Brother International BAS-341F Instruction Manual - English - Page 20
Lower thread tension, 5-6-4. Thread take-up spring height
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5. CORRECT USE 5-6-2. Lower thread tension 5-6-3. Upper thread tension Weaker (1) Stronger Stronger Weaker 0112S 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 Stronger Weaker 1937S 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 35 - 40 mm. 5-6-5. Thread take-up spring tension Lower Higher Stronger 1938S Loosen screw (4) and turn the entire thread take-up unit to adjust so that the height of the thread take-up spring is 8 10 mm Weaker 1939S Adjust the thread take-up spring tension by turning the tension stud (5) with a screwdriver. BAS-341F, 342F 13