EP0725374A2 - ContrÔleur de pièces de monnaie avec dispositif pour vérifier la dureté - Google Patents

ContrÔleur de pièces de monnaie avec dispositif pour vérifier la dureté Download PDF

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Publication number
EP0725374A2
EP0725374A2 EP95117912A EP95117912A EP0725374A2 EP 0725374 A2 EP0725374 A2 EP 0725374A2 EP 95117912 A EP95117912 A EP 95117912A EP 95117912 A EP95117912 A EP 95117912A EP 0725374 A2 EP0725374 A2 EP 0725374A2
Authority
EP
European Patent Office
Prior art keywords
coin
sensor
operated device
coin operated
evaluation electronics
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.)
Granted
Application number
EP95117912A
Other languages
German (de)
English (en)
Other versions
EP0725374B1 (fr
EP0725374A3 (fr
Inventor
Hans-Ulrich Dipl.-Ing. Cohrs
Wilfried Dipl.-Ing. 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
Application filed by National Rejectors Inc GmbH filed Critical National Rejectors Inc GmbH
Publication of EP0725374A2 publication Critical patent/EP0725374A2/fr
Publication of EP0725374A3 publication Critical patent/EP0725374A3/fr
Application granted granted Critical
Publication of EP0725374B1 publication Critical patent/EP0725374B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G07D5/06—Testing the hardness or elasticity

Definitions

  • the invention relates to a coin device with a device for determining the hardness of coins according to the preamble of patent claim 1.
  • a coin testing device for hardness determination of coins in which a sensor has a relatively hard stop surface in relation to the coin material.
  • the time period is determined with the aid of evaluation electronics and compared with a predetermined value, that between the output signal of the sensor when the coin is struck and a rimpedement of the output signal is at the original value.
  • the duration of contact of the coin with the stop surface of the sensor is used as a criterion for the hardness determination.
  • the period of time that results from the time the coin strikes the sensor and the time the coin jumps off is a reliable measure of the hardness of the coin. This period essentially depends on whether elastic or very soft materials are used for the coins, such as lead.
  • the hardness of the abutment surface must be sufficiently large, at least greater than that of the material of real coins, so that the coin vibration generated and detected by the sensor depends largely on the coin hardness and to a lesser extent on other factors, such as the coin weight, the speed and the sensor geometry .
  • either a piezo crystal or a contact pin is used as the sensor.
  • the contact pin interacts with a high-frequency foil, which is arranged in the area of the coin track, so that an RF voltage generated by a high-frequency generator can be capacitively coupled to the coin via the foil.
  • the invention has for its object to improve a coin device with a device for determining hardness of the type mentioned so that falsified coins of soft material can be distinguished more clearly from real coins.
  • the senor is arranged resiliently so that further impacts follow when a coin first hits the stop surface.
  • the sensor bounces off the coin when it is first touched and strikes the coin at least once, preferably several times, after a time determined by the sensor mass and the spring constant. With each touch, energy is converted in the sensor and in the coin.
  • the improvement of the invention now consists in the fact that not only a single measured value is generated, but several, from which the actual measurement result can then be calculated, for example by averaging.
  • the evaluation electronics can, for example, determine the amplitudes of the vibration generated by the individual impacts and compare them with predetermined values within a predetermined time interval. For example, if three amplitude values are above a predetermined level, this can speak for the authenticity of a coin.
  • the duration of an output signal of the sensor can be measured, which elapses between the impact of a coin on the sensor and the approximation of the output signal to the original value. If this time period lies within a predetermined range in the case of several successive operations, this can apply to a real coin.
  • it can also be determined how many signals are above a certain amplitude within a predetermined time interval, corresponding to the number of times the coin is struck on the sensor. Hard materials generally have a lower energy conversion than soft materials, so that a large number of oscillation periods can be achieved within one time interval.
  • the spring is formed by a leaf spring, at the end of which the sensor can be arranged.
  • the spring can also serve as a conductor for connecting the sensor to the evaluation electronics.
  • the stop surface is point or line-shaped.
  • the stop surface is formed by a steel ball.
  • the sensor can be arranged on a mass block, which naturally determines the vibration behavior of the spring. It is also conceivable to omit the mass block and to leave the piezo sensor as the only mass.
  • a coin 1 is shown rolling 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 supported on a counter block 6, preferably made of steel.
  • the steel block 6 is attached to the end of a leaf spring 10 which is fixed to the device at 12. If the coin 1 hits the steel ball 4, a voltage curve according to FIG. 3 arises at the piezoelectric element 5, which is fed to an evaluation electronics 9 via a circuit arrangement 7 according to FIG. 2 and an operational amplifier 8.
  • Fig. 3 it can be seen that within a predetermined time interval t n three recurring, decreasing in amplitude vibrations occur. Each vibration represents the striking of the steel ball 4 on the coin 1. When struck for the first time, the impact causes the sensor arrangement to rebound. Since this is suspended from the spring 10, the steel ball 4 can lift off the coin running surface. After a certain time, the Steel ball 4 of the coin again, this process being repeated. It depends on the hardness of the coin 1 and the hardness of the steel ball 4 as well as the spring behavior of the spring arrangement made of leaf spring 10 and the mass of the sensor, steel ball and steel block.
  • the period of the vibrations t 1 -t 0 , t 1 ' -t 0' or t 1 '' -t 0 '' is approximately the same, while the amplitude gradually decreases due to the inevitable vibration losses.
  • the amplitudes of all vibrations in the positive range are greater than level A.
  • Level A can be seen as a criterion for the authenticity of a coin. If the amplitudes are above level A in a predetermined time interval, authenticity is present. If they are below this, there is a false certificate.
  • a much softer material, such as lead or the like which can otherwise be geometrically and approximated by the weight of a real coin, exhibits a completely different impact behavior.
  • the number of vibrations per time interval t n can also be calculated. It is also possible to determine the number of vibrations per unit of time, which corresponds to the number of shocks per time interval. Although the amplitudes are smaller, they also last longer.
  • the time integral may like that of a real coin.
  • a plurality of measured values can be obtained in any case, which can also be averaged, for example, in order to reduce the effects of scatter values.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
EP95117912A 1995-02-04 1995-11-14 Contrôleur de pièces de monnaie avec dispositif pour vérifier la dureté Expired - Lifetime EP0725374B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19503765A DE19503765C1 (de) 1995-02-04 1995-02-04 Münzgerät mit einer Vorrichtung zur Härtebestimmung von Münzen
DE19503765 1995-02-04

