16
Cause of Trouble and Troubleshooting
9
Trouble
Cause
Troubleshooting
Knife oscillation
1. Knife oscillation due to bad installation
2. Horizontal knife shaft oscillation
3. Knife shaft metal is loose
4. After sharpening, the sharp-end shifted
to the opposite position
5. Presser foot is loose
6. presser foot and feeding roller are too
close together
7. Feeding roller has bad quality (
凹 凸)
8. Center pin of the feeding roller support
arm is not inserted completely
1. Remove knife, thoroughly clean sides
that come into contact with the knife
2. Adjust and tighten knife shaft knot
3. Adjust knife shaft metal knot
4. Re-sharpen the blade to its proper
direction with the rod stone
5. Retighten presser foot tension screw
6. Lift presser foot with presser foot control screw
7. Replace bad feeding roller
8. Tighten center pin fixation screw after
pushing the center pin in completely
Wobbly cuts
1. Blade is damaged
2. Knife shaft oscillation from front to back
3. Knife shaft oscillation up and down
1. Sharpen the knife
2. Adjust and tighten knife shaft knot
3. Adjust by slowly tightening knife shaft
metal knot
Material does not enter
smoothly
1. Distance between the feeding roller and
knife is too close
2. Presser foot surface oscillation from
front to back
3. Bad cuts (dull blade)
4. Spring on the spring lever is too strong
1. Lower feeding roller slowly when the
material is thick
2. Replace presser foot with a new one
3. Sharpen the knife
4. Loosen the spring on the spring lever or
grind the presser foot path to allow the
material’s smooth entry
Material gets stuck in
the knife
1. Blade protrudes forward more than
presser foot
2. Presser foot protrudes downward more
than the blade
3. Feeding roller and knife are too wide apart
1. Rotates too fast
2. Feeding roller’s surface has bad quality
(
凹 凸)
1. V-belt is cut
2. Warm container is running out of oil
3. Feeding roller’s shaft is melting down
1. Not enough oil
2. Feeding roller’s shaft is melting down
1. Insufficient oil supply
2. Knife shaft and knife shaft metal knot
are too tight
1. Sharpening stone has oil stain
2. Sharpening stone has iron build-up
3. Flat belt is idling due to oil stain
1. Machine rotates too fast
2. Warm wheel shrank due to grinding
3. Insufficient oil supply
4. Clutch block is too eroded
5. Clutch lever is loose when clutch is
turned off
1. Adjust the distance between presser
foot and blade to 0~0.5mm
2. Lift presser foot up
3. Adjust with control screw
1.
Replace motor pulley with a smaller one
2. Replace bad feeding roller
1. Replace V-belt
2. Mix oil and grease in the warm container
3. supply oil to feeding roller shaft
1. Supply oil
2. Supply oil to feeding roller shaft
2. Make adjustment
1. Rotate sharpening stone and grind
stone with dresser
2. Place back the clutch that cleans the
flat belt oil stain
1. Change rotation to 1000~1200rpm
2. Replace
3. Supply oil on regular basis
4. Replace clutch block
Supply oil to clutch block
5. Adjust the clutch lever up so it does not
move
Waste not disposed
properly
Feeding roller does not
operate
Warm wheel erodes too
quickly
Knife shaft gets heated
Knife is still dull even
after sharpening
Noisy sound
