EP0155126B2 - Selbstabstimmendes Münzerkennungssystem - Google Patents

Selbstabstimmendes Münzerkennungssystem Download PDF

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Publication number
EP0155126B2
EP0155126B2 EP85301409A EP85301409A EP0155126B2 EP 0155126 B2 EP0155126 B2 EP 0155126B2 EP 85301409 A EP85301409 A EP 85301409A EP 85301409 A EP85301409 A EP 85301409A EP 0155126 B2 EP0155126 B2 EP 0155126B2
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EP
European Patent Office
Prior art keywords
coin
sensor
test
acceptable
coins
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EP85301409A
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English (en)
French (fr)
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EP0155126B1 (de
EP0155126A3 (en
EP0155126A2 (de
Inventor
Frederic P. Heiman
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Mars Inc
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Mars Inc
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Priority to AT85301409T priority Critical patent/ATE61136T1/de
Publication of EP0155126A2 publication Critical patent/EP0155126A2/de
Publication of EP0155126A3 publication Critical patent/EP0155126A3/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
    • G07D5/08—Testing the magnetic or electric properties
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G07D5/02—Testing the dimensions, e.g. thickness, diameter; Testing the deformation

Definitions

  • the present invention relates to the examination of coins for authenticity and denomination, and more particularly to an adjustment-free self-tuning mechanism for coin testing.
  • WO-A-80/01963 discloses an apparatus for distinguishing test items, particularly banknotes. Each measurement of a test item is statistically processed with measurements for earlier items to calculate a mean value and a dispersion value, these being used to set limit values to determine whether a subsequently tested item is genuine.
  • initial limits are set rather wide so that virtually 100% acceptance of all genuine 5-cent coins is assured.
  • acceptable coins are inserted into the apparatus and are tested by one or more sensors.
  • a statistical function of the parameter measured by each sensor is computed. For example, a running average of the parameter can be computed.
  • a new acceptance limit is automatically established by the electronic coin testing apparatus.
  • the new acceptance limits can be set at the running average plus or minus a stored, preestablished constant or a stored, preestablished percentage of the running average.
  • standard initial acceptance limits are not stored and tuning is begun by transmitting an instruction signal that the apparatus is to be tuned for a particular coin such as the 5-cent coin.
  • a predetermined number of valid 5-cent coins are inserted and tested.
  • a single test coin representative of the average 5-cent coin may be used.
  • a statistical function is computed and acceptance limits are set based thereon.
  • the process is repeated for additional denominations of coins which are to be accepted. In either case, the initial factory tuning is accomplished by merely inserting a predetermined number of valid coins.
  • the statistical function is continuously recomputed by the electronic coin testing apparatus as additional acceptable coins are inserted. In order to compensate for environmental changes such as a change of temperature or humidity after a large number of coins have been accepted, the coin testing apparatus reweights the computation so that the computation of the statistical function is based upon information for only a predetermined number of the most recently inserted and accepted coins.
  • the self-tuning feature of a coin testing apparatus has the advantage of significantly reducing the time and skill required to originally tune the coin testing apparatus in the factory, thereby reducing the costs of labor used in the manufacturing process. Further, such apparatus continuously retunes itself during normal operation thereby compensating for parameter drift and environmental changes.
  • the coin examining method and apparatus of this invention may be applied to a wide range of electronic coin tests for measuring a parameter indicative of a coin's acceptability and to the identification and acceptance of any number of coins from the coin sets of many countries, the invention will be adequately illustrated by explanation of its application to identifying the U.S. 5-cent coin.
  • the following description concentrates on the details for setting the acceptance limits for a high frequency diameter test for U.S. 5-cent coins, but the application of the invention to other coin tests for U.S. 5-cent coins, such as a high frequency thickness test, and to other coins will be clear to those skilled in the art.
  • Fig. 1 shows a block schematic diagram of an electronic coin testing apparatus 10 in accordance with the present invention.
  • the mechanical portion of the electronic coin testing apparatus 10 is shown in Fig. 3.
  • the electronic coin testing apparatus 10 includes two principal sections: a coin examining and sensing circuit 20 including individual sensor circuits 21, 22 and 23, and a processing and control circuit 30.
  • the processing and control circuit 30 includes a programmed microprocessor 35, an analog to digital (A/D) converter circuit 40, a signal shaping circuit 45, a comparator circuit 50, a counter 55, and NOR-gates 61, 62, 63, 64 and 65.
