JUKI MO-6000G Series Engineer's Manual page 88

I
00
(I,)
I
Trouble
13. Ovorlocklng needle thread Is loose.
14. Double chain stitch needle thread Is loose.
15. Uneven overlocklng stitches
The knotting poshlon of the upper and lower
looper threads varies as shown below.
Case
(1)
Position of the needle thread take,.up guide and
naedla thread guide
Thread tension
Needle
Thread tension
Thread cam
Needle
Double•chaln stitch needle thread take-up guide
Looper thread tension
LOoper thread take-up
Knifewidlh
Thread
path
Presser fool
Thread stand
Case(2)
They are positioned 100 high, and the thread take-up
draws out excessive needle thread.
.. The thread tension balarce has been dlsturt:>ed.
The needle is too thin tor the lhread used.
The looper thread tension is too high, and the needle
thread tension Is too low.
The thread cam draws out an insuflicient amount of
thread.
The thread cam timing Is bad.
The needle
Is
too thin tor the thread used.
Drawing amount of the needle thread Is Insufficient.
The upper end lower looper thread tensions are not
enough.
The looper thread take-up (left) is too high.
The knife wld1h
Is
unsuited for the overedging width.
Scratches
on
the thread path
catch
thread.
The presser fool cones into contact unevenly with lhe
throat plate and teed dogs and tends to meander.
Thread dose not come out smoothly.
Check and Corrective measures
Refer to the pertinent Standard Adjustment.
Refer to the Standard Adjustment for the looper thread
take-up components, and Increase the tension If
necessary.
Replace II With a proper one.
Reduce the looper thread tension
to
a minimum, and
Increase the needle thread tension.
Refer to the relevant Standard Adjustment.
Refer to the relevant Standard Adjustment.
Replace the needle with a proper one.
Refer to the relevant Standard Adjustment.
Slighrly Increase the upper al\d lower looper thread
tensions.
Slightly lower the looper thread take-up (left)
Make the overedging width slightly smalls r than that given
for the knife width.
Check the thread path for scratches.
Make the presser foot come Into coniaa with them evently.
Make the thread come out smoothly.
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