5-6-2. Lower thread tension; 5-6-3. Upper thread tension; 5-6-4. Thread take-up spring height- Page 20

5. CORRECT USE

BAS-341F, 342F

13

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 8 -
10 mm

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 35 - 40 mm.

Stronger

Weaker

1938S

1939S

Stronger

Weaker

Higher

Lower

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

0112S

(1)

1937S

Stronger

Weaker

Weaker

Stronger