Brother BAS-311F-0, BAS-326F-0, BAS-311F-L instruction manual Lower thread tension

5. CORRECT OPERATION

5-6-2. Lower thread tension

Weaker

Stronger

(1)

0112S

Set the lower thread tension to as weak a tension as possible and so that the bobbin case drops by its own weight when the end of the thread is held. Turn the adjusting screw (1) to adjust the tension.

Note

If the lower thread tension is too weak, it may not be possible to cut the lower thread properly during thread trimming.

5-6-4. Thread take-up spring height

Lower

Higher

A mm

(4)

1204S

Loosen screw (4) and turn the entire thread take-up unit to adjust so that the height of the thread take –up spring is A mm. (Refer to “5-6-1. Sewing conditions”)

5-6-6. Adjusting arm thread guide R

Become greater Become less

(2) (1)

1206S

5-6-3. Upper thread tension

Stronger

Weaker

(3)

(2)

Stronger

Weaker

1203S

Turn the tension nut (2) (main tension) to adjust the tension as appropriate for the material being sewn.

Furthermore, turn the thread nut (3) (sub-tension) to adjust the remaining length of upper thread to approximately 40 mm.

5-6-5. Thread take-up spring tension

(5)

Stronger

Weaker

1205S

Adjust the thread take-up spring tension by turning the tension stud (5) with a screwdriver.

The standard position of arm thread guide R (1) is the position where the screw (2) is in the center of the adjustable range for arm thread guide R (1).

To adjust the position, loosen the screw (2) and then move arm thread guide R (1).

When sewing thick material, move arm thread guide R (1) to the left. (The thread take-up amount will become greater.) When sewing thin material, move arm thread guide R (1) to the right. (The thread take-up amount will become less.)

BAS-311F-0, 311F-L, 326F-0

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