| 摘要 |
The present invention is to provide a spindle structure of an ultrasonic machine which can reduce the number of assembling steps, can improve working accuracy, and can reduce heat generation due to an ultrasonic wave leakage during the working process. The spindle structure comprises: an ultrasonic vibrator 4 housed in a main body sleeve 3b formed in a spindle main body 3 rotationally driven, and a supporting horn 6 connected to the ultrasonic vibrator 4, wherein the supporting horn 6 comprises a main body 6a, a base portion 6c formed in a brim shape on an outer peripheral face of the main body 6a, an elastic cylindrical damping sleeve 6d formed by extending an outer periphery of the base portion 6c in the axial direction, a loose flange 6e and a fixing flange 6f formed on both ends of the damping sleeve 6d, and a buffer groove 6g formed on an outer peripheral face of the base portion 6c, wherein the loose flange 6e of the supporting horn 6 is disposed on the side of the ultrasonic vibrator 4 in a state that it is slidable to and has contact with an inner peripheral face of the main body sleeve 3b, and the fixing flange 6f is mounted on the main body sleeve 3b in a state that it is restrained in the axial direction.
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