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Z-8550A, 8560A
9. ADJUSTMENTS
69
9-3. Thread tension spring
<Thread tension spring position>
The standard position of the thread tension spring (1) is 5-8
mm above the surface of the thread guide (3) when the
presser foot (2) is lowered.
1. Lower the presser foot (2).
2. Loosen the set screw (4).
3. Turn the thread tension bracket (5) to adjust the spring
position.
4. Securely tighten the set screw (4).
<Thread take-up spring tension>
The standard tension of the thread tension spring (1) is 0.25
to 0.30 N.
1. Press the upper thread slightly above the thread tension
bracket (5) with a finger to stop the thread spooling out.
2. Pull the upper thread down until the thread tension spring
(1) starts to move down, and measure the tension of the
thread tension spring (1) at this point.
3. Insert the tip of a screwdriver into the groove in the thread
tension stud (6) and turn it to adjust the tension of the
thread tension spring (1).
NOTE: If using a tension gauge (7) (sold separately) to
measure the tension, take the reading from the scale
on the side of the red line.
3512M
3513M
Becomes weaker
Scale
Becomes stronger
3802M