| 摘要 |
PURPOSE: A rack length measuring device and a method thereof are provided to discharge air from a nozzle arranged in the left side of a camera module so that the upper surface of the rack becomes clean. CONSTITUTION: A rack length measuring device(10) comprises a body(20) and a camera(40). The body moves along a longitudinal direction of the extended rack. The camera is installed in one side of the body to take a photograph of a screw thread of the rack. Two or more screw threads are comprises in FOV(Field Of View) of the camera. The rack length measuring device comprises a thermometer module(30) measuring a temperature of the rack. |
