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1818
20. Adjusting the alternating amount of presser foot (Fig.18)
When the presser foot is alternating increasingly,
adjust it upward in the range of the long hole of the
top feed crank; when the presser foot is alternating
decreasingly, adjust it downward, then tighten the
nut 2.
When the lifting amount of the presser and walking
presser foot is different, first align the bottom of the
presser foot and walking presser foot with the surface
of the needle plate, then loosen the set screw 1.Turn
the balance wheel to the front, tighten screw 2, then
the lifting amount of the presser foot is more than that
of the walking presser foot. Turn the balance wheel
reversingly, then the lifting amoung of the walking
presser foot is more than that of the presser foot.
Remove the right side of the window plate, then the
top feed crank 3 can be observed.
21. Sewing speed list
Altenating amount
Less than 3mm
Less than 3~4mm
Less than 4~6.5mm
Stitch between 6mm-9mm
2000rpm
2000rpm
1600rpm
Set the sewing speed according to the different condition. Do not surpass the standard data.
Stitch less than 6mm
2500rpm
2000rpm
1600rpm
22. Troubleshooting22. Troubleshooting
Trouble RemedyPossible cause
1. Thread breaking (2-3mm
thread left on the cloth)
1. Damage on the rotating hook set
groove of thread way, needle point,
rotating hook point and needle plate.
2. Too strong the needle thread tension
3. Collision between needle and rotating
hook.
4. Too little the oil of the rotating hook
5. Too weak the needle thread tension.
6. Too strong the tension of the threaad
take-up spring
7. Over fast or slow the timing between
needle and rotating hook
1. Refer to (9.Threading the bobbin
thread)
2. Rast with sand paper or file.
3. Replace the bobbin or rotating hook
4. Increase the bobbin thread tension.
5. Reduce the bobbin thread tension.
6. Replace the needle.
2. Weaken the needle thread tension.
3. Refer to (19.Relationship between
needle and rotating hook.)
4. Adjust the oil amount (Refer to7.
Lubrication)
5. Increase the needle thread tension.
6. Weaken the tension of the thread
take-up spring.
7. Refer to (19. Relationship between
needle and rotating hook)
1. Polish the damaged part with sand
paper; rasp the middle rotating hook set
groove with file.
2. Puckering
1. Over fast or slow the timing between
needle and rotating hook.
1. Refer to (19. Relationship between
needle and rotating hook).
2. Too weak the pressure of the presser
foot.
3. The clearance between the up end of
the needle and the rotating hook is not
right.
4. Wrong needle.
2. Tighten the pressr foot adjusting
screw.
3. Refer to (19.Relationship between
needle and rotating hook.)
4. Replace the needle.
3. Loose stitch
1. Without threading the bobbin thread
under the spring of the thread tension
of the rotating hook body.
2. Bad work on thread way.
3. No movement of bobbin.
4. Too weak the bobbin thread tension.
5. Too strong the bobbin thread tension.
6. Damage of the needle point.