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| 4. PREPARATION BEFORE SEWING | |
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| [Thread tension reference] |
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| Specifications |
| Seatbelt | |||||
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| Upper thread |
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| #50 or similar | #20 or similar | #4 or similar | ||
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| Lower thread |
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| #50 or similar | #20 or similar | #4 or similar | ||
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| Upper thread tension (N) |
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| 0.8 − 1.2 | 1.4 − 1.8 | 1.2 − 2.0 | ||
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| Lower thread tension (N) |
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| 0.2 − 0.3 | 1.0 − 1.5 | |||
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| 0.1 − 0.3 | 0.1 − 0.6 | 0.3 − 0.6 | |||
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| Needle |
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| DP x 5 #16 | DP x 17 #19 | DP x 17 #25 | ||
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| Normal sewing speed |
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| 2,000 sti/min | 2,000 sti/min | 1,300 sti/min | ||
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| Adjust the thread tension to the weakest possible tension by | |
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| turning the thread tension nut (1) until the bobbin case will | |
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| not drop by its own weight while the thread end coming out | |
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| of the bobbin case is held. |
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| Stronger |
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| Weaker |
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2536Q
4-5-2. Upper thread tension
1. Turn the tension nut (1) (main tension) to adjust the tension as appropriate for the material being sewn.
2. Use the tension nut (2)
Stronger
Weaker
Stronger
Weaker
3067B
26 |