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Singer 451k51 Troubleshooting guide

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Form
K6518
(1266)
SERVICE
MANUAL
PARTS
LIST
SINGER
451k51
HIGH
SPEED
LOCK
STITCH
SINGLE
NEEDLE
VERTICAL
TRIMMER
MACHINE
Machine
451K51
THE
SINGER
COMPANY
Copyright Under International Copyright Union
•A
Trademork
of
THE
SINGER
COMPANY
Printed
In
Greot
Britain
From the library of: Superior Sewing Machine & Supply LLC
CONTENTS
Page
DESCRIPTION 3
SETTING
UP
4
LUBRICATION 5. 6
INFORMATION
FOR
OPERATOR
7-14
Page
TIMING
AND
ADJUSTING
15-22
REMOVAL
AND
REPLACEMENT
OF
PRINCIPAL
ASSEMBLIES
23-26
PARTS
CHART
28,
29
PARTS
LIST
30,31
INDEX
Alignment
Arm
Shaft
with
Hook
Driving
Shaft
Arm
Shaft
15i
25,
26
Arm
Shaft
Connection
Belt
3,
25
Arm
Shaft
Connection
Belt
Pulley
25,
26
Automatic
Lubrication
6
Ball Bearings and Needle Bearings 15, 25, 26
Bobbin
7
Bobbin
Case
8-10,14
Bobbin
Case
Holder
16,
18,
23
Bobbin
Case
Holder
Needle
Guard
16,
18
Bobbin
Case
Slide
Bobbin
Thread
7,
9
Bobbin
Thread
Tension
10
Bobbin
Winder
5» 8
Broken
Thread
7,
12
Carefree Operation Hints 14
Centralisation
of
Feed
Dog
21
Change of Stitch Length
11,22
Check-Spring
18, 19
Cleaning
5, 12, 20, 24
Connection
Belt,
Arm
Shaft
3, 25
Common
Causes
of
Stitching
Troubles
7
Cover
Guard
(Take-up)
12, 16
Daily Care 5
Damaged
Needles 7
Damaged
Parts
14
Dimensions
of
Machine
3
Drawing
Up Bobbin
Thread
9
Drip
Pan,
Installation
4
Face
Plate,
Removal
and
Replacement
19
Feed
Dog
15, 21, 22
Feed
Driving
Eccentric
Gib
22
Feed
Driving
and
Reversing
Mechanism
22
Feed
Driving
Eccentric
22
Feed
Driving
Eccentric
Adjusting
Disc
22
Feed
Mechanism
(Pendant
Link)
3,
16,
21,
22
Feed
Movement,
Description
21
Feed
Reversing
Lever
Stop
Pin
22
Formation
of
Stitch
10
Fraying
of
Material
7
Gib
(Feed
Driving
Eccentric)
22
Hints
for
Carefree
Operation
14
Hook
Clearance
to
Needle
17
Description
3
Lubrication
6
Removal
and
Replacement
23
Stringing
•
18
Timing
17
Hook
Driving
Shaft
15,
25
Hook
Oil
Shield,
Installation
6
Hook
Oil
Wick
6
Hook
Section
23
Knee
Lifter
3,
4,
14
Knee
Lifter
Rod
Spring
22
Knives
Aligning
Upper
Knife
to
Lower
Knife
13
Eliminating
Side
Movement
of
Knife
(Upper)
Holder
Bracket
13
Replacing
Knives
14
Setting,
Lower
and
Upper
Knives
to
Correct
Height
13
Length
of
Stitch
3,
11,
22
Light
Fixture
Mounting
Seat
3
Page
15
Page
Locking
Feed
Driving
Eccentric
22
Loop
Lift
15
Machine
Pulley
3,
5,
14,
25
Machine
Rest
Pin
4,
14
Machine
Storage
5
Needle
7
Needle
Bar
and
Bushing
15-17,
26
Needle
Bar
Connection
Link
26
Needle
Bar
to
Presser
Foot,
Clearance
and
Alignment
20
Needle
Bearings
3,
15
Needle
Beakage,
Prevention
7,
14,
18
Needle
to
Hook
Clearance
17
Needle
Guard
16,
18
Needle
Threading
7
Needle
Thread
Tension
10, 18,
19
Needle
Thread
Tension
