Singer 15-91 Installation and operation manual

20328

INSTRUCTIONS

Use

SINGER*

SEWING

MACHINE

FOR

USING

/OIL

on

Machine

S

]

N

G

E

R*

4

ELECTRIC

SEWING

MACHINE

Hiastone

fom

ee

oa

ite

(P.

G.

Built-on

Motor)

—_—

the

great

importance

of

using

good

oil,

|

:

9

|

‘

SINGER

sells

an

extra

quality

sewing

i

machine

oil,

in

cans,

especially

prepared

REVERSIBLE

FEED

?

:

LOCK

STITCH,

FOR

FAMILY

USE

for

sewing

machines.

Use

SINGER*

MoToR

LUBRICANT

on

Motor

The

SINGER

Motor

LUBRI-

CANT

is

especially

prepared

for

lubri-

cating

the

bearings

of

the

electric

motor.

This

is

a

pure

non-flowing

compound

which

retains

its

consistency

and

pos-

sesses

high

lubricating

qualities.

MacuineE

15-91

*A

TRADE

MARK

OF

THE

SINGER

MANUFACTURING

COMPANY

TO

ALL

WHOM

IT

MAY

CONCERN:

Theimproper

placing

or

renewal

of

the

Trade

Mark“‘SINGER”

or

any

other

of

the

Trade

Marks

of

The

Singer

Manufacturing

Company

(all

of

4

which

are

duly

Registered

Trade

Marks)

on

any

‘\

Amachine

that

has

been

repaired,

rebuilt,

recon-

ditioned,

or

altered

in

any

way

whatsoever

outside

a

SINGER

factory

or

an

authorized

SINGER

agency

is

forbidden.

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.,

1915,

1923,

1926,

1931, 1932,

1933,

1935,

1936,

1938,

1940, 1947, 1950,

and

1951

by

The

Singer

Manufacturing

Company

All

Rights

Reserved

for

All

Countries

SINGER

SERVICE

Now

that

you

have

purchased

your

new

SINGER,

we

do

not

want

you

to

feel

that

your

relations

with

us

have

come

to

an

end.

You

are

cordially

invited

to

visit

your

SINGER

Shop

at

any

time

for

assistance

in

your

sewing

problems.

You

will

be

most

welcome.

We

hope,

too,

that

you

will

make

the

SINGER

Shop

your

headquarters

for

sewing

supplies

and

service.

Only

there

or

through

authorized

bonded

SINGER

representatives

can

you

secure

warranted

SINGER

Srewrne

Macutne

Om,

needles,

belts,

parts,

etc.,

so

important

in

getting

the

best

¥esults

from

your

machine.

And

remember,

only

an

authorized

SINGER

representative

should

be

allowed

to

touch

your

machine

when

repairs

or

adjustments

are

required.

World-wide

SINGER

Service

has

no

equal,

Use

it!

»

=

Ss

=

Ss

s

=

AND

FEED

REVERSING

HANOLE

3-PIN

TERMINAL

BODY

PLATE

STITCH

REGULATOR

‘STITCH

INDICATOR

BOBBIN

WINDER

THREAD

TENSION

£20407

BOBBIN

WINDER

SPOOL

THUMB

SCREW

BED

THUMB.

SCREW

THROAT

PLATE

—NEEDLE

CLAMP

papa

FEED

006

THREAD

GUARD

NEEDLE

CLAMP

PRESSURE

REGULATING

THUMB

SCREW

a

\

TENSION

DISCS,

TE.

TENSION

REGULATING

LEVER

FACE

PLATE

SCREW.

FACE

PLA

PRESSER

BAR

LIFTER

SPRING

THREAD

CUTTER,

PRESSER

BAR

PRESSER

FOOT

THUMB

SCREW

BED

SLIDE

PLATE

THREAD

TAKE-UP

THUMB

NUT

Fra,

2

Names

or

Principat

Parts

or

Macutnes

15-91

0

DESCRIPTION

This

SINGER

family

sewing

machine

will

give

you

practically

life-time

service.

