Pfaff 481 Manuale utente

481

Service

Manual

PFAFF

INDUSTRIEMASCHINEN

GMBH

KAiSERSLAUTERN

From the library of: Superior Sewing Machine & Supply LLC

Instructions

for Adjusting

the

Pfaff 481

and

Illustrated Guide for

Tape-Recorded

Instructions

Important

note

Never

use a

C-clamp

on the needle bar of

Pfaff

480 series

machines

because this

would

damage

Its

special

coating.

Furthermore,

all adjustments

which

are to be made at a

stitch

length

of "0" on

Model

Nmachines have to be carried out at a stitch length of 1.5

and

with the reverse-feed control depressed, that means with the machine

set

for sewing back

wards

stitch

length

1.5

mm.

The machine can be blocked at certain positions by Inserting a 5-mm-thlck pin In one of

the holes In the bearing plate

which

Is located underneath the face cover.

When

Inserting

the

pin,

be sure to push It

until

Itenters the slot

the disc

behind

the bearing plate. For

easy Identification, the Individual holes are marked by the numbers 1 to 5 or by the appro

priate adjustment data. The abbreviations used In this connection stand for the

following:

n. o. T. =

past

the

top

the

needle

bar

stroke

n. u. T. =

past

the

bottom of

the

needle

bar

stroke

o. T. N. =

top

needle

bar

stroke

o. T. F. =

top

take-up

lever

stroke

Schl.-H. = 1.8 mm

past the

bottom of

the

needle

bar

stroke

The following tools, gauges and accessories are required for adjusting the Pfaff 481;

set

screwdrivers

with

blades

from

2 —

wide

set

alien

keys

ranging

from

1.5

to 6 mm

set

spanners

from

7 to 14 mm

wide

22-mm

spanner

metal

rule

1cylindrical pin, 5 mm dia..

Order

No. 13-030341-05

universal

gauge.

Order

Nr.

61-111642-19

wrapper

with

System

134

needles

strip

white

paper,

sewing

thread

and

material

for

testing

purposes.

From the library of: Superior Sewing Machine & Supply LLC

Preparations

for

adjusting

Note:

The machine can be blocked at different positions by inserting the 5-mm-

thick pin in the appropriate hoie of the bearing plate. For easy identifica

tion,

the

holes in

the

bearing plate

are

marked by numbers or

the

appro

priate

adjustment

data

(Fig. 1.0.1.).

Fig.

1.0.1.

1.1.

Remove

the

belt

guard.

1.2.

Take

out

both

screws

the

face

cover

and

remove

it.

1.3.

block

the

machine

the

various

positions,

proceed

follows:

1.3.1.

Turn

the

balance

wheel

bring

the

needle

bar

the

desired

position.

1.3.2.

Push

the

pin into

the

hole

until it

enters

the

slot

the

disc

behind

bearing

plate.

1.4.

The

function

each

the

five

holes

follows:

1.4.1. Hole 1 (0.6 n. o. T.) = 0.6 mm

past

the

top

the

needle

bar

stroke.

1.4.2.

Hole

2 (o. T. F.) =

top

take-up

lever

stroke.

1.4.3.

Hole

3 (0.6 n. u. T.) = 0.6 mm

past

the

bottom

the

needle

bar

stroke.

1.4.4.

Hole

4(Schl.-H. 1.8) = 1.8 mm

past

the

bottom

the

needle

bar

stroke.

1.4.5.

Hole

5 (o. T. N.) =

top

needle

bar

stroke.

the

From the library of: Superior Sewing Machine & Supply LLC

Correct

setting:

2.1.

2.2.

2.3.

2.4.

2.4.1.

2.4.2.

2.4.3.

2.4.4.

2.4.5.

2.4.6.

2.4.7.

2.4.8.

Zeroing

the

feed

motion

The

feed

dog

must

not move

when

you turn

the

balance

wheel with

the

stitch

length

control

set

"0".

Fig. 2.0.1.

Remove

the

needle

from

the

needle

bar.

Raise

the

presser

bar

iifter.

Remove

the

knee

lever

together

with

its

joint

and

tilt

the

machine

back.

Adjustment

procedure

applied

when

the

gearcase

open

(Fig. 2.0.1.)

Turn

the

stitch

iength

control

"0".

Take

out

the

screws

the

gearcase

cover

and

remove

the

cover

with

its

gasket,

making

sure

that

the

oil, if

any,

drained

off

into

container.

Take

the

oil

sponge

out

the

gearcase.

