17
5.6) Upper Thread Tension Adjustment
Sewing Type
Cause
Corrective Action
Evenly created good stitch
If the upper thread tension is too weak or the
lower thread tension is too strong
If the upper thread tension is too strong or the
lower thread tension is too weak
Strengthen the upper thread tension or weaken
the lower thread tension.
Weaken the upper thread tension or strengthen
the lower thread tension.
5.6.1) Lower Thread Tension
Adjust the lower thread tension by adjusting the tension
adjusting screw
①
to the extent that the bobbin case
slowly drops due to its own weight when the thread tip is
held as in the figure.
①
5.6.2) Upper Thread Tension
A. Adjust the lower thread tension and then the upper
thread tension to produce evenly created good
stitches.
B. Pull down the presser bar.
C. Turn the tension adjusting nut
②
of the main thread
adjusting device for adjustment.
②
Stronger
Weaker
[Fig. 16]
[Fig. 17]
Stronger
Weaker
Turn off the power switch when inserting or removing the bobbin case. If the pedal is mistakenly
stepped, it may operate the sewing machine, causing injury to user.
Caution