Brother International Z-8550A Instruction Manual - English - Page 69

Adjusting the thread tension spring, <Thread tension spring position&gt

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12. STANDARD ADJUSTMENTS 12-3. Adjusting the thread tension spring 3511M 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). 3512M Becomes stronger Becomes weaker Scale 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 he 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. 3513M 61 Z-8550A, 8560A

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Z-8550A, 8560A
12. STANDARD ADJUSTMENTS
61
12-3. Adjusting the 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 tension 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 he 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
3511M
3513M
Becomes
weaker
Scale
Becomes
stronger