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No. Phenomenon Item to be checked Cause Corrective measure
5
Thread trimming
failure
Clearance between the
moving knife and the hook
Height of the moving knife and
that of the hook do not match.
Re-adjust the installation
position of the moving knife.
Check the pressure ap-
plied to the counter knife
The moving knife and the
counter knife do not match
with respect to their pressure
and position.
Correct the pressure applied
to the moving knife and count-
er knife, as well as correct the
installation of those knives.
Orientation of the needle
The needle is not inserted
correctly.
Re-insert the needle correctly.
Blades of the moving knife
and counter knife
The moving knife and counter
knife have aws and worn out.
Change the moving knife or
the counter knife with a new
one.
Thread trimming cam tim-
ing
The timing of thread trimming
cam is not correct.
Adjust the timing of thread
trimming cam appropriately.
Tension releaser stroke
The stroke of tension releaser
is too small.
Re-adjust the stroke of ten-
sion releaser appropriately.
6
The length of
needle thread
remaining at the
needle (on the
material) is too
short.
Thread trimming timing
Thread trimming timing is not
correct.
Adjust the timing of thread
trimming appropriately.
Opening of the thread
nipper bar
Opening of the thread nipper
bar is too small.
Increase the opening of the
thread nipper bar.
Thread tension of the ten-
sion controller No. 1
Thread tension provided by
the tension controller No.1 is
too strong
Decrease the thread tension
provided by the tension con-
troller No.1.
Operating quantity of the
thread take-up spring
The operating quantity of the
thread take-up spring is too
large.
Adjust the thread take-up
spring appropriately.
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