JP4579221B2 - Paper sheet conveying apparatus and paper sheet conveying method - Google Patents

Description

  The present invention relates to an apparatus for handling paper sheets such as banknotes, and more particularly, to a paper sheet transport apparatus and a paper sheet transport method for separating and transporting stacked paper sheets one by one.

  In general, a paper sheet conveying apparatus that separates and conveys stacked paper sheets one by one is generally provided with a feeding roller that rotates in the direction in which the paper sheet is conveyed, and a separation roller that is disposed at a position facing the feeding roller. And a feeding roller that feeds the uppermost paper sheet so as to be separated from the accumulated paper sheet and inserts it between the feeding roller and the separation roller. Such paper sheet conveying apparatuses are roughly classified into a pressure contact method and an overlap method. In the pressure contact method, the outer peripheral surface of the sending roller and the outer peripheral surface of the separation roller are arranged close to each other, and the paper sheets are pressed and sent out by the sending roller and the separation roller. On the other hand, in the overlap method, the outer peripheral surface of the sending roller and the outer peripheral surface of the separation roller are arranged in a nested manner, and the paper sheet is sent out while being slightly deformed into a wave shape by the sending roller and the separation roller. Yes.

  For example, when the first paper sheet is fed out by the feeding roller, the second paper sheet may be taken out simultaneously for some reason, but the leading ends of the first and second paper sheets When the sheet is fed out in a state where the positions are aligned (or when the leading edge of the first sheet is fed before the leading edge of the second sheet), the frictional force of the feeding roller > Because of the frictional force of the separation roller, only the first sheet on the delivery roller side is inserted between the delivery roller and the separation roller. However, when the leading edge of the second sheet is advanced beyond the leading edge of the first sheet, for example, because the lengths of the accumulated sheets are different, for example, There arises a problem of double feeding in which the two sheets are simultaneously inserted between the feeding roller and the separating roller and fed out.

  Therefore, in order to cope with this, for example, in an overlap type paper sheet conveying apparatus, the paper sheet is fed out so as to be separated from the accumulated paper sheet, and the leading end of the paper sheet is fed as a feed roller (feed roller). An impeller that abuts against the low friction surface and the peripheral surfaces of the stopper rollers on both sides, and a kicker roller that further feeds out the paper fed out by the impeller and inserts it between the feed roller and the separation roller (reverse roller). Has been proposed (for example, see Patent Document 1). The impeller is configured to have a plurality of blades rich in flexibility, so that paper sheets are fed out with a weak force. By feeding out with this impeller, the leading edge of the paper sheet is aligned at a predetermined position (specifically, a position where it abuts against a low friction surface of the delivery roller), so that double feeding is prevented.

JP 2002-347961 A

However, the above prior art has room for improvement as follows.
That is, in the above-described prior art, although the feeding force by the impeller is weak, the leading edge positions of the paper sheets are aligned by abutting the paper sheets against the low friction surface of the feed roller. For this reason, paper sheets with extremely low rigidity are buckled, and there is a possibility that they will be damaged by any chance.

  An object of the present invention is to provide a paper sheet conveying apparatus and a paper sheet conveying method capable of preventing the buckling of paper sheets and aligning the leading end thereof to a predetermined position and preventing double feeding. It is in.

  (1) In order to achieve the above object, the present invention provides a paper sheet conveying apparatus that separates and conveys stacked paper sheets one by one, and is a delivery roller that rotates in the paper sheet conveying direction. A separation roller provided at a position opposite to the feeding roller and rotating in a direction opposite to the conveying direction of the paper sheet, and the paper sheet is fed out so as to be separated from the accumulated paper sheet, In order to return the first feeding means inserted between the roller and the separation roller and the leading edge of the paper sheet inserted between the feed roller and the separation roller to a predetermined position, the outer peripheral surface of the separation roller Roller proximity means movable so as to be close to each other, and second feeding means for feeding the paper sheets returned to the predetermined position and reinserting them between the feed roller and the separation roller.

  In the present invention, the first feeding means feeds the paper sheet and inserts it between the feed roller and the separation roller. Thereafter, when the roller proximity means approaches the separation roller, the separation roller returns the paper sheet, and the leading edge of the paper sheet is moved to a predetermined position (specifically, the upstream position where the pressure contact between the separation roller and the roller proximity means does not reach). ). Then, the returned paper sheets are reinserted between the sending roller and the separation roller by the second feeding means, and the sending roller feeds the paper sheets.

