EP0725374B1 - Coin acceptor with device to test the hardness - Google Patents
Coin acceptor with device to test the hardness Download PDFInfo
- Publication number
- EP0725374B1 EP0725374B1 EP95117912A EP95117912A EP0725374B1 EP 0725374 B1 EP0725374 B1 EP 0725374B1 EP 95117912 A EP95117912 A EP 95117912A EP 95117912 A EP95117912 A EP 95117912A EP 0725374 B1 EP0725374 B1 EP 0725374B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coin
- coins
- sensor
- evaluation electronics
- coin acceptor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
- G07D5/06—Testing the hardness or elasticity
Definitions
- the invention relates to a coin operated device Device for determining the hardness of coins according to the preamble of patent claim 1 or 2.
- DE 41 38 018 describes a coin testing device for determining hardness of coins, in which a sensor a relatively hard stop surface in relation to the coin material having. With the help of evaluation electronics the period is determined and with a predetermined value compared that between the output signal of the sensor when the coin is struck and a rimpedement of the output signal is at the original value. The contact duration the coin with the stop surface of the sensor is used as a criterion for determining hardness. The period from the date the coin was struck at the sensor and the time of the coin jumping off is a reliable measure of coin hardness. This Period essentially depends on whether elastic or very soft materials for the coins, such as Lead is provided. The hardness of the stop surface must be large enough, at least larger than that of the material real coins, so that the generated and detected by the sensor Coin vibrations mostly from the coin hardness and depends to a small extent on other factors, like coin size, speed and sensor geometry.
- a sensor Piezo crystal In the known device is either a sensor Piezo crystal or a contact pin is used.
- the contact pin interacts with a high frequency foil that is arranged in the area of the coin track, so that a RF voltage generated by a high frequency generator the film can be capacitively coupled onto the coin.
- the invention has for its object a coin device with a device for determining the hardness of the beginning to improve the type mentioned so that falsified coins made of soft material, more clearly differentiated from real coins can be.
- the senor is resiliently arranged so that the first time a coin hits the stop surface follow further shocks.
- the sensor bounces on a first one Touches the coin and strikes at one of the the sensor mass and the spring constant at least once, preferably several times on the coin.
- the spring-sensor combination After has swung out for some time.
- the improvement of the invention now consists in the fact that not only a single measured value is generated, but several, from which the actual measurement result, for example by averaging, can be calculated.
- the evaluation electronics can, for example, the amplitudes determine the vibration generated by the individual impacts and with given values within a given Compare time interval. For example, there are three Amplitude values above a given level can do this speak for the authenticity of a coin. Alternatively or additionally can be the duration of an output signal from the sensor be measured between the striking of a coin on the sensor and the rimpedement of the output signal passed the original value. This time period lies with several successive processes within of a given range, this can be for a real one Apply coin. Alternatively, it can also be determined how many signals within a given time interval are above a certain amplitude accordingly the number of times the coin has struck the sensor. In the case of hard materials, the energy conversion is generally less than soft, so a large number of oscillation periods within a time interval is achieved.
- Spring formed by a leaf spring, at the end of which Sensor can be arranged.
- the spring can after a further embodiment of the invention at the same time as a ladder are used to connect the sensor to the evaluation electronics.
- Stop surface is punctiform or linear.
- the sensor can be on a Ground block must be arranged, which of course the vibration behavior co-determined by the spring. It is also conceivable that Omit the mass block and the only mass is the piezo sensor to leave.
- a coin 1 is shown, which is a coin career 2 rolls down.
- a sensor protrudes into the coin path 3 with a stop surface 4, which is a steel ball represents.
- a piezoelectric one Element 5 arranged that fixed with the steel ball is connected and preferably on a counter block 6 made of steel.
- the steel block 6 is one at the end Leaf spring 10 attached, attached to the device at 12 is. If the coin 1 hits the steel ball 4, arises on piezoelectric element 5 according to a voltage curve FIG. 3, which has a circuit arrangement 7 according to FIG. 2 and an operational amplifier 8 of evaluation electronics 9 is supplied.