It

is

intended

for

operation

by

electricity,

having

an

electric

motor

built’

on

the

back

of

its

arm,

The

motor

drives

the

machine

through

spiral

gears.

It

is

also

equipped

with

an

electric

SINGER-

LIGHT*.

The

machine

has

an

oscillating

shuttle

on

a

hori-

zontal

axis

and

makes

the

lock

stitch.

It

has

reverse

feeding

mechanism

which

enables

you

to

sew

either

in

a

forward

or

backward

direction,

making

it

easy

to

back

tack

and

to

fasten

the

ends

of

seams.

In

addition

to

plain

sewing,

a

great

variety

of

pleasing

effects

such

as

hemming,

binding,

edge

stitching,

shirring,

ruffling,

etc.,

can

be

produced

with

the

aid

of

the

attachments

furnished

with

the

machine.

These

attachments

and

other

popular

SINGER

Fashion

Aids

will

enable

you

to

obtain

the

much

desired

tailored

appearance

of

professionally-

made

garments

and

to

add

new

fashion

touches

or

finishes

demanded

by

swiftly

changing

styles

at

a

fraction

of

the

cost

of

ready-made

garments.

READ

THIS

BOOK

CAREFULLY

TO

GET

THE

UTMOST

SERVICE

FROM

YOUR

SEWING

MACHINE

6

ELECTRICAL

INFORMATION

Motor

The

SINGER

electric

motor,

located

at

the

back

of

the

machine,

is

regularly

furnished

for

operation

on

a

direct

current

of

110-120

volts

or

on

alternating

current

of

110-120

volts,

25

to

75

cycles.

Special

motors

can

be

furnished

for

direct

or

alternating

current

for

any

voltage

between

50

and

250,

and

for

32

volts

direct

current.

To

Connect

Machine

to

Electric

Service

Line

Before

connecting

the

machine

to

the

electric

ser-

vice

line,

be

sure

that

the

voltage

and

the

number

of

cycles

stamped

on

the

motor

nameplate

are

with-

in

the

range

marked

on

the

electric

meter

installed

by

the

electric

power

company.

Push

the

terminal

plug

at

one

end

of

the

electric

cord

on

the

three-pin

terminal

block

(see Fig.

2,

page

4)

at

the

right

of

the

machine

and

connect

the

plug

at

the

other

end

of

the

cord

to

an

electric

outlet.

CAUTION

When

you

have

finished

your

sewing,

always

disconnect

the

plug

from

the

electric

outlet.

_

SINGERLIGHT

The

SINGERLIGHT

is

turned

“on”

or

“off”

by

the

switch

A,

Fig.

3.

To

Remove

the

Bulb

Fie.

3.

RepLactne

tHE

BuLB

Grasp

the

SINGERLIGHT

socket

so

that

the

thumb

extends

over

the

switch

A.

Press

the

shade

with

the

thumb

at

B

to

release

the

shade

from

the

two

catches

and

slide

it

half-

way

out

of

the

shade

holder

D.

Do

Not

Attempt

to

Unscrew

the

Bulb.

It

is

of

the

bayonet

and

socket

type

and

does

not

unscrew.

Press

the

Bulb

Into

the

Socket

and

at

the

same

time

turn

the

bulb

over

from

the

machine

as

far

as

it

will

go,

then

withdraw

the

bulb.

To

Replace

the

Bulb

Hold

the

socket

with

one

hand

and

at

the

same

time

with

the

other

hand

press

the

new

bulb

into

the

socket

and

turn

it

over

toward

the

machine

until

the

bulb

C,

Fig.

3

enters

the

notch

in

the

socket.

_

Return

the

shade

to

its

normal

position,

as

shown

in

Fig.

3.

8

TO

OPERATE

THE

MACHINE

Raise

the

presser

foot

B

by

means

of

the

presser

bar

lifter

C

to

prevent

injury

to

the

foot

B

and

feed

A.

lezowo__

Fie.