  • A/D analog to digital
  • Each of the sensor circuits 21, 22 includes a two-sided inductive sensor 24, 25 having its series connected coils located adjacent opposing sidewalls of a coin passageway. As shown in Fig. 3, sensor 24 is preferably of a large diameter for testing coins of wideranging diameters.
  • Sensor circuit 23 includes an inductive sensor 26 which is preferably arranged as shown in Fig. 3.
  • Sensor circuit 21 is a high frequency low power oscillator used to test coin parameters, such as diameter and material, and to "wake up" the microprocessor 35.
  • the frequency and amplitude of the output of sensor circuit 21 change as a result of coin interaction with the sensor 24.
  • This output is shaped by the shaping circuit 45 and fed to the comparator circuit 50.
  • the comparator circuit 50 produces an output on line 36 which is conected to the interrupt pin of microprocessor 35.
  • a signal on line 36 directs the microprocessor 35 to "wake up” or in other words, to go from a low power idling or rest state to a full power coin evaluation state.
  • the electronic coin testing apparatus 10 may be employed in a coin operated telephone or other environment in which low power operation is very important. In such environments, the above described wake up feature is particularly useful.
  • the above described "wake up" is only one possible way for powering up upon detecting coin arrival. For examples a separate arrival detector could be used to detect coin arrival and wake up the microprocessor.
  • the output from shaping circuit 45 is also fed to an input of the A/D converter circuit 40 which converts the analog signal at its input to a digital output.
  • This digital output is serially fed on line 42 to the microprocessor 35.
  • the digital output is monitored by microprocessor 35 to detect the effect of a passing coin on the amplitude of the output of sensor circuit 21. In conjunction with frequency shift information, the amplitude information provides the microprocessor 35 with adequate data for particularly reliable testing of coins of wideranging diameters using a single sensor 21.
  • the output of sensor circuit 21 is also connected to one input of NOR gate 61 the output of which is in turn connected to an input of NOR gate 62.
  • NOR gate 62 is connected as one input of NOR gate 65 which has its output connected to the counter 55.
  • Frequency related information for the sensor circuit 21 is generated by selectively connecting the output of sensor circuit 21 through the NOR gates 61, 62 and 65 to the counter 55.
  • Frequency information for sensor circuits 22 and 23 is similarly generated by selectively connecting the output of either sensor circuit 22 or 23 through its respective NOR gate 63 or 64 and the NOR gate 65 to the counter 55.
  • Sensor circuit 22 is also a high frequency low power oscillator and it is used to test coin thickness.
  • Sensor circuit 23 is a strobe sensor commonly found in vending machines.
  • the sensor 26 is located after an accept gate 71.
  • the output of sensor circuit 23 is used to control such functions as the granting of credit, to detect coin jams and to prevent customer fraud by methods such as lowering an acceptable coin into the machine with a string.
  • the microprocessor 35 controls the selective connection of the outputs from the sensor circuits 21, 22 and 23 to counter 55 as described below.
  • the frequency of the oscillation at the output of the sensor circuits 21, 22 and 23 is sampled by counting the threshold level crossings of the output signal occurring in a predetermined sample time. The counting is done by the counter circuit 55 and the length of the predetermined sample time is controlled by the microprocessor 35.
  • One input of each of the NOR gates 62, 63 and 64 is connected to the output of its associated sensor circuit 21, 22 and 23.
  • the output of sensor 21 is connected through the NOR gate 61 which is connected as an inverter amplifier.
  • the other input of each of the NOR gates 62, 63 and 64 is connected to its respective control line 37, 38 and 39 from the microprocessor 35.
  • the signals on the control lines 37, 38 and 39 control when each of the sensor circuits 21, 22 and 23 is interrogated or sampled, or in other words, when the outputs of the sensor circuits 21, 22 and 23 will be fed to the counter 55.
  • microprocessor 35 produces a high (logic "1") signal on lines 38 and 39 and a low signal (logic "0") on line 37
  • sensor circuit 21 is interrogated, and each time the output of the NOR gate 61 goes low, the NOR gate 62 produces a high output which is fed through NOR gate 65 to the counting input of and counted by the counter 55.
  • Counter 55 produces an output count signal and this output of counter 55 is connected by line 57 to the microprocessor 35.
  • Microprocessor 35 determines whether the output count signal from the counter 55 and the digital amplitude information from A/D converter circuit 40 are indicative of a coin of acceptable diameter or not by determining whether the outputs of counter 55 and A/D converter circuit: 40 or a value or values computed therefrom are within stored acceptance limits. When sensor circuit 22 is interrogated, microprocessor 35 determines whether the counter output is indicative of a coin of acceptable thickness. Finally, when sensor circuit 23 is interrogated, microprocessor 35 determines whether the counter output is indicative of coin presence or absence. When both the diameter and thickness tests are satisfied, a high degree of accuracy in discrimination between genuine and false coins is achieved.
