5.
6.
5.
6.
4
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
6.
5
1.
2.
3.
4.
1. ,
2. ,
3.
4.
28 Common breakdowns and measures of trouble shooting
No.
Breakdown
cause measures to be laken
1
Thread
breakage
1. Poor thread quality
2. Thread being too thick
3. Fusing thread due to high
temperature of needle caused
by machine's operation at high
speed
4. Tension being too higher
5. Breakage of needle, looper, throat
plate,and needle guard at the
location of thread guide
6. Failure to adjust thread amount
1. Quality thread to be used.
2. Replacment to be made by an appropriate
thread
3. Silicone oil to be used and speed to be reduced
4. The tension nut to be loosened
5. First grinding with oil stone and then polishing
6. adjusting the thread amount adjusting plate
2
skipping
stitch
1. skipping stitch of needle thread
( leaking of two stitches due to the
looper's failure to hook the needle
thread)
1. adjusting thread-hooking amount of looper
2. adjusting clearance between looer and needle
3. The timing of needle in reference to looper
4. adjusting the thread-amount adjusting plate on
thread amount changing conditions.
5. adjusting the frame thread eyelet
6. checking whether the mounting postion of the
needle is proper or not
7. To see if the location of needle guard is in an
appropriate way and the timing of it is well
regulated in relation to another
8. To see if the needle thread threading is in a
proper way
2. Skipping stitch of bobbin thread
( leaking of one stitch, needle's
failure to enter the looper
eyelet)
1. Reference to the above cases 1 and 2, as to
skipping stitch of the needle thread.
. 17 .
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