EP0543212B1 - Münzprüfeinrichtung zur Härtebestimmung von Münzen - Google Patents

Münzprüfeinrichtung zur Härtebestimmung von Münzen Download PDF

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Publication number
EP0543212B1
EP0543212B1 EP92118793A EP92118793A EP0543212B1 EP 0543212 B1 EP0543212 B1 EP 0543212B1 EP 92118793 A EP92118793 A EP 92118793A EP 92118793 A EP92118793 A EP 92118793A EP 0543212 B1 EP0543212 B1 EP 0543212B1
Authority
EP
European Patent Office
Prior art keywords
coin
sensor
test device
coins
output signal
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 - Lifetime
Application number
EP92118793A
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German (de)
English (en)
French (fr)
Other versions
EP0543212A1 (de
Inventor
Hans-Ulrich Cohrs
Wilfried Meyer
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.)
Crane Payment Innovations GmbH
Original Assignee
National Rejectors Inc GmbH
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6445125&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0543212(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by National Rejectors Inc GmbH filed Critical National Rejectors Inc GmbH
Publication of EP0543212A1 publication Critical patent/EP0543212A1/de
Application granted granted Critical
Publication of EP0543212B1 publication Critical patent/EP0543212B1/de
Anticipated expiration legal-status Critical
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Classifications

    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G07D5/06Testing the hardness or elasticity

Definitions

  • the invention relates to a coin testing device according to the preamble of claim 1.
  • a device in which a coin falls along a predetermined distance and strikes a piezoelectric means which is connected to a mass determination device in order to determine the mass of the coin from its impact on the piezoelectric means .
  • the mass determination device has an integrator for integrating the output signal of the piezoelectric means and for generating a signal proportional to the coin mass.
  • An impact absorption device connected to the piezoelectric means can be provided to absorb the coin impact.
  • the measurement of the intrinsic vibration of the coin can be combined with a sensor, which is the striking means, so that the output signal of the sensor, which can have a piezoelectric element, with the other coin information is used for coin recognition.
  • a sensor which is the striking means
  • the output signal of the sensor which can have a piezoelectric element
  • Different coin types can be distinguished on the basis of different voltage peaks and the voltage curve of the output signal.
  • Such test devices with mass and resonance frequency determination are known from EP-A 0 318 229 and EP-A 0 356 582.
  • the coin validation device described in DE-GM 90 13 836 therefore provides as a coin acceptance criterion to determine the gradient of at least part of the output signal generated by the impact of a coin on a sensor by means of a differentiating circuit and to compare it with a predetermined value.
  • an energy absorbing element is provided, the material of the element being selected so that the momentum of the coin is essentially absorbed in order to prevent the coin from jumping up.
  • the impact of the coin on the element causes vibration not only in the element itself, but also in the surrounding parts of the test device.
  • the acceptance criterion is the coin mass and / or the coin properties which influence the natural vibration of the coin. These jointly recorded properties include the weight, thickness, size and material of the coin.
  • the disadvantage is that false coins that are identical in weight to the originals in question cannot be reliably recognized. If the thickness and the diameter of the counterfeit coin also match a real coin, a distinction with the known test facilities is no longer guaranteed.
  • the invention is therefore based on the object of providing a coin testing device for determining the hardness of coins which reliably distinguishes false and genuine coins, the hardness measurement not being significantly influenced by the other coin properties such as weight, diameter, thickness or embossing.
  • the coin checking device has a sensor on which the coin strikes and evaluation electronics, the stop face of the sensor being designed according to claim 1.
  • the duration of contact of the coin with the stop surface of the sensor serves as a criterion for the hardness determination, the evaluation electronics determining the time period that lies between the original value of the output signal of the sensor when the coin was struck and a re-approximation of the output signal to the original value, and compares this period with a given value.
  • the time period resulting from the time the coin was struck on the sensor and the time the coin jumped off the sensor is a reliable measure of the hardness of the coin, since this time period is essentially determined by the elastic and, in the case of very soft materials such as lead, also plastic coin behavior, or by the spring constant of the coin and by the predetermined spring constant of the sensor.
  • This period is detected by determining the approximation of the output signal to the original value that was present at the time the coin was struck on the sensor.
  • the hardness of the stop surface of the sensor must be sufficiently high, at least greater than that of the coin material, so that the coin vibration generated and detected by the sensor is largely dependent on the coin hardness and only to a small extent on other factors such as coin weight, speed or sensor geometry.
  • the striking of the coin against the sensor can be an impact on the sensor after the coin has fallen freely or a striking after the movement of the coin, e.g. along an inclined plane.
  • the senor has a piezoelectric element, the voltage generated by a mechanical force being tapped.
  • This output signal can be fed via a circuit to an amplifier to which a known electronic evaluation system is connected, which covers the period between the First zero voltage at the time the coin strikes the sensor and a second zero voltage at the time the coin jumps off the sensor.
  • known means such as data converter, memory, comparator and microprocessor being used.
  • Another embodiment of the invention provides for an electrically conductive film to be arranged adjacent to the sensor in the coin channel.
  • the film is connected to a high-frequency generator, so that an RF voltage generated by the generator can be capacitively coupled to the coin via the film.
  • the sensor is a contact pin that is connected to a resistor. For the duration of the galvanic contact between the coin and the contact pin, the voltage coupled to the coin at the resistor 14 drops. This period serves as a hardness criterion and is determined by the evaluation electronics described further above after rectifying the voltage by means of a rectifier.
  • the stop surface of the sensor can be point-shaped or line-shaped, so that the contact surface "sensor coin” is minimized.
  • the stop surface can be, for example, a steel ball that the coin hits, or an upper section of the contact pin.
  • the sensor can be supported on a counter block, eg a steel block.
  • a further embodiment of the invention provides that the sensor at least partially protrudes into the coin track representing an inclined plane, so that different coin insertion speeds are at least partially compensated for.
  • the coin checking device can reliably distinguish false coins, which consist, for example, of relatively soft material such as lead or a lead alloy, from original coins made of relatively hard material, for example CuNi 25.
  • the time period determined by the evaluation electronics is about 2 to 6 times longer in the first case than in the second case, whereas the influence of coin mass, speed and sensor geometry moves within 1/3 of the measurement signal. This means that the hardness of the coin material is clearly determined, which guarantees a reliable separation of originals and counterfeits.
  • Fig. 1 shows a coin 1, which rolls down a coin track 2.
  • a piezoelectric element 5 is arranged below the steel ball, which is firmly connected to the steel ball and is itself supported on a counter block 6 made of steel.
  • the evaluation electronics determines the period t1-t0, where t0 is the time when the coin hits the sensor 3, and t1 the time when the coin jumps off the steel ball 4.
  • the measured period of time is compared with a predetermined value, an acceptance signal for the tested coin being generated as a function of this comparison and the acceptance criterion being the coin hardness.
  • an electrically conductive film 10 is arranged in the area of a sensor 3 '.
  • the sensor 3 ' is a contact pin which protrudes with its stop surface 11 into the coin track.
  • the contact pin is based on a counter block 6 '.
  • an RF voltage generated by an RF generator 12 (FIG. 5) is capacitively coupled onto the coin via the film 10. If the coin touches the contact pin 3 ', the voltage coupled to the coin drops across a resistor 13 for the duration of the galvanic contact between the coin and the contact pin. This voltage is rectified by means of a rectifier 14, as a result of which the voltage curve according to FIG. 6 arises.
  • an electronic evaluation unit 9 ' determines the period t0 to t i , which corresponds to the contact time of the coin 1' with the stop surface 11 of the sensor 3 '. The further evaluation takes place as described above for the first embodiment. Likewise, the measured periods t′0 to t ′ i essentially coincide with the periods in Examples 1 to 4 for the embodiment according to FIGS. 1 to 3, so that an exact determination of the hardness of coins is also possible with the second embodiment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
EP92118793A 1991-11-19 1992-11-03 Münzprüfeinrichtung zur Härtebestimmung von Münzen Expired - Lifetime EP0543212B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4138018 1991-11-19
DE4138018A DE4138018C1 (no) 1991-11-19 1991-11-19

