EP0543212A1 - Dispositif de test pour déterminer la dureté de pièces de monnaie - Google Patents
Dispositif de test pour déterminer la dureté de pièces de monnaie Download PDFInfo
- Publication number
- EP0543212A1 EP0543212A1 EP92118793A EP92118793A EP0543212A1 EP 0543212 A1 EP0543212 A1 EP 0543212A1 EP 92118793 A EP92118793 A EP 92118793A EP 92118793 A EP92118793 A EP 92118793A EP 0543212 A1 EP0543212 A1 EP 0543212A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coin
- sensor
- checking device
- coin checking
- coins
- 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
Links
- 238000012360 testing method Methods 0.000 title abstract description 17
- 238000011156 evaluation Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000013459 approach Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 229910003336 CuNi Inorganic materials 0.000 description 5
- 229910000978 Pb alloy Inorganic materials 0.000 description 4
- 238000004049 embossing Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 239000007779 soft material Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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 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.
- 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 differentiated using 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 checking 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 such that the impulse 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 testing 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 counterfeit coins that are identical in weight to the originals in question cannot be reliably identified. If the thickness and 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 checking 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 relatively hard.
- 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 period of time 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, 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 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, e.g. 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.
- a sensor 3 protrudes into the coin track with its stop surface 4, which represents a steel ball.
- a piezoelectric element 5 is arranged beneath 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 projects with its stop surface 11 into the coin track.
- the contact pin is supported 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.
- evaluation electronics 9 ' determine the time 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 time periods t'0 to t ' i essentially coincide with the time 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.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Coins (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4138018A DE4138018C1 (fr) | 1991-11-19 | 1991-11-19 | |
DE4138018 | 1991-11-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0543212A1 true EP0543212A1 (fr) | 1993-05-26 |
EP0543212B1 EP0543212B1 (fr) | 1995-09-27 |
Family
ID=6445125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92118793A Expired - Lifetime EP0543212B1 (fr) | 1991-11-19 | 1992-11-03 | Dispositif de test pour déterminer la dureté de pièces de monnaie |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0543212B1 (fr) |
DE (2) | DE4138018C1 (fr) |
ES (1) | ES2078628T3 (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995026540A1 (fr) * | 1994-03-29 | 1995-10-05 | Mars Incorporated | Validation de pieces de monnaie |
WO1998020464A1 (fr) * | 1996-11-05 | 1998-05-14 | Inversiones Taconera, S.L. | Systeme de tri de pieces de monnaie |
EP0977158A2 (fr) | 1998-07-09 | 2000-02-02 | Mars Incorporated | Procédé et appareil de vérification de la validité de pièces de monnaie |
US6425471B1 (en) | 1999-08-18 | 2002-07-30 | Jofemar, S.A. | Coin selector |
US7025190B2 (en) | 2002-07-19 | 2006-04-11 | Mars, Incorporated | Coin validation by signal processing |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19503765C1 (de) * | 1995-02-04 | 1996-05-02 | Nat Rejectors Gmbh | Münzgerät mit einer Vorrichtung zur Härtebestimmung von Münzen |
Citations (4)
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 |
WO1983000400A1 (fr) * | 1981-07-23 | 1983-02-03 | Meyer, Peter | Procede de classification de pieces de monnaie par rapport a leur elasticite mecanique |
DE3237457A1 (de) * | 1982-10-07 | 1984-04-12 | Bally Wulff Automaten GmbH, 1000 Berlin | Muenzpruef- und -bewertungseinrichtung |
DE9202944U1 (de) * | 1992-03-06 | 1992-06-11 | National Rejectors Inc. Gmbh, 2150 Buxtehude | Sensorkombination zum Prüfen von Münzen in einem Münzprüfer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2173624B (en) * | 1985-04-08 | 1988-12-14 | Qonaar Corp | Low power coin discrimination apparatus |
EP0356582A1 (fr) * | 1988-08-05 | 1990-03-07 | THE GENERAL ELECTRIC COMPANY, p.l.c. | Identification d'objets |
GB8727526D0 (en) * | 1987-11-24 | 1987-12-23 | Plessey Co Plc | Coin determination |
CH670167A5 (fr) * | 1987-12-31 | 1989-05-12 | Automaten Ag | |
GB2236609B (en) * | 1989-10-04 | 1993-10-20 | Mars Inc | Method and apparatus for coin validation |
-
1991
- 1991-11-19 DE DE4138018A patent/DE4138018C1/de not_active Expired - Fee Related
-
1992
- 1992-11-03 DE DE59203835T patent/DE59203835D1/de not_active Expired - Lifetime
- 1992-11-03 EP EP92118793A patent/EP0543212B1/fr not_active Expired - Lifetime
- 1992-11-03 ES ES92118793T patent/ES2078628T3/es not_active Expired - Lifetime
Patent Citations (4)
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 |
WO1983000400A1 (fr) * | 1981-07-23 | 1983-02-03 | Meyer, Peter | Procede de classification de pieces de monnaie par rapport a leur elasticite mecanique |
DE3237457A1 (de) * | 1982-10-07 | 1984-04-12 | Bally Wulff Automaten GmbH, 1000 Berlin | Muenzpruef- und -bewertungseinrichtung |
DE9202944U1 (de) * | 1992-03-06 | 1992-06-11 | National Rejectors Inc. Gmbh, 2150 Buxtehude | Sensorkombination zum Prüfen von Münzen in einem Münzprüfer |
Non-Patent Citations (2)
Title |
---|
SOVIET PATENTS ABSTRACTS Section EI, Week 8748, Derwent Publications Ltd., London, GB; Class S, AN 87341181 & SU-A-1 307 295 (AS BELO APPLD PHYS) * |
SOVIET PATENTS ABSTRACTS Section EI, Week 9107, Derwent Publications Ltd., London, GB; Class S, AN 91050305 & SU-A-1 573 393 (CORRESP POLY) * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995026540A1 (fr) * | 1994-03-29 | 1995-10-05 | Mars Incorporated | Validation de pieces de monnaie |
GB2288266A (en) * | 1994-03-29 | 1995-10-11 | Mars Inc | Coin validation |
GB2288266B (en) * | 1994-03-29 | 1997-07-02 | Mars Inc | Coin validation |
US5797475A (en) * | 1994-03-29 | 1998-08-25 | Mars Incorporated | Coin validation |
WO1998020464A1 (fr) * | 1996-11-05 | 1998-05-14 | Inversiones Taconera, S.L. | Systeme de tri de pieces de monnaie |
ES2114831A2 (es) * | 1996-11-05 | 1998-06-01 | Inversiones Taconera S L | Sistema discriminador de monedas. |
US6059089A (en) * | 1996-11-05 | 2000-05-09 | Inversiones Taconera, S.L. | Coin discriminator system |
AU732168B2 (en) * | 1996-11-05 | 2001-04-12 | Inversiones Taconera, S.L. | Coin discriminating system |
EP0977158A2 (fr) | 1998-07-09 | 2000-02-02 | Mars Incorporated | Procédé et appareil de vérification de la validité de pièces de monnaie |
US6425471B1 (en) | 1999-08-18 | 2002-07-30 | Jofemar, S.A. | Coin selector |
US7025190B2 (en) | 2002-07-19 | 2006-04-11 | Mars, Incorporated | Coin validation by signal processing |
Also Published As
Publication number | Publication date |
---|---|
DE4138018C1 (fr) | 1992-11-05 |
EP0543212B1 (fr) | 1995-09-27 |
ES2078628T3 (es) | 1995-12-16 |
DE59203835D1 (de) | 1995-11-02 |
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