JUKI IP-100A Engineer's Manual page 31

Adjustment Procedures
1) Loosen screw 1 and adjust the position of bobbin case stopper
2 by turning the entire unit of the bobbin case stopper.
(Caution) After the position of bobbin case stopper 2 has
been adjusted, turn the bobbin case by fingers in the
reverse direction of rotation to confirm that the bobbin case
will never slip out of the small claw of bobbin case stopper
2.
Adjustment Procedures
1) Loosen needle bar thread holder screw 1, and adjust the
position of needle bar thread holder 2 with respect to the
needle bar.
2) Loosen the screw in the needle bar connection, and adjust the
entire unit of the needle bar and needle bar thread holder.
Results of Improper Adjustment
Results of Improper Adjustment
™ If the orientation of the needle
bar thread holder is not properly
adjusted, the thread is likely to
untwist resulting in thread
breakage.
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