EP0053735B1 - Circuit pour l'examen de pièces de monnaie - Google Patents

Circuit pour l'examen de pièces de monnaie Download PDF

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Publication number
EP0053735B1
EP0053735B1 EP81109571A EP81109571A EP0053735B1 EP 0053735 B1 EP0053735 B1 EP 0053735B1 EP 81109571 A EP81109571 A EP 81109571A EP 81109571 A EP81109571 A EP 81109571A EP 0053735 B1 EP0053735 B1 EP 0053735B1
Authority
EP
European Patent Office
Prior art keywords
coin
amplification
value
oscillator
threshold value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81109571A
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German (de)
English (en)
Other versions
EP0053735A1 (fr
Inventor
Pierre Dubey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ascom Autelca AG
Autelca AG
Original Assignee
Ascom Autelca AG
Autelca AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ascom Autelca AG, Autelca AG filed Critical Ascom Autelca AG
Priority to AT81109571T priority Critical patent/ATE15288T1/de
Publication of EP0053735A1 publication Critical patent/EP0053735A1/fr
Application granted granted Critical
Publication of EP0053735B1 publication Critical patent/EP0053735B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G07D5/08—Testing the magnetic or electric properties

Definitions

  • the invention relates to a circuit arrangement in a coin validator according to the preamble of claim 1.
  • a circuit arrangement of this type is known from DE-A 2 159 599.
  • a negative feedback of the amplifier of an oscillator which determines the gain, is set during coin validation to a first, predetermined tolerance limit value, at which an acceptable coin suspends the oscillator oscillations, and to a second, predetermined tolerance limit value, at which an acceptable coin does not oscillate suspends.
  • a coin acceptance signal accordingly occurs when the oscillator vibrations stop at the first tolerance limit value and start again at the second tolerance limit value.
  • the tolerance limit values could not be set according to the limit values of the conductivity range of acceptable coins. Otherwise acceptable coins would not have been accepted due to changed conditions.
  • a relatively large tolerance range has therefore been specified and the disadvantage accepted that even unacceptable coins or coin-like bodies, the conductivity of which differs only slightly from that of acceptable coins, are accepted.
  • the invention as characterized in the Asnprüchen, solves the problem of making the coin check independent of changes in external conditions and influences, such as temperature, aging of the circuit parts and contamination of the coin channel.
  • the advantages achieved by the invention are essentially to be seen in the fact that the tolerance range of the coin check can be limited precisely to the properties of acceptable coins, in particular precisely to the permissible conductivity range, so that no additional tolerances have to be provided for changing external parameters.
  • the invention ensures that any change in all parameters influencing the test is compensated for.
  • the resonant circuit of the circuit arrangement according to the invention can be self-excited, i. H. form an oscillator together with the amplifier. However, it can also be inductively or capacitively coupled to an oscillator or another external source, the coin to be tested influencing the coupling field and the amplifier amplifying the oscillating circuit voltage which is dependent on this influence.
  • the output 1 of an operational amplifier 2 is connected to its feedback input 3 by a feedback path 4 and 5, to which an oscillating circuit 6, 7 is connected.
  • a coin channel (not shown) leads through the field of the oscillating circuit coil 6.
  • At a negative feedback input 8 of the operational amplifier 2 is part of the output voltage of the same, which is tapped at a voltage divider.
  • the voltage divider consists of a fixed resistor 9 connected between the output 1 and the input 8 and one or more of the resistors 11 to 18 which can be switched into the voltage divider by applying one or more of the switching transistors 21 to 28.
  • the resistance value of the voltage divider part resistor 11 to 18, at which the negative feedback voltage is tapped, can be changed in 255 steps.
  • the switching transistors 21 to 28 can be acted upon individually and in combinations by a program control device 29, as a result of which 255 different degrees of negative feedback can be set.
  • the relevant part of the program is - as will be described in more detail below - in such a way that all 255 or selected gain levels are set successively in increasing (or decreasing) order.
  • a comparator 30 compares the output signal of the amplifier 2 with a reference voltage at the output 31 of a voltage stabilizer 32.
  • the reactance one between the resistor 9 and the counter Stands 11 to 18 connected capacitor 33 is small compared to a discharge resistor 34 connected in parallel.
  • a calibration resistor 35 can be connected in parallel to the resonant circuit capacitor 7 by means of a transistor 36.
  • the resistor 35 when it is connected in parallel to the resonant circuit 6, 7 by the application of the transistor 36, has the same effect as a coin 37 of a certain acceptable type in the coil field 6.
  • the one that is used is expediently determined from the various types of coin which has a medium damping of the resonant circuit, based on the damping range given by all coins.
  • the resistor 35 is small compared to a resistor 38, via which the stabilized direct voltage at the output 31 is led to the amplifier input 3.
