Pfaff 238, 238-0 Service Manual

PFAFF

238 238-0

I

Instruction

and

Service

Book

Manual

R

9030

/ hphee ^

(

PFAFF)

238

238-0

High-Speed

Organized and

transverse

Zigzag

with

instruction

and

Service

Sewing

iink

take-up

rotary

hook

Manuai

Machine

Book

G-MPFAFFAG-KAISERSLAUTERN

BRANCH

Foreword

This

Instruction

high-speed

of

answering

on

the

construction,

interested

as

possible.

The

instructions

be

much

appreciated

the

best serviced instructions to which

by an

affordabetter

you

book

contains

zigzag

all

questions

sewing

machines.

relatedtosewing

function

and

operatortogettoknow

for

mechanics

by all

maintenance

sewing

machine

expert.

as

simpleaspossiblle

We

will

have

understanding.

may

wishtomake.

much

vaiuable

Though

not

exhaustively, it offers sufficient information

operationofthe

her

machine

containedinthe

men

work

satisfactorily

made

every

and

have

We

welcome

Information

intendedasa

various

and

attain

maximum

second

servicing

only

partofthis

our

if it is

efforttorender

included

any

numerous

suggestions

about

Pfaff

238

and

full-scale

textbook

mechanismstoenable

efficiencyasquickly

book

willnodoubt

sewing

machines

employed

the

presentationofthese

properly

since

illustrationsinorder

and

recommendations

238-0

capable

every

even

and

G.M.PFAFF

AG

Instructions

1.

Brief

Descriptionofthe

The

Pfaff 238

which has been redesigned to match

ward

appearance

for

high-speed

and

Operators

Pfaff

238

zigzag sewing machine Is an Improved version of

our

modern high-speed straight stitchers In out

sewing

performance.

the

Pfaff 138

Like the Pfaff 138, It Is organized with link take-up and transverse rotary sewing hook which features a special balancing collar In order to

The Pfaff 238 Is supplied in Models A

stitches

The

Model B machines

speedof3,500

If

about

As a

per

Inch.

permissible

desired,

top

s.p.m.

Model B

speedofthe

are

normally fitted for a stitch width of 11/64", or 4.5 mm, and a

machines

'A", or 6.0 mm, and maximum

special

variety,

the

can

Pfaff

width of 5/32" and a sustained

and

machine

be fitted with a

speed

238

can

be

speed

of 3,800 s.p.m.

B for a maximum stitch length of down to 7

depends

of 3,200 s.p.m.

suppliedInModelAforamaximum

ensure

on

special

vibratlonless running.

the

model

and

parts

set

for a stitch width of

the

stitch

width.

top

stitch

2.

Setting

In

power

most

Up

Instanoes,

table

are

the

Machine

the

packed

Pfaff 238 Is

The machine Is driven by a

suit

local

requirements.)

PowerIstransmitted

or

10 mm,

When and

The

as

mayberequired.

The

table

wide

connected

when

connected

motor

pulley

relationship

below:

from

and

conformingtoGerman

to a

50-cycle

to a

canbeeasily

between

separately.

Va-HP

the

motortothe

power

60-cycle

exchangedInorder

pulley

diameter

supplied

for Individual

power

drive.

Sewing

head

and

clutch motor. (Type of current and voltage optional to

sewing

supply,

power

supply,at3,400 r.p.m.

and

machinebymeans

DIN 2215

the

motor

to vary

maximum

standards.

runsata

the

sewing

of a V-belt 25/64",

speed

of 2,800 r.p.m.,

maximum

speedIsIndicatedInthe

sewing

speed,

dm

mm

71

Balance

Whppj

nip.

D

mmdmmm

76

Motor

63 68

Motor

D

mm

Speed

Pulley

16-437

Order

No.

2,800

Dia.

010-55

r.p.m.

Stitches

per

Minute

2,500

dm

mm

-

Motor

D

mm

-

Speed

Pulley

-

Dia.

Order

No.

3,400

r.p.m.

Stitdies

per

Minute

71

dfn ~

63

67

68

71

mm

76

effective

=

2.48",

=

2.64",

=

2.67",

=

2.79",

dm

- 0

67

71

75

80

85

90 95

95

100

diameter

72

16-437

020-55

76

16-437

030-55

80

16-437

040-55

85

16-437

050-55

90

16-437

060-55

16-437

070-55

16-437

080-55

72

75

76

80

Fig.

