Apparatus and method for controlling a longitudinal shifting of an elongated piece along a predetermined length

摘要

The method and apparatus are for controlling a longitudinal shifting of an elongated piece along a predetermined length SL as said piece moves transversely within a plane at a given speed PS. The apparatus comprises a longitudinal arm having a given length PL pivotable within the plane to shift the piece; a flexible link operatively mounted around the arm to contact the piece as the arm is pivoted to shift the piece; a controllable pivoting means for pivoting the arm according to an angle theta determined in relation to the predetermined length SL and the given length PL; and a controllable driving means for driving the flexible link around the arm according to a speed SS determined in relation to the speed PS of the piece and the angle theta so that the longitudinal shifting is controlled.