JP2002230619A - Paper sheets thickness detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the accuracy of a paper sheets thickness detector. SOLUTION: The thickness detector includes a fixed reference roller 11, a movable detection roller 12 opposed to the reference roller 11, and a potentiometer 14 for detecting the displacement of the roller 12. The thickness of a paper sheet is found by detecting using the potentiometer 14 the displacement of the roller 12 when a bill passes between the reference roller 11 and the roller 12. The widths and positions of the reference roller 11 and the roller 12 are determined from the widths of a feed path and the bill, a bill feed position, and the position and width of a security thread 24. Security threads 42 provided in the bill are made to pass between the reference roller 11 and the roller 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet thickness detecting device mounted on an automatic bill receiving / dispensing device or the like.

[0002]

2. Description of the Related Art Conventionally, automatic transaction equipment, printing equipment, OCR
In, etc., a sheet thickness detecting device is provided, based on a detection result obtained by detecting the thickness of a sheet such as a card or a bill by the sheet thickness detecting device, The presence / absence of a tape affixed to the paper sheet, the authenticity of the paper sheet, and the like are determined.

The paper sheet thickness detecting device includes a fixed reference roller and a movable thickness detecting roller arranged opposite to the reference roller, and a paper sheet is inserted between the two. The thickness of the paper sheet is detected based on the displacement of the thickness detection roller. Note that the sheet thickness detecting device is provided with a gain correction value, an offset correction value, and an eccentricity correction value of the sheet thickness detecting device so that a delicate change in the sheet thickness can be detected by a sensor. Is calculated, and gain correction, offset correction, and eccentricity correction are respectively performed based on the calculation results.

FIG. 3 is a schematic diagram showing a configuration of a conventional sheet thickness detecting device. In FIG. 3, reference numeral 11 denotes a reference roller, and reference numeral 12 denotes a thickness detection roller disposed so as to face the reference roller 11. Hereinafter, the reference roller 11 and the thickness detection roller 12 are referred to as a thickness detection unit. Bearings 31 and 32 are provided at both ends of the reference roller 11 and are rotatably supported on the first shaft 51 without changing the position.

[0005] Bearings 33 and 34 are provided at both ends of the thickness detecting roller 12 and are rotatably supported so that their positions can be changed with respect to a second shaft 52. Numerals 35 and 36 are fulcrum brackets for instructing the bearings 33 and 34 to rotate freely, and are urged by springs 37 and 38, respectively.
4 is pressed against bearings 31 and 32.

[0006] Reference numeral 40 denotes a guide for guiding the conveyance of the paper sheets, and is provided on the upper surface and the bottom surface of the paper sheet conveyance path, respectively. 4A and 4B are diagrams showing the relationship between the thickness detection unit and the guide 40, wherein FIG. 4A is a perspective view, FIG.
(C) is a plan view. Reference numeral 40a denotes a hole provided in the guide 40, and the guide 40 and the thickness detection unit are arranged such that the thickness detection unit protrudes from the hole 40a to the transport path,
The paper sheet is conveyed by the rotation of the roller of the thickness detecting unit.

Here, the width tg from the reference roller 11 to the thickness detecting roller 12 is determined by the sheet thickness detecting device.
When the minimum value of the thickness of the sheet to be handled was t _s,
Considering minimum t _s of variations and sheet manufacturing errors thickness detecting device _{(± t s), t g} = t s -a × t e ... (1) a: given safety factor, it is inserted It is designed to be able to detect the thickness of torn sheets without fail.

Reference numeral 14 denotes a potentiometer connected to the fulcrum bracket 36, which detects a displacement of the thickness detecting roller 12 when a sheet is inserted between the reference roller 11 and the thickness detecting roller 12. , And converts the displacement into an electric signal. An amplifier 15 is connected to the potentiometer 14 and amplifies the electric signal output from the potentiometer 14.

Reference numerals 16, 18, and 19 denote a DA converter and an AD converter, respectively, for performing an analog / digital conversion of an electric signal. 17 is an amplifier 15
And an amplifier connected to the DA converter 16. The amplifier amplifies the electric signal output from the amplifier 15 and the DA converter 16 and outputs the amplified electric signal to the DA converter 18.

The CPU 20 includes a DA converter 16, a DA
The CP which is connected to the converter 18 and the EEPROM 21 and controls the entire sheet thickness detecting device.
U. Reference numeral 22 denotes a photo interrupter for detecting the rotation of the thickness detection roller 12, and an output signal of the photo interrupter 22 is input to a CPU 20, which will be described later.

