Pfaff 132 Owner's Manual - Page 8

__ Regulating the Thread Tensions - Figs. 9-li The Upper Thread Tension is regulated by turning the setting flange of upper thread tensioner a (Fig. 6). - Clockwise turning increases the tension; anticlockwise turning loosens the tension. The U n d e r T h r e a d T e n s I o n is regulated by turn ing the small screw a (Fig. 4) with a screwdriver. Here too the tension is increased by clockwise adjustment and decreased by anti-clockwise adjustment. It is generally only necessary to adjust the upper thread tension. Satisfactory stitching is possible only if upper and under thread tensions are correctly set. After you have sewn an inch or two, inspect the stitching on top and underneath. The tensions are satisfactory if both threads are drawn into the material e q u a II y and lock in the center of the work (see Fig. 9). If, however, loops have formed on the underside, the upper thread is too slack and must be given more tension by turning the setting flange a (Fig. 6) to the right (Fig. 10). If loops continue to be formed on the u n d e r s i d e of the work, it is possible that the under thread has been tensioned too severely and this must be corrected by turning the small screw a (Fig. 4) a little to the left. If, on the other hand, the thread is lying fIat o n to p of h e m a t e r i a I (Fig. ii), or if loops hove formed, the upper thread may be too tight and you must loosen the 12 tension by turn ing the flange a - Fig. 6 - to the left. If this adjustment does not improve the stitch forming, the under thread must then re ceive more ten sion by turning the screw a - Fig. 4 - to the right. b -J F;g. 9 Fg. 10 Fig. 11 Regulating the Presser Foot The presser foot must exert on the material sufficient pressure to ensure satisfactory feeding of the material. The presser bar is set for oIl regular sewing work on light and medium weight goods. Heavy or hard texture materials require more pressure. To increase the pressure, turn the setting screw to the right; to decrease the pressure, turn the screw to the left, I. e. upwards. Removing the Work from the Machine Raise the take-up lever to its highest and lift the presser foot. Draw the work to the back of the machine, away from the needle. The ends of the thread should be cut approx. 3' from the needle and be placed under the foot to the back, thus leaving the machine ready for the next run. 13