JPH06183604A - Paper stack detector - Google Patents

Abstract

PURPOSE:To provide a paper stuck detector at a low cost which enables to find an abnormal paper thickness at a plural number of positions by a single sensor and whose constitution and control are easy. CONSTITUTION:A detection roller 21 contacts a reference roller 1. Further, another detection roller 22 is mounted on a central shaft 3 which is the central shaft of the detection roller 21. A conversion lever 4 is mounted on the central shaft 3, the lever 4 is connected with an angle sensor 5, and the central shaft 3 can oscillate around a shaft of the angle sensor 5. A pressin spring 6 is provided at one end of the conversion lever 4 and presses each detection roller on the reference roller 1 by constant force. A link device which is formed by the angle sensor 5, the conversion lever 4, and the central shaft 3 is sufficiently rigid, and the relative position of each detection roller is not changed due to oscillation. Paper money 8 is sandwiched and conveyed by a conveyance belt 7. Consequently, even if paper thickness below each roller differs, larger paper thickness is always detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects whether a bill is being conveyed normally or in an overlapping state in a bill discriminating device used in an automatic teller machine, for example. The present invention relates to an overlap detection device for paper sheets.

[0002]

2. Description of the Related Art In the prior art, for example, Japanese Patent Laid-Open No. 59-59
As described in the -60592 publication, there is always one thickness detecting means for one thickness measuring portion, and the width of the detecting roller and the detecting lever which are in contact with the reference roller for detection also has the detecting accuracy. In order to raise the bill, the bill was sufficiently smaller than the width of the bill (for example, 1 cm or less). However, under actual usage conditions, the state of the conveyed paper sheets, for example, half-fold (see the banknote overlapping states 81 and 82 in FIGS. 2 and 3)
In consideration of the above, if there is only one thickness detection site, reliable overlap detection cannot be performed. On the other hand, the detection accuracy cannot be improved by increasing the width of the detection roller arranged at the detection site, and when a plurality of thickness detection sites are provided, the same number of thickness measurement means must be provided. Therefore, there is a drawback that the configuration and control become complicated.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to increase the number of displacement measuring means even when a plurality of thickness measurement portions are provided in order to more reliably detect the overlap of paper sheets. An object is to obtain a paper sheet overlapping detection device that is simple in configuration and control without being caused.

[0004]

In order to achieve the above object, a plurality of detection rollers sharing a thickness reference member and a central axis which can be displaced with respect to the thickness reference member are provided, and the plurality of detection rollers are provided. The relative position of is to be unchanged.
Further, the position of the detection roller is adjusted so that a gap not larger than the minimum thickness of the paper sheet to be handled is provided between the detection roller at one end of the plurality of detection rollers and the thickness reference member.

[0005]

Since the present invention is configured as described above, when a paper sheet having a different thickness (state) enters each of the detection rollers, the maximum paper thickness is always measured. Overlap of classes is detected. Further, since it is not necessary to consider the detection accuracy of the detection roller at one end, it is possible to easily improve the detection accuracy of the detection device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a banknote overlap detection device according to an embodiment of the present invention. The reference roller 1 is used as the thickness reference member, and the outer peripheral surface of the reference roller 1 is a reference surface for the banknote thickness. To do. The detection roller 21 is in contact with the reference roller 1,
Further, another detecting roller 22 is attached to the central shaft 3 which is the central axis of the detecting roller 21. A conversion lever 4 is attached to the central shaft 3, and the central shaft 3 is connected to the angle sensor 5 via the conversion lever 4 and can swing about the axis of the angle sensor 5. A pressing spring 6 is provided at one end of the conversion lever 4, and presses the detection rollers 21 and 22 against the reference roller 1 with a constant force. Further, the link mechanism formed by the angle sensor 5, the conversion lever 4, and the central shaft 3 is made sufficiently rigid, and the relative position of the detection rollers 21 and 22 does not change due to the swing. Conveyor belt 7
Holds and conveys the paper sheet 8 (hereinafter, the paper sheet will be described as a banknote).

The measurement of the thickness of the bill with the above configuration will be described. When the bill 8 is fed between the reference roller 1 and the detection rollers 21 and 22 by the conveyor belt 7, the central shaft 3 moves by the thickness of the bill that has entered. At this time, the positional relationship between the detection rollers 21 and 22 is unchanged. This movement of the central shaft 3 causes the conversion lever 4 to tilt, and the shaft of the angle sensor 5 rotates in response to this tilt, which causes a voltage output to be output from the angle sensor 5, and this output measures the thickness. . Although two detection rollers are provided in the embodiment, three or more detection rollers may be provided depending on the size of various target paper sheets.

FIG. 2 shows a case where a bill 81 in which a two-fold folded bill and a regular bill overlap each other enters on the detection roller 21 side.
It is the schematic which showed the case where the banknote 82 in which the two-fold folded ticket and the normal ticket were piled up in the detection roller 22 side entered. The output of the angle sensor 5 at this time is the bill 3 in any case.
The output is equivalent to the thickness of one sheet. That is, even if the banknotes in the width direction of the banknote conveyance path have different overlaps, an output corresponding to a large overlap is always obtained,
No more overlooking banknote stacks.

