| 摘要 |
PURPOSE:To reduce the cost of gyration controlling system for the turn-over of a machine as far as possible, by setting a seedling detection area of a sensor within a specific range and starting the steering operation toward the restoration direction when a seedling is detected in the inside of gyration radius with the sensor. CONSTITUTION:The seedling detection area E of sensors S, S attached to each of the left and the right soil-preparation floats 9, 9 is set to a fan-shaped form directing toward the front of the machine and extending to the right and left directions of the machine. When the gyration of the machine is started upon the approach of the machine to a ridge 20 in a field, the front part of the machine is tilted by a specific angle and the gyration of the machine is continued by a controller in a non-induced state. At the same time, the controller waits the input of a seedling detection signal from the sensor S within the gyration radius. When a seedling detection signal is inputted from the sensor S, the front part of the machine is steered to the restoration direction by the controller and the machine is automatically driven in a manner so as to follow a seedling row according to the signal transmitted from the sensor.
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