8
Threading of bobbin threads
( 1 ) Extend the bobbin thread above the bed.
( 2 ) While holding two needle threads with your left
hand, turn the pulley one rotation with your
right hand. The bobbin threads will come up
when needle threads are lifted up as shown in
the figure. Needle threads and bobbin threads
should be aligned and led backward together.
9
Adjustment of bobbin threads tension
:
Adjustment of needle threads tension
Adjust needle threads tension by turning thread
tension nuts.
A
Adjustment of the thread take up spring
1 . Adjusting movable range of the thread take up spring
( 1 ) To adjust the thread take up spring ①
for the left thread, loosen the stopper stop
screw ② and move the stopper ③.
( 2 ) To adjust the thread take up spring ④ for
the right thread, loosen the stopper stop
screw ⑤ and move the stopper ⑥.
2 . Adjusting intensity of the thread take up spring
( 1 ) Left thread:
Loosen the lock nut ⑦, and remove the face plate.
Loosen the screw ⑪ in the arm.
Turn the adjusting shaft ⑧.
After adjustment, tighten the screw ⑪, and
tighten the lock nut ⑦.
( 2 ) Right thread:
Loosen the screw⑨, and turn the adjusting nut⑩.
After adjustment, tighten the screw ⑨.
HOW TO USE
Pre-tension nut
Tighten
Loosen
Tighten
Loosen
Thread tension nut
Decrease
Increase
⑤
②
③
⑥
⑨-Right side
⑧-Left side
⑦-Left side
④
⑪
①
⑩-Right side
Tighten
Loosen
Thread
Thread
Opener
Loosen
Tighten
Thread tension screw
— 8 —
Summary of Contents for LT2-2250-B1T
Page 28: ...Printed in Japan ...