  • Fig. 2 is a detailed schematic diagram of circuitry suitable for the embodiment of Fig. 1 including the following components: Resistors R 1 820 k R 2 330 k R 3 43 k R 4 ,R 9 ,R 12 3.9 k R 5 ,R 13 ,R 28 ,R 36 1 k R 6 ,R 14 ,R 18 ,R 21 R 27 ,R 29 ,R 30 , R 31 ,R 34 ,R 38 100 k R 7 510 k R 8 680 k R 10 470 k R 11 620 k R 15 ,R 26 47 k R 16 180 k R 17 10 k R 20 390 k R 22 ,R 23 150 k R 24 ,R 37 6.8 k R 25 ,R 39 ,R 40 1 M R 35 1.5 k Inductive Sensors 24 3.5 mH 25 400 uH 26 240 uH Capacitors C 1 ,C 2 ,C 3 ,C 4 ,C 15 C 16 ,C 17 ,C 22
  • Sensor circuit 21 is a low power oscillator circuit having an inductive sensor 24 comprising two coils connected in series and located on the opposing sidewalls 36 and 38 shown in Fig. 3.
  • the two coils of sensor 24 have a combined inductance of approximately 3.5mH and the sensor circuit 21 oscillates at an idling frequency of approximately 170kHz.
  • An oscillating output signal from sensor circuit 21 is taken from point A and connected through shaping circuit 45 to A/D converter 41 and comparator circuit 50.
  • the signal at point B is the envelope of the oscillation output signal of sensor circuit 21.
  • the amplitude of the signal at the point B is approximately 3.5 volts.
  • the comparator circuit 50 produces an output on line 36 which is fed through a NOR gate and a diode to the interrupt port of microprocessor 35 and wakes up microprocessor 35. Amplitude and frequency information for diameter testing are then generated and evaluated as discussed above.
  • Sensor circuit 22 shown in detail in Fig. 2 is also an oscillator circuit and it produces frequency test information relating to the width of a coin passing sensor 25.
  • the oscillator shown in Fig. 2 has an inductive sensor 25 comprising two coils connected in series and located on the opposing side walls 36 and 38 shown in Fig. 3.
  • the two coils of sensor 25 have a combined inductance of approximately 400uH and the oscillator circuit has an idling frequency of approximately 750kHz.
  • the sensor circuit 23, the strobe sensor has its inductive sensor 26 located after a coin routing gate 71 as shown in Fig. 3.
  • the single coil of inductive sensor 26 has an inductance of approximately 240uH and sensor circuit 23 has an idling frequency of approximately 850kHz.
  • the strobe sensor is used to detect coin passage, to prevent coin jamming and customer fraud.
  • the microprocessor 35 is a CMOS device with its RAM power supply 80 backed up by a 3 volt lithium battery LB. This power arrangement provides for nonvolatile memory. Other devices including EEPROM and NOVRAM devices can be used to achieve the same result. As shown in Fig. 2, the three chips labeled 58, 59 and 60 constitute the external program memory. Where a microprocessor 35 is used which has sufficient internal memory, such as an Intel 80C49, the chips 58, 59 and 60 may be eliminated.
  • the electronic coin testing apparatus 10 is incorporated into a coin operated telephone.
  • the apparatus 10 is only powered up when the phone is off-the-hook.
  • each of the sensor circuits begins to oscillate.
  • the microprocessor 35 samples and stores idling or no coin amplitude (A o ) and frequency (f o ) values for sensor circuit 21 and frequency values for sensor circuits 22 and 23. Then, the microprocessor "goes to sleep” or enters a rest or standby mode. In this mode, it consumes very little power until an interrupt signal is produced on line 36 thereby indicating that a coin has been inserted and waking up microprocessor 35.
  • Microprocessor 35 upon being awakened is fully powered and it evaluates the information from the sensor circuits 21 and 22 and determines whether or not the detected coin is an acceptable coin.
  • a dimensionless quantity F ⁇ f/f o is then computed and compared with stored acceptance limits to see if this value of F for the coin being tested lies within the acceptability range for a valid coin.
  • this type of measurement technique also applies to parameters of a sensor output signal other than frequency, for example, amplitude.
  • the present invention is specifically applied to the setting of coin acceptance limits for particular sensors providing amplitude and frequency outputs, it applies in general to the setting of coin acceptance limits derived from a statistical function for a number of previously accepted coins of the parameter or parameters measured by any sensor.
  • the F value is stored and added to the store of information used by microprocessor 35 for computing new acceptance limits. For example, a running average of stored F values is computed for a predetermined number of previously accepted coins and the acceptance limits are established as the running average plus or minus a stored constant or a stored percentage of the running average. Both wide and narrow acceptance limits are stored in the microprocessor 35. Alternatively these limits might be stored in RAM or ROM. In the embodiment shown, whether the new acceptance limits are set to wide or narrow values is controlled by external information supplied to the microprocessor through its data communication bus. Alternatively, a selection switch connected to one input of the microprocessor 35 might be used.
  • microprocessor 35 tests for the state of the switch, that is, whether it is open or closed and adjusts the limits depending on the state of the switch.
