DK158418B

DK158418B - PROCEDURE FOR IDENTIFYING THE MOUNTS AND APPARATUS FOR USE IN EXERCISING THE PROCEDURE

Info

Publication number: DK158418B
Application number: DK547985A
Authority: DK
Inventors: Kaj Boerge Hansen
Original assignee: Standard Electric Kirk
Priority date: 1985-11-27
Filing date: 1985-11-27
Publication date: 1990-05-14
Also published as: NZ218263A; ATE99816T1; NO864581D0; AU6519686A; JPH0529959B2; DE3689514D1; EP0224946A2; FI88968C; NO171936C; DK547985D0; EP0224946B1; FI88968B; ES2047475T3; DK158418C; NO171936B; AU585092B2; FI864580A; DK547985A; DE3689514T2; FI864580A0

Abstract

Certain properties of a coin (1) are measured while the coin runs down a ramp (2) and passes between a pair of coils (6). Measurements in the form of attenuated signals (A1, A2, A3, Amax) are taken at several positions determined by coin edge sensing means (3, 4, 5) detecting the trailing edge of the coin.

Description

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Opfindelsen angår en fremgangsmåde af den i krav l's indledning angivne art.The invention relates to a method of the kind set out in the preamble of claim 1.

Man kender møntfiltre, f.eks. fra engelsk patent nr.You know coin filters, e.g. from English patent no.

1 551 209, som angiver et apparat til undersøgelse af 5 metalstykker, især mønter, ved hvilket elektromagnetisk reaktion måles ved forubestemte tidsperioder i relation til hastigheden, med hvilken mønten passerer detektoren.1 551 209, which discloses an apparatus for examining 5 metal pieces, especially coins, by which electromagnetic reaction is measured at predetermined periods of time in relation to the rate at which the coin passes the detector.

Engelsk offentliggørelsesskrift nr. 2 107 104 beskriver et møntidentificeringsapparat med en induktiv spole 10 viklet på en ferritkerne med to poler, som er tilpas set i størrelse og placering til mønttyperne, som de-tekteres. Møntens indvirkning på det elektromagnetiske felt måles, når den befinder sig mellem polerne, og når den er i nærheden af hver polflade.English Publication No. 2 107 104 discloses a coin identification apparatus with an inductive coil 10 wound on a two-pole ferrite core which is adjustable in size and position to the coin types detected. The effect of the coin on the electromagnetic field is measured when it is between the poles and when it is near each pole surface.

15 Engelsk offentliggørelsesskrift nr. 2 086 633 beskriver et møntsorteringsapparat med en kombination af elektromagnetiske og fotoelektriske følere til at skelne mellem mønter^med forskellig permeabilitet.English Publication No. 2,086,633 discloses a coin grading apparatus with a combination of electromagnetic and photoelectric sensors for distinguishing coins of different permeability.

DE offentliggørelsesskrift nr. 2 716 740 beskriver et 20 apparat med et kompliceret system af kapacititive, in duktive og fotoelektriske følere til at identificere mønter.DE Publication 2,716,740 discloses a 20 apparatus with a complicated system of capacitive, inductive and photoelectric sensors for identifying coins.

Endelig er det fra USA-patent nr. 3 869 663 kendt at foretage elektromagnetiske målinger med to forskellige 25 spolepar, og disse målinger evalueres af individuelle anordninger.Finally, from US Patent No. 3,869,663, it is known to make electromagnetic measurements with two different 25 coil pairs, and these measurements are evaluated by individual devices.

De kendte fremgangsmåder anses for at give temmelig upålidelige resultater, og formålet med opfindelsen er at opnå sikre måleresultater på en simplere måde. 1The known methods are considered to give rather unreliable results and the object of the invention is to obtain safe measurement results in a simpler way. 1

Dette formål opnås ifølge opfindelsen ved, at den ind-This object is achieved according to the invention in that it incorporates

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2 ledningsvis angivne fremgangsmåde er ejendommelig ved det i krav l's kendetegnende del angivne.2 is characterized in that the characterizing part of claim 1 is characterized.

