Agricultural machinery null for paddy field

摘要

PURPOSE:To provide the title machine intended to uniformized the work depth for transplantation, inoculation, etc., so designed that a float and hydraulic cylinder are mutually connected in such a manner that a working device ascends when the tip of the float and the working device come near; on the contrary, when said tip and said device get apart, the device descends. CONSTITUTION:When the position of a plow sole gets deep and the distance between the plow sole and mud surface gets large, a working device 19 descends toward a float 26 sliding on the mud surface, both the device and float coming near. In response to a signal representing this approach, a hydraulic cylinder 21 is fed with oil and the working device 19 ascends to a proper position. On the contrary, when the position of the plow sole gets shallow and the above distance gets small, said device 19 ascends away from said float 26, both the device and float getting apart. In response to a second signal representing this separation, the oil in the hydraulic cylinder 21 is drawn off and the working device 19 descends to a proper position.