  • the narrow range achieves very good protection against the acceptance of slugs; however, the tradeoff is that acceptable coins which are worn or damaged may be rejected.
  • the ability to select between wide and narrow acceptance limits allows the owner of the apparatus to adjust the acceptance limits in accordance with his operational experience.
  • a relay control circuit 70 for controlling the gate 71 shown in Fig. 3, a clock 75, a power supply circuit 80, interface lines 81, 82, 83 and 84, and debug line 85.
  • the microprocessor 35 can be readily programmed to control relay circuit 70 which operates a gate to separate acceptable from unacceptable coins or perform other coin routing tasks.
  • the particular details of controlling such a gate do not form a part of the present invention.
  • U.S. Patent No. 4,106,610 See also, Plesko, "Low Power Coin Routing Gate", U.S. patent No. 4534459 (corresponding to EP-A-0154525 for details of a preferred gate suitable for use in conjunction with this invention.
  • the clock 75 and power supply 80 supply clock and power inputs required by the microprocessor 35.
  • the interface lines 81, 82, 83 and 84 provide a means for connecting the electronic coin testing apparatus 10 to other apparatus or circuitry which may be included in a coin operated vending mechanism which includes the electronic coin testing apparatus 10. The details of such further apparatus and the connection thereto do not form part of the present invention.
  • Debug line 85 provides a test connection for monitoring operation and debugging purposes.
  • Fig. 3 illustrates the mechanical portion of the coin testing apparatus 10 and one way in which sensors 24, 25 and 26 may be suitably positioned adjacent a coin passageway defined by two spaced side walls 36, 38 and a coin track 33, 33a.
  • the coin handling apparatus 11 includes a conventional coin receiving cup 31, two spaced sidewalls 36 and 38, connected by a conventional hinge and spring assembly 34, and coin track 33, 33a.
  • the coin track 33, 33a and sidewalls 36, 38 form a coin passageway from the coin entry cup 31 past the coin sensors 24, 25.
  • Fig. 3 also shows the sensor 26 located after the gate 71, which in Fig. 3 is shown for separating acceptable from unacceptable coins.
  • Fig. 4 is a flowchart of the operation of the embodiment of Figs. 1-3.
  • initial acceptance limits for each test are stored in the microprocessor 35 of the electronic coin testing apparatus 10. These initial limits are set quite wide guaranteeing almost 100% acceptance of acceptable coins. These acceptance limits are used only in the original tuning.
  • a predetermined number of known acceptable coins of each denomination are inserted. For example, eight acceptable 5-cent coins are inserted. The inserted coins are detected by the sensor circuit 21, microprocessor 35 is awakened, amplitude and frequency tests are conducted for each coin using sensor circuit 21, and a second frequency test is conducted using sensor circuit 22.
  • new acceptance limits are computed based on the test information for the eight acceptable coins. These new limits are used for testing additional coins which are inserted.
  • the frequency test using sensor circuit 21 will be further discussed, but it should be understood that similar processing is performed for each test undertaken in the coin validation process.
  • Fig. 4 illustrates the process involved in the coin telephone context. It will be understood that the method and apparatus of the present invention can be used in other contexts.
  • the general method of Fig. 4 may be understood by taking all f variables as representing any function which might be tested, such as frequency, amplitude and the like, for any coin test. The specific discussion which follows will be in terms of frequency testing for United States 5-cent coins.
  • a dimensionless quantity, F is calculated by dividing ⁇ f by f o .
  • F
  • the computed F for the first 5-cent coin is compared with the stored acceptance limits to see if it lies within those limits. Since the first 5-cent coin is an acceptable 5-cent coin, its F value is within the limits.
  • the first 5-cent coin is accepted and microprocessor 35 obtains a coin count C for that coin.
  • F AVE NEW and new acceptance limits are continually recomputed. If a coin other than an acceptable 5-cent coin is inserted, its F value will not be within the acceptance limits and that coin will be rejected. After that occurs, a new idling frequency, f o , is measured and then microprocessor 35 returns to a rest state to await coin arrival.
  • the method of the present invention is not limited to frequency based testing. Neither is the statistical function limited solely to a running average.
  • the specific example of the flowchart discussed above uses the numbers 8, 16 and 32 in the computation process, other predetermined numbers may be used without departing from the present invention.
  • the values 8, 16 and 32 were selected because: a) F AVE NEW is fairly well determined after eight coins have been accepted; b) F AVE NEW becomes heavily weighted after 32 coins have been inserted so that the insertion of additional acceptable coins has little effect; and c) the number 16 is between 8 and 32.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Small-Scale Networks (AREA)
  • Noodles (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)

Claims (30)

  1. Verfahren zum Betreiben eines Münzprüfgerätes (10), bei dem eine Münze geprüft und aus dem Prüfergebnis bestimmt wird, ob die Münze akzeptierbar ist, und, falls dies so ist, der Wert der Münze bestimmt wird, wobei im Prüfschritt eine Messung für die Münze gewonnen wird und im Bestimmungsschritt entsprechende vorgegebene Akzeptanzkriterien verwendet werden, um zu bestimmen, ob die Messung eine akzeptierbare Münze eines entsprechenden Münzwertes anzeigt, wobei das Verfahren den weiteren Schritt beinhaltet, daß, wenn die Münze als akzeptierbar bestimmt wurde, das entsprechende Akzeptanzkriterium für den Münzwert um ein Maß geändert wird, das von der Messung abhängt, so daß das geänderte Akzeptanzkriterium bei einer anschließend geprüften Münze angewendet werden kann, wobei das Verfahren weiterhin den Schritt einer zusätzlichen Änderung des entsprechenden geänderten Akzeptanzkriteriums für den Münzwert beinhaltet, um zwischen relativ weiten Akzeptanzgrenzen und relativ engen Akzeptanzgrenzen auszuwählen, wobei letztere die Wahrscheinlichkeit verringern, daß münzartige Stücke akzeptiert werden und dadurch eine Änderung des jeweiligen Akzeptanzkriteriums bewirken.
  2. Verfahren nach Anspruch 1, bei dem im Prüfschritt eine Mehrzahl von Münzmessungen abgeleitet wird und im Bestimmungsschritt entsprechende vorgegebene Akzeptanzkriterien verwendet werden, um zu bestimmen, ob eine jeweilige Messung eine akzeptierbare Münze anzeigt, wobei das Verfahren den Schritt des Modifizierens jedes Akzeptanzkriteriums in einem Ausmaße aufweist, das von der entsprechenden Messung abhängt, wenn die Münze als akzeptierbar bestimmt wird.
  3. Verfahren nach einem der Ansprüche 1 oder 2, bei dem das Akzeptanzkriterium jedesmal modifiziert wird, wenn eine geprüfte Münze als akzeptierbar bestimmt wurde.
  4. Verfahren nach einem der vorangehenden Ansprüche, bei dem der Schritt des Modifizierens des Akzeptanzkriteriums das Berechnen eines statistischen Funktionswertes aus der Münzenmessung beinhaltet.
  5. Verfahren nach Anspruch 4, bei dem der Berechnungsschritt das Berechnen eines laufenden Mittelwerts aus den Messungen von Münzen beinhaltet, die als akzeptierbar bestimmt wurden.
  6. Verfahren nach Anspruch 5, bei dem der laufende Mittelwert gewichtet wird, um den Effekt der Messungen zuvor geprüfeter Münzen zu verringern.
  7. Verfahren nach einem der vorstehenden Ansprüche, bei dem im Schritt des Modifizierens des Akzeptanzkriteriums Akzeptanzgrenzen zum Anwenden auf eine anschließend geprüfete Münze berechnet werden und die berechneten Akzeptanzgrenzen gespeichert werden, wodurch die Messung der anschließend geprüften Münze mit den gespeicherten Akzeptanzgrenzen verglichen werden kann.
  8. Verfahren nach einem der vorstehenden Ansprüche mit einem Einstellablauf, bei dem eine Mehrzahl von Münzen geprüft wird und mit einem Anfangsakzeptanzkriterium bestimmt wird, ob diese akzeptierbar sind, ein statistischer Funktionswert aus den Messungen der als akzeptierbar bestimmten Münzen berechnet wird und ein neues aus dem berechneten statistischen Funktionswert abgeleitetes Akzeptanzkriterium verwendet wird, nachdem eine vorgegebene Anzahl von Münzen als akzeptierbar bestimmt wurde.
  9. Verfahren nach einem der Ansprüche 1 bis 7 mit einem Einstellablauf, bei dem eine vorgegebene Anzahl von Münzen eines bekannten Werts geprüft wird, um Messungen für die Münzen abzuleiten, ein statistischer Funktionswert aus den Messungen berechnet wird und ein Akzeptanzkriterium aus dem statistischen Funktionswert abgeleitet wird.
  10. Verfahren nach einem der Ansprüche 1 bis 7 mit einem Einstellablauf, bei dem eine einzige Münze bekannten Wertes geprüft wird, um hieraus eine Messung abzuleiten, und ein Anfangsakzeptanzkriterium aus dieser Messung berechnet wird.
