Silvercrest SON 90 A1 - Manual (Page 132)

2-thread-overcast-stitch
Figure 56 shows you the stitch pattern for this stitch.
This stitch with a needle and 2 threads is used for tidying normal fabrics
with an overcast stitch. It is also ideal for flat stitch seams (fell or butt seams)
and blind hemming.
By changing the needle position you can obtain a narrow or a wide overcast
seam.
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.
For this type of stitch insert the upper looper element in the upper looper o.
Should the lower looper yarn lie on the underside of the textile (Fig. 57):
• 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 needle yarn be too loose (Fig. 58):
• turn the thread tension selector for the needle (blue r or green t) to a
higher number.
• turn the thread tension selector for the lower looper thread u (yellow)
to a lower number.
Textiles
Tensioning the thread
blue green red yellow
light
material
0.5 -
Inserting the
upper looper
element
1.0
medium-
weight
material
0.5 -
Inserting the
upper looper
element
1.5
heavy
material
1.0 -
Inserting the
upper looper
element
1.5
Textiles
Tensioning the thread
blue green red yellow
light
material
- 1.0
Inserting the
upper looper
element
3.0
medium-
weight
material
- 1.5
Inserting the
upper looper
element
3.5
heavy
material
- 1.5
Inserting the
upper looper
element
3.5
Needle position
Seam width switch S
Stitch length 2 - 4
Upper looper element insert
Top
Underside
Correct thread tension
lower looper thread
needle thread
Incorrect thread tension
Top
Underside
lower looper thread
needle thread
Incorrect thread tension
Top
Underside
lower looper thread
needle thread
Fig. 58
Fig. 57
Fig. 56
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IB_64780_SON 90 A1_LB5 09.03.2011 16:22 Uhr Seite 130