Brother 884-B20 Owner's Manual page 13

Fabric puckers
Reduce the needle thread tension of the left needle
thread first 1 , then of the right needle thread 2 .
Upper looper thread visible from reverse of
fabric
Increase the tension of the upper looper thread,
reduce the tension of the lower looper thread, or
adjust both thread tensions.
Lower looper thread visible from surface of
fabric
Reduce the tension of the upper looper thread,
increase the tension of the lower looper thread, or
adjust both thread tensions.
A: Reverse
B: Surface
C: Left needle thread
D: Right needle thread
A: Reverse
B: Surface
E: Upper looper thread
F: Lower looper thread
A: Reverse
B: Surface
E: Upper looper thread
F: Lower looper thread
Large loops because upper looper thread or
lower looper thread extends past edge of the
fabric
Increase the tension of the upper looper thread
and the lower looper thread.
Stitching puckers
Reduce the tension of the upper looper thread and
the lower looper thread.
NOTE:
For details on these operations, watch the video.
https://s.brother/cvtkb/
A: Reverse
B: Surface
E: Upper looper thread
F: Lower looper thread
A: Reverse
B: Surface
E: Upper looper thread
F: Lower looper thread
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