Patent ID: 9015953
Filing Date: 2015-04-28
Classification: G01B,G01L

Abstract:
1. A touch probe for checking position or dimensions of a part in machine tools or measuring machines comprising: a support frame comprising: a movable armset that is partly housed in the protective casing and includes an arm carrying a feeler adapted to touch the part to be checked; a thrust device arranged between the support frame and the movable armset for urging the movable armset against the bearing and locating area; a constraint and positioning system between the movable armset and the support frame at the bearing and locating area; a detection device with a laminar piezoelectric transducer connected to the support frame and adapted to provide a signal in consequence of a force applied to the feeler; and processing means connected to the detection device and adapted to process said force signal, to compare the latter to a threshold value, and to provide a touch signal indicative of a touch occurring between the feeler and the part to be checked, wherein the processing means include a processing system adapted to provide an average of a plurality of detected values of said force signal and to consequently dynamically vary said threshold value.