Brother LK3-B448E Adjusting the thread take-up amount, Adjusting the movable knife, Adjustments

10. Adjustments

10-6.Adjusting the thread take-up amount

q

Thread take-up amount (stroke)

e

Become less

Become greater

w

q

r

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

A

e w

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.

LK3-B448E MARKII/BA-16

39