Releaser
10,
20
Oil
Reservoir
3,
5,
25
Oil
Shield
(Hook)
6
Oil
Wick
(
Hook)
6
Pendant
Link
Feed
Mechanism
3
Perfect
Stitch
10
Position
Finger
6, 17
Preliminary
Inspection
15
Preparation
for
Sewing
9
Presser
Bar
and
Bushing
20
Presser
Foot
11, 14,
15,
19,
20
Pressure
of
Presser
Foot
11,22
Prevention
of
Unauthorised
Change
of
Stitch
Length
22
Puckering
21
Pulley
(Arm
Shaft
Connection Belt) 25, 26
Pulley,
Machine
- 3, 5, 14, 25
Removing
Broken
Thread
12
Rest
Pin
4,
14
Reverse
Feed
3,
11, 19,
22
Reversing
Lever Stop Pin 22
Rock
Shafts
24
Rotary
Take-up
(See
"Take-up")
Sewing
Hook
(See
"Hook")
Speed 3,
14
Setting
the
Needle 7
Specifications
15
Spillage
of
Bobbin
Thread
8
Starting
to Sew 12
Stitch
Formation
10
Stitch Length 3, 11, 22
Stitch
Regulator
8, 11
Stitching
Troubles,
Causes 7
Stringing
the
Needle
Guard
(Hook)
18
Superfmish
14
Tacking
3,
11,19
Take-up.... 3,
15,
19
Take-up
Cover
Guard
12,.
16
Tension
Devices
3
Tension Releaser (Needle Thread) 20
Threading
7, 9
Thread
Beakage
7, 12
Thread
Cutters
3,
12
Thread
Tensions
10,
19
Trimmer
Adjusting
12
Changing
Trimming
Margin
12
Disengaging
12
Turning
a
Corner
12
V-Belt
3
Wearing
Checks
6,
15,
20,
21
Winding
the
Bobbin 8
From the library of: Superior Sewing Machine & Supply LLC
DESCRIPTION
Machine
451
K51,
for
stitching
and
trimming
light
and
medium
weight
fabrics.
Lock
stitch
(Stitch
Type
#301)
Single
needle,
Catalogue
1361
(88x9)
Socket-type
needle
bar
Short
arm,
flat
bed
Drop
feed.
Pendant
link
feeding
mechanism
with
reinforced
feed
bar
insures
level
feed
motion
and
uniform
stitch
length
at
all
speeds.
•
Reverse
feed,
hand
operated,
with
spring
return
to
forward
stitch.
Performs
precise
tack
ing
and
strong
seam
reinforcing
with
minimum
thread
breakage.
•
Maximum
stitch
length,
6
to
the
inch
forward
and
7
to
the
inch
in
reverse.
Vertical
Trimmer.
Trims
1/8
to
5/16
inch
to
the
right
of
seam
as
desired.
Special
fittings
for
trimming
3/32
inch
from
the
line
of
stitching
can
be
furnished
if
specified
on
order.
Unless
otherwise
ordered
machine
will be
fitted
to
trim
1/8
inch
to
right
of
seam.
The
upper
knife
may
be
thrown
out
of
action
at
will
for
straight
stitching.
Upper
knife
stroke
9/64
inch.
Modified,
single
rotary
take-up
maintains
constant
thread
control
to
meet
hook
require
ments.
Easy
to
thread.
Simple
to
adjust.
Long
point
rotary
sewing
hook
on
horizontal
axis
(belt
driven);
automatic
lubrication
can
be
regulated.
One
oil
reservoir
and
three
easily
accessible
oil
holes
serve
all
principal
bearings
in
machine.
Rotary
tension
and
pre-tension
devices
achieve
precise
thread
control
throughout
speed
range
of
stitching
with
all
types
of
natural
and
synthetic
threads
and
materials
of
light
and
medium
weight—permitting
lightest
tensions
for
perfect
"wash
and
wear"
sewing.
