| 摘要 |
An adjustable horn or mandrel-for a spiral pipe forming machine. Such machin es are made for continuously forming metal pipe from an elongated sheet of metal where the sheet is curled into adjacent helical convolutions in a multiple roll pipe forming head. The head includes a mandrel, and in accordance with the invention a mandrel mount is provided for vertical adjustment of the mandrel. The mandrel mount has opposite side supports sandwiching the mandrel and a motor mounted for raising and lowering the mandrel between the side supports. Raising and lowering is accomplished via a pair lead scre ws secured to the mandrel, each having a gear threadedly engaged thereon and which is driven b y the motor. The mandrel is also horizontally adjustable.
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