Pfaff 418 Series Manuel utilisateur

418

438

838

PFAFF

Service

Manual,

innovation

made

PFAFF

Contents

Page

1Preparations for adjusting 2

2Centring the needle in

the

needle hole (in sewing direction) 5

3Setting

the

stabilizing rod parallel to the

needle

bar

Stitch

width

control

4.1

Zeroing

the

needle

for straight stitching 8

4.2

Stitch

width

scale

4.3

Limiting

the

maximum stitch width

4.4

Adjustung

the

locking

lever

5Adjusting

the

needle

the

needle

hole (sideways)

6Adjusting

the

needle

throw

7Needle position "left, centre, right"

8Adjusting

the

needle

position lever

9Adjusting

the

stitch length

scale

ring

Zeroing

the

bottom

feed

10.1

Adjustment with

closed

gearcase

10.2

Adjustment

with

open

gearcase

Adjusting

the

bottom

feed

driving motion

Bottom

feed

liftingmotion

21+22

Tensloning

the

driving belt in

the

gearcase

Adjusting

the

hook bearing bracket

Preliminary adjustment of

needle

bar height

Oil distributor ring

Hook timing

and

hook-to-needle

clearance

Final

adjustment

needle

bar

height

Bobbin

case

opener

19.1

Position of bobbin

case

opener

29+30

19.2

Timing

the

bobbin

case

opener

Adjusting

the

slack

thread

control

Clearance

between

presser

foot

and

needle

Feed

dog

height

34+35

Oil

check

valve

Tension

release

mechanism

37+38

Lubrication of

zigzag

eccentric

Hook

lubrication

Knee

lever

stroke

limitation

Knee lever play

Bobbin

winder

Thread

check

spring

and

thread

regulator

Presser

foot

pressure

Annex

for

machines

equipped

with

zigzag

control

-716/..

Needle

vibration

33 Left,

center

and

right

needle

positions

46+47

Needle

position

lever

48+49

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Notes

safe

machine

operation:

The machine must only be usedforthe purpose It

has

been designed for.

When

converting Itto anotherversion, all valid safety rules

must

followed.

Service and repair workmust only be performed by qualifiedpersaonel.

Workon liveparts Is not permitted, apart fromexceptions according to

DIN

57105

and VDE0105.

Service manual

418,438,838

appliesto the following versions:

418 438

838

418-716/.. 438-716/..

838-716/..

For

the

adjustment of automatic fancy-stltch

mechanism

-718/01

and

thread trimmer -900/..

there

are

separate

manuals.

Important

note

Donot use a C-clamp on the needlebar of Pfaff

418,438

and

838 machines

thiswoulddamage

Its special coating. Make

sure

you

check

the

hook lubrication

system

(see

Section 27) on ma

chinesInoperationforthe firsttime or which

have

been

Idlefor a longer period (I.e.1 or 2 months).

For shipping

purposes

the

oilis drained from

the

needle

vibrating eccentrichousing of the

Raff

418,438

and

838. ItIstherefore

necessary

fill

this housing with 75 c.c. of oil

(see

Section26) before operating

the

machine

for

the

first

time.

sticker

the

machine

arm

serves

reminder.

When the machine Isgiven a general overhaul put about2c.c. of piniongrease, witha dripping point of

160°C, in the bevel-gear

case

of the hook. We recommend you use Molykote-Longtherm 00. This

grease

can

obtained

from us

under

No. 280-1-120 199.

Tools,

gauges

and

other

accessories

required

for

adjusting

the

machines

set

screwdrivers

with

wide

blades

set

of alien

keys

from 1.5 to 6 mm

set

wrenches

with

openings

from 7 to 14 mm wide

1wrench with 27-mm-wlde

opening

metal

ruler

1 cylindrical pin (5 mm dia.), No. 13-030 341-05

feed

dog

gauge,

No. 91-129

995-05

1 hook bearing bracket

gauge.

No. 91-129

996-05

wrapper

system

438

needles

strips

of white

paper

1 rollof

adhesive

tape

Sewing

thread

and

testing

material

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Note:

Preparations

for

adjusting

To allow the machine to be blocked with

the

needle

bar

the

required position

the

bearing plate (Fig.1.0.1.)

has

four holes.

