| 摘要 |
A method of needling a web of fibrous material in which the web is advanced along a feed path relative to an array of needles which repeatedly penetrate the web. The relative longitudinal feed movement which takes place between penetrations by the needle array is varied so that preferably each successive feed step differs in magnitude from the preceding one. One embodiment of apparatus for performing the method includes feed means for advancing the web along the feed path and incorporating a transmission mechanism including a dimensionally variable component, variation of the dimension of said component varying the magnitude of the feed step of the web between successive penetrations. A further embodiment of the apparatus includes a transmission mechanism incorporating a differential gear to convert a continuous uniform rotation into a continuous non-uniform rotation.
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