| 摘要 |
A method and apparatus of forming folded hems about the periphery of openings in a moving fabric web include inserting a mandrel (102) having radially expandable and contractible folding means (104) into the openings to turn out of the web a peripheral portion of the fabric which is then folded back by radial expansion of the folding means (104). The folding means (104) is radially contracted for entry and withdrawal of the mandrel (102). The apparatus may comprise a rotating drum (82) within which a plurality of mandrels (102) mounted to orbit with the drum (82). The continuous web is carried by the drum (82) and positioning means (112,124,126,128) reciprocatingly insert and withdraw the mandrel (102) through the fabric openings. Control means (110,116,118, 120') radially expand and contract the folding means (104) synchronously with the positioning means (112,124,126, 128'). |
