This study deals with reducing of transmissive vibration force by the interference method. The improved mechanism of the machine is constituted as two degrees of freedom vibration system. Assuming to eliminate a coupling spring, natural frequencies of two mass-spring systems are tuned to the same value each other. Vibrations of two bodies in the mechanical system are always held out of phase independently of exciting frequency. Then a fundamental resonance disappears and the secondary resonance becomes the only resonance, because the system is divided into a pair of mass-spring system by a node in the coupling spring to be regarded as a common fixed end. The new type vibratory feeder for automatic parts assembly system has developed as one of application of the vibration reduction method.
