Singer 270 Service Manual
Form
Rev.
21290
(1166)
SINGER
Service
CLASS
Manual
270
*k
Trademark
of
THE
SINGER
COMPAN'
THE
Copyright © 1966
Copyright
All
Rights
SINGER
under
Reserved
COMPANY
by
The
Internotion
under
Inter-American
Singer
Company
Copyright
Copyright
Union
Union
Printed
In
U.
S.
A.
DESCRIPTION
INSTALLATION
LUBRICATION
OPERATOR
MACHINE
BLOWER
PARTS
INFORMATION
ADJUSTMENTS
INSTALLATION
CHART
CONTENTS
Page
3
4
5
3-7
8-28
29
31
INDEX
Adjustment
Adjustments
Loop
Reel
Trimming
Description
General
Feed
Driving
Lateral
Sequence
on
Throat
Pick-up
Holder
Knives
of
Characteristics.
Mechanism
Gears
Linkage....
Longitudinal
Timing
Timing
Installation
Machine
Blower
Knife
Lateral
Longitudinal
Unit
Actuating
Lifting
Work
Clamp
Pull-off
Safety
Tension
Thread
Loop.
Devices
Releaser...
Wiper
Lubrication
Daily
Care
Needle
Setting
Stitching
the
Troubles
Underside
Plate
of
Finger
Position
Stop
Machine..
Adjustments
Linkage
Feed
Feed
and
Clamp
Adjustments
Foot
Lifter....
Needle
8
26-28
27
26
....26,
27
3
3
.......14-20
14
14, 16,
16,
17,
18
19
20
....20
4
29
12,
13
13
13
12
13
13
5
5
6
6
6
Sewing
Sewing
Sewing
Difficulties
Mechanism
Needle
Hook
Hook
Bar
Positioning
Timing...
Reel
Height
Speed
Stop
Motion
Arm
Engaging
Starting
Starting
Tripping
Stop
Motion
Threading
Thread
Adjustments
Shaft........
Arm
Lever
Lever
Linkage
Brake
the
Machine
Stripper
Retracting
Finger
Retracting
Stripper
Thread
Tripping
Winding
Pre-Tension......
Reel
Thread
Plate
Finger
Finger
Tension
Points
Linkage
Driver
Clamping
Adjustments
(Longitudinal)
Arm
Stop
and
Adjustments.
Follower
Adjustments
Adjustments
Adjustments
Tripping
Points
Action..
7
....22,
23
23
22
22
....28
5
9-11
9
10
9
10
11
21
6
25
25
25
25
7
..21
23,
24
24
24
23
TOALL
other
Registered
reconditioned,
foctory
The
improper
of
or
WHOM
IT
placing
the
Trademarks
Trademarks)
or
an
authorized
MAY
CONCERN:
or
of
on
altered
SINGER
renewal
The
Singer
any
machine
in
any
agency
of
the
Compony
that
way
whatsoever
is
Trademork
(all
has
been
forbidden.
SINGER*
of
which
repaired,
outside a SINGER
or
any
are
duly
rebuilt,
Machines
ing
and
sewing
parallel
cylinder
to
the
with
of
Class
two
and
cylinder
right
angle
270
ore
single
four
hole
buttons
when
sewing
cross-over
needle,
stitches
single
on
clothing.
two
hole
when
thread,
These
buttons
and
sewing
four
lockstitch
machines
two
machines
sew a single
rows
hole
buttons.
of
designed
row
stitches
parallel
for
tack
of
stitches
to
Automotic
the
hook
tration.
Reel
threod
lockstitch.
starting
excess
270-31
up
length.
and a pneumatic
Machine
and
down
270*33
2
cross-over, 4 parallel, 4 tying.
270-37
2
cross-over, 6 parallel, 4 tying.
Button
Clamp
. . .
Rotating
revolutions
thread
cylinder,
This
machine
Machine
Machine
Sewing
accommodates
Hook
to
in
operation,
body.
