DE2120869A1 - Coin validator - Google Patents

Description

Patent application 1ϋ. april Iy71

, .i λ Ii ζ ρ r ü fer.

The invention relates to electronic coin checkers, in which the position of a coin within a given limit value is ^{to be made visible ("window 11} ), in order to simplify the setting of the coin checker in this way.

rJünzprül'er have not yet become known, ! »He well-known coin validators use consistently for the determination of tension measurements typical of coins ! • 'enaterscijaltungen consisting of two or more with each other ioyiseu linked tension sensitivity indiichexi thresholds that provide digital information (e.g. thyristors , Schmitt trigger, etc.)

DOlcue i'ensterschaltungea only give the statement whether one coin is one that has fallen into the chosen acceptance range Jpannun ^ swert generated bat or not.üie deliver nicut the statement where within the selected acceptance area this voltage value lies. ! Can't do that it can be recognized whether the coin tester is optimally adjusted. For this purpose a "lenyen-jcatistik" would have to be created with a number of coins or it has to be done with worked on several specifically selected ürenz coins will.

who is jrlinuun ^; It is possible to provide a visor tester, which divides a coin in a selected judge and thus allows the "jiinbück" in that, the soldier tester is fast -

2098 46 / 006.6

and cL. with economical - to discontinue, because every iincation a voltage divider in front of the "window" "(e.g. by, ..- turning a trim spot) directly in their effect the analog position of the coin denomination within the monetary range is to be followed. If one of the; ^ rxabrungstat.3 & cL-c assumes that the optimal extent of a. Annaiimebereici / es ('Feristerbreite' ^ only needs to be set once, can be at an eriinduriß-sgemussea iuünzprüi'er the adjustment with only one only over-eaten iiittei coin happen.

According to the invention, the "windows" used are made up of two tension-sensitive thresholds formed, of which at least one - and the first appealing - amplifier properties Has.

In the simplest case, only a single transistor can do this its switching behavior in the range between saturation and blocking or vice versa is used, so the so-called "A" operation. \

The second, delimiting the window on the other side Basically, the threshold can be designed as desired.

In principle, you could use the reinforcing threshold for yourself used alone, if one would achieve that not only between two switching states (e.g. voltage above the Window limit and voltage below the window limit), but between the three of them (Tension above the window, tension in the window, tension below the window).

According to a proposal that does not belong to the state of the art, this could basically be done by superimposing an IiF of low amplitude on the actual (equalized) measurement voltage and having this amplified by the transistor. This embodiment is behaftet.Sie b.teilen tätsnac-but freguentabhängig in principle and with St.abi 1.1 should therefore be considered auss.er .gelassen "Because aes e-rxordoi'i-icheii geschaiteten Gleichrichtersi-it is also .teurer tixs the proper Scha ± tuuy. t-selt = certain frequencies they cannot be used for measuring moving coins.

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According to the invention, a transistor is used in the amplifying window wave which amplifies the rectified measurement signal supplied to it, on which no DI ^{1 is} superimposed, and whose amplification is set according to the required window width (e.g. by means of negative feedback) This transistor will not emit a signal if the measuring voltage culminates above its limit.

If, however, the excess voltage falls into the. ä — area of the transistor, then a typical coin collector voltage arises, which can be removed, stored or used for a pulse-like statement can.

The transistor does not behave differently, however, if the measurement voltage falls below a desired acceptance range. The transistor cannot distinguish between the latter two states because it can only monitor the upper limit * of a selected window, but not - according to a characteristic of the Invention ¹ - at the same time also the lower one. For this reason, the lower limit "of the window is monitored by θ a second threshold. In principle, this can also consist of just one transistor.

In the idea of the invention nothing changes if a comparator or an operation amplifier or the like is used instead of the single amplifying transistor also train in this way in exercises that are still stable.

ο (.ί · Eriinduiii; it is, ücss that according to the intensifier principle arbeixenue! ce, en i-'enstc, jcm ..... dunking at iuünzijrdi'erxi - far. · ■■ - »..Uii. bx-s uiilen. ^ chwexia formed siiio- a principal / ortei1 uui:

vvi ο vorsteiieno carried out, the "Jiollektor des veratärkenuoij transistor delivers a coin-typical voltage curve, soft directly nroportionei thorn link immersion of a measuring voltage weight j ii ocHj j. '(;n;; - tc" i iiwi'ei ch is and oamit a. "Jirokte, ■ iusi = a-: e, lie- - * <." oj i. ül.f.'i- oie i-ioiij. · <j <) (M "woni ..;. er oji iriioie i. ^ te.veinstiinmuni * of

209846/0066

Coin-typical measuring signal and window,

This is done in that the circuit according to the invention the part of the total attenuation curve which is above the selected Window is suppressed (because the amplifying transistor is saturated or blocked) and only the the topmost tip of the damping curve, which is essential for the measurement statement - but this is reinforced! - represents.

