JUKI MO-6700D Series Manual page 11

Adjustment Procedure
1) Loosen setscrew
the clearance provided between the right-hand side needle and the
lower looper (for 2-needle overlock machine) and the clearance
provided between the needle hole in the throat plate and the needle
(for safety stitch machine).
Adjustment Procedure
1) Loosen setscrew
frame.
Since it is difficult to accurately measure the center-to-center distance,
perform adjustment to provide a 3.5 mm distance between the end
surface of the arm and the neck of the ball as illustrated.
and adjust, by slightly turning needle clamp
of the lower looper holder from the rear of the
Results of Improper Adjustment
,
Results of Improper Adjustment
– 7 –
o I f t h e c l e a r a n c e p r o v i d e d
between the needle and the
looper is excessive, the needle
thread will be likely to skip at the
time of tucking.
o I f t h e c l e a r a n c e p r o v i d e d
between the needle and the
looper is insufficient, the needle
will break or the looper blade
point will be damaged causing
thread breakage.
o Increasing the center-to-center
distance will give a smaller stroke
of the double chain looper or
lower looper, and decreasing the
distance will give larger stroke.