4.

Front

View

or

rae

Macuine

Place

a

piece

of

cloth

under

the

presser

foot

and

let

the

foot

down

upon

it.

Turn

on

the

electric

current

and,

if

the

combina-

tion

knee

and

foot

controller

is

installed

as

a

knee

controller,

press

the

controller

to

the

right,

or,

if

the

controler

is

placed

on

the

floor

to

be

used

as

a

foot

controller,

press

down

on

the

pedal

of

the

controller.

As

the

pressure

on

the

controller

is

increased,

the

speed

of

the

machine

is

increased,

the

speed

being

controlled

entirely

by

the

amount

of

pressure

on

the

controller.

Operate

the

machine

in

this

way,

without

being

threaded,

until

you

have

become

accustomed

to

guiding

the

material

and

operating

the

controller.

9

NEEDLES

AND

THREADS

For

perfect

stitching,

the

thread

should

be

selected

according

to

the

fabric

to

be

stitched

and

the

needle

must

be

the

correct

size

for

the

thread

which

must

pass

freely

through

the

eye

of

the

needle.

CHART

SHOWING

THE

RELATIONSHIP

OF

TYPES

OF

FABRICS,

THREAD

AND

NEEDLE

SIZES

AND

MACHINE

STITCHES

TO

THE

INCH

|

MACHINE

TYPES

OF

THREAD NEEDLE

STITCHES

FABRICS

SIZES

PER

INCH

Filmy

materials

comparable

100

Cotton

to

Net,

Marquisette,

Or-

OO

and

OOO

9

INSIDE)

TOP

SEAMS

STITCHING

gandie,

Ninon,

Silk

|

[20:1

se

Sheer

materials

comparable}

to

Lawn,

Dimity,

Voile,

80

to

100

11

16

20

Batiste, Chiffon,

Rayon,

Cotton

Sheer,

Rayon

Crepe.

O

Silk

Lightweight

muterials

com-|

60

io

80

i

parable

to

Gingham,

Cham-

Cotton

14

12

18

ray,

Sheer

Wool

Crepe,

A

and

B

Silk

Taffeta.

Medium

lightweight

mater-)

1

ials

comparable

to

Poplin,

Pique,

Percale,

Cretonne,|

50

to

70

Chintz,

Faille,

Bengaline,

Cotton

14

12

16

Wool

Flannel,

Wool

Crepe,,

B

Silk

|

Wool

Jersey.

|

Medium

heavy

materials)

.

comparable

to

Crash,

Gab-|

40

to

50

|

ardine,

Rep,

Corduroy,

Cotton

16 19 12

Velveteen.

C

Silk

Heavy

materials

compar-

30to40Cotton

18

Tay

able

to

Sailcloth,

Denim,|24to30Cotton

19

8

10

Ticking.

D

Silk

18

or

19

40

to

60

Linen

Very

heavy

materials

com

|20to24Cotton

21

6

8

parable

to

overcoating.

E

Silk

|

9

:

Mercerized

Plastic

materials.

Cotton

11

10

12

When

ordering

needles,

always

specify

“Class

and

Variety

15x1”’and

state

the

size

and

quantity

required.

10

TO

SET

THE

NEEDLE

Select

the

cor-

rect

needle

ac-

cording

to

the

K

table

on

page

9.

Be

sure

that

the

needle

is

not

blunt

or

bent.

Raise

the

needle

bar

to

its

highest

osition

and

oosen

the

thumb

screw

K

in

the

needle

clamp.

Push

the

needle

with

its

flat

side

to

the

left

up

into

the

needle

clamp

as

far

as

it

will

go,

then

tighten

the

thumb

screw.

UPPER

THREADING

(Sex

Fie.

6

on

THE

Fotuowrna

Pace)

Raise

the

take-up

lever

5

to

its

highest

point.

