Silvercrest SON 90 A1 - Manual (Page 136)

3-thread safety stitch, highly elastic, imitated
Figure 71 shows you the stitch pattern for this stitch.
This stitch with 2 needles and 3 threads is ideal for lightweight, extremely
stretchy fabrics such as jersey and spandex.
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.
If the lower looper thread is too loose (Fig. 72):
• turn the thread tension selector for the lower looper thread u (yellow)
to a higher number.
Should the left needle yarn be too loose (Fig. 73):
• turn the thread tension selector for the left needle r (blue) to a higher
number.
Should the right needle yarn be too loose (Fig. 74):
• turn the thread tension selector for the right needle t (green) to a higher
number.
Textiles
Tensioning the thread
blue green red yellow
light
material
2.0 1.5
Inserting the
upper looper
element
0
medium-
weight
material
3.0 2.0
Inserting the
upper looper
element
0.5
heavy
material
4.0 3.0
Inserting the
upper looper
element
1,0
Needle position
Seam width switch S
Stitch length 2 - 4
Upper looper element insert
Correct thread tension
Top Underside
Incorrect thread tension
Left needle thread
lower looper thread Right needle thread
Top
Underside
Left needle thread
lower looper thread
Right needle thread
Top
Underside
Left needle thread
lower looper thread
Right needle thread
Fig. 72
Fig. 73
Fig. 74
Top
Underside
Left needle thread
lower looper thread
Right needle thread
Fig. 71
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IB_64780_SON 90 A1_LB5 09.03.2011 16:22 Uhr Seite 134