  • the program control device 29 has a memory 39 with two memory parts, namely a read-only memory 49 (ROM or REPROM) and a read / write memory 59 (RAM), and an arithmetic logic unit 69.
  • ROM read-only memory
  • RAM read / write memory
  • a normal value of the gain as well as two predetermined tolerance limit values of the gain are stored for each acceptable coin type, which are referred to as normal limit values in the following.
  • the amplification values are the resistance values of the voltage divider partial resistor 11-18 which determine the amplification and from which the negative feedback voltage is tapped.
  • the storage takes place in each case together with a code word which indicates which of the transistors 21 to 28 are conductive and which are not conductive.
  • the normal value of the gain is determined under normal conditions (temperature, operating voltage) and without a coin being in the field of the coil 6, as follows: First, the resistor 35 is connected in parallel with the resonant circuit 6, 7 by applying the transistor 36. The program controller 29 then acts on the transistors 21 to 28 in such a way that the partial resistor 11 to 18 is gradually increased starting with the smallest of the 255 resistance values (all transistors 11-18 acted on). At the smallest resistance value, the negative feedback is minimal, that is to say the amplification is maximum and the oscillator 2, 6, 7 oscillates. The comparator 30 supplies pulses to the program controller 29 in time with the upper half-wave of the oscillator oscillations.
  • two normal limit values for the gain are stored in the read-only memory 49 for each acceptable coin type. These are determined in a similar way to the normal value of the amplification: first, the transistor 36 is blocked, so that the resistor 35 is not connected to the resonant circuit 6, 7. A coin of the acceptable type is then brought into the field of the coil 6. Under normal conditions, the partial resistance 11 to 18 is then gradually increased in the same way as in the determination of the normal value of the amplification until the resistance level is reached at which the oscillator vibrations cease. Two values of the partial resistance are then stored in the read-only memory 49 as normal limit values for the amplification, one of which is smaller by a tolerance and the other of which is greater than the resistance of the resistance level reached.
  • the tolerances are measured according to the allowable tolerance range of acceptable coins of the type concerned for strict testing.
  • the normal limit values of the gain can also be determined by placing a coin representing the lower and an upper limit of the tolerance range of the coin type in the field of the coil 6 and determining the resistance value of the partial resistor 11 to 18, at which the oscillator vibrations cease.
  • the circuit arrangement is put into operation by a signal from a coin detector (not shown) arranged at the entrance of the coin channel.
  • the program controller 29 acts on the transistor 36, which connects the resistor 35 in parallel with the resonant circuit 6, 7.
  • the program controller 29 then triggers the operations of a first program section described below, which are ended before the inserted coin enters the field of the coil 6: the partial resistor 11 to 18 is gradually increased starting from the smallest resistance value until the resistance level is reached , where the oscillator vibrations stop. If conditions other than normal prevail, the value of the partial resistor 11 to 18 corresponding to this stage is not equal to the normal value stored in the read-only memory 49. Rather, there is a deviation.
  • the arithmetic unit 69 determines the ratio of this value of the partial resistance to the normal value and multiplies the upper and lower normal limit values of the individual coin types stored in the read-only memory 49 by this ratio. As a result, relevant upper and lower limit values for coin acceptance are obtained under the prevailing conditions. For each upper limit value obtained in this way, the next resistance level lying above it, and for each lower level the next resistance level lying below it, is the upper and lower, corrected tolerance limit value of the relevant coin type for coin testing in RAM memory 59 saved. In the following, these corrected tolerance limit values are referred to as target limit values. The transistor 36 is then blocked. This concludes the first part of the program.
  • the coin belongs to an acceptable coin type if the oscillator 2, 6, 7 oscillates at the lower target limit value of a coin type and does not oscillate at the upper target limit value of the same coin type.
  • the lower target limit is the smaller resistance value, it causes a greater degree of amplification).
  • the coin belongs to an acceptable coin type if the resistance level at which the oscillator vibrations are between the lower and upper nominal value of a coin type.
  • test in case a) has the advantage that it takes place much faster than in case b).
  • the oscillator 2, 6, 7 oscillates in the idle state and the partial resistance 11 to 18 is increased in stages.
  • the oscillator could not oscillate in the idle state and the partial resistance, starting with the largest resistance value (or the largest stored target limit value), could be gradually reduced until the resistance level at which the oscillator vibrations set in is reached. The gain would not be gradually reduced, but rather increased.
  • the circuit arrangement according to FIG. 2 differs from that according to FIG. 1 by the circuit part drawn with a dash-dotted line.
  • the feedback path 4, 5 is omitted and the operational amplifier 2 is inductively coupled to the coil 42 of an AC generator (or oscillator) 43, which forms a primary coupling element, by a coil 41 forming a secondary coupling element.
  • the coin 37 gets into the coupling field between the two coils 41, 42 and changes the degree of coupling.
  • the transmitted signal passes through a capacitor 44 to the amplifier input 3.
  • the comparator 30 compares the amplitude of the output signal of the amplifier 2 with the reference voltage at the output 31 and emits signals to the program controller 29 in time with the upper half-wave of the transmitted and amplified AC signal until the signal amplitude with a corresponding reduction in the degree of coupling falls below the reference voltage (the threshold value). Otherwise, the circuit arrangement according to FIG. 2 operates in accordance with the circuit arrangement according to FIG. 1: A normal value of the gain is likewise stored in the read-only memory 49.
  • partial resistor 11 to 18 is gradually increased, starting with the smallest resistance value, until the resistance level and thus the gain level is reached, at which the amplitude of the output signal of amplifier 2 is equal to Comparison voltage at the output 31 is or falls below this.
  • the resistance value of the resistance level reached is then stored as the normal value of the amplification.
  • two predetermined normal limit values of the amplification or the partial resistance 11 to 18 are stored for each type of coin, between which the amplitude of the output signal of the amplifier 2 assumes the reference voltage for an acceptable coin 37.
  • the coin check is then also analogous to that described above, in that the program controller 29 gradually increases the partial resistance 11 to 18 before the coin check until the output signal amplitude of the amplifier 2 assumes or falls below the reference voltage.
  • the arithmetic unit 69 then multiplies the quotient from the value of the partial resistance 11 to 18 thus obtained and the normal value by the lower and upper normal limit values stored in the read-only memory 49 for each coin type. For each lower and upper limit value calculated in this way, the next resistance level below and above it is stored in RAM memory 59 as the lower and upper target limit value of the coin type in question. During coin testing, the partial resistance 11 to 18 is then also gradually increased.
  • a coin acceptance signal is emitted if the output signal amplitude of the amplifier 2 assumes the comparison voltage at the output 31 when the value of the resistance level reached lies between the two target limit values. If only the target limit values of the resistance levels stored in the RAM memory 59 are run through from bottom to top, a coin acceptance signal is emitted if the amplitude of the amplifier output signal exceeds the reference voltage for the smaller of the two resistance target limit values of a coin type and falls below it for the larger one. Of course, the partial resistance could also be gradually reduced starting with the greatest resistance value.
  • the accuracy of the coin check in the described embodiments does not depend on any external influences, it is only limited by the number of gain values that can be set by the resistors 11 to 18. A slight increase in the number of resistors 11 to 18 (and the corresponding switching transistors 21-28) achieved a considerable increase in the adjustable gain values and thus the accuracy.
  • the resistors 11 to 18 could of course also be connected to the feedback path of the oscillator instead of to the negative feedback path.
  • the advantage of the arrangement in the negative feedback path is that the quality of the resonant circuit is not influenced, which is essential for an accurate, selective coin check.
  • the gain could be controlled by capacitors instead of resistors 11 to 18.
  • an oscillator circuit with two coupled oscillating circuits could also be provided, in the coupling field of which the coin arrives.
  • the circuit could also be designed so that the oscillator vibrations start when an acceptable coin gets into the coil field.
  • the first part of the program described in connection with FIG. 1 can be shortened by gradually increasing the partial resistance 11 to 18 instead of the smallest resistance value with a larger resistance value which is selected so that the oscillator vibrations even under the most extreme conditions (temperature. not heavily soiled coin channel).
  • predetermined normal limit values and a predetermined normal value of the gain can be stored in the ROMs 49 during the manufacture of the coin validators for the entire series of coin validators.
  • the value of the partial resistor 11 to 18 is determined in the manner described there, at which the oscillator oscillations cease when the resistor 35 is connected in parallel to the resonant circuit 6, 7 and no coin in the coil field 6 is.
  • the arithmetic logic unit 69 only determines the difference between this value and the predetermined normal value stored in the ROM 49 and stores this difference as a correction value in RAM 59. (No target limit values are therefore yet calculated).
  • arithmetic logic unit 69 successively determines all target limit values by adding the correction value stored in ram 59 to the word-determined normal limit values stored in ROM 49. Immediately after each calculation of a target limit value, the corresponding resistance level 11 to 18 is set and it is determined in the manner described above whether the oscillator vibrations stop.

