WO1991016690A1 - Dispositifs de validation de pieces de monnaie - Google Patents

Dispositifs de validation de pieces de monnaie Download PDF

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Publication number
WO1991016690A1
WO1991016690A1 PCT/GB1991/000640 GB9100640W WO9116690A1 WO 1991016690 A1 WO1991016690 A1 WO 1991016690A1 GB 9100640 W GB9100640 W GB 9100640W WO 9116690 A1 WO9116690 A1 WO 9116690A1
Authority
WO
WIPO (PCT)
Prior art keywords
coin
sensor
guide
coins
predetermined
Prior art date
Application number
PCT/GB1991/000640
Other languages
English (en)
Inventor
James Churchman
Original Assignee
Tetrel Limited
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 Tetrel Limited filed Critical Tetrel Limited
Priority to EP91908671A priority Critical patent/EP0525084B1/fr
Priority to DE69120675T priority patent/DE69120675D1/de
Publication of WO1991016690A1 publication Critical patent/WO1991016690A1/fr

Links

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
    • G07D5/02—Testing the dimensions, e.g. thickness, diameter; Testing the deformation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F1/00—Coin inlet arrangements; Coins specially adapted to operate coin-freed mechanisms
    • G07F1/04—Coin chutes
    • G07F1/041—Coin chutes with means, other than for testing currency, for dealing with inserted foreign matter, e.g. "stuffing", "stringing" or "salting"
    • G07F1/042—Coin chutes with means, other than for testing currency, for dealing with inserted foreign matter, e.g. "stuffing", "stringing" or "salting" the foreign matter being a long flexible member attached to a coin
    • G07F1/044—Automatic detection of the flexible member

