JUKI MO-6800D/DD20 Series, Instruction Manual, Page: 31 / 77

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❺
❹
❹
❺
A
❶
❷
❸
(3) The relationship between the upper looper and the lower looper
0.05 to 0.2 mm
When the upper and the lower loopers cross, keep
them as close as possible.
Somehow, the loopers shall not either touch nor col-
lide to each other. The clearance of 0.05 to 0.2 mm
should be provided between the upper and lower
loopers when they are crossing.
(4) The relationship between the needle and the double chainstitch looper
When the double chainstitch looper moves to reach
its leftmost position, the distance from the double
chainstitch looper to the center line of the needle
should be 1.4 to 1.9 mm (50H, 60H: 1.6 to 2.3 mm).
(5) The relationship between the needle and the needle guard
0.1 to 0.2 mm
Light contact
1.4 to 1.9 mm
Adjust so that the clearance of 0 ± 0.05 mm is pro -
vided between crest A of the lower end of scarf of
double chainstitch needle ❹ and double chainstitch
looper ❺ .
At this time, the tip of double chainstitch looper ❺
should be located inside the side face of double
chainstitch needle ❹ .
0 ± 0.05 mm
Adjust so that movable needle guard ❷ comes in
light contact with the needle when overlock needle
❶ (left needle for the 2-needle model) is brought to
its lower end position.
Adjust so that the distance from needle ❶ to front
needle guard
❸
to 0.1 to 0.2 mm.
Tip has to be
located inside
the side face
of needle.