Place

the

spool

of

thread

on

spool

at

top

of

machine

Pass

the

thread

through

the

thread

guide

1

Down,

under

and

from

back

to

front

between

the

tension

dises

2

(the

thread

guard

L

guiding

the

thread

between

the

dises)

:

Hold

the

spool

tightly

and

pull

the

thread

against

the

take-up

spring

4

until

it

enters

the

retain-

ing

fork

3

Pass

the

thread

from

back

to

front

through

the

hole

5

in

the

take-up

lever

Down

through

the

guide

6

on

the

face

plate

Into

the

guide

7

on

the

needle

clamp

From

right

to

left

through

the

eye

8

of

the

needle.

Draw

about

two

inches

of

thread

through

the

eye

of

the

needle

with

which

to

commence

sewing.

19010

i

Fra,

5,

Serrina

rue

NEEDLE

ll

Fie,

6.

Upper

THREADING

<—8

&/9035

12

TO

REMOVE

THE

BOBBIN

Raise

the

take-up

lever

5,

Fig.

6

to

its

highest

point.

Withdraw

the

bed

slide

plate.

Reach

down

with

the

left

hand

and

open

the

bobbin

case

latch

M,

Fig.

7

and

lift

out

the

bobbin

case.

Release

the

latch

and

remove

the

bobbin

from

the

bobbin

case.

£19074

Fie.

7.

Removing

tHE

Bonstn

Case

TO

WIND

THE

BOBBIN

(Sue

Fic.

8

on

tHE

Fottow1nae

PAGE)

Hold

the

balance

wheel

D

with

the

left

hand

and,

with

the

right

hand,

loosen

the

stop

motion

screw

E

to

release

the

balance

wheel

from

the

stitching

mechanism.

Place

the

bobbin

on

the

bobbin winder

spindle

as

far

as

it

will

go,

having

the

small

enter

the

hole

in

the

side

of

the

bobbin.

13

Place

the

spool

of

thread

on

the

spool

1

Pass

the

thread

to

the

right

between

the

tension

dises

2

Up

and

to

the

left

through

the

hole

in

the

left

side

of

the

bobbin

3,

from

the

inside.

Fie.

8.

Wrxpine

THE

BosBin

The

end

of

the

thread

must

be

held

by

the

hand

until

a

few

coils

are

Wound

and

then

should

be

broken

off,

Press

down

on

the

bobbin

and

the

bobbin

winder

latch

will

drop

down

and

hold

the

bobbin

winder

pulley

against

the

hub

of

the

balance

wheel.

Then

operate

the

machine

the

same

as

for

sewing.

When

sufficient

thread

has

been

wound

upon

the

bobbin,

the

bobbin

winder

is

automatically

released

from

the

balance

wheel.

Then

tighten

the

stop

motion

screw

E,

14

If

the

pressure

of

the

bobbin

winder

pulley

against

the

hub

of

the

balance

wheel

is

insufficient

for

wind-

ing

the

bobbin,

press

down

the

bobbin

winder

until

the

latch

N,

Fig.

9

drops

down

and

holds

it,

then

loosen

the

adjusting

screw

O,

Fig.

9.

With

the

fore-

finger,

push

back

the

upper

end

of

the

slotted

plate

P

as

far

as

it

will

go,

as

shown

in

Fig.

9,

and

at

the

same

time

press

the

bobbin

winder

pulley

against

the

hub

of

the

balance

wheel,

then

tighten

the

adjusting

screw

O.

Fie.

9.

ApsustMENT

or

Bopsrn

WINDER

If

the

thread

does

not

wind

evenly

on

the

bobbin,

loosen

the

screw

which

holds

the

tension

bracket

2,

Fig.

8

in

position

on

the

bed

of

the

machine

and

slide

the

tension

bracket

to

the

right

or

left,

as

may

be

required,

then

tighten

the

screw.

Bobbins

ean

also

be

wound

while

the

machine

is

sewing.

