Check-actuated control mechanisms – Including means to test validity of check – By testing material composition
Patent
1998-09-10
2000-05-23
Bartuska, F. J.
Check-actuated control mechanisms
Including means to test validity of check
By testing material composition
G07D 508
Patent
active
060655828
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a coin-checking arrangement as set forth in the classifying portion of claim 1.
The arrangement is used in coin-checking units of automatic sales and service apparatuses such as for example telephone stations, automatic drinks- or cigarette-dispensing apparatuses and so forth. The coins are often of a sandwich-type structure, the layers of which comprise differently alloyed, nickel-bearing metals, for example CuNi and Ni.
An arrangement of the kind set forth in the opening part of this specification is known from EP 0 304 535 A1, describing a coin-checking arrangement in which a first coil detects the alloy and a second coil detects the thickness of the coin, wherein the second coil comprises two coil halves which are electrically connected in series or parallel in phase opposition or in in-phase relationship. The coils are each a part of a specific resonance oscillating circuit which is fed with an alternating current by a current source.
The object of the present invention is so to improve the known arrangement that at least the combinational effect of the coin thickness and a sandwich structure of the coin can be ascertained and internal coin layers with 4%, 6% and 8% nickel in a surrounding enclosure of CuNi can be detected, which permits clear identification of the coin in question.
In accordance with the invention the specified object is attained by the features recited in the characterising portion of claim 1. An advantageous configuration of the invention is set forth in the appendant claim.
An embodiment of the invention is described in greater detail hereinafter and illustrated in the drawing in which:
FIG. 1 shows a diagrammatic perpendicular longitudinal section of a coin passage,
FIG. 2 shows a diagrammatic cross-section of the coin passage,
FIG. 3 shows a diagrammatic horizontal longitudinal section of the coin passage, and
FIG. 4 shows a series circuit in phase opposition of two coil halves of a coil.
An arrangement for checking coins 1 has a coin passage 2. along which a plurality of coils are arranged in succession in the direction of movement of the coins 1. It is assumed in FIGS. 1 through 3 that there are two coils 3 and 4. The coil 4 serves to ascertain the thickness of the coins 1 to be checked and preferably comprises a first coil half 4a and a second coil half 4b which, in the arrangement according to the invention, are both electrically connected in series in phase opposition (see FIG. 4) and each have a ferromagnetic core 4c and 4d respectively. The coil 4 is a part of a resonance oscillating circuit (not shown) which is fed by a current source with an alternating current which produces an alternating magnetic field in the ferromagnetic cores 4c and 4d of the coil halves 4a and 4b. The coil 3 in contrast serves to ascertain the alloy composition of the coins 1 to be checked and is disposed on the same side of the coin passage as the coil half 4b. The coil 3 is a part of its own resonance oscillating circuit (not shown) which is fed by a current source with an alternating current which produces an alternating magnetic field in a ferromagnetic core 3a of the coil 3. The coin passage 2 has a bottom surface 5 which serves as an inclined plane and at least one side wall 6. It is assumed in FIGS. 1 through 3 that there are two parallel side walls 6 and 7. When a coin checking operation is effected the coins 1 roll or slide under the influence of the force of gravity inclinedly downwardly on the inclined plane formed by the bottom surface 5, and in so doing bear against the side wall 6 along which they therefore move. For that purpose the side wall 6 is slightly inclined with respect to the perpendicular so that, as they move along, the coins 1 bear against the side wall 6 under the influence of the force of gravity. To reduce friction the side wall is preferably provided with projecting longitudinal ribs in the direction of the movement of the coins 1 along the coin passage although this is not shown in the drawing. In that case, as the coins 1 roll or slide alo
REFERENCES:
patent: 3986104 (1976-10-01), Randolph
patent: 4742903 (1988-05-01), Trummer
Bartuska F. J.
Electrowatt Technology Innovation AG
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