  11. Gerät zum Prüfen von Münzen mit:
    einer Prüfeinrichtung (20) zum Erzeugen eines Ausgangssignals, das eine Eigenschaft einer geprüften Münze anzeigt;
    einer Speichereinrichtung zum Speichern von zu den entsprechenden Münzwerten zugehörigen Prüfgrenzen;
    einer Einrichtung (35, 40, 55) zum Ableiten eines Prüfwertes aus dem Ausgangssignal; und
    einer Einrichtung zum Bestimmen, ob die geprüfte Münze akzeptierbar ist, und, falls dies der Fall ist, des Münzwerts, wobei diese Bestimmungseinrichtung betätigbar ist, um den Prüfwert mit den gespeicherten Prüfgrenzen zu vergleichen;
    eine Einrichtung zum Wiederberechnen der einem Münzwert zugehörigen Prüfgrenzen, wenn bestimmt wird, daß die geprüfte Münze eine akzeptierbare Münze dieses Wertes ist, so daß die wiederberechneten Prüfgrenzen für eine folgende Münze verwendet werden können; und
    eine Vorrichtung zum Auswählen zwischen relativ weiten und relativ engen wiederberechneten Prüfgrenzen, wobei letztere die Wahrscheinlichkeit verringern, daß mümzartige Stücke akzeptiert werden und dadurch eine Modifikation des jeweiligen Akzeptanzkriterium bewirken.
  12. Gerät nach Anspruch 11, bei dem die Prüfeinrichtung (20) eine Sensorschaltung (21, 22) mit einem Sensor (24, 25) aufweist, der benachbart zu einem Münzweg angeordnet ist, um ein Ausgangssignal zu erzeugen, das eine Eigenschaft einer geprüften Münze auf dem Münzweg benachbart zum Sensor (24, 25) anzeigt.
  13. Gerät nach Anspruch 12, bei dem die Sensorschaltung (21, 22) eine Oszillatorschaltung ist, die ein Schwingungsausgangssignal erzeugt.
  14. Gerät nach Anspruch 13, bei dem die Einrichtung (40, 55) zum Ableiten eines Prüfwertes aus dem Ausgangssignal eine Analog/Digital-Wandlerschaltung (40) aufweist, zum Erzeugen eines digitalen Ausgangssignals, das mit der Amplitude des Schwingungsausgangssignals zusammenhängt.
  15. Gerät nach einem der Ansprüche 13 oder 14, bei dem die Einrichtung (40, 55) zum Ableiten eines Prüfwerts aus dem Ausgangssignal eine Zählerschaltung (55) aufweist, zum Erzeugen eines digitalen Ausgangszählwerts, der mit der Frequenz der Schwingung des Schwingungsausgangssignals zusammenhängt.
  16. Gerät nach einem der Ansprüche 11 bis 15, bei dem die Einrichtung zum Bestimmen und die Einrichtung zum Wiederberechnen einen programmierten Mikroprozessor (35) aufweisen.
  17. Gerät nach Anspruch 16, bei dem der programmierte Mikroprozessor (35) die wiederberechnete Prüfgrenze jedesmal speichert, wenn eine Münze als akzeptierbar befunden wird.
  18. Gerät nach einem der Ansprüche 11 bis 17, das weiterhin eine Einrichtung aufweist, zum Schalten des Geräts in eine Prüfgrenzen-Einstellbetriebsart, in der mindestens eine bekannte akzeptierbare Münze eingeführt wird, und das Gerät (10) zum Prüfen von Münzen daraus Anfangsprüfgrenzen ableitet.
  19. Gerät nach einem der Ansprüche 11 bis 18, bei dem die Wiederberechnungseinrichtung wiederholt betätigbar ist, um die Münzprüfgrenzen wiederzuberechnen, wenn Münzen akzeptiert werden, so das nachfolgend eingeführte Münzen aufgrund von Information aus einer Mehrzahl, in jüngster Zeit zuvor eingeführter Münzen, die akzeptiert wurden, geprüft werden.
  20. Gerät nach einem der Ansprüche 11 bis 19, bei dem die Prüfeinrichtung (20) einen elektromagnetischen Sensor (24; 25) aufweist.
  21. Gerät nach einem der Ansprüche 11 bis 20 mit einer Münzspur (33, 33a), entlang der Münzen auf ihrem Rand an der Prüfeinrichtung (20) vorbeirollen.
  22. Gerät nach Anspruch 11, aufweisend:
    eine Münzaufnahmeschale (31) zum Leiten einer Münze, die in die Schale (31) hineingegeben wurde, zu einem Münzdurchlaufweg (33, 33a, 36, 38);