  As described above, in the present invention, after the paper sheet is once inserted between the feeding roller and the separation roller, the separation roller returns the paper sheet when the roller proximity means approaches the separation roller, and the paper sheet Can be aligned at a predetermined position. That is, for example, when the first sheet is fed out by the first feeding unit, the second sheet is taken out, and the leading edge of the second sheet is the leading edge of the first sheet. When the paper is fed out further, two sheets of paper are inserted between the feeding roller and the separation roller at the same time. However, it is possible to return the two sheets and align the leading end position. it can. As a result, the number of paper sheets to be inserted between the feeding roller and the separation roller by the second feeding means is reduced to one sheet, and double feeding can be prevented. Also, unlike the prior art described in Patent Document 1, for example, the leading edge of the paper sheet is not aligned by abutting against a roller or the like, so that buckling of the paper sheet can be avoided. Therefore, in the present invention, the leading end position can be aligned while avoiding buckling of the paper sheets, and double feeding can be prevented.

  (2) In the above (1), preferably, the feeding roller is provided with a feeding portion having high friction on a part of an outer peripheral surface thereof, and the feeding of the paper sheets by the feeding portion of the feeding roller and the first The feeding of the paper sheets by the two feeding means is synchronized.

  (3) In the above (1), preferably, the roller proximity means is an eccentric roller provided eccentrically with respect to a rotation shaft of the delivery roller, and after the paper sheet is fed by the first feeding means and the first Before the paper sheet is fed by the two feeding means, the outer circumferential surface of the eccentric roller comes close to the outer circumferential surface of the separation roller.

  (4) In the above (1), preferably, the first feeding means and the second feeding means are provided on the outer peripheral surface of the same feeding roller.

  (5) In the above (4), preferably, the feeding roller has a structure that does not come into contact with the sheet returned by the separation roller and the roller proximity means.

  (6) In order to achieve the above-mentioned object, the present invention also uses the feed roller that rotates in the paper sheet transport direction and the separation roller provided at a position opposite to the feed roller to collect the paper sheets. A paper sheet transport method for separating and transporting the paper sheets one by one, wherein the paper sheets are fed out so as to be separated from the accumulated paper sheets and inserted between the feed roller and the separation roller; A sheet of paper inserted between the feed roller and the separation roller is moved so that a roller proximity means is brought close to an outer peripheral surface of the separation roller rotating in a direction opposite to the conveyance direction of the sheet. A procedure for returning the leading edge to a predetermined position, and a procedure for feeding the paper sheet returned to the predetermined position and reinserting it between the feed roller and the separation roller.

  ADVANTAGE OF THE INVENTION According to this invention, the front-end | tip can be arrange | positioned in a predetermined position, avoiding buckling of paper sheets, and the double feeding of paper sheets can be prevented.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a schematic structure of an embodiment of a paper sheet conveying apparatus of the present invention, and FIG. 2 is a top view. FIG. 3 is a side view of the feed roller and the separation roller as seen from the direction of arrow A in FIG.

  1 to 3, the paper sheet conveying device separates and conveys the accumulated paper sheets (P1, P2,... In order from the upper side in FIG. 1, collectively referred to as P) one by one. To do. This paper sheet conveying apparatus includes, for example, two feeding rollers 2 (feed rollers) that rotate in the conveying direction of the paper sheet P (that is, counterclockwise in FIG. 1) by the rotation of the rotating shaft 1, and the feeding rollers 2. For example, two separation rollers 4 (gate rollers) that are arranged so as to face each other and rotate in a direction opposite to the conveyance direction of the paper sheet P by rotation of the rotation shaft 3 (that is, counterclockwise in FIG. 1), and a rotation shaft For example, two feeding rollers 6 (pickup rollers) that rotate in the conveyance direction of the paper sheet P (ie, counterclockwise in FIG. 1) by the rotation of 5 and feed the paper sheet P in the conveyance direction (right direction in FIG. 1). And a pressing plate 7 for pressing the accumulated paper sheet P against the feeding roller 6 and a guide 8 for restricting the accumulated paper sheet P from moving in the transport direction. Although not shown in detail, the rotation shaft 1 of the delivery roller 2, the rotation shaft 3 of the separation roller 4, and the rotation shaft 5 of the feeding roller 6 are connected to each other by a timing belt, a gear, or the like, and are rotated by a drive motor. Thus, synchronous rotation is performed while the relative speed is adjusted.