Publications (3)

Publication Number Publication Date
EP0725374A2 true EP0725374A2 (fr) 1996-08-07
EP0725374A3 EP0725374A3 (fr) 1998-05-20
EP0725374B1 EP0725374B1 (fr) 2002-11-27

Family

ID=7753237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117912A Expired - Lifetime EP0725374B1 (fr) 1995-02-04 1995-11-14 Contrôleur de pièces de monnaie avec dispositif pour vérifier la dureté

Country Status (3)

Country Link
EP (1) EP0725374B1 (fr)
DE (2) DE19503765C1 (fr)
ES (1) ES2184781T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6138813A (en) * 1999-06-03 2000-10-31 Mars, Incorporated Coin mechanism with a piezoelectric film sensor
US7025190B2 (en) 2002-07-19 2006-04-11 Mars, Incorporated Coin validation by signal processing

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1378867A1 (fr) * 2002-07-02 2004-01-07 Azkoyen Medios de Pago, S.A. Procédé et dispositif pour vérifier des pièces de monnaie
EP1378866A3 (fr) * 2002-07-02 2004-04-21 Azkoyen Medios de Pago, S.A. Dispositif et procédé pour contrôler des pièces de monnaie
ES2420204B1 (es) * 2002-10-07 2015-03-17 Azkoyen, S.A. Dispositivo de verificación de monedas y selector de monedas
ES2344874B1 (es) * 2007-11-07 2011-06-28 Azkoyen Medios De Pago, S.A. Dispositivo y metodo de verificacion de monedas.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138018C1 (fr) 1991-11-19 1992-11-05 National Rejectors Inc. Gmbh, 2150 Buxtehude, De

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1001230A (fr) * 1946-03-29 1952-02-21 Perfectionnements apportés aux appareils de mesure à rebondissement, notamment à ceux pour la détermination de la dureté d'une pièce
US3425263A (en) * 1967-03-06 1969-02-04 Gen Electric Apparatus for measuring some mechanical properties of a material
DK327581A (da) * 1981-07-23 1983-01-24 Gnt Automatic As Fremgangsmaade til klasseficering af moenter i henhold til deres mekaniske elasticitet

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138018C1 (fr) 1991-11-19 1992-11-05 National Rejectors Inc. Gmbh, 2150 Buxtehude, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6138813A (en) * 1999-06-03 2000-10-31 Mars, Incorporated Coin mechanism with a piezoelectric film sensor
US7025190B2 (en) 2002-07-19 2006-04-11 Mars, Incorporated Coin validation by signal processing

Also Published As

Publication number Publication date
EP0725374B1 (fr) 2002-11-27
DE19503765C1 (de) 1996-05-02
DE59510476D1 (de) 2003-01-09
EP0725374A3 (fr) 1998-05-20
ES2184781T3 (es) 2003-04-16

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