15

16

TO

THREAD

THE

BOBBIN

CASE

TO

REPLACE

THE

BOBBIN

CASE

Hold

the

bobbin

case

by

the

latch

and

place

it

ld

the

re

need

on

the

stud

T

of

the

shuttle

body

with

the

position

the

thread

will

finger

S

opposite

the

notch

at

the

top

of

the

shuttle

unwind

in

the

direction

shown

in

Fig.

10,

race,

bobbin

Hold

the

case

as

shown

in

Fig.

10,

and

place

the

bobbin

into

it.

Fie.

13.

Bossrn

Case

THREADED

AND

RepLaceD

Release

the

latch

and

press

the

bobbin

case

back

until

the

latch

enters

the

groove

in

the

stud.

Allow

Pull

the

thread

into

the

slot

1,

under

the

ion

spri

]

£19009

jefe

the

not

4

f

ne

about

three

inches

of

thread

to

hang

free

from

the

end

of

the

spring.

Brats

bobbin

case

and

close

the

bed

slide

plate.

17

TO

PREPARE

FOR

SEWING

Hold

the

end

of

the

needle

thread

with

the

left

hand

and

turn

the

balance

wheel

over

toward

you

until

the

needle

goes

down

and

up

again

and

the

thread

take-up

lever

5,

Fig.

16

is

at

its

highest

point.

Pull

up

the

needle

thread

and

Fra,

14

bobbin

thread

will

come

é 5

Drawine

Up

Tae

Bonpin

with

it,

as

shown

in

Temas

Fig.

14.

Lay

both

threads

back

under

the

presser

foot

diag-

onally

across

the

feed,

as

shown

in

Fig.

15,

to

the

right

or

left,

depending

upon

which

side

of

the

needle

the

material

is

to

be

located,

so

that

when

the

presser

foot

is

lowered,

the

threads

will

be

firmly

held

between

the

feed

and

the

presser

foot

Fia.

15

THREADS

IN

PosITION

TO

Commence

Sewina

18

TO

COMMENCE

SEWING

Be

sure

to

have

the

thread

take-up

lever

*

5

at

its

highest

point.

Place

the

material

beneath

the

presser

foot

B,

lower

the

foot

by

means

of

the

presser

bar

lifter

C

and

com-

mence

to

sew,

turning

the

balance

wheel

over

toward

you.

Never

pull

the

ma-

terial

along

when

stitching.

This

is

liable

to

bend

the

needle.

Guide

the

material

only.

Never

operate

the

machine

without

cloth;

under

presser

foot.

Fre.

16

The

slide

over

the

bobbin

case

should

be

kept

closed

when

the

machine

is

in

operation,

The

balance

wheel

must

always

turn

over

toward

the

operator.

19

TO

TURN

A

CORNER

Stop

the

machine

when

the

needle

is

commencing

its

upward

stroke.

Raise

the

presser

foot

and

turn

the

work

as

desired,

using

the

needle

as

a

pivot,

then

lower

the

presser

foot.

BASTING

Adjust

the

stitch

regulator

X,

Fig.

17

to

make

the

longest

stitch

and

loosen

the

needle

thread

ten-

sion

A,

Fig.

21,

so

that

the

stitches

may

be

easily

removed,

Machine

basting

is

firmer,

more

even

and

much

quicker

than

hand

basting.

TO

SEW

FLANNEL

OR

BIAS

SEAMS

Use

a

short

stitch

and

as

light

tension

as

possible

on

the

needle

thread

so as

to

leave

the

thread

loose

enough

in

the

seam

to

allow

the

material

to

stretch

if

necessary.

TO

REMOVE

THE

WORK

Stop

the

machine

with

the

thread

take-up

lever

5,

Fig.

16

at

its

highest

position,

Raise

the

presser

foot,

draw

the

fabric

back

and

to

the

left,

and

sever

the

threads

on

the

thread

cutter

U,

Fig.

16.

Place

the

ends

of

the

threads

under

the

presser

foot,

as

shown

in

Fig.

15.

