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Adjustment of respective parts
7.Thread tension
Upper thread tension
[Condition]
Upper thread tension dial: "5"
Thread: Cotton yarn # 60
[Diagnosis]
1. Pass the upper thread from the spool of
thread to the thread guide. Pull the thread
vertically and measure the tension (A) when
the value has stabilized .
(Using a measuring instrument) (Fig. 1)
[Standard]
A = 0.85 to 1.15 N (Fig. 1)
* Make adjustment if the diagnosis result fails to
meet the standard.
[Adjustment]
1. Remove the external panels and others to
see the adjusting section. (See:page.45)
2. Turn the upper thread tension dial, adjust the
upper thread tension.(Fig. 2)
Turn to deep side increases the tension.
Turn to front side decreases the tension.
* Repeat the adjustment till the standard is met.
Lower thread tension
[Condition]
Thread: Cotton yarn # 60
[Diagnosis]
1. After setting a bobbin in the bobbin case, pull
out the lower thread through the lower thread
guide. Measure the tension (A) when the
value has stabilized.
(Using a measuring instrument) (Fig. 3)
[Standard]
A = 0.3 to 0.4 N (Fig. 3)
* Make adjustment if the diagnosis result fails to
meet the standard.
[Adjustment]
1. Turn the bobbin case adjustment screw,
adjust the lower thread tension.(Fig. 4)
Right turn increases the tension.
Left turn decreases the tension.
* Repeat the adjustment till the standard is met.
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