WELD TRACKING MECHANISM

摘要

A system for automatically sensing lateral movement of a longitudinally moving weldment bead has two conical shaped contact rollers mounted on generally parallel shafts, generally at right angles to the weldment bead and driven by contact with the weldment bead. The rollers are mounted in opposite directions and define a null point when the roller diameters contacting the bead are the same. A pulse tachometer mounted on each shaft provides different signals when lateral movement of the longitudinally moving weldment bead away from the null point causes the rollers to rotate at different speeds. Electrical circuitry responsive to the different signals actuates a servo mechanism to move the bead to the null point.