Publications (2)

Publication Number Publication Date
EP0543212A1 EP0543212A1 (de) 1993-05-26
EP0543212B1 true EP0543212B1 (de) 1995-09-27

Family

ID=6445125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118793A Expired - Lifetime EP0543212B1 (de) 1991-11-19 1992-11-03 Münzprüfeinrichtung zur Härtebestimmung von Münzen

Country Status (3)

Country Link
EP (1) EP0543212B1 (no)
DE (2) DE4138018C1 (no)
ES (1) ES2078628T3 (no)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288266B (en) * 1994-03-29 1997-07-02 Mars Inc Coin validation
DE19503765C1 (de) * 1995-02-04 1996-05-02 Nat Rejectors Gmbh Münzgerät mit einer Vorrichtung zur Härtebestimmung von Münzen
ES2114831B1 (es) * 1996-11-05 1999-04-16 Inversiones Taconera S L Sistema discriminador de monedas.
GB2339316A (en) 1998-07-09 2000-01-19 Mars Inc Coin validators
ES2160066B2 (es) 1999-08-18 2002-07-16 Jofemar Sa Selector de monedas mejorado.
EP1383086A1 (en) 2002-07-19 2004-01-21 Mars, Incorporated Coin validation by signal processing

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879982A (en) * 1972-10-16 1975-04-29 Ernst Schmidt Method and apparatus for testing hardness of specimens
DK327581A (da) * 1981-07-23 1983-01-24 Gnt Automatic As Fremgangsmaade til klasseficering af moenter i henhold til deres mekaniske elasticitet
DE3237457A1 (de) * 1982-10-07 1984-04-12 Bally Wulff Automaten GmbH, 1000 Berlin Muenzpruef- und -bewertungseinrichtung
GB2173624B (en) * 1985-04-08 1988-12-14 Qonaar Corp Low power coin discrimination apparatus
EP0356582A1 (en) * 1988-08-05 1990-03-07 THE GENERAL ELECTRIC COMPANY, p.l.c. Object identification
GB8727526D0 (en) * 1987-11-24 1987-12-23 Plessey Co Plc Coin determination
CH670167A5 (no) * 1987-12-31 1989-05-12 Automaten Ag
GB2236609B (en) * 1989-10-04 1993-10-20 Mars Inc Method and apparatus for coin validation
DE9202944U1 (no) * 1992-03-06 1992-06-11 National Rejectors Inc. Gmbh, 2150 Buxtehude, De

Also Published As

Publication number Publication date
EP0543212A1 (de) 1993-05-26
ES2078628T3 (es) 1995-12-16
DE4138018C1 (no) 1992-11-05
DE59203835D1 (de) 1995-11-02

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