Patent ID: 6449861
Filing Date: 2002-09-17
Classification: G01B

Abstract:
A head for checking linear dimensions of parts in machine tools or measuring machines, said head comprising a support structure, a movable arm-set including an arm carrying a feeler for contacting the part to be checked, a bias device arranged between the support structure and the movable arm-set and adapted to apply to the movable arm-set a force along a geometrical axis and a moment of rotation about the same geometrical axis, a first constraining system having a structure with rotational symmetry about said geometrical axis and a second constraining system of a type different from that of the first constraining system, the first and the second constraining systems being arranged between the support structure and the movable arm-set, for eliminating, under the action of the bias device, the six degrees of freedom of the movable arm-set, the degrees of freedom eliminated by the first constraining system including the translation of the movable arm-set along said geometrical axis, and a detecting device for providing a signal depending on the position of the movable arm-set, wherein the first constraining system and the second constraining system are totally with force closure.