Singer 451K51 Service Manual

Form

(1266)

K6518

HIGH

LOCK

SERVICE

PARTS

SINGER

451k51

SPEED

STITCH

MANUAL

LIST

SINGLE

VERTICAL

TRIMMER

NEEDLE

MACHINE

Machine

451K51

•A

TrademorkofTHE

SINGER

THE

COMPANY

SINGER

Copyright Under International Copyright Union

COMPANY

PrintedInGreot

Britain

CONTENTS

Page

DESCRIPTION 3

SETTING

LUBRICATION 5. 6

INFORMATION

Alignment

Arm

Arm Arm Arm

Automatic

Ball Bearings and Needle Bearings 15, 25, 26

Bobbin Bobbin

Bobbin

Bobbin Bobbin Bobbin

Broken

Carefree Operation Hints 14

Centralisation

Change of Stitch Length

Check-Spring Cleaning

Connection

Common

Cover

UP

FOR

Shaft

with

Shaft Shaft

Connection

Shaft

Connection

Lubrication

Case

Holder

Case

Holder

Case

Slide

Thread Thread

Winder Thread

Tension

of

Belt,

CausesofStitching

Guard

(Take-up)

OPERATOR

Hook

Needle

Feed

Arm

Driving

Belt Belt

Dog

Shaft

Pulley

Guard

Troubles

Shaft

7-14

Page

15i

25,

3,

25,

8-10,14

16,

18,

16,

7, 5» 8

7,

11,22

18, 19

5, 12, 20, 24

3, 25

12, 16 Daily Care 5 Damaged

Damaged

Dimensions

Drawing

Drip

Face

Feed

Feed Feed

Feed

Formation

Fraying Gib

Hints

Hook

Clearance

Description

Lubrication

Removal

Stringing

Timing

Hook

Knee

Knives

Aligning

Eliminating

Replacing

Setting,

Length

Light

Needles 7

Parts

of

Machine

Up Bobbin

Pan,

Plate,

Dog

Driving

Driving Driving

Driving

Mechanism

Movement,

Reversing

of

(Feed

Driving

for

Carefree

Driving

Oil

Shield,

Oil

Wick

Section

Lifter

Holder

Lower

Correct

of

Stitch

Fixture

Installation

Removal

of

Material

to

and

•

Rod

Upper

Bracket

Knives

Height

Thread

Eccentric

and

Reversing

Eccentric

(Pendant

Description

Lever

Stitch

Eccentric)

Operation

Needle

Replacement

Shaft

Installation

Spring

KnifetoLower

Side

Movement

and

Mounting

and

Gib

Adjusting

Stop

Upper

Seat

Replacement

Mechanism

Disc

Link)

Knife

of

Knife

Knives

(Upper)

to

15, 21, 22

3,

16,

3,

21,

15,

3,4,14

11,

4

INDEX

15

26 25 26

6 7

23

18

9

10

12

21

7

14

3

9

4

19

22

22 22

22

21

22

10

7

22

14

17

3

6

23

18

17 25

6

23

22

13

14

13 22

3

Page

TIMING

REMOVAL

PARTS PARTS

Locking

Loop

Machine

Needle

Needle Needle

Needle

Needle Oil

Oil Oil

Pendant

Perfect

Position

Preliminary Preparation

Presser Presser

Pressure

Prevention

AND

PRINCIPAL

CHART LIST

Feed

Lift

Pulley

Rest

Storage

Bar

Alignment

Bearings Beakage,

to

Hook

Guard

Threading

Thread

Reservoir

Shield

Wick(Hook)

Link

Stitch

Finger

Bar Foot

of

Stitch

Length

ADJUSTING

AND

ASSEMBLIES

Driving

and

Connection

to

Presser

Tension

(Hook)