This amplified signal typical of coins can be seen after another The idea of the invention can be represented very easily - if necessary after inserting an isolating transistor - by adding a measuring capacitor, for example charges analog with the amplified signal.

(In the event that the window area is left, the The second sulfur used according to the invention is the reinforcing one Disconnect the transistor directly or indirectly and discharge the measuring capacitor.)

The window circuit according to the invention has compared to known Circuits yet another advantage:

In order to acquire precise and closely spaced measured values, these must be carried out absolutely and in a highly stable manner with both window limits. The inventive window circuit provides this accuracy requirement only at the top - reinforcing window border and not at the untere.Dieser enhanced measurement voltage is in fact already supplied, and therefore can their äfBKxixxkHHgXHBiGenauigkeit by the amount of reinforcing poor W be ter when für'beide systems want to achieve the same measurement accuracy. For this reason, one will only use the upper threshold as a comparator or operational amplifier. (It should be pointed out here, however, that nothing changes in the idea of the invention if an unamplified signal is also supplied to the second window baffle!)

For the idea of the invention it is ultimately irrelevant how the window width of the window according to the invention is set. This can be done by changing the voltage distribution accordingly happen (e.g. 13th trim spots) or after another Thoughts of the invention in a particularly advantageous manner different setting of the gain of the reinforcing Threshold.

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This is of particular advantage when there are several measuring ranges be monitored, i.e. by multi-variety testers. Namely, one can now set the limit level in a known manner keep constant and uniform for all windows and thus achieve for downstream analog display and / or Evaluation devices despite possibly different window widths a standardized output stroke, the output signal and thus - e.g. with pointer instruments - for all measuring ranges (coin types) uniform acceptance areas (= limit fluctuations).

The idea of the invention is shown in the following figures explained with a few examples:

Show it

Fig.l attenuation curves of two "wrong" and one "correct" coins below the idle amplitude and the selected acceptance range for the "correct" coin.

Fig.2 an enlargement of the Annabmebereiehes from Fig. 1, as well as other typical curves of "correct" coins, which result from specimen scatter.

Fig. 3 shows the basic circuit diagram of a window according to the invention with the corresponding signal patterns of the upper (reinforcing) and lower window limiting circuit.

In Fig. 1, the idle amplitude is denoted by 1, the base by 2. The acceptance area 3 for a certain coin is denoted by 3, the two window limits with 31 and 4o is the damping curve of an underdamping and thus false coin, 6o the coin that is too dampening. A "correct" coin typical attenuation curve is denoted by öo,

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Fig.2 shows the window section from Fig.l with the same Descriptions enlarged. More in the acceptance area falling attenuation curves are denoted by 51, 52, 53, 54 and 55.

ASIe these "correct" measured values are also known from those that have become known Window switching shown as correct

the exact position of each individual damping curve in alb

des Annabmebereic hes only says (ade inventive method something out of. The figure "shows an ideal match of damping curves and windows: the "outliers" oil and 55 are about the same distance from the window boundaries. An occurring drift due to temperature or long-term has the same safety distance on both sides. A conventional window would not recognize that P e.g. curve 51 only just barely dips into the window already knew that at a very low temperature drift the loo% acceptance of all correct coins is no longer guaranteed. To avoid this uncertainty, cumbersome quantity statistics would have to be made including temperature tests.

In Fig. 3, 1 denotes the operating voltage, 2 the ground (minus) and deH3 the input for the - possibly pre-amplified - measuring probe signal. 5 represents the amplifying transistor of the upper window limit circuit, 4 the input resistance of the circuit and 6 the collector resistance. The ratio of the resistor 6 to the resistor 4 determines the gain ". With the measured T _r immpot 7, the tension-related position of the upper""· reinforcing - Fensterbegrenzungsscbaltung for the input signal eingestellt.Kollektorausgang ό now provides depending on the size of the inputted measurement signals different statements:

The operating voltage is shown with loo, which at the same time forms the upper window limit (blocking state of transistor 5). The lower window limit is shown with 2oö, J ₀ welcöe is set by means of trimming pot 11, if necessary by a fixed voltage divider.

