Method and apparatus to check the acceptableness of the state of

Details Method and apparatus to check the acceptableness of the state of Method and apparatus to check the acceptableness of the state of

1991-12-06

1993-05-25

Wieder, Kenneth A.

Measuring and testing

Sheet, woven fabric or fiber

73160, 340675, 340677, 324700, 324701, 324715, 324718, B65G 4302, G01N 2704

Patent

active

052129829

ABSTRACT:
A method and apparatus for carrying out the checking of the state of wear of a covering fabric in a driving belt (2) mounted on a plurality of pulleys (3, 4, 5) by measuring the electric resistance variations of the belt fabric. The apparatus provides that at least two of the pulleys (3, 4, 5) should be electrically insulated with respect to each other and connected to an electric circuit (20) designed to apply an electric voltage to said pulleys in order to carry out the measuring of the electric resistance of the fabric exhibited by belt stretches (A, B) comprised between the pulleys themselves. The electric resistance thus found lends itself to be compared with predetermined resistance values corresponding to different states of wear of the belt (2) fabric. The work surface of the belt (2) is coated with an electrically conductive fabric (12) acting by contact on the pulleys (3, 4, 5) and having characteristics of tensile strength.

REFERENCES:
patent: 3541437 (1970-11-01), Ahrweiler
patent: 3576425 (1971-04-01), Owen
patent: 3636442 (1972-01-01), Doi
patent: 4300094 (1981-11-01), Piso
patent: 4371363 (1983-02-01), Cicognani et al.

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