JPS60146386A - Sheet papers discriminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention determines whether a banknote is fit or not by detecting dirt on the banknote used in, for example, an automatic transaction device that handles banknotes or an automatic sorting and stacking device. The present invention relates to a paper sheet discrimination device such as a banknote discrimination device.

[Technical background of the invention and its problems]

In general, banknote discriminating devices that determine whether a banknote is good or bad by detecting dirt on the banknote measure the integrated value of the amount of transmitted light and the amount of reflected light in a specific area on the banknote, and to detect dirt and remove it. In this case, if there is a hole on the banknote, a signal that is 4 to 8 times the normal signal is output as a transmission signal, which affects the integral value and allows the banknote to be determined as a genuine banknote even though it is dirty. There have been times when I have been In addition, when using the amount of reflected light, if there is a hole, the output of the background on the back side is received, so when the background is white, the amount of reflected light is extremely large, and when the background is black, the amount of reflected light is extremely small. However, it has the disadvantage that it affects the integral value and the discrimination performance is unstable. There is also a system that rejects (distinguishes as unfit) bills by detecting holes, but these have the drawbacks of strict standards and rejecting even holes outside the dirt integration area.

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to prevent the integrated value of the amount of transmitted light or reflected light from changing due to the presence of holes in paper sheets, and to prevent stains that are stable. An object of the present invention is to provide a paper sheet discrimination device that can perform detection.

[Summary of the invention]

This invention detects the amount of transmitted light or the amount of reflected light of paper sheets with a light amount detection means, detects the presence or absence of a hole based on this detection signal, and generates a light amount signal from the light amount detection means in accordance with the hole detection signal resulting from this detection. This masked signal is integrated, and the presence or absence of dirt is detected based on the integration result.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a banknote (paper sheet) 1 is conveyed on a conveyance path 2 in the direction of arrow A by a conveyance mechanism (not shown). As shown in FIG. 2, there may be stains a on the banknote l, or there may be holes. A pack ground 3.degree. 4 in which black standards and white standards are arranged in a striped manner is arranged across the transport path 2 for the banknotes 1. A transmitted light amount detector (first detector) 5 that detects the amount of transmitted light of the banknote 1 in the direction perpendicular to the conveyance path 2
is provided. This detector 5 is composed of a light source 6, a lens 7, and a light receiving element (line sensor) 8.

Further, a reflected light amount detector 9 is provided below the conveyance path 2 to detect the amount of reflected light from one side of the banknote 1. This detector 9 includes the light source 6, lens 10, and light receiving element (
line sensor) 11. moreover,
A reflected light amount detector 12 is provided above the conveyance path 2 to detect the amount of reflected light from the other side of the banknote 1.

This detector 12 is composed of a light source 13, a lens 14, and a light receiving element (line sensor) 15.

On the other hand, the output of the detector 5 and the output of the light receiving element 15 are passed through an amplifier 16 to a hole detection circuit 17 and a dirt circuit 1.
is supplied to one input end of 8. The hole detection circuit 17 outputs a hole detection signal when the supplied signal exceeds a slice level which is higher than the level when the signal passes through the white portion. The hole detection signal from the hole detection circuit 17 is supplied to the other input terminal of the dirt circuit 18 and also to the delay circuit 19. This delay circuit 19 delays the supplied signal and outputs a mask signal from an output terminal 191 while corresponding to the hole detector 9, and corresponds to the hole detector 12. While the output end 19. It outputs a mask signal from. That is, the delay circuit 19 outputs a delayed signal from the output terminal 19 by the time the banknote 1 is transported from the detection position C of the detector 5 to the detection position d of the detector 9, and the signal is delayed from the detection position C of the detector 5 to the detection position d of the detector 9. C to detector 1
A signal delayed by the time the banknote 1 is conveyed to the detection position e of the output terminal 19.2 is sent to the output terminal 19. It is designed to output from.

The output end 19. The signal from the detector 9 is supplied to one input terminal of a dart circuit 20, and the output of the output light receiving element 11 of the detector 9 is supplied via an amplifier 23 to the other input terminal of the dart circuit 20. . 1. The output end 19. The signal from the detector 12 is supplied to one input terminal of the gate circuit 21, and the output of the light receiving element 15 is supplied to the other input terminal of the dart circuit 21.
Supplied via. The outputs of the dart circuits 20 and 21 and the signals from the dart circuit 18 are processed by a processing circuit 2.
2. This processing circuit 22 includes an r-to circuit 1B,
The detection signals from the detectors 5 and 9.12 supplied from the detectors 20.21 and 9.12 are each integrated, and the signals obtained by masking them with the large detection signals are integrated, and the calculated value of these integration results is determined to be greater than or equal to a predetermined value. It determines whether there is dirt or not depending on the
When it is determined that there is dirt, a dirt detection signal is output.@The above calculation is, for example, by halving the integral value of the amount of reflected light from the dirt circuits 20 and 21 and the integral value of the amount of transmitted light from the dirt circuit 18. It was designed to add things. Next, the operation in such a configuration will be explained.