Tension
guard,
mounted
on
face
plate,
protects
rotary
tension
from
broken
threads,
lint
and
other
hazards.
Two
thread
cutters;
One,
on
face
plate,
pre
vents
wrapping
of
broken
thread
around
rotary
take-up.
The
other,
on
rear
of
thread
guard,
removes
excess
broken
thread
from
take-up.
Durable,
steel
-
reinforced,
rubber
driving
belt
270926,
from
arm
shaft
to
hook
driving
shaft,
is
readily
accessible
when
rear
arm
cover
is
re
moved.
Large
rim,
aluminium
machine
pulley
276445,
for
3/8
inch
V-belt,
is
designed
for
safety.
Out
side
diameter
of
belt
groove,
2.9
inches.
Effective
diameter
for
5/16
inch
round
leather
belt,
2-3/8
inches.
Tapped hole and seat in rear of
arm
provided
for
mounting
a
light
fixture.
Compact stitch length mechanism is easy to
read
and
to
set.
Enclosed
knee
lifter
rod
and
connection
to
knee
lifter
228710.
Needle
bar
stroke, 1-9/64 (1.140) inches.
Presser
bar
lift
(capacity
of
machine),
9/32
(.281)
inch.
Bed dirnensions: Length, 15-11/16 inches.
Width 7 inches. Working space
at
right of
needle,
8
inches.
Double
shielded ball
bearings
at
both
ends
of
arm
shaft
and
at
pulley
end
of
hook
driving
shaft.
Needle
bearings
for
feed
driving
and
feed
lifting
connections
and
for
needle
bar
connecting
link.
Nylon
insert
bearings
for
feed
driving
rock
shaft
and
feed
lifting
rock
shaft.
Controlled
pressure
lubricated
bearings
on
hook
shaft.
TOP
OF
MACHINE
PULLEY
TURNS
OVER
FROM
THE
OPERATOR.
CAUTION
Do
not
start
machine
until
it
has
been
thor
oughly
oiled,
as
instructed
on
pages
4, 5
and
6.
SPEED
Maximum
speed
recommended
is
5000
stitches
per
minute,
with
these
exceptions
. . .
•
Run
a
new
machine
at
a
more
moderate
speed
the
first
few
days.
• A
machine
that
has
been
idle,
for
a
long
period
of
time,
should
be
run
slower
than
maxi
mum
speed
for
the
first
few
minutes
to
allow
time
for
oil
to
reach
the
moving
parts.
Check
principal
bearing
points
for
freedom
of
move
ment
and
adequate
lubrication
before
running
machine
at
top
speed.
•
Reduce
speed
of
machine
when
sewing
closeiy
woven
or
treated
material.
Maximum
efficient
speed
is
dependent
upon
,
the
nature
of
the
operation,
the
ability
of
the
operator
and
the
type
of
thread
and
material
in
use.
Never
force
machine
beyond
its
maximum
efficient
speed
for
the
work
being
accomplished.
Disregard
of
this
precaution
could
result
in
con
siderable
damage
to
machine.
From the library of: Superior Sewing Machine & Supply LLC
SETTING
UP
DRIP
PAN
Position
drip
pan
on
underside
of
table,
as
shown
in Fig. 2,
with
its
right
end
even
with
right
inside
edge
of
machine
cut-out
in
table.
Using
four
3/4
inch
wire
nails,
fasten
drip
pan
low
enough
in
table
cut-out
to
avoid
interference
with
rock
lever
rod
(shown
in Fig. 2).
KNEE
LIFTER
Using
three
7/8
inch
wood
screws
(shown
at
1,
Fig. 2)
fasten
rock
lever
bracket
2 to
underside
of
table.
Locate
bracket
2
so
that
rock
lever
rod
can
rise
and
fall
through
hole
provided
for
it in
drip
pan
with
out
striking
edge
of
hole.
Locate
rock
lever
extension
3
to
hold
rock
lever
rod
equidistant
from front
and
rear
edges
of hole in drip
pan.