- Fig. 3 it can be seen that within a predetermined time interval t n three recurring, decreasing in amplitude vibrations occur. Each vibration represents the striking of the steel ball 4 on the coin 1. When struck for the first time, the impact causes the sensor arrangement to rebound. Since this is suspended from the spring 10, the steel ball 4 can lift off the coin running surface. After a certain time, the steel ball 4 approaches the coin again, this process being repeated. It depends on the hardness of the coin 1 and the hardness of the steel ball 4 as well as the spring behavior of the spring arrangement made of leaf spring 10 and the mass of the sensor, steel ball and steel block.
- the period of the vibrations t 1 -t 0 ' t 1' -t 0 ' or t 1 " -t 0" is approximately the same, while the amplitude gradually decreases due to the inevitable vibration losses.
- the amplitudes of all vibrations in the positive range are greater than level A.
- Level A can be seen as a criterion for the authenticity of a coin. If the amplitudes are above level A in a predetermined time interval, authenticity is present. If they are below this, there is a false certificate.
- a much softer material, such as lead or the like which can otherwise be geometrically and approximated by the weight of a real coin, exhibits a completely different impact behavior.
- the number of vibrations per time interval t n can also be calculated. It is also possible to determine the number of vibrations per unit of time, which corresponds to the number of shocks per time interval. Although the amplitudes are smaller, they also last longer.
- the time integral may like that of a real one Coin.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Coins (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
Die Erfindung bezieht sich auf ein Münzgerät mit einer Vorrichtung zur Härtebestimmung von Münzen nach dem Oberbegriff des Patentanpruchs 1 bzw 2.The invention relates to a coin operated device Device for determining the hardness of coins according to the preamble of patent claim 1 or 2.
Aus der DE 41 38 018 ist eine Münzprüfeinrichtung zur Härtebestimmung von Münzen bekanntgeworden, bei der ein Sensor eine im Verhältnis zum Münzmaterial relativ harte Anschlagfläche aufweist. Mit Hilfe einer Auswerteelektronik wird der Zeitraum bestimmt und mit einem vorgegebenen Wert verglichen, der zwischen dem Ausgangssignal des Sensors bei dem Anschlagen der Münze und einer Wiederannäherung des Ausgangssignals an den Ursprungswert liegt. Die Kontaktdauer der Münze mit der Anschlagfläche des Sensors wird als Kriterium für die Härtebestimmung herangezogen. Der Zeitraum, der sich aus dem Anschlagzeitpunkt der Münze an dem Sensor und dem Zeitpunkt des Abspringens der Münze ergibt, ist ein zuverlässiges Maß für die Münzhärte. Dieser Zeitraum hängt im wesentlichen davon ab, ob elastische oder sehr weiche Materialien für die Münzen, wie zum Beispiel Blei vorgesehen wird. Die Härte der Anschlagfläche muß genügend groß sein, zumindest größer als die des Materials echter Münzen, damit die erzeugte und vom Sensor erfaßte Münzschwingung zum überwiegenden Teil von der Münzhärte und zum geringen Teil von anderen Faktoren abhängt, wie der Münzmasse, der Geschwindigkeit und der Sensorgeometrie.DE 41 38 018 describes a coin testing device for determining hardness of coins, in which a sensor a relatively hard stop surface in relation to the coin material having. With the help of evaluation electronics the period is determined and with a predetermined value compared that between the output signal of the sensor when the coin is struck and a rapprochement of the output signal is at the original value. The contact duration the coin with the stop surface of the sensor is used as a criterion for determining hardness. The period from the date the coin was struck at the sensor and the time of the coin jumping off is a reliable measure of coin hardness. This Period essentially depends on whether elastic or very soft materials for the coins, such as Lead is provided. The hardness of the stop surface must be large enough, at least larger than that of the material real coins, so that the generated and detected by the sensor Coin vibrations mostly from the coin hardness and depends to a small extent on other factors, like coin size, speed and sensor geometry.
