Check-actuated control mechanisms – Including means to test validity of check – By testing material composition
Patent
1992-01-06
1993-05-04
Bartuska, F. J.
Check-actuated control mechanisms
Including means to test validity of check
By testing material composition
G07D 508
Patent
active
052073076
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to coin testing apparatus of the kind comprising at least one magnetic inductor for generating or detecting an oscillating magnetic field with which a coin to be tested interacts.
BACKGROUND OF THE INVENTION
Many kinds of such apparatus are widely available commercially, and normally they use several such inductors for producing (and in some instances receiving) a plurality of magnetic fields which interact with the coins to be tested in different ways. The present invention concerns the structure of such inductors and their positioning within the apparatus, and reference is made to GB-A-1 452 740 and GB-A-2 094 008, for example, for further information as to how other aspects of such apparatus may be arranged and operated.
It is desirable, ideally, that the inductors having a particular function in each of the coin testing apparatuses manufactured to a given design should have identical operating characteristics. This is not achieved in practice due to tolerance variations in the actual construction of the inductors and in their assembly into the apparatuses.
Typically, an inductor comprises a core, frequently annular in shape, of high magnetic permeability material having a recess in its front face, the recess also being annular in the case of an annular core, and an inductive coil located in the recess.
U.S. Pat. No. 3,870,137 discloses (see its FIG. 6) such an inductor, in which the coil is on a former. The Applicants have regularly used such a design for many years, but there have been variations between the operating characteristics of different inductors. It has been found that this partly arises from the fact that, in assembling that type of inductor, it is usual for the former to be pressed or to fall until it contacts the bottom of the recess. Consequently any variations (as between one inductor and another) in the depth of the recess, or in the front-to-back dimension of the former, will result in related variations in the position of the front face of the coin relative to the front face of the core, and relative to the coin passageway side wall when the core is positioned against the side wall. These variations could affect the uniformity of performance between different inductors.
SUMMARY OF THE INVENTION
For the purposes of the present specification including the claims, the term "front face" will be used in respect of that face of the core which in operation faces towards a coin being tested, and also in respect of that face of the coil which faces towards the coin.
The invention involves positioning the front face of the coil in predetermined relationship to the front face of the core. The invention also involves positioning the front face of the coil in predetermined relationship to a structural part of the apparatus adjacent to a passageway along which coins to be tested pass, and hence in predetermined relationship to the passageway and also, ideally, to coins which pass along the passageway.
We have found that these are important factors in helping to achieve uniformity of operating characteristics as between all inductors made to a given design.
More specifically, the invention provides coin testing apparatus of the kind comprising at least one magnetic inductor for generating or detecting an oscillating magnetic field with which a coin to be tested interacts, wherein said inductor comprises a core of high magnetic permeability material having a recess in its front face for receiving an inductive coil, and an inductive coil which is carried on a former, has a front face, and is located within the recess, the inductor being mounted such that the front faces of the core and the coil face a structural part of the passageway along which coins to be tested pass, characterised in that the former is provided with radially extending abutment means fixedly located relative to the coil and extending between, and contacting both of, the front face of the core and said structural part, so as to determine the position of the front face of the coi
REFERENCES:
patent: 3870137 (1975-03-01), Fougere
Bartuska F. J.
Mars Incorporated
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