Patent ID: 7555973

Claim:
An automatic lathe which has a tool post and a spindle configured to relatively move in a spindle axis line direction and which machines a material gripped by a chuck at a tip of the spindle by a tool installed on the tool post, comprising: a head stock configured to move forward and backward; the spindle rotatably supported on the head stock and having a through-hole which allows a rod-like material to be inserted therethrough; the tool post equipped with the tool to machine the material gripped by the chuck of the spindle; a guide bush support table disposed closer to a tip side of the spindle than the head stock; support table fixing means for positioning and fixing the guide bush support table at a specified position on a bed; a guide member which is rotatably supported on the guide bush support table and which is regulated so as not to move forward and backward with respect to the guide bush support table and in which a throughhole is formed so that the spindle is inserted therein; a guide bush detachably fitted to a tip of the guide member; driving means provided in the guide bush support table to rotate the guide member together with the guide bush; rotation transmission means for transmitting rotation of the guide member to the spindle; spindle moving means for moving the spindle forward and backward together with the head stock inside the guide member; and spindle fixing means for preventing the spindle from moving forward and backward with respect to the guide bush support table, and positioning and fixing the spindle at a specified position on the guide bush support table when the guide bush is removed from the guide member.