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26
Oil amount
adjusting screw
Oil amount
adjusting screw
Oil amount
adjusting screw
3.5 Adjust the vertical stroke of presser foot (Fig. 25)
When stitch on the very elastic materials or the
thickness of sewing materials changes, the
adjustment should be done in the following order: .
.
.
.
A. Loosen the special stud.
B. When the central line distance between the special
stud and the presser foot lifting rear crank becomes
shorter, the vertical stroke of presser foot will
become longer, on the contrary, the distance becomes
longer, the stroke will become shorter.
C. After adjustment, tighten the special stud. The
common vertical stroke of presser foot can be
adjusted within the range of 2 6mm.
3.6 Adjust the hook oil amount (Fig. 26)
It adopts plunger full auto-lubricating system, even
at a very low speed, it still can supply and suck oil
very well. Generally, only the hook oil amount can
be adjusted, the others cannot be adjusted. The hook
oil amount can be controlled by the oil amount
adjusting screw. First loosen the nut of adjusting
screw, turn the screw clockwise to increase the oil
amount, on the contrary, decrease the oil amount.
After adjustment, tighten the nut. .
Increase Increase Increase
Decrease
Increase Increase Increase
DecreaseDecreaseDecrease
Special stud
Crank link
Crank