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Adjustment Procedure
6) Adjustment of rise of the second thread tension disc
1. How to check the amount of rise of the second thread tension
disc
1. Set the thread take-up lever slightly in front of the upper
dead point.
2. Raise the presser.
3. When the thread trimming solenoid ❶ is pushed to the max-
imum level, the standard rising amount of the second thread
tension disc ❹ is 1.0 to 1.5 mm.
2. How to adjust the amount of rise of the second thread tension
disc
<When increasing the amount of rise>
Loosen the thread tension release wire fixing screw ❷ and move
the thread tension release wire ❸ to the right.
<When decreasing the amount of rise>
Loosen the thread tension release wire fixing screw ❷ and move
the thread tension release wire ❸ to the left.
(Caution) After adjustments, tighten the thread tension release
wire fixing screw ❷ assuredly.
Results of Improper Adjustment
○ If the amount of rise of the second
thread tension disc ❹ is too small,
the needle thread length becomes
short at the time of thread trimming
and this can be a cause of thread
entanglement and needle thread
castoff errors at the beginning of
sewing.
– 54 –
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