Apparatus for non-contact thickness gauging of disc or sheet obj

Details Apparatus for non-contact thickness gauging of disc or sheet obj Apparatus for non-contact thickness gauging of disc or sheet obj

1984-01-09

1986-04-15

Schor, Kenneth M.

Measuring and testing

With fluid pressure

Dimension, shape, or size

73 376, G01B 1304

Patent

active

045819181

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).

REFERENCES:
patent: 3285608 (1966-11-01), Lyman
patent: 3438244 (1969-04-01), Plumpe
patent: 3485095 (1969-12-01), Hirata et al.
patent: 3496744 (1970-02-01), Mizuno et al.
patent: 4292838 (1981-10-01), Larsen
PCT Publication WO81/01609 of PCT/US80/01531, published Jun. 11, 1981.

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