COMPUTER-CONTROLLED HIGH SPEED LOCKSTITCH BAR TACKING MACHINE
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Needle thread is stepped
on by the work clamp
foot at the start of sewing
(Needle bend)
wiper.(23 to 25mm)
4.
Threads are
not
trimmed.
The counter knife is dull.
The difference in level
between the needle hole
guide and the counter
knife is not enough.
The moving knife has been
improperly positioned.
The last stitch is skipped.
Bobbin thread tension is
too low.
Replace the counter knife.
Increase the bend of the counter knife.
Correct the position of the moving knife.
Correct the timing between the needle and the
shuttle.
In crease the bobbin thread tension.
5.Stitch
skipping
often
occurs.
The motions of the needle
and shuttle are not
properly synchronized.
The clearance between the
needle and shuttle is too
large.
The needle is bent.
The driver excessively
bends the needle.
Correct the positions of the needle and shuttle.
Correct the positions of the needle and shuttle.
Replace the bent needle.
Correctly position the driver.
6.The needle
thread
comes out
on the
wrong side
of the
material
the needle thread tension is
not high enough.
The tension release
mechanism fails to work
properly.
The needle thread after
thread trimming is too
long.
Number of stitches is too
few.
When sewing length is
short(End of needle
thread protrudes on the
wrong side of sewing
product.)
Number of stitches is too
few.
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.
Use the lower plate, the hole of which is larger
than the presser.