Threod
Then,
without a break
Is
passed
Thus
only
ends
of
thread
is
removed
makes
each
one
and a tack,
is
fitted
starting
makes
makes
Machines
with
14
Thread
revolution
parallel
and
18
are
14
the
machine
is
wound
on
in
thread
through
one
are
from
with a tacking
clamp
Stitches ... 4
Stitches ... 6 parallel,
fitted
to
Reel
of
upper
thread
present.
reel
GENERAL
row
of 7 stitches
1/4
inch
lifting
with a Button
50
llgne
. . .
arm
shaft.
reel
or
thread
is
required
At
and
drawn
maximum
clamp
device.
parallel,
buttons.
makes
is
equipped
from
upper
interruption
loop
the
end
away
CHARACTERISTICS
two
with o sewing
thread
on
to
form a complete
of
supply
in
machine
each
successive
the
stitching
by a suction
Rotary
from
Throat
ming
stitch
Work
Feed
Safety
lifted
Belt
stop
Hook
vertical
Plate
mechanism
pattern.
Plate
Cam
. . .
Interlock
when
machine
Guard
. . .
motion
device.
reel
which
during
the
initial
cycle,
type
Shaft.
arm
. . . equipped
...
stitch
stitch
stitch
pattern,
for
controls
pattern
thread
air
pump.
. .
driven
shaft.
cutting
if
specified,
operation
. . .
prevents
is
in
operation.
fully
encloses
formation
to
with
thread
is
located
Inside
needle
pene
begins.
form a regular
and
no
stitch
is
trimmed
by
spiral
scissor
at
clamp
and
bevel
type
at
completion
odditional
of
button
from
driving
gear
trim
cost.
clamp.
being
belt
of
and
FACE
PLATE
ROTATING
WITH
REEL
TENSION
REGULATOR
THROAT
HOOK
PLATE
PRE-TENSION
BUTTON
CLAMP
PULL-OFF
LOOP
-r")®
THREAD
RING
I
i
ARM
(SIDE)
GUIDE
COVER
o
e
Other
needles,
Use
determined
by
SINGER*
size
of
233525$
needle — Catalog
thread
and
type
2173.
of
material
to
be
sewn,are
available.
LONG
SETTING
With
machine
clamping
Insert
go
making
of
the
needle
the
operator)
Securely
GROOVE'
Fig.
7.
THE
NEEDLE
screw
shown
needle
certain
faces
as
shown.
tighten
Setting
in
"stop"
in
up
into
that
the
away
needle
the
Needle
position
pig.
7.
needle
bor
single
from
clamping
NEEDLE
CLAMPING
SCREW
loosen
as
continuous
the
for
as
hook
needle
It
groove
(facing
screw.
will
Stitching
are
•
a
cause
•
Check
not
present.
Wrong
of
Bent
needle,
Troubles
needle
groove - - • a
The
correct
of
Class
270
Thread
Draw
snip
passes
thread
thread
needle
often
for
thread
breakage.
clogged
cause
of
IREADING
threading
is
shown
through
up
into
end
off
as
to
make
thread
and
needle
skipped
THEMACHII^
procedure
in
Figl
8.
needle
cutter
shown.
sure
these
material
eye
or
dirty
in
stitches.
for
eye
from
in
face
plate
defects
use - -
-
needle
Machines
front
to
and
V
^
THREAD
i "
CUTTER
v'.'T
Fig.
8.
Threading
the
Machine
c;"-"
cr
C
I
THREAD
TENSION
Needle
Thread
Tension
still
sufficient
(see
Fig.
To
regulate,
discs
as
Tension
should
to
9).
shown
set
turn
in
Fig.
be
os
the
stitch
thumb
10.
light
as
possible
correctlyin
nut
at
front
while
moteriol,
of
tension
Reel
Thread
When
adjusted,
tained
varying
10
r
■
1 INCREASE
to
needle
To
regulate,
as
required.
w'
»
Tension
tension
the
required
suit
the
on
thread
turn
DECREASE
m
reel
thread
stitch
work
tension
adjusting
in
process
only.
screw
INCREASE
may
has
been
usually
thereafter
shown
DECREASE
correctly
be
ob
by
in
Fig.
WHEN
CHECK:
Is
Is
Is
Is
Is
Fig;
THREAD
machine
needle
needle
thread
needle
correctly
bent
suitable
thread
9.