Feed

Inspection

for

Sewing

and

Presser

of

Unauthorised

REPLACEMENT

Eccentric

Bushing

Link

Foot,

Prevention

Clearance

Releaser

Mechanism

Bushing

Foot

Clearance

Change

OF

of

and

11, 14,

15-22

23-26

28, 30,31

3,5,14,

15-17,

7,

14,

16,

10, 18,

10,

3,5,25

15,

19,

11,22

Page

4,

3,

6, 17

Puckering

(Arm

Shaft

Pulley

Pulley,

Removing

Rest

Reverse

Reversing

Rock

Shafts

Rotary

Sewing

Machine

Broken

Feed

Lever Stop Pin 22

Take-up

Hook

Connection Belt) 25, 26

Thread

(See

"Take-up")

"Hook")

- 3, 5, 14, 25

3,

4,

11, 19,

Speed 3,

Setting

Specifications

SpillageofBobbin

Starting

Stitch

the

Needle 7

Thread

to Sew 12

Formation

Stitch Length 3, 11, 22 Stitch

Regulator Stitching Stringing

Troubles,

the

Needle

Causes 7

Guard

(Hook)

8, 11

Superfmish Tacking

Take-up.... 3,

Take-up

Tension

Cover

Devices

Guard

3,

11,19

15,

12,.

Tension Releaser (Needle Thread) 20

Threading Thread

Thread

Trimmer

Beakage

Cutters

Tensions

7, 12

3,

10,

Adjusting

Changing

Trimming

Margin

Disengaging

TurningaCorner

V-Belt

Wearing

Winding

Checks

the

Bobbin 8

6,

15,

20,

29

22

15

25

14

26

20

15 18

17

18

19

20

10

15

20 20

22

21

12

14

22

24

14 15

10

19

16

7, 9

12

19

12

12 12

21

18

14

5

7

6 6

3

9

8

3

DESCRIPTION

Machine

light

and

Lock

stitch

Single

Socket-type

Short

Drop

with

and

•

return

ing

thread

•

forward

arm,

feed.

reinforced

uniform

Reverse

to

and

strong

breakage.

Maximum

and7to

Vertical

the

right

Special

the

lineofstitching

on

order.

will be

The

will

9/64

fitted

upper

for

inch.

straight

451

medium

(Stitch

needle,

flat

stitch

feed,

forward

Trimmer.

of

seam

fittings

Unless

to

knife

K51,

weight

Catalogue

needle

bed

Pendant

feed

length

hand

stitch.

seam

stitch

the

as

for

trim

may

stitching.

for

stitching

fabrics.

Type

bar

link

bar

insures

operated,

Performs

reinforcing

length,

inch

Trims

desired.

trimming

can

be

otherwise

1/8

inch

be

thrown

#301)

1361

feeding

at

all

in

reverse.

1/8

furnished

ordered

to

Upper

and

(88x9)

level

speeds.

with

6

to

3/32

right

out

trimming

mechanism

feed

motion

with

spring

precise

minimum

the

5/16

inch

if

specified

machine

of

seam.

of

action

knife

stroke

tack

inch

from

to

at

Tapped hole and seat in rear of

for

mounting

a

light

fixture.

arm

provided

Compact stitch length mechanism is easy to

read

and

to

set.

Enclosed

knee

Needle

Presser

(.281)

lifter

inch.

knee

228710.

bar

lifter

rod

and

stroke, 1-9/64 (1.140) inches.

lift

(capacity

of

machine),

connection

Bed dirnensions: Length, 15-11/16 inches.

Width 7 inches. Working space

needle,8inches.

Double

arm

Needle

connections

Nylon

shaft

Controlled

hook

TOP

FROM

shaft

bearings

insert

and

shaft.

OF

THE

shielded ball

andatpulley

for

and

for

needle

bearings

feed

lifting

pressure

MACHINE

OPERATOR.

bearings

endofhook

feed

driving

bar

for

rock

shaft.

lubricated

PULLEY

feed

at

right of

at

both

driving

and

feed

connecting

driving

bearings

TURNS

ends

to

9/32

of

shaft.

lifting

link.

rock

on

OVER

Modified,

constant

ments.

Long

axis

(belt

regulated.