  The feeding roller 6 having a substantially cylindrical structure is provided with a first feeding rubber portion 9 (first feeding means) having a high friction coefficient at a part of the outer peripheral surface (for example, a portion of about 60 degrees), and other portions (for example, the outer peripheral surface). Similarly, a second feeding rubber portion 10 (second feeding means) having a high friction coefficient is provided on the opposite side of the first feeding rubber portion 9 and a portion of about 90 degrees, and the other portions are the same. It is made of a metal or resin having a sufficiently low coefficient of friction. The paper sheet P is fed out by the first feeding rubber portion 9 or the second feeding rubber portion 10 of the feeding roller 6 and inserted between the feeding roller 2 and the separation roller 4.

  The delivery roller 2 is a roller having a large diameter at the center and both sides in the axial direction and a small diameter between them, and the separation roller 4 is formed at a large diameter at both sides in the axial direction. It is a roller having a small diameter between the rollers. The delivery roller 2 and the separation roller 4 are nested in an overlap amount δ (so-called overlap method). A part of the outer peripheral surface of the large-diameter part of the delivery roller 2 (for example, a part of about 90 degrees) is provided with a delivery rubber part 11 (send part) having a high friction coefficient, and other parts have a sufficiently low friction coefficient. It is made of metal or resin. Note that the phase of the feeding rubber portion 11 of the feeding roller 2 is the same as the phase of the second feeding rubber portion 10 of the feeding roller 6. Further, the separation roller 4 is made of, for example, a rubber material, and the friction coefficient thereof is smaller than the friction coefficient of the sending rubber portion 11 of the sending roller 2 and other parts of the sending roller 2 (including an eccentric roller 12 described later). ) Is greater than the friction coefficient. With such a configuration, the paper sheet P inserted between the feed roller 2 and the separation roller 4 is slightly deformed into a wave shape and is sent out by the feed rubber portion 11 of the feed roller 2.

  Further, as the greatest feature of the present embodiment, the small diameter portion of the feed roller 2 is formed as an eccentric roller 12. FIG. 4 is a side sectional view showing the detailed structure of the eccentric roller 12.

  In FIG. 4 and FIG. 1 described above, assuming the virtual roller S that is in contact with the outer peripheral surface of the large-diameter portion of the separation roller 4 with the axis O as the center, the eccentric roller 12 is smaller than the radius r of the virtual roller S. It has a radius and is provided so as to be eccentric with respect to the axis O by an eccentric amount e. The outer peripheral surface of the eccentric roller 12 has a distance d from the axis O at the pull-in phase θ1 smaller than the radius r of the virtual roller S, and a distance d from the axis O at the protrusion phase θ2 from the radius r of the virtual roller S. It is getting bigger. Further, the projecting phase θ2 of the eccentric roller 12 is after the phase of the first feeding rubber portion 9 of the feeding roller 6 and before the phase of the second feeding rubber portion 10 (in other words, the sending rubber portion of the sending roller 2). 11).

  For example, when the eccentric roller 12 is in the pulling phase θ1 with respect to the separation roller 4, a space is formed between the outer peripheral surface of the large-diameter portion of the separation roller 4 and the outer peripheral surface of the eccentric roller 12. ing. On the other hand, for example, when the eccentric roller 12 is in the projecting phase θ2 with respect to the separation roller 4, the outer peripheral surface of the large-diameter portion of the separation roller 4 and the outer peripheral surface of the eccentric roller 12 are close to each other. At this time, since the friction coefficient of the eccentric roller 12 is smaller than the friction coefficient of the separation roller 4, the paper sheet P inserted between the feed roller 2 and the separation roller 4 is returned by the separation roller 4, and the paper The tips of the leaves P are aligned at a predetermined position (specifically, the upstream position where the pressure contact between the separation roller 4 and the eccentric roller 12 does not reach).

  Next, the operation of the paper sheet transport device according to the present embodiment will be described. As shown in FIG. 1 described above, the lengths of the stacked paper sheets P are different from each other, and the leading end position of the second sheet P2 is moved in the transport direction from the leading end position of the first sheet P1. The operation when the distance X is shifted will be described with reference to FIGS. 5A, 5B, 6A, 6B, 7A, and 7B. To do.

