EP0694888B1 - Device for testing coins or other flat objects - Google Patents
Device for testing coins or other flat objects Download PDFInfo
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- EP0694888B1 EP0694888B1 EP94111909A EP94111909A EP0694888B1 EP 0694888 B1 EP0694888 B1 EP 0694888B1 EP 94111909 A EP94111909 A EP 94111909A EP 94111909 A EP94111909 A EP 94111909A EP 0694888 B1 EP0694888 B1 EP 0694888B1
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- coin
- time
- acceleration
- light barrier
- masking
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- 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
- G07D5/02—Testing the dimensions, e.g. thickness, diameter; Testing the deformation
Definitions
- the invention relates to a device for checking the authenticity of coins or other flat objects of the type mentioned in the preamble of claim 1.
- Such coin validators are suitable, for example, for the identification of coins in telephone sets, vending machines, counters for measuring energy, etc.
- a coin validator of the type mentioned in the preamble of claim 1 is known from US 4,509,633.
- the chord length of a coin is determined by means of two light barriers by an average speed of the time periods during which the coin passes the first and the second light barrier
- the coin is determined and an approximate value for the chord length of the coin is calculated using this average speed and the length of time during which the coin covers both light barriers. This approximation depends on the initial speed of the coin as well as the acceleration of the coin.
- a coin validator is known from US Pat. No. 4,474,281, in which the coin falls through two light barriers in free fall.
- the distance in front of the light barriers must be at least 2.54 cm (1 inch), otherwise correction factors would have to be introduced to minimize the influence of the acceleration.
- a coin validator is known from CA 1 206 618, in which at least three light barriers are provided for measuring the chord length of the coin.
- an acceleration factor is provided which is a function of the measured time intervals. If the inclination of the coin channel changes, this factor must be redetermined experimentally.
- Another coin validator is known from FR 1'605'182.
- Two light barriers are provided along a coin channel, the time span that a coin needs to get from the first light barrier to the second light barrier and the time span during which the coin covers the second light barrier are compared with predetermined reference values. Such a measurement implicitly represents a determination of a chord length of the coin.
- a pawl which can be actuated by a relay is necessary, which stops the inserted coin and then releases the coin channel for the coin.
- a coin validator in which there is a pawl for opening the coin channel, a magnet braking the coin depending on its specific properties and two light barriers for determining the speed of the coin after passing the magnet. Taking into account the acceleration of the coin on the way from the first to the second light barrier is not provided. To further increase the reliability of the coin detection, two further light barriers are provided in front of the brake magnet, with which the speed of the coin can be determined before it enters the magnetic field of the magnet.
- EP 119,936 A1 discloses a coin validator for determining the diameter of a coin by means of two light barriers. The coin rolls along a coin channel and is subject to constant acceleration. An average speed is calculated from the time periods during which the coin covers the two light barriers and is used to correct the influence of the acceleration on the determination of the diameter.
- the invention is based on the object of proposing a coin validator in which the chord length of a coin to be tested can be determined in a simple and precise manner regardless of initial conditions.
- the device has a coin channel K, two light barriers L1 and L2 and electronic means E for detecting and evaluating the electrical signals emitted by the light barriers L1 and L2.
- the coin channel K is designed and provided with energy-absorbing elements in such a way that a jumping or jumping of the coin M between the two light barriers L1 and L2 is normally impossible.
- the coin channel K is designed as an inclined plane SE, which is inclined by the angle ⁇ with respect to the horizontal H.
- the coin M On the inclined plane SE between the two light barriers L1 and L2, the coin M now moves down with constant acceleration, which arises as a result of the gravitational force and frictional forces.
- the movement can be rolling without sliding, sliding without rolling, or a combination of rolling and sliding.
- the light barriers L1 and L2 are arranged above the inclined plane SE at a predetermined, identical height h and at a mutually predetermined distance L.
- the distance traveled by the coin M on the level SE at time t is designated by the coordinate x (t).
- the coin M has a mass m, a radius R and an moment of inertia I.
- the moment of inertia I is related to the axis of rotation leading through the center of gravity of the coin M.
- I 1 ⁇ 2mR 2 applies to a homogeneous coin.
- the length of the chord of the coin M running parallel to the inclined plane SE at the height h is denoted by B.
- the center of gravity of the coin M moves with the speed v (t).
- the rotation of the coin M around its center of gravity takes place with the angular velocity ⁇ (t).
- the energy E of the coin M is composed of potential energy E pot , kinetic energy E kin of the center of gravity and rotational energy E rot with respect to its center of gravity:
- the formula (9) for determining the chord length B of the coin M contains no terms which depend on its initial speed v 0 , its initial angular speed ⁇ 0 or on any physical constants.
- the times t 1 , t 2 and t 3 thus actually correspond to time differences.
- the acceleration of the coin M can also be calculated from the times t 1 , t 2 and t 3 .
- chord length B can still be determined from the times t 1 , t 2 and t 3 using the formula (9).
- the formula (9) for determining the chord length B is also valid for the case that the coin M rolls and slides, provided that the acceleration a of its center of gravity is approximately constant from time t 0 to time t 3 , that is on the route between the two light barriers L1 and L2.
- the times t 0 , t 1 , t 2 and t 3 can be measured with methods known per se with high accuracy.
- the signals emitted by the light barriers L1 and L2 are fed on separate lines to two inputs of a microprocessor, so that the distance L between the two light barriers L1 and L2 can be set as desired.
- the distance L is chosen to be larger than the chord B of the largest coin to be measured. Then the two light barriers L1 and L2 are never covered at the same time, so that the output signals of both light barriers L1 and L2 can be fed to a common input of the microprocessor.
- the microprocessor receives two pulses one after the other in both versions.
- the other three edges of the two pulses then determine the three times t 1 , t 2 and t 3 .
- the microprocessor uses the formula (9), the microprocessor then calculates the chord length B of the coin M, which serves as at least one decision criterion for accepting or rejecting the coin M.
- the specified formulas can of course be transformed or, if necessary, even replaced by an approximate formula, so that rounding errors can be avoided as far as possible when performing the calculation using a microprocessor.
- the advantage of the device described can be seen in the fact that neither the initial speed v 0 nor the initial angular speed go into the effective acceleration a of the coin M on its way from the first to the second light barrier in determining the chord length B.
- a stop device which can be actuated by means of a magnet, for example, in the coin channel in front of the first light barrier L1 is not required.
- the chord length B of a coin M is of the formula (9) with a Accuracy can be determined, which is in the alcohol range.
- the proposed coin validator is therefore particularly suitable for use in a device that is supposed to accept coins of different sizes and different currencies.
- the moment of inertia I of the coin M depends on the type and number of alloys from which the coin M is formed. If the coin M consists of several alloys, the moment of inertia I also depends on the geometric arrangement of the different alloys within the coin M. The ratio of the moment of inertia to the mass I / m is therefore another variable that characterizes the coin M. If the coin M rolls in the coin channel without sliding, the ratio I / m can be used as a decision criterion for accepting or rejecting the coin M, which makes it unnecessary to install an inductive sensor for determining the alloy composition in the coin validator.
- the device can also have other sensors for measuring other properties such as the thickness of the coins to be checked, which then also serve as a decision criterion for the acceptance or rejection of the coin M.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Coins (AREA)
- Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Adornments (AREA)
- Labeling Devices (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
Die Erfindung betrifft eine Einrichtung zur Prüfung der Echtheit von Münzen oder anderen flachen Gegenständen der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a device for checking the authenticity of coins or other flat objects of the type mentioned in the preamble of claim 1.
Solche Münzprüfer eignen sich beispielsweise für die Identifizierung von Münzen bei Telefonapparaten, Verkaufsautomaten, Zählern zur Messung von Energie etc.Such coin validators are suitable, for example, for the identification of coins in telephone sets, vending machines, counters for measuring energy, etc.
Ein Münzprüfer der im Oberbegriff des Anspruchs 1 genannten Art ist bekannt aus der US 4 509 633. Die Sehnenlänge einer Münze wird mittels zweier Lichtschranken bestimmt, indem aus den Zeitdauern, während denen die Münze die erste bzw. die zweite Lichtschranke passiert, eine Durchschnittsgeschwindigkeit der Münze ermittelt und mit dieser Durchschnittsgeschwindigkeit und der Zeitdauer, während der die Münze beide Lichtschranken abdeckt, ein Näherungswert für die Sehnenlänge der Münze berechnet wird. Dieser Näherungswert ist abhängig von der Anfangsgeschwindigkeit der Münze wie auch von der Beschleunigung der Münze.A coin validator of the type mentioned in the preamble of claim 1 is known from US 4,509,633. The chord length of a coin is determined by means of two light barriers by an average speed of the time periods during which the coin passes the first and the second light barrier The coin is determined and an approximate value for the chord length of the coin is calculated using this average speed and the length of time during which the coin covers both light barriers. This approximation depends on the initial speed of the coin as well as the acceleration of the coin.
Aus der US 4 474 281 ist ein Münzprüfer bekannt, bei dem die Münze im freien Fall durch zwei Lichtschranken fällt. Die Wegstrecke vor den Lichtschranken muss wenigstens 2,54 cm (1 Zoll) betragen, da sonst Korrekturfaktoren zur Minimierung des Einflusses der Beschleunigung eingeführt werden müssten.A coin validator is known from US Pat. No. 4,474,281, in which the coin falls through two light barriers in free fall. The distance in front of the light barriers must be at least 2.54 cm (1 inch), otherwise correction factors would have to be introduced to minimize the influence of the acceleration.
Aus der CA 1 206 618 ist ein Münzprüfer bekannt, bei dem mindestens drei Lichtschranken zur Messung der Sehnenlänge der Münze vorgesehen sind. Zur Korrektur der durch die Beschleunigung verursachten Geschwindigkeitsänderung ist ein Beschleunigungsfaktor vorgesehen, der eine Funktion der gemessenen Zeitintervalle ist. Bei einer Veränderung der Schiefe des Münzkanals muss dieser Faktor experimentell neu bestimmt werden.A coin validator is known from CA 1 206 618, in which at least three light barriers are provided for measuring the chord length of the coin. To correct the change in speed caused by the acceleration, an acceleration factor is provided which is a function of the measured time intervals. If the inclination of the coin channel changes, this factor must be redetermined experimentally.
Aus der FR 1'605'182 ist ein weiterer Münzprüfer bekannt. Entlang eines Münzkanals sind zwei Lichtschranken vorgesehen, wobei die Zeitspanne, welche eine Münze benötigt, um von der ersten Lichtschranke zur zweiten Lichtschranke zu gelangen, und die Zeitspanne, während der die Münze die zweite Lichtschranke abdeckt, mit vorgegebenen Referenzwerten verglichen werden. Eine solche Messung stellt implizit eine Ermittlung einer Sehnenlänge der Münze dar. Zur Vermeidung unterschiedlicher Anfangsgeschwindigkeiten ist eine von einem Relais betätigbare Klinke nötig, welche die eingeworfene Münze stoppt und anschliessend den Münzkanal für die Münze freigibt.Another coin validator is known from FR 1'605'182. Two light barriers are provided along a coin channel, the time span that a coin needs to get from the first light barrier to the second light barrier and the time span during which the coin covers the second light barrier are compared with predetermined reference values. Such a measurement implicitly represents a determination of a chord length of the coin. To avoid different initial speeds, a pawl which can be actuated by a relay is necessary, which stops the inserted coin and then releases the coin channel for the coin.
Aus der DE 2'015'058 C2 ist ein Münzprüfer bekannt, bei der eine Klinke zur Freigabe des Münzkanals, ein die Münze je nach ihren spezifischen Eigenschaften abbremsender Magnet sowie zwei Lichtschranken zur Bestimmung der Geschwindigkeit der Münze nach dem Passieren des Magneten vorhanden sind. Eine Berücksichtigung der Beschleunigung der Münze auf dem Weg von der ersten zur zweiten Lichtschranke ist nicht vorgesehen. Zur weiteren Erhöhung der Zuverlässigkeit der Münzendetektion sind zwei weitere Lichtschranken vor dem Bremsmagneten vorgesehen, mit welchen die Geschwindigkeit der Münze vor dem Eintritt ins Magnetfeld des Magneten bestimmbar ist.From DE 2'015'058 C2 a coin validator is known in which there is a pawl for opening the coin channel, a magnet braking the coin depending on its specific properties and two light barriers for determining the speed of the coin after passing the magnet. Taking into account the acceleration of the coin on the way from the first to the second light barrier is not provided. To further increase the reliability of the coin detection, two further light barriers are provided in front of the brake magnet, with which the speed of the coin can be determined before it enters the magnetic field of the magnet.
Aus der EP 119'936 A1 ist ein Münzprüfer bekannt zur Bestimmung des Durchmessers einer Münze mittels zweier Lichtschranken. Die Münze rollt entlang eines Münzkanals und unterliegt dabei einer konstanten Beschleunigung. Aus den Zeitspannen, während derer die Münze die beiden Lichtschranken bedeckt, wird eine mittlere Geschwindigkeit berechnet und zur Korrektur des Einflusses der Beschleunigung auf die Bestimmung des Durchmessers verwendet.EP 119,936 A1 discloses a coin validator for determining the diameter of a coin by means of two light barriers. The coin rolls along a coin channel and is subject to constant acceleration. An average speed is calculated from the time periods during which the coin covers the two light barriers and is used to correct the influence of the acceleration on the determination of the diameter.
Aus der EP 483 451 A1 ist es bekannt, das arithmetische Mittel der Zeiten, während denen eine entlang eines Münzkanals rollende Münze zwei Lichtschranken bedeckt, zur Bestimmung der Sehnenlänge der Münze heranzuziehen.From EP 483 451 A1 it is known to use the arithmetic mean of the times during which a coin rolling along a coin channel covers two light barriers to determine the chord length of the coin.
Der Erfindung liegt die Aufgabe zugrunde, einen Münzprüfer vorzuschlagen, bei dem die Sehnenlänge einer zu prüfenden Münze unabhängig von Anfangsbedingungen auf einfache und genaue Weise bestimmbar ist.The invention is based on the object of proposing a coin validator in which the chord length of a coin to be tested can be determined in a simple and precise manner regardless of initial conditions.
Die genannte Aufgabe wird erfindungsgemäss gelöst durch die Merkmale des Anspruchs 1.According to the invention, the stated object is achieved by the features of claim 1.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der einzigen Figur der Zeichnung näher erläutert. Die Figur zeigt eine Einrichtung zur Prüfung der Echtheit von Münzen oder Jetons oder anderen flachen Gegenständen. Die Einrichtung weist in an sich bekannter Weise einen Münzkanal K, zwei Lichtschranken L1 und L2 sowie elektronische Mittel E zur Erfassung und Auswertung der von den Lichtschranken L1 und L2 abgegebenen elektrischen Signale auf. Im Bereich vom Münzeinlass bis zur ersten Lichtschranke L1 ist der Münzkanal K so ausgebildet und mit energieabsorbierenden Elementen versehen, dass ein Hüpfen oder Springen der Münze M zwischen den beiden Lichtschranken L1 und L2 im Normalfall ausgeschlossen ist. Im Bereich zwischen den beiden Lichtschranken L1 und L2 ist der Münzkanal K als schiefe Ebene SE ausgebildet, die gegenüber der Horizontalen H um den Winkel Θ geneigt ist. Auf der schiefen Ebene SE zwischen den beiden Lichtschranken L1 und L2 bewegt sich die Münze M nun bei konstanter Beschleunigung hinab, die sich als Folge der Gravitationskraft und von Reibungskräften einstellt. Die Bewegung kann ein Rollen ohne Gleiten, ein Gleiten ohne Rollen oder eine Kombination von Rollen und Gleiten sein. Die Lichtschranken L1 und L2 sind oberhalb der schiefen Ebene SE auf einer vorbestimmten, gleichen Höhe h und in einem gegenseitig vorbestimmten Abstand L angeordnet. Die von der Münze M auf der Ebene SE zur Zeit t zurückgelegte Wegstrecke ist mit der Koordinate x(t) bezeichnet. Die Nullpunkte x0 und t0 der Koordinatenachse x und der Zeit t sind so gewählt, dass x0 = 0 bzw. t0 = 0 ist, wenn die Münze M beginnt, die erste Lichtschranke L1 abzudecken.An exemplary embodiment of the invention is explained in more detail below with reference to the single figure of the drawing. The figure shows a device for checking the authenticity of coins or tokens or other flat objects. In a manner known per se, the device has a coin channel K, two light barriers L1 and L2 and electronic means E for detecting and evaluating the electrical signals emitted by the light barriers L1 and L2. In the area from the coin inlet to the first light barrier L1, the coin channel K is designed and provided with energy-absorbing elements in such a way that a jumping or jumping of the coin M between the two light barriers L1 and L2 is normally impossible. In the area between the two light barriers L1 and L2, the coin channel K is designed as an inclined plane SE, which is inclined by the angle Θ with respect to the horizontal H. On the inclined plane SE between the two light barriers L1 and L2, the coin M now moves down with constant acceleration, which arises as a result of the gravitational force and frictional forces. The movement can be rolling without sliding, sliding without rolling, or a combination of rolling and sliding. The light barriers L1 and L2 are arranged above the inclined plane SE at a predetermined, identical height h and at a mutually predetermined distance L. The distance traveled by the coin M on the level SE at time t is designated by the coordinate x (t). The zero points x 0 and t 0 of the coordinate axis x and the time t are chosen such that x 0 = 0 and t 0 = 0, respectively, when the coin M begins to cover the first light barrier L1.
Die Münze M weist eine Masse m, einen Radius R und ein Trägheitsmoment I auf. Das Trägheitsmoment I ist bezogen auf die durch den Schwerpunkt der Münze M führende Drehachse. Für eine homogene Münze gilt bekanntlich I=½mR2. Die Länge der parallel zur schiefen Ebene SE verlaufenden Sehne der Münze M auf der Höhe h ist mit B bezeichnet. Der Schwerpunkt der Münze M bewegt sich mit der Geschwindigkeit v(t). Die Drehung der Münze M um ihren Schwerpunkt erfolgt mit der Winkelgeschwindigkeit ω(t). Die Energie E der Münze M setzt sich zusammen aus potentieller Energie Epot, kinetischer Energie Ekin des Schwerpunktes und Rotationsenergie Erot bezüglich ihres Schwerpunktes:
Zum Zeitpunkt t0 = 0 hat die Geschwindigkeit v der Münze M den Wert v0, ihre Winkelgeschwindigkeit ω den Wert ω0, so dass gilt
Aus dem Gesetz der Energieerhaltung ergibt sich die Gleichung
Für den Fall, dass die Münze rollt, ohne zu gleiten, gilt v = Rω. Durch Differentiation der Gleichung (3) nach der Zeit t erhält man somit eine konstante Beschleunigung a1
Durch Integration ergibt sich
Beim Rollen entlang des Münzkanals deckt die Münze M nacheinander die beiden Lichtschranken L1 und L2 ab. Es bezeichnen die Zeitpunkte t1 das Ende des Abdeckens der ersten Lichtschranke L1, t2 den Beginn des Abdeckens der zweiten Lichtschranke L2 und t3 das Ende des Abdeckens der zweiten Lichtschranke L2, so dass sich folgende Gleichungen (6), (7), (8) ergeben
Durch Auflösung dieses Gleichungssystems (6), (7), (8) erhält man
Die Formel (9) zur Bestimmung der Sehnenlänge B der Münze M enthält keinerlei Terme, die von ihrer Anfangsgeschwindigkeit v0, ihrer anfänglichen Winkelgeschwindigkeit ω0 oder von irgendwelchen physikalischen Konstanten abhängen. Die Sehnenlänge B ergibt sich allein aus dem vorbestimmten Abstand L der beiden Lichtschranken L1 und L2 und den zu messenden Zeitpunkten t1, t2 und t3, wobei die Zeitachse so zu wählen ist, dass t0 = 0 gilt. Die Zeitpunkte t1, t2 und t3 entsprechen somit eigentlich Zeitdifferenzen. Der Radius R der Münze M ist aus der Sehnenlänge B und der Höhe h berechenbar zu
Mit der Formel (10) lässt sich die Beschleunigung der Münze M ebenfalls aus den Zeitpunkten t1, t2 und t3 berechnen. Unter der Voraussetzung, dass die Münze M rollt ohne zu gleiten, ist mittels der Formeln (4), (10) und (11) das Verhältnis von Trägheitsmoment I zu Masse m der Münze M bestimmbar:
Für den Fall, dass die Münze M gleitet ohne zu rollen, verschwindet ihre Rotationsenergie und es ergibt sich ebenfalls eine konstante Beschleunigung a2
Wie leicht zu sehen ist, ist die Bestimmung der Sehnenlänge B nach wie vor mittels der Formel (9) aus den Zeitpunkten t1, t2 und t3 bestimmbar. Die Formel (9) zur Bestimmung der Sehnenlänge B ist weiter auch gültig für den Fall, dass die Münze M rollt und gleitet, unter der Voraussetzung, dass die Beschleunigung a ihres Schwerpunktes vom Zeitpunkt t0 bis zum Zeitpunkt t3 annähernd konstant ist, das ist auf der Strecke zwischen den beiden Lichtschranken L1 und L2.As can easily be seen, the determination of the chord length B can still be determined from the times t 1 , t 2 and t 3 using the formula (9). The formula (9) for determining the chord length B is also valid for the case that the coin M rolls and slides, provided that the acceleration a of its center of gravity is approximately constant from time t 0 to time t 3 , that is on the route between the two light barriers L1 and L2.
Die Messung der Zeitpunkte t0, t1, t2 und t3 kann mit an sich bekannten Methoden mit hoher Genauigkeit erfolgen. Bei einer ersten Ausführung der Einrichtung zur Prüfung von Münzen sind die von den Lichtschranken L1 und L2 abgegebenen Signale auf getrennten Leitungen auf zwei Eingänge eines Mikroprozessors zugeführt, so dass der Abstand L der beiden Lichtschranken L1 und L2 beliebig festlegbar ist. Bei einer vorteilhaften Ausführung ist der Abstand L grösser als die Sehne B der grössten zu messenden Münze gewählt. Dann sind die beiden Lichtschranken L1 und L2 nie gleichzeitig abgedeckt, so dass die Ausgangssignale beider Lichtschranken L1 und L2 einem gemeinsamen Eingang des Mikroprozessors zuführbar sind. Bei der Passage einer Münze M an den Lichtschranken L1 und L2 vorbei treffen beim Mikroprozessor bei beiden Ausführungen nacheinander zwei Impulse ein. Die Anstiegsflanke des ersten Impulses startet beim Mikroprozessor eine Zeitmessung, setzt also t0 = 0. Die anderen drei Flanken der beiden Impulse bestimmen dann die drei Zeitpunkte t1, t2 und t3. Mittels der Formel (9) berechnet der Mikroprozessor anschliessend die Sehnenlänge B der Münze M, welche als wenigstens ein Entscheidungskriterium über die Annahme oder Zurückweisung der Münze M dient.The times t 0 , t 1 , t 2 and t 3 can be measured with methods known per se with high accuracy. In a first embodiment of the device for checking coins, the signals emitted by the light barriers L1 and L2 are fed on separate lines to two inputs of a microprocessor, so that the distance L between the two light barriers L1 and L2 can be set as desired. In an advantageous embodiment, the distance L is chosen to be larger than the chord B of the largest coin to be measured. Then the two light barriers L1 and L2 are never covered at the same time, so that the output signals of both light barriers L1 and L2 can be fed to a common input of the microprocessor. When a coin M passes the light barriers L1 and L2, the microprocessor receives two pulses one after the other in both versions. The rising edge of the first pulse starts a time measurement in the microprocessor, ie sets t 0 = 0. The other three edges of the two pulses then determine the three times t 1 , t 2 and t 3 . Using the formula (9), the microprocessor then calculates the chord length B of the coin M, which serves as at least one decision criterion for accepting or rejecting the coin M.
Die angegebenen Formeln können natürlich umgeformt werden oder allenfalls sogar durch eine Näherungsformel ersetzt werden, so dass bei der Durchführung der Berechnung mittels eines Mikroprozessors Rundungsfehler möglichst vermeidbar sind.The specified formulas can of course be transformed or, if necessary, even replaced by an approximate formula, so that rounding errors can be avoided as far as possible when performing the calculation using a microprocessor.
Der Vorteil der beschriebenen Einrichtung ist darin zu sehen, dass weder die Anfangsgeschwindigkeit v0 noch die anfängliche Winkelgeschwindigkeit noch die effektive Beschleunigung a der Münze M auf ihrem Weg von der ersten zur zweiten Lichtschranke in die Bestimmung der Sehnenlänge B eingehen. Eine mittels beispielsweise eines Magneten betätigbare Stoppvorrichtung im Münzkanal vor der ersten Lichtschranke Ll ist nicht erforderlich. Die Sehnenlänge B einer Münze M ist mit der Formel (9) mit einer Genauigkeit bestimmbar, die im Promillebereich liegt. Der vorgeschlagene Münzprüfer eignet sich deshalb vorzüglich zur Verwendung in einem Gerät, das Münzen unterschiedlicher Grösse und verschiedener Währungen annehmen soll.The advantage of the device described can be seen in the fact that neither the initial speed v 0 nor the initial angular speed go into the effective acceleration a of the coin M on its way from the first to the second light barrier in determining the chord length B. A stop device which can be actuated by means of a magnet, for example, in the coin channel in front of the first light barrier L1 is not required. The chord length B of a coin M is of the formula (9) with a Accuracy can be determined, which is in the alcohol range. The proposed coin validator is therefore particularly suitable for use in a device that is supposed to accept coins of different sizes and different currencies.
Das Trägheitsmoment I der Münze M hängt ab von Art und Anzahl der Legierungen, aus denen die Münze M gebildet ist. Falls die Münze M aus mehreren Legierungen besteht, hängt das Trägheitsmoment I auch von der geometrischen Anordnung der verschiedenen Legierungen innerhalb der Münze M ab. Das Verhältnis von Trägheitsmoment und Masse I/m ist deshalb eine weitere, die Münze M charakterisierende Grösse. Falls die Münze M im Münzkanal rollt ohne zu gleiten, ist das Verhältnis I/m als Entscheidungskriterium über die Annahme oder Zurückweisung der Münze M verwendbar, wodurch sich der Einbau eines induktiven Sensors zur Bestimmung der Legierungszusammensetzung in den Münzprüfer erübrigt.The moment of inertia I of the coin M depends on the type and number of alloys from which the coin M is formed. If the coin M consists of several alloys, the moment of inertia I also depends on the geometric arrangement of the different alloys within the coin M. The ratio of the moment of inertia to the mass I / m is therefore another variable that characterizes the coin M. If the coin M rolls in the coin channel without sliding, the ratio I / m can be used as a decision criterion for accepting or rejecting the coin M, which makes it unnecessary to install an inductive sensor for determining the alloy composition in the coin validator.
Die Einrichtung kann auch weitere Sensoren aufweisen zur Messung anderer Eigenschaften wie z.B. der Dicke der zu prüfenden Münzen, welche dann ebenfalls als Entscheidungskriterium über die Annahme oder Zurückweisung der Münze M dienen.The device can also have other sensors for measuring other properties such as the thickness of the coins to be checked, which then also serve as a decision criterion for the acceptance or rejection of the coin M.
Claims (7)
- A device for testing the authenticity of coins (M), tokens or other flat objects, having a coin passage (K) and electronic means (E), in which the coin (M) to be tested, on a path which is inclined through an angle e relative to the horizontal (H), passes two light barriers (L1, L2) which are arranged at the sane height h relative to the path and which are at a mutual spacing L, the electronic means (E) detecting the signals outputted by the light barriers (L1, L2) when the coin (M) passes and determining therefrom the chord length B which serves as a decision criterion for accepting or rejecting the coin (M), characterised in that the electronic means (E) detect the time t0 of the beginning of masking of the first light barrier (L1), the time t1 of the end of masking of the first light barrier (L1), the time t2 of the beginning of masking of the second light barrier (L2) and the time t3 of the end of masking of the second light barrier (L2) and calculate the chord length B of the coin (M) from those four times t0, t1, t2, t3 in accordance with the physical laws of motion which apply for the inclined path, wherein it is presupposed for the laws of motion that the coin (M) is subject to an approximately constant acceleration a from the time t0 of the beginning of masking of the first light barrier (L1) to the time t3 of the end of masking of the second light barrier (L2).
- A device according to claim 1 or claim 2 characterised in that the acceleration a is determined and serves as the decision criterion for accepting or rejecting the coin (M).
- A device according to one of claims 1 to 4 characterised in that the ratio of the moment of inertia I and the mass m of the coin (M) is determined and serves as the decision criterion for accepting or rejecting the coin (M).
- A device for testing coins (M) according to one of claims 1 to 6 characterised in that it accepts coins (M) of different currencies.
Priority Applications (15)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94111909A EP0694888B1 (en) | 1994-07-29 | 1994-07-29 | Device for testing coins or other flat objects |
AT94111909T ATE144335T1 (en) | 1994-07-29 | 1994-07-29 | DEVICE FOR TESTING COINS OR FLAT OBJECTS |
DK94111909.1T DK0694888T3 (en) | 1994-07-29 | 1994-07-29 | Device for checking coins or flat objects |
ES94111909T ES2093478T3 (en) | 1994-07-29 | 1994-07-29 | DEVICE TO EXAMINE COINS OR FLAT OBJECTS. |
DE59400864T DE59400864D1 (en) | 1994-07-29 | 1994-07-29 | Device for checking coins or flat objects |
TW083107903A TW262551B (en) | 1994-07-29 | 1994-08-29 | Device for the testing of coins or flat articles |
LT95-067A LT4004B (en) | 1994-07-29 | 1995-06-13 | Method for the testing of coins or flat articles |
CN95109938.8A CN1120709A (en) | 1994-07-29 | 1995-07-07 | Device for the testing of coins or flat articles |
PL95309771A PL309771A1 (en) | 1994-07-29 | 1995-07-26 | Apparatus for inspecting coins and other flat objects |
SK948-95A SK94895A3 (en) | 1994-07-29 | 1995-07-27 | Device for testing of coins or flat objects |
EE9500038A EE03009B1 (en) | 1994-07-29 | 1995-07-27 | Coin and other flat object control device or tester |
BR9503487A BR9503487A (en) | 1994-07-29 | 1995-07-28 | Installation for examining coins or flat objects |
FI953625A FI953625A (en) | 1994-07-29 | 1995-07-28 | Device for testing coins or flat objects |
NO953004A NO953004L (en) | 1994-07-29 | 1995-07-28 | Device for examining coins or flat objects |
GR960402915T GR3021541T3 (en) | 1994-07-29 | 1996-11-06 | Device for testing coins or other flat objects |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94111909A EP0694888B1 (en) | 1994-07-29 | 1994-07-29 | Device for testing coins or other flat objects |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0694888A1 EP0694888A1 (en) | 1996-01-31 |
EP0694888B1 true EP0694888B1 (en) | 1996-10-16 |
Family
ID=8216160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94111909A Revoked EP0694888B1 (en) | 1994-07-29 | 1994-07-29 | Device for testing coins or other flat objects |
Country Status (15)
Country | Link |
---|---|
EP (1) | EP0694888B1 (en) |
CN (1) | CN1120709A (en) |
AT (1) | ATE144335T1 (en) |
BR (1) | BR9503487A (en) |
DE (1) | DE59400864D1 (en) |
DK (1) | DK0694888T3 (en) |
EE (1) | EE03009B1 (en) |
ES (1) | ES2093478T3 (en) |
FI (1) | FI953625A (en) |
GR (1) | GR3021541T3 (en) |
LT (1) | LT4004B (en) |
NO (1) | NO953004L (en) |
PL (1) | PL309771A1 (en) |
SK (1) | SK94895A3 (en) |
TW (1) | TW262551B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH690801A5 (en) * | 1996-07-11 | 2001-01-15 | Ip Tpg Holdco Sarl | Means for testing the authenticity of coins, tokens or other flat metallic objects. |
ES2127150B1 (en) * | 1997-07-29 | 1999-11-16 | Azkoyen Ind Sa | METHOD FOR THE IDENTIFICATION OF DISCOIDAL METAL PARTS WITH A CENTRAL HOLE. |
ES2380484B1 (en) * | 2002-08-22 | 2013-04-01 | Azkoyen , S.A. | COIN SELECTOR DEVICE AND METHOD |
DE102008059310A1 (en) * | 2008-11-27 | 2010-06-02 | National Rejectors, Inc. Gmbh | Method and apparatus for determining the diameter of coins in a free fall coin device |
DE102012014958A1 (en) | 2012-07-30 | 2014-02-13 | Crane Payment Solutions Gmbh | Coin and method for checking the coin |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1246622A (en) | 1967-07-17 | 1971-09-15 | Mars Inc | Coin or token testing system |
DE2015058C2 (en) | 1969-04-01 | 1983-12-08 | Mars Inc., Washington, D.C. | Device for checking coins |
US4474281A (en) * | 1982-06-07 | 1984-10-02 | General Signal Corporation | Apparatus and method for coin diameter computation |
FR2541019B1 (en) | 1983-02-10 | 1986-07-18 | Mecelec Sa | OPTICAL METHOD FOR DETERMINING THE DIMENSIONS OF A RELATIVE MOVING OBJECT, AND MORE PARTICULARLY A COIN IN A PRE-PAYMENT APPARATUS, AND DEVICE FOR IMPLEMENTING IT |
CA1206618A (en) * | 1983-02-25 | 1986-06-24 | J. Randall Macdonald | Electronic coin measurement apparatus |
US4509633A (en) * | 1983-08-24 | 1985-04-09 | Reed Industries, Inc. | Electronic coin validator with improved diameter sensing apparatus |
US4646904A (en) * | 1985-09-05 | 1987-03-03 | Coin Acceptors, Inc. | Coin sizing means and method |
IT1243886B (en) | 1990-11-02 | 1994-06-28 | Marconi Italiana Automazione E | METHOD AND EQUIPMENT FOR THE IDENTIFICATION OF COINS. |
-
1994
- 1994-07-29 ES ES94111909T patent/ES2093478T3/en not_active Expired - Lifetime
- 1994-07-29 DE DE59400864T patent/DE59400864D1/en not_active Revoked
- 1994-07-29 AT AT94111909T patent/ATE144335T1/en not_active IP Right Cessation
- 1994-07-29 EP EP94111909A patent/EP0694888B1/en not_active Revoked
- 1994-07-29 DK DK94111909.1T patent/DK0694888T3/en active
- 1994-08-29 TW TW083107903A patent/TW262551B/en active
-
1995
- 1995-06-13 LT LT95-067A patent/LT4004B/en not_active IP Right Cessation
- 1995-07-07 CN CN95109938.8A patent/CN1120709A/en active Pending
- 1995-07-26 PL PL95309771A patent/PL309771A1/en unknown
- 1995-07-27 SK SK948-95A patent/SK94895A3/en unknown
- 1995-07-27 EE EE9500038A patent/EE03009B1/en unknown
- 1995-07-28 NO NO953004A patent/NO953004L/en unknown
- 1995-07-28 FI FI953625A patent/FI953625A/en unknown
- 1995-07-28 BR BR9503487A patent/BR9503487A/en not_active Application Discontinuation
-
1996
- 1996-11-06 GR GR960402915T patent/GR3021541T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE59400864D1 (en) | 1996-11-21 |
ATE144335T1 (en) | 1996-11-15 |
NO953004D0 (en) | 1995-07-28 |
PL309771A1 (en) | 1996-02-05 |
GR3021541T3 (en) | 1997-02-28 |
FI953625A0 (en) | 1995-07-28 |
TW262551B (en) | 1995-11-11 |
LT4004B (en) | 1996-07-25 |
FI953625A (en) | 1996-01-30 |
EE03009B1 (en) | 1997-06-16 |
EP0694888A1 (en) | 1996-01-31 |
ES2093478T3 (en) | 1996-12-16 |
BR9503487A (en) | 1996-06-04 |
NO953004L (en) | 1996-01-30 |
SK94895A3 (en) | 1996-02-07 |
CN1120709A (en) | 1996-04-17 |
LT95067A (en) | 1996-04-25 |
DK0694888T3 (en) | 1997-03-24 |
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