Adjusting The Thread Take-Up Amount; Adjusting The Movable Knife - Brother LK3-B438E MKII Instruction Manual

10-6.Adjusting the thread take-up amount

Thread take-up amount (stroke)
q
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.

10-7 . Adjusting the movable knife

q
B
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.
q
A
LK3-B438E Mark II
10 . STANDARD ADJUSTMENTS
e
Become less
Become greater
w
w
e
r
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