  First, the first feeding rubber portion 9 of the feeding roller 6 feeds the first sheet P1 so as to be separated from the accumulated sheets P. At this time, if the second sheet P2 is taken out, the leading end of the second sheet P2 is fed out before the leading end of the first sheet P1. On the other hand, the eccentric roller 12 is in the drawing phase θ1 with respect to the separation roller 4, and a space is formed between the separation roller 4 and the eccentric roller 12 (see FIG. 5B). Therefore, two paper sheets P1 and P2 are simultaneously inserted between the feed roller 2 and the separation roller 4 (see FIG. 5A).

  Thereafter, the eccentric roller 12 enters the projecting phase θ2 with respect to the separation roller 4, and the separation roller 4 and the eccentric roller 12 approach each other (see FIG. 6B). As a result, the separation roller 4 returns the two sheets P1 and P2 and aligns the tips of the sheets P1 and P2 at a predetermined position (see FIG. 6A).

  Since the leading ends of the paper sheets P1 and P2 are aligned, the second feeding rubber portion 10 of the feeding roller 6 feeds only the first paper sheet P1. On the other hand, the eccentric roller 12 is in the drawing phase θ1 with respect to the separation roller 4, and a space is formed between the separation roller 4 and the eccentric roller 12 (see FIG. 7B). Therefore, the paper sheet P <b> 1 is reinserted between the feed roller 2 and the separation roller 4. Then, the delivery unit 11 of the delivery roller 2 sends out the paper sheet P1 and delivers it to, for example, a downstream transport roller or the like (not shown) (see FIG. 7A).

  Thus, in the present embodiment, after the paper sheets P1 and P2 are once inserted between the feed roller 2 and the separation roller 4, the eccentric roller 12 approaches the separation roller 4 so that the separation roller 4 becomes the paper. The leaves P1 and P2 are returned, and the tips of the paper sheets P1 and P2 can be aligned at a predetermined position. Thereby, after that, only the first sheet can be inserted between the feeding roller 2 and the separation roller 4 by the second feeding rubber portion 10 of the feeding roller 6, and double feeding can be prevented. . Also, unlike the prior art described in Patent Document 1, for example, the leading edge of the paper sheet P is not aligned by abutting against a roller or the like, so that buckling of the paper sheet P can be avoided. Therefore, in the present embodiment, it is possible to suppress the tip position while avoiding buckling of the paper sheet P, and it is possible to prevent double feeding.

  In the present embodiment, although the operation of returning the paper sheet P is performed at the timing described above, the separation roller 4 and the eccentric roller 12 are always rotated, that is, not intermittently driven. Is possible. In addition, a driving motor for intermittent driving is unnecessary and can be realized at low cost.

  In the above embodiment, the case where the feeding roller 6 has a substantially cylindrical structure has been described as an example. However, the present invention is not limited to this. That is, for example, as shown in FIG. 8, a part of the feeding roller 6 may be cut out so as not to contact the paper sheet P returned by the separation roller 4 and the eccentric roller 12. In such a modification, it is possible to avoid buckling of the paper sheet P that may occur when returned by the separation roller 4 and the eccentric roller 12.

  Moreover, in the said one Embodiment, although the case where the supply roller 6 which has the 1st delivery rubber part 9 and the 2nd delivery rubber part 10 was provided was demonstrated as an example, it is not restricted to this, The 1st delivery rubber part 9 is provided. The feeding roller having the feeding roller and the feeding roller having the second feeding rubber portion 10 may be provided separately. In this case, the same effect as described above can be obtained.

  In the above-described embodiment, the case where the eccentric roller 12 is provided as the small-diameter portion of the feed roller 2 has been described as an example, but the present invention is not limited thereto. That is, instead of the eccentric roller 12, for example, as shown in FIG. 9, an arc member 13 corresponding to the outer peripheral portion in the protruding phase θ <b> 2 of the eccentric roller 12 may be provided. Further, although not shown, for example, a movable roller that is movable so as to be close to the separation roller 4 may be provided. Even in such a modification, the same effect as described above can be obtained.

