JUKI MH-481 Serie Manual De Instrucciones página 67

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Troubles
5 Set position of the frame thread eyelet
is not suitable.
6 Position of the thread take-up lever is
not suitable.
7 Throat plate does not fi t.
4. Needle breakage 1 Needle is bent.
2 The timing of the needle motion with
that of needle is not correct.
3 Position of the presser foot is wrong.
4 Motion of the needle guard is not ad-
equate.
5 The tension of needle thread is too
high.
6 Thickness of the needle is not suitable.
5. Puckering
1 Thread tension is too high.
2 Timing of the looper thread take-up is
wrong.
3 Thread paths are not smooth.
4 Pressing force of the presser foot is too
much
5 Needle
6 Throat plate.
6. Puckering
1 Presser foot
2 Pressure of presser foot
Causes
– 48 –
Corrective measures
Try to lower the position.
Refer to "25. POSITION OF THE FRAME
THREAD EYELET".
Try to push it up.
Refer to "24. POSITION OF THE THREAD
TAKE-UP LEVER".
Replace it with other throat plate which has
larger needle hole.
Replace it with a straight needle.
Refer to "6. ATTACHING THE NEEDLE".
Adjust the timing.
Refer to "17. ADJUSTING THE FEED TIM-
ING".
See if the hole of presser foot, hole of throat
plate and loop guide plate are placed in the
center of needle.
Check the position and timing of the motion of
the needle guard.
Refer to "22. MATCHING THE MOTION OF
THE NEEDLE GUARDS WITH THE LOOP
GUIDE".
Loosen the tension.
Refer to "9. THREAD TENSION".
Replace it with a suitable needle in accordance
with the quality and weight of the sewing ma-
terial.
Refer to "6. ATTACHING THE NEEDLE".
Reduce the thread tension, especially the
looper thread.
Refer to "9. THREAD TENSION".
Set the timing to a little earlier.
Refer to "23. POSITIONING THE LOOPER
THREAD TAKE-UP".
Polish the thread path with lapping agent on
thick thread #8.
Tighten the adjusting screw.
Refer to "12. ADJUSTING THE PRESSER
FOOT".
Use a fi ner needle.
Use a throat plate designed for fi ne materials.
Ratio of differential feed; Apply 1:0.7 ratio for
gathering.
Use a sliding type presser foot.
Refer to "12. ADJUSTING THE PRESSER
FOOT".
Reduce the pressure.
Refer to "12. ADJUSTING THE PRESSER
FOOT".

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Mh-484 serieMh-481Mh-481-4Mh-481-5Mh-484Mh-484-4 ... Mostrar todo

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