Table of Contents
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No
Symptom
The gap between the
movable knife and the
hook
Check the tension of
fixed knife
5
Trimming miss
Direction of the needle
Blade side of movable
and fixed knives
Trimming cam timing
Thread release stroke
Trimming timing
Opening of the thread
tension adjusting plate
Tension of auxiliary
Too short
thread tension
6
thread length
adjustment assembly
after trimming
Thread take up stroke
Thread release
adjustment volume on
the control box
30
Checkpoints
The height and distance between the
movable knife and the hook do not
match
Tension and contact of movable and
fixed knives are bad
Needle is not inserted correctly
Scratch and abrasion of movable and
fixed knives
The timing of trimming cam is wrong
Thread release stroke is too small
Wrong trimming timing
The opening on the thread tension
control plate is too small
Too strong tension on the auxiliary
thread tension control assembly
Thread take up stroke is too large
Volume is adjusted to too low
Root cause
Readjust the movable knife setting
position
Correct the tension adjustment and
surface contact of movable and fixed
knives.
Insert the needle correctly
Replace movable knife or fixed knife
Adjust the timing of trimming cam
Readjust the thread release stroke
Adjust the trimming timing
Adjust the thread release stroke
Adjust the tension of the auxiliary thread
tension control assembly
Adjust the thread take up stroke
Increase the volume adjustment
Corrective action
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Table of Contents
