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Adjustment procedures
Results of Improper adjustment
2) Position of the counter knife base
1. Loosen setscrews
❶
(1-needle: 2 positions, 2-needle: 4 posi-
tions) of the counter knife base.
2. Move the counter knife base
❷
to the position as shown in the
gure.
For the longitudinal position, press the edge of counter knife
base
❷
against the step difference of the hook shaft base
❹
.
(For the LU-2818-7 and 2868-7, press the edge of counter
knife base
❷
against
A
surface side of the hook shaft base
❹
.)
For the lateral direction, adjust so that the distance from the
throat plate
❺
to the counter knife
❸
is 1.2 to 1.5 mm (C), then
tighten setscrews
❶
(1-needle: 2 positions, 2-needle: 4 posi-
tions) of the counter knife base.
(Caution) When the counter knife base
❷
is moved, re-adjust
the knife pressure.
When dimension C is larger :
o
Knife pressure is increased. As a
result, motor stop will be caused.
o
Setting/taking out bobbin cannot
be performed.
o
Counter knife base interferes
with the rear end of moving
knife. As a result, moving knife
and counter knife
❸
will be bro-
ken.
When dimension C is smaller :
o
Knife pressure is decreased. As
a result, thread trimming failure
occurs.
o
Moving knife interferes with the
hook stopping section. As a
result, thread trimming failure oc-
curs or moving knife is broken.
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