One

oil

holes

serve

Rotary

precise

stitching

threads

weight—permitting

"wash

Tension

rotary

other

hazards.

Two

vents

wrapping

take-up.

removes

Durable,

270926,

readily

moved.

Large

for

3/8

side

diameter

inches.

single

thread

Easy

to

point

rotary

driven);

reservoir

all

tension

thread

and

tension

with

and

guard,

control

all

materials

wear"

thread

The

excess

steel-reinforced,

from

arm

accessible

rim,

aluminium

inch

V-belt,isdesigned

of

for

5/16

control

thread.

automatic

and

principal

and

types

sewing.

mounted

from

cutters;

of

broken

other,

broken

shaft

when

belt

inch

rotary

to

Simple

sewing

three

bearings

pre-tension

throughout

of

lightest

broken

One,

on

rear

thread

to

rear

machine

groove,

round

take-up

meet

hook

lubrication

easily

natural

light

tensions

on

face

threads,

on

thread

rubber

hook

arm

2.9

leather

hook

to

on

in

devices

speed

and

plate,

face

around

of

thread

from

driving

pulley

for

safety.

inches.

maintains

require

adjust.

horizontal

can

accessible

machine.

achieve

range

synthetic

medium

for

perfect

protects

lint

plate,

rotary

guard,

take-up.

driving

shaft,

cover

276445,

Effective

belt,

and

pre

belt

is

Out

2-3/8

oil

re

be

of

CAUTION

Do

not

start

oughly

per

speed

period

mum

time

principal ment

machine

closeiy

is

the

operator

use.

efficient

Disregard

siderable

oiled,

Maximum

minute,

•

Run

the

• A

machine

of

speed

for

and

•

Reduce

woven

Maximum

nature

and

Never

speed

a

first

time,

oil

bearing

at

force

of

damage

machine

as

speed

with

new

few

that

should

for

the

to

reach

adequate

top

speed.

speed

or

efficient

of

the

machine

for

this

instructed

recommended

these

machine

days.

points

treated

operation,

type

the

precaution

to

until

SPEED

exceptions

has

been

be

run

first

few

the

moving

for

lubrication

of

machine

material.

speed

of

thread

beyond

work

machine.

on

at

slower

freedom

is

the

being

could

it

has

is

more

idle,

been

4, 5

5000

. . .

for

than

pages

a

minutes

parts.

before

when

dependent

ability

and

material

its

maximum

accomplished.

result

and

stitches

moderate

a

maxi

to

Check

of

move

running

sewing

of

in

thor

long

allow

upon

the

con

6.

,

in

SETTING

DRIP

PAN

Position

in Fig. 2,

edge

Using

enough

rock

KNEE

Using

Fig. 2)

table.

and

out

striking

Locate

equidistant

pan.

willbedirectly

in

machine;

Raise rock

below

certoin platform is

curely

Knee

suit clamping

drip

pan

with

its

of

lever

LIFTER

Locate

fall

machine

four

in

rod

three

fasten

through

rock

cut-outintable.

3/4

inch

table

cut-out

(shown

7/8

rock

bracket

hole

edgeofhole.

lever

from front

Make

certain

under

then

securely

lever

knee

lifting

tighten

the

clamping

plate7may

requirementsofthe

screw

8. Knee

on

undersideoftable,asshown

right

end

wire

nails,

to

avoid

in Fig. 2).

inch

wood

lever

bracket

2sothat

provided

extension

and

rear

that

platform

knee

lifting

tighten

rod

5 to

rodinmachine,

turnedasshown

screw

be raised, lowered or

operator,

plate

moved toward the left or right

rear,

as

required

Tighten both screws 8

position is

Set

stop

stud

as

soonasknee

to

trip

hand

ing

screw

12.

MACHINE

HEAD

Machine

four

corners

tened.

Machine

head

except

chine

rest

after

obtained.