Ued fremgangsmåden ifølge opfindelsen anvendes kun et spolepar (simpel elektronik, små dimensioner, lav pris 5 og høj pålidelighed). Der foretages en serie målinger styret af lyskanaler. Lysdioderne er kun tændt én ad gangen, og den første tænder netop, når mønten "føles" af spolen. Dette giver ekstremt kort tid - dioderne er strømførende - og dermed lavt strømforbrug.Only one coil pair (simple electronics, small dimensions, low cost 5 and high reliability) is used in the process according to the invention. A series of measurements are controlled by light channels. The LEDs are only lit one at a time, and the first one turns on precisely when the coin is "felt" by the coil. This gives an extremely short time - the diodes are live - and thus low power consumption.

10 Lyskanalstyringen af spolemålingerne giver for "alle" møntdiametre mindst én måleværdi, der er stærkt afhængig af diameteren. Samtidig gives mulighed for på ekstrem lille plads at styre spolen af målinger, hvoraf enkelte differencer på måleværdierne er stærkt afhængige af 15 prægningen.10 The light channel control of the coil measurements provides for "all" coin diameters at least one measurement value which is strongly dependent on the diameter. At the same time, it is possible to control the coil of measurements in an extremely small space, of which some differences in the measurement values are strongly dependent on the embossing.

Styringen af dæmpningsmålingerne med rækken af optiske kanaler giver i modsætning til kendte systemer mulighed for at følge dæmpningsforløbet for samtlige møntstørrelser for dæmpninger fra nul til maksimaldæmpningen.Controlling the attenuation measurements with the series of optical channels, unlike known systems, allows the attenuation process to be followed for all coin sizes for attenuation from zero to maximum attenuation.

20 Derfor vil der for samtlige møntstørrelser være en ræk ke målinger, hvor differencen mellem nabomålinger er et udtryk for møntens profil (prægning).20 Therefore, for all coin sizes, there will be a number of measurements where the difference between neighboring measurements is an expression of the coin profile (embossing).

Opfindelsen angår endvidere et apparat af den i krav 7 angivne art til udøvelse af fremgangsmåden, hvilket 25 apparat er ejendommeligt ved det i krav 7's kendeteg nende del angivne.The invention further relates to an apparatus of the kind specified in claim 7 for carrying out the method, which apparatus is characterized by the characterizing part of claim 7.

Opfindelsen skal i det følgende nærmere beskrives med henvisning til tegningen, hvorpå: fig. 1 viser de generelle principper ved møntkantdetek-30 teringsorganer i relation til en række koblede mønter, 3The invention will now be described in more detail with reference to the drawing, in which: FIG. 1 shows the general principles of coin edge detection means in relation to a series of coupled coins; 3

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fig. 2 og 3 viser spoleindgangs- og udgangssignaler, som fremkommer i en hviletilstand og i en aktiveret tilstand, fig. 4 viser virkningen af at anbringe en møntkantde-tektor tæt ved oversiden af mønten, fig. 5 viser et skematisk blokdiagram af et møntidentificeringskredsløb, fig. 6 viser spændinger af signifikante signaler, som fremkommer i kredsløbet i fig. 5, og fig. 7 viser de mellemlagrede resultater af møntiden-fikatoren.FIG. 2 and 3 show coil input and output signals which appear in a resting state and in an activated state; 4 shows the effect of placing a coin edge detector close to the top of the coin; FIG. 5 is a schematic block diagram of a coin identification circuit; FIG. 6 shows voltages of significant signals appearing in the circuit of FIG. 5, and FIG. 7 shows the intermediate stored results of the coin-time fixator.

De generelle principper er vist i fig. 1. Alle indførte mønter 1 løber ned af en rampe 2, og alle målinger udføres dynamisk inden for et kort tidsrum og med anvendelse af et minimum af effekt.The general principles are shown in FIG. 1. All introduced coins 1 run down a ramp 2 and all measurements are performed dynamically within a short period of time and using a minimum of power.

Mønten afbryder et antal lyskanaler 3, 4, 5, før den passerer imellem et par spoler 6.The coin interrupts a number of light channels 3, 4, 5 before passing between a pair of coils 6.

