| 摘要 |
The invention relates to a triangular-shaped prism A, fixed at the end of an impeder B by a rod C. A conduit D will supply the pressurised gas. The cover E will serve for shaving the bead of the tube, which will move forward in the opposite direction from blowing, according to the arrow F, and a dish G equipped with a slot at its base will allow the coolant water of the impeder to escape, the arrival of which will take place via the conduit H and will protect the walls of the latter against the sparks which would risk adhering at the top. <IMAGE>
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