PROBLEM TO BE SOLVED: To warn life of an open belt outside by mechanically detecting the life before the open belt is cut off.;SOLUTION: Life of an open belt 1 is noticed in advance by outputting an alarm at the time of detecting breakage or a change of resistance value by a breakage detection means 6 to detect breakage of an electric current on a current-carrying wire 5 or a voltage detection means to detect applied voltage by a change of electric resistance of this current-carrying wire by using at least more than one of conductors 2 as the current-carrying wire 5 on the open belt 1 burying a plural number of the conductors 2 in the longitudinal direction to bear tensile strength of the belt.;COPYRIGHT: (C)2000,JPO
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