Nedsættelsen af koblingen mellem spolerne måles et antal gange med mønten i forskellige positioner styret af lyskanalerne.The reduction of the coupling between the coils is measured a number of times with the coin in different positions controlled by the light channels.

Principperne for målingerne er vist i fig. 2-4. Koblingen mellem spolerne 6 skal først beskrives. Et sinusformet signal E afgives af en spole CE. Når der ingen mønt findes imellem de to spoler CE, CR, bliver signalet modtaget udæmpet. Amplituden af det modtagne signal R bestemmes af de to spolers koblings faktor. Når en mønt kommer ind imellem de to spoler CE, CR, bliver det modtagne signal dæmpet.The principles for the measurements are shown in fig. 2-4. The coupling between the coils 6 must first be described. A sinusoidal signal E is output by a coil CE. When no coin exists between the two coils CE, CR, the signal received is attenuated. The amplitude of the received signal R is determined by the coupling factor of the two coils. When a coin comes in between the two coils CE, CR, the received signal is attenuated.

44

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Amplitudeforskellen (dæmpning A^) på det modtagne signal er resultaterne (Al, A2, A3, ... An og Amax), som måles for forskellige positioner af mønten.The amplitude difference (attenuation A ^) on the received signal is the results (Al, A2, A3, ... An and Amax), which are measured for different positions of the coin.

Lyskanalerne 3, 4, 5 er anbragt i forskellige højder 5 over rampen 2 og i forskellig afstand fra møntens cen trum. Lyskanalerne bør være anbragt således, at ingen kanaler samtidigt rammer bagkanten af en passerende mønt. For hver diameter af de forskellige mønter bør der være en lyskanal anbragt tæt ved møntens overside, 10 f.eks. ved en position, som er højere end 80?0 af møn tens diameter. Ved at udføre en koblingsmåling lige når den rullende mønt åbner for lyskanalen, opnås en høj diameterselektivitet, fordi en ringe differens i diameter giver en stor differens 7 i delen af mønten, 15 som er til stede imellem spolernes følsomme dele 8 ved det øjeblik. Dette er vist i fig. 4.The light channels 3, 4, 5 are arranged at different heights 5 above the ramp 2 and at different distances from the center of the coin. The light channels should be arranged so that no channels simultaneously strike the trailing edge of a passing coin. For each diameter of the different coins there should be a light channel located close to the top of the coin, e.g. at a position higher than 80? 0 of the diameter of the coin. By conducting a coupling measurement just when the rolling coin opens to the light channel, a high diameter selectivity is obtained because a small difference in diameter produces a large difference 7 in the part of the coin 15 present between the sensitive parts 8 of the coils at that moment. This is shown in FIG. 4th

Ved at udføre flere målinger i rækkefølge med samme par spoler, vil "hastigheden" af dæmpningsændringen blive målt i tilknytning til den maksimale dæmpning.By performing multiple measurements in sequence with the same pair of coils, the "velocity" of the attenuation change will be measured in association with the maximum attenuation.

20 Dette giver en indikation af møntens prægning. De stør ste og normalt mest kostbare mønter vil bryde de fleste af lyskanalerne og derved give relevante målinger.20 This gives an indication of the coin's imprint. The largest and usually most expensive coins will break most of the light channels, thus providing relevant measurements.

Den første måling bør fortrinsvis vise den mindste dæmpning. Lyskanalerne bør være således indrettet, at mindst 25 1¾ (fortrinsvis imellem 1-20?ό) af møntarealet er inden for den følsomme del af spolen, når den første måling fore tages.The first measurement should preferably show the smallest attenuation. The light channels should be arranged so that at least 25 1¾ (preferably between 1-20? Ό) of the coin area is within the sensitive portion of the coil when the first measurement is made.

Blokdiagrammet af et møntidentificeringskredsløb er vist i fig. 5 (i den følgende beskrivelse er antallet 50 er lyskanaler sat til tre). Møntidentificeringskreds løbet indeholder en mikrodatamat 10 med følgende kontrollinier : 5The block diagram of a coin identification circuit is shown in FIG. 5 (in the following description, the number 50 is light channels set to three). The coin identification circuit contains a microcomputer 10 with the following control lines: 5

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LC1, LC2 og LC3: LyskanalvalgLC1, LC2 and LC3: Light channel selection

Reset: Resetlinie til at tilbagestille en 8 bit tæller 11 efter afslutning af målinger.Reset: Reset line to reset an 8 bit counter 11 upon completion of measurements.

