Brother International BAS-311F-L Instruction Manual - English - Page 32

5-6-2. Lower thread tension 5. CORRECT OPERATION 5-6-3. Upper thread tension Weaker (1) Stronger Stronger Weaker 0112S Stronger Weaker 3570Q Set the lower thread tension to as weak a tension as possible and so that the bobbin case drops by its own weight when the end of the thread is held. Turn the adjusting screw (1) to adjust the tension. Note If the lower thread tension is too weak, it may not be possible to cut the lower thread properly during thread trimming. 5-6-4. Thread take-up spring height Turn the tension nut (2) (main tension) to adjust the tension as appropriate for the material being sewn. Furthermore, turn the thread nut (3) (sub-tension) to adjust the remaining length of upper thread to approximately 40 mm. 5-6-5. Thread take-up spring tension Lower Higher Stronger 3571Q Weaker 3572Q Loosen screw (4) and turn the entire thread take-up unit to adjust so that the height of the thread take -up spring is A mm. (Refer to "5-6-1. Sewing conditions") 5-6-6. Adjusting arm thread guide R Become greater Become less Index mark 3573Q Adjust the thread take-up spring tension by turning the tension stud (5) with a screwdriver. The standard position of arm thread guide R (1) is when the screw (2) is aligned with the index mark. To adjust the position, loosen the screw (2) and then move arm thread guide R (1). When sewing thick material, move arm thread guide R (1) to the left. (The thread take-up amount will become greater.) When sewing thin material, move arm thread guide R (1) to the right. (The thread take-up amount will become less.) BAS-311F-0, 311F-L, 326F-0 25