Grain sorter

A grain sorter comprising:

• a machine frame;
• at least one grain sorting board having a coarse surface;
• and a device for moving the grain sorting board in swinging movement including a mounting mechanism comprising a pair of pivotal links connected to a lower end of the grain sorting board and another pair of pivotal links connected to a higher end thereof for mounting the grain sorting board for swinging movement on the machine frame in such a manner that the grain sorting board is inclined in one direction at a certain angle of inclination with respect to the horizontal, a swinging mechanism for moving the grain sorting board in swinging movement having a rotary shaft supported by the machine frame and including an eccentric portion for moving the grain sorting board in swinging movement at a swinging angle larger than the angle of inclination of the grain sorting board, and a mechanism for adjusting the angle of inclination of the grain sorting board operatively connected to the mounting mechanism;
• wherein the improvement resides in that the mechanism for adjusting the angle of inclination of the grain sorting board is incorporated in the device for moving the grain sorting board in swinging movement within the limit set by the heights of said mounting mechanism and said swinging mechanism to enable the center of gravity of the grain sorting board to be disposed at a low level.