Loosen

both

clamp

screws

2 of

feed

crank

just

sufficiently

allow

the

crank

turned

its

shaft

against

resistance.

faciiitate

adjustment,

insert

screwdriver

the

slot

feed

rock

shaft

crank

(see

Fig. 2.0.1.).

Rotate

the

balance

wheel

and

the

same

time

adjust

feed

crank

Its

shaft

until

the

feed

dog

(or

rather

the

screwdriver

in feed rock

shaft

crank

longer

moves.

Tighten

both

clamp

screws

2 of

feed

crank

Check

this

adjustment

(see

top

page).

From the library of: Superior Sewing Machine & Supply LLC

Note:

The feed motion

can

also be zeroed with the

gearcase

ciosed (see Fig.

2.O.2.).

^ r

Fig.

2.0.2.

2.5.

Adjustment

procedure

applied

when

the

gearcase

cover

closed

(Fig.

2.O.2.).

2.5.1.

Turn

the

stitch

iength

control

"0".

2.5.2.

Push

22-mm

open-ended

spanner

over

hexagon

tension

nut

and

hold

feed

regulator

shaft

fast

with

it.

2.5.3.

Loosen

clamp

screw

4 of

feed

regulator

crank

2.5.4. With

the

aid

the

spanner

pushed

over

hexagon

tension

nut

turn

feed

regulator

shaft

2 until

the

feed

dog

(or

rather

the

screwdriver

feed

rock

shaft

crank

remains

absolutely

still

when

the

balance

wheel

turned.

2.5.5. Hold

the

spanner

this

position

and

tighten

clamp

screw

making

sure

there

is a

clearance

of 5 mm

between

feed

regulator

crank

and

the

casting.

2.5.6.

Check

this

adjustment

(see

top

page

and

pull

the

screwdriver

out

the

slot

the

feed

rock

shaft

crank.

From the library of: Superior Sewing Machine & Supply LLC

Correct

setting:

Feed

lifting

motion

The feed dog should be at Its highest point when

the

needle bar Is at a

position 0.6 mm past the bottom of its stroke (pin in hole 3). In this position,

the

notch

the

feed

lift

eccentric

should

positioned

perpendicularly

below

the

center

the

shaft

(Fig. 3.O.2.).

Fig.

3.0.2.

I."

Fig.

3.0.1.

3.1.

Loosen

both

screws

feed

lift

eccentric

3.2.

Bring

the

needle

bar

position

0.6 mm

past

the

bottom

of its

stroke

and

block

the

machine

this

position

Inserting

the

pin In

hole

3.3.

Turn

feed

lift

eccentric

1 until its

notch

points

exactly

downwards

(see

dash-

dot

line

In Fig. 3.O.2.), I. e.

the

feed

dog

its

highest

point.

3.4. In

this

position,

securely

tighten

both

screws

3.5.

Leave

the

pin In

the

hole

the

bearing

plate.

3.6.

Check

this

adjustment

(see

top

page).

From the library of: Superior Sewing Machine & Supply LLC

Correct

setting:

Feed

dog

height

The

feed

dog

should

positioned

the

middle

of its

slots

and

contact

the

gauge

throughout

its

entire

length

when

the

stitch

length

control

set

"0"

and

the

needle

bar

position

0.6 mm

past

the

bottom

of its

stroke

(pin in

hole

3). (Fig. 4.0.2.)

Fig.

4.0.2.

4.1. Turn the stitch length control to "0" and check to make

sure

the

pin is

inserted

hole

4.2.

Loosen

clamp

screw

2 of

feed

lift

crank

4.3.

Loosen

both

ciamp

screws

4 in

feed

rock

shaft

crank

4.4.

Place

the

universal

gauge

under

the

presser

foot so

that

the

arrow

points

the

direction of

feed

and

its front

edge

is flush with

the

front

edge

the

needle

plate.

4.5.

Lower

the

presser

bar

lifter to

rest

the

presser

foot

the

gauge.

4.6.

Position

the

feed

dog

the

middle

its

slots

(Fig. 4.O.2.).

4.7.

Push

the

feed

bar

upwards

until

the

feed

dog

contacts

the

gauge

and

hold

the

feed

dog

this

position.

4.8. Turn

eccentric

bushing

underneath

feed

rock

shaft

crank

3 until

the

feed

dog

is in

contact

with

the

gauge

throughout

its

entire

length (Fig. 4.O.2.).

4.9. Tighten both

clamp

screws

4 of feed rock

shaft

crank

3, making

sure

that

the

feed

dog

is still

centered

its

slots.

4.10.