For example, now, a banknote 1 is being conveyed on the conveyance path 2, and the detector 5
Detection position C is opposite to the detection position C. Then, the light receiving element 8 converts the amount of light transmitted through the banknote 1 into an electrical signal, and the electrical signal is sent to the hole detection circuit 17 and the dirt circuit 1 via the amplifier 16.
8. When the banknote 1 faces the detection position d of the detector 9, the light receiving element 10 converts the amount of light reflected from the bottom surface of the banknote 1 into an electric signal, and the electric signal is sent to the amplifier 2.
3 to the dart circuit 20. 1 more banknote
is transported, and the detector 1 of the detector 12 is transported. When facing the banknote 1 , the light receiving element 15 converts the amount of light reflected from the top surface of the bill 1 into an electrical signal, and the electrical signal is supplied to the dart circuit 21 via the amplifier 24 .

In such a state, it is assumed that a hole opened on the banknote 1 faces the detection position C of the detector 5.

Then, an electric signal corresponding to the amount of transmitted light at this time is output from the light receiving element 8, and is sent to the hole detection circuit 17 via the amplifier 16.
supplied to As a result, the hole detection circuit 17 is supplied with a signal whose level is higher than that when the white portion is transmitted, and therefore outputs a hole detection signal. This hole detection signal causes the dart of the siggut circuit 18 to be closed. Therefore, the electrical signal from the detector 5 that is being supplied to the dirt circuit 18 is output to the processing circuit 22 in a masked state only while the hole detection signal is being output.

When the hole faces the detection position d of the detector 9, a signal is output from the output terminal 19□ of the delay circuit 19, and the dart of the dart circuit 20 is closed. Therefore, the electrical signal from the detector 9 that is being supplied to the dirt circuit 20 is output to the processing circuit 22 in a masked state only while the signal is being output from the output terminal 191. Further, when facing the detection position e of the hole detector 12, the output terminal 19 of the delay circuit 19. A signal is output from r-)
The dart of circuit 21 is closed. Therefore, the electric signal from the detector 12 that is being supplied to the dirt circuit 2 is output to the processing circuit 22 in a masked state only while the signal is being output from the output terminal 19°.

Therefore, a hole is detected based on the amount of light transmitted through the banknote, and the hole detection signal and a signal delayed by the transport time of the banknote are used to mask the amount of light transmitted and reflected from the banknote. As a result, both the amount of transmitted light and the amount of reflected light are in a dark state for most of the area, and a stable output can be obtained regardless of whether the background is black or white.

As a result, the processing circuit 22 has the dirt circuit 18°20.21
It integrates the signals supplied from the controller, calculates the integration results, detects whether there is dirt or not based on the value of the calculation result, and outputs a dirt detection signal if dirt is present.

As mentioned above, the amount of transmitted light and reflected light of the banknote is detected, excluding the amount of light caused by holes, and the integrated value is used to detect dirt. It is possible to perform stable dirt detection without any change.

In the above embodiment, the case where dirt is detected by the amount of reflected light and the amount of transmitted light on the front and back sides of the banknote was explained, but the present invention is not limited to this, and the case where dirt is detected by either the amount of reflected light or the amount of transmitted light is described. It may also be carried out.

〔Effect of the invention〕

As detailed above, according to the present invention, it is possible to prevent the integral value of the amount of transmitted light or the amount of reflected light from changing due to the presence of holes in paper sheets, and it is possible to perform stable stain detection. A discrimination device can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram schematically showing the overall structure, and FIG. 2 is a diagram for explaining a banknote. 1...Banknotes (paper sheets), a...dirt, b...hole,
2... Conveyance path, 5... Transmission light amount detector, 8, 11.
15... Light receiving element, 9.12... Reflected light amount detector,
17... Hole detection circuit, 1g, 20.21... Dirt circuit, 22... Processing circuit.

Claims (1)

[Claims] A conveyance path for conveying paper sheets, a light amount detection means for detecting the amount of transmitted light or reflected light of the paper sheets conveyed by this conveyance path, and the presence or absence of a perforation is detected based on the detection signal of this light amount detection means. A hole detection means, and a signal from the light amount detection means is masked according to a hole detection signal from the hole detection means, the masked signal is integrated, and it is detected whether or not dirt is present based on the result of this integration. A paper sheet discriminating device 0 characterized in that it is equipped with a dirt detection means.