5 Information gives til mikro-datamaten 10 via følgende udgangslinier :Information is provided to the microcomputer 10 via the following output lines:

Databus (DB): Alle målte resultater (Al, A2, ...) sendes til mikrodatamaten 10 via otte udgangslinier fra en 8 bit port 12.Databus (DB): All measured results (Al, A2, ...) are sent to the microcomputer 10 via eight output lines from an 8 bit port 12.

10 Afbrudt (INT): Denne linie signalerer (INT) til mikro datamaten 10, at et resultat er til stede ved porten 12.10 Interrupted (INT): This line signals (INT) to the microcomputer 10 that a result is present at the port 12.

Tælleren 11 tæller antallet af impulser set på en linie CP2 fra en clock-impuls generator 13. Dette er et direk-15 te binært mål for dæmpning Ai.The counter 11 counts the number of pulses seen on a line CP2 from a clock pulse generator 13. This is a direct binary measure of attenuation A 1.

Valg af lyskanaler ELC1-3, er LC1-3 foretages i en væl-ger/dekoder 20 med mikrodatamaten 10 via kontrollinier LC1, LC2 og LC3, som er aktiveret, når tællere 11 går fra sin reset hvileposition.Selection of light channels ELC1-3, LC1-3 is made in a selector / decoder 20 with the microcomputer 10 via control lines LC1, LC2 and LC3 which are activated when counters 11 leave from its reset rest position.

20 Modtagerdelen for vælger/dekoderen 10 sender signalet INT til mikrodatamaten 10 for hver position af mønten, hvor resultaterne skal aflæses fra porten 12. Når signalet INT er til stede, låses indholdet af porten 12. Clock-impulsgeneratoren 13 forsyner transmissions- el-25 ler emissionsspolen CE med en vekselspænding CP1, som gøres sinusformet med et RC-netværk RCE.20 The receiver portion of the selector / decoder 10 sends the signal INT to the microcomputer 10 for each position of the coin, where the results are to be read from the port 12. When the signal INT is present, the contents of the port 12. The pulse generator 13 is supplied with the transmission electricity-25. lays the emission coil CE with an alternating voltage CP1, which is sinusoidal with an RC network RCE.

Generatoren tilfører også clock-impulser CP2 til tælleren 11, når den ikke er spærret med en komparator 15. Generatoren 13 er forsynet med et impulsstrækningsar-The generator also supplies clock pulses CP2 to the counter 11 when it is not blocked by a comparator 15. The generator 13 is provided with a pulse stretching circuit.

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6 rangement til det spærrende signal INH fra komparato-ren 15.6 ranks to the blocking signal INH from the comparator 15.

Indholdet af tælleren 11 sendes til mikrodatamaten 10 via porten 12. Når signalet INT bliver "lavt" bliver 5 indholdet låst. Med et "højt" signal på INT linien trans mitteres sender indholdet direkte til databussen DB.The contents of the counter 11 are sent to the microcomputer 10 via the port 12. When the signal INT becomes "low", the contents are locked. With a "high" signal on the INT line transmitted, the content is sent directly to the data bus DB.

En digital/analog konverter (D/A) 16 oversætter tællerens 11 binære indhold til et analogsignal, som føres til komparatoren 15. På kampara torens 15 indgange b1 i — 10 ver niveauet af det modtagne signal 0UT-C0IL fra den modtagende spole CR sammenlignet med udgangssignalet OUT-DA fra D/A konverteren 16, jfr. fig. 6.A digital / analog converter (D / A) 16 translates the binary content of the counter 11 into an analog signal which is fed to the comparator 15. At the inputs b1 of - 10 of the camcorder 15, the level of the received signal 0UT-C0IL from the receiving coil CR is compared. with the output signal OUT-DA from the D / A converter 16, cf. FIG. 6th

Når OUT-COIL-signalet bliver lavere end OUT-DA-signa-let, bliver komparatorudgangen INH lav. I hvileposition 15 vil dette forekomme for hver negativ halvbølge for OUT- COIL-signalet. Impulsstrække ren i clock-impulsgeneratoren 13 dækker perioden- imellem halvbølgen, og når lange impulser ankommer med korte intervaller (se fig. 6), bliver clock-impulsen CP2 til tælleren II spærret.When the OUT-COIL signal becomes lower than the OUT-DA signal, the comparator output INH becomes low. At rest position 15, this will occur for each negative half-wave of the OUTCOIL signal. Pulse stretches clean in the clock pulse generator 13 cover the period between the half-wave and when long pulses arrive at short intervals (see Fig. 6), the clock pulse CP2 of the counter II is blocked.

20 Udførelsen af målingerne skal nu beskrives med henvis ning til fig. 5 og 6. I hviletilstanden RM er niveauet af OUT-DA-signalet til stede, således at den negative halvbølge af det modtagne signal 0UT-C0IL altid går under signalet OUT-DA, når tæller indholdet er nul. Hver 25 gang OUT-COIL-signalet kommer under OUT-DA, bliver ud gangen af komparatoren 15 lav, og clock-impulsen CP2 for tælleren 11 spærret. Impulss trække ren i clock-gene-ratoren 13 dækker perioden mellem negative halvbølger.20 The performance of the measurements will now be described with reference to FIG. 5 and 6. In the idle state RM, the level of the OUT-DA signal is present such that the negative half-wave of the received signal 0UT-C0IL always goes below the signal OUT-DA when the counter content is zero. Every 25 times the OUT-COIL signal goes below OUT-DA, the output of comparator 15 becomes low and the clock pulse CP2 of counter 11 is blocked. Impulses draw clean in clock generator 13 covering the period between negative half waves.

Tælleren 11 forbliver ved nul og OUT-DA-signalet for-30 bliver stabilt.The counter 11 remains at zero and the OUT-DA signal for-30 becomes stable.

Spændingerne på følgende udgange er vist skematisk: 7The voltages at the following outputs are shown schematically: 7

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OUT-COIL, OUT-DA, INH og CP2. Frekvenser er ikke korrekte i relation til tiden for møntens passage.OUT-COIL, OUT-DA, INH and CP2. Frequencies are not correct in relation to the time of coin passage.

Passagen af en mønt mellem spoler er den aktiverede tilstand AM, som nu skal beskrives. Virkningen af en 5 mønt imellem senderspolen CE og modtagerspolen CR er, at amplituden af det modtagne signal 0UT-C0IL er dæmpet. Dette betyder, at den negative halvbølge af det modtagne signal ikke længere går under OUT-DA. Derfor vil der ikke blive detekteret flere impulser i INH-sig-10 nalet ved udgangen af komparatoren 15.The passage of a coin between coils is the activated state AM, which will now be described. The effect of a 5 coin between transmitter coil CE and receiver coil CR is that the amplitude of the received signal 0UT-COIL is attenuated. This means that the negative half-wave of the received signal no longer goes below OUT-DA. Therefore, no more pulses will be detected in the INH signal at the output of comparator 15.

Med INH-signalet stabilt ved dets høje niveau, bliver clock-impulssignalet CP2 ikke længere spærret og tælleren 11 begynder at tælle. Indholdet af denne tæller konverteres nu til et analogsignal via D/A konverte-15 ren 16. Eftersom det binære indgangssignal fra D/A kon verteren 16 vokser, vil dens udgangssignal OUT-DA også vokse.With the INH signal stable at its high level, the clock pulse signal CP2 is no longer blocked and counter 11 begins to count. The content of this counter is now converted to an analog signal via D / A converter 16. As the binary input signal from D / A converter 16 grows, its output signal OUT-DA will also grow.

