7. STANDARD ADJUSTMENTS
BAS-311HN, BAS-326H
39
7-3. Thread take-up spring
Specifications
Medium-weight materials
(-03[])
Heavy-weight materials
(-05[])
Seatbelt (-07A)
Thread take-up spring
height (mm)
7 − 10 2 − 4
Thread take-up spring
tension (N)
0.2 − 0.5 0.6 − 1.2 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>
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 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 aligned with the index mark.
Loosen the screw (2) and move arm thread guide R (1) to
adjust.
* When sewing heavy-weight material, move arm thread
guide R (1) to the left. (The thread take-up amount will
become greater.)
* When sewing light-weight material, move arm thread
guide R (1) to the right. (The thread take-up amount will
become smaller.)
3548B
Lower
Higher
3641B
3123B
Low
High
More thread
Less thread
Index mark
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