Importance

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Abstract

The feeler in the tooth flank profile measuring apparatus for determining the roughness of the tooth flank surface comprises a Hall-effect sensor placed in a static magnetic field between two permanent magnets instead of the otherwise conventional piezo-electric or inductive measuring system. One of the two permanent magnets is adjustably mounted at one end of a feeler rod or arm which carries at its other end a feeler tip for scanning the tooth flank surface. A conventional cross-spring joint serves to rotationally mount the feeler rod or arm. The cross-spring joint need not be distorted or loaded for adjusting the bearing load of the feeler tip because there is provided for this purpose a magnetic bearing load adjustment device. The magnetic bearing load adjustment device not only compensates for the biasing force of the two permanent magnets of the measuring system, but generates a selectable bearing load for the feeler tip by overcompensating for the biasing force of the permanent magnets of the measuring system. This selectable bearing load for the feeler tip can be already measured during the adjusting operation. Since this bearing load is generated by the magnetic fields and since the cross-spring joint need not be distorted, the feeler has a substantially greater mobility and a substantially wider frequency response compared to known feelers. The feeler additionally has a simpler mechanical structure and the circuitry in the evaluation circuit is substantially less complicated in comparison to known feeler arrangements.

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First Claim