33
No
Symptom
Checkpoints
Root cause
Corrective action
5
Trimming miss
6
Too short thread
length after
trimming
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 trimming cam timing.
Adjust 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 working capacity.
Increase the volume adjustment.
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.
Trimming cam timing is bad.
Stroke of thread release 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.
Too much working capacity
Volume is adjusted to too low.
The gap between the
movable knife and the
hook
Check the tension of fixed
knife
Direction of the needle
Blade side of movable
and fixed knives
Trimming cam timing
Stroke of thread release
Trimming timing
Opening of the thread
tension adjusting plate
Tension of auxiliary thread
tension adjustment
assembly
Working capacity of take-
up lever spring
Thread release
adjustment volume on the
control box
Summary of Contents for KM-560
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