Apparatus for folding an edge on a continuous material web

Apparatus for folding an edge of a continuous material web, said apparatus comprising:

• means for guiding a continuous material web along a substantially planar path, said web having a lateral edge;
• a plurality of wheels mounted for rotation adjacent the edge of said path;
• an endless belt mounted on said wheels and said belt having a planar face;
• means for advancing said belt at substantially the same speed as the material web;
• said wheels being positioned for guiding said belt along first, second, third, and fourth segments in sequence;
• said first belt segment extending along said edge path with said belt face aligned with said web planar path and turning said belt face in a first rotational direction through 180.degree.;
• said second belt segment extending in spaced relation to the edge of said web and advancing in a direction opposite to said first segment;
• said third belt segment extending, in a spaced relation, along said edge path, said belt face turning in the rotational direction opposite to the first rotational direction;
• said fourth segment extending in a spaced relation to the edge of said web and advancing in a direction opposite to said first segment and turning said belt face in a rotational direction opposite to the first rotational direction;
• the belt being turned, in the second, third, and fourth segments, in the rotational direction opposite to the first rotational direction through 180 .degree.;
• whereby the planar face of the belt turns the edge of the continuous web through 180.degree. as the web and belt advance together.