Som det fremgår"af fig. 6, vil signalet OUT-DA følge den dæmpede amplitude af det modtagne signal, indtil 20 den maksimale dæmpning er nået. Når dette niveau én gang er nået med OUT-DA, begynder amplituden af signalet 0UT-C0IL at vokse, og den negative halvbølge af signalet vil gå under OUT-DA igen. Som en konsekvens vil INH-linien begynde at pulsere igen, CP2 spærres 25 og tælleren standser i positionen, den er nået, og for bliver stabil. Indholdet af tælleren er et antal, som angiver den maksimale -dæmpning for mønten og OUT-DA forbliver stabil ved det maksimale dæmpningsniveau.As shown in Fig. 6, the signal OUT-DA will follow the attenuated amplitude of the received signal until the maximum attenuation is reached. Once this level is reached with OUT-DA, the amplitude of the signal 0UT-C0IL begins As a consequence, the INH line will start pulsating again, CP2 will be blocked 25 and the counter will stop at the position it has reached and will become stable. is a number that indicates the maximum coin attenuation and OUT-DA remains stable at the maximum attenuation level.

Desuden forbliver informationen fra porten 12 til DB-50 linien stabil ved dens højeste værdi for den særlige mønt.In addition, the information from the port 12 to the DB-50 line remains stable at its highest value for the particular coin.

Målinger af "hastigheden" af dæmpningsændring skal nuMeasurements of the "speed" of attenuation change should now

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8 beskrives. Med identificeringskredsløbet i hvileposition, tilbagestilles tælleren 11 til nul og et højt niveau-signal føres på lysvælgerlinien LC1. Når nu en mønt indføres mellem spolerne og begynder dæmpningen 5 af OUT-COIL-signalet, vil vælger/dekoderen 14 føre et signal på emitteren for den første lyskanal i LC1. Når mønten åbner for lyset til den første lysmodtager RLC1, vil vælger/dekoderen 14 låse indholdet af porten 12 og give et INT-signal til mikrodatamaten 10. Mikroda-10 tamaten vil læse porten 12, oplagre dette resultat som "resulterende første dæmpning" Al og ændre højniveausignalet fra LC1 til LC2.8 is described. With the identification circuit in the idle position, the counter 11 is reset to zero and a high level signal is applied to the light selector line LC1. Now, when a coin is inserted between the coils and the attenuation 5 of the OUT-COIL signal begins, selector / decoder 14 will output a signal on the emitter of the first light channel in LC1. When the coin opens to the light of the first light receiver RLC1, the selector / decoder 14 will lock the contents of the port 12 and provide an INT signal to the microcomputer 10. The microda-10 tomato will read the port 12, storing this result as "resulting first attenuation" A1 and change the high level signal from LC1 to LC2.

INT-signalet forsvinder således, at porten 12 åbnes for nye data og ELC2 tændes. Tælleren vil fortsætte 15 med at løbe, når mønten passerer spolen på sin vej til den maksimale dæmpningsposition. Når RLC2 modtager lys, vil indholdet af porten 12, som læser det akkumulerede tal i tælleren 11, igen blive låst, et nyt INT-signal får mikrodatamaten til at læse porten 12, oplagre resul-20 tatet som "resulterende anden dæmpning" A2 og skifte højniveausignalet fra LC2 til LC3. Efter oplagring af "resulterende tredje dæmpning" A3, fjernes højniveausignalet på LC3 og INT-signalet forsvinder, således at porten 12 er åben igen for nye data. 1 2 3 4 5 6The INT signal disappears so that gate 12 is opened for new data and ELC2 is turned on. The counter will continue to run 15 as the coin passes the coil on its way to the maximum damping position. When RLC2 receives light, the contents of port 12, which reads the accumulated number in counter 11, will again be locked, a new INT signal causes the microcomputer to read port 12, store the result as "resulting second attenuation" A2, and switch the high level signal from LC2 to LC3. After storing "resulting third attenuation" A3, the high level signal on LC3 is removed and the INT signal disappears, leaving port 12 open again for new data. 1 2 3 4 5 6

