JUKI AMS-221EN Series Engineer's Manual page 69

Adjustment Procedures
1. Loosen the 2 setscrews
bobbin winder driving wheel
Adjustment Procedures
1. Loosen the setscrew
distance to 14mm between the bobbin winder lever
bin winder shaft . After that, tighten the setscrew
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
2) If the amount of winding seems to be too less, adjust the bobbin
winder lever in the direction of the arrow
3. If the winding state of the thread
seems to be uneven, loosen the nut
thread tension control
(Example) If the amount of the wound thread is less on the upper
side of the bobbin winder
thread tension control
to adjust the position (139.5mm) of the
and fix it with the 2 setscrews
of the bobbin winder lever and adjust the
B
A
around the bobbin winder
and adjust the height of the
.
as illustrated, adjust the
upwards.
o If the distance of 139.5mm is
.
o If the distance of 139.5mm is ex-
o If too much thread is wound
and the bob-
of the bobbin
o If the amount of thread winding is
.
.
– 65 –
Results of Improper Adjustment
insufficient, rubber ring wear may
occur in the bobbin winder unit.
In addition, the bearing life may
be reduced in the bobbin winder
unit.
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.
Results of Improper Adjustment
(thread protruded from the bobbin
winder ), the thread
come in contact with the inside of
the bobbin case and this can be
a cause of sewing deficiency.
uneven at top and bottom of the
bobbin winder , stitch perfora-
tion may become irregular.
will