Singer CLASS 20 User manual

20533

ADJUSTERS

MANUAL

SINGER

SEWING

MACHINES

CLASS

SINGLE

THREAD

CHAIN

STITCH

THE

SINGER

MANUFACTURING

COMPANY

A.,

1936,

1952

and

1954,

The

Singer

Manufacturing

Company

All

Rights

Reserved

for

all

Countries

Trade

Mark

THE

SINGER

MANUFACTURING

COMPANY

rom-mo

n»

£22788

Fig.

Principal

Parts

Machine

20-10

Thread

Hole

Tension

Clamp

Screw

Bracket

Stitch

Regulator

Tension

Discs

Looper

Tension

Regulating

Cloth

Plate

Thumb

Nut

Presser

Foot

Thread

Nipper

©.

Cloth

Guide

Thumb

Screw

Spool

45P.

Cloth

Guide

Thread

Pull

Off

Needle

Set

Screw

Hand

Wheel

Presser

Bar

Lifter

Driving

Handle

Presser

Bar

Needle

Bar

Clamp

DESCRIPTION

Machines

Class

are

practical,

convenient,

single

thread

chain

stitch

sewing

machines

made

especially

for

children.

They

may

also

used

adults

for

repairing

clothes

and

light

household

articles.

Machines

20-1

and

20-10

are

operated

manually.

Machine

20-2

operated

motor,

although

too

can

operated

manually

removing

motor

and

attaching

handle

hand

wheel.

All

Machines

Class

have

cloth

guide

for

use

when

sewing

edge

material.

The

rotary

looper

makes

one

revolution

per

stitch.

The

needle

threaded

from

left

right.

arm

side

cover

encloses

movable

parts

arm

Machine

20-10.

clamp,

for

fastening

machine

table

desk,

furnished

with

all

Machines

Class

20.

All

electrical

parts

motor

Machine

20-2

are

enclosed

bakelite

shell,

eliminating

the

danger

electrical

shock.

The

motor

requires

attention

except

occasional

oiling.

must

used

only

110

volt,

cycle,

alternating

current

(A.

C.).

PREPARE

MACHINE

FOR

SEWING

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

tacky,

anti-rust

oil

used

protect

polished

and

plated

surfaces.

Oil

machine

completely.

See

page

14.

Wipe

away

any

surplus

cil.

Check

condition

needle

before

making

sewing

tests.

See

item

top

page

15.

Check

timing

feed

and

position

looper

relation

needle.

See

page

Check

looper

shaft

for

correct

amount

end

play.

See

page

Check

hand

wheel

for

correct

amount

end

play.

See

page

13.

Glazed

cotton

thread

recommended

for

improved

sewing

results.

10.

Sew-in

machine

and

check

stitching.

See

page

DESCRIPTION

24X

NEEDLES

Needles

for

Machines

Class

are

Class

and

Variety

Sizes

11,

and

16.

The

size

needle

used

depends

upon

the

size

the

thread

which

must

pass

freely

through

eye

needle.

—

iae

not

use

rough

uneven

thread

which

passes

with

difficulty

through

needle

eye,

such

thread

will

interfere

with

the

successful

use

the

machine.

Although

needles

are

made

with

different

diameter

blades,

certain

dimensions

remain

constant

for

all

needles

the

same

Class

and

Variety.

FLAT

SIDE

BLADE

SHANK

-L——

£20961

NEEI

Fig.

Needle

Distances

For

example,

the

distance

between

the

short-grooved

side

needle

blade

and

the

position

the

flat-side

the

needle

shank,

seated

needle

bar,

constant,

maintaining

identical

relation-

ship

between

short-groove

side

all

needles

and

looper

point.

Therefore,

any

increase

diameter

blade

results

shifting

only

the

centerline

needle

blade

away

from

looper

point.

Another

constant

distance

from

end

shank

top

eye,

maintaining

identical

relationship

between

needle

eye

and

looper

point,

during

formation

thread

loop.

However,

the

size

needle

eye

increases

with

the

size

needle

accommodate

heavier

thread.

Therefore,

any

increase

the

length

needle

made

from

the

top

the

needle

eye

toward

the

point

the

needle.

HOW

CHECK

NEEDLE

FOR

STRAIGHTNESS

Plaċe

flat

side

needle

cloth

plate

any

other

flat

solid

surface

PER

and

hold

light,

shown

Fig.

3A.

straight

needle

will

show

even

amount

light

under

and

point

will

line

with

shank.

Fig.

3A.

Checking

Needle

SET

NEEDLE

BAR

Turn

hand

wheel

over

MOVE

away

from

operator

until

ONT

needle

bar

reaches

its

high-

est

point.

Loosen

needle

set

screw

Fig.

With

flat

side

needle

the

right,

INSERT

Baza

;

NEEDLE

shown

Fig.

insert

FAR

needle

into

needle

bar

POSSIBLE

far

will

and

tighten

set

screw

Fig.

Setting

the

Needle

FORMATION

SINGLE

THREAD

CHAIN

STITCH

NEEDLE

LOOPER

Fig.

