a device for measuring and regulating a length between a first part and a second part fixed machinery 1 car 2 mobile with respect to the first.the device includes a flexible support divisions 3, whereby a tape closed itself, guided and placed in tension by two elements of reference 7, 8.linked by a leader 6 with the second part of the car and esplorabile through a unit 5 sets the exploration machine 1.according to the invention, a base body 11, composed of basic elements 9, 10, is applied to the part of the fixed machine 1.while on the base body 11 are mounted swivel elements of reference of 7, 8, and by the same forces are absorbed by the tension support to division 3.the base body 11 is arranged in a box to protect 17 fixed to the car, and it is bound to a fixed point and fixed way.however, mobility in longitudinal direction of the support in division 3, at least one fixed point.
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