- 24 -
needle thread
upper looper thread
needle thread
lower looper thread
Underside
Top
3-thread - flatlock seam
Figure 63 shows you the stitch pattern for this stitch.
This stitch with a needle and 3 threads is used for fell or butt seams and for
ornamental stitches with decorative thread. By changing the needle position
you can obtain a narrow or a wide flatlock seam (flatlock).
Adjust the thread tension selectors r t z u to the appropriate values
(see table) then sew a test seam on the material being used.
Should the lower looper yarn be too loose (Fig. 64):
• turn the thread tension selector for the lower looper thread u (yellow)
to a higher number, or ...
• turn the thread tension selector for the needle (blue r or green t) to a
lower number.
Should the upper looper yarn be too loose (Fig. 65):
• turn the thread tension selector for the upper looper thread z (red) to a
higher number, or ...
• turn the thread tension selector for the needle (blue r or green t) to a
lower number.
Should the needle yarn be too loose (Fig. 66):
• turn the thread tension selector for the needle (blue r or green t) to a
higher number.
• turn the thread tension selector for the upper looper thread z (red) to a
lower number.
Textiles
Tensioning the thread
blue green red yellow
light
material
0.5 - 2.5 2.5
medium-
weight
material
0.5 - 2.0 2.0
heavy
material
1.0 - 3.0 3.0
Textiles
Tensioning the thread
blue green red yellow
light
material
- 0 7.0 4.0
medium-
weight
material
- 0.5 7.0 4.0
heavy
material
- 1.0 7.0 4.0
Needle position
Seam width switch
S
Stitch length
2 - 4
Upper looper element
not necessary
Correct thread tension
Incorrect thread tensions
Top
Underside
needle thread
lower looper thread
upper looper thread
needle thread
Top
Underside
needle thread
lower looper thread
upper looper thread
needle thread
Top
Underside
needle thread
lower looper thread
upper looper thread
needle thread
Fig. 63
Fig. 64
Fig. 65
Fig. 66
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