Looper

Entering

Fig.

Loop

Being

Carried

Loop

Needle

Thread

Through

Loop

Fig.

shows

the

first

stage

stitch

formation.

The

needle,

after

descending

its

lowest

point,

has

been

slightly

raised

and

loop

thread

thus

formed

which

immediately

entered

point

looper

and

carried

into

the

preceding

loop.

Fig.

shows

the

second

stage.

The

loop

thread

being

car-

ried

point

looper

down

through

preceding

loop.

The

heel

looper

about

release

preceding

loop.

FORMATION

SINGLE

THREAD

CHAIN

STITCH

(Continued)

LEED

ESE

LOOPER

Fig.

Loop

Enlarged

and

Fig.

Loop

Further

Enlarged

Loop

Drawn

and

Loop

Completed

Fig.

shows

the

third

stage.

The

loop

further

enlarged

the

downward

movement

point

looper.

The

preceding

loop

has

been

released

and

being

drawn

closer

fabric

movement

looper,

assisted

the

raising

needle

bar.

Fig.

shows

the

completed

stitch.

The

loop

the

stitch

process

drawn

down

its

fullest

extent

looper.

The

preceding

stitch

has

been

drawn

closely

againstthe

underside

fabric

and

com-

pleted,

the

needle

bar

having

reached

its

highest

point.

REGULATE

TENSION

THREAD

Tension

thread,

once

regulated,

seldom

re-

quires

changing.

The

thread

nipper

spring

Fig.

automat-

Jcally

controlled

needle

bar

lever

Fig.

The

nipper

opened

just

be-

fore

needle

bar

reaches

its

highest

point

and

remains

open

until

needle

bar

has

drawn

off

sufficient

thread

for

stitch.

The

thread

nipper

should

open

approxi-

mately

1/32"

when

needle

bar

its

highest

point.

Fig.

Regulate

Tension

puckering

thread

breakage

occurs

light

tension

settings,

raise

needle

bar

highest

point

and

check

nipper

opening.

neces-

sary,

reshape

contact

finger

nipper

that

correct

opening

obtained.

stitches

are

tight

that

they

pucker

material,

decrease

tension

turning

thumb

nut

Fig.

over

the

left

(counter-clockwise).

stitches

are

too

loose,

increase

tension

turning

thumb

nut

over

the

right

(clockwise).

Note:—lf

thread

bearing

surfaces

are

rusted,

they

should

replaced.

REGULATE

LENGTH

STITCH

The

length

stitch

regulated

lever

Fig.

10.

For

longer

stitch,

move

lever

down

away

from

operator.

For

shorter

stitch,

move

lever

toward

operator.

Fig.

10.

Regulate

Length

Stitch

TIME

FEED

AND

LOCATE

FEED

ECCENTRIC

AND

LOOPER

NOTE:

screw

loosened,

all

adjustments

(timing

feed

and

locating

feed

eccentric

and

looper)

must

made

instructed

below.

Fig.

11.

Timing

the

Feed

time

feed,

turn

hand

wheel

over

away

from

operator

until

looper

point

centered

with

needle,

shown

Fig.

11.

Loosen

set

screw

Fig.

and

turn

feed

eccentric

that

screw

position

shown

Fig.

11.

locate

feed

eccentric

hold

pinion

gear

Fig.

against

machine

and

adjust

feed

eccentric

for

slight

amount

clearance

(not

exceed

.003

inch,)

shown

Fig.

11A.

not

tighten

screw

this

time.

locate

looper

move

looper

needle

possible

shown

Fig.

11A,

and

then,

after

all

adjust-

ments

have

been

made

instructed

above,

tighten

set

screw

Fig.

11.

Re-

check

adjustments.

Fig.

11A.

Locating

Feed

Eccentric

and

Looper

TUse

.003

Feeler

Gauge

Serial

187928

Complete.

REMOVE

AND

REPLACE

CLOTH

PLATE

remove

cloth

plate

Fig.

12,

first

remove

thumb

screw

and

cloth

guide

Raise

presser

bar

and

needle

bar

highest

points.

Remove

screws

Lift

cloth

plate

slightly

(to

clear

feed

dog)

and

slide

out

between

presser

foot

and

feed

dog.

mar

replace,

raise

presser

bar

and

needle

bar

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

Replace

cloth

guide

and

thumb

screw

Fig.

12.

Removing

and

Replacing

Cloth

Plate

REMOVE

AND

REPLACE

LOOPER

CAUTION:

When

removing

looper,

needle

must

high

enough

for

looper

pass

without

striking

needle.

remove

looper

turn

hand

wheel

over

away

from

operator

until

set

screw

approximate

position

shown

Fig.

13.

Loosen

screw

and

remove

looper

from

end

looper

shaft

Fig.

13.

Removing

Looper

replace

looper,

turn

hand

wheel

until

needle

bar

its

highest

point.

Fit

looper

(point

down)

into

slot

looper

shaft

Time

feed

and

locate

feed

eccentric

and

looper

instructed

page

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