11 to

lifter

lifter on

head

should

of

cut-out

hinges

when

on

table.

loosening

and

10 securely

stop

the

raises

presser

machine.

rest

upon

in

table.

must

notberequiredtosupport

machine is tilted back

UP

even

with

right

fasten

screws

rock

for

3tohold

edges

drip

interference

(shown

2 to

underside

lever

rod

it in

drip

rock

of hole in drip

at

top

end

pan

can

pan

lever

rodA,^g. 5, page 5,

clamp

bring

whenatrest.

6.

arm9may

and

clamping

actionofthe

Securely

Machine

screw

Its

platform

in Fig. 2

turned

after

loosening

also

toward front or

screw

when

knee

foot

high

tighten

cushioning

is

not

upon

inside

low

with

at

rise

with

rod

of rod

4. just

Make

and

se

10.

correct

lifter

enough

clamp

pads

fas

ma

of

be

FRONT

EDGEOFTABLE

1,

PLATFORM

ROCK LEVER

ROD—

I ^

'f I

i# ;

to

Fig. 2.

Drip

Pan

and

beneath

in

the

Kne« Lifter

Table

BELT

the

guard

Insert

belt

so

tighten

guard

NOTE:

machine

Remove

bracket

belt

guard

that

with

GUARD

It

just

the

Belt

only

arm

guard

4,

as

Allen

the

Guard

when

side

1,

Fig.3with

support

illustrated.

clears

screws

special

106505

requested

cover

3,

the

in

key.

screw

long

Into

Adjust

machine

the

is

supplied on

hinge

bracket

order.

and

belt

pulley,

fit

screw

1,

guard

and

with

belt

2.

and

then

belt

Fig.3.Belt

•>;

GuardInPosition

OIL

FILL

OIL

SHOULD

HIGH

reservoir:

OIL

AT

NEVER

O FALL BELOW

MARK

Fig. 4. Oil Reservoir

Oiling

PointsonMachine

MARK

and

SHOW

—

AlToW

ON*

GAUGE

other

oil

LOW

OIL

DIRECTION

OF

ROTATION

When

always

as

must

shown

CAUTION:

eventotest

oiled

as

instructed

LUBRICATION

Use

SINGER*

machine

turn

in

Fig.

the

OIL

MACHINE

Is In

over

4.

Do

not

speed,

below.

'TYPE

PULLEY

operation,

away

start

from

the

untilithas

AND

CLEANING

A"or"TYPE

machine

the

machine,

been

thoroughly

C".

pulley

operator,

not

See

inside

front cover of this book for description of these oils.

Keep

machine

OIL

RESERVOIR

Fill

by lifting out oil

in machine bed,asinstructed in Fig. 4. Reservoir

plies oil to

clean

sewing

end

well

oiledatoil times.

gouge

and

applying oil to hole

hook race, to eccentrics

sup

and

front bushing on hook driving shaft.

DAILY

shown

Add oil, when necessary to maintain level

mark. Never allow oil level to

on

CARE

Applyafew

In

Fig.

drops.of

4.

Check oil level in reservoir

gauge.

oil

to

before

drop

the

four

oil

starting machine.

at

below lower

holes

HIGH

mark

to

Fig. 5. Priming Points

Machine

Fig. 6. Bobbin Winder Lubrication

beneath

Bed

Occasionally

driving

shown

cover

AFTER

before

INSTALLATION

New

crank

in

machines

and

the

replacing

remove

insert

and

the

apply

Fig.

it.

machines

cover

oil to

4.

installed

for

the

Always

the

oiling

clean

after

trimmer

points

the

several

weeks of idleness should be primed before using.

Residual lubricant

congealed or

disappeared

may

have

entirely.

Apply a few

in Fig.5,beneath

Oil

hook

and

adjust

and

on

page

as

instructed

BOBBIN

WINDER

Apply a

necessary,

dicated

CLEANING

hook

throat

in Fig. 6.

Remove

and

plate.

Remove

drops

of oil to priming points shown

machine

assembly

when

few

necessary,

6.