Definitions

  • This invention relates to coin validators.
  • coin validator Many different forms of coin validator are known in the prior art, including those which operate electrically and those which operate mechanically. Mechanical coin validators tend to be expensive and unreliable. Electrical validators, whilst having a relatively high degree of reliability in at least some respects, tend to be expensive.
  • the object of the invention in one aspect is to provide a relatively simple coin validator which is inexpensive but is nevertheless sufficiently reliable for a variety of uses .
  • the invention provides a coin validator comprising a guide defining a path along which a coin to be validated may move and a sensor for sensing coins moving along said path, the guide being constructed so that coins of different size will pass the sensor at different distances therefrom and the sensor being operable to sense the distance of the coin therefrom.
  • the invention provides a coin validator comprising a guide for guiding a coin along a predetermined path and a sensor for sensing coins moving along said path, said sensor comprising first and second conductive members positioned adjacent said path so as to be capacitively linked by a coin passing therealong and circuit means for producing a signal dependent upon said capacitive linking of said conductive members.
  • the invention provides, in its preferred form, a coin validator which is operable to validate or reject a coin dependent upon the time period for which the coin is sensed.
  • the aforesaid time period is set to be within relatively fine limits since it will be difficult for the person inserting the coin on a string to ensure that it is inside the validator and adjacent the sensor for an appropriate time.
  • Figure 2 is a vertical, longitudinal section along the line 2-2 of Figure 1;
  • Figure 4 is an electrical block diagram of circuitry included in the validator of Figures 1 to 3;
  • Figure 5 is a circuit diagram corresponding to Figure 4;
  • Figures 6A and 6B indicate signals produced in the circuitry of Figures 4 and 5;
  • Figure 6C indicates time periods defined by a micro-processor included in the preferred embodiment
  • Figure 8 is an electrical block diagram of circuitry included in the validator of Figure 7 ;
  • Figure 9 is a circuit diagram corresponding to Figure 8.
  • a coin validator 10 comprises a faceplate 11, a channel 12 attached at one end to the faceplate 11 and mounted to extend obliquely downwardly as shown in Figure 2 and a sensor 9 ( Figures 2 and 3) in the form of a printed circuit board mounted on the channel 12.
  • the faceplate 11 is provided with a slot 14 which is in register with the channel 12 and extends transversely thereto.
  • the channel 12 comprises a base 17 and divergent sidewalls 18 and the slot 14 is positioned so that a coin may be inserted therethrough into the channel 12 at a position remote from the base 17 i.e. near to the top of the divergent sidewalls 18.
  • the slot 14 has a width and height such as to permit, with a small clearance, insertion of coins, such as coin 20, of the denomination to be validated whilst blocking insertion of coins of larger diameter or thickness and the spacing and divergence of the sidewalls 18 of channel 12 is chosen so that coins of this denomination, such as coin 20, will slide down the channel 12 and pass the sensor 9 at a relatively close spacing thereto indicated by dimension X. Whilst coins which are thinner than the coin 20 of predetermined denomination and/or are of smaller diameter than the coin 20, can be inserted into the channel 12 through the slot 14, such coins, such as 20a, will travel down the channel 12 at a much greater distance, such as distance X2, from the sensor 9 than the valid coin 20.
  • the sensor 9 is operable to produce a signal which is dependent upon the distance between the coin and the sensor as the coin travels down the guide and to produce a signal indicating that the coin is valid only when the coin passes sufficiently close to the sensor.
  • oversized coins will be prevented from being inserted into the validator by the size of the slot 14 and undersized coins will pass the sensor 9 with a distance which is too great to validate the coin.
  • the sensor 9 comprises first and second rectangular conductive plates 13,15 formed on the undersurface of the printed circuit board so as to face coins travelling down the guide 12.
  • the plates 13,15 are coextensive in the direction of movement of the coin but spaced apart from each other to leave a gap within which the stem 16a of a T-shaped conductive member 16, also formed on the underside of the printed circuit board, is located.
  • the cross piece 16b of the T-shaped conductive member is positioned between the plates 13,15 and the faceplate 11.
  • a high frequency oscillator for example producing a signal of 3.58 MHz, has its output connected between the plate 15 and the conductive member 16, which is grounded.
  • Sensor circuitry 31 has its input connected between the plate 13 and ground and its output connected to the input of comparator circuitry 32 whose output is, in turn, connected to a microprocessor 33. Since the conductive member 16 is grounded, its stem 16a electrically isolates the plates 13 and 15 from each other and its cross piece 16b electrically isolates the plates 13,15 from electrical influences present at or in the region of the slot 14.
  • the oscillator 30 is connected to the sensor circuit 31 via the capacitance between the plate 15 and the adjacent portion of the coin 20 and the capacitance between the plate 13 and the adjacent portion of the coin 20.
  • This capacitance gradually increases as the coin moves more and more into registration with the plates 13,15 i.e. as the area of overlap between the plates and the coin increases, and the maximum value that the capacitance reaches when the coin is completely in register with the plates 13 and 15 depends upon the size of the coins and its closeness to the plates 13 and 15. After the coin passes this point as it moves along the guide, the capacitance decreases.
  • the oscillator 30 is shown as comprising 10 a crystal 50, transistor 52, resistors 54 and 56 and capacitors 58 and 60.
  • Capacitors Cl and C2 represent the capacitance between the coin 20 and the plates 15 and 13 respectively and capacitor C3 represents the capacitance between member 16 and the coin.
  • 15 sensor comprises diodes 60 and 62, a capacitor 64 and a resistor 66.
  • the arrangement of capacitors Cl, C2, C3 and 64 and diodes 60 and 62 is such as to form a voltage doubling circuit.
  • the comparator 32 comprises a voltage divider made up of resistors 68 and 70 connected to one input of a
  • the amplifier 72 provides an output signal only during periods when the voltage on capacitor 64 is above a threshold defined by the voltage divider 68,70.
  • threshold is selected so that the voltage across capacitor 64 only exceeds the threshold where the coin which passes the sensor 9 is conductive and is of a coin of the selected denomination to be validated.
  • Curve A in Figure 6A is a diagrammatic plot of the voltage appearing across capacitor 64 as a valid coin passes down the guide 12. Initially, as the coin begins to overlap the conductive members 13,15, the voltage across capacitor 64 increases at a
  • the voltage across capacitor 64 continues to increase but at a slower rate until it reaches a maximum value VI. At this point, the coin has ceased to overlap the plates 13,15 and no more current is thereafter supplied to the capacitor 64. Accordingly, the voltage across the capacitor 64 then decays exponentially.
  • Figure 6A indicates a threshold voltage Vt set by voltage divider 68,70. As curve A passes through this threshold, the output from comparator 72 drops from a high to a low level as indicated in Figure 6B. As curve A passes back through the threshold Vt during the exponential decay of the voltage on capacitor 64, comparator 72 detects this and its output returns to a high level. Thus, comparator 72 outputs a negative going square pulse whose length is equal to the period of time for which curve A is above the threshold Vt.
  • Curve B in Figure 6A illustrates the voltage on capacitor 64 produced as a coin or other conductive element passes down the guide 12 at a distance from the plates 15,13 which is too great for the capacitor 64 to be charged up to the threshold level. As a result, the output of the comparator 72 does not change.
  • the micro-processor 33 is programmed to define two time periods T in and Tmax which are represented in
  • Fig. 6C and only to validate the coin if the length of the negative going pulse output by the comparator is between Tmin and Tmax.
  • Figs. 6A, 6B and 6C show that the time period tl is less than Tmin and therefore the coin is not validated whereas time period t2 is between Tmin and Tmax and therefore the coin is validated. If the comparator 32 produces a negative going output pulse having a length greater than Tmax, micro-processor 33 will not validate the coin.
  • Figures 7 to 9 differ from Figures 1 to 6 in that the sensor 9 is replaced by a sensor 9a which is operative to produce two pulses in succession, similar to those illustrated in Figures 6A to 6C and the microprocessor is programmed to validate the coin only if the two pulses produced are firstly in the correct order indicating that the coin is travelling down the chute and of the correct duration, indicating that the coin is of the correct size, whereby any attempt to use the same coin twice by dropping it into the chute 12 on a string and then withdrawing it to cause it to be validated again can be readily defeated.
  • the electrodes 13, 15 and 16 of Figure 1 are omitted and instead three rectangular plate electrodes 13a, 150 and 13b are arranged at spaced apart positions in succession along the chute 12 and strip electrodes 16a and 16b extending transverse to the chute 12 are positioned between the electrode 150 and electrodes 13a and 13b respectively but spaced apart therefrom.
  • the electrodes 16a and 16b are grounded and the oscillator 30 has its output connected between ground and the electrode 150 so that as a coin 20 passes down the chute 12 it will, as shown in Figure 8, first form interconnected capacitors with the electrodes 13a and 150 so as to couple the oscillator 30 to the sensor circuitry 31a and thereafter will form capacitors with the electrodes 150 and 13b to couple the output of the oscillator 30 to the sensor circuitry 31b.
  • the capacitors formed with the electrodes 13a and 150 are designated in Figure 9 as C2a and Cl, with the reference character C3a indicating the capacitance formed between the coin and the grounded electrode 16a.
  • Figure 9 also shows, partly in broken lines, the capacitances C3b and C2b formed between the electrodes
  • Sensor circuitry 31a and 31b are the same as each other and the same as circuitry 31 illustrated in Figure 5.
  • the outputs are supplied respectively to comparator circuitry 32a and 32b which are also the same as the comparator circuitry 32 shown in Figure 5.
  • the circuitry 31a and 32a and 31b and 32b will each produce waveforms as shown in Figure 6 and these are supplied to the micro processor for determination of the direction of travel of the coin and validation thereof as already indicated.
  • the capacitive sensing arrangement described with reference to the drawings is highly advantageous and economical, other means for sensing the distance of the coin from the sensor i.e. sensing the position of the coin in the guide, could be employed.
  • the capacitive sensor 9 could be employed with forms of guide for the coin other than that illustrated in the drawings. For example, sensing of the diameter of a coin could be performed with this capacitive sensor even where a guide is used which does not cause coins of differing size to move at different distances past the sensor.
  • the guide could be constructed so that coins smaller than the size of coin to be validated pass the sensor at a different angle rather than simply at a different distance or possibly even fall out of the guide altogether before going past the sensor.
  • the guide is thus arranged in the preferred embodiment so that coins of the correct size will pass the sensor with a predetermined disposition and the sensor senses this disposition.
  • a number of coin validators in accordance with the invention can be mounted in a common housing.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)

