Sorting machine for bulbs or tubers, containing vibrating screens

摘要

A screen beating device is mounted beneath the screen (2), comprising a strip (18) extending at right angles to the machine length direction and joined to at least one arm (17) pivotably secured to a support (15) extending upwards to a trolley (9) located above the screen and movable backwards and forwards along rails (7) above the screen. The arm is connected to a drive mechanism (22, 23) mounted on the trolley for pivoting the arm so that the strip is moved up and down against the sieve. A sorting machine for sorting bulbs or tubers according to size comprises a frame for supporting a number of screens arranged one above the other and movable in the machine length direction. The screens comprise a frame and a woven wire fabric whose mesh size progressively increases, and can be moved over a restricted distance in both the horizontal and vertical directions. A screen beating device is mounted beneath the screen, comprising a strip extending at right angles to the machine length direction and joined to at least one arm pivotably secured to a support extending upwards to a trolley located above the screen and movable backwards and forwards along rails above the screen. The arm is connected to a drive mechanism mounted on the trolley for pivoting the arm so that the strip is moved up and down against the sieve.