2

mm

= =

=

2,600

2,800

3,000

3,200

3,400

3,600

3,800

0 =

2.83",

2.95",

3.00",

3.15",

- - -

- -

-

68

63

67

72

71

76

75

80

85

outside

diameter

16-437

010-55

16-437

020-55

16-437

030-55

16-437

040-55

16-437

050-55

85

mm=3,35",

90 mm = 3.54",

95 mm =

100

mm=3.94".

-

-•

3,000

3,200

3,400

3.600

3,800

3.74",

Unpack

lid

that the

To

lift

For

the

The

this

the

sewing

from

the

box,

support

dust

facilitate the

adjusting

motor.

and

motor

the

mount

the

machineisdispatched

condition.

head

unscrew

machineinthe

the

machineonthe

mountingofthe

and

pull

the

V-belt

tension,

cautiouslytoavoid

the

wood

screws

box.

Cautiously

tablesothatitrestsonthe

V-belt,

slip

belt

onto

the

motor

please

refertothe

without

oil in

damagetothe

which

hold

lift

the

it on

the

pulley.

instructions

the

reservoir

the

machine

and

machine.

cushioned

outofthe

pulley first.

which

must

not

After

rubber

are

removing

wooden

box,

Then

furnished

be

run

wipe

pads.

while

the

blocks

off

slightly

with

in

3.

The

An

Lubrication

oil

reservoir

System

has been

Incorporated

in the top cover of the

machine

(Figs.

4 &5)

which holds enough oil to ensure adequate lubrication of the arm shaft parts. After pulling out plug C

(Order

No.

280-1-120122)

175

S/es'F

Into

the

The oil in the reservoir

in operation each day.

which can be

Fig. 4 shows the

the lower end of oil wick D which protrudes into hole A and supplies oil to the arm

shaft

center

The

oil

seeps

seen

open

bearing.

throughavent

(Fig.

3),

fill

about 4Vsfl.

or a technical white oil having a viscosity of 150

reservoir.

will

last for a longer time, depending on how long the ma<^ine is

Oil

should be replenished when the red tip of the oil level gauge

through the oil

sight

glass

oz. of ordinary sewing machine oil

emerges

from the

surface

of the oil.

R/68°F

oil reservoir with oil wick, Fig. 5 the bottom of the reservoir with

hole

into

the

hollow

arm

shaft

andisdistributed

inside

the

arm

shaft by a packing. Emerging from additional vent holes, oil is supplied to the various

arm shaft pan and

bearings

accumulates

and the feed eccentric. Dripping oil is collected by a large oil drip

in a detachable plastic oil bottle. (Fig. 6)

or

R

Fig.

7715

3

The

oil

which

has

prior

cleaning.

to filter it

Impair

its

purposes

All

other

oiledbyhand.

Special

to

the

needle

pad

shouldbesoaked

Put

one

quently

underside

After

throughapiece

lubricityinthe as

well.

oiling

points

care

shouldbetakeninapplying

vibrating

drop

of oil

take

off

the

andonthe

particlesofdressing

will

cause

excessive

accumulatedinthis

the

oil

has

circulatedinthe

of linen

least.

Used

which

are

markedbyarrowsinFigs.

with oil

into

needle

feed

which

wear.

eccentric

the

and

regularly.

hook

plate

dog.

Thisisvery

haveanabrasive

bottle

before

oil,

can

raceway

and

maybereturnedtothe

machine

it is

returnedtothe

naturally,

remove

oil to

be

each

the

reached

the

maybeemployed

large

through

day

the

lint

Important

effect

on

several

3, 4, 5, 7

oiling felt

machine

which

because

the

sewing

R

7722

oil

reservoir

times,

it Is

without

advisable

reservoir. This will not

for

other

lubrication

and8havetobe

which

supplies

aperture

has

is in

accumulated

the

lint

hook

F (Fig. 5).

operation.

on

contains

and,intime,

oil

This

Fre

its

small

Fig.

8

10

4.

Test-Running

the

Machine

Before you test-run the machine, carefully remove the rust preventative.

After

the

machine

chine with a

Before you plug the machine

piece

has

been

of fabric

lubricatedasinstructed

under

the

presser

In,

make sure that the voltage indicated on the rating plate

foot.

above,

test-run

the

unthread

ma

of the motor is within the tension range marked on the electric meter.

Also, make sure the machine pulley rotates in the proper direction, i. e. toward you. If

it

does

not, simply

exchange

the two wires at the motor terminals.

R

7685

Fig.

9

11

5.

Removing

Raise

open

and

forefinger,asshown

While

the

you

the

take-up

bobbin

hold

Bobbin

lever

case

the

to its

latch

bobbin

Case

highest

and

in Fig. 9.

case

pull

out

by its

position.

the

open

Reach

bobbin

latch,

under

the

table

casebyholding

the

bobbin

cannot

with

this

your

latch with

fall

out

left

hand,

thumb

(Fig. 10).

R

7432

Fig. 10

6.

Winding

The

(Fig.

This bushing.

The Mount

when Placeanempty

pin1through

a

few

Start

automatically

is

regulatedbyturning

clockwise

If

the

tension

the

Pfaff 238 is

11).

bobbin

winder

winderisstopped

the

bobbin

the

winderisdisengaged.

thread

turns

of

the

bobbin

when

for

less

thread

should

bracket,asappropriate.

Bobbin

equipped

requires

with a bobbin

no

quietly by

winderonthe

bobbinonbobbin

guide2and

thread

on

the

bobbininclockwise

winderbydepressing

the

bobbin

is full.

screw7.Turn

thread.

pile up at

lubrication

tablesothat

winder

clockwise

engaging

The

this

one

endofthe

winder

since

means

which is

of an

its

spindle

adjustable

mountedonthe

its pulley will not

spindle5.Lead

around

direction.

lever6.The

amountofthreadtobe

screw

clockwise

bobbin,

and

the

between

for

loosen

runs

in a

leather

contact

thread

from

tension

bobbin

winder

woundonthe

more

thread,orcounter

screw4and

power

sintered-metal

pad.

the

driving

the

spool

discs3.Wind

will

bobbin

adjust

table

belt

on

stop

the

R

Fig.

6767

m

».

IT

11

^^7

7.

Threading

Insert a full

left

toward

Hoid

the

tension

iatch

points

Press

against

Failure to

the

bobbin

the

bobbin

spring

toward

observe

Bobbin

right

firmly in

the

into

(Fig. 12).

and

the

bobbin

Case

the

bobbin

the

bobbin

into delivery

right

and

case

until you

casesothat

case,

eye

2. Turn

placeiton

hearitsnap

puli

this precaution may result in bobbin

the

center

thread

bobbin

studinthe

into

place.

caseorneedle

drawsonthe

into

slot1and

casesothat

top from

drawitunder

the

bobbin

breakage.

end

case

the

of its

base.

R

4345

Fig.

12

14

8.

Threading

the

machineinthe

the

Pfaff 238 Is

Needle

operator's

simple

because

field of vision.

the

thread

passes

down on

the

front of

As iiiustrated in Fig. 13, lead the thread from the spool on the thread unwinder up and

through

of

tainer check

holeoftake-up

through

the

machine

2, clockwise spring4,under

needle

thread

arm,

lever6,down

eye

8.

guideatthe

through

around

slack

R

both

and

thread

7723

top of

its

between

and

the

holes,

tension

regulator

through

rod,

then

and

through

discs3,through

5, up

and

thread

retainer7,and

downtothread

all

three

holesinthread

the

from right to left

guide

loop of

from

1 on top

re

thread

through

fronttoback

the

Fig. 13

9.

DrawingUpthe

Bobbin

Thread

Hold the end of needle thread and turn the balance wheel toward you until the needle moves down and up again. Lightly pull the needle thread to draw the bobbin thread up

through the

Always

point

needle

hole (Fig. 14). Lay both

threads

back under the

presser

foot.

turn the balance wheel toward you until the take-up lever is at its highest

before

you

begin

and

after

you

have

completedaseam.

Failure to observe this rule may cause the thread to jam In the hook raceway or to slip

outofthe threads

10.

Regulating

needle

when you

the

eye. If

begin

Thread

the

to sew.

Tension

above

rule is

observed,

there

is no

need

to hold both

The neat appearance of the finished seam and its durability greatly depend on the

correct

The centerofthe

regulation

tensions

of

tensions.

are

correctly

balancedifthe

material,asshown

in Fig. 16.

needle

and

bobbin

threads

interlock in

the

Fig. 14

Pfaff 238, 238-0 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual