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WEB FOLDING APPARATUS AND METHOD

  • US 3,841,620 A
  • Filed: 02/12/1971
  • Issued: 10/15/1974
  • Est. Priority Date: 02/12/1971
  • Status: Expired due to Term
First Claim
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1. In apparatus for longitudinally interfolding a plurality of webs and for advancing the interfolded webs in a continuously moving stack along a feed path, in combination:

  • a plurality of folding devices mounted in spaced relationship with each other along the feed path, each of said folding devices having an infeed surface and an outfeed surface extending from and continuous with said infeed surface in the direction of movement of the stack along the feed path, said outfeed surface including a pair of gradually curved diverging folding shoulders, at least one of said folding shoulders extending at an angle from a portion of the infeed surface adjacent the feed path obliquely across at least a portion of the feed path, and outfeed surface portions extending laterally from said folding shoulders defining a concave surface, as viewed from the preceding folding device, between the folding shoulders for concavely folding the portion of a web drawn therebetween, said folding devices being disposed along the feed path so that the concave outfeed surface portion of each folding device can receive the portion of the folded web from the preceding folding device to be interfolded with the web supplied to said folding device;

    means associated with each of said folding devices for guiding the portion of the folded web from the preceding folding device to be interfolded with the web supplied to said folding device into the concave outfeed surface portion of said folding device so that the folding shoulder which extends across the feed path is interposed between said portion of the folded web to be interfolded and the remainder of said folded web opposiTe said portion;

    means for supplying a web to each of the folding devices; and

    means for drawing the web supplied to each of the folding devices over the infeed and outfeed surfaces of said folding device and into the stack so that said web is folded concavely around the portion of the folded web from the preceding folding device guided into the concave outfeed surface portion of said folding device as said web passes the outfeed surface of said folding device and so that a portion of said web on the side of the fold adjacent the interposed folding shoulder is gradually interposed between the folded surfaces of the web from the preceding folding device by said interposed folding shoulder to interfold said web and the web from the preceding folding device, and a portion of the web on the other side of the fold is positioned by the other folding shoulder for guiding into the concave outfeed surface portion of the succeeding folding device.

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