Brother BAS-311F-L - Manual (Page 32)

5. CORRECT OPERATION
BAS-311F-0, 311F-L, 326F-0
25
5-6-2. Lower thread tension 5-6-3. Upper thread tension
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 5-6-5. Thread take-up spring tension
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
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.)
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.
Stronger
Weaker
1204S 1205S
(5)
Stronger
Weaker
Higher
Lower
Adjust the thread take-up spring tension by turning the
tension stud (5) with a screwdriver.
0112S
(1)
1203S
(2)
(3)
Stronger
Weaker
Stronger
Weaker
Weaker
(4)
1206S
Become greater Become less
A mm
(2) (1)