Derefter venter mikrodatamaten 10 på det maksimale dæmp 2 ningsniveau for den bestemte mønt ved at undersøge ind 3 holdet af tælleren 11 via porten 12 hvert ottende mil 4 lisekund. Når to på hinanden følgende målinger viser, 5 at tællerindholdet forbliver uændret (forskelligt fra 6 nul), bliver portindholdet lagret som "resulterende maksimal dæmpning" (A max). Derefter bliver tælleren 11 nulstillet og et højniveau-signal lagt på LC1, idet der ventes på den næste mønt. Emitteren ELC1 er imidlertid ikke tændt før en ny mønt begynder dæmpning af 9Then, the microcomputer 10 waits for the maximum attenuation level of 2 for the particular coin by examining the hold of counter 11 via port 12 every eight miles 4 lisecond. When two consecutive measurements show 5 that the counter contents remain unchanged (different from 6 zero), the gate contents are stored as "resulting maximum attenuation" (A max). Then counter 11 is reset and a high-level signal is placed on LC1, waiting for the next coin. However, the emitter ELC1 is not turned on until a new coin starts attenuation of 9

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spolesignalerne.coil signals.

Til et bedre identificeringskredsløb med tre kanaler vil der være fire mellemlagrede resultater Al, A2, A3 og A max, som vist i fig. 7.For a better three-channel identification circuit, there will be four intermediate stored results A1, A2, A3 and A max, as shown in FIG. 7th

5 Fig. 7 viser dæmpningen som repræsenteret med OUT-COIL- signalet, som fremkommer under passagen AM af en mønt. Clock-impulserne CP til tælleren 11 er også angivet samt positionerne på OUT-COIL-indhylningskurven, hvor dæmpningsmålingerne Al, A2, A3 og Amax foretages. OUT-10 DA-signalet bliver lavt, så snart tælleren 11 er nul stillet.FIG. 7 shows the attenuation as represented by the OUT-COIL signal which appears during the passage AM of a coin. The clock pulses CP to the counter 11 are also indicated as well as the positions of the OUT-COIL envelope where the attenuation measurements A1, A2, A3 and Amax are made. The OUT-10 DA signal becomes low as soon as counter 11 is reset.

Eftersom den maksimale dæmpning for en specifik mønt (resulterende Amax) har en sammenhæng med de øvrige målte dæmpninger, (resultat Al, A2 og A3) bestemt ved 15 geometrien og prægningen af mønten, vil forskellen mel lem tilhørende resultater være repræsenteret ved en langt smallere Gauss-fordelingskurve for en tilfældig prøve end det rrraks imale resultat Amax alene ville give.Since the maximum attenuation for a specific coin (resulting Amax) is related to the other measured attenuations, (results A1, A2 and A3) determined by the geometry and embossing of the coin, the difference between results will be represented by a much narrower one. Gaussian distribution curve for a random sample than the exact result Amax alone would give.

De målte værdier kan kombineres på mange måder. En høj 20 selektivitet kan opnås ved at anvende to kalkulerede værdier Amax-A3 og A3-A2 i tilknytning til tre af de først målte resultater (Al, A2 og Amax).The measured values can be combined in many ways. A high selectivity can be achieved by using two calculated values Amax-A3 and A3-A2 in association with three of the first measured results (A1, A2 and Amax).

For en møntidentifikator med tre lyskanaler skal følgende resultater således være inden for de i forvejen 25 programmerede acceptgrænser:Thus, for a coin identifier with three light channels, the following results must be within the pre-programmed acceptance limits:

Resulterende maksimaldæmpning AmaxResulting maximum attenuation Amax

Resulterende første dæmpning AlResulting first attenuation Al

Resulterende anden dæmpning A2Resulting second attenuation A2

Resulterende sammenhæng Cl Am'ax-A3 30 Resulterende sammenhæng C2 A3-A2 10Resulting context Cl Am'ax-A3 30 Resulting context C2 A3-A2 10

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Indstilling af grænserne kan udføres ved at indføre en tilfældig prøve på en mønttype i møntidentifikato-ren. Resultatet af de forskellig målinger for denne prøve kan så repræsenteres ved Gauss-fordelinger karak-5 teriseret ved middelværdi (^,u) og standardafvigelse (d).Setting the limits can be done by entering a random sample of a coin type into the coin identifier. The result of the different measurements for this sample can then be represented by Gaussian distributions characterized by mean (,, u) and standard deviation (d).

