PURPOSE: To immediately detect a defect in comb teeth of an on-off getting plate by providing a hole in a cleat groove bottom of a footboard, supporting a point end of an operating lever to a supporting point, protruding the point end of the operating lever fitted to the hole, and pressing dot the operating lever by the comb teeth of combing a cleat to pass, so as to actuate a detector in a reverse side of the footboard. ;CONSTITUTION: A single footboard is selected of the many footboards in an escalator, and in cleat grooves 8 of quantity (n) parallelly provided along a running direction in an upper surface of this footboard 4, holes 9 are respectively formed, to insert a riseup part of an L-shaped operating lever 11 of providing an operating wheel 10 in the point end, to each hole 9. In this operating lever 11, its horizontal part is swivelably supported pivotally to a point 12, and the other end part side is elastically supported by a spring. A limit switch Ln is arranged downward this operating lever 11, and in the case of breaking cleat groove wiping comb teeth 7 provided in the point end side of an on-off getting plate set up in a gate of the escalator, since the limit switch Ln is not actuated without swiveling the operating lever 11, a lamp is lighted to display a defect through a control unit.;COPYRIGHT: (C)1994,JPO&Japio
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