| 摘要 |
A high speed automatic lathe of the movable spindle head type has a quill spindle comprising a hollow spindle provided with a collet chuck rotatable in a non-rotating but axially movable quill. A tool frame for supporting a plurality of tools is made in one piece with a work spindle frame in which the quill spindle is mounted for axial movement thereby assuring rigidity of construction and accuracy of positioning of the tools relative to the spindle. The spindle is rotated at high speed by a high frequency motor mounted in the work spindle frame in axial alignment with the spindle and provided with an axial bore for passage of a work piece through the motor to the spindle. The quill spindle is movable in an axial direction relative to the motor to provide feeding movement of the work piece while maintaining a direct drive connection between the spindle and the motor. Axial movement of the quill spindle is controlled by a plurality of cooperating cams, thereby simplifying cam layout machine. Cam operated means is also provided for opening and closing the chuck of the spindle while the spindle is rotating at high speeds and without interfering with axial movement of the spindle. The spindle, the cam shaft and a tool attachment having tools for machining the end of a work piece are driven by separate motors thereby avoiding gear boxes and interconnecting shafting.
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