| 摘要 |
PURPOSE:To prevent erroneous running operation due to a laid iron plate or the like by not detecting mark plates or not performing the processing operation based on detection in a prescribed section of a running path. CONSTITUTION:When an unattended carriage 1 reaches the entrance of a laid iron plate 8 and the detection signal of a cord 9 to be detected is inputted from an entrance detecting pickup coil 6, a CPU invalidates the processing operation based on the inputted detection signal from a mark plate detecting sensor 4. Consequently, the carriage 1 is run on the iron plate 8 in accordance with running contents indicated in a mark plate group 5B. When the carriage 1 passes the iron plate 8 and the detection signal of the cord 9 is inputted from an exit detecting pickup coil 7, the CPU releases the invalidation of the processing operation based on the detection signal from the sensor 4 and validates this processing operation. Thus, the carriage is prevented from being run off the original running contents because of the existence of the iron plate 8 in a prescribed section L demarcated with the cord 9.
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