Brother EF4-V41 - Slippage Cloth; Double Scooping (Overlocking)

[1] Slippage cloth
PROBLEM
<D Excessive pressure of presser foot.
® Knives are not sharp.
@ Feed dog too high.
ADJUSTMENT
~ Adjust to suitable pressure.
-.. Change them for new ones or regrind.
-.. Adjusttoa lower level.
00 Double scooping (overlocking)
PROBLEM
ADJUSTMENT
<D Under looper have flaws.
-.. Change it for a new one or smooth surface with oil stone or buff.
® Insufficient angle of under looper.
-.. Increase angle.
-90-
From the library of: Superior Sewing Machine & Supply LLC