Make
certain
that
platform
at
top
end
of rod
will
be
directly
under
knee
lifting
rod
A,
^g. 5, page 5,
in
machine;
then
securely
tighten
clamp
screw
4.
Raise rock
lever
rod
5 to
bring
Its
platform
just
below
knee
lifting
rod
in
machine,
when
at
rest.
Make
certoin platform is
turned
as
shown
in Fig. 2
and
se
curely
tighten
clamping
screw
6.
Knee
plate
7
may
be raised, lowered or
turned
to
suit
the
requirements
of
the
operator,
after
loosening
clamping
screw
8. Knee
plate
arm
9
may
also
be
moved toward the left or right
and
toward front or
rear,
as
required
after
loosening
clamping
screw
10.
Tighten both screws 8
and
10 securely
when
correct
position is
obtained.
Set
stop
stud
11 to
stop
the
action
of
the
knee
lifter
as
soon
as
knee
lifter
raises
presser
foot
high
enough
to
trip
hand
lifter on
machine.
Securely
tighten
clamp
ing
screw
12.
MACHINE
HEAD
Machine
head
should
rest
upon
cushioning
pads
in
four
corners
of
cut-out
in
table.
Machine
is
not
fas
tened.
Machine
hinges
must
not
be
required
to
support
head
except
when
machine is tilted back
upon
ma
chine
rest
pin
on
table.
BELT
GUARD
NOTE:
Belt
Guard
106505
is
supplied
with
the
machine
only
when
requested
on
order.
Remove
arm
side
cover
screw
and
fit
belt
guard
bracket
1,
Fig.
3
with
long
hinge
screw
2.
Insert
belt
guard
support
3,
Into
bracket
1,
and
belt
guard
4,
as
illustrated.
Adjust
belt
guard
so
that
It
just
clears
the
machine
pulley,
then
tighten
the
Allen
screws
in
the
bracket
and
belt
guard
with
the
special
key.
FRONT
EDGE
OF
TABLE
PLATFORM
ROCK LEVER
ROD—
Fig. 2.
Drip
Pan
and
Kne« Lifter
beneath
the
Table
•>;
Fig.
3.
Belt
Guard
In
Position
I ^
'f I
i# ;
From the library of: Superior Sewing Machine & Supply LLC
OIL
FILL
OIL
reservoir:
OIL
SHOULD
SHOW
AT
HIGH
MARK
—
DIRECTION
OF
ROTATION
NEVER
AlToW
oil
O FALL BELOW
LOW
MARK
ON*
GAUGE
OIL
OIL
Fig. 4. Oil Reservoir
and
other
Oiling
Points
on
Machine
Fig. 5. Priming Points
beneath
Machine
Bed
Fig. 6. Bobbin Winder Lubrication
MACHINE
PULLEY
When
machine
Is In
operation,
machine
pulley
always
must
turn
over
away
from
the
operator,
as
shown
in
Fig.
4.
CAUTION:
Do
not
start
the
machine,
not
even
to
test
the
speed,
until
it
has
been
thoroughly
oiled
as
instructed
below.
LUBRICATION
AND
CLEANING
Use
SINGER*
OIL
'TYPE
A"
or
"TYPE
C".
See
inside
front cover of this book for description of these oils.
Keep
machine
clean
end
well
oiled
at
oil times.
OIL
RESERVOIR
Fill
by lifting out oil
gouge
and
applying oil to hole
in machine bed,
as
instructed in Fig. 4. Reservoir
sup
plies oil to
sewing
hook race, to eccentrics
and
to
front bushing on hook driving shaft.
DAILY
CARE
Apply
a
few
drops.of
oil
to
the
four
oil
holes
shown
In
Fig.
4.
Check oil level in reservoir
before
starting machine.
Add oil, when necessary to maintain level
at
HIGH
mark. Never allow oil level to
drop
below lower
mark
on
gauge.
Occasionally
remove
the
cover
for
the
trimmer
driving
crank
and
apply
oil to
the
oiling
points
shown
in
the
insert
Fig.
4.
Always
clean
the
cover
before
replacing
it.
