Singer 231-25 User manual

SINGER
231-25

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
7
USE
SINGER*
OILS
and
LUBRICANTS
They
insure
freedom
from
lubricating
lrnuble
and
give longer life
lo sewing
equipment
The
following
is
tlie
correct lubricant
for
tlie
134w, 152
and
231
Machines:
TYPE
D -
MANUFACTURING MACHINE
OIL,
HEAVY GRADE
OTHER
SINGER
LUBRICANTS
TYPE
E -
THREAD LUBRICANT
For lubricating the
needle
thread
of
sewing machines
for
stitching fabrics
or
leather
where
a thread
luliricont
is
required.
TYPE
F -
MOTOR
OIL
For
oil
lubricated
motors
and plain
bearings
in
power
tables and transmitters.
NOTE:
All
of the above
oils
are
available
in
1 quart,
1 gallon and 5 gallon
cans.
GEAR LUBRICANT
This specially
prepared
grease
is
recommended
for
gear
lubrication
on manufacturing sewing machines.
BALL BEARING LUBRICANT
This pure grease
is
specially
designed
for
the
lubrication
of
boll bearings and
ball
thrust bearings
of
motors and
electric
transmitters,
ball
bearing hangers
of
power
!alilos,
etc.
Furnished
in
1 lb.
ond
4 lb.
tins.
l
!
I
20631
ADJUSTERS
MANUAL
FOR
SINGER*
SEWING
MACHINE
231-25
TWO
NEEDLES
AND
TWO
LOOPERS
TWO-THREAD
CHAIN
STITCH
FEED
-OFF -
THE
-ARM
Special
attention
is
called
to the lubricating instructions on
pages
6
and
7.
TH~
SING~R
MANUFACTURING COMPANY
*A
lrade
Mark
of
THE
SINGER MANUFACTURING
COMPANY

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
TO ALL WHOM
IT
MAY CONCERN:
The
improper
placing
or
renewal
of
the
Trade
Mark
"SINGER"
or
any
other
of
the
Trade
Marks
of
The
Singer
Manufacturing
Company
(all
of
which
are
duly
Registered
Trade
Marks)
on
any
machine
that
has
been
repaired,
rebuilt,
reconditioned,
or
altered
in
any
way
whatsoever
outside
a
SINGER
factory
or
an
authorized
SINGER
agency
is
forbidden.
THE
IMPORTANCE OF USING
SINGER*
PARTS
AND NEEDLES
IN
SINGER
MACHINES
The
successful
operation
of
SINGER
machines
can
only
be
assured
if
SINGER
parts
and
needles
are
used.
Supplies
;ire
available
at
all
SINGER
Shops
for
the
Manufacturing
Trade,
and
mail
orders
will
receive
prompt
attention.
SINGER
Needles
should
be
used
in
SINGER
Machines
These
Needles
and
their
Containers
are
marked
with
the
Company's
Trade
Mark
"SIMANCO."'
1
Needles
in
Containers
marked
"FOR
SINGER
MACHINES"
are
NOT
SINGER
made
needles.
2
Copyright,
U.S.
A., 1934, 1935, 1941
and
1948
by
The
Singer
Manufacturing
Company
All
Rights
Reserved
for
All
Countries
3
DESCRIPTION
FEED-OFF-THE-ARM MACHINE
231-25
has
two
needles
and
two
loopers
and
makes
the
two-thread
chain
stitch
for
lap
seam
felling
boys'
shirts,
pajamas
and
other
tubular
work
in
light
and
medium
weight
fabrics.
It
is
especially
suitable
for
closing
boys'
shirt
sleeves
when
the
cuff
is
attached
before
the
sleeve
is
closed,
as
the
needles
are
set
diagonally
so
that
the
left
hand
needle
starts
the
stitching
close
to
the
cuff line.
The
machine
may
be
furnished
in
gauges
from
3/32
to
l / 4
inch,
as
ordered.
A
splash
oiling
system
oils
the
feed
and
looper
mechanism.
