JUKI TL-98Q - 8. Position of bobbin case positioning finger; 9. Momentum of thread take-up spring (absorbing amount of thread); 10. Tension of thread take-up spring

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8. Position of bobbin case positioning finger
™ Loosen bobbin case positioning finger 1 setscrew.
™ Make right-hand edge of convex portion of bobbin
case positioning finger spring align with 2 right-
hand edge of needle.
™ Temporarily tighten setscrew, hold clearance of 0.3
to 0.5 mm between inner hook and bobbin case
positioning finger, and securely tighten setscrew.
Bobbin case positioning finger should not come in
contact with hook.
Bobbin case positioning finger should not interfere
with hook.
9. Momentum of thread take-up spring (absorbing amount of thread)
™ Thread take-up spring has to be installed at position
of 10 ± 0.5 mm from thread guide as shown in the
figure below.
™ Perform adjustment with 1 thread take-up spring
adjusting plate.
10. Tension of thread take-up spring
™ Pass needle thread up to 1 thread tensioner thread guide.
™ Lower presser foot and draw needle thread.
™ Adjust tension of thread take-up spring to 0.176 to 0.245N when thread take-up spring starts lowering.
™ For adjustment, loosen thread tensioner setscrew and turn 3 thread tensioner.
™ Turning clockwise = increasing tension of 4 thread take-up spring.
Needle
Thread take-up spring
adjusting plate.
10 ± 0.5 mm
2 Thread tensioner
setscrew
1 Thread tensioner
thread guide
3 Thread tensioner
asm.
4 Thread take-up spring
Top view
Needle
3
0.3 to 0.5 mm
2
1
Front view
Needle thread
Bobbin case positioning
finger spring
Bobbin case positioning finger
Thread tensioner
thread guide
1 Thread take-up spring adjusting
plate and setscrew