| 摘要 |
PROBLEM TO BE SOLVED: To ensure the detection of substantial position of a box and position of center of hole with one detector by enabling the detection by a metal sensor installed in the box detector to detect a first part to be detected, and enabling a magnetic sensor to detect a second part to be detected. SOLUTION: First, in a wide wall surface, a box detector A is moved up and down, and right and left to detect a pair of metal foil pieces F, namely one position of a first part to be detected, and then the other, thereby detecting a substantial position of a box B on the rear side of wall. When four metal sensors detects both ends of the metal foil pieces F, all four detection confirmation lamps L1 are put on. Then, a magnet M, namely a second part to be detected is detected by a magnetic sensor of the box detector A, and then a detection L2 lamp is put on. The magnet M is located at the center of circular hole. The metal sensors detect only the metal foil pieces F while the magnetic sensor detects only the magnet M, and accordingly a sure detection is attained without mixing-up. |