EVER.LOK
BREAKS
threaded
properly?
seated
or
burred?
for
tension
WHEN
Be
Make
Make
Do
Inspect
in
needle
in
too
tight?
OPERATING
sure
to
sure
sure
not
depress
reel
Stitch
needle
bar?
use?
depress
that
button
that
needle
clomp
thread
SEWING
HINTS
MACHINE
starting
is
thread
lifting
tension
DIFFICULTIES
FOR
pedal
firmly.
inserted
correctly
is
not
pedal
for
thread
WHEN
CHECK:
Is
needle
Is
Is
Is
Is
OPERATORS
under
until
machine
or
lint
Fig.
THREAD
needle
needle
thread
reel
in
clomp
eye
bent
size
suitable
cose
free
clamp.
at
start
SNAGS
or
or
correct
goes
accumulation.
10.
Adjusting
OR
groove
burred?
for
for
material
of
thread
of
sewing
in
"stop**.
the
MACHINE
dirty?
operation?
in
end?
cycle.
Tension
SKIPS
use?
STITCHES
I
STOP
A.
B.
C.
D.
II
KNIFE
ADJUSTMENTS
A.
B.
C.
D.
E.
III
FEED
A.
B.
C.
made
MOTION
Arm
Shaft
1.
Adjust
for
Starting
1.
2.
Engaging
1.
Tripping
1.
2.
Safety
1.
2.
3.
Tension
1.
2.
3.
Work
1.
Thread
1.
2.
Thread
1.
Feed
1.
2.
Feed
1.
2.
3.
4.
Feed
1.
2.
Lever
Set
clearance
machine
Adjust
arm
arm
Adjust
Linkage
Adjust
Set
clearance
ACTUATING
Devices
Set
Lifting
Adjust
surface
Set
Clamp
Releoser
Position
Set
lifting
Set
lifting
Clomp
Position
Wiper
Set
wiper
Position
Pull-off
Adjust
MECHANISM
Driving
Check
Eliminate
Linkage
Center
Increase
feed
bar
Center
age
Increase
ment
of
Timing
Time
longitudinal
Time
lateral
The
sequence
in
the
ADJUSTMENTS
end
ploy
between
pulley
stop
to
obtain
rock
correct
shaft
between
AND
Arm
Lug
lifting
lever
on
lifting
lifter
tension
link
arm
to
Foot
lifter
beneath
lever
stop
regulator
connection
release
Lifter
support
wiper
wire
Loop
tension
on
ADJUSTMENTS
Gears
alignment
play
of
in
gears
Adjustment
and
position
or
decrease
and
position
or
decrease
feed
bar
Adjustment
feed
of
adjustments
order
given
interlocking
"V**
belt
support
bell
crank
CLAMP
pawl
spring
timing
longitudinal
feed
movement
LIFTING
to
clear
tension
arm
hook
marks
lateral
laterol
feed
longitudinal
movement
to
avoid
arm
and
tension
for
binding
and
pawl
engaging
linkage
movement
feed
link
move
outlined
confusion
of
on
this
and
IV
V
STOP
VI
VII
VIII
IX
page
should
unnecessary
TRIPPING
A.
Set
timing
MOTION
A.
Obtain
B,
Adjust
SEWING
A,
B.
REEL
A.
B.
C.
A.
B.
C.
D.
ADJUSTMENTS
A.
B.
C.
MECHANISM
Sewing
1.
Set
2.
Time
Needle
1.
Set
WINDING
Winding
1.
Adjust
Reel
1.
Set
2.
Adjust
Pre-Tension
1.
Adjust
THREAD
ADJUSTMENTS
Finger
1.
Set
Stripper
1.
Adjust
Retracting
1.
Adjust
Tension
1.
Re-check
Reel
Trimming
1.
Set
2.
Time
3.
Adjust
Loop
1.
Position
2.
Set
repetition.
