JUKI AMS-221ENTS, Инструкции по эксплуатации

Страница: 132 / 135

– 128 –
Trouble Cause Corrective measures Page
5. Stitch skipping
often occurs.
①
The motions of the needle
and shuttle are not properly
synchronized.
◦
Correct the positions of the needle and
shuttle.
115
② The clearance between the
needle and shuttle is too large.
◦ Correct the positions of the needle and
shuttle.
115
③
The needle is bent.
◦
Replace the bent needle. 11
④ The driver excessively bends the
needle.
⑤
Length of needle thread
remaining after thread trimming
is too long. (In the case of stitch
skipping within the 2nd to 10th
stitch from the beginning of
sewing)
◦ Correctly position the driver.
◦
Reduce the thread take-up spring
pressure or increase the thread
tension applied by the thread tension
controller No. 1.
115
15,17
6. The needle
thread comes
out on the wrong
side of the
material.
① The needle thread tension is not
high enough.
◦ Increase the needle thread tension. 15
② The tension release mechanism
fails to work properly.
◦ Check whether or not the tension disc
No. 2 is released during bar-tracking.
③ The needle thread after thread
trimming is too long.
◦ Increase the tension of the thread
tension controller No. 1.
15
④ Number of stitches is too few. ◦ Turn OFF the thread clamp.
⑤ When sewing length is short (End
of needle thread protrudes on the
wrong side of sewing product.)
◦ Turn OFF the thread clamp.
⑥ Number of stitches is too few. ◦ Use the lower plate, the hole of which
is larger than the presser.
7. Thread end of
the 1st stitch
comes out on
the right side of
the material.
① Stitch skipping at the 1st stitch ◦ Adjust the hook timing faster by a 1/2
stitch.
② Intermediate presser is not
properly positioned in terms of
the needle.
◦ Adjust the eccentricity between
intermediate presser and needle so
that needle enters in the center of
intermediate presser.
8. Threads break
at time of thread
trimming.
①
The moving knife has been
improperly position.
◦
Correct the position of the moving
knife.
119
9. The thread
clamp is
entangled with
needle thread.
①
The needle thread at the sewing
start is too long.
◦
Tighten thread tension controller No. 1
and make the length of needle thread
45 to 55 mm.
18
10. Uneven length
of the needle
thread
① The tension of thread take-up
spring is too low.
◦ Increase the tension of the thread
take-up spring.
16
11. The length of
needle thread
does not
become short.
① The tension of thread tension
controller No. 1 is too low.
◦ Increase the tension of thread tension
controller No. 1.
15
② The tension of thread take-up
spring is too high.
◦ Decrease the tension of thread take-
up spring.
16
③ The tension of thread take-up
spring is too low and motion is
unstable.
◦ Increase the tension of thread take-
up spring and lengthen the stroke as
well.
12. The knotting
section of bobbin
thread at 2nd stitch
at the sewing start
appears on the
right side.
①
Idling of bobbin is large.
◦
A just the position of the moving knife. 119
②
The bobbin thread tension is too low.
◦
Increase the bobbin thread tension. 15
◦ Turn OFF the thread clamp.
13. Wiper fails to
work. (Return is
defective.)
① Needle entry of the last needle is
the same as that of the sew-
ing start, and the resistance of
thread and cloth is large.
◦ Shift the needle entry point of the last
needle.