FIELD: agricultural engineering. SUBSTANCE: device has carrier 9 made of two kinematic links 12 and 13 coupled by 5-th class pair 14 and moving relative to each other within range limited by stops 15. Range is formed by trajectory of motion of hinge joint 10 of carrier 9. Hinge joint is connected with screen 3. 5th class pair 14 is made in form of cylindrical rotating pair and is arranged out of line connecting hinge joints 10 and 11 of ends of carrier 9 connected with turnable support 8. Stop made in form of pin is rigidly connected to one of kinematic links 9 and is arranged in closed slot of body of other link. EFFECT: enhanced reliability of operation. 4 cl, 4 dwg
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