IMAGE DISPLAY METHOD FOR TROLLEY LINE SLIDING SURFACE

PURPOSE: To enable a trolley line to grasp a state of abrasion on a sliding surface in detail as well as to accurately judge whether it is proper or not by making the sliding surface width data of the trolley line two-dimensional image data, and displaying these data on a monitor television after magnification. CONSTITUTION: At each scanning of a laser beam, a sliding surface signal to be outputted from a light receiver 311 is inputted into a write control circuit 53 via an analog-to digital converter 321 or the like. Writing and reading to two image memories 54a and 54b are alternately performed, and the read sliding surface data are enlarged of the width by a width expansion circuit 56 and analogized by a digital-to-analog converter 57, and then it is made into a video signal which is inputted into a monitor television 333 and enlarged of the sliding width and displayed, and an electric pole mark and the number from a microprocessing unit(MPU) 326 are written side by side on this display. Since an image displayed on the monitor television 333 is enlarged of the sliding surface width as far as several times, an abrasion state of the sliding surface is fully observed, and thereby a fact of whether it is proper or not is accurately inspectable.