Patent ID: 6459281
Filing Date: 2002-10-01
Classification: G01B

Abstract:
A head for the linear dimension checking of pieces in machine tools or measuring machines, comprising:a support structure; a movable arm-set including an arm carrying a feeler for contacting the piece to be checked; a bias device arranged between the support structure and the movable arm-set; a constraining system arranged between the support structure and the movable arm-set and including a first surface with rotational symmetry and a second surface with rotational symmetry, both these surfaces with rotational symmetry being urged to contact each other by a force provided by the bias device; and an electric detecting device, for providing a signal depending on the reciprocal position of the first and second surfaces with rotational symmetry, including a first electrically resistive portion arranged in the support structure and a second electrically resistive portion arranged in the movable arm-set, wherein said first and second resistive portions define said first and second surfaces with rotational symmetry and are substantially electrically connected in parallel in the condition according to which said first and second surfaces with rotational symmetry are in abutment.