Proceed

above.

drops of oil daily,ormore often

to oil wick in

all

lint

and

from

between

dirt

from

clean-out

bed.

by

hand.

with

bobbin

abrasive

feed

as

instructed

"DAILY

winder

matter

rows

hole C, Fig. 4 in

Check

frameasin

from

on

underside

oil

flow

below

CARE"

when

around

needle

of

bar, pushing shank of a needle through hole. Wipe off all excess oil from

come

in

contact

with

areas

material

of machine that may

to

be

sewn.

Machines not in use should be kept well oiled, clean,

dry

and

covered.

HOOK

LUBRICATION

Rotary

cated. N.

Fig.9,as

Thread machine,asinstructed on Sew

Remove

stitching

Remove

Run

tablish

chine, hold a piece of white

for 15

Remove

tern of

one

heavier,-wider

If

test

paper

Remove

chine.

Remove screw R

two hook

Loosen

plete

whenever

An

202423

O, Fig. 9orthat

sewing

Flowofoil is

HOOK

hook

instructed

LUBRICATION

AND

Is

automatically

regulated

below.

ADJUSTMENT

by

TEST

turning

pages7and

about

three

material.

quality

bed

machine

a uniform

seconds

without

paper

three

sprays

there

is

no

needle,

screwsDand

driving

276062

shaft,asinstructed

filter

screwO,Fig. 9

(see Fig. 9.) Oil wick

yardsofscrap

Pay

no

or

amount

slide

E, Fig. 8.

for

approximately

rateofflow.

moving

and

inspect:

(two light lines on outside

lineincentre)asshown

trace

of

oil

bobbin

and

remove

and

position

sewing

material.

attentionatthis

of oil

spray.

one

minute

Without

paper

There

or

on

bobbin

finger

on

and

stopping

underneath

during

should

excess

case

S, Fig. 8. Loosen

hook

B, Fig. 8

page

check

shouldbereplaced

it has become clogged by lint or dirt from oil.

excess

has

of

become

oil

filter

sometimes

indicates

detached

screwisnot

from

securely

be o

in Fig.

of

from

23.

oil

wick

that

filter

tightened.

lubri

screw

9.

time

to es

ma

hook

interval.

pot-

and

oil

on

ma

from

com

oil

wick

screw

Fig. 7.

Approximate

to

7.

Fig. 8. Rotary

Repairorreplaceasrequired.

Inspect all oil

that

they

Just

plain

passagesinshaft

have

not

dirt

can

become

prevent

clogged

oil

and

bushingtosee

with

lintordirt.

from

reaching

its

objective.

The

hook

shaft

bushing

lating

screw

N, Fig. 9

Turninginscrew

plied to hook,

"MORE" on

end

as

of

Backing screw N out,

as

indicated

Normal

screw

N in ail

2-1/2

if

continuous

considerable

To

test

chine, hold test

machine

streak

by

adjustment

the

turns. Less

runs

sizingisbeing

oil

flow

running

should

then

arrow

way,

than

are

while

paper

at

When correct flow is

and

position-finger, as instructed on

Make

certain oil shield U is In placeasshown in

Fig. 9. It is

ing

underside

Re-test

hook

removed

providedtoprevent

of

throat

oil

flow

lubricationissatisfactory,

earlier.

K, Fig. 9

for

controlling

N,

increases

indicated by

bushing.

decreases

and

word

is

accomplished

then

backingitout

be

2-1/2

under

full

about

being

hook

speed)

turns

made

stitched.

end

1/16

obtained,

plate.

as

instructed

contains

the

amount

arrow

amount

"LESS

may

or

is

removed

of hook

for

15 seconds. Oil

inch

replace

poge

excess oil

above.

replace

the

regu

oil

flow.

of oil

and

word

supplied,

".

by

turning

again

about

be

required

material

from

shaft

(with

wide.

sewing hook

23.

from

reach

When

all

sup

with

ma

parts

Fig. 9

Adji/sting

L

o\ycy-

Fig. 10.

Sewing

Oil

I;

%

I

Setting

Sproy

Pattern

Hook

OILWICK

FlowtoHook

MOVE

.

