DE1902807A1 - Coin checker - Google Patents

Description

P Λ Ί ENTANWAL ι. ^;

Dr. Andrejewski Essen »January 17, 1969

Dr.-Ing. HonJj! (32 079 / Fm)

Essen, Kettwiger Str. 38 _1onoon "

(AmHauDtbahnhot Uchtburg) | ζ) U £. OU /

Telephone 225802/03

AÜTELCA AG. . Gümligen (Switzerland)

coin acceptor

The invention relates to a coin validator, in particular for vending and telephone cashier stations, wherein the coin passageway to an oscillator \ circuit through the field of at least one self-induction coil, the vibrations by the allow it to react; The effect of a body falling through the coin channel on the coil field can be changed temporarily, the assumption that the body as an acceptable coin or its non-acceptance depends on the change in the oscillator oscillations.

The change in the oscillator vibration that is decisive for the acceptance or non-acceptance of the body en can be, for example, a change in the frequency or the "J amplitude, in the latter case for example a temporary suspension of vibrations. A demodulator (discriminator or rectifier) can be used for this these vibrations emit an impulse when a metal body running through the coin channel has a certain one Changes in the vibrations caused temporarily.

^909837/0214 ORiGINALINSPECTED

One suggestion that was not part of the prior art was the coil of a coin validator of this type on an inclined part of the coin channel arranged so that the running through the coin channel Bodies ran parallel to the end face of the coil through its field. With this coin validator were reproducible Results achieved only when the body, especially the acceptable coins, in a certain Position in relation to the bobbin. This could only be done for a single coin diameter and a single coin thickness can be ensured that the cross-section of the coin channel has this diameter and adjusted to this thickness. Bent coins could lead to malfunctions by hanging in the coin channel remained or because of their curvature did not cause the desired change in the oscillations of the oscillator. The invention is based on the object of designing the coin validator in such a way that the result of the coin check is independent of the position in which the body falls through the coin channel. .

According to the invention, this is achieved in that the self-induction coil encloses the coin channel.

Since the field strength of the field of the coil is the same at all points of the space enclosed by it is the change in the oscillator oscillations within

909837 / 02U

ORIGINAL INSPECTED

half of the range of practically occurring layers body running through the coin channel of this coin validator regardless of its position. This also enables the cross-section of the coin channel the largest diameter and the greatest thickness of various acceptable coins without the test result becoming uncertain for the smaller coins.

The following is based on the enclosed

Drawing an embodiment of the inventive % coin validator described in more detail. The single figure shows schematically a coin validator for two types of coins, the electrical part of which is designed in such a way that the acceptance of a metal body as an acceptable coin or its non-acceptance depends on whether the oscillations of an oscillator stop temporarily.

The coin validator shown has a partially shown coin channel 1, the clear cross-section of which has the largest dimensions of the two types of coins. 'i is adapted with game. A coin with the larger dimensions is denoted by 2. Each of two self-induction coils 3 and 4 enclose the coin channel 1 and are arranged at a distance from one another which is so great that there is no coupling of the two coils which would interfere with the mode of operation described below. For this purpose, the distance can, for example, correspond to at least the dimension of a diagonal of the rectangular coils.

909837 / 02U " ⁴ "

-A-

The walls of the coin channel can be made of insulating material or metal. In the latter case the coin channel walls have a (not shown) Longitudinal slot that extends between the two coils and on both sides of the same so far that no disturbing Eddy current losses occur in the walls of the coin channel. This longitudinal slot can be filled with insulating material be filled out. If the walls of the coin channel are made of metal, a metal body falling through it cannot act capacitively on the coils. A capacitive effect would also be in the present arrangement from the position in which body falls through the coin channel, depends.

Each of the two coils is the resonant circuit coil of an oscillator of a circuit 5 or 6, the one Contains an oscillator and a rectifier acting as a demodulator, which supplies a pulse to a line 7 or 8, when the oscillator oscillations stop temporarily. The feedback from the oscillators of the two Circuits 5 and 6 are set so that a coin of the first acceptable type only vibrates the Oscillator of circuit 5, a coin of the other kind only the oscillations of the oscillator of circuit 6 temporarily stops, and a body not acceptable as a coin either causes the vibrations of both oscillators one after the other temporarily suspend or leave them unaffected.