The rotation of the reference roller 11 can be detected by the photo implanter 22. 5A and 5B are explanatory diagrams of the security thread 42. FIG. 5A shows a banknote including the security thread 42, and FIG.
FIG. 4 is a sectional view taken along line α-α in FIG. As shown in FIG. 5, the security thread 42 is formed by weaving discontinuously uneven lines on the surface of the banknote in order to make it difficult to generate a fake banknote.

[0012]

As described above, in the conventional sheet thickness detecting apparatus, the reference roller 11 and the thickness detecting roller 12 for detecting the sheet thickness are arranged discontinuously. The security thread 42 does not pass through the thickness detecting unit due to the variation in the bill transport position, and the guide 4
It may pass between zero.

For this reason, even if the banknotes are the same, the thickness of the banknotes detected differs depending on whether the security thread 42 passes through the thickness detecting section or between the guides 40, and the accuracy of the thickness detection is different. Was low. Therefore, an object of the present invention is to improve the accuracy of the sheet thickness detecting device.

[0014]

The present invention comprises a fixed reference roller, a movable thickness detecting roller disposed opposite to the reference roller, and a sensor for detecting a displacement of the thickness detecting roller. A thickness detecting device for detecting the displacement of the thickness detection roller when the bill passes between the reference roller and the thickness detection roller by the sensor to determine the thickness of the paper sheet, the transport path and The width and position of the reference roller and the thickness detection roller are determined from the width and width of the bill, the transport position of the bill, and the position and width of the concave / convex portions provided on the bill to determine the fake bill, and provided on the bill. The uneven portion may pass between the reference roller and a thickness detecting roller.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a case will be described as an example in which the thickness of a bill among bills is detected.
The invention is not limited to banknotes. (First Embodiment) In the first embodiment, the security thread always passes through the thickness detecting section.

FIG. 1 is an explanatory diagram showing the present embodiment. In FIG. 1, both ends of the transport path are denoted by L1 and R1, respectively.
Of the both ends of the bill, the end on the L1 side is L2 and R1
The end on the side is R2. Of the two ends of the security thread 42, the ends on the L1 and L2 sides are denoted by L3, R1 and R2.
The end on the side is R3.

Of the both ends of the thickness detecting section, the end on the L1 side is L
4. The end on the R1 side is R4. W is the width of the bill transport path, and X is the width of the bill 43 in the longitudinal direction, that is, L2 to R
The distance to 2. l1 and l2 are L2 to L, respectively.
3, the distance to R3, d1 and d2 are each L1
And L2, and the distance between R1 and R2.

L3 is the distance from L1 to L4,
m is the width of the thickness detector. Here, in order for the security thread 42 to be conveyed so as to pass through the thickness detecting section, the distance (d1 + 11) from L1 to L3 must be equal to or more than the distance 13 from L1 to L4, and the distance from L1 to R3
(D1 + l2) must be equal to or greater than the distance (l3 + m) from L1 to R4.

That is, it is necessary to satisfy the following condition: l3 ≦ l1 + d1 (2) d1 + l2 ≦ l3 + m (3) Substituting l1 and d1 into the above equation (2) to calculate the range of l3, and substituting d1, l2 and l3 determined from the equation (2) into the equation (3) to calculate the range of m. Thereby, the width and position of the thickness detecting unit can be determined.

For example, when d1 = 0, that is, when bills are transported along L1, l is given by equation (2).
The thickness detector is arranged so that 3 is equal to or less than 11 (3)
According to the formula, the width m of the thickness detecting section may be set to (l2-l3) or more. When d2 = 0, that is, when the bill is R1
D1 = W−X when transported along
The thickness detector is arranged such that l3 is equal to or less than (l1 + W−X) according to the equation (2), and the width m of the thickness detector may be equal to or more than (W−X + 12−13) according to the equation (3). .

As described above, by determining the position and size of the thickness detecting section from the transport path and the width of the bill, the transport position of the bill, the position and width of the security thread 42,
The security thread 42 can always pass through the thickness detector. (Second Embodiment) In the second embodiment, the presence / absence, authenticity, etc. of a tape affixed to a bill is determined from the thickness detection result obtained in the first embodiment.

FIG. 2 shows the result of the bill thickness detection performed using the paper sheet thickness detecting device according to the present embodiment. The horizontal axis represents the position of the bill in the short direction, and the vertical axis represents the position. Each output value is shown. (A) is a thickness detection result of a banknote having no security thread 42 or a false banknote. Since the security thread 42 is not provided, the output waveform becomes substantially flat.

FIG. 2B shows a result of detecting the thickness of the true banknote having the security thread 42. The irregularity of the security thread 42 is detected and a regular waveform is drawn. (C) shows the result of detecting the thickness of two bills having the security thread 42 by overlapping them, and the waveform obtained by doubling the output value of the waveform obtained in (b) is obtained. (D) is a result of detecting the thickness of a bill to which a foreign substance such as a tape is stuck, and a waveform having a constant output value is detected.