Abstract

Un dispositif de validation (10) comprend une fente (14) qui accepte des pièces de monnaie (20, 20A) d'un diamètre et d'une épaisseur spécifiques avec une faible tolérance, un guide (12) qui reçoit les pièces issues de la fente et un capteur (9) qui analyse les pièces qui se déplacent le long du guide. Le guide est muni de parois divergentes (18), de sorte qu'une pièce à valider passera près du capteur, tandis que les pièces plus petites passeront à une plus grande distance du capteur. La validation est réalisée en disposant le capteur de manière à détecter la distance (X) à laquelle la pièce passe. De préférence, le capteur comprend des plaques capacitatives (13, 15) qui, avec la pièce qui passe, font office de condensateur, la capacitance variant en fonction de la distance de passage de la pièce.
PCT/GB1991/000640 1990-04-20 1991-04-22 Dispositifs de validation de pieces de monnaie WO1991016690A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP91908671A EP0525084B1 (fr) 1990-04-20 1991-04-22 Dispositifs de validation de pieces de monnaie
DE69120675T DE69120675D1 (de) 1990-04-20 1991-04-22 Münzenprüfer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9008882A GB2243238B (en) 1990-04-20 1990-04-20 Coin validators
GB9008882.4 1990-04-20

Publications (1)

Publication Number Publication Date
WO1991016690A1 true WO1991016690A1 (fr) 1991-10-31

Family

ID=10674712

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000640 WO1991016690A1 (fr) 1990-04-20 1991-04-22 Dispositifs de validation de pieces de monnaie

Country Status (8)

