Thread Tension
A2
A1
A3
A5
A4
A6
1. Wrong side of fabric
2. Right side of fabric
3. Right needle thread
4. Left needle thread
5. Upper looper thread
6. Lower looper thread
Thread tension is automatically set when selecting a stitch
but it may have to be fine tuned depending on:
• Type and thickness of the fabric
• Needle size
• Size, type and fiber content of the thread
See page 20 for how to adjust the thread tension settings.
The below describes how the tension settings can be adjusted
for 4–thread overlock stitch.
Correct Tension
Lower looper thread and upper looper thread should be well
balanced with the same tension (both looper threads should
cross at the edge of the fabrics). Needle threads should not
be too loose or too tight, but equally balanced tension.
Upper Looper Tension
B
A
When the upper looper thread is too loose (A):
Tighten the
thread tension of the upper looper or loosen the thread
tension of the lower looper.
When the upper looper thread is too tight (B):
Loosen the
thread tension of the upper looper or tighten the thread
tension of the lower looper.
Lower Looper Tension
D
C
When the lower looper thread is too loose (C):
Tighten the
thread tension of the lower looper or loosen the thread
tension of the upper looper.
When the lower looper thread is too tight (D):
Loosen the
thread tension of the lower looper or tighten the thread
tension of the upper looper.
Left Needle Tension
F
E
When the left needle thread is too loose (E):
Tighten the
thread tension of the left needle or loosen both looper
threads.
When the left needle thread is too tight (F):
Loosen the
thread tension of the left needle.
Right Needle Tension
H
G
When the right needle thread is too loose (G):
Tighten the
thread tension of the right needle.
When the right needle thread is too tight (H):
Loosen the
thread tension of the right needle.
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