Pfaff 441-O, 442-R, 442-O Service Manual

®442-R

441

-O

442-0

Service

Manual

Pfaff, D

6750

Kaiserslautern,

Postfach

3020/3040,

Telex:

045753

Important

note:

ThisServiceManual applies also to the Raff 441-0 and 442-0. Deviations in the illustrations do not

affect

the

adjustment of the machines.

The

Sen/ice

Manual is

based

on a two-needle machine.

When adjusting a single-needle machine,

simply

ignore the adjustment procedure for the left

needle and the left sewing hook. A separate Service

Manual

is available for adjusting the

Pfaff

441-R

(0)-705/03: -755/03.

Tools,

gauges

and

other

items required for adjusting

Raff

machines

442-R, 441-0

and

442-0

1

setofscrewdrivers

with

blades

from2to10mm

wide

1

set

ofwrencheswithopeningsfrom 7 to 14 mm wide

1

set

of alien keysfrom 2 to 6 mm

1 feed dog

gauge,

part No.

91-129995-05

1 adjusting

gauge,

part No. 91

-129573-91

1 C-clamp,

part

No.

880137/00

1

metal

rule

1 wrapper of needles: system 134 (for7 mm fabric clearance)

system

134-35

(for 9 mm fabric clearance)

2 strips of white

paper

Sewing thread and testing material

Technical

data

Maximumsewing

speed:

5000 s.p.m.

Balance

wheel:

65

mm

eff.

dia.

Drive:

clutchmotor0,550 kW(% HP)

lever-operated Stop motor 0,550 kW(% HP)

electronic-stop-motor 0,550 kW(%HP)

Needle system: 134 (for7 mm fabric clearance)

134-35

(for 9 mm fabric

clearance)

Fabric

clearance:7or9mm

Correct

setting:

Scale

ringinreverse-feed

control

With the stitch length

setat"0",

the

"0"

mark on scale ring 3 should be opposite

mark

4.

1.0.1

1.1

Take

the

needles

outofthe

needle

holder.

1.2

Remove

the

knee

levertogether with its coupling

sleeve.

1.3

Tum

knurled

disc1as

farasit willgoin

the

direction in which

the

reverse-feed

control

starts

to

move

downwards.

1.4

Loosen

screw2and

turn

scale

ring

3 until

the

"0"

markIsopposite

mark

4.

1.5

Inthis position, tighten

screw

2.

Correct

setting:

Zeroing

the

bottom

feed

The

feed

dog

must

not

move

forward

when

you turn

the

balance

wheel

with

the

stitch length

setat"0".

2.0.1

2.1

Remove

the

left

upper

plastic plug on

the

backofthe

arm

standard.

2.2

Unscrew

the

gearcase

coveronthe

undersideofthe

machine

base

(collecting

the

oil, if

any,

in a container).

2.3

Loosen

screw1of

the

counter-balance.

2.4

Make

sure

the

stitch length is

setat"0",

then

loosen

both

clamp

screws

2 (Fig. 2.0.1)

just

sufficiently to allow

crank

3 tobeturnedonits

shaft

against

resistance.

2.5

Tofacilitateadjustment, inserta screwdriverinthe slot offeedrockshaftcrank4 (Fig. 2.0.2).

2.0.2

2.0.3

2.6

Turn

the

balance

wheel

and

simultaneously

adjust

rod

5 (Fig. 2.0.3)

connected

to

crank

3 (Fig. 2.0.1) until

the

feed

dog

(or

rather

the

screwdriverinthe

feed

rock

shaft

crank)Iscompletely

motionless.

2.7

Inthis position, tighten both

clamp

screws2securely.

2.8 Leave the screwdriver in the slot of

feed

rock shaftcrank 4 (Fig. 2.0.2) for

the

subsequent

adjustments.

2.9

Check

this

adjustment

(see

"Correct

setting").

Correct

setting:

3.0.2

Bottom

feed

driving

motion

With the machine

set

for its longest stitch and the needle bar positioned at bottom

deadcenter, the feed dog should not move when the reverse-feedcontrol is operated.

J

3.0.1

3.1 Loosen both screws 1 (Fig. 3.0.1) In feed drivingeccentric 2 just sufficientlyto allow the

eccentric to be turned on its shaft against resistance.

3.2

Bring

the

needle

bar

to bottom

dead

center.

3.3 Pushthe C-clampontotheneedlebar,push itupagainsttheneedlebarframeandtighten

its

screw.

3.4

Set

the

machine for its longest stitch.

3.5 Movethe reverse-feed control up and down and simultaneously turn feed driving
eccentric 2 until its notch (see arrow in Fig.3.0.1) is visible and the feed dog (or

rather

the

screwdriverin feed rock

shaft

crank3) is completely motionless.