Next, a second embodiment of the present invention will be described. The configuration of the banknote overlap detection device of the second embodiment is almost the same as the configuration of the banknote overlap detection device of the first embodiment, but there are the following differences. That is, the first
In the second embodiment, the detection roller 21 and the detection roller 22 are both in contact with the reference roller 1, but in the second embodiment, the detection roller 21 is arranged so as to be in contact with the reference roller 1, but the detection roller 22 is , And the reference roller 1 are adjusted and arranged so as to have a gap equal to or smaller than the minimum thickness of handled bills. By doing so, in the first embodiment, in order to improve the detection accuracy, so-called "backlash" that occurs on the contact surface between the detection roller 21 and the reference roller 1 and on the contact surface between the detection roller 22 and the reference roller 1 is both generated. In the second embodiment, it is necessary to eliminate "backlash" generated in the contact surface between the detection roller 21 and the reference roller 1.
The detection accuracy can be easily improved.

In the second embodiment, when the banknotes are conveyed with both ends thereof being hung on the conveyor belt, even if one banknote is normally conveyed, a plurality of banknotes are conveyed in an overlapped state. However, the output of the angle sensor 5 becomes an output corresponding to the paper thickness of the bill that has entered the detection roller 21, and the overlap of the bills can be reliably detected. Next, the detection roller 21
The case where bills in different states (thicknesses) enter the detection roller 22 and the detection roller 22 will be described. When the state (thickness) of the bill that has entered the roller 21 side is larger than the difference between the state (thickness) of the bill that has entered the roller 22 and the gap, the output of the angle sensor 5 has entered the detection roller 21. The output corresponds to the paper thickness of the bill. On the contrary, when the state (thickness) of the bill that has entered the roller 21 side is smaller than the difference between the state (thickness) of the bill that has entered the roller 22 side and the gap, the output of the angle sensor 5 is the detection roller. The output corresponds to the difference between the paper thickness of the bill that has entered the 22 side and the gap.

FIG. 4 shows a case where a banknote 81, in which a two-folded banknote and a regular banknote overlap each other, enters on the detection roller 21 side, and FIG.
It is the schematic which showed the case where the banknote 82 in which the two-fold folded ticket and the normal ticket were piled up in the detection roller 22 side entered. The output of the angle sensor 5 at this time is an output corresponding to three times the paper thickness of the former, while the latter has an output value corresponding to the amount obtained by subtracting the gap from the three times the paper thickness. . The sensor output is shown in FIGS. However, the gap is adjusted to the paper thickness or less here, and the output of the latter does not become smaller than twice the paper thickness. Therefore, in the latter case, it is possible to recognize two sheets as a stack. Needless to say, even when there are four or more overlapping sheets, the overlapping can be detected. There are two cases shown in FIGS. 2 to 5 in which the banknotes pass through the banknote overlap detection unit without causing a jam and the paper thickness on the detection roller 21 side and the paper thickness on the detection roller 22 side differ. In most cases, a folded ticket and an ordinary ticket overlap each other, and in such a case, when the paper thickness on the detection roller 22 side is larger, it can be recognized as two-ply stacks as described above. Therefore, the overlapping of banknotes can be sufficiently detected by the second embodiment. It should be noted that the number of detection rollers may be three or more as in the first embodiment, and in this case, a gap may be provided between the detection roller and the reference roller at either end. In addition, the detection roller 2
The gap between 2 and the reference roller 1 is adjusted by inclining the adjustment bracket 9 on which the angle sensor 5 is mounted. A schematic diagram of the adjusting unit is shown in FIG.

[0012]

According to the present invention, it is possible to reliably detect an overlap even if a state such as a half-folded paper sheet occurs. Further, even when the movable detection roller is provided at a plurality of locations, the number of sensors for measuring the displacement amount of the detection roller can be set to one, and the configuration and control can be simplified. Further, since it is not necessary to consider the detection accuracy of the detection roller at one end, it is possible to easily improve the detection accuracy of the detection device.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a banknote overlap detection device that is an embodiment of the present invention.

FIG. 2 is a conceptual diagram when an overlapping banknote of a half-folded banknote and a regular banknote has entered an overlapping detection section.

FIG. 3 is a conceptual diagram when an overlapping banknote of a half-folded banknote and a regular banknote has entered the overlapping detection section.

FIG. 4 is a conceptual diagram of a second embodiment when an overlapping banknote of a half-folded ticket and an ordinary banknote has entered an overlapping detection unit.

FIG. 5 is a conceptual diagram of a second embodiment in the case where an overlapping banknote of a half-folded banknote and an ordinary banknote have entered the overlapping detection section.

FIG. 6 is a diagram showing a sensor output in the second embodiment.

FIG. 7 is a diagram showing a sensor output in the second embodiment.

FIG. 8 is a diagram showing a structure of a gap adjusting portion.

[Explanation of symbols]

 1 Reference Roller 21, 22 Detection Roller 3 Central Shaft Shaft 4 Conversion Lever 5 Angle Sensor 6 Pressing Spring 7 Conveyor Belt 8 Banknote 9 Adjustment Bracket 10 Stay

Claims (2)

[Claims] 1. A thickness reference member, a detection roller, a conversion lever having the detection roller attached at one end, an angle sensor engaged with the conversion lever, and a member for pressing the detection roller against the thickness reference member. In the paper sheet overlap detection device for detecting the paper sheet overlap by measuring the thickness of the paper sheets conveyed between the thickness reference member and the detection roller, a shaft is provided at one end of the conversion lever. And a plurality of the detection rollers are mounted at intervals with the shaft as the central axis, and the link mechanism formed by the angle sensor, the conversion lever and the shaft is sufficiently rigid. Overlap detection device. 2. The paper sheet overlapping detection device according to claim 1, wherein a handling paper sheet is provided between the detection roller at one end of the plurality of detection rollers attached to the shaft and the thickness reference member. A sheet overlap detection device, wherein the position of the detection roller at the one end is adjusted so that a gap having a thickness equal to or smaller than a minimum thickness is provided.