9. ADJUSTMENTS

9-3. Thread tension spring

3802M

3512M

<Thread tension spring position>

The standard position of the thread tension spring (1) is 5-8

mmabove 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).

Becomes stronger

Becomes weaker

Scale

3513M

<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.

69

Z-8550A, 8560A