Singer 620 Bedienungsanleitung

SINGER

CLASSES

620,

625,

626

AND

628

Supplement

Form

20732

Machines

620,

625,

626

and

628

(1066)

SINGER

SERVICE

MANUAL

MACHINES

CLASSES

620,

625,

626

AND

628

Instructions

appearing

the

Service

Manual

for

Machines

Class

600

generally

apply

Machines

Classes

620,

625

and

626.

Instructions

for

Class

603

Machines

generally

apply

those

Class

628.

This

supplement

provides

instructions

which

apply

only

Class

620

625

626

and

628

Machi

nes.

THE

SINCER

COMPANY

Trademark

THE

SINGER

COMPANY

Insert

Form

20732,

Swing

Needle

Service

Manual

Printed

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

ana

icc

oment.

Winding

Mechanism.

•Viring

Dicgram.

PROPERTY

THE

SINGER

COMPANY

This

private

and

confidential

communication

and

for

the

use

only

the

employees

The

Singer

Company

and

its

affiliated

companies.

Reproduction,

sale,

distribution,

publication

thereof

the

public

forbidden.

INSPECTION

AND

LUBRICATION

Before

any

extensive

inspection

undertaken

find

causes

faulty

operation,

the

machine

should

thoroughly

cleaned

and

lubricated.

Remove

lint,

fluff,

dust

other

foreign

particles

from

the

hook,

feed

dog,

and

bobbin

case.

Remove

bobbin

case

and

clean

varsol.

Open

face

plate

and

clean

out

lint

waste

collected

around

needle

bar,

presser

bar,

and

pressure

regulator.

CLASS

620,

625

and

628

MACHINES

Remove

arm

too

cover

opening

stitch

chart,

re¬

moving

screw,

and

sliding

top

cover

toward

left

and

off

the

machine.

Remove

arm

top

cover

removing

the

two

screws

and

lifting

cover

from

machine.

Lay

machine

back,

loosen

screws

from

the

four

corners

the

machine-bed

cover,

and

remove

cover

from

underside

machine.

Wipe

out

any

oil

grease

accumulated

inside

arm-toD

and

bed

covers.

Oil

machine

indicated

below,

and

pages

and

for

specific

class

machine.

Apply

one

drop

oil

between

the

casting

and

the

bobbin

push-button

release

lever.

CLASS

626

MACHINES:

This

class

machine,

supplied

only

for

use

with

the

standard

cam

stack,

does

not

require

the

access

means

provided

the

hinged

top

cover.

Ac¬

cordingly,

the

following

instructions

not

apply

Class

626

Machines.

Removal

Remove

top

cover

from

machine

as'described

page

Remove

the

two

self-tapping

screws

underside

cover

holding

bracket

cover.

Remove

holding

ring

from

top

lid.

Remove

stitch

indicator

chart

from

lid.

Remove

self-tapping

screws

lid,

disengaging

hinge.

Replacement

Fasten

new

hinge

lid

with

self-tapping

screws.

Replace

stitch

indicator

top

lid

and

secure

with

the

holding

ring-

Replace

self-tapping

screws

through

bracket.

NOT

tighten

securely.

Loosen

adjustment

screws

bracket.

Adjust

lid

that

flush

with

top

cover.

(This

done

raising

and

lowering

the

lid

the

slots

provided

the

bracket

while

the

adjustment

screws

are

loose,

and

adjusting

the

left

right

while

the

self-tapping

screws

are

loose

the

over-

sized

holes.)

When

lid

correctly

fitted,

tighten

the

self-tapoing

screws

and

the

adjustment

screws

the

bracket.

Replace

cover

and

secure

with

two

cover

screws.

THE

ROTATING

HOOK

VERTICAL

GEAR

Removal

CAUTION:

Hook-shaft

gears

and

hand-wheel

gea»

may

removed

facilitate

adjustments.

NOT

DISTURB

THE

MESH

ANY

OTHER

GEAR

THIS

MACHINE.

All

other

gears

are

mated

and

cor¬

rectly

timed.

Replacements

should

made

only

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

instructed

page

25,

Service

Manual

for

Classes

600

and

603

Machines.

Remove

actuating

lever

and

bobbin

driver

in¬

structed

page

With

chalk

crayon,

mark

the

two

bevel

gears

illustrated.

(Mark

one

tooth

one

gear,

and

the

corresponding

space

for

that

tooth

the

other

gear.)

This

assures

proper

mesh

when

replacing.

Loosen

set

screw

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

made,

mesh

vertical

bevel

gear

with

horizontal

bevel

gear.

Turn

vertical

hook-

shaft

until

flat

side

shaft

under

set

screw

bevel

gear,

and

tighten

set

screw

securelv.

Replace

bobbin

driver

and

actuating

lever,

instructed

page

Insert

pull-off

finger

into

machine

and

reoiace

feed

rock-shaft

and

feed-lifting

rock-shatt

in¬

structed

page

25,

Service

Manual

for

v-lasses

600

and

603

Machines

Check

and

adjust

hook

instructed

pages

and

Replace

all

other

parts

previously

instructed

for

removal,

except

reverse

order.

Time

the

Hook

Sot

noodle

bar

correct

height,

and

time

the

needle-bar

vibrating

mechanism

instructed

pages

and

Service

Manual

for

Classes

600

and

603

Machines.

Insert

Size

needle

into

the

needle

clamp.

Remove

throat

plate,

bed

slide,

bobbin

case,

and

bottom

cover.

not

necessary

remove

the

feed

dog

time

the

hook.

Adjust

machine

for

straight

stitching

center

needle

position.

Turn

hand

wheel

over

toward

operator

until

lower

timing

mark

aligned

with

lower

edge

needle-

bar

bushing

UPWARD

STROKE

needle

bar.

this

position,

point

hook

should

center

needle

illustrated.

adjust,

loosen

the

two

set

screws

horizontal

bevel

gear.

While

maintaining

position

needle

bar,

turn

vertical

bevel

gear

hook-end

shaft

until

point

hook

correct

position.

Then

tighten

the

two

bevel-gear

set

screws

securely,

making

cer¬

tain

that

gears

are

correctly

meshed

without

binding.

CAUTION:

Hub

horizontal

bevel

gear

should

not

contact

face

bushing.

Replace

throat

plate,

slide

plate,

bobbin

case,

and

bottom

cover.

VERTICAL

BEVEL

SETSCREWS

HCRIZONTAL

SEAR

GEAR

HUB

SHOULD

HOT

CONTACT

FACE

BUSHING

Position

Hook

from

Needle

Set

needle

bar

correct

height,

and

time

the

hook

previously

instructed.

Turn

hand

wheel

until

point

hook

directly

behind

needle.

When

correctly

set,

the

distance

be¬

tween

the

needle

and

hook-point

should

approx¬

imately

0.004

inch,

illustrated.

HOOK

POINT

SETTING:

With

bobbin

push-button

winding

position,

remove

locator

nut

turning

CLOCK¬

WISE

direction.

Remove

bobbin

push-button

assembly

(see

instructions

poge

9),

and

remove

locator.

Careful

mark

the

two

bevel

gears,

illustrated,

assure

proper

meshing

gears

when

replacing.

Then

loosen

set

screw

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

hook,

until

correct

distance

between

needle

and

point

hook

attained.

Replace

bevel-gear

using

the

previously-made

guide

marks

assure

correct

meshing

gears.

Replace

all

other

parts

reverseorder

instructed

for

removal.

Set

winding

mechanism

instructed

page

CAUTION:

Check

for

binding

end

play

hook

dri

ving-s

haft.

adjustment

and

removal,

see

page

Service

Manual

for

600

and

603

Machines,

and

page

this

supplement

for

removal

hook.

WINDING

MECHANISM

Bobbin

Push-Button

Assembly

Removal

and

Replacement

Open

slide

plate.

Place

push-button

irr

winding

position.

Lay

machine

back

and

remove

bed

cover

from

machine.

Remove

locator

nut

from

bobbin

driver

turning

CLOCKWISE

direction.

Then

remove

the

two

screws

fastening

the

push-button

assembly

the

underside

the

bed.

Slide

assembly

out

complete

unit,

being

careful

not

bend

the

push¬

button

release

lever.

replace,

the

same

directions

for

removal,

except

reverse

order.

Bobbin

Driver

Removal

and

Replacement

Teen

slide

aiaTe.

Remove

‘hroat

plate,

bobbin

cose,

one

;ea

cover.

Per

stitch

enern

seiecrcr

•r.'cnes

oer

nen,

one

-pm

non

-vneei

jnri:

eec

cog.

its

extreme

'ear

oosinon.

Remove

iocaror

nut,

pusn-button

assembly,

and

locator.

Then

slide

bobbin

driver

up,

rotate

until

apron

opposite

feed

dog,

and

lift

out

machine.

replace,

install

bobbin

driver

machine,

ro¬

tating

until

seats

firmly

into

place.

Then

replace

locator,

push-button

assembly,

locator

nut,

throat

piate,

and

bobbin

case.

Adjustment

adjust

the

height

the

bobbin

driver,

place

push-button

winding

position

and

loosen

adjustable

extension

screw

end

lifting

bracket.

Press

up¬

ward

bracket

until

bobbin

rises

slightly

above

top

bobbin

case.

Then

release

upward

pressure

slight¬

ly,

allowing

bobbin

seat

correctly

into

bobbin

case.

Without

disturbing

this

setting,

tighten

ex¬

tension

screw

securely

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