Brother LK3-B438E Instruction Manual download pdf (Page 38)

LK3-B438E Mark II

10-6.Adjusting the thread take-up amount

10-7 . Adjusting the movable knife

10 . STANDARD ADJUSTMENTS

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.

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Brother LK3-B438E Instruction Manual Page 38