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20533

ADJUSTERS

MANUAL

SINGER

SEWING

MACHINES

CLASS

20

SINGLE

THREAD

CHAIN

STITCH

THE

SINGER

MANUFACTURING

COMPANY

Copyright,

U.

S.

A.,

1936,

1952

and

1954,

by

The

Singer

Manufacturing

Company

All

Rights

Reserved

for

all

Countries

*A

Trade

Mark

of

THE

SINGER

MANUFACTURING

COMPANY

rom-mo

n»

p

ry

£22788

I

Fig.

2.

Principal

Parts

of

Machine

20-10

Thread

Hole

in

Tension

J.

Clamp

Screw

Bracket

K.

Stitch

Regulator

Tension

Discs

L.

Looper

Tension

Regulating

M.

Cloth

Plate

Thumb

Nut

N.

Presser

Foot

Thread

Nipper

©.

Cloth

Guide

Thumb

Screw

Spool

Pin

45P.

Cloth

Guide

Thread

Pull

Off

Q.

Needle

Set

Screw

Hand

Wheel

R.

Presser

Bar

Lifter

Driving

Handle

S.

Presser

Bar

T.

Needle

Bar

Clamp

3

DESCRIPTION

Machines

of

Class

20

are

practical,

convenient,

single

thread

chain

stitch

sewing

machines

made

especially

for

children.

They

may

also

be

used

by

adults

for

repairing

clothes

and

light

household

articles.

Machines

20-1

and

20-10

are

operated

manually.

Machine

20-2

is

operated

by

motor,

although

it

too

can

be

operated

manually

by

removing

motor

and

attaching

a

handle

to

hand

wheel.

All

Machines

of

Class

20

have

a

cloth

guide

for

use

when

sewing

close

to

edge

of

material.

The

rotary

looper

makes

one

revolution

per

stitch.

The

needle

is

threaded

from

left

to

right.

..

An

arm

side

cover

encloses

movable

parts

of

arm

of

Machine

20-10.

^

o4

i

A

clamp,

for

fastening

machine

to

a

table

or

desk,

is

furnished

_

with

all

Machines

of

Class

20.

All

electrical

parts

of

motor

of

Machine

20-2

are

enclosed

in

a

bakelite

shell,

eliminating

the

danger

of

electrical

shock.

The

motor

requires

no

attention

except

occasional

oiling.

It

must

be

used

only

on

110

volt,

60

cycle,

alternating

current

(A.

C.).

TO

PREPARE

MACHINE

FOR

SEWING

1.

Inspect

for

possible

damage

incurred

during

transit.

Bent

shaft,

broken

wheel,

etc.

Check

machine

for

free

turning

qualities.

Rinse

with

Varsol,

then

wipe

off

all

traces

of

tacky,

anti-rust

oil

used

to

protect

polished

and

plated

surfaces.

Oil

machine

completely.

See

page

14.

Wipe

away

any

surplus

cil.

5.

Check

condition

of

needle

before

making

sewing

tests.

See

item

`

4,

top

of

page

15.

6.

Check

timing

of

feed

and

position

of

looper

in

relation

to

needle.

See

page

9.

7.

Check

looper

shaft

for

correct

amount

of

end

play.

See

page

9.

Check

hand

wheel

for

correct

amount

of

end

play.

See

page

13.

Glazed

cotton

thread

is

recommended

for

improved

sewing

results.

10.

Sew-in

machine

and

check

stitching.

See

page

8.

DESCRIPTION

OF

24X

1

NEEDLES

Needles

for

Machines

of

Class

20

are

of

Class

and

Variety

24

x

1

in

Sizes

9,

11,

14

and

16.

The

size

of

needle

to

be

used

depends

upon

the

size

of

the

thread

which

must

pass

freely

through

eye

of

needle.

—

iae

Do

not

use

rough

or

uneven

thread

or

thread

which

passes

with

difficulty

through

needle

eye,

as

such

thread

will

interfere

with

the

successful

use

of

the

machine.

Although

needles

are

made

with

different

diameter

of

blades,

certain

dimensions

remain

constant

for

all

needles

of

the

same

Class

and

Variety.

FLAT

SIDE

BLADE

.

LL

OF

SHANK

i

-L——

j

|

£20961

E

E

NEEI

Fig.