- 6 909837 / 02U

Each of the lines 7 and 8 leads to the input of a mono-flop (monostable 'multivibrator) 9 and 10, respectively. The time constant of the mono-flop 9 is greater than the time during which a body falling through the coin channel 1 passes through both coils 3 and 4 in succession, and the time constant of the mono-flop 10 is at least around this Time longer than the time constant of mono-flop 9. The time constant of each of mono-flop 9 and 10 is less than the time interval between bodies thrown in one after the other. J The output of the mono-flop 9 is connected to a blocking input 11 an AND gate 12 connected. The other input 13 of the AND gate 12 is connected to the output of the circuit 6. At the output of the mono-flop 9, a differentiating circuit 14 is connected to which an inverter 15 follows, whose Output is connected to an input 16 of an AND gate 17. The other input 18 of this AND gate 17 is a blocking input fed by the monoflop 10.

Makes a decent coin of the first sort

a temporary suspension of the oscillator of the circuit % 5 and thereby a pulse on the line 7, but no pulse on the line 8. The mono-flop 9 then delivers an extended pulse, at the beginning and end of which the differentiating circuit 14 each delivers a brief pulse that have opposite polarity to each other. After inversion in the inverter 15, the first of these short-term pulses is on

- 6 909837/021 4

19028 Q 7

Entrance 16 of the gate. 17 has no effect because of its polarity, but the second, opposite, is effective. Because the mono-flop 10 was not actuated and the blocking input 18 of the gate 17 is therefore not activated, occurs at the exit of the gate 17 a coin acceptance pulse for the first type of coin.

An acceptable coin of the second type causes the oscillator to stop temporarily of circuit 6 and thereby a pulse on line 8 but no pulse on line 7. The pulse on the Line 8 actuates the mono-flop 10, creating a voltage occurs at the blocking input 18 of the gate 17, which has no further effect because there is no pulse on the line 7 no pulse occurs at the other input 16 of the AND gate 17. The pulse on line 8 also reaches the Entrance 13 of the AND gate 12, and there its other entrance 11, which is a blocking input, in the absence of a pulse the line 7 is not acted upon, a coin acceptance pulse for the second coin type occurs at the exit of the gate 12 on.

■ If an unacceptable metal body has a Pulse on the line 7 and then a pulse on the Line 8 generated, both mono-flops 9 and 10 are operated one after the other. By pressing the mono-flop 9, the lock input of the gate 12 applied, and since the Time constant of this mono-flop 9 longer than the time constant

9 09837/0214

Distance between the pulses on lines 7 and 8 is the gate 12 is still locked when at its entrance 13 of the Pulse from line 8 occurs. The gate 12 thus does not deliver a coin acceptance pulse. Because of the time constant; the mono-flop 9 and 10, the blocking input 18 of the gate 17 is already applied when at the end of the output pulse of the mono-flop 9 by differentiating and inversion formed pulse at the input 16 of the gate 17 occurs. Thus this gate 17 does not deliver a coin acceptance pulse either,

If an unacceptable body doesn't have any of the Causes oscillators to stop, neither occurs at the Line 7 nor a pulse on line 8, so that neither gate 12 nor gate 17 emits a coin acceptance pulse.

Because of the measurement of the time constants given above for both mono-flops 9 and 10, they comply each actuation back to their idle state before the next body falls through the coin channel.

909837 / 02U

Claims (4)

P a t e η t a η 's ρ r ü c h e 1. Coin validator, especially for self-sellers and telephone cashier stations, in which the coin channel runs through the field of at least one self-induction coil Oscillator circuit leads whose oscillations by the The effect of a body falling through the coin channel on the coil field can be changed temporarily, with the acceptance of the body as an acceptable coin or its Failure to accept the change in oscillator vibrations depends, characterized in that the self-induction coil surrounds the coin channel. 2. coin validator according to claim 1, characterized in that the walls of the coin channel at least in Areas of the self-induction coil consist of insulating material. 3. Coin validator according to claim 1, characterized in that that the walls of the coin channel are made of metal at least in the area of the self-induction coil and have a longitudinal slot in this area. 4. coin validator according to claim 3, characterized in that that the longitudinal slot is filled in the insulating material. K / eb - 3643
January 13, 1969 909837 / Q2U