22
Troubleshooting
8.Improper lower thread winding length
[Example of phenomenon] [Check item before adjustment]
Is the upper thread threaded on the thread guide?
Is the upper thread threaded on the lower thread guide?
Is the lower thread threaded properly through the bobbin
hole?
Step Item Diagnosing Method Standard
Reference
Page
1. Bobbin
Winding
amount of
lower
thread
<Condition>
Thread: Cotton yarn # 60
Wind-up: When the wound thread contacts
the bobbin stopper and the bobbin
stops
<Diagnosis>
Set the bobbin on the bobbin winder
shaft.
When the bobbin has returned to the
original position (to left) after winding up
the lower thread, measure the states of
winding (A, B).
A: Winding deviation
B: Winding amount
A = 1.5 mm or less
B = 1.5 to 2.0 mm
[Adjustment]
page.36
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