JUKI MO-6700D Series Manual page 61

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.
(Refer to the Instruction Manual)
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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