VIBRATORY FEEDER WITH NATURAL FREQUENCY ADJUSTMENT

摘要

An article feeder having a frame mounted on a base is disclosed. A container which receives and dispenses articles is secured to the frame. The frame and container assembly constitute one mass of a two mass system, and the base constitutes the other mass of the system. Several sets of main leaf springs are secured by clamps between the frame and the base to support the frame and container for rotational oscillation by a motor mounted on the base. A set of auxiliary leaf springs, smaller than the main leaf springs, is secured to the clamps of each set of main leaf springs and acts in parallel with each set of main leaf springs to provide the total spring coupling between the frame and container assembly and the base. The auxiliary leaf springs are added or removed individually to change the torsional natural frequency of the two mass system in small increments without disturbing the sets of main leaf springs.