Thread Tension Adjustment - Toyota SL1A Manual

5. Thread Tension Adjustment

Adjust thread tension to suit the type of material
and the size of thread used. As the number on
the thread tension dial increases, the thread
tension becomes tighter.
Tension Guide
Adjust thread tensions using the guide as below.
Test sew on scrap of fabric. Adjust finely to
perfect seam.
Correct tension
Lower looper thread and upper thread should
be well balanced with same tension. (Both looper
threads should make cross at the edge of the
fabric.)
Needle thread should not be loose or tight,
but of average tension.
When the upper looper thread is unbalanced and lies on the under side of fabric
Tighten the thread tension of the upper looper
(Dial B) or loosen the thread tension of the
lower looper (Dial R).
FOUR THREAD OVEREDGING STITCH USING 2 NEEDLES
1 -17
Light Weight
Dial Fabric
(Chiffon, etc) (Wool, Jersey)
Y 2.5 3
G 2 3
B 2.5 4
R 0 2
Wrong side
Right side
Wrong side
Right side
Medium Heavy
(Denim, etc)
4 6 5 7
3 5 5 7
4 5 5 7
3 4 2.5 3.5
Lower looper thread
Right-hand needle
thread
Upper looper thread
Left-hand needle
thread
Lower looper thread
Right-hand needle
thread
Upper looper thread
Left-hand needle
thread