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Adjusting the upper thread trailing length
The standard trailing length for the upper thread is 50-60
mm. If adjustment is necessary, adjust the position of the
wire as described below.
1
Loosen the set screw (1).
2
Turn the base (2) to adjust the vertical position of
the end of the wire (3).
• To increase the upper thread trailing amount,
raise the position of the wire (3) without letting it
touch the upper thread (4).
• To decrease the upper thread trailing amount,
lower the position of the wire (3) without letting it
touch the thread guide (5).
3
After adjusting, tighten the set screw (1).
At this time, keep the end of the wire (3) 1 mm away
from surface (A) of the thread guide (5).
If the tension of the pre-tension (6) is too strong, it will be more difficult to adjust the upper thread trailing
amount. The pre-tension (6) should be adjusted to as weak a tension as possible while still allowing the rotary
disc (7) to rotate smoothly.
The thread tension will change at this time, so be sure to re-adjust the upper thread tension. To learn more,
see Related Information.
Related Information
• Adjusting the thread tension on page 85
• Points to note when making adjustments on page 103
123
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