Afterpositioning themeedlebaras requiredpushthe pinintothe appropriatehole

until

enters

the

recess

behind the bearing plate, thus blocking the machine.

5mrn

1.0.1

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

1-1

Take

out

screws

1 from

the

cast

iron

cover

and

remove

the

cover. (Do not

remove

the

needle bar lubricating wickfromits hole inthe cover sealing plate.)

.2 Drainthe oilfromthe needle vibratingeccentric housing.

1.0.2

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

1.3

Unscrew

the

two

screws

the

face

cover

and

remove

the

cover.

Take

out

screw

and

remove the

presser

foot.

Take

out

screw

and

remove

the

thread guide.

Loosen

screv^jof

thejthread

control

and

remove

the

latter

pulling

downwards.

.7 Unscrew alien screws 5 (do not remove cover plate 6 itis stillconnectedto oilwick9).

.8 Loosen clamp screw7 and pullstabilizing rod 8 down a

little.

Remove

plate 6 with oilwick 9.

.10 Insert a new needle (system 438) and push itup as far as it

will

go; the longgroove should

face

the

front.

1.0.4.

1.0.3.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Centring

the

needle

the

needle

hole

(in

sewing

direction)

When

the

stitch width is

set

at "0"

and

the

needle

position lever is in its central position

the

needle

must

enter

the

needle

hole

exactly

the

middle (in

sewing

direction).

4 L(

5Ti

6In

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Setting

the

stabilizing

rod

parallel

the

needle

bar

Setting: Stabilizing rod 4

must

be parallel to

the

needle

bar.

Adjustment:

3.1

The

lobe of eccentric

stud

must

always point downwards.

Bring

the

needle

bar

t.d.c.

and

Insert

the

pin In

hole

"2"

the

bearing

plate

(to block

the

machine).

lulaking

sure

that

lock

screw

7 Is

loose,

loosen

screw

(accessible

from

the

back

the

machine

arm).

Loosen

jam nut 2 und turn eccentric

stud

that Its lobe points downwafds.

Insert

stabilizing rod 4 in

the

loop of oil wick 5.

Position stabilizing rod 4

that

the

recess

at Its top

end

(see

arrow in Fig. 3.0.1)

touches

eccentric

stud

Hold

stabilizing

rod

4firmly

and

turn

eccentric

stud

3until

stabilizing

rod

4 Is

parallel

the

needle

bar

(Fig.

3.0.2).

this

position

tighten

eccentric

stud

3 with nut 2.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

3.8 Tocheck that itis paraileltothe needle barfirstpullstabilizing rod4 downand then push

it up again

far

will

go, making

sure

that guide 6

does

not move to the

side

(if

necessary

turn eccentric

stud

3accordingly).

•9

Making sure that stabilizing rod 4 is still in contact with eccentric stud 3 tighten clamp

screw

7securely.

.10 Remove the cylindricalpinfromthe hole inthe bearing plate.

.11 Bring

the

needle

bar

to b.d.c.

and

tighten

screw

1 which is

accessible

from

the

back

the

machine

arm.

.12

Screw

on cover plate 8.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

4.1

Setting:

Stitch

width

control

Zeroing

the

needle

for

straight

stitching

When

the

stitch

width

control

set

"0"

the

needle

bar

must

not

move

the

side.

4.0.1

Adjustment:

4.1.1

Set

needle position lever 1 at its central position.

Loosen

screws

and

.3 Loosen clamp screw 4 and let lockinglever 5 move back

until

itsspring is relaxed.

.4 Inthis position, tighten

clamp

screw

.5 Move stitch width lever 6 to the right

far

will

go (i.e. towards "0").

.6 Turn on the master switch and let the machine run slowly.Move

stitch

width lever 6 to

the

left until

the

needle

bar

stops

swinging

sideways.

.7 Inthis position push screw2 to the right

far

will

go and tighten it.

.8 Check this adjustment (see "Setting").

Switch

off

master

switch.

Screw

still

loose.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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