Bei der bekannten Vorrichtung wird als Sensor entweder ein Piezokristall oder ein Kontaktstift verwendet. Der Kontaktstift wirkt mit einer Hochfrequenzfolie zusammen, die im Bereich der Münzlaufbahn angeordnet ist, so daß eine von einem Hochfrequenzgenerator erzeugte HF-Spannung über die Folie kapazitiv auf die Münze aufgekoppelt werden kann.In the known device is either a sensor Piezo crystal or a contact pin is used. The contact pin interacts with a high frequency foil that is arranged in the area of the coin track, so that a RF voltage generated by a high frequency generator the film can be capacitively coupled onto the coin.
Bedingt durch die vorzugsweise punktförmige Berührungsfläche und die sehr kurze Berührungszeit zwischen Münze und Anschlagfläche erzeugt das bekannte Verfahren eine relativ große Streuung der Meßwerte.Due to the preferably punctiform contact surface and the very short touch time between the coin and stop surface generates the known method relatively large spread of the measured values.
Der Erfindung liegt die Aufgabe zugrunde, ein Münzgerät mit einer Vorrichtung zur Härtebestimmung der eingangs genannten Art so zu verbessern, daß Falsifikate von Münzen aus weichem Material noch klarer von den echten Münzen unterschieden werden können.The invention has for its object a coin device with a device for determining the hardness of the beginning to improve the type mentioned so that falsified coins made of soft material, more clearly differentiated from real coins can be.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 bzw. 2 gelöst.This object is achieved through the features of the patent claim 1 or 2 solved.
Bei der Erfindung ist der Sensor federnd so angeordnet, daß bei einem ersten Auftreffen einer Münze auf die Anschlagfläche weitere Stöße nachfolgen. Bei einer entsprechenden Auslegung des Federverhaltens der Feder, auf die sich der Sensor abstützt, prallt der Sensor bei einer ersten Berührung von der Münze ab und schlägt nach einer von der Sensormasse und der Federkonstanten bestimmten Zeit mindestens einmal, vorzugsweise mehrfach an die Münze an. Bei jeder Berührung wird im Sensor und in der Münze Energie umgesetzt, wobei die Feder-Sensorkombination nach einiger Zeit ausgeschwungen ist. Die Verbesserung der Erfindung besteht nun darin, daß nicht nur ein einziger Meßwert erzeugt wird, sondern mehrere, aus denen dann das eigentliche Meßergebnis, zum Beispiel durch Mittelung, errechnet werden kann.In the invention, the sensor is resiliently arranged so that the first time a coin hits the stop surface follow further shocks. With a corresponding Interpretation of the spring behavior of the spring to which if the sensor is supported, the sensor bounces on a first one Touches the coin and strikes at one of the the sensor mass and the spring constant at least once, preferably several times on the coin. With each touch there is energy in the sensor and in the coin implemented, the spring-sensor combination after has swung out for some time. The improvement of the invention now consists in the fact that not only a single measured value is generated, but several, from which the actual measurement result, for example by averaging, can be calculated.
Die Auswerteelektronik kann zum Beispiel die Amplituden der durch die einzelnen Stöße erzeugten Schwingung ermitteln und mit vorgegebenen Werten innerhalb eines vorgegebenen Zeitintervalls vergleichen. Liegen zum Beispiel drei Amplitudenwerte über einem vorgegebenen Niveau, kann dies für die Echtheit einer Münze sprechen. Alternativ oder zusätzlich kann die Dauer eines Ausgangssignals des Sensors gemessen werden, die zwischen dem Auftreffen einer Münze auf den Sensor und der Wiederannäherung des Ausgangssignals an den Ursprungswert verstreicht. Liegt diese Zeitdauer bei mehreren aufeinanderfolgenden Vorgängen innerhalb eines vorgegebenen Bereichs, kann dies für eine echte Münze gelten. Alternativ kann auch festgestellt werden, wieviel Signale innerhalb eines vorgegebenen Zeitintervalls oberhalb einer bestimmten Amplitude liegen entsprechend der Anzahl der Anschläge der Münze an dem Sensor. Bei harten Materialien ist im allgemeinen der Energieumsatz geringer als bei weichen, so daß eine große Anzahl von Schwingungsperioden innerhalb eines Zeitintervalls erreicht wird. The evaluation electronics can, for example, the amplitudes determine the vibration generated by the individual impacts and with given values within a given Compare time interval. For example, there are three Amplitude values above a given level can do this speak for the authenticity of a coin. Alternatively or additionally can be the duration of an output signal from the sensor be measured between the striking of a coin on the sensor and the rapprochement of the output signal passed the original value. This time period lies with several successive processes within of a given range, this can be for a real one Apply coin. Alternatively, it can also be determined how many signals within a given time interval are above a certain amplitude accordingly the number of times the coin has struck the sensor. In the case of hard materials, the energy conversion is generally less than soft, so a large number of oscillation periods within a time interval is achieved.
Nach einer weiteren Ausgestaltung der Erfindung ist die Feder von einer Blattfeder gebildet, an deren Ende der Sensor angeordnet sein kann. Die Feder kann nach einer weiteren Ausgestaltung der Erfindung zugleich als Leiter dienen für eine Verbindung des Sensors mit der Auswerteelektronik.According to a further embodiment of the invention Spring formed by a leaf spring, at the end of which Sensor can be arranged. The spring can after a further embodiment of the invention at the same time as a ladder are used to connect the sensor to the evaluation electronics.
Eine andere Ausgestaltung der Erfindung sieht vor, daß die Anschlagfläche punkt- oder linienförmig ist. Dies ist jedoch aus der bereits oben genannten Druckschrift bekannt, ebenso wie die Ausgestaltung, daß die Anschlagfläche von einer Stahlkugel gebildet ist. Der Sensor kann auf einem Masseblock angeordnet sein, der naturgemäß das Schwingungsverhalten der Feder mitbestimmt. Es ist auch denkbar, den Masseblock fortzulassen und als einzige Masse den Piezosensor zu belassen.Another embodiment of the invention provides that the Stop surface is punctiform or linear. However, this is known from the publication already mentioned above, as well as the design that the stop surface of a steel ball is formed. The sensor can be on a Ground block must be arranged, which of course the vibration behavior co-determined by the spring. It is also conceivable that Omit the mass block and the only mass is the piezo sensor to leave.
Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.
- Fig. 1
- zeigt eine schematische Darstellung einer Vorrichtung nach der Erfindung.
- Fig. 2
- zeigt ein Schaltungsbild der Vorrichtung nach Fig. 1.
- Fig. 3
- zeigt ein Ausgangssignal des Sensors nach Fig. 1.
- Fig. 1
- shows a schematic representation of a device according to the invention.
- Fig. 2
- shows a circuit diagram of the device of FIG. 1st
- Fig. 3
- shows an output signal of the sensor of FIG. 1st
In Fig. 1 ist eine Münze 1 dargestellt, die eine Münzlaufbahn
2 hinunterrollt. In die Münzlaufbahn ragt ein Sensor
3 mit einer Anschlagfläche 4 hinein, die eine Stahlkugel
darstellt. Unterhalb der Stahlkugel ist ein piezoelektrisches
Element 5 angeordnet, das mit der Stahlkugel fest
verbunden ist und sich auf einem Gegenblock 6 vorzugsweise
aus Stahl abstützt. Der Stahlblock 6 ist am Ende einer
Blattfeder 10 angebracht, die bei 12 gerätefest befestigt
ist. Trifft die Münze 1 auf die Stahlkugel 4, entsteht am
piezoelektrischen Element 5 ein Spannungsverlauf gemäß
Fig. 3, der über eine Schaltungsanordnung 7 nach Fig. 2
und einem Operationsverstärker 8 einer Auswerteelektronik
9 zugeführt wird.In Fig. 1, a coin 1 is shown, which is a coin career
2 rolls down. A sensor protrudes into the
Aus Fig. 3 erkennt man, daß innerhalb eines vorgegebenen
Zeitintervalls tn drei wiederkehrende, in der Amplitude
abnehmende Schwingungen auftreten. Jede Schwingung repräsentiert
das Anschlagen der Stahlkugel 4 an der Münze 1.
Bei einem ersten Anschlagen führt der Aufprall zu einem
Rückprallen der Sensoranordnung. Da diese an der Feder 10
aufgehängt ist, kann die Stahlkugel 4 von der Münzlauffläche
abheben. Nach einer gewissen Zeit nähert sich die
Stahlkugel 4 der Münze wieder an, wobei sich dieser Vorgang
wiederholt. Er ist abhängig von der Härte der Münze 1
und der Härte der Stahlkugel 4 sowie dem Federverhalten
der Federanordnung aus Blattfeder 10 und der Masse aus
Sensor, Stahlkugel und Stahlblock. Die Periodendauer der
Schwingungen t1 -t0' t1' -t0' oder t1" -t0" ist in etwa
gleich, während die Amplitude aufgrund der zwangsläufig
auftretenden Schwingungsverluste allmählich abnimmt. Es
ist jedoch erkennbar, daß die Amplituden aller Schwingungen
im positiven Bereich größer als das Niveau A sind. Das
Niveau A kann als Kriterium für die Echtheit einer Münze
angesehen werden. Liegen die Amplituden in einem vorgegebenen
Zeitintervall oberhalb des Niveaus A, liegt Echtheit
vor. Liegen sie darunter, liegt ein Falsifikat vor. Bekanntlich
legt ein viel weicheres Material, wie Blei oder
dergleichen, das ansonsten geomtrisch und vom Gewicht
einer echten Münze angenähert werden kann, ein völlig anderes
Stoßverhalten an den Tag.From Fig. 3 it can be seen that within a predetermined time interval t n three recurring, decreasing in amplitude vibrations occur. Each vibration represents the striking of the
Alternativ kann auch die Anzahl der Schwingungen pro Zeitintervall tn berechnet werden. Es ist ferner möglich, die Anzahl der Schwingungen pro Zeiteinheit zu ermitteln, was der Anzahl der Stöße pro Zeitintervall entspricht. Die Amplituden sind zwar kleiner, dauern aber auch länger. Alternatively, the number of vibrations per time interval t n can also be calculated. It is also possible to determine the number of vibrations per unit of time, which corresponds to the number of shocks per time interval. Although the amplitudes are smaller, they also last longer.
Dadurch ist das Zeitintegral u.U. gleich dem einer echten Münze.As a result, the time integral may like that of a real one Coin.
Durch das federnde Verhalten des Sensors 3 kann in jedem
Fall eine Mehrzahl von Meßwerten erhalten werden, die zum
Beispiel auch gemittelt werden können, um die Auswirkungen
von Streuwerten zu verringern.Due to the resilient behavior of the
Claims (7)
- A coin acceptor with a device to determine the hardness of coins, comprising a sensor containing a piezoelectric element that has a stop face which extends into the coin slideway, is relatively hard with respect to the coin material and is rolled over by the coins, and is stricken against by the coins, and an evaluation electronics which evaluates the oscillation behaviour of the piezoelectric element resulting from the impact with the coins and compares it to predetermined values, characterized in that the sensor (3) is resiliently arranged in such a way that if a first coin strikes against the stop face (4) more impacts will succeed and that the evaluation electronics (9) evaluates the oscillations provoked by the multiple impact, wherein the evaluation electronics counts the number of impacts per unit time and compares it to a predetermined value.
- A coin acceptor with a device to determine the hardness of coins, comprising a sensor containing a piezoelectric element which has a stop face which extends into the coin slideway, is relatively hard with respect to the coin material and is rolled over by the coins, and is stricken against by the coins, and an evaluation electronics which evaluates the oscillation behaviour of the piezoelectric element resulting from the impact with the coins and compares it to predetermined values, characterized in that the sensor (3) is resiliently arranged in such a way that if a first coin strikes against the stop face (4) more impacts will succeed and that the evaluation electronics (9) evaluates the oscillations provoked by the multiple impact, wherein the evaluation electronics compares the amplitudes of the individual oscillations to a predetermined value and establishes whether the amplitudes exceed the predetermined value within a predetermined time interval.
- The coin acceptor according to claim 1 or 2, characterized in that the spring (10) is a leaf spring.
- The coin acceptor according to claim 3, characterized in that the leaf spring is formed as a printed-circuit board for an electric connection between the sensor and the evaluation electronics.
- The coin acceptor according to any one of claims 1 to 4, characterized in that the stop face (4) is punctiform or line-shaped.
- The coin acceptor according to claim 5, characterized in that the stop face (4) is formed by a steel ball.
- The coin acceptor according to any one of claims 1 to 6, characterized in that the sensor (5) is arranged on a mass block.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19503765A DE19503765C1 (en) | 1995-02-04 | 1995-02-04 | Coin checking system with test for coin hardness |
| DE19503765 | 1995-02-04 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0725374A2 EP0725374A2 (en) | 1996-08-07 |
| EP0725374A3 EP0725374A3 (en) | 1998-05-20 |
| EP0725374B1 true EP0725374B1 (en) | 2002-11-27 |
Family
ID=7753237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95117912A Expired - Lifetime EP0725374B1 (en) | 1995-02-04 | 1995-11-14 | Coin acceptor with device to test the hardness |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0725374B1 (en) |
| DE (2) | DE19503765C1 (en) |
| ES (1) | ES2184781T3 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6138813A (en) * | 1999-06-03 | 2000-10-31 | Mars, Incorporated | Coin mechanism with a piezoelectric film sensor |
| EP1378867A1 (en) * | 2002-07-02 | 2004-01-07 | Azkoyen Medios de Pago, S.A. | Device and method for coin verification |
| EP1378866A3 (en) * | 2002-07-02 | 2004-04-21 | Azkoyen Medios de Pago, S.A. | Device and procedure for verification of coins |
| EP1383086A1 (en) | 2002-07-19 | 2004-01-21 | Mars, Incorporated | Coin validation by signal processing |
| ES2420204B1 (en) * | 2002-10-07 | 2015-03-17 | Azkoyen, S.A. | CURRENCY VERIFICATION DEVICE AND CURRENCY SELECTOR |
| ES2344874B1 (en) * | 2007-11-07 | 2011-06-28 | Azkoyen Medios De Pago, S.A. | DEVICE AND CURRENCY VERIFICATION METHOD. |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1001230A (en) * | 1946-03-29 | 1952-02-21 | Improvements made to rebound measuring devices, in particular those for determining the hardness of a part | |
| US3425263A (en) * | 1967-03-06 | 1969-02-04 | Gen Electric | Apparatus for measuring some mechanical properties of a material |
| DK327581A (en) * | 1981-07-23 | 1983-01-24 | Gnt Automatic As | PROCEDURE FOR CLASSIFYING MOUNTS ACCORDING TO THEIR MECHANICAL ELASTICITY |
| DE4138018C1 (en) * | 1991-11-19 | 1992-11-05 | National Rejectors Inc. Gmbh, 2150 Buxtehude, De |
-
1995
- 1995-02-04 DE DE19503765A patent/DE19503765C1/en not_active Expired - Fee Related
- 1995-11-14 EP EP95117912A patent/EP0725374B1/en not_active Expired - Lifetime
- 1995-11-14 DE DE59510476T patent/DE59510476D1/en not_active Expired - Lifetime
- 1995-11-14 ES ES95117912T patent/ES2184781T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19503765C1 (en) | 1996-05-02 |
| ES2184781T3 (en) | 2003-04-16 |
| DE59510476D1 (en) | 2003-01-09 |
| EP0725374A3 (en) | 1998-05-20 |
| EP0725374A2 (en) | 1996-08-07 |
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