Pfaff 72 Owner's Manual - Page 16

Regulating the Thread Tension The bobbin thread tension has been set for a medium grade and need not be adjusted for all ordinary sewing operations. If a special sewing operation should require a looser or tighter tension, turn the small knurled screw on the bobbin case with the tip of your thumb as follows: Turn it left W'\ for looser tension. Turn it right for tighter tension. Determine whether the bobbin thread tension is set for a medium grade by holding the thread end between thumb and forefinger and letting the bobbin case hang freely. The tension should be strong enough to keep the bobbin case from being pulled down by its own weight. However, as you jerk your hand slightly, the bobbin case should gradually slide down. Do not turn the knurled screw too far to the left to keep it from falling out. Choose the lower tension slightly stronger when doing ornamental stitching to be sure you always have a nead satin stitch on the right side of the fabric. V DR 580 A The final stitch appearance can be regulated by the upper tension dial, as follows: Turn left y for looser tension. Turn right for tighter tension. The upper tension is so designed that all grades of tension - loose to tight - can be covered with one complete turn of the tension dial. The numbers on the tension dial indicate different degrees of tension. The higher the number, the greater the tension. Oniy in very rare cases will it be necessary to reset the ten sion. For ordinary sewing, the upper tension should be set between 3 and 5. Your upper tension has a third tension disc for twoneedle work. I R8029 17