document stock portion, so that the small-sized document stock portion is provided on the upstream side. It is possible to surely stock the sheets in order, and it is possible to surely stock the sheets on the upstream side and the downstream side even when a large-sized document is discharged.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. First, the overall configuration of the document feeder will be described with reference to FIG. This apparatus includes an original table 7 on which originals 6 are stacked, a separating mechanism 8 for sending out the originals 6 stacked on the original table 7 one by one, and a contact glass surface on which the separated originals 6 are set as an image reading position. 9 is roughly divided into a transport mechanism 10 for transporting the document 9, a discharge mechanism 11 for discharging the transported and read document 6, and a document stock section 12 located below the document table 7.

The separating mechanism 8 includes a pickup roller 1
3, a pickup lever 14, a separation belt 15,
It comprises a spring 16 for applying pressure to the separation belt 15, a feed roller 17, and a driven roller 18 that abuts on the feed roller 17. Further, the transport mechanism 10 is configured as a transport unit including a transport belt 19, a drive roller 20, and a transport roller 21. Further, the discharge mechanism 11 includes a paper discharge roller 22 and a driven roller 23.

A rotation fulcrum 24 is provided near the center of the original table 7. The rotation table 24 branches the document table 7 into a downstream side and an upstream side, and the upstream side is formed as a small size document stock portion 25. The downstream side of the original table 7 branched by this is the original placing portion 26 of the original 6.

FIG. 2 is an enlarged view of the area between the document placing portion 26 and the small size document stock portion 25 which are branched by the rotation fulcrum 24 of the document table 7. FIG. 3 is a sectional view taken along the line aa of FIG. In this case, in FIG. 3, the convex portion 27a of the document placing portion 26 is fitted into the concave portion 27b of the small-sized document stock portion 25, and the rotation fulcrum 24 is formed.
Are formed. As a result, the small-sized original stock portion 25 on the upstream side can rotate about the rotation fulcrum 24. Further, in FIG. 2, the convex portion 28a formed on the small-sized document stock portion 25 is fitted with the concave portion 28b formed on the document placing portion 26 to maintain a flat plane, and the convex portion 28a. By fitting with the recess 28c located above the recess 28b, an inclined surface as shown by the broken line in FIG. 1 can be formed.

A case will now be described in which a small-sized original 6 is fed in such a configuration. Normally,
Small size original stock section 25 on the upstream side of the original table 7
Has a convex portion 28a on the upstream side thereof fitted with a concave portion 28b on the downstream side, and is in a flat state shown by a solid line in FIG.
When feeding a small-sized original document 6, the small-sized original document stock portion 25 at the upstream portion is rotated so that the convex portion 28a becomes the concave portion 2.
8c, and is fixed to the position of the inclined surface shown by the broken line in FIG. As a result, the small-sized document 6 is conveyed by the conveyance mechanism 10 through the separation mechanism 8, is ejected by the ejection roller 22 of the ejection mechanism 11, and is stocked in the small-sized document stock portion 25 having an inclined surface. Then, manuscript 6
Are sequentially stocked on it.

Therefore, since the small-size original stock portion 25 is provided on the upstream side of the original table 7 rotated by the rotary fulcrum 24, the small-size original document 6 is surely placed in the upstream small-sized original stock portion 25. Can be stocked in order. Further, even when a large-sized document 6 is discharged, the inclined surface of the document table 7 can be used to surely stock the upstream side and the downstream side.

[0014]

According to the first aspect of the present invention, after the originals stacked on the original table are separated by the separating mechanism, the separated single original is loop-inverted by the conveying mechanism to perform a predetermined image reading position. In the original feeding device that conveys the original to the original stock section located under the original table by the ejecting mechanism after the original is read and the image is read, the original is fed to the central portion of the original table. Since a rotation fulcrum is provided, and the upstream side of the document table rotated to the document stock section side by this rotation fulcrum is formed as a small-size document stock section, a small-size document is stocked on the upstream side of the small-size document stock. The sheets can be reliably stocked in order, and even when a large-sized document is discharged, it is reliably stocked across the upstream side and the downstream side. It is those that can be.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a document feeding device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a region of a rotation fulcrum of a document table.

FIG. 3 is a sectional view taken along line aa of FIG.

FIG. 4 is a cross-sectional view showing a set state of a document table when a small-sized document is conveyed.

FIG. 5 is a side view showing a configuration example of a conventional document feeding apparatus.

FIG. 6 is a side view showing a configuration example of a document feeding device provided with a document stopper plate 5.

FIG. 7 is a side view showing a state in which a large-sized document is inserted and a paper jam occurs.

[Explanation of symbols]

 6 Originals 7 Originals Table 8 Separation Mechanism 10 Conveying Mechanism 11 Ejection Mechanism 12 Originals Stock Section 24 Rotation Support 25 Small Size Original Stock Section

Claims (1)

[Claims] 1. After separating an original document stacked on an original table by a separation mechanism, the separated original document is loop-inverted by a conveyance mechanism and conveyed to a predetermined image reading position to read an image. Further, in a document feeding device that conveys the document while loop reversing and discharges it to a document stock section located under the document table by a discharge mechanism, a rotation fulcrum is provided at the center of the document table. An original feeding device, characterized in that the upstream side of the original table rotated to the original stock section side by a fulcrum is formed as a small size original stock section.