－10－
6.
Adjustment of Sewing Machine
6-1 Looper Thread Tension
Align Mark① of Supporting Plate and thread holes of
Thread Eyelet② and ③.
That is the standard adjustment.
To increase take-up amount of looper thread, move
Looper Thread Eyelet forward after loosening screws of
Thread Eyelet② and ③, and to decrease move them
backward.
Note: Too much take-up amount of looper thread will
cause skip stitch.
When using wooly thread, move Thread Eyelet② and ③
all the way forward and don't pass the thread between
Supplementary Tension Discs④.
6-2 Needle Thread Tension
It is not so easy to make loop for some kind of thread.
This makes it difficult for Looper to catch the needle
thread, causing skip stitch.
In such a case, pass the needle thread through
Supplementary Tension Disc ⑤ as shown in the
illustration.
In case the formation of needle thread loop is unstable
when using stretchable thread like synthetic thread, use
Needle Thread Guide.
With Needle Bar at the lowest position, the center of
thread hole of Needle Bar Thread Eyelet⑥ should be
even with the surface of Needle Thread Guide⑦; and ⑥
and⑦ should be parallel with each other.
That is the standard condition.
The adjustment of the height and left/right position of
Needle Thread Guide⑦ is made by loosening Screw⑧
and moving Needle Thread Guide⑦ up and down; and
left and right.
②
③
①
①
④
⑤
⑥
⑦
⑧
