JPS5847488Y2 - Banknote sorting device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a banknote sorting device.

BACKGROUND ART In recent years, the number of automatic currency exchange machines, automatic vending machines, etc. that use banknotes has increased, and as a result, there has been a need for a device that can automatically and accurately distinguish between authenticity and falsity of banknotes.

Conventionally, this type of sorting machine detects the dimensions of banknotes, that is, the length and width, and the magnetic material contained in the printing ink of the banknotes.

Here, magnetic detection is performed by scanning a predetermined position in the longitudinal direction or width direction of the banknote.

On the other hand, banknotes are usually transported in their longitudinal direction,
Moreover, it is customary that the insertion direction can be either forward or reverse.

Therefore, in order to perform magnetic detection in both the forward and reverse directions of insertion of the banknote, in the case of longitudinal scanning, scanning is performed along the center line of the banknote, so if the banknote is thrown, it is necessary to In addition, when scanning in the width direction, it is necessary to provide two magnetic detection means if the banknote is stopped at a fixed position and scanned regardless of whether the banknote is inserted in the order or reverse. Must be.

However, since the magnetic detection means has a complicated structure and is expensive, it is desirable that one device can detect all kinds of cases.

The present invention has been developed in view of the above-mentioned points, and the magnetic scanning direction is set in the width direction of the banknote, and the banknote feed stop position for this scanning is determined by the insertion direction of the banknote, and a single magnetic scanning means is used. This is a bill sorting machine that can perform magnetic scanning regardless of the direction in which bills are inserted.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1a and 1b are longitudinal sections of an embodiment of the present invention and their
- A cross section along the X-line is shown, and in the figure a, 1 is a banknote holder, and this holder 1 is connected to a banknote passage 2.

The banknote path 2 runs horizontally in the portion connected to the holder 1, and then extends vertically, and conveyor belts are arranged in parallel in most of the path.

3 and 4 are pulleys, one of which is driven by a motor (not shown), and pulleys 3 and 4, which transport the conveyor belt 5, are arranged opposite to each other across the banknote path 2. It is in contact with pulley 6°I via belts 5 and 8-.

As a result, when a bill is inserted from the bill holder 1, the bill slides along the bill path 2, is sandwiched between the belts 5.8 from the contact portion between the pulleys 3 and 6, and is conveyed.

In addition to this, an electromagnetic shutter SQL, an optical detection detector PD, and a magnetic detection device 9 are provided on this conveyance path.

Of these, the electromagnetic shutter SQL is provided to prevent the acceptance of fraudulent banknotes or banknotes in an abnormal orientation, and to prevent the banknotes that have been accepted to be pulled back.

The optical detection detectors PD are arranged as shown in the figure to detect the width and length of banknotes, watermarks, and insertion direction.

Furthermore, the magnetic detection device 9 is provided to detect magnetic material in the ink in the design of a specific portion of the banknote.

When a banknote is inserted, the width of the banknote is first detected by the detector PD1, and if the banknote is not a fake banknote, the electromagnetic shutter SQL opens and accepts the banknote.

As a result, the banknote is sent along the conveyance path, and the banknote insertion direction (presence or absence of a watermark), length, and design are detected.

Among these, the insertion direction of the banknote is determined by the detectors PD5 and PD8.
, PD9, and the detector P
D6. Watermark detection is performed by each set of PD8 and PD7°PD9.

Watermark detection will be described later using FIGS. 3a and 3b.

Further, the length is determined by the detectors PD2, PD3 and PDto.

Further, whether or not the symbol is appropriate is determined by using the apparatus shown in FIG. 4, which will be described later, after stopping the banknote based on the position detection signals of the detectors PD4, PD6 and PD7 using the insertion direction detection result.

Figure 2 shows the detector PD used for these detection operations.
This is an enlarged view of the arrangement of PD to.
The case of a 0 yen bill will be explained as an example.

a) Bill insertion direction detection (watermark detection) This is detected by detector PD6. PD8 and PD7, PD9,
and PD5.

