Patent ID: 6621241
Filing Date: 2003-09-16
Classification: F16F,G05B

Abstract:
An apparatus for reducing the vibration transferred to a machine frame by an oscillating tool assembly supported by said frame, said tool oscillating along a first axis, comprising:a linear sliding means mounted to said frame, a weight mounted on said sliding means, a driving means coupled to said weight and arranged to oscillate said weight on said sliding means along said first axis in response to a first drive signal, and a drive circuit which provides said first drive signal and which receives a first input which is proportional to the acceleration of said oscillating tool assembly and a second input which is directly proportional to the velocity of said oscillating tool assembly, said drive circuit arranged such that said drive signal varies with said first and second inputs to oscillate said weight such that vibration induced in said frame by said oscillating tool is reduced, wherein said oscillating tool assembly is oscillated with a voice coil assembly responsive to a second drive signal, said drive circuit's first input varying with said second drive signal.