    einen Münzsensor (24; 25) der Prüfeinrichtung (20), der benachbart zu einem ersten Ort entlang dem Münzdurchlaufweg (33, 33a, 36, 38) angeordnet ist, welcher Münzdurchlaufweg dazu dient, die Münze von der Münzaufnahmeschale (31) zu dem ersten Ort zu lenken, und wobei der Münzsensor (24; 25) ein Ausgangssignal erzeugt, wenn die Münze zum Münzsensor (24; 25) benachbart ist, das anzeigt, ob die Münze eine akzeptierbare Münze ist oder nicht;
    ein Münzleittor (71), das benachbart zu einem zweiten Ort entlang des Münzdurchlaufwegs (33, 33a, 36, 38) stromab vom ersten Ort angeordnet ist, welches Münzleittor (71) dazu dient, die Münze zu leiten;
    eine Einrichtung (70) zum physischen Steuern der Stellung des Münzleittors (71); und
    eine Verarbeitungseinrichtung (35), die die Bestimmungseinrichrichtung, die Wiederberechnungseinrichtung und die Speichereinrichtung enthält, welche Bearbeitungseinrichtung (35) mit dem Münzsensor (24, 25) und der Einrichtung (70) zum physischen Steuern der Stellung des Münzleittors (71) verbunden ist, um das Ausgangssignal vom Münzsensor (24; 25) zu empfangen, um die Münzprüfgrenzen von der Speichereinrichtung zu gewinnen, um einen Münzprüfwert auf Grundlage des Ausgangssignals vom Münzsensor (24; 25) zu berechnen, wenn sich die Münze benachbart zum Münzsensor (24; 25) befindet, zum Bestimmen, ob die Münze eine erste Eigenschaft einer akzeptierbaren Münze aufweist, auf Grundlage eines Vergleichs des Münzprüfwertes mit den Münzprüfgrenzen, und zum automatischen Benutzen des Münzprüfwerts, um die Münzprüfgrenzen, wie sie in der Speichereinrichtung gespeichert sind, zu ändern, wenn die Münze eine akzeptierbare Münze ist.
  23. Gerät nach Anspruch 22, bei dem der Münzsensor (24) einen induktiven Sensor aufweist, um den Durchmesser und das Material der Münze zu erfassen.
  24. Gerät nach Anspruch 23, bei dem der induktive Sensor (24) zwei Wicklungen aufweist, die in Reihe geschaltet sind, eine kombinierte Induktivität von etwa 3,5 mH aufweisen und die Teil einer Hochfrequenz-Niederleistungs-Oszillatorschaltung (21) mit einer Leerlauffrequenz von etwa 170 kHz sind.
  25. Gerät nach einem der Ansprüche 23 oder 24, bei dem die Verarbeitungseinrichtung (35) auf Änderungen sowohl in der Amplitude wie auch der Frequenz des Ausgangssignals vom Münzsensor (24) zum Zweck der Bestimmung, ob die Münze zwei Eigenschaften einer akzeptierbaren Münze aufweist, anspricht.
  26. Gerät nach Anspruch 25, bei dem die Verarbeitungseinrichtung (35) weiterhin auf eine Änderung in der Amplitude des Ausgangssignals anspricht, die einen vorgegebenen Wert übersteigt, um sich selbst von einem Niederleistungs-Leerlaufszustand in einen Volleistungs-Prüfzustand zu schalten.
  27. Gerät nach Anspruch 22, bei dem der Münzsensor (25) einen induktiven Sensor zum Ermitteln der Münzdicke aufweist.
  28. Gerät nach Anspruch 27, bei dem der induktive Sensor (25) zwei Wicklungen aufweist, die in Reihe geschaltet sind, eine kombinierte Induktivität von etwa 400 µH aufweisen und Teil einer Hochfrequenz-Niederleistungs-Oszillatorschaltung (22) mit einer Leerlauffrequenz von etwa 750 kHz bilden.
  29. Gerät nach einem der Ansprüche 22 bis 26, das weiterhin eine zweiten Münzsensor (25) aufweist, der mit der Verarbeitungseinrichtung (35) verbunden ist, und benachbart zum Münzdurchlaufweg (33, 33a, 36, 38) zwischen dem oben angegebenen Münzsensor (24) und dem Münzleittor (71) angeordnet ist.
  30. Gerät nach Anspruch 29, das weiterhin einen zusätzlichen Münzsensor (26) aufweist, der mit der Verarbeitungseinrichtung (35) verbunden ist und stromab vom Münzleittor (71) angeordnet ist.
EP85301409A 1984-03-01 1985-03-01 Selbstabstimmendes Münzerkennungssystem Expired - Lifetime EP0155126B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85301409T ATE61136T1 (de) 1984-03-01 1985-03-01 Selbstabstimmendes muenzerkennungssystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58525384A 1984-03-01 1984-03-01
US585253 1984-03-01