In the case of a 1,000 yen bill, the watermark is located on the left end when the bill is viewed from the normal surface, so the insertion direction of the bill can be clearly distinguished between the watermarked side and the non-watermarked side.

When the bill is inserted from the watermarked side, the tip of the bill will be detected by the detector PD8. Watermark detection is performed after passing through PD9, and when the bill is inserted from the non-watermarked side, the watermark is detected after the trailing edge of the bill passes through detector PD5.

Therefore the set of detectors PD6, PD8, or PD7
, PD9, and the banknote edge detection result by the detector PD5 or PD8°PD9, the insertion direction of the banknote can be determined.

b) Length detection This is performed by detectors PD2, PD3, PDlo.

The length of a 1,000 yen bill is approximately 163m+n, so when the leading edge of the bill hits the detector PDto, the trailing edge is P.
L=163wn is set so that genuine banknotes are detected when the value is between D2 and PD3.

PD2 and PD3, taking into account the expansion and contraction associated with the circulation of banknotes.
The center-to-center distance d=5wn.

C) Detection of bill stop position for pattern detection This is performed by detectors PD4, PD6, PD7.

Since symbol detection involves magnetically scanning a predetermined portion of the banknote, it is necessary to stop the predetermined portion of the banknote in alignment with the magnetic scanning section, regardless of the insertion direction of the banknote.

Therefore, when a banknote is inserted from the watermarked side, the rear end of the banknote is detected by the detector PD6.

When the banknote is removed from the PD7, or vice versa, when the bill is inserted from the non-watermarked side, the feeding of the banknote is stopped when the trailing edge of the banknote is removed from the detector PD4, and the flow shifts to magnetic scanning.

In other words, when the trailing edge of the banknote passes through the detector PD4,
If a signal with a steep rise can be obtained, a positive pulse can be obtained by differentiating this, and a signal with a steep rise can be obtained when the tip of the bill passes through the detectors PD6 and PD7. Then, by differentiating this, a positive pulse can be obtained.

Among these, it is necessary to stop bill feeding using the output of PD4 when a bill is inserted from the side without a watermark, and in this case, watermark detection has not yet been performed at the time when a positive pulse is generated.

Therefore, the output of the detector PD4 may be used as one input, and the output of an inhibit circuit to which a watermark detection signal, which will be described later, is provided as the other negative input may be provided to the banknote feeding circuit.

Thereby, it is possible to prevent bill feeding from being stopped when a bill is inserted from the watermarked side.

Furthermore, it is necessary to stop bill feeding using the outputs of the detectors PD6 and PD7 when the bill is inserted from the side with the watermark, and in this case, the bill trailing edge detection pulse is generated by the output of the detector PD4. Watermark detection should have already been performed at the time of occurrence, and as a result, the counterfeit banknotes have already been returned.

Since magnetic scanning is performed only when a watermark is detected on a banknote, the watermark detection signal held in advance in a circuit (not shown) is used as one input, and the other input is used to detect the banknote edge using detectors PD6 and PD7. The output of the AND circuit to which the pulse is applied may be applied to the banknote feeding circuit.

This can prevent bill feeding from being stopped when bills are inserted from the non-watermarked side.

FIGS. 3a and 3b show an example of the circuit configuration of the optical detection device used in the above embodiment and signal waveforms of each part thereof.

Although only the configuration of the detectors PD6 and PD8 in FIG. 1 is shown here, the same applies to PD7 and PD9, which are provided as a countermeasure against insertion in the reverse direction.

