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1) Loosen setscrew and adjust, by slightly turning needle clamp ,
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).
o If the clearance provided
between the needle and the
looper is excessive, the needle
thread will be likely to skip at the
time of tucking.
o If the clearance provided
between the needle and the
looper is insufficient, the needle
will break or the looper blade
point will be damaged causing
thread breakage.
1) Loosen setscrew of the lower looper holder from the rear of the
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.
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.
Adjustment Procedure Results of Improper Adjustment
Adjustment Procedure Results of Improper Adjustment
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