Brother International BAS-705 Instruction Manual - English - Page 31

4. SEWING 4-5. Sewing conditions and thread tension 4-5-1. Sewing conditions Specifications Upper thread Lower thread Upper thread tension Lower thread tension Thread take-up spring height Thread take-up spring tension Pre-tension Needle Normal sewing speed Denim #20 or equivalent #30 or equivalent 120 - 220 g 20 - 30 g 6 - 10 mm 110 - 200 g 30 - 50 g DPʷ17NY #21 2100 spm #30 or equivalent #50 or equivalent 100 - 150 g 19 ˡ 4-5-2. Upper thread tension wWeaker Stronger Stronger Weaker q Weaker Stronger 4-5-3. Lower thread tension Stronger Weaker q To adjust the thread tension, turn the thread tension nut q (main tension) to adjust the tension in accordance with the material being sewn. In addition, turn the thread tension nut w (sub-tension) to adjust so that the trailing length of the upper thread is 35 - 40 mm. NOTEɾIf the upper thread tension is too weak, it will cause the thread to become tangled. If this happens, increase the upper thread tension.







ɾIf the upper thread tailing length is long (50 mm or more), synchronization errors may occur due to the thread becoming tangled at the sewing start. 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 q to adjust the tension. NOTE: If the lower thread tension is too weak, it may not be possible to cut the lower thread prop erly dur ing thread trimming. ʕ 28 ʕ B A S -705