7. STANDARD ADJUSTMENTS
BAS-326H-484, BAS-326H-484 SF
36
7-3. Thread take-up spring
Thread take-up spring
height (mm)
2
−
4
Thread take-up spring
tension (N)
1.0
−
1.4
<Thread take-up spring height>
Loosen the set screw (1) and turn the adjuster to adjust.
<Thread take-up spring tension>
Turn the tension stud (2) with a screwdriver to adjust the
tension.
NOTE:
If the thread tension spring is not adjusted correctly, the upper thread trailing length will be uneven after thread trimming.
7-4. Arm thread guide R
The standard position of arm thread guide R (1) is when
the screw (2) is installed to the screw hole (3) on the left
side and the arm thread guide R (1) is pushed to the
right side as far as it will go.
To adjust the position, loosen the screw (2) and then
move arm thread guide R (1).
* If upper thread breakages or poor thread tightening
occur when sewing heavy-weight materials, move arm
thread guide R (1) to the left.
(The thread take-up amount will become greater.)
* If upper thread breakages or poor thread tightening
occur when sewing light-weight materials, install the
screw (2) to the screw hole (4) on the right side, and
then move arm thread guide R (1) to the left or right to
adjust its position.
(The thread take-up amount will become smaller.)
Lower
Higher
More thread
Less thread
4682M
4683M
Weaker
Stronger
3717B
