7. STANDARD ADJUSTMENTS
37
BAS-341H, BAS-342H
7-2. Thread take-up spring
Thread take-up spring height
(mm)
7 - 10
Thread take-up spring tension
(N)
0.6 - 1.2
<
Thread take-up spring height
>
Loosen the set screw (1) and turn the adjuster to adjust.
<
Thread take-up spring tension
>
1.
Press the upper thread slightly above the tension bracket
(2) with a finger to stop the thread spooling out.
2.
Pull the upper thread downward so that the thread
take-up spring (3) is extended to the same height as the
base of the thread guide arm (4), and then measure the
tension of the thread take-up spring (3).
3.
Use a screwdriver to turn the tension stud (5) in order to
adjust the tension of the thread take-up spring (3).
NOTE:
If the thread tension spring (3) is not adjusted correctly, the upper thread trailing length will be uneven after thread
trimming.
7-3. Arm thread guide R
The standard position of arm thread guide R (1) is when the
screw (2) is aligned with the index mark.
Loosen the screw (2) and move the arm thread guide R (1) to
adjust.
・
When sewing heavy-weight material, move the arm
thread guide R (1) to the left. (The thread take-up amount
will become greater.)
・
When sewing light-weight material, move the arm thread
guide R (1) to the right. (The thread take-up amount will
become smaller.
Weaker
Stronger
3496B
Lower
Higher
3497B
More thread
Less thread
Index mark
3495B