Publications (4)

Publication Number Publication Date
EP0155126A2 EP0155126A2 (de) 1985-09-18
EP0155126A3 EP0155126A3 (en) 1987-01-07
EP0155126B1 EP0155126B1 (de) 1991-02-27
EP0155126B2 true EP0155126B2 (de) 2001-07-11

Family

ID=24340677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85301409A Expired - Lifetime EP0155126B2 (de) 1984-03-01 1985-03-01 Selbstabstimmendes Münzerkennungssystem

Country Status (16)

Country Link
EP (1) EP0155126B2 (de)
JP (2) JPH0727585B2 (de)
KR (1) KR930007271B1 (de)
AT (1) ATE61136T1 (de)
AU (1) AU584330B2 (de)
BR (1) BR8505538A (de)
CA (1) CA1228921A (de)
DE (1) DE3581817D1 (de)
DK (1) DK502785A (de)
ES (1) ES8700886A1 (de)
GR (1) GR850518B (de)
HK (1) HK36396A (de)
IE (1) IE56794B1 (de)
MX (1) MX160403A (de)
WO (1) WO1985004037A1 (de)
ZA (1) ZA851248B (de)

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Also Published As

Publication number Publication date
AU584330B2 (en) 1989-05-25
ES8700886A1 (es) 1986-11-16
GR850518B (de) 1985-07-01
AU4110285A (en) 1985-09-24
JPH0727585B2 (ja) 1995-03-29
ATE61136T1 (de) 1991-03-15
DE3581817D1 (de) 1991-04-04
ES540860A0 (es) 1986-11-16
BR8505538A (pt) 1986-02-18
EP0155126B1 (de) 1991-02-27
HK36396A (en) 1996-03-08
KR850700280A (ko) 1985-12-26
JPS61501349A (ja) 1986-07-03
CA1228921A (en) 1987-11-03
EP0155126A3 (en) 1987-01-07
JPH04211888A (ja) 1992-08-03
IE56794B1 (en) 1991-12-18
JPH0785277B2 (ja) 1995-09-13
IE850477L (en) 1985-09-01
MX160403A (es) 1990-02-16
ZA851248B (en) 1985-11-27
WO1985004037A1 (en) 1985-09-12
DK502785D0 (da) 1985-10-31
DK502785A (da) 1986-01-02
KR930007271B1 (ko) 1993-08-04
EP0155126A2 (de) 1985-09-18

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