20

TO

REGULATE

THE

LENGTH

OF

STITCH

The

machine

is

adjustable

to

make

from

6

to

30

stitches

per

inch,

as

indicated

by

the

numerals

on

the

stitch

indicator

plate

W.

Ww

£19039

Fig.

17.

SHowrne

Lever

ror

Reverstne

Direction

or

Freep

anp

Reeuuatine

Leneru

or

Strrcw

The

number

of

stitches

to

the

inch

that

the

ma-

chine

is

set

to

make

is

indicated

by

the

number

which

is

in

line

with

the

upper

side

of

the

stitch

regulating

lever

X.

To

change

the

length

of

stitch,

loosen

the

thumb

screw

Y

and

move

it

to

the

bottom

of

the

slot.

Then

move

the

stitch

regulating

lever

X

until

its

upper

side

is

in

line

with

the

number

of

the

desired

length

of

stitch.

Now

move

the

thumb

screw

Y

until

the

stitch

regulating

plate

(inside)

touches

the

lever

X,

then

tighten

the

thumb

screw

Y.

The

machine

will

now

make

the

indicated

number

of

stitches

to

the

inch

in

either

a

forward

or

reverse

direction,

depending

on

whether

the

lever

X

is

at

its

lowest

or

highest

position.

21

TO

REGULATE

THE

DIRECTION

OF

FEED

To

feed

the

material

from

you,

push

down

the

stitch

regulating

lever

X,

Fig.

17

as

far

as

it

will

go.

To

feed

the

material

toward

you,

raise

the

stitch

regulating

lever

X

as

high

as

it

will

go.

The

direction

of

feeding

can

be

reversed

at

any

point

of

a

seam

without

removing

the

work

from

the

machine,

:

The

reverse

feed

makes

it

easy

to

do

‘“‘back

tack-

ing”

and

to

fasten

the

ends

of

seams.

TO

REGULATE

PRESSURE

ON

PRESSER

FOOT

For

ordinary

sewing,

the

pressure

of

the

presser

foot

on

the

material

seldom

requires

changing.

Heavy

materials

require

more

pressure

than

light

weight

materials,

The

pressure

should

be

only

heavy

enough

to

prevent

the

material

from

rising

with

the

needle

and

to

enable

the

feed

to

move

the

work

along

evenly.

To

increase

the

pressure,

turn

the

thumb

screw

V,

Fig.

16

clockwise

or

downward.

To

lighten

the

pressure,

turn

the

thumb

screw

so

that

it

screws

upward.

SINGER

Needles

should

be

used

in

SINGER

Machines.

These

Needles

and

their

Containers

are

marked

with

the

Company’s

Trade

Mark

‘“‘SIMANCO.*’’

|

Needles

in

Containers

marked

“FOR

SINGER

MACHINES”

are

NOT

SINGER

made

Needles.

2

22

THREAD

TENSIONS

For

ordinary

stitching,

the

needle

and

bobbin

threads

should

be

locked

in

the

center

of

the

thick-

ness

of

the

material,

thus:

758

Fie.

18.

Perrecr

StrrcHine

Tf

the

tension

on

the

needle

thread

is

too

tight,

or

if

that

on

the

bobbin

thread

is

too

loose,

the

needle

thread

will

lie

straight

along

the

upper

surface

of

the

material,

thus:

Fie.

19.

Tiagur

Nerpie

Tureap

Tension

If

the

tension

on

the

bobbin

thread

is

too

tight,

or

if

that

on

the

needle

thread

is

too

loose,

the

bobbin

thread

will

lie

straight

along

the

underside

of

the

material,

thus:

Ena

Fra.

20.

Loose

Negepie

Tareay

Pension

TO

REGULATE

THE

NEEDLE

THREAD

TENSION

The

tension

on

the

needle

thread

can

be

regulated

only

when

the

presser

foot

is

down.

The

numerals

‘‘0

to

9”’

on

the

dial

C,

Fig.

21

indicate

the

dif-

ferent

degrees

of

ten-

sion

that

can

be

obtained.

