Patent ID: 6169290
Filing Date: 2001-01-02
Classification: G01B

Abstract:
A measuring device for an envelope surface of a generally cylindrical object journalled rotatably in a machine stand of a paper machine, said measuring device comprising: a measuring stand arranged generally parallel to the axis of the cylindrical object; a linearly movable measuring carriage for traversing along said measuring stand; means for measuring the envelope surface, said means being mounted to said carriage to traverse along the length of the cylindrical object and thereby measure the envelope surface; a straightness reference device for providing a straightness reference for said measuring means, said straightness reference device comprising; a laser transmitter for creating a straight laser beam, and a receiver detector for receiving the laser beam, one of said transmitter and said receiver detector being supported by said carriage and the other being supported at a fixed position adjacent the cylindrical object, said receiver detector being capable of providing a signal indicative of the position of incidence of the laser beam on the receiver detector such that a straightness reference is established; and an elongate protective device arranged along the measuring stand for protecting at least a portion of the laser beam from external influences.