SanDisk AMS-210EN/IP-420, Инструкция по эксплуатации

Страница: 132 / 135

– 128 –
1-13. Troubles and corrective measures (Sewing conditions)
Trouble Cause Corrective measures Page
1. The needle
thread slips off
at the start of
bar-tacking.
① Stitches are slipped at the start. ◦ Adjust the clearance between the needle
and the shuttle to 0.05 to 0.1 mm.
116
◦ Set soft-start sewing at the start of
bartacking.
96
② The needle thread remaining on
the needle after thread trimming
is too short.
◦ Correct the thread tension release
timing of the thread tension controller
No. 2.
◦
Increase the tension of the thread
take-up spring, or decrease the tension
of the thread tension controller No. 1.
22, 23
③ The bobbin thread is too short. ◦ Decrease the tension of the bobbin
thread.
22
◦ Increase the clearance between the
needle hole guide and the counter knife.
119
④ Needle thread tension at 1st
stitch is too high.
◦ Decrease the tension at 1st stitch.
⑤
Thread clamp is unstable
(material is apt to be expanded,
thread is hard to slide, thread is
thick, etc.).
◦
Decrease the number of rotation at
1st stitch at the sewing start. (Extent
of 600 to 1,000 rpm)
◦ Increase the number of stitches of
thread clamp to 3 to 4 stitches.
⑥
Pitch at 1st stitch is too small.
◦
Make the pitch at 1st stitch longer.
◦ Decrease the needle thread tension at
1st stitch.
2. Thread often
breaks or
synthetic fiber
thread splits
finely.
① The shuttle or the driver has
scratches.
◦ Take it out and remove the scratches
using a fine whetstone or buff.
② The needle hole guide has
scratches.
◦ Buff or replace it.
③ The needle strikes the
intermediate presser foot.
◦ Correct the position of the intermediate
presser foot.
23
④ Fibrous dust is in the groove of
the shuttle race.
◦ Take out the shuttle and remove the
fibrous dust from the shuttle race.
⑤ The needle thread tension is too
high.
◦ Reduce the needle thread tension. 22
⑥
The tension of the thread take-up
spring is too high.
◦
Reduce the tension. 23
⑦ The synthetic fiber thread melts
due to heat generated on the
needle.
◦ Use silicone oil. 130
⑧ When taking up thread, thread is
pierced with needle tip.
◦ Lower the needle bar height from the
engraved marker line by a half of the
line to as much as the line.
◦ Check the rough state of needle tip.
◦ Use the ball-pointed needle.
3. The needle
often breaks.
①
The needle is bent.
◦
Replace the bent needle. 19
②
The needle strikes the
intermediate presser foot.
◦
Correct the position of the intermediate
presser foot.
23
③
The needle is too thin for the
material.
◦
Replace it with a thicker needle
according to the material.
④ The driver excessively bends the
needle.
◦ Correctly position the needle and the
shuttle.
116
4. Threads are not
trimmed.
①
The counter knife is dull.
◦
Replace the counter knife.
② The difference in level between
the needle hole guide and the
counter knife is not enough.
◦ Increase the bend of the counter knife.
③ The moving knife has been
improperly positioned.
◦ Correct the position of the moving
knife.
119
(Bobbin thread only)
④
The last stitch is skipped.
◦
Correct the timing between the needle
and the shuttle.
116
⑤ Bobbin thread tension is too low. ◦ In crease the bobbin thread tension.
⑥ Flopping of cloth ◦ Lower the intermediate presser height
of the last stitch.