The

num-

bers

do

not

denote

the

size

of

thread

or

ounces

of

tension.

Fria,

21,

Neepie

THREAD

TENSION

23

When

the

tension

has

been

correctly

set

for

aver-

age

sewing,

note

the

number

at

the

indicator

line

Q,

so

that

the

tension

may

be

reset

should

it

be

altered

for

special

work

or

change

in

size

of

thread.

Toincrease

the

tension,

turn

the

thumb

screw

A

gradually

to

the

right

(clockwise)

until

the

required

tension

is

obtained.

Each

higher

number

denotes

increased

tension.

To

decrease

the

tension,

turn

the

thumb

screw

A

gradually

to

the

left

(counter-clockwise)

until

the

required

tension

is

obtained.

Each

lower

number

denotes

less

tension.

TO

REGULATE

THE

BOBBIN

THREAD

TENSION

The

tension

on

the

bobbin

thread

is

regulated

by

the

screw

R,

Fig.

11

in

the

tension

spring

on

the

outside

of

the

bobbin

case.

To

increase

the

tension,

turn

the

screw

R

over

to

the

right.

To

decrease

the

tension,

turn

this

screw

over

to

the

left.

When

the

tension

on

the

bobbin

thread

has

been

once

properly

adjusted,

it

is

seldom

necessary

to

change

it,

as

a

correct

stitch

can

usually

be

obtained

by

varying

the

tension

on

the

needle

thread.

24

TO

DISASSEMBLE

THE

NEEDLE

THREAD

TENSION

NOTE:

The

needle

thread

tension,

Figs.

21

to

23

inclusive,

is

correctly

adjusted

at

the

fac-

tory

to

produce

the

complete

range

of

tensions

with

one

revolution

of

the

thumb

nut

A.

There

should

be

no

necessity

for

removing

or

taking

this

tension

apart.

However,

if

for

any

reason,

it

becomes

necessary

to

remove

the

tension,

proceed

as

follows:

Turn

the

thumb

nut

A,

Fig.

22

away

from

you

(toward

the

left)

until

it

stops

at

“0”

on

the

num-

Fre.

22.

Neepie

Tureap

Tension

DIsass—EMBLED

bered

dial

C.

Press

in

the

dial

to

disengage

the

B

in

the

thumb

nut

and

remove

the

thumb

nut,

dial,

stop

washer

D,

tension

spring

F,

indicator

G,

the

two

tension

dises

H,

thread

guard

plate

L,

and

the

tension

releasing

J,

as

shown

in

Fig.

22.

To

remove

the

J

from

the

stud

N,

take

off

the

face

plate

and

tilt

it

so

that

the

will

drop

out.

25

TO

REASSEMBLE

THE

NEEDLE

THREAD

TENSION

Replace

the

face

plate,

insert

the

tension

releasing

in

the

stud,

place

the

thread

guard

plate

on

the

Vig.

23.

REassEMBLING

AND

REPLACING

THE

TENSION

stud,

being

sure

that

the

lug

M,

Fig.

22

engages

the

short

recess

P

to

prevent

the

plate

from

turn-

ing

on

the

stud.

Next,

replace

the

two

tension

discs

H

on

the

stud,

having

the

flat

thread-bearing

sides

of

the

dises

together.

Replace

the

indicator

G

with

the

large

open

side

facing

end

of

stud

so

that

the

plus

and

minus

signs

will

be

readily

seen

from

a

sewing

position

as

shown

in

Fig.

23.

Insert

the

ten-

sion

spring

F

in

the

indicator

so

that

the

first

half

turn

F2

of

this

spring

will

straddle

the

lower

half

of

the

tension

stud.

Guide

the

stop

washer

D

onto

the

stud

so

that

the

extension

S

will

be

above

the

ten-

sion

stud

as

shown

in

Fig.

23.

NOTE:

If

the

spring

and

stop

washer

are

in

cor-

rect

position,

the

extension

S

will

clear

the

first

half-

coil

of

the

spring,

$

*

as

shown

in

Fig.

