JPS6471601A - Ultrasonic vibration cutting device - Google Patents

Abstract

PURPOSE:To contrive adjustment of a tool in its vibrating direction by forming a recess in a node part of vibration of a torsional vibrator while providing an annular body having a stop screw, fitted to the recess, and giving tightening force to the annular body by a tightening unit surrounding this torsional vibrator. CONSTITUTION:When driving voltage is applied to an electrode plate 26, a torsional vibrator 20 vibrates symmetrically with the center axis, and a tool 37, provided in a position displaced from the center axis, vibrates in a manner wherein the tool 37 moves along the peripheral side surface of a tool holder 22. And fixing a torsional vibrating piece 21 by stop screws 47, 44 in a position of node parts N2, N3 of vibration to be held by uniform force from the peripheral side surface and fixed by a housing 60, no bad influence is given to a vibrating attitude further with a less amount of loss in vibration. By the structure thus obtained, displacing the center of gravity of the tool 37, even when it vibrates tiltingly in the peripheral direction, the tool can be adjusted in a manner wherein its vibrating direction is always aligned to the cutting direction.