Operation Manual

30
Sewing
3. Adjusting thread tension
Before adjustment, check again that "P.16 [Threading the upper thread]" has been performed correctly.
侀
Adjustment method for upper thread tension
侀
Upper thread is tight Upper thread is loose
Turn down the upper thread
tension dial.
Turn up the upper thread
tension dial.
Note : If the tension does not change even when you turn the upper
thread tension dial, reset the upper thread.
Note : If it does not change with the upper thread, adjust the lower
thread.
侀
Adjustment method for lower thread tension
侀
Adjust by turning
the bobbin case
adjustment screw with
the accessory screw
driver.
Turn right to tighten
the tension
Turn left to loosen the
tension
After adjusting the tension of
the bobbin case, suspend
bobbin, bobbin case, and
shuttle hook all together and
hold the bobbin thread as
illustrated.
(Please refer to P.46)
Note:
When the bobbin case tension is
correct: the thread should slide
down with light resistance.
When the bobbin case tension is
too tight: the thread does not
slide down, or the thread jerks.
When the bobbin case tension is
too loose,: the thread easily
slides down with no resistance.