Method for measuring the tensile stress of a running web

Details Method for measuring the tensile stress of a running web Method for measuring the tensile stress of a running web

B - Operations, Transporting

65

H

B65H 23/188 (2006.01) B65H 26/04 (2006.01)

Patent

CA 2642378

In a method for measuring the tensile stress of a running web, force sensors (7) are connected in the form of a Wheatstone bridge (11). An amplifier (18) amplifies a diagonal voltage (17) of the Wheatstone bridge (11) . In order to be able to detect whether at least one of the force sensors (7) is defective, the Wheatstone bridge (11) can be loaded using at least one resistor (26) by means of at least one switch (24, 25). Comparing the measured values, with loading, with the measured values, without loading, determines whether the force sensors (7) of the Wheatstone bridge (11) are functional. Otherwise, an active error signal (28) is output.

L'invention concerne un procédé pour mesurer la tension d'une bande de matériau défilante, consistant à connecter des capteurs de force (7) sous la forme d'un pont de Wheatstone (11). Un amplificateur (18) amplifie une tension diagonale (17) du pont de Wheatstone (11). Afin de pouvoir déceler si au moins un des capteurs de force (7) est défectueux, le pont de Wheatstone (11) peut, par au moins un commutateur (24, 25), être chargé au moyen d'au moins une résistance (26). En comparant les valeurs de mesure sous charge avec les valeurs de mesure sans charge, on détermine si les capteurs de force (7) du pont de Wheatstone (11) sont fonctionnels. Faute de quoi, un signal d'erreur actif (28) est délivré.

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