AFTER
INSTALLATION
New
machines
and
machines
installed
after
several
weeks of idleness should be primed before using.
Residual lubricant
may
have
congealed or
disappeared
entirely.
Apply a few
drops
of oil to priming points shown
in Fig.
5,
beneath
machine
bed.
Oil
hook
assembly
by
hand.
Check
oil
flow
and
adjust
when
necessary,
as
instructed
below
and
on
page
6.
Proceed
with
"DAILY
CARE"
as
instructed
above.
BOBBIN
WINDER
Apply a
few
drops of oil daily,
or
more often
when
necessary,
to oil wick in
bobbin
winder
frame
as
in
dicated
in Fig. 6.
CLEANING
Remove
all
lint
and
abrasive
matter
from
around
hook
and
from
between
feed
rows
on
underside
of
throat
plate.
Remove
dirt
from
clean-out
hole C, Fig. 4 in
needle
bar, pushing shank of a needle through hole. Wipe
off all excess oil from
areas
of machine that may
come
in
contact
with
material
to
be
sewn.
Machines not in use should be kept well oiled, clean,
dry
and
covered.
From the library of: Superior Sewing Machine & Supply LLC
HOOK
LUBRICATION
Rotary
sewing
hook
Is
automatically
lubri
cated.
Flow
of
oil is
regulated
by
turning
screw
N.
Fig.
9,
as
instructed
below.
HOOK
LUBRICATION
TEST
AND
ADJUSTMENT
Thread machine,
as
instructed on
pages
7
and
9.
Sew
about
three
yards
of
scrap
material.
Remove
material.
Pay
no
attention
at
this
time
to
stitching
quality
or
amount
of oil
spray.
Remove
bed
slide
E, Fig. 8.
Run
machine
for
approximately
one
minute
to es
tablish
auniform
rate
of
flow.
Without
stopping
ma
chine, hold a piece of white
paper
underneath
hook
for 15
seconds
without
moving
paper
during
interval.
Remove
paper
and
inspect:
There
should
be o
pot-
tern of
three
sprays
(two light lines on outside
and
one
heavier,-wider
line
in
centre)
as
shown
in Fig.
7.
If
there
is
no
trace
of
oil
or
on
excess
of
oil
on
test
paper
Remove
needle,
bobbin
and
bobbin
case
from
ma
chine.
Remove screw R
and
position
finger
S, Fig. 8. Loosen
two
screws
D
and
remove
sewing
hook
B, Fig. 8
from
hook
driving
shaft,
as
instructed
on
page
23.
Loosen
filter
screw
O,
Fig. 9
and
check
oil
wick
com
plete
276062
(see Fig. 9.) Oil wick
should
be
replaced
whenever
it has become clogged by lint or dirt from oil.
An
excess
of
oil
sometimes
indicates
that
oil
wick
202423
has
become
detached
from
filter
screw
O, Fig. 9
or
that
filter
screw
is
not
securely
tightened.
Repair
or
replace
as
required.
Inspect all oil
passages
in
shaft
and
bushing
to
see
that
they
have
not
become
clogged
with
lint
or
dirt.
Just
plain
dirt
can
prevent
oil
from
reaching
its
objective.
The
hook
shaft
bushing
K, Fig. 9
contains
the
regu
lating
screw
N, Fig. 9
for
controlling
the
oil
flow.
Turning
in
screw
N,
increases
amount
of oil
sup
plied to hook,
as
indicated by
arrow
and
word
"MORE" on
end
of
bushing.
Backing screw N out,
decreases
amount
supplied,
as
indicated
by
arrow
and
word
"LESS
".
Normal
adjustment
is
accomplished
by
turning
screw
N in ail
the
way,
then
backing
it
out
again
about
2-1/2
turns. Less
than
2-1/2
turns
may
be
required
if
continuous
runs
are
being
made
or
material
with
considerable
sizing
is
being
stitched.
To
test
oil
flow
while
hook
is
removed
from
ma
chine, hold test
paper
under
end
of hook
shaft
(with
machine
running
at
full
speed)
for
15 seconds. Oil
streak
should
then
be
about
1/16
inch
wide.
