Brother EF4-V41 - Puckering

Improper chaining-off (double chain stitching)
PROBLEM
<D Incorrect threading.
® Poor thread quality.
® Excessive tension disk pressure.
® Tension disk pressure too weak.
® Excessive presserfoot pressure
® Incorrect position of thread guide.
(l) Incorrect position of looper thread take-up
® Incorrect installation of main feed dog and
differential feed dog
® Chains get out of feed dog.
® Existence of clearance at pressing part for
chaining-off of presser foot.
ADJUSTMENT
~ Referto "Threading diagram."
~ Replace with good quality thread.
~ Adjust to suitable pressure.
~ Adjust to suitable pressure.
~ Adjust to suitable pressure.
~ Adjust to correct position.
~ Adjust to correct position.
~ Adjust position while maintaining the same level.
~ Move feed dog to right or left.
-+- Change it for a new one. For model V61, replace presser foot.
~
~K.
~ If there is a clearance here, you can not
__) perform chaining-off sewing.
® lncorrecttiming between needle and looper. ~ Adjusttocorrecttiming.
1§1 Puckering
PROBLEM
<D Excessive tension disk pressure.
® Thread size too thick.
® Excessive presser foot pressure.
® Needle size too big.
® Incorrect differential ratio.
® Height offeed dogs.
(l) Knife width too large.
® Knives are not sharp.
ADJUSTMENT
~ Adjust to appropriate pressure.
~ Change itforthinnerthread.
~ Adjustto suitable pressure.
~ Change it for one suitable for thread and materials.
~ Adjust to correct ratio.
~ Adjust to appropriate height.
~ Adjust to proper width.
~ Change them for new ones, or regrind.
(If the engagement of the upper and the lower knives is not correctly
adjusted, the knives do not cut the materials well. In this case, adjust so
the engagement is correct.)
-89-
From the library of: Superior Sewing Machine & Supply LLC