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WEB FOLDING APPARATUS

  • US 3,834,689 A
  • Filed: 04/07/1972
  • Issued: 09/10/1974
  • Est. Priority Date: 04/07/1972
  • Status: Expired due to Term
First Claim
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1. In apparatus for forming longitudinal folds in each of a plurality of webs and for advancing the webs in a continuously moving stack, in combination;

  • a series of folding elements, one for each of said webs, positioned along the path of said stack in spaced relationship with each other, each of the folding elements including an infeed portion having an infeed surface and a substantially flat outfeed portion having first and second outfeed surfaces on opposite sides of said outfeed portion, said first outfeed surface forming an oblique angle with the infeed surface, said infeed surface having an initial portion at least as wide as the web being fed to said folding element, said outfeed portion being substantially narrower than the initial portion of said infeed surface and substantially narrower than the web fed to the folding element, and the remaining portion of said infeed surface being tapered from the width of said initial portion to the width of said outfeed portion;

    means affixed to the infeed portion of each of the folding elements for supporting the same adjacent said stack;

    means for respectively drawing said webs over the infeed and first outfeed surfaces of the folding elements and into the stack so that substantially the entire width of the web is supported as it passes the initial portion of the infeed surface and, as the web passes the tapered portion of the infeed surface, separate longitudinal portions of the web adjacent the edges thereof become unsupported by the infeed surface and form surfaces in the interior of the oblique angle defined by the planes of said infeed and first outfeed surfaces;

    a pair of folding fingers of substantially rectangular crosssection overlying the outfeed portion of each of the folding elements, said folding fingers having inwardly directed folding surfaces which converge in the direction of movement of said stack in position to engage the separate unsupported longitudinal edge portions of the corresponding web to turn said longitudinal portions over the outfeed portion and onto said second outfeed surface to form a fold of C-shaped crosssection; and

    an integral mounting device affixed to the outfeed portion of each folding element for maintaining both of the folding fingers for the folding element in fixed relationship with each other and with said outfeed portion.

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