When correct flow is
obtained,
replace
sewing hook
and
position-finger, as instructed on
poge
23.
Make
certain oil shield U is In place
as
shown in
Fig. 9. It is
provided
to
prevent
excess oil
from
reach
ing
underside
of
throat
plate.
Re-test
oil
flow
as
instructed
above.
When
hook
lubrication
is
satisfactory,
replace
all
parts
removed
earlier.
Fig. 7.
Approximate
Sproy
Pattern
Fig. 8. Rotary
Sewing
Hook
OILWICK
202423
Fig. 9
Adji/sting
Oil
Flow
to
Hook
L
I;
MOVE
TO
.
HIGHEST
POINT
LOOSEN
"
SCREW
INSERT
NEEDLE
%
UP
AS
FAR
AS
POSSIBLE
AND
TIGHTEN
SCREW
I
^LONG
GROOVE
o\ycy-
Fig. 10.
Setting
Needle
From the library of: Superior Sewing Machine & Supply LLC
Use SINGER* needles, Catalogue
1361
(88x9)
made
in a
variety
of
sizes.
These needles have a nickel finish but may be
supplied
with
chromium
finish
when
so
ordered.
Chrome
plating
of
sizes
9
and
smaller
is
not
recommended.
ORDERS FOR NEEDLES should specify
Quantity required,
Size
number and Catalogue
number.
Examples
...
"100
Size 16, Catalogue
1361
(88x9) Needles"
Sizeof the needle to be used
should
be determined
by
type
of
material
being
sewn
and
by
size
of
thread
which
must
pass
freely
through
the
eye
of
needle.
HOLD THIS END
ROLL
OVER
TOWARD
YOU
Fig,
t1.
How to Detormine Thread Twist
TO
SET THE NEEDLE
Turn machine pulley over away from you until
needle
bar
is
at
its
highest
point,
as
shown
in
Fig.
10,
page
6.
Loosen
needle
clamping
screw. Remove old
needle
and insert new needle up into needle
bar
as far as
it will
go.
Make certain
that
single continuous groove
of
needle faces
away
from hook
(toward
the
left end
of machine, as shown in Fig. 10, page 6) with eye
of
needle
directly
in
line
with
arm
of
machine.
Securely tighten clamping screw.
CHECK
NEEDLE
OFTEN
TO
MAKE
SURE
THESE
DEFECTS
ARE
NOT
PRESENT . . .
•
Wrong
needle
for
thread
and
material
in use—
a
cause
of
threod
breakage.
•
Bent
needle, clogged needle eye or dirty needle
groove—causes
of
skipped
stitches.
•
Hook
or burr on
needle
point—cause
of
picking
or
fraying
of
material.
•Incorrect
setting
of needle—a
cause
of
needle
breakage.
THREAD
Left
twist
thread
should
be
used
in
needle.
Either
right
or
left
twist
thread
can
be
used
in
bobbin.
Hold
thread
as
shown in Fig. 11. Twirl
thread
over
toward you between thumb and forefinger of right
hand; if left
twist,
strands
will
wind tighter; if right
twist, strands will unwind or separate.
Rough
or uneven thread, or thread which passes
with difficulty through the eye of the needle, will
interfere
with
successful
use
of
machine.
m
WRAP
THREAD
l'/2
TURNS
AROUND
DISC
UPPER
THREADING
Turn machine pulley
away
from
you until
needle
is
at
its highest
position.
Pass
thread
from
unwinder,
through
threading
points
#1
through
#12
in
order
shown
in
Fig.
12.
When
you
have
become
accus
tomed
to
threading
this
machine,
thread
can
be
passed
from
thread
ing
point
#4
to
needle
with
a
single
continuous
motion.
MOVE
TO
HIGHEST
POINT
Threading
the
Needle
7 5
to
/
\\
to
(Yi
Fig. 12. Upper Threading Completed
Thread
needle
from
left to
right.
Leave
about
three
inches
of
thread
behind
the
presser
foot,
as
shown
in
Fig.
