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Singer 81K70 - Page 8

Singer 81K70
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12
To
Regulate
the
Pressure
on
the
Material
The
pressure
on
the
material
is
regulated
by
means
of
the
thumb
screw (A, Fig. 13).
To
increase
the
pressure,
turn
this
thumb
screw
downwardly.
To
decrease
the
pressure,
turn
the
thumb
screw
upwardly.
To
Regulate
the
Length
of
Stitch
The
h•ngth of
stitch
is
regulated
by
means
of
the
adjusting
screw (H,
F'ig.l:l)
inthefPedeccentric.
Thisscrcwfacesdirectly
outward.
Fra.
13.
ADJUSTMENTs
ON
nr;;
MAcHINE
To
change
the
length
of
stitch,
turn
the
balance
wheel unti1
the
lock
screw in
the
feed eccentric
appears
in
the
hole of
the
cover
((~.
Fig. 13).
This
screw
faces
slightly
downward.
Loosen
the
lock screw.
Then
turn
the
balance
wheel
until
the
adjusting
screw
(H) is visible
through
the
hole in
the
cover
(G).
Turn
the
adjust-
ing screw
(II)
over
to
the
right
for a long
stiteh.
Turn
this
screw
over
to
the
left for a
short
stitch.
Then
turn
the
balance
wheel
over
unlilthe
lock serew
appears
and
securely
tighten
this
screw.
INSTRUCTIONS
FOR
ADJUSTERS
AND
MACHINISTS
To
Set
the
Needle
Bar
at
the
Correct
Height
Remove
the
throat
plate
in
order
lo
obtain
a c!Par
vi1·w
of
the
needle
and
looper.
Now
turn
the
balance
wheel over from you unl
il
l
h1·
IHTdlt•
bar
has risen
3
3
2
inch from
its
lowest position.
ThP
point of t
ht•
left
hand
looper,
on
its
loop
taking
slrokP,
should
Llll'n be at t
l!t'
eenler
of
the
needle,
and
lhe
eye of tlw needle
should
lw about.
,',,
inch below
the
looper
point.
If
the
nrcdle
bar
is
notal
t lw
l'OIT1TI
height,
loosPn
the
pinch
screw (K, Fig.
1:1)
and
movt•
the
lll'l'di!'
bar
upward
or
downward
as
requirPd,
lhen
securely
tighten
t be
pinch screw
(K).
FIG.
14.
To
C:nANGE
TilE
NEV,IJLP:
BAH
SnWKIS
To
Change
the
Stroke
of
the
Needle
Bar
A
variation
in
the
amount
of needlr
bar
slrokP
can
lw
ohtainl'd
by
adjusting
the
ball
stud
(0,
Fig. 14).
To
lcngtlll'll
lllP
stroL<',
loosen
the
two
set
screws (L, Fig.
14)
in
Lhe
needle
bar
n:tnk
and
move
the
hall
stud
inwardly
or
toward
t
lw
nank.
To
slwrlcn
l
lw
stroke
of
the
needle
bar,
move
lhe
ball
stud
outwardly
or
:m:ty
frotn
the
crank,
then
securely
lighten
the
sPl.
sn\'ws
(L).
From the library of: Superior Sewing Machine & Supply LLC

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