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6-3. Thread tension
Attain a balance between the needle thread tension and bobbin thread tension.
(1) As shown in Figure, the optimum tension balance is yielded when the needle thread is interlocked
with the bobbin thread along the center line of the fabric layers.
○
Well balanced
tension
(2) Needle thread tension is adjusted based on the bobbin thread tension. Bobbin thread is adjusted
with the pressure of tension adjusting spring while the needle thread is adjusted with the pressure
of thread tension discs of thread tension regulator (lower), intensity of thread take-up spring, shift
distance of the spring and thread tension discs of thread tension regulator (upper).
6-4. Adjustment of the thread tension
6-4-1. Adjustment of the bobbin thread tension
(1) Insert the thread wound bobbin in the bobbin
case and pass the thread end A through the
thread slit B. Following explanation is based on
the case where the #0 Polyester thread is used.
(2) Pull the thread end A.
Standard tension ・・・ 2~2.5 N
Adjust the tension with which the thread is taken
out from the bobbin case, with the bobbin case
tension adjusting spring screw A.
Right turns ・・・ Intensified.
Left turns ・・・ Weakened.
6-4-2. Adjustment of the needle thread tension
(1) Adjustment of thread tension disc pressure
Adjust the intensity with the regulating nut of
thread tension regulator (lower) and that of
thread tension regulator (upper).
×
The needle thread is tight
or the bobbin thread is loose
Regulating
nut
Regulating
nut
- 13 -
×
The needle thread is loose
or the bobbin thread is tight
Tension adjusting spring
To weaken
To intensify
Screw A
Thread tension regulator
A
B
Bobbin case
Bobbin
(upper)
Thread tension
regulator
(lower)
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