2-Thread-Overcast-Stitch - Silvercrest SON 90 A1 Operating Instructions Manual

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.
Textiles
blue
light
0.5
material
medium-
0.5
weight
material
heavy
1.0
material
Textiles
blue
light
-
material
medium-
-
weight
material
heavy
-
material
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.
Tensioning the thread
green red yellow
Inserting the
- 1.0
upper looper
element
Inserting the
- 1.5
upper looper
element
Inserting the
- 1.5
upper looper
element
Tensioning the thread
green red yellow
Inserting the
1.0 3.0
upper looper
element
Inserting the
1.5 3.5
upper looper
element
Inserting the
1.5 3.5
upper looper
element
Needle position
Seam width switch
Stitch length
Upper looper element
Correct thread tension
lower looper thread
Top
Incorrect thread tension
lower looper thread
Top
Incorrect thread tension
lower looper thread
Top
- 22 -
S
2 - 4
insert
needle thread
Underside
needle thread
Underside
needle thread
Underside
Fig. 56
Fig. 57
Fig. 58