The
needle
bar
driving
mechanism
is
oiled
through
a
hollow
shaft
from
an
oil
reservoir
at
the
machine
pulley
end.
CAUTION
After
setting
up,
do
not
start
the
machine,
not
even
to
test
the
speed,
until
it
has
been
thoroughly
oiled,
as
instructed
on
pages
6
and
7.
SPEED
The
machine
should
be
driven
at
a
speed
not
exceeding
4200
revolutions
per
minute
for
the
first
two
or
three
days,
ofter
which
it
can
be
driven
up
to its
maximum
speed
of
4300
revolutions
per
minute,
depending
on
the
nature
of
the
work
and
the
ability
of
the
operator.
When
the
machine
is in
operation,
the
top
of
the
mach\ne
pulley
turns
over
toward
the
operator.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
4
SETTING
UP
Unpack
and
clean
the
machine.
Attach
the
bed
extension
lo
the
machine
bed
as
shown
in
Fig
6.
Insert
the
two
rubber
cushions
E,
Fig.
2
into
the
holes
in
the
base
of
the
machine.
Place
the
machine
in
position
with
the
edge
of
the
machine
base
in line
with
the
edge
of
the
table
as
shown
below,
and
see
that
the
hole
D
for
the
presser
bar
lifter
chain
is
in line
with
the
hole
in
the
table
plank.
C
A
(
rs
\ D
Fig. 2
The
two
vibration
dampeners
A and
B,
Fig. 2
are
placed
at
the
rear
of
the
machine
base
and
al
the
right
of
the
bed
extension
as
shown
in
Fig. 2.
Attach
the
straight
straps
C
to
the
machine
base
and
bed
extension,
then
locate
and
drill
holes
in
the
table
and
fasten
the
angle
straps
B
of
the
dampeners
to
the
table
with
l /
4
x 2-l /
4
inch bolts.
5
The
cylinder
arm
cover
of
the
machine
should
be
levelled
by
placing
shims
under
the
rubber
cushions
or
the
vibration
dampeners.
Place
a
spirit
level
crosswise
on
the
flat
arm
cover
plate,
and
set
the
machine
with
its
arm
rotary
shaft
perfectly
level
so
that
the
oil will
not
flood
the
needle
bar
driving
mechanism
in
the
head.
Then
place
the
spirit
level
lengthwise
on
the
flat
cover
plate
and
set
the
arm
of
the
machine
level.
Check
the
setting
occasionally
to
keep
the
machine
level.
-~
<'.X:>
,
~><,=:::,~
~"<,.
~.
~
~.
1/
~
~Xo2
• I
N
--
/
t
%{<\
'/
..
..
~-
/
,-----~--.._
-
--
-
--·
-,.-~
L~~~,79,,,
•.
Fig.
3
Belt
Guard
139398,
02,
Fig.
3,
may
be
used
either
with
a
paral-
lel
set-up,
or
with
an
oblique
set-up
using
an
idler
pulley.
When
an
idler
pulley
is
used,
it
is
attached
to
the
machine
bed
extension
as
shown
in
Fig.
6.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
6
OILING
THE
MACHINE
Fig. 4
NOTE: All
of
the
oil is
drained
from
the
cylinder
arm
reservoir
before
the
machine
is
shipped
from
the
factory,
therefore
it is abso-
lutely necessary
that
the machine be thoroughly oiled
according
to
the
following
instructions
before it
is
started
in
operation:
Use
"TYPE
D"
OIL,
sold
by
Singer
Sewing
Machine
Company.
For
description
of
this
oil,
see
inside
front
cover
of
this
book.
See
"X-ray"
view
of
machine
on
pages 12
and
13.
l.
After
the
machine
has
been
set
up
so
that
its
cylinder
arm
cover
is
level,
lift
out
the
gauge
L,
Fig. 4
and
fill
the
arm
reservoir
to
the
level
of
the
mark
on
the
gauge.
Run
the
machine
a
few
min-
utes,
then
wipe
off
the
gauge
and
recheck
the
oil
level.
THIS
RESER-
VOIR SHOULD
BE
FILLED
ABOUT TWICE A WEEK OR OFTEN
ENOUGH
TO
KEEP
THE
OIL
LEVEL
UP
TO
THE
MARK
ON
THE
GAUGE.
2. Turn
the
machine
pulley
to
bring
the
screw
plug
M,
Fig. 5
to
the
top,
remove
this
plug
and
fill
the
reservoir
practically
to
the
top.
THE
OIL
LEVEL
IN
THIS RESERVOIR SHOULD NEVER
BE
ALLOWED
7
TO
GO
BELOW
THE
HOLE
AT
THE
CENTER OF
THE
ARM SHAFT.
If
the
oil is
down
to
the
bottom
of
this
hole,
add
oil
before
starting.
Other-
wise
run
the
machine
a
few
minutes
before
adding
oil
to
this
reservoir.
3.
Place
about
5
drops
of
oil
in
each
of
the
three
cups
J,
H
and
G, Fig. 4
which
lubricate
the
ball
bearings,
and
in
the
cup
N,
Figs.
3
and
6
on
the
idler
pulley
under-
neath
the
machine
pulley.
DO THIS
ABOUT ONCE A WEEK.
NOTICE:
When
the
machine
is
first
set
up,
or
after
it
has
been
idle
for
same
time,
put
a
few
drops
of
oil in
the
top
of
the
needle
bar
guide
pin
F,
Fig. 4
before
starting
the
machine.
Fig. 5
OIL
DRAIN.
Surplus
oil
from
the
bearings
drains
into
the
wells
at
the
rear
of
the
base
0,
Fig. 6
and
in
the
head
of
the
arm
G1, Fig.
22.
These
wells
moy
be
kept
empty
by
soaking
out
the
oil
with
waste
or
similar
material.
Fig. 6
Oil
which
accumulates
in
the
front
of
the
bed
un-
der
the
rotary
shaft
shou
Id
be
drained
out
occasionally
by
removing
the
screw
plug
at
K,
Fig. 4 in
the
bottom
of
the
arm,
to
prevent
oil
from
getting
on
the
looper
thread
take-up.
NOTE:
If
an
excessive
amount
of
oil
should
flow
into
the
reservoir
Gl,
Fig.
22,
see
instructions
for
re-
placing
the
wicking
in
the
arm
shaft
crank
on
page
23.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
8
NEEDLES
Needles
for
Machine
231-25
are
of
Class
and
Variety
149
x l
and
are
made
in
sizes
11,
14,
16,
17,
18
and
19.
The
size
of
the
needles
to
be
used
should
be
determined
by
the
size
of
the
thread,
which
must
pass
freely
through
the
eyes
of
the
needles.
If
rough
or
uneven
thread
is
used,
or
if it
passes
with
difficulty
through
the
eyes
of
the
needles,
the
machine
cannot
stitch
perfectly.
Orders
for
needles
must
specify
the
QUANTITY
required,
the
SIZE
number,
and
the
CLASS
and
VARIETY
numbers
separated
by
the
letter
x.
The
following
is
an
example
of
an
intelligible
order:
"100
No.
17,149
x l
Needles"
The
best
stitching
results
will
be
obtained
when
using
needles
sold
by
Singer
Sewing
Machine
Company.
TO
SET
THE
NEEDLES
Turn
the
machine
pulley
over
toward
you
vntil
the
needle
bar
moves
up
to
its
highest
point,
and
loosen
the
two
set
screws
in
the
needle
clamp.
Place
the
needles
up
into
the
needle
clamp
as
far
as
they
will
go,
with
the
single
continuous
groove
in
each
n~edle
to-
ward
you,
then
tighten
the
two
set
screws.
TO
REGULATE
THE
TENSIONS
The
tension
on
the
needle
threads
is
regulated
by
the
thumb
nuts
above
the
tension
discs
at
the
top
of
the
machine.
The
needle
threads
require
sufficient
tension
to
set
the
stitch
properly
in
the
goods.
