Thread Take-Up Spring Tension - Brother T-8421C Instruction Manual

Twin needle direct drive lock stitcher
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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
Stronger
Weaker
Weaker
Stronger
3017M
T-8421C, 8422C, 8452C, 8722C, 8752C
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)
< 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).
13. STANDARD ADJUSTMENT
0.25N
0.34N
0.70N
66

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This manual is also suitable for:

T-8422cT-8752cT-8452cT-8722c

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