3.

Needle

Distances

For

example,

the

distance

X

between

the

short-grooved

side

of

needle

blade

and

the

position

of

the

flat-side

of

the

needle

shank,

seated

in

needle

bar,

is

constant,

maintaining

an

identical

relation-

ship

between

short-groove

side

of

all

24

x

1

needles

and

looper

point.

Therefore,

any

increase

in

diameter

of

blade

results

in

a

shifting

of

only

the

centerline

of

needle

blade

away

from

looper

point.

Another

constant

is

distance

Y

from

end

of

shank

to

top

of

eye,

maintaining

an

identical

relationship

between

needle

eye

and

looper

point,

during

formation

of

thread

loop.

However,

the

size

of

needle

eye

increases

with

the

size

of

needle

to

accommodate

heavier

thread.

Therefore,

any

increase

in

the

length

of

a

24

x

1

needle

is

made

from

the

top

of

the

needle

eye

toward

the

point

of

the

needle.

HOW

TO

CHECK

A

=

NEEDLE

FOR

STRAIGHTNESS

Plaċe

flat

side

of

needle

on

cloth

plate

or

any

other

flat

solid

surface

PER

and

hold

up

to

light,

as

shown

in

Fig.

3A.

A

straight

needle

will

show

an

even

amount

of

light

under

it

and

point

will

be

in

line

with

shank.

Fig.

3A.

Checking

Needle

TO

SET

NEEDLE

IN

NEEDLE

BAR

Turn

hand

wheel

over

MOVE

TO

away

from

operator

until

ONT

needle

bar

reaches

its

high-

est

point.

Loosen

needle

set

screw

A,

Fig.

4.

With

flat

side

of

needle

to

the

right,

INSERT

Baza

;

NEEDLE

UP

as

shown

in

Fig.

4,

insert

AS

FAR

AS

needle

up

into

needle

bar

POSSIBLE

as

far

as

it

will

go

and

tighten

set

screw

A,

pe

Fig.

4.

Setting

the

Needle

FORMATION

OF

SINGLE

THREAD

CHAIN

STITCH

NEEDLE

OF

LOOPER

LOOPER

LOOPER

LOOPER

Fig.

5.

Looper

Entering

Fig.

6.

Loop

Being

Carried

Loop

of

Needle

Thread

Through

Previous

Loop

Fig.

5

shows

the

first

stage

in

stitch

formation.

The

needle,

after

descending

to

its

lowest

point,

has

been

slightly

raised

and

a

loop

of

thread

is

thus

formed

which

is

immediately

entered

by

point

of

looper

and

carried

by

it

into

the

preceding

loop.

Fig.

6

shows

the

second

stage.

The

loop

of

thread

is

being

car-

ried

by

point

of

looper

down

through

preceding

loop.

The

heel

of

looper

is

about

to

release

preceding

loop.

FORMATION

OF

SINGLE

THREAD

CHAIN

STITCH

(Continued)

s

LEED

ESE

ea

LOOPER

Fig.

7.

Loop

Enlarged

and

Fig.

8.

Loop

Further

Enlarged

Previous

Loop

Drawn

Up

and

Previous

Loop

Completed

Fig.

7

shows

the

third

stage.

The

loop

is

further

enlarged

by

the

downward

movement

of

point

of

looper.

The

preceding

loop

has

been

released

and

is

being

drawn

closer

to

fabric

by

movement

of

looper,

assisted

by

the

raising

of

needle

bar.

Fig.

8

shows

the

completed

stitch.

The

loop

of

the

stitch

in

process

is

drawn

down

to

its

fullest

extent

by

looper.

The

preceding

stitch

has

been

drawn

closely

againstthe

underside

of

fabric

and

is

com-

pleted,

the

needle

bar

having

reached

its

highest

point.

TO

REGULATE

TENSION

ON

THREAD

l

d

Tension

on

thread,

=

once

regulated,

seldom

re-

quires

changing.

The

thread

nipper

spring

B,

Fig.

9

is

automat-

.

Jcally

controlled

by

needle

-

bar

lever

at

C,

Fig.

9.

The

nipper

is

opened

just

be-

fore

needle

bar

reaches

its

highest

point

and

remains

open

until

needle

bar

has

drawn

off

sufficient

thread

for

next

stitch.

