Baby Lock Lauren (BL450A) Instruction and Reference Guide - Manual (Page 17)

15
thread tension -Method A
Use the chart below as a guide in setting tension.
The tension adjustments for Method A are the same as 1-needle, 3-thread
overlock. See page 13 if adjustments are needed.
ROLLED HEMMING -Method B
The upper looper thread encases the fabric edge in Method B rolled hem, creating a softer finish.
Settings and sewing of Method B rolled hem are the same as the Method A narrow hem except for thread tension.
(See below)
thread tension -Method B
Regulate the tension dials using guide below.
NARROW HEMMING -Method A
Pull the excess threads gently toward the back and begin sewing.
Although the stitch width is set at 1.5 mm, you will actually need 3.5 mm
(about 1/8") to provide enough fabric for the fold back.
1.5 mm
3.5 mm
NOTE:
This table is a guide
for thread tensions
when sewing with #80
to #90 polyester spun
threads.
Needle thread is too loose. Upper looper thread is too loose. Lower looper thread is too loose.
Light & Medium
Fabric
Upper
Looper
Thread Lower
Looper
Thread Needle
Thread
(Right)
1.5-3.5 2.0-4.0 2.0-4.0
Correct 3-thread
narrow overedge
tension
Upper
Looper
Thread
Right side
of fabric
Wrong side
of fabric
Lower
Looper
Thread
Needle
Thread
NOTE:
This table is a guide
for thread tensions
when sewing with #80
to #90 polyester spun
threads.
Light & Medium
Fabric
Upper
Looper
Thread Lower
Looper
Thread Needle
Thread
(Right) Correct 3-thread
rolled hem tension
Upper
Looper
Thread
Needle
Thread
Lower
Looper
Thread
Wrong side
of fabric
Right side
of fabric
Increase Needle Thread Tension
and/or Decrease Upper Thread
Tension. Increase Upper Looper Thread
Tension. Increase Lower Looper Thread
Tension and/or Decrease Upper
Looper Thread Tension.
1.5-3.5 2.0-4.0 4.0-7.0