12
with
which
to
start
sewing.
From the library of: Superior Sewing Machine & Supply LLC
TO
REMOVE
BOBBIN
Turn
machine
pulley
over
away
from
you
until
needle
moves
up
to
Its
highest
point,
as
shown
in
Fig.
12,
Page
7.
Reach
beneath
bed
of
machine
with
left
hand
and
remove
bobbin
case
from sewing hook,
as
instructed
in Fig.
13.
While latch is kept open, bobbin will be retained
in
bobbin
case.
To
remove
bobbin
from
bobbin
case,
release
latch
and turn open end of bobbin case downward. Bobbin
will
drop
out,
as
shown
in Fig.
14.
TO
INSTALL
BOBBIN
WINDER
Bobbin
winder
should
be
fastened
to
table
with its driving pulley
approximately
1/4
inch
in
front
of
machine
belt,
as
shown
in Fig.
15.
Pulley will then
make
firm contact with ma
chine
belt
when
thumb
latch is
pressed
down.
Pulley will be releosed from contact with belt
when
sufficient
thread
has
been
wound
upon
bobbin.
PRESS
W/
DOWN
TO
pushPs
PULLEY
i Ib
AGAINST
BELT
START^«s^
MACHINE
n
TO
WIND
BOBBIN
Place
bobbin
on
spindle,
pushing
it on
as
far
as
it
will go
and
pass
thread
through
threading
points,
as
shown
above.
Wind
end
of
thread
around
bobbin
a
few
times
in
direction
shown
in Fig. 15.
Press
down
on
thumb
latch,
pushing
driving
pulley
against
belt,
as
shown
in
Fig.
15.
Start
machine.
Bobbin
can
be
wound
while
machine
is
stitching.
TO
AVOID
SPILLAGE:
Regulate
bobbin
winder
to
stop
automatically
when
bobbin
is
wound
approxi
mately
1/16
inch
short
of
bobbin
rim.
V-j1l\
rr6
m)
Fig. 13. Removing Bobbin Case
from
Sewing
Hook
ml
3.
RELEASE
LATCH
4.BOBBIN
DROPS
OUT
Fig. 14. Removing Bobbin from
Case
1.
PLACE
BOBBIN
TENSION
ON SPINDLE CONTROL
\
AS
FAR
AS—
IT
WILL
GO
^.=^2.
WIND
THREAD
note::tTghten
around
bobbin
FOR MORE THREAD _
ON
BOBBIN
Fig. 15. Winding Bobbin
Fig. 16. Plocing Bobbin
in
Bobbin
Cot*
From the library of: Superior Sewing Machine & Supply LLC
3.TURN
BOBBIN
CASE
OVER
AND
DRAW
THREAD
UP
INTO
DELIVERY
^
EYE
, _
HRFAirv.Al^
DRAW
THREADTN
DOWN
AND
I
UNDER
SPRlN0^
U \\
THREAD
[
INTO
/^SLOT
1(2
Fig. 17. Pulling Thrsod
into
the
Slot
K'T^dlDING
LAt(
gplPL-ACt^BO'BfflT
Fig. 18. Drawing Thread
Under
Tension
Spring
An
LATCH
C3.
PRE®
-BAOTV,
UNTlt;
LAtCW
{ )
^CATCHES
GRO^VE^^
IN
STUD
^ i
Fig. 19. Bobbin Cat* Threadod
and
Replaced
Fig. 20.
Drawing
Up Bobbin Thread
TO
THREAD
BOBBIN
CASE
Hold
bobbin
so
that
thread
will
unwind
in
the
direction
shown
In Fig.
16,
Page
8.
Hold
bobbin
case
as
shown
In
Fig.
16,
Page
8
and
place
bobbin
Into
it.
Pull
thread
into slot 1, Fig. 17
and
under
tension
spring
2,
Fig.
17.
Draw
thread
into delivery
eye
at
end
of
tension
spring,
as
shown
at
3,
Fig.
18.
