Inspection and
Adjustment
Inspection and
Adjustment
4 - 44
Adjustment Lower thread tension
[Standard]
When the schappe spun thread #60 is pulled from the inner rotary hook assy slowly with
the tension gauge, the thread tension should be 0.1 to 0.12 N (10 to 12 gf).
[Adjustment]
1. Remove the 2 screws 1 of the needle plate assy, and remove the needle plate assy.
2. Remove the inner rotary hook assy from the machine.
3. Set the bobbin (the schappe spun thread #60) in the inner rotary hook assy, and pass the thread through the
groove of the thread tension plate.
*Key point
• Pass the thread through into the back of the groove of the thread tension plate.
4. Pull the thread slowly from the inner rotary hook assy with the tension gauge, and measure the thread tension.
5. Adjust the thread tension by turning the tension adjusting screw of the inner rotary hook assy.
*Key point
• The tension adjusting screw is secured with the thread locker.
6. Secure the tension adjusting screw to the inner rotary hook assy by applying a small amount of the thread
locker to the tension adjusting screw.
1
Screw
needle plate
Inner rotary hook assy
Bobbin
Thread tension plate
Schappe spun thread #60
Schappe spun
thread #60
Tension adjusting screw
Flat screwdriver
Inner rotary hook assy
Schappe spun thread #60
0.1 - 0.12 N (10 - 12 gf)
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