The thickness detection results (a) to (d) described above are stored in the CPU 20 or the like in advance. Then, by comparing the thickness detection result of the bill obtained by the sheet thickness detecting device with the thickness detection result stored in advance in the CPU 20 or the like, a true bill, a bill without the security thread 42, It is possible to determine a bill or the like in which a foreign substance such as a tape is stuck to the bill.

Further, it is possible to acquire bill transport error information such as whether or not bills are being fed one after another. Further, the waveforms stored in the CPU 20 are (a) to
The present invention is not limited to (d), and various thickness detection results can be stored in advance to discriminate bills.

In order to prevent the security thread 42 from being conveyed without passing through the thickness detector, the distance H between the thickness detector and the thickness detector should be sufficiently smaller than the width of the security thread 42. is necessary.

[0027]

As described above, according to the present invention,
The security thread 42 always passes through the thickness detector,
It is possible to discriminate true banknotes, banknotes without the security thread 42, banknotes being overlapped, and banknotes with foreign substances such as tapes stuck to the banknotes, and improve the accuracy of the sheet thickness detecting device. Become.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment.

FIG. 2 shows a result of thickness detection in the present embodiment.

FIG. 3 is a schematic diagram showing a configuration of a sheet thickness detecting device.

FIG. 4 is an explanatory diagram showing a relationship between a thickness detection unit and a guide.

FIG. 5 is an explanatory diagram of a security thread.

[Explanation of symbols]

 11 Reference Roller 12 Thickness Detection Roller 14 Potentiometer 15, 17 Amplifier 20 CPU 31-34 Bearing 35 Support Bracket 36 Support Bracket 37-38 Spring 40 Guide

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2F069 AA46 BB40 GG06 GG59 GG71 HH30 JJ13 NN08 PP07 3E041 AA03 AA09 BA04 BC04 CA01 DB07 EA04 EA05 3F048 AA06 AA08 AB03 BA06 BA11 BB02 BB10 CA02 DA06 DB06 DC17

Claims (4)

[Claims] 1. A fixed reference roller, a movable thickness detection roller disposed opposite to the reference roller, and a sensor for detecting a displacement of the thickness detection roller, wherein the bill is In a thickness detection device that determines the thickness of paper sheets by detecting the displacement of the thickness detection roller when passing between the reference roller and the thickness detection roller with the sensor, the width of the conveyance path and the width of the bill , From the position and width of the concave and convex portions provided on the bill to determine the banknote transport position, and fake bills, determine the width and position of the reference roller and the thickness detection roller, the irregularities provided on the bill A sheet thickness detecting device, wherein a portion passes between the reference roller and a thickness detecting roller. 2. A vehicle comprising a fixed reference roller, a movable thickness detection roller disposed opposite to the reference roller, and a sensor for detecting displacement of the thickness detection roller, wherein the bill is In the thickness detecting device for detecting the thickness of the paper sheet by detecting the displacement of the thickness detecting roller when passing between the reference roller and the thickness detecting roller by the sensor, the thickness detection result of the true bill The sheet thickness, in which the pattern is held in advance as a reference thickness detection result pattern, and the banknote for which the same thickness detection result pattern as the reference thickness detection result pattern is obtained is determined to be true. Detection device. 3. A fixed reference roller, a movable thickness detection roller disposed opposite to the reference roller, and a sensor for detecting displacement of the thickness detection roller, wherein the bill is In a thickness detection device that determines the thickness of paper sheets by detecting the displacement of the thickness detection roller when passing between the reference roller and the thickness detection roller with the sensor, at least one type of fake bill and A true banknote, and a thickness detection result pattern when the banknotes are over-fed are held in advance as a reference thickness detection result pattern, and the thickness detection result pattern obtained by performing the thickness detection of the banknote, and the reference thickness. A sheet thickness detecting device, wherein the sheet thickness detection device is configured to collate a detection result pattern to determine whether the bill is true or false and to obtain transport error information such as a bill overlap feed. 4. A vehicle comprising: a fixed reference roller; a movable thickness detection roller disposed to face the reference roller; and a sensor for detecting displacement of the thickness detection roller, In a thickness detection device for detecting the thickness of a sheet by detecting the displacement of the thickness detection roller when passing between the reference roller and the thickness detection roller with the sensor, the reference roller and the thickness A paper sheet thickness detecting device, wherein a width between thickness detecting portions formed by detecting rollers is sufficiently smaller than a width of an uneven portion provided on a true banknote for discriminating a false banknote.