"

INSERT

UP

POSSIBLE

TIGHTEN

^LONG

Needle

202423

HIGHEST

POINT

LOOSEN

SCREW

NEEDLE

AS

FAR

GROOVE

TO

AS

AND

SCREW

Use SINGER* needles, Catalogue

made

in a

variety

of

sizes.

1361

(88x9)

These needles have a nickel finish but may be

supplied

Chrome

recommended.

with

plating

chromium

of

finish

sizes9and

when

smaller

so

ordered.

ORDERS FOR NEEDLES should specify

Quantity required,

number.

Examples

"100

Sizeof the needle to be used

by

typeofmaterial

which

. . .

Size 16, Catalogue

must

pass

HOLD THIS END

Fig,

t1.

Size

number and Catalogue

1361

(88x9) Needles"

being

should

sewn

andbysizeofthread

freely

How to Detormine Thread Twist

through

ROLL

TOWARD

be determined

the

eyeofneedle.

OVER

YOU

TO

SET THE NEEDLE

Turn machine pulley over away from you until

needle

Fig.

and insert new needle up into needle

is

not

it will

needle faces

barisat

10,

page

Loosen

needle

go.

Make certain

away

its

6. clamping

that

highest

point,

screw. Remove old

as

bar

single continuous groove

from hook

(toward

the

shown

needle

as far as

left end

in

of

of machine, as shown in Fig. 10, page 6) with eye

of

needle

Securely tighten clamping screw.

CHECK

ARE

•

a

causeofthreod

•

groove—causesofskipped

•

or

frayingofmaterial.

• Incorrect

breakage.

Left

rightorleft

Hold

toward you between thumb and forefinger of right hand; if left

twist, strands will unwind or separate.

Rough

with difficulty through the eye of the needle, will

interfere

directlyinline

NEEDLE

NOT

Wrong

Bent

Hook

twist

threadasshown in Fig. 11. Twirl

OFTENTOMAKE

PRESENT . . .

needle

for

breakage.

needle, clogged needle eye or dirty needle

or burr on

setting

thread

twist

twist,

should

thread

strands

with

thread

needle

of needle—a

THREAD

and

stitches.

point—causeofpicking

be

usedinneedle.

can

be

will

wind tighter; if right

armofmachine.

SURE

THESE

material

cause

usedinbobbin.

thread

or uneven thread, or thread which passes

with

successful

use

of

machine.

DEFECTS

in use—

of

needle

Either

over

UPPER

Turn machine pulley

you until

position.

WRAP

Threading

the

MOVE

HIGHEST

POINT

Needle

TO

m

to/\\

to

Fig. 12. Upper Threading Completed

l'/2

AROUND

7 5

(Yi

THREAD

TURNS

DISC

Pass

through

Fig.

When

tomed

thread

ing

continuous

Thread

Leave

thread

shown

start

THREADING

needleisat

thread

threading

#12

12.

you

to

threading

canbepassed

point#4to

motion.

needle

about

behind

in

Fig.

sewing.

in

have

needle

from

the

12

from

points

order

become

this

from withasingle

left to

three

presser

with

away

from

its highest

unwinder,

#1

shown

accus

machine,

thread

right.

inches

foot,

which

in

of

as

to

Turn

needle

Fig.

moves

12,

TO

machine

uptoIts

Page

7.

REMOVE

pulley

highest

over

BOBBIN

away

from

point,asshown

you

until

V-j1l\

rr6

m)

in

Reach

remove

in Fig.

beneath

bobbin

13.

bedofmachine

case

from sewing hook,asinstructed

with

left

hand

and

While latch is kept open, bobbin will be retained

in

bobbin

To

remove

case.

bobbin

from

bobbin

case,

release

latch

and turn open end of bobbin case downward. Bobbin

will

drop

out,asshown

TO

INSTALL

Bobbin

winder

should

with its driving pulley

in

frontofmachine

Pulley will then

chine

belt

when

make

thumb

Pulley will be releosed from contact with belt

when

sufficient

bobbin.

thread

in Fig.

