| 摘要 |
A spindle head for machine tools includes a housing (16), a spindle (12) having a through-hole (12b) formed therein and a tapered portion (12c) at one end thereof for receiving a tool holder (8), a bearing means (14, 44) for supporting rotatably the spindle (12) in the housing (16), a draw-bar (30) placed in the through-hole (12b) of the spindle (12), a collet (36) connected to the draw-bar at its one end for holding the tool holder (8), and means (20, 28) for moving the spindle (12), the bearing means (14, 44) having a concave portion (14c). The spindle (12) has a convex portion (12a, 42a) corresponding in shape to the concave portion (14c). The concave portion (14c) of the bearing means (14, 44) cooperates with the convex portion (12a, 42a) of the spindle (12) so that the bearing means (14, 44) can support the spindle (12) in both radial and thrust directions. |
