FIELD: agricultural engineering. SUBSTANCE: left-handed and right-handed bell-cranks are hinged to the machine frame. The longer arms of the bell-cranks are provided with feeling prods. Ends of the shorter arms are spring-loaded against the machine frame, and they are linked with a bell-crank having arms equal in length. The bell-crank axle is located on the end of the longer arm of an additional bell-crank. The axle of rotation of the latter is located on the machine frame, and the end of the shorter arm is hinged to a spring-loaded gate valve. The travel of the prods toward the rows is limited with rests that are in engagement with the shorter arms of the bell-cranks. EFFECT: convenience in machine operation. 1 dwg
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