POTATO GRADER Russian patent published in 1996 - IPC

FIELD: agricultural engineering. SUBSTANCE: machine has screen 1 in form of truncated cone installed on frame 2 by means of three support rollers 3 getting into slot of guide ring secured over perimeter of screen larger base. Screen longitudinal axis is inclined to horizontal plane through angle of 45-48.5 degrees. Screen is installed between feeding and discharge conveyors. Feeding trough 12 is brought into screen space at side of larger base whose diameter is within 170 and 180 cm and has sinusoidal shape edge. Screen is set into rotation by geared motor with one of lower roller 3 fitted on geared motor shaft. Upper roller is secured on frame crossmember spring-loaded in vertical plane. EFFECT: enhanced operation reliability and convenience. 3 cl, 5 dwg