Caution:
1.To prevent the unexpected startup of sewing machine, trim off the power supply
before the operation is conducted.
2.If the feed lifting eccentric cam is turned too far in the direction A, it may cause
the needle to break.
3.To prevent material slippage from occurring,retard the needle timing.
4.To improve thread tightening, adv ance the needle timing.
28
Adjustment of t he Height of f eed d og(Fig. 3 5)
Fig.34
A
②
①
B
Standard
Needle timing
is retarded
Needle timing
is advanced
③
1.Turn the pulley until the feed dog rises to the
highest position.
2.Turn over the sewing machine head on the
supporting bar.
3. Unscrewing the tightened screw ① in the
feed lifting crank
②.
4.Rotating the feed lifting crank
② to make
adjustment:
the feed dog will be higher when the feed lifting
crank ② is turn towards A direction;
turn towards B direction the feed dog will be
lower.(When the feed dog in the highest position,
the standard height of the type of medium-heavy
machine is 0.8~1.0mm and standard height of the
heavy duty machine is 1.1~1.3mm.
5.Remember to tighten the tightening screw
①
in
the feed lifting crank
② after adjusting.
Fig.35
①
②
A B
A:Feed dog
B:Needle plate
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