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7.Bobbin thread tension adjustment( Fig.13)
The lower-thread tension should be set in accordance with the type of seam required. Adjust the tension
with screw 1. (Fig.13)
8.Needle thread tension adjustment
The needle thread tension can be adjusted by changing pressure of the tension disk, and force and stroke of
the thread take-up spring.
1） Tension disk pressure adjustment (Fig.14)
(1) In most cases, thread tension can by properly adjusted only by changing tightness of the tension
regulator thumb nut.
(2) To increase pressure, turn the nut clockwise.
(3) To decrease pressure, turn the nut counter-clockwise.
2） Thread take-up spring force/stroke adjustment（Fig.15）
Apply a screwdriver to the thread take-up spring stud and turn the stud. Spring force increases when the
screwdriver is turned counter-clockwise, and decreases when turned clockwise. If the stud is tight, remove the
face plate and loosen the screw of tension regulator slightly.
3） Thread take-up spring force/stroke adjustment（Fig.15）
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