JUKI MF-7900 Series Engineer's Manual page 19
High-speed, cylinder-bed top and bottom coverstitch machine
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Also See for MF-7900 Series:
- Instruction manual (30 pages) ,
- Specification (8 pages) ,
- Quick start manual (2 pages)
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Adjustment procedures
1.
When motion of thread is very rough, and stable seams can
not be obtained, there are cases where the condition can be
improved by the following threading.
(1) Wind thread around 1st thread guide ❺ .
2.
When using more stretchable thread (wooly thread or the like),
the threading as given below does not make thread stretch and
neat seams can be obtained.
(1) Do not pass thread through spreader auxiliary thread ten-
sion ❹ .
Refer to section E.
(2) Do not pass thread through the looper thread tension disk.
(F)
(3) Do not pass thread through the looper thread small tension
disk ❻ .
❺
❻
– 5 –
Results of Improper adjustment
◦ When threading is not proper-
ly performed, not only sewing
trouble occurs, but also needle
breakage is caused. So, be
careful.
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