Importance

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Abstract

An apparatus for non-contact gauging the thickness or variations in thickness of disc or sheet objects, for example banknotes, comprising at least two opposed gauges (1,2), between which the object (3) is intended to pass, and a recording or corresponding unit (10) for processing the gauging results. The apparatus is particularly characterized in that each gauge (1,2) of substantially known kind comprises a pneumatically operated gauge head (4,5), of which the end (6) facing toward the object (3) consists of a preferably axial-symmetric disc-shaped portion (6) with at least one central outlet aperture (7) preferably for compressed air, which portion (6) aerodynamically is designed so that a definite air flow through said outlet aperture (7) is corresponded by a definite distance to the object (3), that the gauge head (4) of at least one gauge (1) is movable to and from the object (3), and that a transducer unit (9) preferably for inductive measurement of said movement is provided and connected to said recording unit (10).

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First Claim