Silvercrest SON 90 A1 - Manual (Page 138)

Roll hemmings
With this machine you can sew four different roll hemming types. When
sewing roll hemmings, the fabric edge is folded over and provided with an
overlock seam. Lightweight fabrics such as batiste, chiffon, organza and
so on are best for these kinds of seams. Heavy fabrics or stiff materials are
not suitable for roll hemmings.
• Remove the left needle.
• Set the seam width switch d at "R" (Fig. 80).
• Align the support plate of the seam width finger on the marking "R"
on the stitch plate by turning out the seam width adjustment knob f
(Fig. 81).
• Place the dial for the stitch length 5 at "F - 2" (Fig. 82). With this a fine
seam is sewn.
• For roll hemmings use a needle with specification Nr. 14.
Tips:
• For a rolled hem many different combinations of yarn can be used. To
create a particularly beautiful rolled hem (3-thread rolled hem), use a
bushy yarn (bushy polyamid thread/woolly nylon) as the upper looper
yarn and normal yarn for the needle and lower looper. For a 2-thread
rolled hem use bushy yarn for the lower looper thread and normal yarn
for the needle thread.
• At the start of sewing hold the empty thread chain firmly so that they
cannot roll into the seam.
• Subject the material to slight tension in the sewing direction. This will
make the seam more delicate.
• Before cutting the thread chain close to the textile, apply a small drop
of fabric glue to the seam and allow it to dry. Check for colourfastness
on the textile prior to this.
3-thread rolled hem
Figure 83 shows you the stitch pattern for this stitch.
Adjust the thread tension selectors t z u to the appropriate values
(see table) then sew a test seam on the material being used.
3-thread upper looper overcast rolled hem
Figure 84 shows you the stitch pattern for this stitch. Adjust the thread tension
selectors t z u to the appropriate values (see table) then sew a test
seam on the material being used.
Upper looper
thread
Tensioning the thread
blue green red yellow
Polyester - 2.0 7.5 3.0
Bushy yarn - 2.0 2.0 2.0
Upper looper
thread
Tensioning the thread
blue green red yellow
Polyester - 2.0 5.5 7.0
Bushy yarn - 2.0 0 2.5
Needle position
Seam width switch R
Stitch length F - 2
Upper looper element not necessary
needle thread
lower looper thread
upper looper thread
Top
Underside
needle thread
lower looper thread
upper looper thread
Top
Underside
Fig. 81 Fig. 82
Fig. 83
Fig. 84
Fig. 80
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