The
tension
on
the
looper
threads
is
regulated
by
turning
the
screw
at
the
front
of
the
looper
thread
tension
plates
D10,
Fig.
15,
page
14,
to
the
right
for
more
tension
or
to
the
left
for
less
tension.
The
looper
threads
should
have
only
enough
tension
to
control
the
thread.
9
TO
OPEN
THE
LOOPER
GATES
To
thread
the
loopers
or
for
adjustments
at
the
end
of
the
cylinder
arm,
open
the
looper
gates
as
instructed
below.
fig.
7
fig.
8
TO OPEN
THE
LEFT
LOOPER
GATE-With
the
forefinger
of
the
left
hand,
pull
out
the
gate
Pin
the
direction
of
the
arrow
as
shown
in
Fig. 7
and,
with
the
thumb,
turn
the
gate
down
to
the
locking
position
shown
in
Fig.
8.
l
>_:=
~:~>"
E 2211.\5
fig.
9
fig.
10
TO
OPEN
THE
RIGHT
LOOPER
GATE-With
the
forefinger
of
the
right
hand,
pull
out
the
gate
Qin
the
direction
of
the
arrow
as
shown
in
Fig.
9
and,
with
the
thumb,
swing
the
gate
out
to
the
right
to
the
locking
position
shown
in
Fig.
l 0.
NOTE:
Play
in
the
looper
gates
may
be
removed
by
adjusting
the
small
lock
spring
on
the
inside
of
each
gate.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
10
THREADING
THE
NEEDLES
Turn
the
machine
pulley
until
the
needle
bar
1s
at
its
highest
position.
TO THREAD
THE
LEFT
NEEDLE,
bring
the
thread
from
the
left
spool
A1, Fig.
11
on
the
unwinder,
down
through
the
hole
A2
in
the
thread
guide
bar,
then
down
through
each
of
the
eyelets
A3,
A4
and
AS, Fig.
12
in
the
thread
straightener
as
shown.
Pass
the
thread
through
eyelet
A6,
around
between
the
rear
tension
discs
A7,
through
eyelet
AS,
through
the
rear
eyelets
in
the
thread
guide
A9,
Fig. 13
and
the
take-up
thread
guides
A
10
and
A
11,
down
under
the
retainer
spring
and
through
the
rear
eyelet
A
12
in
the
take-up,
down
behind
the
wire
guide
A
13,
and
from
front
to
back
through
the
eye
of
the
left
needle
A
14.
TO THREAD
THE
RIGHT
NEEDLE,
bring
the
thread
from
the
sec-
ond
spool
Bl,
Fig.
11
on
the
unwinder,
down
through
the
hole
B2
in
the
thread
guide
bar,
then
down
through
each
of
the
eyelets
B3,
B4
and
BS,
Fig. 12
in
the
thread
straightener
as
shown.
Pass
the
thread
through
the
wire
guide
B6,
through
eyelet
B7,
around
be-
tween
the
front
tension
discs
BS,
through
eyelet
B9,
through
the
front
eyelets
in
the
thread
guide
BlO, Fig. 13
and
the
take-up
thread
guides
Bl
1
and
Bl
2,
down
under
the
retainer
spring
and
down
through
the
front
eyelet
B13
in
the
take-up,
down
behind
the
wire
guide
B14
and
from
front
to
back
through
the
eye
of
the
right
needle
B15.
Draw
about
two
inches
of
thread
through
the
eyes
of
the
needles
with
which
to
commence
sewing.
11
A3
◄
-B3
A4
-B4
AS
-BS
A6
lxA2
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11
Fig.
12
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Fig. 13

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
12
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,.-,.--:•:::.:.~""
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13
"X-ray" View of
Machine 231-2S

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
14
THREADING THE LOOPERS
Turn the machine pulley until the needle bar is at its lowest
point to bring the loopers into position for threading. Open the
right looper gate as instructed on page 9, also open the cover plates
on the front and top of the horizontal arm.