BOBBIN

be

14.

WINDER

fastened

approximately

belt,asshown

in Fig.

firm contact with ma

latch is

has

been

pressed

wound

to

1/4

table

inch

15.

down.

upon

PRESS

DOWN

TO

pushPs

PULLEY

AGAINST

BELT

W/

i Ib

Fig. 13. Removing Bobbin Case

from

Sewing

Hook

ml

3.

RELEASE

LATCH

4.BOBBIN

DROPS

OUT

Fig. 14. Removing Bobbin from

1.

PLACE

BOBBIN

ON SPINDLE CONTROL

AS

FAR

WILL

AS—

GO

IT

Case

TENSION

\

Place

will go

shown

Wind

direction latch,

in

Fig.

Start

Bobbin

TO

stop

automatically

mately

bobbin

and

pass

above.

end

of

shown

pushing

15.

machine.

canbewound

AVOID

1/16

SPILLAGE:

inch

TO

WIND

on

spindle,

thread

through

around

in Fig. 15.

driving

pulley

while

Regulate

when

shortofbobbin

BOBBIN

pushing

it onasfarasit

threading

bobbin

Press against

a

down

belt,

few

machineisstitching.

bobbiniswound

bobbin

rim.

points,

times

on

thumb

as

shown

winder

approxi

START^«s^

MACHINE

as

in

to

n

note::tTghten

FOR MORE THREAD _

^.=^2.

WIND

around

ON

BOBBIN

Fig. 15. Winding Bobbin

Fig. 16. Plocing Bobbin

in

Bobbin

THREAD

bobbin

Cot*

DRAW

DOWN

UNDER

HRFAirv.Al^

THREADTN

AND

SPRlN0^

I

U \\

[

/^SLOT

THREAD

INTO

3.TURN

OVER THREAD

INTO

EYE

BOBBIN

AND

DRAW

UP

DELIVERY

, _

1(2

CASE

^

TO

THREAD

Hold

bobbin

direction

Hold

place

Pull

Draw

bobbin

thread

2,

thread

and

spring

spring,asshownat3,

so

that

shown

In Fig.

caseasshown

bobbin

Into

into slot 1, Fig. 17

Fig.

17.

into delivery

BOBBIN

thread

16,

it.

Fig.

will

Page

In

and

eyeatend

18.

CASE

unwind

8.

Fig.

under

16,

of

in

the

Page

tension

8

Fig. 17. Pulling Thrsod

into

the

Slot

K'T^dlDING

gplPL-ACt^BO'BfflT

Fig. 19. Bobbin Cat* Threadod

LAt(

C3.

^CATCHES

and

Replaced

Fig. 18. Drawing Thread

Under

An

LATCH

PRE®

-BAOTV,

UNTlt;

LAtCW

GRO^VE^^

IN

STUD

Tension

^ i

Spring

{ )

TO

1. After

2.

3. Press

Allow

thumb

bobbin

as

shown

Release

near

threading

and

caseoncentre

latch.

bobbin

endofstud.

about

TO

• Hold slack

machine pulley

moves

ing

down

and

bobbin

•

Drawupneedle

thread.

REPLACE

first

in Fig.

case

three

PREPARE

endofneedle

over

up

bobbin

finger

19.

back

inches

(See Fig.

away

again

thread;

BOBBIN

case,

of

studofbobbin

until latch

of

FOR

20)

grasp

left

thread

SEWING

thread

CASE

hand

catches

loosely

from you until

to Its

highest

bobbin

thread

latch

case

to

point,

between

and

groove

hang

and

will

place

holder,

free.

turn

needle

catch

come

up with it through hole in throat plate, as shown in

Fig.

20.

o Lay

0

Alwoys

operation.

Close

both

bed

keep

threads

slide.

bed

back

slide

under

closed

presser

when

foot.

machine

is in

Fig. 20.

Drawing

Up Bobbin Thread

Singer 451K51 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual