Brother International PR1050X Operation Manual - Page 126

Adjusting the Thread Tension of both the Bobbin and Upper Thread The following procedure describes how to adjust the thread tensions. After adjusting the tension of the bobbin thread, adjust the tension of the upper thread for each needle bar. Note • Be sure to check the tension of the bobbin thread each time that the bobbin is changed. Depending on the bobbin thread type and whether a prewound bobbin is used, the tension of the bobbin thread may differ. For example, when replacing an empty prewound bobbin with one of the same type, be sure to check the tension of the bobbin thread and adjust the tension if necessary. • Be sure to adjust the tension of the bobbin thread before adjusting the tension of the upper thread. Adjusting the tension of the bobbin thread As shown in the illustration, hold the b bobbin case against a smooth vertical surface. Tie the included weight to the end of the a thread extending from the bobbin case. Note • Different weights are used to adjust pre- wound bobbins and metal bobbins. Pre-wound bobbins: Only weight (L) Metal bobbins: Weight (L) and weight (S) * Weight (S) is included with the optional bobbin winder. • If the thread with the weight attached is slowly pulled out, the thread tension is correct. Use the included standard screwdriver to c turn the tension-adjusting screw and adjust the thread tension. 124 1 Tension-adjusting screw 2 Tighter 3 Looser