TO THREAD THE FRONT LOOPER or the one nearest the operator,
bring the thread from the right-hand spool D1, Fig. 11, page 11, on
the unwinder, down through the hole D2 in the thread guide bar,
then downward through each of the eyelets D3, D4 and D5, Fig. 14
in the thread straightener
as shown. Pass the thread
through the ferrule at the
end of the thread tube D6
and out through the hole at
D7, then pass it from the
hole at D8 down through
the lower ferrule of the
thread tube, as shown in
Fig. 15. The thread will au-
tomatically slip through the
spiral slot into the tube. In
the same way, pass the
thread through the lower
horizontal tube D9, then
..,_03
04
between the first and sec- Fig. 14
ond tension plates D10, through the front eyelet D11, through the
hole in the casting into the wire guide D12, Fig. 16, under the
)~C~ - i\ ~~, D8
,-c_..~ --~ .. ~~1<s23.Ji
Fig. 15
take-up stripper D13, into the guide D14, in1o the front slot D15
and under the wire guard, down behind the thread retaining plate
D16, through the thread tube D17, Fig. 17, through the front hole
D18 in the looper thread guide, through the hole D19 in the heel
15
of the front looper, and from front to back through the eye D20 of
the looper.
TO THREAD THE REAR LOOPER, bring the thread from the spool
Cl, Fig. 11 on the unwinder, down through the hole C2 in the thread
"111,.DIL :ro
,.,. °"" c."v,;~
D
(l)
Cl
-
Fig. 16
guide bar, then downward through each of the eyelets C3, C4 and
CS, Fig. 14 in the thread straightener, as shown. Pass the thread
through the ferrule at the end of the thread tube C6, through the
hole at C7, then from the hole at CS through the lower ferrule of the
thread tube, as shown in Fig. 15, allowing the thread to slip through
the spiral slot into the thread rr1
tube. In the same way, pass ~D20 \i.6;
the thread through the upper
1
~ 1111111,c-,-'-'"~
horizontal tube C9, between )----' .-,,;,_-::c-
the second and third tension - "-
1
plates C10, through the rear ::.-, __;.. fl
eyelet C11, through the hole j D19 :t_~
in _the casting into the w!re Dia:,, UII ,
11
guides C12 and C13,. Fig. ) -~'iJ __ iJI' -=- ~ ~
16, under the take-up stripper -::==:;:::_:::>- ~~ U ·.
C14, into the guide C15, into ~----- ---=~
the rear slot C16 and under rw@;s ~ C-lB CI9
the wire guard, down behind ~~D17 eiss,,
the thread retaining plate Fig. 17
C17, through the thread tube C18, Fig. 17, through the rear hole
C19 in the looper thread guide, through the hole C20 in the heel
of the rear looper and from front to back through the eye C21 of
the looper.
Draw about two inches of thread through the eye of each
looper with which to commence sewing.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
16
TO REGULATE THE PRESSURE ON THE MATERIAL
The pressure of the presser foot on the material should be
heavy enough so that the feed will move the work evenly. To in-
crease the pressure, turn the wing nut S downward. To decrease
the pressure, turn the wing nut S upward.
. '
': ©
®.!J-9
R . ~:-.:...,..:
Fig. 18
TO REGULATE THE LENGTH OF STITCH
The length of the stitch is controlled by the feed eccentric,
which may be adjusted by removing the screw plug V, Fig. 18 in the
front of the bed cover.
First turn the machine
pulley to bring the lock
screw W, Fig. 19 under-
neath the hole, and
loosen this lock screw.
Then turn the large
screw X, which projects
beyond the body of the
eccentric, to the left or
outward for a longer
stitch, or to the right
for a shorter stitch.
Tighten the lock screw
W and replace the
screw plug.
w
Fig. 19
17
TO TIME AND SET THE LOOPERS IN RELATION TO THE NEEDLES
The loopers should be at the end of their backward stroke, with
the points farthest from the needles, at the same time that the
needle bar is at its lowest point. In this position, the point of the
front looper should be about 9/ 64 inch from the center of the front
Fig. 20
needle. The loopers may be moved to this position after loosening
the clamping screw Y, Fig. 20. The looper timing is set by having the
first (when turning toward the operator) of the two set screws in the
looper eccentric Zl, Fig. 26 bear against a flat on the shaft.
If the belt has been removed or disturbed, the lower shaft must
be timed by loosening the two set screws and the cap screw Yl and
X 1, Fig. 25 in the lower belt pulley, and turning the lower shaft
until the loopers are correctly timed with the needles. Tighten the
cap screw Xl first, then the two set screws.
TO TIME THE NEEDLE-AVOIDING MOTION OF THE LOOPERS
The sidewise or needle-avoiding motion is produced by the
eccentric at the right of the feed eccentric, on the lower shaft. The
loopers should just clear the back of the needles on their forward
stroke, and should clear the front of the needles on the backwi:ird

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
18
stroke.
A
change
in
the
timing
of
the
eccentric
will
make
the
loopers
come
closer
to
or
farther
from
the
needles
and
therefore
a
different
setting
is
required
for
different
sizes
of
needles.
This
eccentric
is
set
for
size
17
needles
when
the
machine
leaves
the
factory.
To
adjust
the
eccentric,
remove
the
arm
cover
and
turn
the
ma-
chine
pulley
until
one
of
the
two
set
screws
app")ars
under
the
hole
M2, Fig.
26.
loosen
this
screw
about
a
quarter-turn,
leaving
it
below
the
surface
of
the
eccentric
so
that
it will
not
score
the
in-
side
of
the
bearing.
Bring
the
other
set
screw
under
the
hole,
loosen
it
and
leave
the
screwdriver
in
the
slot
to
hold
the
eccentric
while
turning
the
shaft
to
obtain
the
desired
adjustment.
To
bring
the
loopers
the
same
distance
from
the
needles
on
their
forward
and
backward
strokes,
they
may
be
moved
sideways
on
the
looper
shaft
after
loosening
clamping
screw
Y,
Fig.
20.
Fig.
21
TO
SET
THE
NEEDLE
GUARD
The
function
of
the
needle
guard
Z, Fig.
20
is
to
prevent
the
needles
springing
into
the
path
of
the
loopers
when
the
loopers
are
on
their
forward
stroke.
The
needle
guard
should
be
set
as
close
as
possible
to
the
needles
without
touching
them.
To
set
the
needle
guard,
loosen
the
set
screw
B
1,
Fig.
21
underneath
the
end
of
the
cylinder
arm
and
move
the
needle
guard
to
ihe
correct
position.
TO
SET
THE
FEED
DOG
AT
THE
CORRECT
HEIGHT
When
the
feed
dog
is
at
its
highest
point,
practically
the
full
depth
of
the
teeth
should
project
through
the
slots in
the
throat
plate.
The
feed
dog
may
be
raised
or
lowered
by
turning
the
eccen-
tric
pin
El,
Fig.
21
a
part
of
a
turn
in
either
direction.
19
THREAD
CUTTER
To
remove
the
thread
cutter
blade
for
honing,
take
out
the
two
screws
Cl,
Fig.
21.
TO
SET
THE
NEEDLE
BAR
When
the
points
of
the
loopers
reach
the
centers
of
the
needles
on
the
upward
stroke
of
the
needle
bar,
the
eyes
of
the
needles
should
be
about
l
/8
inch
below
the
looper
points,
so
that
the
eyes
of
the
needles
and
the
eyes
of
the
loopers
will
be
in
per-
fect
alignment
when
they
pass
each
other.
The
needle
bar
may
be
raised
or
lowered
after
loosen-
ing
the
clamping
screw
Ql,
Fig.
22.
TO
SET
THE
NEEDLE
THREAD
TAKE-UP
The
needle
thread
take-
up
01,
Fig.
22
is
usually
set
so
that
the
top
of
its
clamp
is
about
1
/16
inch
below
the
top
of
the
needle
bar.