TO
REPLACE
BOBBIN
CASE
1. After
threading
bobbin
case,
grasp
latch
between
thumb
and
first
finger
of
left
hand
and
place
bobbin
case
on
centre
stud
of
bobbin
case
holder,
as
shown
in Fig.
19.
2.
Release
latch.
3. Press
bobbin
case
back
until latch
catches
groove
near
end
of
stud.
Allow
about
three
inches
of
thread
to
hang
free.
TO
PREPARE
FOR
SEWING
(See Fig.
20)
• Hold slack
end
of
needle
thread
loosely
and
turn
machine pulley
over
away
from you until
needle
moves
down
and
up
again
to Its
highest
point,
catch
ing
bobbin
thread.
•
Draw
up
needle
thread;
bobbin
thread
will
come
up with it through hole in throat plate, as shown in
Fig.
20.
o Lay
both
threads
back
under
presser
foot.
0
Close
bed
slide.
Alwoys
keep
bed
slide
closed
when
machine
is in
operation.
From the library of: Superior Sewing Machine & Supply LLC
THREAD
TENSION
For ordinary stitching, tension on needle
and
bobbin
threads
should
be
balanced
with
needle
and
bobbin
threads
locked
in
centre
of
thickness
of
material
as
shown
in Fig.
21.
When
there
is
too
much
tension
on
needle
thread
or
not
enough
on
bobbin
thread,
needle
thread
can
not be pulled
down
into
material,
as
required.
Poor
stitching results.
Needle
thread
lies on
top
of
material
as
shown
in Fig.
22.
When
there
is
too
much
tension
on
bobbin
thread
and
not
enough
on
needle
thread,
you
get
the
reverse
of
the
condition
shown
in Fig.
22.
The stitching is just
as
poor. Bobbin
thread
lies on bottom of
material
as
shown
in Fig.
23.
NEEDLE THREAD TENSION
SEHING
FOR GENERAL PURPOSES
When
machines
leave
the
factory,
the
needle
thread
ten-
sjon
thumb
nut
is
set
to
a
position
for
sewing
most
light
and
medium
threads
without
adjustment.
Should
this
setting
be
lost,
the
minimum
tension
at
which
the
rtiachine
will
sew
a
medium
thread
should
be
established.
At
this
setting
a
variety
of
threads
can
be
sewn.
TO
REGULATE
BOBBIN
THREAD
TENSION
For
average
sewing,
tension
on
bobbin
thread
should
be
very light.
To
regulate
tension
on
bobbin
thread,
remove
bob
bin case
and
turn screw in tension spring,
as
instructed
in Fig.
24.
When
once
the
tension
on
bobbin
thread
has
been
correctly
adjusted
for
ordinary
stitching, required
stitch
can
usually be
obtained
thereafter
to suit
the
work in process by varying tension on needle
thread
only.
TO
REGULATE
NEEDLE
THREAD
TENSION
Before the initial needle
thread
tension adjustment,
obtain
the
correct
tension
on
bobbin
thread,
as
in
structed
above.
Tension on needle
thread
should be just
enough
to
set
stitch correctly in
material.
Regulate needle thread tension only when presser
foot is down. Needle thread tension is automatically
released
when
presser foot is raised.
Having lowered presser foot, turn thumb nut
at
front of tension discs,
as
instructed in Fig. 25.
PRE-TENSION
SEHING
The
purpose
of
this
tension
Is
to
ensure
that
the
needle
thread
grips
the
rotary
tension
wheel.
InsulTicientpre-tension
will
causeloopingorthread
break
age
with
heavy
materials
and
thread.
Excessive
pre-tension
will
make
It
Impossible
to
get
a
sufficiently
light
needle
thread
tension
when
using
very
light
threads.
10
£30929
Fig. 21.
Perfect
Stitch
Fig. 22. Needle Thread Tension
Too Tight
Fig. 23. Needle
Thread
Tension
Too
Loose
£30930
£30922.
Fig. 24. Regulating Bobbin
Thread
Tension
MORE
TENSION
LESS
TENSK>N
Fig. 25. Regulating
Needle
Thread
Tension
1=309^
From the library of: Superior Sewing Machine & Supply LLC