Ad
j
us
ti
ng
the
l
ow
er
tens
i
on
Tako the bobbin case o
ut
of
the machi
ne
and regulate the tension
by
turning screw Z
(F
ig. 7} with the hook
se
r
ew
drlvor,
as
appropriate. Turn this serow cl
ock
wi
se
lor a tight-
er tension, or
co
unt
e
r·c
l
o
~
wiso
for a looser tension.
Tho tension is corroct
if
a notlcanble resistanco of spring Y (Fig. 7) h
as
to be
ove
1 come
when puHing the thread
out
of
the bobbin case.
If
puckering occurs on delicate moteriaJs a
lt
hough the tension has been sot correctly,
ooso
both tensions slightly.
11
.
Re
gulating the stitch le
ngth
The stitch length
io
regulated by turning thumb nut s
(F
ig
.
12J
on the feed regulator
lever.
R
9933
Fig. 12
Turn th
is
n
ut
cloc4(wlse f
of
shorter stitches,
or
counter·clockwlse
tor
long
er
stitches. The
numerals
on tho felt
of
the scale indicate tho slilch length In millimeter
s.
Tho tellers v
and R
on
the
loll
side
of
the scale (F.g. 12) stand for fotward and
bad<Ward
sevnng.
respective
ly.
12
'
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