5
Troubleshooting
2.Troubleshooting
1.Improper tightness of stitches
[Example of phenomenon] [Check item before adjustment]
Are upper and lower threads threaded properly?
Is the combination of needle and thread adequate for the
fabric?
Step Item Diagnosing Method Standard
Reference
Page
1. Upper thread
tension dial
Upper thread
tension
<Condition>
Upper thread tension dial: "5"
Thread: Cotton yarn # 60
<Diagnosis>
Pass the upper thread from the spool
of thread to the thread guide, pull the
thread vertically and measure the ten-
sion (A) when the value has stabilized.
(Using a measuring instrument)
A = 0.85 to 1.15
N
[Adjustment]
page.33
2. Bobbin case
Lower thread
tension
<Condition>
Thread: Cotton yarn # 60
<Diagnosis>
After setting the bobbin in the bobbin
case, pull out the lower thread through
the lower thread guide. Measure the
tension (A) when the value has stabi-
lized. (Using a measuring instrument.)
A = 0.3 to 0.4 N
[Adjustment]
page.33
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