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Balanced tensions are essential icr sewing
Both tensions are correctly balanced f the
needle and dobbin threads interlock .n the
center of the material
The bobbin thread tension is regulated by
turning the small knurled screw on the bob
bin case (Fig. 1).
Turn this screw right (with your thumb nail)
for a tighter tension, or left for a looser ten
sion.
the same size threacs are used
n the
needle and on the oobbin. there s no need
to adlust the bobbin threaa tension.
This tension
s set correctly if a sight re
sstance nas to be overcome when pulling
the thread.
Numbers 0 to 10 indicate different degrees
of tension on the upper tension dial (Fig 21
The higher the number, the tighter the ten
sion
For ordinary sewng operations, the
ucper tension should be set between 3 and 5
Please note: Ease both :ensions somewnat
for sewing Silk and other delicate fabrics.
16
The accessory box which belongs to your
machine contains several sewing feet for
special sewing operations,
'7o change tne sewing foot. bring the needle
to ts highest point and raise the foot
T
rn
out screw ,l 16) until the sewing foot can be
removed, tilting t sideways (see Figs. 1 &
2)
ider.
foot is
attached
in
the reverse
For, sewing elastic fabrics, attach ordinary
sewing foot No. 93-838954-00 rather than
clear-view sewing foot No 93-1001 79-00.
1
oottori
100
Upper tension too tight or lower tension too
loose.
bottom
,
/
top
Upper
tension
too
.oose
or
lower
tension
too tignt.
bottom
top
Both tensions correctly balanced
y
3
2
To change the needle, oring the needle bar
to its highest point and lower the sewing
foot. Loosen needle set screw (22) and pull
lhe old needle out of the needle clamp.
Insert new needle and push it up as far as
it
will
go (Fig. 3), making sure that the flat
side of its shank aces toward the back.
Tighten screw (221 secureiy.
Use system 130 needles as indicated in the
table on the inside rort cover
17
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