Grænserne for fem resultater beregnes så (f.eks.^u-2d) og lagres i en EPROM.The boundaries of five results are then calculated (eg ^ u-2d) and stored in an EPROM.

Ued valg af mønterne, som skal prøves, kan antallet 10 af mønter i hver prøve til indstilling af grænserne være lille.Without selecting the coins to be tested, the number of 10 coins in each sample for setting the limits may be small.

Et "rutediagram" for den foreliggende opfindelse kan opremses som følger: - tæller bliver nulstillet, 15 - lys afbrudt, - udæmpet signal bliver modtaget med modtagerspole, - mønt indføres mellem spoler - signalet begynder at blive dæmpet - tælleren begynder at tælle, ikke tid, men vokser trin- 20 vis (trinvis voksende) i dæmpning - lyskanal 1 sluttes til - mønt blokerer lys - mønt åbner for lys - møntstatus registreres (Al) 25 - lyskanal 1 afbrydes - lyskanal 2 tilsluttes - mønt åbner for lys - møntstatus registreres (A2) - lyskanal 2 afbrydes 50 - tællerindhold bliver kontinuerligt undersøgt for at bestemme maksimal dæmpning - maksimal dæmpning findes - tællerstatus registreres (Amax)A "flowchart" of the present invention can be listed as follows: - counter is reset, 15 - light interrupted, - attenuated signal is received with receiver coil, - coin is inserted between coils - signal begins to be attenuated - counter starts counting, not time but grows gradually (incrementally increasing) at dimming - light channel 1 is connected - coin blocks light - coin opens for light - coin status is registered (Al) 25 - light channel 1 is disconnected - light channel 2 is connected - coin opens for light - coin status is registered (A2) - light channel 2 is switched off 50 - counter contents are continuously examined to determine maximum attenuation - maximum attenuation exists - counter status recorded (Amax)

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11 - tæller nulstilles - registrerede tal (Al, A2.....Amax) evalueres indivi duelt og/eller i kombination - mønt accepteres eller afvises 5 - klar til ny mønt.11 - counter resets - registered numbers (A1, A2 ..... Amax) are evaluated individually and / or in combination - coin accepted or rejected 5 - ready for new coin.

Mindre mønter blokerer ikke for lyskanal 1 (og 2). Resultaterne Al (og A2) registreres omgående i tælleren.Smaller coins do not block light channel 1 (and 2). Results A1 (and A2) are immediately recorded in the counter.

Claims

A method of identifying coins, including guiding a coin (1) through a passage (2) in which certain properties of the coin are measured by an electromagnetic means (6), and wherein measurements are performed at a position which is determined by coin edge sensing means (3, 4, 5), characterized in that with the electromagnetic means (6), which consists of a pair of coils, a number of electromagnetic measurements are performed at different positions of the coin (1) in the passage (2 10, that at least two of the positions are determined by individual optical sensors (3, 4, 5), that each of the measurements comprises recording a signal (A1, A2, A3, Amax) which represents some attenuation of a resting state signal. emitted from the electromagnetic means (6), and at least three of the signals and / or combination of signals are compared with reference values for accepting or rejecting the coin.

Method according to claim 1, characterized in that measurements are made by reading a counter 20 (11) which is incremented by incremental increases in the attenuation.

Method according to claim 1, characterized in that the damping is measured at at least one position adjacent to a maximum damping measurement position.

Method according to claim 2, characterized in that the counter (11) is started at the input of the coin (1) into the electromagnetic field of the electromagnetic device (CE / CR).

Method according to claim 2, characterized in that at least one reading of the counter is made in a coin position, where one of the optical sensors (3, Fig. 1 is near the top of the coin (1)).

Method according to claim 1, characterized in that measurements are taken at positions (3, 4, 3), where the "trailing edge" of a passing coin is recorded.

Apparatus for use in the method according to claim 1, characterized in that it comprises at least one optical sensor located near the top edge (higher than 80% of the coin diameter) of at least one of the coins to be measured.

Apparatus according to claim 7, characterized in that the optical sensors (3, 4, 5) are arranged such that at least 1% (preferably 1-20%) of the coin area is within the electromagnetic field of the electromagnetic body when the first of said optical sensors detects the coin.