Check

make

sure

that

the

feed

dog

is still in

contact

with

the

gauge

throughout

its

entire

length

and

firmly

tighten

clamp

screw

2 of

feed

lift

crank

4.11.

Raise

the

presser

bar

lifter,

remove

the

gauge

from

under

the

presser

foot,

and

pull

the

out

the

hole

the

bearing

plate.

4.12.

Check

this

adjustment

(see

top

page).

From the library of: Superior Sewing Machine & Supply LLC

Correct

setting:

6.1.

5.2.

5.3.

5.4.

5.5.

5.6.

5.7.

5.8.

5.9.

Feed

driving

motion

The

feed

dog

should

not move

when

the

reverse-feed

control

Is moved up

and

down

with

the

machine

set

for

Its

longest

stitch

and

the

needle

bar

set

0.6 mm

past

the

bottom

of Its

stroke

(pin In

hole

3).

Loosen

both

screws

2 of

feed

driving

eccentric

Bring

the

needle

bar

to a

position

0.6 mm

past

the

bottom

of Its

stroke

and

block

the

machine

this

position

inserting

the

pin In

hole

Set

the

machine

for

Its

longest

stitch.

To facilitate

adjustment,

push

the

screwdriver

Into

the

slot

feed

rock

shaft

crank

3 (Fig. 5.0.1.).

Move

the

reverse-feed

control

and

down

and

simultaneously

turn

the

feed

driving

eccentric

until its

notch

is visible

and

the

feed

dog

(or

rather

the

screw

driver

feed

rock

shaft

crank

3) is

completely

motionless

(Fig. 5.0.1.).

this

position,

tighten

the

accessible

screw

2 In

feed

driving

eccentric

Pull

the

out

the

hole

the

bearing

plate

and

tighten

the

second

screw

2 In

feed

driving

eccentric

Check

this

adjustment

(see

top

page).

Pull

the

screwdriver

out

the

slot

the

feed

rock

shaft

crank.

From the library of: Superior Sewing Machine & Supply LLC

Correct

setting:

Zeroing

the

needle

feed

motion

The

needle

bar

should

make

no feed motion when

the

balance

wheel is

turned

with

the

stitch

length

control

set

"0".

Fig.

6.0.1.

Fig.

6.0.2.

6.1. Turn

the

stitch

length

control

"0".

6.2. To facilitate

zeroing

the

needle

feed

motion,

insert

screwdriver

the

slot

needle

feed driving

crank

3 (Fig. 6.O.2.).

6.3.

Take

out

the

two

screws

the

cover

the

back

the

machine.

6.4. Loosen clamp screw 1 of needle feed regulating crank 2 (Fig.

6.0.1.).

6.5. Adjust

needle

feed

regulating

crank

that

the

needle

bar

makes

feed

motion

when

the

balance

wheel

turned

(I.e.

that

the

screwdriver

needle

feed

driving

crank

remains

still).

6.6. In this position, securely tighten clamp screw 1 of needle feed regulating

crank

6.7. Check this adjustment (see top of page).

6.8. Leave the screwdriver in the slot of driving crank 3.

From the library of: Superior Sewing Machine & Supply LLC

Correct

setting:

Timing

the

needle

feed motion

Both the needle bar and

the

feed dog should remain motionless when the

reverse-feed control Is moved up and down with the machine

set

for Its

longest stitch and the needle bar set 0.6 mm past the bottom of Its stroke

(pin In

hole

3).

Fig. 7.0.1.

7.1.

Loosen

both

screws

1 in

needle

feed

eccentric

7.2. Bring

the

needle

bar

to a

position

0.6 mm

past

the

bottom

of Its

stroke

and

block

the

machine

this

position

Inserting

the

pin In

hole

3 of

the

bearing

plate.

7.3.

Turn

needle

feed

eccentric

that

Its

slot

points

forward

(see

arrow

In Fig.

7.0.1.).

7.4.

Set

the

machine

for its

longest

stitch.

7.5.

Move

reverse-feed

control

and

down

and

simultaneously

turn

needle

feed

eccentric

2until

the

needle

bar

remains

still (I. e. until

the

screwdriver

needle

feed

driving

crank

3 Is

completely

motionless).

7.6. In

this

position,

tighten

the

accessible

screw

1 In

needle

feed

eccentric

7.7. Pull the pin out of

the

hole In the bearing plate and tighten

the

second

screw

needle

feed

eccentric

7.8.

Check

this

adjustment

(see

top

page).

7.9. Remove

the

screwdriver

from driving

crank

From the library of: Superior Sewing Machine & Supply LLC

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