The

thread

nipper

should

open

to

approxi-

mately

1/32"

when

needle

bar

is

at

its

highest

point.

Fig.

9.

To

Regulate

Tension

If

puckering

or

thread

breakage

occurs

at

light

tension

settings,

raise

needle

bar

to

highest

point

and

check

nipper

opening.

If

neces-

sary,

reshape

contact

finger

of

nipper

so

that

correct

opening

is

obtained.

If

stitches

are

so

tight

that

they

pucker

material,

decrease

tension

by

turning

thumb

nut

E,

Fig.

9

over

to

the

left

(counter-clockwise).

If

stitches

are

too

loose,

increase

tension

by

turning

thumb

nut

E

over

to

the

right

(clockwise).

Note:—lf

thread

bearing

surfaces

are

rusted,

they

should

be

replaced.

TO

REGULATE

LENGTH

OF

STITCH

The

length

of

stitch

is

regulated

by

lever

F,

Fig.

10.

For

a

longer

stitch,

move

lever

F

down

away

from

operator.

For

a

shorter

stitch,

move

lever

F

up

toward

operator.

Fig.

10.

To

Regulate

Length

of

Stitch

TO

TIME

FEED

AND

LOCATE

FEED

ECCENTRIC

AND

LOOPER

NOTE:

If

screw

L

is

loosened,

all

adjustments

(timing

feed

and

locating

feed

eccentric

and

looper)

must

be

made

as

instructed

below.

Fig.

11.

Timing

the

Feed

To

time

feed,

turn

hand

wheel

over

away

from

operator

until

looper

point

is

centered

with

needle,

as

shown

at

M,

Fig.

11.

Loosen

set

screw

L,

Fig.

11

and

turn

feed

eccentric

K

so

that

screw

L

is

in

position

shown

in

Fig.

11.

To

locate

feed

eccentric

K,

hold

pinion

gear

Q,

Fig.

17

against

machine

and

adjust

feed

eccentric

K

for

a

slight

amount

of

clearance

(not

to

exceed

.003

inch,)

as

shown

in

Fig.

11A.

Do

not

tighten

screw

L

at

this

time.

To

locate

looper

R,

move

looper

as

close

to

needle

as

possible

as

shown

at

D,

Fig.

11A,

and

then,

after

all

adjust-

ments

have

been

made

as

instructed

above,

tighten

set

screw

L,

Fig.

11.

Re-

check

adjustments.

Fig.

11A.

Locating

Feed

Eccentric

and

Looper

TUse

.003

Feeler

Gauge

Serial

187928

Complete.

>

TO

REMOVE

AND

REPLACE

CLOTH

PLATE

To

remove

cloth

plate

U,

Fig.

12,

first

remove

thumb

screw

T

and

cloth

guide

Y.

Raise

presser

bar

and

needle

bar

to

highest

points.

Remove

screws

Z.

Lift

cloth

plate

slightly

at

U

(to

clear

feed

dog)

and

slide

it

out

between

presser

foot

and

feed

dog.

mar

To

replace,

raise

presser

bar

and

needle

bar

to

high-

est

points.

Pass

cloth

plate

between

presser

foot

and

feed

dog,

fit

cloth

plate

slots

over

feed

dog

teeth

and

replace

cloth

plate

screws

Z.

Replace

cloth

guide

Y

and

thumb

screw

T.

Fig.

12.

Removing

and

Replacing

Cloth

Plate

TO

REMOVE

AND

REPLACE

LOOPER

CAUTION:

When

removing

looper,

needle

must

be

high

enough

for

looper

to

pass

without

striking

needle.

To

remove

looper

R,

turn

hand

wheel

over

away

from

operator

until

set

screw

L

is

in

approximate

position

shown

in

Fig.

13.

Loosen

screw

L

and

remove

looper

R

from

end

of

looper

shaft

S.

Fig.

13.

Removing

Looper

To

replace

looper,

turn

hand

wheel

until

needle

bar

is

at

its

highest

point.

Fit

looper

R

(point

down)

into

slot

in

looper

shaft

S.

Time

feed

and

locate

feed

eccentric

K

and

looper

R,

as

instructed

on

page

9.