  Further, in the above embodiment, the case where the present invention is applied to an overlap type paper sheet conveying apparatus has been described as an example. However, the present invention is not limited to this, and the present invention may be applied to a pressure contact type paper sheet conveying apparatus. Good. That is, for example, another separation roller and roller proximity means (eccentric roller or the like) that is movable so as to be close to the outer peripheral surface of the separation roller at a position in the axial direction different from the feeding roller and separation roller that send out the paper sheets by pressure contact May be provided. In such a case, the same effect as described above can be obtained.

It is a side view showing the schematic structure of one Embodiment of the paper sheet conveying apparatus of this invention. It is a top view showing the schematic structure of one Embodiment of the paper sheet conveying apparatus of this invention. FIG. 2 is a side view of a feed roller and a separation roller as seen from the direction of arrow A in FIG. 1. It is a sectional side view of the feeding roller and the separation roller showing the detailed structure of the eccentric roller in one embodiment of the paper sheet conveying apparatus of the present invention. It is the side view for demonstrating the operation | movement in one Embodiment of the paper sheet conveying apparatus of this invention, and the side view seen from the arrow B direction. It is the side view for demonstrating the operation | movement in one Embodiment of the paper sheet conveying apparatus of this invention, and the side view seen from the arrow C direction. It is the side view for demonstrating the operation | movement in one Embodiment of the paper sheet conveying apparatus of this invention, and the side view seen from the arrow D direction. It is a side view showing the schematic structure of the modification of the paper sheet conveying apparatus of this invention. It is a sectional side view of the delivery roller showing the detailed structure of the circular arc member in the other modification of the paper sheet conveying apparatus of this invention.

Explanation of symbols

2 Feeding roller 4 Separating roller 6 Feeding roller 9 First feeding rubber part (first feeding means)
10 2nd delivery rubber part (2nd delivery means)
11 Sending rubber part (sending part)
12 Eccentric roller (roller proximity means)
13 Arc member (roller proximity means)

Claims (6)

A paper sheet conveying apparatus that separates and conveys the accumulated paper sheets one by one,
A delivery roller that rotates in the paper transport direction;
A separation roller that is provided at a position facing the delivery roller and rotates in a direction opposite to the conveying direction of the paper sheet;
First feeding means for feeding paper sheets so as to separate from the accumulated paper sheets, and inserting between the feeding roller and the separation roller;
Roller proximity means that is movable so as to be close to the outer peripheral surface of the separation roller in order to return the leading edge of the paper sheet inserted between the feed roller and the separation roller to a predetermined position;
A paper sheet conveying apparatus comprising: a second feeding unit that feeds the paper sheet returned to the predetermined position and reinserts the paper sheet between the feeding roller and the separation roller.   2. The paper sheet conveying apparatus according to claim 1, wherein the feeding roller is provided with a feeding portion having high friction at a part of an outer peripheral surface thereof, and the feeding of the paper sheet by the feeding portion of the feeding roller and the first roller are provided. 2. A paper sheet conveying apparatus, wherein paper sheet feeding by the two feeding means is synchronized.   2. The paper sheet transport apparatus according to claim 1, wherein the roller proximity means is an eccentric roller provided eccentrically with respect to a rotation shaft of the delivery roller, and after the paper sheet is fed by the first feeding means and the first paper feeding apparatus. 2. A paper sheet transporting apparatus, wherein an outer peripheral surface of the eccentric roller comes close to an outer peripheral surface of the separation roller before the paper sheet is fed out by two feeding means.   2. The paper sheet conveying apparatus according to claim 1, wherein the first feeding means and the second feeding means are provided on an outer peripheral surface of the same feeding roller.   5. The paper sheet conveying apparatus according to claim 4, wherein the feeding roller has a structure that does not contact the paper sheet returned by the separation roller and the roller proximity means. This is a paper sheet transporting method in which the stacked paper sheets are separated and transported one by one using a feed roller that rotates in the transport direction of the paper sheet and a separation roller provided at a position facing the feed roller. And
A procedure for delivering paper sheets so as to separate from the accumulated paper sheets, and inserting the paper sheets between the feed roller and the separation roller;
The leading edge of the paper sheet inserted between the feed roller and the separation roller, with the roller proximity means being moved so as to be close to the outer peripheral surface of the separation roller rotating in the direction opposite to the conveying direction of the paper sheet To return the to a predetermined position;
A paper sheet conveying method comprising: feeding out the paper sheet returned to the predetermined position and reinserting the paper sheet between the feed roller and the separation roller.

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