Vibration control device for sewing machine

Abstract

A vibration control device for a sewing machine capable of actively reducing the vibration generated on a bed of the sewing machine by the rotation of an arm shaft, the vertical reciprocation of a needle bar, and other vibration inducing movement without reducing a mechanical strength of the sewing machine and adopting any complex designs. The vibration control device includes a sync signal generating device for generating a sync signal in synchronism with rotation of the arm shaft, a vibration sensor for detecting vibration generated on the bed, a control unit for setting a transfer function, and a piezoelectric actuator for generating control vibration. A control signal interfering with the vibration detected by the vibration sensor is generated by the control unit so as to minimize a detection signal from the vibration sensor according to the sync signal, the detection signal, and the transfer function. Then, the piezoelectric actuator is operated according to the control signal to thereby generate the control vibration, thus actively reducing the detected vibration.

Dependencies are inferred from the claim text.