Adjusting Loop Lift - JUKI MO-104D Service Manual

14. Adjusting loop lift

[Checking items]
1 Needle
2 Blade point of lower looper
3 Lower looper
4 Gauge needle (Cut the top end of needle for use. L = 32.3 mm)
* Check that the clearance between the needle 1 and the blade point
2 of lower looper is 0.01 to 0.1 mm E .
* Turn the handwheel and check that the blade point 2 of lower loop-
er meets with the left side of gauge needle 4 when the lower looper
3 goes and back.
* The difference between the vertical positions when the lower looper
goes and back shall be 0.2 mm or less.
[How to perform adjustment]
○ Loosen the setscrews C of the lower looper support arm D .
○ Move the lower looper support arm D back or forth to adjust the
clearance between the needle 1 and the blade point 2 of lower
looper.
○ Tighten the setscrews C .
○ Adjusting the lower looper cam timing.
• Loosen the setscrews A of the lower looper cam B .
• Check the position of the blade point 2 of lower looper and the
gauge needle 4 while turning the lower looper cam B . Change
the position of the cam little by little so that the left side of gauge
needle 4 can meet with the blade point 2 of lower looper on
both ways of going and back.
• Tighten the setscrews A .
Gauge needle
3
– 11 –
2
2
A
B
A
C D C
1
4