Country Link
EP (1) EP0525084B1 (fr)
AU (1) AU7756291A (fr)
DE (1) DE69120675D1 (fr)
ES (1) ES2069510T3 (fr)
GB (1) GB2243238B (fr)
HK (1) HK176396A (fr)
IE (1) IE66036B1 (fr)
WO (1) WO1991016690A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544035A1 (fr) * 1988-04-14 1993-06-02 Shell Internationale Researchmaatschappij B.V. Composition de nettoyage
ES2046128A1 (es) * 1992-06-12 1994-01-16 Azkoyen Ind Sa Selector de monedas.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2974934B2 (ja) * 1995-06-02 1999-11-10 ザ、プロクター、エンド、ギャンブル、カンパニー 生理用ナプキン
SE521207C2 (sv) 2001-03-22 2003-10-14 Scan Coin Ind Ab Anordning och metod för särskiljning av mynt där en variation i kapacitans sker mellan en sensorelektrod och en yta hos myntet då myntet är under transport
SE522752C2 (sv) 2001-11-05 2004-03-02 Scan Coin Ind Ab Metod att driva en myntdiskriminator och en myntdiskriminator där påverkan på spolorgan mäts när mynt utsätts för magnetfält alstrade av spolorgan utanför myntet
EP1668602B1 (fr) 2003-09-24 2010-04-21 Scan Coin Ab Discriminateur de pieces de monnaie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184366A (en) * 1976-06-08 1980-01-22 Butler Frederick R Coin testing apparatus
GB2062327A (en) * 1979-10-18 1981-05-20 Gnt Automatic As A Capacitive Coin Detector
EP0078214A1 (fr) * 1981-10-27 1983-05-04 Joel Doucet Sélecteur multipièce de monnaie
EP0109057A2 (fr) * 1982-11-16 1984-05-23 Groupement d'Intérêt Economique régi par l'ordonnance du 23 septembre 1967 dit: GESI Sélecteur de pièces de monnaie
GB2174227A (en) * 1985-04-15 1986-10-29 Coin Controls Apparatus for discriminating between different metallic articles

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB994736A (fr) * 1962-11-27 1965-06-10 Tateisi Denki Kabushikikaisha
GB1464371A (en) * 1973-01-29 1977-02-09 Verril R Coin operated apparatus
GB2045498B (en) * 1979-03-30 1983-03-30 Mars Inc Coin testing apparatus
JPS5616276U (fr) * 1979-07-17 1981-02-12
GB2096812B (en) * 1981-02-18 1985-06-05 Appliance Components Ltd Validation of coins and tokens
FR2541019B1 (fr) * 1983-02-10 1986-07-18 Mecelec Sa Procede optique pour determiner les dimensions d'un objet en mouvement relatif, et plus particulierement d'une piece de monnaie dans un appareil a pre-paiement, et dispositif pour sa mise en oeuvre
CA1206618A (fr) * 1983-02-25 1986-06-24 J. Randall Macdonald Appareil electronique d'identification de monnaies
GB8511163D0 (en) * 1985-05-02 1985-06-12 Howells G Coin handling apparatus
CH667546A5 (de) * 1985-07-26 1988-10-14 Autelca Ag Einrichtung zur muenzenpruefung.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184366A (en) * 1976-06-08 1980-01-22 Butler Frederick R Coin testing apparatus
GB2062327A (en) * 1979-10-18 1981-05-20 Gnt Automatic As A Capacitive Coin Detector
EP0078214A1 (fr) * 1981-10-27 1983-05-04 Joel Doucet Sélecteur multipièce de monnaie
EP0109057A2 (fr) * 1982-11-16 1984-05-23 Groupement d'Intérêt Economique régi par l'ordonnance du 23 septembre 1967 dit: GESI Sélecteur de pièces de monnaie
GB2174227A (en) * 1985-04-15 1986-10-29 Coin Controls Apparatus for discriminating between different metallic articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544035A1 (fr) * 1988-04-14 1993-06-02 Shell Internationale Researchmaatschappij B.V. Composition de nettoyage
ES2046128A1 (es) * 1992-06-12 1994-01-16 Azkoyen Ind Sa Selector de monedas.

Also Published As

Publication number Publication date
DE69120675D1 (de) 1996-08-08
GB2243238A (en) 1991-10-23
GB2243238B (en) 1994-06-01
IE66036B1 (en) 1995-12-13
EP0525084B1 (fr) 1996-07-03
IE911332A1 (en) 1991-10-23
EP0525084A1 (fr) 1993-02-03
ES2069510T1 (es) 1995-05-16
HK176396A (en) 1996-09-27
GB9008882D0 (en) 1990-06-20
ES2069510T3 (es) 1996-10-01
AU7756291A (en) 1991-11-11

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