JPS6221695B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper sheet separation and conveyance device suitable for implementation in optical reading devices and similar devices.

FIG. 1 shows the configuration of a conventional sheet separation and conveyance device, in which a group of sheets 1 is placed on a mounting table 2, and a pick-up roller 3 is disposed on the upper surface of the group of sheets 1. The paper sheets taken out by the pick-up roller 3 are separated one by one by a paper sheet separation means 4. The sheet separating means 4 is composed of a separating roller 5 that rotates in the sheet feeding direction, and a reversing belt 6 that contacts the separating roller 5 and rotates in the opposite direction to the separating roller 5. The pick-up roller 3 is connected to a separation roller 5 by a belt or the like, and when the pick-up roller 3 rotates in the direction of the arrow, the roller/paper and paper/
Due to the difference in frictional force with the paper and the effect of the protruding plate 7 installed in front of the sheet group 1, the uppermost sheet or several sheets are sent out in the direction of the separation roller 5. Further, the paper sheet passing between the separation roller 5 and the reversing belt 6 is always separated into one sheet. The pick-up roller 3, separation roller 5 and reversing belt 6 constitute a paper sheet separation and conveyance device, and one sheet separated by this paper sheet separation and conveyance device is transferred between an upper guide 8 and a lower guide 9. The paper is transported to the next process by the transport rollers 10 through the intermediate steps.

The leading edge of one separated sheet of paper is conveyed by the transport roller 10
When passing the sensor 11 located immediately behind the pickup roller 3, the separation roller 5 and the reversing belt 6 are stopped.

A one-way clutch is built into the pick-up roller 3 and the separation roller 5, and in order to rotate freely in the direction in which the paper travels, the transport roller 10
It rotates as the paper travels due to the conveying force of the paper, and stops when the trailing edge of the paper passes.

Therefore, there is no problem when the size of the paper sheet is longer than the distance between the pick-up roller 3 and the transport roller 10, but when separating and transporting shorter paper sheets, the following problems occur. .

In order to increase the separation capacity, it is necessary to increase the contact length between the separation roller 5 and the reversing belt 6.
Further, in order to provide a margin for the machining accuracy and wear of the separation roller 5, the reversing belt 6 is generally made of a soft material such as foamed urethane, and the conveying force of the separation roller 5 is poor. Therefore, if a sheet is conveyed that is shorter than the distance between the pick-up roller 3 and the conveyance roller 10, when the conveyance force of the pick-up roller 3 is lost, it will slip between it and the separation roller 5, which will only slow down the conveyance speed. Instead, information such as characters written on the surface of the paper sheet is erased, and the abrasion powder of the separation roller 5 stains the surface of the paper sheet. Furthermore, as shown in FIG. 3, the pick-up roller 3 continues to rotate even after sending out the first sheet, so the next sheet is also sent out, causing it to slip between it and the separating roller 5, and then stop. The paper may collide with the paper sheet being held and cause a jam, or it may get stuck between the paper sheet and the separation roller 5 and be conveyed, causing multiple conveyances and significantly reducing the reliability of the function. One possible measure to prevent the above phenomenon is to shorten the distance between the rollers, but this method has a paper sheet length of around 70 mm, which makes it difficult to increase the speed.

The present invention has been made based on the above-mentioned problem, and even when a sheet of paper having a dimension shorter than the distance between the pick-up roller and the conveyance roller is conveyed, there is no slippage between the separation roller and the sheet surface. It is an object of the present invention to provide a highly reliable paper sheet separation and conveyance device that does not contaminate paper sheets, cause jams, or cause multiple conveyances.

The features of the present invention include a pick-up roller that picks up paper sheets from a group of paper sheets on a mounting table, and a pick-up roller that picks up paper sheets from a group of paper sheets on a mounting table.
In a paper sheet separating and conveying device comprising a sheet separating means for separating sheets one by one, a position near the side of the sheet separating means and downstream in the sheet conveying direction from a point where separation resistance force is applied in the sheet separating means. The pick-up roller includes an auxiliary conveyance means disposed on the side, and a detection means for detecting that a sheet separated into one sheet is conveyed to the auxiliary conveyance means, When it is detected that a sheet has been conveyed to the means, the apparatus stops, and the auxiliary conveying means is controlled to be driven in synchronization with the sheet separating means.

Hereinafter, one embodiment of the paper sheet separation and conveyance device of the present invention will be described with reference to FIG.

In FIG. 3, the same numbers as in FIG. 1 indicate the same parts. Near the side of the paper separation means 4 consisting of the separation roller 5 and the reversing belt 6, and on the downstream side in the paper transport direction of the separation resistance force applying point of the paper separation means 4, there is provided an auxiliary transport means. A pair of auxiliary conveyance rollers 12a and 12b are provided.
The auxiliary conveyance rollers 12a and 12b are driven and controlled in the same operating mode as the separation roller 5 described above. Further, although not shown in the drawings, this apparatus is provided with a detection means for detecting that a sheet separated into one sheet by the sheet separation means 4 is conveyed between the auxiliary conveyance rollers 12a and 12b. There is. The pick-up roller 3 is arranged so as to come into contact with the uppermost sheet of the sheet group 1 placed on the mounting table 2, and when the pick-up roller 3 rotates in the feeding direction, the uppermost sheet is The paper sheets on the side are fed between the separation roller 5 of the paper separation means 4 and the reversing belt 6. And this pick-up roller 3 is,
Its operation mode is separate from the operation mode of the separation roller 5 described above, and the drive is stopped by a detection signal from the detection means described above. The auxiliary conveyance rollers 12a and 12b are also equipped with one-way clutches, similar to the pick-up roller 3 and separation roller 5. Further, the contact point between the pair of auxiliary conveyance rollers 12a and 12b is installed at the same height as the contact point between the separation roller 5 and the reversing belt 6 in order to prevent the sheet from being damaged by excessive deformation. .

Further, although a pair of auxiliary conveyance rollers 12a and 12b may be used as described above, since rotational force is applied to the paper sheet, the amount of skew increases. Therefore, in order to maintain a good skew amount, it is preferable to provide them on both sides of the separation roller 5.

When the pick-up roller 3 that is in contact with the top of the sheet group 1 placed on the mounting table 2 rotates, the sheet group 1 moves in the conveying direction, but it hits the protruding plate 7 installed in front. , only one or several sheets are transported.

When many sheets of paper are conveyed, they are stopped by the frictional force between the separation roller 5, the reversing belt 6, and the paper, and only the topmost sheet is picked up by the frictional force between the separation roller 3 and the separation roller 5. transported by.

The leading edge of the separated paper sheet is bitten by the auxiliary conveyance rollers 12a, 12b, which are provided on the downstream side in the sheet conveyance direction from the separation resistance force applying point of the sheet separation means, and the auxiliary conveyance rollers 12a, 12b It is transported to the next process with the transport force of .

The pick-up roller 3 stops after the leading edge of the separated sheet is bitten by the auxiliary transport rollers 12a, 12b.

For this reason, unlike conventional devices, even if a short sheet of paper is sent, the next sheet of paper is not sent.

The separated sheet of paper is conveyed without slipping by the friction between the separation roller 5 and the pair of auxiliary conveyance rollers 12a and 12b, and the tip of the sheet is conveyed by the conveyance roller 1.
It stops after being bitten by 0.

FIG. 4 shows another embodiment of the present invention, in which a separation roller 5 and an auxiliary conveyance roller 12a are integrally formed, and an auxiliary conveyance roller 12b is placed in opposition to this auxiliary conveyance roller 12a. By doing so, the axes of the separation roller 5 and the auxiliary conveyance roller 12a can be made to be the same axis.

According to the present invention, an auxiliary conveyance body that applies a conveying force to the paper sheets caught in the paper sheet separation means and a paper sheet separation means are disposed near the auxiliary conveyance body, and the separated paper sheets are transferred to the auxiliary conveyance body. When it is detected that the pick-up roller has been transported, the drive of the pick-up roller is stopped, and the drive of the auxiliary transport body is synchronized with the drive of the separation transport body, so the distance between the pick-up roller and the transport roller is shorter than the For example, even for paper sheets of about 50 mm, there will be no slippage between the separation roller and the paper sheet surface, no staining of the sheet surface, and no jamming or multiple conveyance. Therefore, it is possible to provide a paper sheet separation and conveyance device with high performance.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a conventional sheet separation and conveyance device, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a side view of Fig. 1.
FIG. 4 is a partially cutaway perspective view of an embodiment of the sheet separation and conveyance device of the present invention, and FIG. 4 is a perspective view of another embodiment of the essential parts of the sheet separation and conveyance device of the present invention. be. 1... Paper leaf group, 3... Pick-up roller, 4
... Paper sheet separation means, 5 ... Separation roller, 6 ... Reversing belt, 10 ... Conveyance roller, 12a, 12b
...Auxiliary conveyance roller.

Claims (1)

[Scope of Claims] 1. A pick-up roller 3 for taking out a sheet from the top of a group of sheets 1 on a mounting table 2, and a sheet separating means 4 for separating the sheets taken out by the pick-up roller 3 into individual sheets. In the paper sheet separation and conveyance device, the auxiliary conveyance is arranged in the vicinity of the side of the sheet separation means 4 and downstream of the separation resistance force application point in the sheet separation means 4 in the sheet conveyance direction. Means 1
2a, 12b, and the separated paper sheets are transferred to the auxiliary conveyance means 12.
a, 12b; the pick-up roller 3 stops when the detection means detects that the sheet is conveyed to the auxiliary conveyance means 12a, 12b; A sheet separating and conveying device characterized in that the means 12a and 12b are driven and controlled in synchronization with the sheet separating means 4. 2. The paper sheet separation means 4 contacts a separation roller 5 that rotates in the transport direction of paper sheets, and this separation roller 5,
It is composed of a reversing belt 6 that rotates in the opposite direction to the separating roller 5, and the auxiliary conveying means 12a, 12b is composed of a pair of auxiliary conveying rollers 12a, 12b arranged near one side of the sheet separating means 4. A sheet separating and conveying device according to claim 1, characterized in that: 3. The sheet separation means 4 contacts a separation roller 5 rotating in the direction of sheet conveyance, and this separation roller 5,
A reversing belt 6 that rotates in the opposite direction to the separation roller 5 is constructed, and the auxiliary conveyance means 12a, 12b are constituted by a pair of auxiliary conveyance rollers 12a, 12b disposed near both sides of the sheet separation means 4. A sheet separating and conveying device according to claim 1, characterized in that: