EP0888595B1 - Coin-checking arrangement - Google Patents

Coin-checking arrangement Download PDF

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Publication number
EP0888595B1
EP0888595B1 EP97915378A EP97915378A EP0888595B1 EP 0888595 B1 EP0888595 B1 EP 0888595B1 EP 97915378 A EP97915378 A EP 97915378A EP 97915378 A EP97915378 A EP 97915378A EP 0888595 B1 EP0888595 B1 EP 0888595B1
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EP
European Patent Office
Prior art keywords
coin
coil
side wall
coins
arrangement
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EP97915378A
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German (de)
French (fr)
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EP0888595A1 (en
Inventor
Thomas Seitz
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IPM INTERNATIONAL SA
Deutsche Telekom AG
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Electrowatt Technology Innovation AG
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Priority to SI9730011T priority Critical patent/SI0888595T1/en
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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
    • 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
    • G07D5/08—Testing the magnetic or electric properties

Definitions

  • the invention relates to an arrangement for checking coins according to the preamble of claim 1.
  • the arrangement is used in coin validators of vending and service machines, such as e.g. B. telephone stations, drinks or cigarette machines, etc.
  • the coins often have one sandwich-like structure, whose layers of differently alloyed, nickel-containing metals, e.g. B. CuNi and Ni exist.
  • the invention has for its object to improve the known arrangement so that at least the combinatorial effect of the coin thickness and a sandwich structure of the Detectable coin and inner coin layers with 4%, 6% and 8% nickel in an environment of CuNi are recognizable, which allows a clear identification of the coin concerned.
  • An arrangement for checking coins 1 has a coin channel 2, along which in the Direction of movement of the coins 1 several coils are arranged one behind the other.
  • the coil 4 is used for the determination the thickness of the coins 1 to be checked and preferably consists of a first coil half 4a and a second coil half 4b, both in the opposite phase in the arrangement according to the invention are electrically connected in series (see FIG. 4) and each have a ferromagnetic core 4c or 4d exhibit.
  • the coil 4 is part of a resonant circuit, not shown, of a Power source is fed with an alternating current, which is an alternating magnetic field in the ferromagnetic cores 4c and 4d of the coil halves 4a and 4b generated.
  • the coil 3 serves on the other hand, the determination of the alloy composition of the coins to be checked 1 and is open arranged on the same side of the coin channel 2 as the coil half 4b.
  • the coil 3 is part of a resonance resonant circuit, not shown, which is from a current source with a Alternating current is fed, which is an alternating magnetic field in a ferromagnetic core 3a Coil 3 generated.
  • the coin channel 2 has a bottom surface 5 and serving as an inclined plane at least one side wall 6.
  • the two coil halves 4a and 4b are arranged opposite each other on both sides of the coin channel 2, their axes run perpendicular to the side wall 6.
  • the coins 1 move in the arrangement during checking along the side wall 6 of the coin channel 2 and thereby on the two coil halves 4a and 4b the coil 4 over, between which they thus move past.
  • the coil half 4b is located in the side wall 6, d. H. in the side wall along which the coins 1 move while the coil half 4a in the opposite other side wall 7th located.
  • the coil half 4b like the side wall 6, is independent of the coin thickness constantly an equal, perpendicular to the side wall 6 measured distance to the coin 1 and provides therefore no contribution to the measurement of this coin thickness.
  • the latter is exclusively through the Coil half 4a determined, whose distance from the coin 1 measured perpendicular to the side wall 6 the coin thickness is dependent. That is, by moving the metallic coin in the same eddy currents caused by inductive reaction on the coil 4 Change ⁇ R of the resistance R of the coil half 4a, which change is a measure of the Coin thickness is.
  • the measuring sensitivity deteriorates less if the coil half 4b with the resistance R ', which is located on the same side of the coin channel 2 as the side wall 6, while maintaining the number of turns and the alternating magnetic field value, is lower-resistance than the other coil half 4a with the resistance R.
  • the measuring sensitivity S ⁇ R / [R + R '] with R' is less than R, whereby R 'should be as small as possible compared to R in order to achieve a minimal deterioration.
  • the measurement sensitivity S is thus noticeably better if the lower-resistance coil half 4b is wound with a stranded wire, while the coil half 4a continues to be conventional, e.g. B.
  • R AC is significantly larger than R DC .
  • R AC is practically no current displacement in its current conductor, so that R AC ⁇ 0 and the resistance R 'are practically reduced to the DC component R DC .
  • R ' ⁇ R DC R / 5.
  • the measured value of ⁇ R is a combinatorial function of the coin thickness and the sandwich-like alloy composition of the coin 1. It thus gives an equation two unknowns, namely the coin thickness and the alloy composition. In many Knowing the authenticity and the value of the coin 1 is sufficient in cases combinatorial effect of coin 1, d. H. the determination of ⁇ R. If so, however is insufficient, the alloy composition of the Coin 1 can be determined. This yields a second equation, so a total of two equations there are two unknowns, the solution of which gives separate values of the two unknowns, namely the thickness and the alloy composition of the coin 1, both values for the Authenticity and the value of coin 1 are characteristic.

Abstract

PCT No. PCT/EP97/01342 Sec. 371 Date Sep. 10, 1998 Sec. 102(e) Date Sep. 10, 1998 PCT Filed Mar. 18, 1997 PCT Pub. No. WO97/35286 PCT Pub. Date Sep. 25, 1997An arrangement for checking coins wherein the coins (1) move in the checking operation along a side wall (6) of a coin passage (2) and past two coil halves (4a, 4b) which are disposed opposite each other on both sides of the coin passage (2) and which are connected in series in phase opposition. The coin half (4b) which is disposed on the same side of the coin passage (2) as the side wall (6) is of lower resistance than the other coin half (4a) and preferably comprises stranded wire.

Description

Die Erfindung bezieht sich auf eine Anordnung zum Prüfen von Münzen gemäss dem Oberbegriff des Anspruchs 1.The invention relates to an arrangement for checking coins according to the preamble of claim 1.

Die Anordnung wird in Münzprüfem von Verkaufs- und Dienstleistungsautomaten verwendet, wie z. B. Telephonstationen, Getränke- oder Zigaretten-Automaten, usw. Die Münzen besitzen oft einen sandwichförmigen Aufbau, dessen Schichten aus unterschiedlich legierten, nickelhaltigen Metallen, z. B. CuNi und Ni, bestehen.The arrangement is used in coin validators of vending and service machines, such as e.g. B. telephone stations, drinks or cigarette machines, etc. The coins often have one sandwich-like structure, whose layers of differently alloyed, nickel-containing metals, e.g. B. CuNi and Ni exist.

Eine Anordnung der eingangs genannten Art ist aus der EP 0 304 535 A1 bekannt, in der eine Anordnung zum Prüfen von Münzen beschrieben ist, in der eine erste Spule die Legierung und eine zweite Spule die Dicke der Münze ermittelt, wobei die zweite Spule aus zwei Spulenhälften besteht, die in Gegenphase oder Gleichphase elektrisch in Reihe oder parallel geschaltet sind. Die beiden Spulen sind jeweils ein Teil eines eigenen Resonanz-Schwingungskreises, der von einer Stromquelle mit einem Wechselstrom gespeist ist.An arrangement of the type mentioned at the outset is known from EP 0 304 535 A1, in which one Arrangement for checking coins is described, in which a first coil the alloy and a second coil determines the thickness of the coin, the second coil consisting of two coil halves, which are electrically connected in series or in parallel in opposite phase or in phase. The two Coils are each part of a separate resonant circuit, which is from a power source is fed with an alternating current.

Der Erfindung liegt die Aufgabe zugrunde, die bekannte Anordnung so zu verbessern, dass mindestens die kombinatorische Wirkung der Münzdicke und eines sandwichförmigen Aufbaus der Münze ermittelbar und innere Münzschichten mit 4%, 6% und 8% Nickel in einer Umgebung von CuNi erkennbar sind, was eine eindeutige Identifizierung der betreffenden Münze gestattet.The invention has for its object to improve the known arrangement so that at least the combinatorial effect of the coin thickness and a sandwich structure of the Detectable coin and inner coin layers with 4%, 6% and 8% nickel in an environment of CuNi are recognizable, which allows a clear identification of the coin concerned.

Die genannte Aufgabe wird erfindungsgemäss durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst. Eine vorteilhafte Ausgestaltung der Erfindung ergibt sich aus dem abhängigen Anspruch.According to the invention, this object is achieved by the characterizing part of claim 1 specified features solved. An advantageous embodiment of the invention results from the dependent claim.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below described.

Es zeigen:

Fig. 1
einen schematischen senkrechten Längsschnitt eines Münzkanals,
Fig. 2
einen schematischen Querschnitt des Münzkanals,
Fig. 3
einen schematischen horizontalen Längsschnitt des Münzkanals und
Fig. 4
eine Reihenschaltung in Gegenphase zweier Spulenhälften einer Spule.
Show it:
Fig. 1
a schematic vertical longitudinal section of a coin channel,
Fig. 2
a schematic cross section of the coin channel,
Fig. 3
a schematic horizontal longitudinal section of the coin channel and
Fig. 4
a series connection in the opposite phase of two coil halves of a coil.

Eine Anordnung zum Prüfen von Münzen 1 besitzt einen Münzkanal 2, entlang welchem in der Bewegungsrichtung der Münzen 1 mehrere Spulen hintereinander angeordnet sind. In den Figuren 1 bis 3 gilt die Annahme, dass zwei Spulen 3 und 4 vorhanden sind. Die Spule 4 dient der Ermittlung der Dicke der zu prüfenden Münzen 1 und besteht vorzugsweise aus einer ersten Spulenhälfte 4a und einer zweiten Spulenhälfte 4b, die in der erfindungsgemässen Anordnung beide in Gegenphase elektrisch in Reihe geschaltet sind (siehe Fig. 4) und je einen ferromagnetischen Kern 4c bzw. 4d aufweisen. Die Spule 4 ist ein Teil eines nichtdargestellten Resonanz-Schwingkreises, der von einer Stromquelle mit einem Wechselstrom gespeist ist, der ein Wechselmagnetfeld in die ferromagnetischen Kernen 4c und 4d der Spulenhälften 4a und 4b erzeugt. Die Spule 3 dient dagegen der Ermittlung der Legierungs-Zusammensetzung der zu prüfenden Münzen 1 und ist auf der gleichen Seite des Münzkanals 2 angeordnet wie die Spulenhälfte 4b. Die Spule 3 ist ein Teil eines nichtdargestellten eigenen Resonanz-Schwingkreises, der von einer Stromquelle mit einem Wechselstrom gespeist ist, der ein Wechselmagnetfeld in einen ferromagnetischen Kern 3a der Spule 3 erzeugt. Der Münzkanal 2 weist eine als schräge Ebene dienende Bodenfläche 5 und mindestens eine Seitenwand 6 auf. In den Figuren 1 bis 3 gilt die Annahme, dass zwei parallele Seitenwände 6 und 7 vorhanden sind. Anlässlich einer Münzprüfung rollen oder gleiten die Münzen 1 unter Einfluss der Schwerkraft auf der durch die Bodenfläche 5 gebildete schräge Ebene schräg von oben nach unten und liegen dabei auf der Seitenwand 6 auf, entlang der sie sich somit fortbewegen. Zu diesem Zweck ist die Seitenwand 6 leicht gegenüber der Senkrechten geneigt, so dass unter Einfluss der Schwerkraft die Münzen 1 bei ihrer Fortbewegung auf ihr aufliegen. Zur Verminderung der Reibung ist die Seitenwand 6 in Richtung der Fortbewegung der Münzen 1 vorzugsweise mit vorstehenden Längsrippen versehen, was in der Zeichnung jedoch nicht dargestellt ist. Die Münzen 1 liegen dann anlässlich ihrer Roll- oder Gleitbewegung entlang der schrägen Ebene auf die Längsrippen der Seitenwand 6, so dass ihr Abstand zur Seitenwand 6 immer konstant klein und unabhängig von der Münzdicke bleibt. Die beiden Spulenhälften 4a und 4b sind einander gegenüberliegend auf beiden Seiten des Münzkanals 2 angeordnet, wobei ihre Achsen senkrecht zur Seitenwand 6 verlaufen. Die Münzen 1 bewegen sich beim Prüfen in der Anordnung entlang der Seitenwand 6 des Münzkanals 2 fort und dabei an den beiden Spulenhälften 4a und 4b der Spule 4 vorbei, zwischen denen sie sich somit vorbeibewegen. Die Spulenhälfte 4b befindet sich in der Seitenwand 6, d. h. in derjenigen Seitenwand, entlang welcher sich die Münzen 1 fortbewegen, während die Spulenhälfte 4a sich in der gegenüberliegenden anderen Seitenwand 7 befindet. Die Spulenhälfte 4b genau wie die Seitenwand 6 besitzt unabhängig von der Münzdicke ständig einen gleichen, senkrecht zur Seitenwand 6 gemessenen Abstand zur Münze 1 und leistet daher keinen Beitrag zur Messung dieser Münzdicke. Die letztere wird ausschliesslich durch die Spulenhälfte 4a ermittelt, deren senkrecht zur Seitenwand 6 gemessene Abstand zur Münze 1 von der Münzdicke abhängig ist. D. h. die durch die Vorbeibewegung der metallischen Münze in derselben erzeugten Wirbelströme verursachen durch induktive Rückwirkung auf die Spule 4 eine Änderung ΔR des Widerstandes R der Spulenhälfte 4a, welche Änderung ein Mass für die Münzdicke ist. Bei Abwesenheit der Spulenhälfte 4b ist die Messempfindlichkeit gleich der relativen Widerstandsänderung S = ΔR/R, die erzielbare Auflösung gleich 0,05 mm und das von der Spulenhälfte 4a der Spule 4 erzeugte Wechselmagnetfeld im Münzkanal 2 senkrecht zur Münze 1 ausgerichtet. Die Feldlinien des Wechselmagnetfeldes schliessen sich bei Anwesenheit einer sich vorbeibewegenden nickelhaltigen Münze durch die letztere und es erfolgt kein tiefes Eindringen des Wechselmagnetfeldes in das Innern der Münze 1. Dies ist somit zwar eine gute Anordnung zur Messung des Abstandes der Münze 1 von der Seitenwand 7 und damit zur Messung der Münzdicke, jedoch keine gute Anordnung zur Ermittlung der Legierungs-Zusammensetzung im Innern der Münze 1. Bei Abwesenheit der Spulenhälfte 4b ist nur ein grobes Erkennen des Vorhandenseins von Sandwichschichten innerhalb der Münzen 1 möglich, die z. B. aussen aus CuNi und innen aus Ni bestehen. Eine Ermittlung der Dicke und des Nickelgehaltes der Sandwichschichten sind jedoch mit diesem Aufbau praktisch nicht möglich. Beim Prüfen solcher Münzen ist es jedoch erforderlich, dass innere Münzschichten mit 4%, 6% und 8% Nickel in einer Umgebung von CuNi erkennbar sind, was durch das zusätzliche Vorhandensein der zweiten Spulenhälfte 4b ermöglicht wird.An arrangement for checking coins 1 has a coin channel 2, along which in the Direction of movement of the coins 1 several coils are arranged one behind the other. In Figures 1 to 3 it is assumed that two coils 3 and 4 are present. The coil 4 is used for the determination the thickness of the coins 1 to be checked and preferably consists of a first coil half 4a and a second coil half 4b, both in the opposite phase in the arrangement according to the invention are electrically connected in series (see FIG. 4) and each have a ferromagnetic core 4c or 4d exhibit. The coil 4 is part of a resonant circuit, not shown, of a Power source is fed with an alternating current, which is an alternating magnetic field in the ferromagnetic cores 4c and 4d of the coil halves 4a and 4b generated. The coil 3 serves on the other hand, the determination of the alloy composition of the coins to be checked 1 and is open arranged on the same side of the coin channel 2 as the coil half 4b. The coil 3 is part of a resonance resonant circuit, not shown, which is from a current source with a Alternating current is fed, which is an alternating magnetic field in a ferromagnetic core 3a Coil 3 generated. The coin channel 2 has a bottom surface 5 and serving as an inclined plane at least one side wall 6. In Figures 1 to 3, the assumption applies that two parallel Side walls 6 and 7 are present. The coins roll or slide during a coin check 1 obliquely under the influence of gravity on the inclined plane formed by the base surface 5 from top to bottom and lie on the side wall 6, along which they are thus move. For this purpose, the side wall 6 is slightly inclined to the vertical, so that under the influence of gravity the coins 1 rest on it as they move. For The side wall 6 is reduced in the direction of the movement of the coins 1 preferably provided with protruding longitudinal ribs, but not in the drawing is shown. The coins 1 are then on the occasion of their rolling or sliding movement along the inclined plane on the longitudinal ribs of the side wall 6, so that their distance from the side wall 6 always remains constantly small and independent of the coin thickness. The two coil halves 4a and 4b are arranged opposite each other on both sides of the coin channel 2, their axes run perpendicular to the side wall 6. The coins 1 move in the arrangement during checking along the side wall 6 of the coin channel 2 and thereby on the two coil halves 4a and 4b the coil 4 over, between which they thus move past. The coil half 4b is located in the side wall 6, d. H. in the side wall along which the coins 1 move while the coil half 4a in the opposite other side wall 7th located. The coil half 4b, like the side wall 6, is independent of the coin thickness constantly an equal, perpendicular to the side wall 6 measured distance to the coin 1 and provides therefore no contribution to the measurement of this coin thickness. The latter is exclusively through the Coil half 4a determined, whose distance from the coin 1 measured perpendicular to the side wall 6 the coin thickness is dependent. That is, by moving the metallic coin in the same eddy currents caused by inductive reaction on the coil 4 Change ΔR of the resistance R of the coil half 4a, which change is a measure of the Coin thickness is. In the absence of the coil half 4b, the measurement sensitivity is the same relative resistance change S = ΔR / R, the achievable resolution is 0.05 mm and that of Half of coil 4a of coil 4 generates an alternating magnetic field in coin channel 2 perpendicular to coin 1 aligned. The field lines of the alternating magnetic field close in the presence of one passing nickel-containing coin through the latter and there is no deep penetration of the Alternating magnetic field inside the coin 1. This is therefore a good arrangement for Measuring the distance of the coin 1 from the side wall 7 and thus for measuring the coin thickness, but not a good arrangement for determining the alloy composition inside the Coin 1. In the absence of the coil half 4b is only a rough recognition of the presence of Sandwich layers within the coins 1 possible, the z. B. outside of CuNi and inside of Ni consist. A determination of the thickness and the nickel content of the sandwich layers are included this structure is practically impossible. However, when checking such coins, it is necessary that inner coin layers with 4%, 6% and 8% nickel can be seen in an environment of CuNi are what is made possible by the additional presence of the second coil half 4b.

Durch die gegenphasige Inreiheschaltung der beiden Spulenhälften 4a und 4b werden im Münzkanal 2 die Feldlinien des Wechselmagnetfeldes der Spule 4 um 90° gedreht, so dass sie selbst bei Abwesenheit der Münze 1 nicht mehr senkrecht, sondern parallel zu den Seitenwänden 6 und 7 verlaufen. Bei Vorhandensein der Münze 1 schliessen sich dann die meisten Feldlinien durch die eine niedrigere Reluktanz aufweisende innere Nickelschicht der sandwichförmig aufgebauten Münze 1, was eine gute Detektion dieses Aufbaus und seiner Legierungs-Zusammensetzung ergibt. Die durch das Wechselmagnetfeld verursachten Wirbelströme fliessen in der Münze 1 um deren Feldlinien herum, d. h. sie fliessen in einer Richtung entlang einer Oberfläche der Münze 1 und kehren in der anderen Richtung entlang der anderen Oberfläche der Münze 1 zurück. Wenn die beiden Spulenhälften 4a und 4b identisch sind, d. h. unter anderem gleiche Windungszahlen aufweisen, die mittels eines gleichen Kupferdrahtes gewickelt sind, dann besitzen die beiden Spulenhälften 4a und 4b den gleichen Widerstand R. Da die beiden Spulenhälften elektrisch in Reihe geschaltet sind, ist bei Anwesenheit der beiden Spulenhälften 4a und 4b der Gesamtwiderstand der Spule 4 gleich 2R und die Messempfindlichkeit gleich S = ΔR/2R, da nur die Spulenhälfte 4a einen nennenswerten Beitrag an die Widerstandsänderung der Spule 4 leistet. Der Gesamtwiderstand der Spule 4 wird somit durch die Anwesenheit der Spulenhälfte 4b, die wegen ihres konstanten Abstandes zur Münze 1 keinen Beitrag an AR leistet, verdoppelt sowie die Messempfindlichkeit S halbiert und damit verschlechtert. Dies entspricht einer Verschlechterungder Resolution von 0,05 mm auf 0,1 mm.By connecting the two coil halves 4a and 4b in phase opposition in the coin channel 2 the field lines of the alternating magnetic field of the coil 4 rotated by 90 ° so that they themselves The absence of the coin 1 is no longer vertical, but parallel to the side walls 6 and 7 run. With the presence of coin 1, most of the field lines then close through a lower reluctance inner nickel layer of the sandwich Coin 1, which gives good detection of this structure and its alloy composition. The eddy currents caused by the alternating magnetic field flow around the coin 1 Field lines around, d. H. they flow in one direction along a surface of the coin 1 and return in the other direction along the other surface of the coin 1. If the the two coil halves 4a and 4b are identical, i. H. among other things the same number of turns have, which are wound by means of the same copper wire, then the two Coil halves 4a and 4b have the same resistance R. Since the two coil halves are electrically in Are connected in series is the presence of the two coil halves 4a and 4b Total resistance of coil 4 is 2R and the measurement sensitivity is S = ΔR / 2R, since only that Coil half 4a makes a significant contribution to the change in resistance of the coil 4. Of the Total resistance of the coil 4 is thus due to the presence of the coil half 4b their constant distance to coin 1 makes no contribution to AR, doubles as well Measurement sensitivity S halved and thus deteriorated. This corresponds to deterioration Resolution from 0.05 mm to 0.1 mm.

Die Messempfindlichkeit verschlechtert sich dagegen weniger stark, wenn die Spulenhälfte 4b mit dem Widerstand R', die sich auf der gleichen Seite des Münzkanals 2 befindet wie die Seitenwand 6, unter Beibehaltung der Windungszahl und des Wechselmagnetfeld-Wertes, niederohmiger ist als die andere Spulenhälfte 4a mit dem Widerstand R. In diesem Fall ist die Messempfindlichkeit S = ΔR/[R + R'] mit R' kleiner als R, wobei zwecks Erzielung einer minimalen Verschlechterung R' möglichst klein gegenüber R sein sollte. Die Messempfindlichkeit S ist somit merklich besser, wenn die niederohmigere Spulenhäfte 4b mittels Litzedraht gwickelt ist, während die Spulenhälfte 4a weiterhin herkömmlich, z. B. mittels Kupferdraht gewickelt ist. Der totale Widerstand R' der Spulenhälfte 4b besteht nämlich aus einem Gleichstromanteil RDC und einem durch Skineffekt erzeugten Wechselstromanteil RAC, mit R' = RDC + RAC. In konventionellen Spulen aus einfachem Kupferdraht ist bei Frequenzen im Kilohertzbereich RAC bedeutend grösser als RDC. Bei Verwendung jedoch von Litzedraht für die Spulenhälfte 4b, tritt in deren Stromleitem praktisch keine Stromverdrängung auf, so dass RAC ≅ 0 und der Widerstand R' praktisch auf den Gleichstromanteil RDC reduziert wird. Es gilt dann R' ≅ RDC = R/5. Die Messempfindlichkeit der Spule 4 wird dadurch nur auf S = ΔR/[R + R'] = ΔR/[R + R/5] = [5/6] ΔR/R reduziert. Da die beiden Spulenhälfte 4a und 4b weiterhin gleiche Windungszahlen aufweisen und wegen ihrer Reihenschaltung von einem gleichen Wechselstrom durchflossen werden, hat der Unterschied ihrer Widerstände R und R' keinen Einfluss auf die Symmetrie des durch die Spule 4 erzeugten Magnetfeldes und auf den Verlauf von deren Feldlinien.The measuring sensitivity, on the other hand, deteriorates less if the coil half 4b with the resistance R ', which is located on the same side of the coin channel 2 as the side wall 6, while maintaining the number of turns and the alternating magnetic field value, is lower-resistance than the other coil half 4a with the resistance R. In this case the measuring sensitivity S = ΔR / [R + R '] with R' is less than R, whereby R 'should be as small as possible compared to R in order to achieve a minimal deterioration. The measurement sensitivity S is thus noticeably better if the lower-resistance coil half 4b is wound with a stranded wire, while the coil half 4a continues to be conventional, e.g. B. is wound by means of copper wire. The total resistance R 'of the coil half 4b consists namely of a direct current component R DC and an alternating current component R AC generated by the skin effect, with R' = R DC + R AC . In conventional coils made of simple copper wire, at frequencies in the kilohertz range, R AC is significantly larger than R DC . However, when using stranded wire for the coil half 4b, there is practically no current displacement in its current conductor, so that R AC ≅ 0 and the resistance R 'are practically reduced to the DC component R DC . Then R '≅ R DC = R / 5. The measuring sensitivity of the coil 4 is thereby reduced only to S = ΔR / [R + R '] = ΔR / [R + R / 5] = [5/6] ΔR / R. Since the two coil halves 4a and 4b continue to have the same number of turns and the same alternating current flows through them because of their series connection, the difference in their resistances R and R 'has no influence on the symmetry of the magnetic field generated by the coil 4 and on the course of its field lines .

Der gemessene Wert von ΔR ist eine kombinatorischen Funktion der Münzdicke und der sandwichförmigen Legierungs-Zusammensetzung der Münze 1. Er ergibt somit eine Gleichung an zwei Unbekannten, nämlich der Münzdicke und der Legierungs-Zusammensetzumg. In vielen Fällen genügt zur Erkennung der Echtheit und des Wertes der Münze 1 die Kenntnis der kombinatorischen Wirkung der Münze 1, d. h. die Ermittlung von ΔR. Wenn dies jedoch ungenügend ist, muss mittels der Spule 3 noch zusätzlich die Legierungs-Zusammensetzung der Münze 1 ermittelt werden. Dies ergibt eine zweite Gleichung, so dass total zwei Gleichungen an zwei Unbekannten vorhanden sind, deren Lösung getrennte Werte der beiden Unbekannten ergibt, nämlich der Dicke und der Legierungs-Zusammentsetzung der Münze 1, welche beide Werte für die Echtheit und den Wert der Münze 1 charakteristisch sind.The measured value of ΔR is a combinatorial function of the coin thickness and the sandwich-like alloy composition of the coin 1. It thus gives an equation two unknowns, namely the coin thickness and the alloy composition. In many Knowing the authenticity and the value of the coin 1 is sufficient in cases combinatorial effect of coin 1, d. H. the determination of ΔR. If so, however is insufficient, the alloy composition of the Coin 1 can be determined. This yields a second equation, so a total of two equations there are two unknowns, the solution of which gives separate values of the two unknowns, namely the thickness and the alloy composition of the coin 1, both values for the Authenticity and the value of coin 1 are characteristic.

Claims (2)

  1. An arrangement for checking coins (1) in which in the checking operation the coins (1) progress along a side wall (6) of a coin passage (2) and move past two coil halves (4a, 4b) of a coil (4) which are arranged in mutually opposite relationship on both sides of the coin passage (2) and are electrically connected in series in phase opposition, wherein the axes of the two coil halves (4a, 4b) extend perpendicularly to the side wall (6), characterised in that that coil half (4b) which is on the same side of the coin passage (2) as the side wall (6) is of lower resistance than the other coil half (4a).
  2. An arrangement as set forth in claim 1 characterised in that the coil half (4b) of lower resistance is wound by means of stranded wire.
EP97915378A 1996-03-19 1997-03-18 Coin-checking arrangement Expired - Lifetime EP0888595B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9730011T SI0888595T1 (en) 1996-03-19 1997-03-18 Coin-checking arrangement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH71896 1996-03-19
CH718/96 1996-03-19
CH71896 1996-03-19
PCT/EP1997/001342 WO1997035286A1 (en) 1996-03-19 1997-03-18 Coin-checking arrangement

Publications (2)

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EP0888595A1 EP0888595A1 (en) 1999-01-07
EP0888595B1 true EP0888595B1 (en) 1999-09-08

Family

ID=4193565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97915378A Expired - Lifetime EP0888595B1 (en) 1996-03-19 1997-03-18 Coin-checking arrangement

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US (1) US6065582A (en)
EP (1) EP0888595B1 (en)
AT (1) ATE184410T1 (en)
AU (1) AU2288397A (en)
CA (1) CA2249384A1 (en)
CZ (1) CZ287682B6 (en)
DE (1) DE59700421D1 (en)
EE (1) EE03321B1 (en)
ES (1) ES2135981T3 (en)
GR (1) GR3031428T3 (en)
HU (1) HU220264B (en)
IS (1) IS4843A (en)
NO (1) NO984322D0 (en)
PL (1) PL182765B1 (en)
SK (1) SK283245B6 (en)
WO (1) WO1997035286A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2010000461A1 (en) 2008-07-02 2010-01-07 C.Miethke Gmbh & Co Kg Cerebrospinal fluid drainage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3652545B2 (en) * 1999-04-26 2005-05-25 ローレルバンクマシン株式会社 Coin discrimination device
JP4143711B2 (en) * 2000-08-30 2008-09-03 旭精工株式会社 Coin sensor core
JP4780494B2 (en) * 2005-06-14 2011-09-28 旭精工株式会社 Coin denomination device

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US3986104A (en) * 1976-01-19 1976-10-12 Robert F. Gardiner Dual frequency metal detector system
US4416365A (en) * 1981-08-21 1983-11-22 Mars, Inc. Coin examination apparatus employing an RL relaxation oscillator
US4705154A (en) * 1985-05-17 1987-11-10 Matsushita Electric Industrial Co. Ltd. Coin selection apparatus
CH667546A5 (en) * 1985-07-26 1988-10-14 Autelca Ag COIN CHECKING DEVICE.
GB2234619B (en) * 1989-07-28 1993-04-14 Mars Inc Coin validators
WO1993002431A1 (en) * 1991-07-16 1993-02-04 C.T. Coin A/S Method and apparatus for testing and optionally sorting coins
JPH05128324A (en) * 1991-11-07 1993-05-25 Mitsubishi Electric Corp Non-contact card, terminal machine for non-contact card, and non-contact transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010000461A1 (en) 2008-07-02 2010-01-07 C.Miethke Gmbh & Co Kg Cerebrospinal fluid drainage
DE102008030942A1 (en) 2008-07-02 2010-01-07 Christoph Miethke Gmbh & Co Kg Cerebrospinal fluid drainage

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HUP9901287A2 (en) 1999-08-30
SK283245B6 (en) 2003-04-01
HU220264B (en) 2001-11-28
ES2135981T3 (en) 1999-11-01
DE59700421D1 (en) 1999-10-14
US6065582A (en) 2000-05-23
CZ291198A3 (en) 1999-01-13
IS4843A (en) 1998-09-08
CZ287682B6 (en) 2001-01-17
ATE184410T1 (en) 1999-09-15
EE03321B1 (en) 2000-12-15
NO984322L (en) 1998-09-17
GR3031428T3 (en) 2000-01-31
EP0888595A1 (en) 1999-01-07
CA2249384A1 (en) 1997-09-25
PL182765B1 (en) 2002-02-28
NO984322D0 (en) 1998-09-17
HUP9901287A3 (en) 1999-11-29
SK126498A3 (en) 1999-03-12
WO1997035286A1 (en) 1997-09-25
PL329033A1 (en) 1999-03-01
AU2288397A (en) 1997-10-10

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