■ -. -

«* Detail lol shows that transistor 5 is in its off state

O) remains. When ^M riohtiger ^ll coin the input signal on line Q 3 is so low that the transistor wirdfürid controlled in its work area 5 °, although in the analog relative to the size of the 0> Eingangsslgnala. (Detail Io2). ·

If the measuring voltage drops as a result of a wrong coin

f * fc 3 X * If θ Ύ *
SBlBX attenuation- below the specified acceptance range, then

w; the base-transmitter path of the transistor 9 becomes conductive and the collector voltage of transistor b cannot drop any lower, than specified by potentiometer 11. (In this iieispiei it is assumed that v / resistance 11 vernachiässij is negligibly small compared to the resistance 6 not taken into account by transistor 9.) As a result, the curve Io3 appears in principle.

If the base ^ mitfer path of the transistor 9 is conductive, so is a corresponding collector current, which is applied to the resistor Io causes a voltage drop according to curve ± §1. If the relaxation voltage does not drop to the lower window limit then there is no signal on line 12. (jjild 2ol and 2o2).

The signal according to curve 2o3 can now either in a known manner by means of forward linking or by means of backward linking can be used to control the switching behavior of the first reinforcing window limiting circuit to undo or annul. The link is not shown in the circuit diagram. in the In the case of a reverse link, a line 3 would be connected to a Curve according to lo <±.

jjns analog and amplified i..eiäsi: jnal kan _.; about jr.uitung o2 for a qualitative / iUssage π. be rii'xen.

. ei the presence of several measuring ranges (= window circuits) one will with particular advantage all transistors 9, or. whose limit τ er, connect to the same reference voltage αηά (JiHse (z .

ORtGlNAL 209846/0066

Claims (1)

P ate η ta η s ρ r ü c fa e. iSlektr'uniscuer coin p ruler, df a d u r c Ij g e it e η η ζ e i e υ η e t, that the νuendeten ... ·. · wintersctjaltunken for the reduction of coin-type measurement signal values at least partly consist of two accommodation to be opened up, one of which is designed as an amplifier. 2. iviünzprüier ^ nacij claim '1, α a α urcb ^ e: - k shows that in the case of the i-window limiting circuit designed as an amplifier, the strengthening of a transistor in the areas between -. Saturation and dperruii & or vice versa - d.' u.in his 3ο _ώ . ^ -. oetrieb - is exploited. ■ o. lilünzprüi'er according to claims I or δ, dadurcut: e ir. e im-ζ eic u aet that at the axs hardened trained>. omparatorscbaitunä effected v / ird. ■ · - ,. Münzpi "aier after ..insprucL · 1 or ^, thereby g e - is. e η η ζ ei c b net that at the old. v'erttäriier ausye- W formed ^ dsterbeyrenzuriBsscliaitiui ^ the / strengthening -öurco an operational amplifier is effected. Münzprüxer nacii .anspi'ucn 1 to · _; -. , ο a ο urc ti g e K e nnz eic η η et. that oie second .. 'eiisterbeijrenzun ^ öSCi / oituns bei jirregun; -; the effect of the first (i'erstär «end> ... enaterbeyrenzungsschbaitung diretit ooer inüire ^ t developed. 6. iiiünzprüier nac-ij an ooer uieiireren der j - .. nspracbe 1-, υ a - cf urc ι) r. e ..ν e η η zei <j u η et, aass vexCeu ieu be:.: i "enzunjsscj) axtuncen oat; ei ^ Q'ycj, .. i ^ ue -,. « _, ±. preamp ^ r ^ i mc- to 'ei. aurv-wire. 209846/0066 7. coin validator according to one or more of claims l- ~, thereby g e k e η η ζ e i c Ii η e t that only the Reinforcing .window delimitation construction the actual iaießsignai is supplied and the second window limitation circuit evaluates the analog signal amplified by the first. B. Münzprüier according to claim 6 or '/, characterized .g e k ennz e i c b η e t that when there are several measuring areas (coin-annotation areas) different window widths through different amplifications of the window limiting circuit (designed as an amplifier) can be set and thus a normalized stroke of the output signal of each measuring range is brought about despite different window widths. ό. A validator according to claim ei, characterized in that the limiting voltage for the lower window limiting circuit (if there are several window circuits: the common limiting voltage) is used as the zeroing voltage for the zero point and / or full scale adjustment) of a setting measuring device to be connected. 20984 6/00 6