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We have seen how a lap seam is formed and the parts that help to complete it. Now we need to also discuss two distinct methods of lap seaming, using what is referred to as flat lap seaming parts and stepped lap seaming parts. With flat lap seaming parts, the throat plate, presser foot and feed dogs have a flat contour from the left to right side, Figure 9. With stepped lap seaming parts the throat plate, presser foot and feed dogs each have a contour that is raised .050" (1.27mm) higher on the right side than the left side, Figure 10. For many manufacturers sewing medium to medium -heavy weight materials on a consistent day–to–day basis, the stepped lap seaming parts are generally used. This is because the stepped parts help to keep the material even when feeding through the machine. But for operations where a daily variety of weights and thicknesses of materials from light to heavy are sewn, then the flat lap seam parts are recommended. This is because the flat parts will accommodate a much larger variety of materials from light weight to heavy weight and yet still keep them even when feeding and sewing.
There is one final seaming operation |
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