POINTS
to
BRAKE
brake
brake
Hook
longitudinal
hook
Bar
Needle
Linkage
thread
Driver
Tripping
tripping
Extension
to
STRIPPING
Plate
to
actuate
Finger
to
Finger
to
Releaser
Holder
Knives
movable
knives
knife
Pick-up
operating
loop
pick-up
be
checked
ADJUSTMENT
actuate
clearance
interlocking
ADJUSTMENTS
pressure
ADJUSTMENTS
position
Bar
Height
ADJUSTMENTS
clamping
Points
point
for
for
aid
in
reel
AND
Follower
stripper
remove
pick
UNDER
unused
up
reel
THROAT
Position
and
adjustable
pressure
Finger
lever
finger
and
action
"full
pinch"
duration
winding
RETRACTING
finger
reel
thread
Stop
arm
of
pinch
thread
PLATt
knives
#rOP
MOTION
AD.
ARM
SHAFT
CHECK:
There
arm
SETTING:
shaft
shown
should
Loosen
and
lock
nut
Pull
rear
by
turning
Then
tighten
Check
eliminated
STARTING
adjustment
without
LEVER
be a minimum
in
Fig.
set
screw
on
support
bushing
support
set
screw
screw
binding.
11.
In
bushing
out
and
to
make
of
shown
screw
shown
(toward
in
clockwise
lock
nut
securely.
sure
end
end
ploy
in
Fig.
in
Fig.
machine
pulley)
direction.
play
has
in
been
the
11
12.
HINGE
SCREW
LOCK
Fig.
NUT
11.
Stop
Motion
Adjustment
1/32
INCH
BUSHING
/
✓ i 11'I'!'!!'">
LOCK
SWIVEL
(Left
I I't'i'I
-inAj-ihrif
-SET
NUT
View)
ARM
|
SHAFT
II"
ti\
SCREW
S
\
Depress
"run"
position.
Turn
machine
from
face
into
the
"'coast"
in
Fig.
13.
At
this
1/32
inch
surface
shown
SETTING:
screw
one
quired
and
on
in
Fig.
Loosen
shown
Turn
swivel
full
turn
to
obtain
interlocking
starting
plate
position,
clearance
machine
12.
lock
in
for
lever
pulley
back)
position
there
between
pulley
nut
on
starting
Fig.
11.
on
starting
each
clearance
arm
as
to
over
until
bell
in
should
and
rod,
1/32
inch
between
shown
engage
toward
crank
bell
high
interlocking
rod
(Fig.
of
in
Fig.
machine
right
pawl
crank
be
approximately
point
of
and
remove
11)
adjustment
camming
12.
(looking
moves
as
shown
camming
arm
hinge
in
or
out
re
surface
in
as
SUPPORT
SCREW
Fig.
PAWL
POSITION
IN
12.
Stop
COAST
Motion
Adjustment
(Right
View)
COAST
RUN
POSITION
POSITION
Replace
swivel
hinge
securely.
screw
and
tighten
lock
nut
on
Fig.
13.
Bell
Crank
in
"Coost"
Position
STARTING
CHECK:
1/32
1^:-/
1NC
r
S
iL'-—'
Starting
downward
crank
when
LEVER
lever
movement
has
1/32
starting
lever
ARM
STOP
arm
stop,
of
starting
inch
clearance
is
depressed.
Fig.
lever
past
14,
should
so
that
"run**
notch
limit
bell
';iAi
SETTING:
Remove
downword
I
STARTING
Arm
Stop
BELT
1/32
INCH
^
ARM
Fig,
STOP
14.
Adjusting
1/32
INCH
the
"V"
/
Replace
ENGAGING
CHECK:
Engaging
belt
moves
]|
'I
ENGAGING
ARM
Fig.
SETTING:
**V**
movement
"V*
ARM
drops
from
15).
belt
and
turn
of
starting
belt
and
check
arm
should
approximately
"run"
position
be
adjusted
1/32
to
stop
screw
lever
arm
as
adjustment.
so
the
inch
when
"stop"
position
to
limit
required.
"V"
machine
(See
Fig.
15.
Setting
the
Engoging
Arm
PINCH
SCREW
Loosen
gaging
shown.
