JUKI MO-6000S series Engineer's Manual page 89

Trouble
16. Uneven double chain stitches
17. The looper thread bulges out
18. Looper thread bite
19. Knotting position is not correct.
Right side
Knots are deflected to
the upper looper side.
Case (1)
Thread tension
Presser foot
Knife width
Looper thread take-up adjustment
Knife width
Adjustment of the looper thread take-up
Threading
Adjustment of the looper thread take-up
Case(2)
The looper thread tension is not enough.
The presser foot comes into contact with the throat plate
unevenly.
The presser foot pressure is not enough.
The knife width is too small for the overedging width.
The looper thread take-up draws out excessive looper
thread.
The knife width is too large for the overedging width.
The looper thread take-up draws out insufficient amount
of looper thread.
Re-threading after thread breakage,etc. has been done
erroneously.
The height of the looper thread take-up (left) is not
correct.
The upper looper thread guide (right) is too short.
Check and Corrective measures
Slightly increase the tension.
Make the presser foot come into contact with the throat
plate evenly.
Increase the presser foot pressure.
Use a knife having width suited to the overedging width.
Decrease the radius of the looper thread take-up (left)
(reduction in dimension I). Raise the looper thread take-
up (right) (increase in distance O).
Use a knife having width suited to the overedging width.
Increase the radius of the looper thread take-up (left)
(increase dimension I). Lower the looper thread take-up
(right) (reduction in distance O).
See the threading diagram.
Raise the looper thread take-up (left) to increase the
amount of upper looper thread, and the knotting position
moves toward the lower looper side.
Increase distance K.
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