Patent ID: 7827856

Claim:
A roughness scanner ( 1 ) in movable scanning relationship with a workpiece surface ( 16 ) in an advancing direction ( 15 ), comprising: a scanning arm ( 4 ) having a scanning needle ( 6 ) mounted at one end thereof, a skid carrier ( 3 ) having an end ( 18 ) supporting a skid ( 10 ) with the scanning arm ( 4 ) extending along the skid carrier ( 3 ), the skid ( 19 ) being arranged so as to form a space ( 26 ) between the skid carrier ( 3 ) and the skid ( 19 ) being delimited at least at one side by a guide plate ( 20 ) having an opening ( 21 ) through which the scanning needle ( 6 ) extends, said space ( 26 ) being fully open above the guide plate ( 20 ) at least toward one side disposed in the advancing direction ( 15 ) and/or disposed in opposition to the advancing direction ( 15 ).