Both detectors PD6 and PD8 have a light emitter PE and a light receiver PR, and the light from the light emitter PE passes through the banknote A to the light receiver PR.
Detected by

Assume that the bill is a 1,000 yen bill and that it is inserted from the side with the watermark.In this case, the output of the receiver PR rises sharply at the tip of the bill, and the part without the pattern becomes flat.
At the next L, it falls slowly at the watermark area, then rises gently, and then continues to the symbol area and reaches the end of the banknote (b-a in the same figure).Although the detectors PD6 and PD8 are ahead in time, They produce outputs of the same waveform, and in the same figure, A corresponds to PD6 and mouth corresponds to PD8, respectively.

In other words, the output of the detector PD6 is amplified by the amplifier AMP1, and the output of PD8 is the output of the amplifier A.
The output amplified by MP2 is the output.

These two outputs are applied to a differential amplifier DA, and a low-intensity output is taken out and applied to a comparator COM, where it is compared with a reference voltage.

Then, the portion of the output that exceeds the reference voltage 2 is given to the AND circuit AND as an output E.

A timing signal is applied to the AND circuit AND as the other input.

This is due to a circuit not shown, so that the tip of the bill is connected to the detector PD8.
.

This is given when a predetermined time has elapsed after reaching PD9.

If applied to the timing signal during the duration of output E, the AND circuit AND produces an output, indicating that there is a watermark at the predetermined location on the bill.

Note that when a banknote is inserted in the opposite direction, the timing signal is given based on the time when the trailing edge of the banknote leaves the detector PD5, and the detectors PD7 and PD9 are used. different from.

FIG. 4 shows a circuit configuration of the magnetic detection device used in the above embodiment, and in the figure, MH is a magnetic head that scans a predetermined line of a banknote to detect magnetism.

The magnetic head MH is connected to a band amplifier AMP,
The detection signal is amplified by the magnetic head MH.

A detection circuit DET extracts only one polarity of the amplified signal, and then a characteristic signal is extracted by a waveform characteristic detection circuit ED.

Then, this waveform characteristic signal passes through the waveform reduction device LPF, and becomes only low frequency components, and is at different levels vth1. vth2. Comparator COMP with detection level set to vth3 1. The level is detected by COMP2 and COMP3, and the detection output is determined by the determination circuit S.

This allows the authenticity of the banknotes to be identified.

As described above, in the present invention, the magnetic scanning direction is the width direction of the banknote, and the banknote feed stop position for this scanning is determined by the insertion direction of the banknote. It is possible to provide a device that can perform magnetic scanning and determine authenticity regardless of the insertion direction.

[Brief explanation of drawings]

FIGS. 1a and 1b are longitudinal sectional views showing the structure of an embodiment of the present invention and a sectional view taken along the line X-X, FIG. 2 is an explanatory diagram showing the arrangement of the optical detector in the embodiment, Figure 3 a, b
is a diagram showing the circuit configuration and waveforms of each part of the watermark detection device used in the same example, and FIG. 4 is a block diagram showing the circuit configuration of the magnetic detection device. 2...Banknote aisle, 3
．． 4.6゜7...Pulley, 5,8...
Belt, PD...Photodetector, DA...
Differential amplifier, COM...Comparator, AND
...AND circuit, MH...magnetic head, ED...waveform characteristic detection circuit, vth...
...Detection level.

Claims (1)

[Scope of utility model registration request] A device having a light emitter and a light receiver provided at a predetermined position in a banknote passageway and detecting a watermark on a banknote passing through the passageway; a magnetic detection device for inspecting the pattern; and a magnetic detection device provided at a position where the terminal end of the bill passes when the bill is inserted into the passage from one end in the longitudinal direction and a predetermined portion of the bill matches the scanning position of the magnetic detection device. a first photodetector that generates an output when the banknote passes through the passage; and a position through which the terminal end of the banknote passes when the banknote is inserted into the passage from the other end in the longitudinal direction and a predetermined portion of the banknote coincides with the scanning position. a second photodetector that is provided at the watermark detector and generates an output when the bill passes through the banknote, and the banknote feeding is stopped in accordance with the outputs of the watermark detector and the first and second photodetectors. Device.