32
LK3-B438E Mark II
q
q
e
w
r
q
B
A
10-6.Adjusting the thread take-up amount
10-7 . Adjusting the movable knife
10 . STANDARD ADJUSTMENTS
e
w
Thread take-up amount (stroke)
Become less
Become greater
At the time of shipment from the factory, the thread take-up amount (stroke) of the thread take-up lever
q
is
set to the standard setting of 5 mm. You may need to adjust this setting depending on the sewing conditions
to prevent the thread from pulling out at the sewing start.
[Adjustment method]
Loosen the screw
w
and move the stopper (3.57 nut)
e
to adjust the operating angle of the thread take-up
solenoid
r
.
* To reduce the thread take-up amount, move the stopper
e
upward.
* To increase the thread take-up amount, move the stopper
e
downward.
NOTE:
Do not increase the stroke of the thread take-up lever any more than is necessary.
If the sub-thread tension is too high, the needle thread length may become too short and the thread may come out of
the needle. Furthermore, if the sub-thread tension is too weak, the needle thread length may become too long and the
underside of the article being sewn may become untidy.
Loosen the nut
w
and move the connecting rod lever
e
to the left or right to adjust so that the V section
A
is
aligned with the index bark
B
on the needle plate when the sewing machine in the stopped position and the
movable knife
q
is moved toward the index mark.
