| 摘要 |
PURPOSE:To easily select a tightening head, by mounting a plural number of multi-spindle tightening heads to an annular rail, moving one of the tightening heads to a work position and connecting said one tightening head to a driving source through a connecting head. CONSTITUTION:In accordance with a kind of works (a), (b), carried in on a machining table 2, optional one of the plural multi-spindle tightening heads 4, mounted on an annular rail 3, is selectively placed on a liftable movable rail 3a by an indexing device 10. A Geneva mechanism is used for the indexing device. If the above described head 4 is selected on the movable rail 3a, a connecting head 19 is lowered and connected to a compressed air source, not shown in the drawing, then the movable rail 3a is lowered by a cylinder 7, and tightening work of the works (a), (b) can be performed. |
