Singer 620 User manual

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1

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SINGER

CLASSES

620,

625,

626

AND

628

Supplement

to

Form

20732

.

Machines

620,

625,

626

and

628

'

(1066)

SINGER

SERVICE

MANUAL

MACHINES

OF

CLASSES

620,

625,

626

AND

628

Instructions

appearing

in

the

Service

Manual

for

Machines

of

Class

600

generally

apply

to

Machines

of

Classes

620,

625

and

626.

Instructions

for

Class

603

Machines

generally

apply

to

those

of

Class

628.

This

supplement

provides

instructions

which

apply

only

to

Class

620

625

626

and

628

Machi

nes.

THE

SINCER

COMPANY

*

A

Trademark

of

THE

SINGER

COMPANY

Insert

in

Form

20732,

Swing

Needle

Service

Manual

Printed

in

U.

S.

A,

INDEX

Bobbin

Driver

Adjustment....

Removal

and

Replacement..—.

Bobbin

Push-Button

Removal

and

Replacement__—.---

Chainstitch

Adjustments.........

Hinge

Assembly...-.

Hoolc,

Rotating

Positioning...-.

Removal.

Replacing...-.

Timing...

Inspection

and

Lubrication...—.....

Needle-Threader

Storage

and

Use...

Selector

Systems

Release

Mechanism..

.

....—-

The

Cam

Stack...-.-

Bight-Amplitude

and

Pattern

Selector.

Needle-Bar

Driving

Arm.

Tension,

Needle

Thread

Adjustment.

Removal

and

Disassembly.

Reassembly

and

Reolacement.

Throat-Plate

Position

Bracket

Remove

i

ana

R

ss

icc

oment.

Winding

Mechanism.

•Viring

Dicgram.

9

9

9

20

5

8

6

6

7

3

22

12

14

17

19

10

10

10

PROPERTY

OF

THE

SINGER

COMPANY

This

is

a

private

and

confidential

communication

to

and

for

the

use

only

of

the

employees

of

The

Singer

Company

and

its

affiliated

companies.

Reproduction,

sale,

distribution,

or

publication

thereof

to

the

public

is

forbidden.

2

INSPECTION

AND

LUBRICATION

Before

any

extensive

inspection

is

undertaken

to

find

causes

of

faulty

operation,

the

machine

should

be

thoroughly

cleaned

and

lubricated.

Remove

lint,

fluff,

dust

or

other

foreign

particles

from

the

hook,

feed

dog,

and

bobbin

case.

Remove

bobbin

case

and

clean

in

varsol.

Open

face

plate

and

clean

out

lint

or

waste

collected

around

needle

bar,

presser

bar,

and

pressure

regulator.

CLASS

620,

625

and

628

MACHINES

Remove

arm

too

cover

by

opening

stitch

chart,

re¬

moving

screw,

and

sliding

top

cover

toward

left

and

off

the

machine.

Remove

arm

top

cover

by

removing

the

two

screws

and

lifting

cover

from

machine.

Lay

machine

on

back,

loosen

screws

from

the

four

corners

of

the

machine-bed

cover,

and

remove

cover

from

underside

of

machine.

Wipe

out

any

oil

or

grease

accumulated

inside

arm-toD

and

bed

covers.

Oil

machine

as

indicated

below,

and

on

pages

3,

4

and

5

for

specific

class

of

machine.

Apply

one

drop

of

oil

between

the

casting

and

the

bobbin

push-button

release

lever.

CLASS

626

MACHINES:

This

class

of

machine,

supplied

only

for

use

with

the

standard

cam

stack,

does

not

require

the

access

means

provided

by

the

hinged

top

cover.

Ac¬

cordingly,

the

following

instructions

do

not

apply

to

Class

626

Machines.

Removal

Remove

top

cover

from

machine

as'described

on

page

3.

Remove

the

two

self-tapping

screws

on

underside

of

cover

holding

bracket

to

cover.

Remove

holding

ring

from

top

lid.

Remove

stitch

indicator

chart

from

lid.

Remove

self-tapping

screws

in

lid,

disengaging

hinge.

Replacement

Fasten

new

hinge

in

lid

with

self-tapping

screws.

