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Trouble
6. The needle thread
1 The needle thread tension is not
comes out on the
wrong side of the
2 The tension release mechanism
material.
3 The needle thread after thread
4 Number of stitches is too few.
5 When sewing length is short (End
6 Number of stitches is too few.
7. T h r e a d s b r e a k
1 Th e m o v i n g k n i fe h a s b e e n
at time of thread
trimming.
8. The thread clamp
1 The needle thread at the sewing
is entangled with
needle thread.
9. Uneven length of
1 The tension of thread take-up
the needle thread
0. T h e l e n g t h o f
1 The tension of thread tension
needle thread does
not become short.
2 The tension of thread take-up
3 The tension of thread take-up
. T h e k n o t t i n g
1 Idling of bobbin is large.
section of bobbin
2 The bobbin thread tension is too
thread at 2nd stitch
at the sewing start
3 The needle thread tension at st
a p p e a r s o n t h e
right side.
Cause
high enough.
fails to work properly.
trimming is too long.
of needle thread protrudes on the
wrong side of sewing product.)
improperly position.
start is too long.
spring is too low.
controller No. is too low.
spring is too high.
spring is too low and motion is
unstable.
low.
stitch is too high.
－
Corrective measures
™ Increase the needle thread tension.
™ Check whether or not the tension disc
No. 2 is released during bar-tracking.
™ Increase the tension of the thread
tension controller No. .
™ Correct the position of the moving knife.
™ Turn OFF the thread clamp.
™ Turn OFF the thread clamp.
™ Use the lower plate, the hole of which
is larger than the presser.
™ Correct the position of the moving knife.
™ Tighten thread tension controller No.
and make the length of needle thread
33 to 36 mm.
™ Increase the tension of the thread take-
up spring.
™ Increase the tension of thread tension
controller No. .
™ Decrease the tension of thread take-up
spring.
™ Increase the tension of thread take-up
spring and lengthen the stroke as well.
™ Adjust the position of the moving knife.
™ Increase the bobbin thread tension.
™ Decrease the needle thread tension at
st stitch.
™ Turn OFF the thread clamp.
56
－
Page
5
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