1. Loosen the two set screws
to adjust the position (139.5mm) of the
bobbin winder driving wheel
and fix it with the two set screws
.
o If the distance of 139.5mm is
insufficient, rubber ring wear may
occur in the bobbin winder unit.
In addition, the bearing life may
be reduced in the bobbin winder
unit.
o If the distance of 139.5mm is ex-
cessive, normal thread winding
may fail. In addition, this will also
cause rubber ring slippage in the
bobbin winder unit and give rise
to wear.
1. Loosen the set screw
of the bobbin winder lever and adjust the
distance to 14mm between the bobbin winder lever
and the bob-
bin winder shaft
. After that, tighten the set screw
of the bobbin
winder lever.
2. Start the sewing machine and wind the thread at the bobbin winder.
Confirm the amount of winding.
1) If the amount of winding seems to be too much, adjust the bobbin
winder lever
in the direction of the arrow
B
.
2) If the amount of winding seems to be too less, adjust the bobbin
winder lever
in the direction of the arrow
A
.
3. If the winding state of the thread
around the bobbin winder
seems to be uneven, loosen the nut
and adjust the height of the
thread tension control
.
(Example) If the amount of the wound thread is less on the upper
side of the bobbin winder
as illustrated, adjust the
thread tension control
upwards.
o If too much thread is wound
(thread protruded from the bobbin
winder
), the thread
will
come in contact with the inside of
the bobbin case and this can be
a cause of sewing deficiency.
o If the amount of thread winding is
uneven at top and bottom of the
bobbin winder
, stitch perfora-
tion may become irregular.
– 56 –
Adjustment Procedures
Results of Improper Adjustment
Adjustment Procedures
Results of Improper Adjustment