Replace

stitch

indicator

in

top

lid

and

secure

it

with

the

holding

ring-

Replace

self-tapping

screws

through

bracket.

Do

NOT

tighten

securely.

Loosen

adjustment

screws

in

bracket.

Adjust

lid

so

that

it

is

flush

with

top

cover.

(This

is

done

by

raising

and

lowering

the

lid

on

the

slots

provided

in

the

bracket

while

the

adjustment

screws

are

loose,

and

by

adjusting

it

to

the

left

or

right

while

the

self-tapping

screws

are

loose

in

the

over-

sized

holes.)

When

lid

is

correctly

fitted,

tighten

the

self-tapoing

screws

and

the

adjustment

screws

in

the

bracket.

Replace

cover

and

secure

it

with

two

cover

screws.

THE

ROTATING

HOOK

VERTICAL

GEAR

Removal

CAUTION:

Hook-shaft

gears

and

hand-wheel

gea»

may

be

removed

to

facilitate

adjustments.

DO

NOT

DISTURB

THE

MESH

OF

ANY

OTHER

GEAR

IN

THIS

MACHINE.

All

other

gears

are

mated

and

cor¬

rectly

timed.

Replacements

should

be

made

only

at

the

factory.

Remove

needle,

presser

foot,

throat

plate,

bed

slide,

bobbin

case,

feed

dog,

cushion-spring

bracket,

and

position

finger.

Remove

bed

cover.

Remove

feed-1

iftinq

rock-shaft

and

feed

rock-

shaft

with

pull-off

finger

as

instructed

on

page

25,

Service

Manual

for

Classes

600

and

603

Machines.

Remove

actuating

lever

and

bobbin

driver

as

in¬

structed

on

page

9.

With

chalk

or

crayon,

mark

the

two

bevel

gears

as

illustrated.

(Mark

one

tooth

of

one

gear,

and

the

corresponding

space

for

that

tooth

in

the

other

gear.)

This

assures

proper

mesh

when

replacing.

Loosen

set

screw

in

vertical

bevel

gear,

and

re¬

move

gear

from

hook

shaft.

Lift

rotating

hook

assembly

from

machine.

Replacement

InstalI

rotating-hook

assembly

into

machine.

Using

the

guide

marks

previous

ly

made,

mesh

vertical

bevel

gear

with

horizontal

bevel

gear.

Turn

vertical

hook-

shaft

until

flat

side

of

shaft

is

under

set

screw

in

bevel

gear,

and

tighten

set

screw

securelv.

Replace

bobbin

driver

and

actuating

lever,

as

instructed

on

page

9.

Insert

pull-off

finger

into

machine

and

reoiace

feed

rock-shaft

and

feed-lifting

rock-shatt

as

in¬

structed

on

page

25,

Service

Manual

for

v-lasses

600

and

603

Machines

Check

and

adjust

hook

as

instructed

on

pages

7

and

3.

Replace

all

other

parts

previously

instructed

for

removal,

except

in

reverse

order.

6

To

Time

the

Hook

Sot

noodle

bar

at

correct

height,

and

time

the

needle-bar

vibrating

mechanism

as

instructed

on

pages

7

and

8,

Service

Manual

for

Classes

600

and

603

Machines.

Insert

a

Size

18

needle

up

into

the

needle

clamp.

Remove

throat

plate,

bed

slide,

bobbin

case,

and

bottom

cover.

It

is

not

necessary

to

remove

the

feed

dog

to

time

the

hook.

Adjust

machine

for

straight

stitching

in

center

needle

position.

Turn

hand

wheel

over

toward

operator

until

lower

timing

mark

is

aligned

with

lower

edge

of

needle-

bar

bushing

on

UPWARD

STROKE

of

needle

bar.

At

this

position,

point

of

hook

should

be

at

center

of

needle

as

illustrated.

To

adjust,

loosen

the

two

set

screws

in

horizontal

bevel

gear.

While

maintaining

position

of

needle

bar,

turn

vertical

bevel

gear

at

hook-end

of

shaft

until

point

of

hook

is

in

correct

position.

Then

tighten

the

two

bevel-gear

set

screws

securely,

making

cer¬

tain

that

gears

are

correctly

meshed

without

binding.

CAUTION:

Hub

of

horizontal

bevel

gear

should

not

contact

face

of

bushing.

Replace

throat

plate,

slide

plate,

bobbin

case,

and

bottom

cover.

VERTICAL

BEVEL

SETSCREWS

HCRIZONTAL

3

EV

EL

\

SEAR

GEAR

HUB

SHOULD

HOT

CONTACT

FACE

OF

BUSHING

7

To

Position

Hook

to

or

from

Needle

Set

needle

bar

at

correct

height,

and

time

the

hook

as

previously

instructed.

Turn

hand

wheel

until

point

of

hook

is

directly

behind

needle.

When

correctly

set,

the

distance

be¬

tween

the

needle

and

hook-point

should

be

approx¬

imately

0.004

inch,

as

illustrated.

HOOK

POINT

SETTING:

With

bobbin

push-button

in

winding

position,

remove

locator

nut

by

turning

in

a

CLOCK¬

WISE

direction.

Remove

bobbin

push-button

assembly

(see

instructions

on

poge

9),

and

remove

locator.

Careful

ly

mark

the

two

bevel

gears,

as

illustrated,

to

assure

proper

meshing

of

gears

when

replacing.

Then

loosen

set

screw

in

vertical

hook-shaft

bevel-

gear

and

remove

gear

from

shaft.

Loosen

set

screw

holding

the

eccentric

bushing.

Turn

the

eccentric

bushing

while

maintaining

posi¬

tion

of

hook,

until

correct

distance

between

needle

and

point

of

hook

is

attained.

Replace

bevel-gear

using

the

previously-made

guide

marks

to

assure

correct

meshing

of

gears.

Replace

all

other

parts

in

reverseorder

instructed

for

removal.

Set

winding

mechanism

as

instructed

on

page

9.

CAUTION:

Check

for

binding

or

end

play

in

hook

dri

ving-s

haft.

F

or

adjustment

and

removal,

see

page

24

of

Service

Manual

for

600

and

603

Machines,

and

page

6

of

this

supplement

for

removal

of

hook.

s

WINDING

MECHANISM

Bobbin

Push-Button

Assembly

Removal

and

Replacement

Open

slide

plate.

Place

push-button

irr

winding

position.

Lay

machine

on

back

and

remove

bed

cover

from

machine.

Remove

locator

nut

from

bobbin

driver

by

turning

in

a

CLOCKWISE

direction.

Then

remove

the

two

screws

fastening

the

push-button

assembly

to

the

underside

of

the

bed.

Slide

assembly

out

as

a

complete

unit,

being

careful

not

to

bend

the

push¬

button

release

lever.

To

replace,

follow

the

same

directions

as

for

removal,

except

in

reverse

order.

Bobbin

Driver

Removal

and

Replacement

Teen

slide

aiaTe.

Remove

‘hroat

plate,

bobbin

cose,

one

;ea

cover.

Per

stitch

enern

seiecrcr

ct

p

•r.'cnes

oer

nen,

one

-pm

non

a

-vneei

jnri:

eec

cog.

is

m

its

extreme

'ear

oosinon.

Remove

iocaror

nut,

pusn-button

assembly,

and

locator.

Then

slide

bobbin

driver

up,

rotate

until

apron

is

opposite

feed

dog,

and

lift

out

of

machine.

To

replace,

install

bobbin

driver

in

machine,

ro¬

tating

it

until

it

seats

firmly

into

place.

Then

replace

locator,

push-button

assembly,

locator

nut,

throat

piate,

and

bobbin

case.

Adjustment

To

adjust

the

height

of

the

bobbin

driver,

place

push-button

in

winding

position

and

loosen

adjustable

extension

screw

at

end

of

lifting

bracket.

Press

up¬

ward

on

bracket

until

bobbin

rises

slightly

above

top

of

bobbin

case.

Then

release

upward

pressure

slight¬

ly,

allowing

bobbin

to

seat

correctly

into

bobbin

case.

Without

disturbing

this

setting,

tighten

ex¬

tension

screw

securely

9