3.6 Inthis position, securely tighten the accessible screw 1.

3.7

Remove

the

C-clamp

from

the

needle

bar.

3.8

Also tighten

the

second

screw

1.

3.9

Pull

the

screwdriver

outofthe

slotinfeed

rock

shaft

crank

3.

3.10 Check this adjustment (see "Correct setting").

Correct

setting:

Lower

needle

bar

driving

crank

With the stitch length

set

at "0", the flat surface of lower needle bar driving crank 4

shouldbeso

positioned that its

edge

is parallel to

the

edgeofthe

bedplate.

4.0.1

4.0.2

4.1

Take

out

screws

1 of clip bracket 2

and

remove

the

bracket.

4.2

Set

the

machine for its longeststitch.

4.3

Loosen

screws

3.

4.4

Set

the

stitch length at

"0".

4.5 Turn lower

needle

bar

driving

crank4so

that

the

edge

of its flat

surface

is parallel

to

the

edgeofbedplate.

4.6 Inthis position,tightenthe accessible screw 3.

4.7 Againset the machineforitslongeststitchand tightenthe second screw3, too.

4.8 Replace bracket 2

and

tighten

screws

1.

Correct

setting:

5.1

5.2

5.3

5.4

Counter-balance

With

the machine set for its longest stitch, counter-balance 2 should move freely

when

the reverse-feed control is operated.

5.0.1

Set

the

machine for its longest stitch.

Makesure screw 1 ofcounter-balance 2 is loose (Fig.5.0.1), move the latteras faras it

will

go, turning it inthe direction indicated by an arrow.

Turnthe counter-balancebackbyabt.1 mmagain,and inthis

position

tighten

screw1.

Check this adjustment

(see

"Correct setting").

Correct

setting:

6.1

6.2

6.3

6.4

6.5

6.6

6.7

6.8

6.9

Bottom

feed

lifting

motion

When the needle bar is at bottom

dead

center, the feed dog should be at its

highest

point.

n

W

Set

the

stitch length at

"0".

Loosen

clamp

screw

1.

Turn out

screw

3 incollar 2 by half a turn.

Insert a screwdriver in

the

slot of bottom

feed

lifting

crank4and

bring

the

needle

bar

to

bottom

dead

center.

Push

the C-clamponto

the

needle

bar, push itup

against

the

needle

bar

frame

and

tighten

its

screw.

Turn

coiiar2on

the

collarofthe

lifting

eccentric

until

the

feed

dog

(or

screwdriver)

isatbottom

dead

center.

Inthis position, tighten clamp

screw

1.

Remove the C-clamp from

the

needle

bar

and

tighten

screw

3.

Pull

the

screwdriver

outofthe

slot

of bottom

feed

lifting

crank4and

check

this

adjustment

(see

"Correct

setting").

Correct

setting:

7.1

7.2

7.3

7.4

7.5

7.6

7.7

Note:

Clearance

between

presser

foot

and

needle

plate

Withpresser bar lifter1 raised, there shouid be a ciearance of7.0 mm (needie system

134) or 9.0 mm (needle system 134-35) between presserfootand needle plate.

7mm(9mm)

f

Take

out

the

two

screwsofthe

face

cover

and

remove

the

latter.

Unscrew

the

cover

on

the

backofthe

machine

arm.

Raise

presser

bar lifter1 and screw on the

presser

foot.

Loosen both

screws

2 in the

presser

bar collar.

Push the 7-mm (or9-mm) thickpart ofthe gauge under the presserfootso that itsrecess

faces downwards (Fig. 7.0.1).

Push the presser foot downonto the gauge and adjustItlaterallysothat its

sides

are

parallel to

the

edgesofthe

needle

plate

slot.

Inthis position, tighten both screws 2.

Adjust

the presser footpressure by

turning

regulating

screw4

(Fig.

9.0.1)inoroutwhen

you

make

a sewing test.

Correct

setting:

Feed

dog

height

Withthe stitch length

setat"0"

and

the

needle

bar

positioned at bottom

dead

center,

the feed dog should be centered in its slots and contact the gauge throughout its

entire length (Fig. 8.0.2).

2

8.1

Set

the

stitch length at

"0".

8.2

Bring

the

needle

bar

to bottom

dead

center.

8.3 Loosenclamp

screws

1 offeed liftingcrank2

and

clamp

screws

3 offeed rock shaftcrank4.

8.4

Place

the

machine feed

gaugesounder

the

presser

foot that its

recess

faces

downwards

and

its front

edge

is flush with

the

front

edgeofthe

needle

plate.

8.5

Lower

the

presser

bar

lifterto

rest

the

presser

foot on

the

gauge.

8.6

Center

the

feed

doginits

slots.

8.7

Push

the

feed

bar

upwardsuntil

the

feed dog

contacts

the

gauge,

and

hold itinthis position.