KI
LI
P2-----+0
~.-"°',
~
I
Fig. 22
,
MI
NI
01
Pl
ADJUSTMENT
OF
THE
AUXILIARY
THREAD
TAKE-UP
The
auxiliary
thread
take-up
Ml,
Fig.
22
at
the
front
of
the
machine
should
be
set
high
enough
so
that
it
takes
up
the
slack
of
the
needle
threads
after
the
loopers
have
shed
the
needle
loops
and
as
the
needle
bar
finishes
its
downward
stroke
and
the
stitch is
set.
For
some
threads
it will
be
necessary
to
set
the
auxiliary
thread
take-up
at
a
height
different
from
that
required
by
others,
owing
to
the
differences
in
finish,
twist,
elasticity,
etc.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
TO
ADJUST
THE
NEEDLE
THREAD
TENSION
RELEASER
The
function
of
the
needle
thread
tension
re-
leaser
is
to
release
the
t e n s i o n
on
the
needle
threads
when
the
presser
foot
is
raised.
If
the
tension
releaser
does
not
release
the
threads
when
the
presser
foot
is
raised,
or
if
the
tension
is
partially
released
when
the
presser
foot
is
20
down,
loosen
the
set
screw
Fig. 23
Sl,
Fig. 23
and
turn
the
shaft
Rl
to
the
right
or
left
until
the
correct
adjustment
is
obtained,
then
tighten
the
set
screw.
TO
SET
THE
NEEDLE
THREAD
EYELET
The
needle
thread
eyelet
U,
Fig. 18
shou'.d
be
set
so
that
when
the
loopers
are
shedding
the
needle
loops
on
their
backward
stroke,
the
thread
will
not
snap
off
the
points
of
the
loopers
nor
be
drawn
through
the
tension
discs
with
enough
tension
to
break
the
thread.
To
set
the
needle
thread
eyelet,
it
is
best
to
start
it in a
low
position
and
continue
raising
it until
the
loopers
back
out
of
the
needle
loops
with
a little
tension
on
the
thread.
TO
TIME
THE
LOOPER
THREAD
TA.KE-UP
The
straight
part
of
the
take-up
Ul,
Fig.
24
should
touch
the
thread
between
the
take-up
stripper
wires
Tl
just
as
the
loopers
(/)
KEEP
OIL
TO
0
MARK
ON
GAUGE
Fig. 24
21
start
their
backward
or
loop-shedding
motion.
The
take-up
acts
also
as
a
thread
pull-off
and
should
draw
most
of
the
thread
through
the
tension
discs
on
the
backward
stroke
of
the
loopers,
so
that
the
loopers
on
their
forward
stroke
will just
draw
the
thread
taut
or
pull
a
small
amount
of
thread.
The
take-up
may
be
advanced
to
draw
more
thread
during
the
back
stroke,
or
retarded
to
draw
less
thread,
after
loosening
the
set
screw
in
the
hub
of
the
take-up.
TO
TIME
THE
FEED
The
set
screw
N2,
Fig.
26 in
the
feed
eccentric
should
bear
against
the
flat
on
the
shaft.
The
feed
lifting
eccentric
is
connected
to
the
looper
eccentric
and
is
timed
as
instructed
on
page
19.
TO
REMOVE
AND
REPLACE
THE
ARM
SHAFT
CONNECTION
BELT
Remove
the
needles
to
prevent
damage
while
the
needles
and
loopers
are
out
of
time.
Unscrew
the
machine
pulley
oil
reservoir
from
the
shaft.
Loosen
the
two
set
screws
in
the
machine
pulley
belt
groove,
and
remove
the
machine
pulley.
Take
out
the
two
screws
which
hold
the
belt
guard
cover
and
remove
the
cover.
The
belt
may
be
easily
slipped
off
the
lower
belt
pulley,
then
the
upper
pulley.
---
' -
#:
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z
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--~>-/:__,,it
(cjp····
/ #
1/
·~
,~-~~==---
"-------._
11~~~-~~
--
U86U
•
m
-----1
_________
!
Fig. 25