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
  • Pinball Game Machines (AREA)
  • Telephone Function (AREA)
  • Adornments (AREA)
  • Slot Machines And Peripheral Devices (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Claims (4)

1. Circuit pour l'examen de pièces de monnaie, comportant un circuit oscillant (6, 7 ; 41, 44) influencé par la monnaie (37) devant être examinée et dont les oscillations sont amplifiées par un amplificateur (2), ainsi qu'un dispositif (29) de commande de programme, qui agit sur l'amplification de cet amplificateur et présente une mémoire (39) dans laquelle deux valeurs limites de tolérance de l'amplification sont respectivement programmées pour chaque type de monnaie devant être examiné, un signal d'acceptation de monnaie étant délivré lorsque la tension de sortie de l'amplificateur (2) est plus grande qu'une valeur de seuil en présence de l'une des valeurs limites de tolérance d'un type de monnaie et plus petite que cette valeur de seuil en présence de l'autre valeur limite, caractérisé par le fait qu'une valeur normale de l'amplification est stockée dans la mémoire (39), valeur en présence de laquelle la tension de sortie dépasse négativement ou positivement la valeur de seuil lorsque le circuit oscillant (6, 7 ; 41, 44) n'est pas influencé et le dispositif (29) de commande de programme détermine avant chaque examen de monnaie, par une variation par pas de l'amplification, la valeur de l'amplification en présence de laquelle la tension de sortie dépasse négativement ou positivement la valeur de seuil, et forme deux valeurs limites respectives corrigées de tolérance de l'amplification à partir du rapport de la valeur de l'amplification ainsi déterminée à la valeur normale et des deux valeurs limites de tolérance de chaque type de monnaie, l'amplification, au cours de l'examen de monnaie proprement dit lors duquel la monnaie (37) influence le circuit oscillant (6, 7 ; 41, 44), étant de nouveau modifiée par pas soit d'une manière correspondant aux valeurs limites de tolérance corrigées, soit selon d'autres pas, le signal d'acceptation de monnaie étant délivré, dans le premier cas, lorsque la tension de sortie est plus grande que la valeur de seuil en présence de l'une des valeurs limites de tolérance corrigées d'un type de monnaie et plus petite que cette valeur de seuil en présence de l'autre valeur limite et, dans le tout dernier cas, lorsque l'amplification en présence de laquelle la tension de sortie dépasse négativement ou positivement la valeur de seuil se situe entre les deux valeurs limites de tolérance corrigées d'un type de monnaie.
2. Circuit selon la revendication 1, caractérisé par le fait qu'une résistance (35) peut être raccordée au circuit oscillant (6, 7; 41, 44) au moyen d'un transistor de commutation (36), cette résistance (35) étant calculée de façon qu'elle provoque approximativement la même atténuation du circuit oscillant (6, 7 ; 41, 44) qu'une monnaie acceptable (37) et que la valeur normale de l'amplification stockée dans la mémoire (39) soit la valeur en présence de laquelle la tension de sortie dépasse négativement ou positivement la valeur de seuil lorsque ladite résistance (35) est raccordée audit circuit oscillant (6, 7 ; 41, 44) ; et par le fait que la résistance (35) est raccordée au circuit oscillant (6, 7 ; 41, 44) avant chaque examen de monnaie lors de la variation par pas de l'amplification et n'est pas connectée addition- nellement au cours de l'examen de monnaie proprement dit.
3. Circuit selon la revendication 1 ou 2, caractérisé par le fait que plusieurs résistances (11-18) ou condensateurs peuvent, par l'intermédiaire d'un transistor respectif de commutation (21-28) commandé par le dispositif (29) de commande de programme, être enclenchés individuellement et en combinaisons, parallèlement les uns aux autres, dans un trajet de contre-réaction de l'amplificateur (2).
4. Circuit selon l'une des revendications 1 à 3, caractérisé par le fait qu'un détecteur (30) de valeurs de seuil, relié au dispositif (29) de commande, est raccordé à la sortie (1) de l'amplificateur (2).
EP81109571A 1980-12-05 1981-11-07 Circuit pour l'examen de pièces de monnaie Expired EP0053735B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109571T ATE15288T1 (de) 1980-12-05 1981-11-07 Schaltungsanordnung in einem muenzpruefer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8979/80 1980-12-05
CH897980 1980-12-05

