Digital sheet-thickness measuring apparatus

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271262, 271264, 27126501, G01B 706, G01B 1106

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active

057128049

ABSTRACT:
The invention concerns an apparatus for digitally measuring the thicknesses of sheets passing between a roller (5) fixed in position and a sensor roller (6) biased toward the fixed roller (5), said apparatus comprising a transducer (2) with at least one input winding, one output winding and with an element (17) sensitive to the position of the sensor roller (6), the transducer input being fed from an oscillator (1). A digital processing unit (4) is connected to the output of the transducer (2) and, on the basis of two measurements, one in the absence of a sheet and the other in the presence of a sheet, issues a digital value of the sheet thickness obtained from the subtraction of the said two measurements.

REFERENCES:
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patent: 4559452 (1985-12-01), Igaki et al.
patent: 4715007 (1987-12-01), Fujita et al.
patent: 4753433 (1988-06-01), Rodi et al.
patent: 4836528 (1989-06-01), Geiser
patent: 5011128 (1991-04-01), Tsuji
patent: 5075622 (1991-12-01), Konii et al.
The Soviet Journal of Nondestructive testing, vol.23, No. 7, Juillet 1987 New York, USA, pp. 467-471.
Patent Abstracts of Japan, Japanese Patent Application No. 56-112602.
Patent Abstracts of Japan, Japanese Patent Application No. 63-016215.

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