TRACK LINING REFERENCE BEAM PROJECTOR

摘要

A lining system and method for aligning a length of railroad track extending between two locations, the amount of error in the alignment of the track at these locations having been determined. A reference beam projector is mounted on a car to travel over the track ahead of the track lining machine. A beam receiver is mounted on another car behind the machine on correctly aligned track. A shadowboard is mounted on the machine to indicate the position of the track being aligned to the receiver. A potentiometer having a linear resistance and a wiper is employed to interpolate the amount of error in the alignment of the track at the location of the projector. A voltage is applied to each end of the resistance, the amount of the voltage at each end corresponding to the error in alignment of the track at each of the two locations. The position of the wiper relative to the resistance corresponds to the distance travelled by the projector. The wiper is electrically connected to a differential amplifier which transmits a signal to an electric motor whenever the position of the projector relative to the optimum path for the track differs from a predetermined amount and then the electric motor adjusts the position of the projector accordingly.