Tighten
NOTE:
tightness
but
MAY
machine
Tension
lowering
connection
above.
pinch
arm
closer
Check
will
CAUSE
ports.
on
motor,
with
pinch
screw,
to
or
screw
TENSION
not
improve
DAMAGE
"V**
belt
but
adjustment
engaging
Fig.
15,
farther
securely
on
"V"
from
and
BELT.
performance
or
excessive
may
be
varied
should
orm
adjustment
and
position
starting
check
Excessive
of
by
raising
be
described
en
cap
as
adjust-
machine
wear
to
or
made
in
TRIPPING
LINKAGE
CHECK:
Tripping
positioned
SETTING:
Loosen
support
Tighten
rock
to
set
as
required.
set
Fig.
17.
hold
shaft
rock
screw
screw
ROCK
SHAFT
LEVER
Lever
support,
shoft
without
shown
and
resting
in
check
Fig.
Fig.
for
binding.
on
Tripping
16,
should
binding.
16
and
position
Point
be
CHECK:
Turn
rock
shaft
Fig.
17.
At
this
of
notches
move
into
feed
cam
SETTING:
With
loosen
shown
rock
in
Using
swing
play
bell
"coast"
wrench
in
crank
Securely
machine
lever
pulley
rests
position,
in
bell
crank
"stop"
as
rock
Fig.
socket
shown
shaft
shaft
pinch
16.
wrench
when
in
lever
forward
connecting
pawl
notch
tighten
rod
approximately
in
bell
pinch
over
on
tripping
bell
crank
far
enough
actuated
Fig.
17.
resting
screw
with
as a lever,
(toword
crank
and
ALSO
screw
face
.020
as
toward
point
pawl
should
for
by
tripping
on
tripping
socket
in
plate)
to
raise
inch
shown
and
check
operator
as
until
shown
lift
out
machine
point
point,
wrench
pinch
screw,
to
remove
point
above
top
in
Fig.
16.
adjustment.
in
to
on
as
of
of
KNIFE
ACTUATING
KNIFE
Fig.
ADJUSTING
(ECCENTRIC)
18.
PIN
ROLLER
Knife
Roller
positioned
PAWL
/q
51^35=;=.ENGAGING
LIFTING
SET
CLEAR
SURFACE
ARM
SCREW
in
SHOULD
DRIVING
PINCH
INTERLOCKING
ARM
Com
SCREW
Path
LEVER
.
SAFETY
CHECK:
The
clomp
from
and
should
clomp
is
SETTING:
Engage
chine
at
Fig.
lug
extreme
18.
Loosen
lift
up
against
pulley
on
Maintain
screw
securely.
Then
is
reached
notch
on
Set
adjusting
clamp
does
in
lifting
not
inset,
DEVICES
safety
interlock
being
prevent
raised.
machine
over
outward
driving
driven
back
of
this
rotate
machine
just
pulley
("stop"
lever
engage
Fig.
19.
should
lifted
when
machine
machine
in
toward
position
lever
arm
bell
from
"run"
right
on
pinch
with
screwdriver
crank
position
pulley
before
interlocking
position).
pin
(eccentric),
arm,
so
that
driven
orm
and
prevent
is
starting
position
until
feed
cam
screw.
as
shown.
while
tightening
again
while
pawl
slides
the
work
in
operotion
when
work
and
turn
knife
roller
as
shown
Fig.
19
to
bring
lifting
until
the
arm
drops
depressing
on
lifting
by
as
shown
ma
is
in
and
pinch
point
into
arm
LIFT
DRIVEN
Fig.
vmjiimuim
BELL
CRANK
UP
ON
ARM
19.
Adjusting
the
Safety
NOTCH
Then
rotate
"stop"
shown
stop
ment
lever
machines
position
in
should
of
lever
rock
goes
Fig.
machine
Fig.
20
be
set
arm
shaft
into
20.
Setting
end
by
to
and
thereby
when
"stop"
pulley
adjust
means
limit
extreme
clamp
position.
ADJUSTING
CLAMP
STOP
the
Clamp
to
bring
the
clamp
of
adjusting
avoid
binding
lifter
is
NUTS
LIFTER
Lifter
machine
lifter
nuts.
downward
of
storting
activated
before
Stop
into
stop
The
move
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