System for testing paper money and the like
AssigneeOesterreichische National Bank
InventorsFritz Gartner, Erich Berger
Life of this patent
Estimating the term…
Abstract
To test the genuineness and/or condition of dollar bills or other substantially identical papers, one or more thickness gauges are positioned in the path of these papers and determine the deviations, if any, of the thickness of a passing specimen from a predetermined value or from the thickness of a reference specimen scanned concurrently therewith. The measured deviations are fed into a processor which counts positive or negative deviations within a multiplicity of incremental periods and determines the nature of any irregularity from the count of deviations of either sign. With three gauges measuring thickness along as many parallel tracks, the system may discriminate among such irregularities as gaps, overlappings, adhesive tape and dog-eared corners.
Claims24
A method of testing specimens of sheet material against a standard, comprising the steps of successively measuring the thickness of a test specimen at a multiplicity of closely spaced locations along at least one scanning line between opposite edges thereof, comparing the measured thickness with a reference value at each of said locations, correlating the results of comparison to establish a pattern of distribution of positive and negative deviations of said measured thickness from said reference value along said scanning line, and classifying the test specimen according to the distribution pattern thus obtained.
A system for testing specimens of sheet material against a standard, comprising:
- thickness-gauging means positioned for coaction with a test specimen;
- transport means for relatively displacing said thickness-gauging means and said test specimen along at least one scanning line extending from a leading edge to a trailing edge of the latter;
- timing means establishing a multiplicity of successive incremental periods during a traverse of said thickness-gauging means from said leading edge to said trailing edge;
- logical circuitry connected to said thickness-gauging means and to said timing means for storing data on deviations of the thickness of said test specimen from a reference value during any of said incremental periods throughout said traverse;
- and
- discriminating means connected to said logical circuitry for classifying said test specimen according to the pattern of distribution of its thickness deviations from said reference value along said scanning line.
A system for testing specimens of sheet material against a standard, comprising:
- at least one electromechanical pressure sensor engageable with a test specimen, said pressure sensor including a leaf spring, mounting means clamping one end of said leaf spring, the other end of said leaf spring being provided with a specimen-engaging formation remote from said mounting means, and transducer means operatively coupled with said leaf spring for translating a deflection thereof from a normal position into a bipolar electrical signal;
- transport means for relatively displacing said pressure sensor and said test specimen along a scanning line extending from a leading edge to a trailing edge of the latter;
- timing means establishing a succession of incremental periods during a traverse of said pressure sensor from said leading edge to said trailing edge;
- a source of reference voltage for the thickness of said test specimen;
- comparison means connected to said pressure sensor and to said source for determining deviations of said signal from said reference voltage during any of said incremental periods;
- and
- discriminating means connected to said comparison means and to said timing means for classifying the test specimen according to the distribution of said deviations.
Dependencies are inferred from the claim text.