Table of Contents
Advertisement
Trouble
5. Stitch skipping
1 T h e m o t i o n s o f t h e n e e d l e
often occurs.
2 T h e c l e a r a n c e b e t w e e n t h e
3 The needle is bent.
4 The driver excessively bends the
6. The needle
1 The needle thread tension is not
thread comes
out on the wrong
2 The tension release mechanism
side of the
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. Thread end of
1 Stitch skipping at the 1st stitch
the 1st stitch
comes out on
2 Needle used and thread used
the right side of
the material.
3 Intermediate presser is not
8. Threads break
1 T h e m o v i n g k n i f e h a s b e e n
at time of thread
trimming.
9. The thread
1 The needle thread at the sewing
clamp is
entangled with
needle thread.
10. Uneven length
1 The tension of thread take-up
of the needle
thread
11. The length of
1 The tension of thread tension
needle thread
does not
2 The tension of thread take-up
become short.
3 The tension of thread take-up
12. The knotting
1 Idling of bobbin is large.
section of
2 The bobbin thread tension is too
bobbin thread
at 2nd stitch at
3 The needle thread tension at 1st
the sewing start
appears on the
right side.
13. Wiper fails to
1 Needle entry of the last needle is
work. (Return is
defective.)
Cause
and shuttle are not properly
synchronized.
needle and shuttle is too large.
needle.
high enough.
fails to work properly.
trimming is too long.
of needle thread protrudes on the
wrong side of sewing product.)
are thick in terms of the inner
diameter of the intermediate
presser.
properly positioned in terms of
the needle.
improperly position.
start is too long.
spring is too low.
controller No. 1 is too low.
spring is too high.
spring is too low and motion is
unstable.
low.
stitch is too high.
the same as that of the sewing
start, and the resistance of
thread and cloth is large.
Corrective measures
™ Correct the positions of the needle and
shuttle.
™ Correct the positions of the needle and
shuttle.
™ Replace the bent needle.
™ Correctly position the driver.
™ 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. 1.
™ 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.
Adjust the hook timing faster by a 1/2
™
stitch.
I n c r e a s e t h e i n n e r d i a m e t e r o f
™
intermediate presser.
Adjust the eccentricity between
™
intermediate presser and needle so
that needle enters in the center of
intermediate presser.
™ Correct the position of the moving
knife.
™ Tighten thread tension controller No. 1
and make the length of needle thread
40 to 50 mm.
™ Increase the tension of the thread
take-up spring.
™ Increase the tension of thread tension
controller No. 1.
™ Decrease the tension of thread take-
up spring.
™ Increase the tension of thread take-
up spring and lengthen the stroke as
well.
™ A just the position of the moving knife.
™ Increase the bobbin thread tension.
™ Decrease the needle thread tension at
1st stitch.
™ Turn OFF the thread clamp.
™ Shift the needle entry point of the last
needle.
– 123 –
Page
114
114
15
114
17
17
116
21
19
17
19
116
17
Advertisement
Table of Contents
