Uneven material edges and smoothness
To obtain precise flat edges when sewing elasticated materials, the front toothed rack feeders must push forward faster than the rear ones, so that the material is not stretched. For smoothness the front toothed rack feeders must also work faster than the rear ones. With a larger stitching length the material stays easily smooth. Place the differential feed motion at "G".
Avoid ruffles by stretching
To avoid seams casting wrinkles in very light materials or fine nylons, the rear toothed rack feeders must work faster than the front ones. Thereby the front toothed rack feeders hold the material taut so that it does not ruffle. Place the differential feed motion at "S".
- 19 -