Publications (2)

Publication Number Publication Date
EP0053735A1 EP0053735A1 (fr) 1982-06-16
EP0053735B1 true EP0053735B1 (fr) 1985-08-28

Family

ID=4346979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109571A Expired EP0053735B1 (fr) 1980-12-05 1981-11-07 Circuit pour l'examen de pièces de monnaie

Country Status (10)

Country Link
US (1) US4492296A (fr)
EP (1) EP0053735B1 (fr)
AT (1) ATE15288T1 (fr)
AU (1) AU7797181A (fr)
CA (1) CA1169940A (fr)
DE (1) DE3172063D1 (fr)
GB (1) GB2090034B (fr)
NO (1) NO814162L (fr)
YU (1) YU284081A (fr)
ZA (1) ZA818443B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK158418C (da) * 1985-11-27 1990-10-22 Standard Electric Kirk Fremgangsmaade til identificering af moenter og apparat til brug ved udoevelse af fremgangsmaaden
JPH0546127Y2 (fr) * 1986-12-29 1993-12-01
US4936435A (en) * 1988-10-11 1990-06-26 Unidynamics Corporation Coin validating apparatus and method
JPH0731324Y2 (ja) * 1989-04-21 1995-07-19 サンデン株式会社 硬貨判別装置
US5293979A (en) * 1991-12-10 1994-03-15 Coin Acceptors, Inc. Coin detection and validation means
GB2310070B (en) * 1996-02-08 1999-10-27 Mars Inc Coin diameter measurement
US10742206B2 (en) * 2018-11-21 2020-08-11 Dialog Semiconductor (Uk) Limited Switching circuit

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH546451A (de) * 1970-12-04 1974-02-28 Autelca Ag Muenzpruefer.
US3749220A (en) * 1971-10-06 1973-07-31 Anritsu Electric Co Ltd Coin discriminating apparatus
FR2305809A1 (fr) * 1975-03-25 1976-10-22 Crouzet Sa Dispositif d'authentification de titres monetaires
US4105105A (en) * 1975-10-17 1978-08-08 Libandor Trading Corporation Inc. Method for checking coins and coin checking apparatus for the performance of the aforesaid method
FR2353910A1 (fr) * 1976-06-02 1977-12-30 Affranchissement Timbrage Auto Discriminateur logique de pieces de monnaie
FR2359468A2 (fr) * 1976-07-23 1978-02-17 Crouzet Sa Nouveau selecteur de pieces de monnaie pour distributeurs automatiques
DE2723516A1 (de) * 1977-05-25 1978-12-07 Braum Ludwig Verfahren zur pruefung von muenzen o.dgl. sowie muenzpruefer zur durchfuehrung des verfahrens
FR2408183A1 (fr) * 1977-11-03 1979-06-01 Signaux Entr Electriques Controleur de pieces metalliques, et notamment de pieces de monnaie
US4326621A (en) * 1979-03-15 1982-04-27 Gaea Trade And Development Company Limited Coin detecting apparatus for distinguishing genuine coins from slugs, spurious coins and the like
US4286704A (en) * 1979-04-27 1981-09-01 Coin Controls Limited Coin-validating arrangement
ZA821411B (en) * 1981-03-19 1983-02-23 Aeronautical General Instr Coin validation apparatus

Also Published As

Publication number Publication date
DE3172063D1 (en) 1985-10-03
AU7797181A (en) 1982-06-10
ZA818443B (en) 1982-10-27
YU284081A (en) 1983-06-30
US4492296A (en) 1985-01-08
NO814162L (no) 1982-06-07
CA1169940A (fr) 1984-06-26
GB2090034B (en) 1984-08-30
EP0053735A1 (fr) 1982-06-16
ATE15288T1 (de) 1985-09-15
GB2090034A (en) 1982-06-30

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