Pfaff 261 Owner's Manual - Page 21

R 8004 Correct Tension Regulation Balanced tensions are essential for sewing. If your tension is correct, you will have perfect seams as sketched below (Ill). Sketch I - The threads interlock on the underside of the fabric. Ca use: Upper tension too loose or lower tension too tight. Sketch II - The threads interlock on the surface of the fabric. Ca use: Upper tension too tight or lower tension too loose. A To check whether the tensions ore correctly balanc ed, take a closely woven piece of fabric and sew a few stroighi and zigzag seams. If the straight stitches are tightly drawn in on both sides of the fabric (see seam sketch Ill), the tensions are cor rect. The surest way to double-check this is by ex amining a zigzag seam, If the zigzag seam is equally wide on surface and underside of the fabric, that is if the threads are locked exactly at the zigs ond zags of the seam, the tension adlust ment is correct. 20