Brother International T-8422C Instruction Manual - English - Page 75

Thread take-up spring tension

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13. STANDARD ADJUSTMENT 13-3. Thread take-up spring tension < Measurement method > Do not pass thread through thread take-up Upper limit position when measuring thread take-up amount The standard tensions for the thread take-up spring R (1) and thread take-up spring L (2) are as follows depending on sewing machine specifications. For foundation (-T[]F) For light-weight and medium-weight materials (-[][]3) For heavy-weight materials (-405,-407) 0.25N 0.34N 0.70N Stronger Weaker Weaker Stronger < Adjustment method > Thread take-up spring R (1) [for right thread] 1. Loosen the set screw (3), and turn the adjusting thumb (4) to adjust the tension. 2. Tighten the set screw (3). Thread take-up spring L (2) [for left thread] 1. Loosen the tension nut (5). 2. Use a small screwdriver to turn the tension stud (6) to adjust the tension. 3. Tighten the tension nut (5). 3017M T-8421C, 8422C, 8452C, 8722C, 8752C 66

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T-8421C, 8422C, 8452C, 8722C, 8752C
13. STANDARD ADJUSTMENT
66
13-3. Thread take-up spring tension
The standard tensions for the thread take-up spring R (1) and
thread take-up spring L (2) are as follows depending on
sewing machine specifications.
For foundation (-T[]F)
0.25N
For light-weight and medium-weight materials
(-[][]3)
0.34N
For heavy-weight materials (-405,-407)
0.70N
< Adjustment method >
Thread take-up spring R (1) [for right thread]
1. Loosen the set screw (3), and turn the adjusting thumb (4)
to adjust the tension.
2. Tighten the set screw (3).
Thread take-up spring L (2) [for left thread]
1. Loosen the tension nut (5).
2. Use a small screwdriver to turn the tension stud (6) to
adjust the tension.
3. Tighten the tension nut (5).
< Measurement method >
3017M
Do not pass thread through
thread take-up
Upper limit position when
measuring thread take-up
amount
Stronger
Weaker
Weaker
Stronger