–
22
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Standard Adjustment
Results of lmproper Adjustment
1. Loosen setscrew
2
in the looper holder and move looper holder
3
to the right and left to adjust.
2. After the adjustment, tighten setscrew
2
in the looper holder.
(Caution)
When adjusting looper holder
3
, adjust the lateral
position while being careful that the holder does not move
to and fro.
3. Longitudinal position
Adjust so that the clearance provided between blade point
5
of
looper and middle needle
4
is 0 to 0.05 mm when the top end of
looper comes to the center of middle needle from the extreme right
position.
After the adjustment, fix the looper holder with setscrew
2
in the
looper holder.
*
Blade point
5
of the looper comes in contact with the right needle
when rear needle guard
6
fails to work. So, be careful.
™
When the returning amount is large,
loop of needle thread becomes large
and it is apt to fall. As a result, stitch
skipping or thread breakage will be
caused, and stitch skipping on the
back is apt to occur.
In addition, thread tangling will be
caused.
™
When the returning amount is small,
loop of needle thread is small and
stitch skipping or thread breakage will
be caused.
In addition, thread tangling will be
caused.
2
1
3
6