24.

the

numbered

dial

on

the

stud

so

that

the

numeral

2

is

oppo-

£19048

Fre.

24

26

site

the

stop

washer

extension

S,

then

push

the

dial

to

compress

the

spring

so

that

the

thumb

nut

can

be

turned

onto

the

stud,

carefully

guiding

the

in

the

thumb

nut

into

one

of

the

holes

in

the

numbered

dial.

Lower

the

presser

bar

and

turn

the

thumb

nut

A

to

the

left

until

it

stops

at

“0.”?

Thread

the

tension

and

pull

the

thread

through

the

tension

dises

to

test

the

amount

of

tension

at

the

‘“O”’

position.

At

this

point

there

should

be

a

barely

perceptible

pull

on

the

thread

to

indicate

that

there

is

a

minimum

tension

which

gradually

increases

with

the

turn

of

the

thumb

nut

to

the

right,

providing

a

full

range

of

tensions

from

light

to

heavy

within

one

revolution

of

the

thumb

nut.

If

the

pull

is

too

strong

for

a

minimum

tension,

press

in

the

numbered

dial

to

disengage

the

in

the

thumb

nut

from

the

dial

and

reset

the

in

one

of

the

holes

to

the

left

of

the

This

resetting

of

the

will

produce

less

tension

at

zero.

On

the

other

hand,

should

there

be

insufficient

tension

at

zero,

press

in

the

dial

and

reset

the

in

one

of

the

holes

to

the

right

of

the

ting.

Repeat

this

process

until

the

desired

minimum

tension

is

obtained.

If

Correct

Stitching

is

Not

Obtained:

If

the

bobbin

thread

tension

has

been

disturbed,

or

a

correct

stitch

cannot

be

obtained

without

a

very

heavy

or

very

light

needle

thread

tension,

then

the

following

procedure

is

recommended:

Using

No.

50

thread

in

the

needle

and

on

the

bob-

bin,

adjust

the

needle

thread

tension

as

instructed

above.

Then

turn

the

tension

thumb

nut

to‘3”

and,

with

two

thicknesses

of

thin

material

in

the

machine,

adjust

the

bobbin

thread

tension,

as

instructed

on

page

23,

until

the

stitch

is

correctly

locked

in

the

material

as

shown

in

Fig.

18.

A

wide

range

of

materials

and

threads

can

now

be

accommodated

without

further

adjustment

of

the

bobbin

thread

tension.

27 28

Loosen

the

thumb

screw

in

the

round

cover

plate

at

the

back

of

the

machine,

turn

the

plate

upward

and

fasten

by

tightening

the

screw.

Turn

the

bal-

ance

wheel

over

toward

you

until

the

connecting

TO

OIL

THE

MACHINE

If

the

machine

is

used

continuously,

it

should

be

oiled

daily.

If

moderately

used,

an

occasional

oiling

is

sufficient.

Fie.

25.

Front

View,

Suowrne

Ornine Points

Apply

one

drop

of

oil

at

each

of

the

places

indicated

by

the

unlettered

arrows

in

Figs.

25,

27

and

28.

Fra.

26.

Omine

Ports

ar

THE

Back

or

THE

MACHINE

rod

Z,

Fig.

26

is

at

its

highest

position.

Then

apply

a

few

drops

of

oil

through

the

hole

in

the

top

of

the

machine

to

the

wick

which

is

retained

in

the

cap

of

the

connecting

rod,

as

shown

in

Fig.

26.

Also

oil

the

other

moving

parts

inside,

turn

the

cover

plate

down

and

fasten

it

as

before.

Draw

to

the

left

the

bed

slide

plate,

and

after

removing

the

lint

and

dust

which

may

have

accumu-

lated

(see

instructions

on

pages

31

and

32),

apply

oil

to

the

shuttle

race

A,

Fig.

30.

The

slide

should

then

be

closed

Singer 15-91 Installation and operation manual

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