Pfaff 3334 Manuel utilisateur

IS'

' " (D

(TOFF)

3334

Automatic

Lockstitch

Bortocker

SERVICE

MANUAL

From the library of: Superior Sewing Machine & Supply LLC

Foreword

Pfaff sewing machines

are

quality products. Constant checks ore

being made throughout the production process to ensure that o

high quality standard is maintained.

But

even the best sewing

machine

has to be operated and serviced

skillfuify

if satisfactory

results

are

obtained.

This book has been compiled cs a source of information for all

Pfaff mechanics servicing Pfaff 3334 automatic bartackers and

will serve as a valuable guide in performing minor repairs and

adjustments.

We have made every effort to render the presentation of these

instructions as simple as possible and have included numerous

illustrations inorder to afford a betterunderstanding.

PFAFF

Kaiserslautern

Branch

From the library of: Superior Sewing Machine & Supply LLC

SERVICE

MANUAL

PFAFF

3334

Automatic

Lockstitch

Bortocker

From the library of: Superior Sewing Machine & Supply LLC

Contents

Page

Description

and

Operation

General

Information

a. Purpose of Employment 6

Application

Possibilities 7

Operation

a. Efficiency Rating 8

Mode

Operation

c. Sewing Cycle 9

3. Mechanical Setup . 13

Shuttle

ond

Needle

Bar

Drive

Feed

Motion

Automatic

Stop

Motion

Thread

Trimming Action 20

B. Instructions for

Repair

1. Disassembly , 30

2. Assembly 31

3. Adjustment

and

Check-Up 33

a. Timing the Shuttle

and

Setting the Needle Bar ot Correct Height 33

b. Timing the Feed Motion 39

c. Timing the Thread Trimming Action 46

d. Adjusting the

Work

Clamp 49

e. Timing the Stop Motion 49

f. Timing the Thread

Nipper

and

Adjusting the Thread Tension 53

From the library of: Superior Sewing Machine & Supply LLC

4. Stitching-Off 60

a. Sewing

Thread

Needle

c. Bobbin Winding 61

Needle

Threading 62

e. Threading the Bobbin

Case

f. Inserting the Bobbin

Case

Setting-Up

Individual

Power

Drive

Bench

Power

Drive

c. Individually Powered Machine on Power Benching

....

Subclass

Conversion

a. Changing the Feed Cam 69

b. Changing the Knife Cam 70

c. Changing the Work Clamp Feet 71

d. Changing the Feed Plate 71

7. Trouble Shooting 71

a. Skipped Stitches 71

b. Thread Breaking

c. Needle Breaking 71

d. Heavy Working 72

e. Irregular Stopping 72

Machine

Care

a. Cleaning and Oiling 75

b. Dismantling the Shuttle Race 77

From the library of: Superior Sewing Machine & Supply LLC

C. Electromagnetic Control 78

General

Information

Brief Description 78

b. Key to Symbols Used 79

Operating

Instructions for X35

and

X45 Devices 80

a. Turning on Master Switch HS 80

b. Inserting the

Work

and

Operating

Foot Switch FS (1st Switch Position) 80

c. Starting the Machine by Operating

Foot Switch FS (2nd Switch Position) 80

d. Sewing Cycle

and

Automatic Stopping of Machine

....

3. Working of Device 84

Master

Switch

Foot

Switch

FS 84

Solenoid

and

Switch

4. Mounting

and

Adjustment Procedures 87

Switch

Lever

Solenoid

Switch

Solenoid

Subclass

Information

1. Subclasses Having the

Same

Gear

Ratio 92

Subclasses

Having

the

Same

Knife

Cam

3. Subclosses Requiring Additional Parts 94

4. Principal Parts Varying from

One

Subclass to

Another

....

5. Special

Organizational

Parts 96

lock

Designs

Arranged

by Shapes 99

From the library of: Superior Sewing Machine & Supply LLC

A. Description

and

Operation

Stitch Type:

LoopTaker System;

Bobbin Capacity:

Needle System:

Foot

Lift:

Maximum

Length of Tack:

Maximum

Width

Tack:

Classes

Work:

General

Information

Lock

stitch

Oscillating (central bobbin) shuttle

66 yds No. 40/3 cotton

Model A and B machines use System 34 R needles for

ordinary sewing operations, and System 34

or 34 D

needles for leather work (needle size up to

110).

Model C

machines

use

System

332

needles

for ordinary

sewing

operations, and System 332

or 332 D needles for

leather

work.

(Additional needle

systems

thot may be used are listed

page

60).

'V32"

to Vb", or 15 to 16 mm (on

earlier

machines the

foot lift ranges from "/as" to

'V32",

or 9 to 10

mm).

1Vib",

36 mm

Va",

22 mm

ModelsA and Bare used for

light-

to medium-weight

materials.

Model C is used for heavyweight materials (machine

features higher needle bar rise and larger take-up

motion).

From the library of: Superior Sewing Machine & Supply LLC

a. Purpose of Employment

The

Pfaff

3334

specially

designed

for

automatic

bartacking

and short

seaming

operations

every

description.

While

both

the

shape

of the

tack

and the number of stitches per tock ore predetermined for each subcloss, the

size

most

tacks

can

varied

within

certain

limits.

The machine'sfield of application embraces oil branches of the sewing indus

try.

Thus,

opart

from

bartacking, it may be

employed

for

stitching

staying

seams,

attaching

belts

and straps, and

stitching

arnamentol

tacks,

to name

justa few additional applications. (See ill.on page 7).

The Pfaff

3334

is of the cylinder-bed construction.

Its

slender cylinder arm

greatly facilitates the

handling

of the

work,

particularly

when

tubular arti

cles

are

being stitched.

If desired, the Pfaff 3334 automatic bartacker can be fitted with electro

magnetic

control,

this

version

being

known

Pfaff

3334

Models

Aand

or Pfaff 3334X45 in Model C. On this machine, the functions of raising the

work clomp and storting the

machine

are performed by solenoids, and the two

treadles of the standard model ore replaced by a foot switch (Fig.4).

Feed

Motion

The work is held between, and guided by, the work clamp and the feed

plate. To produce the desired

tack,

the material is

moved

up and across the

machine bed while the needle moves up and down. The feed motion is deriv

from

the

feed

com.

The Pfaff 3334 attains a speed of up to

1,200

s.p.m., depending on the

thickness of the material as well os the size

and

shape

of the tack. To convert

the machine from one subclass to another, it

will

be sufficient normally to

exchange the feed plate and the clamp feet rather than the complete work

clamp.

If,

however, the shape and size of the tack or the number of stitches in the

design

ore to be changed, the feed cam,

knife

cam,

worm

and

worm

wheel

have

to be exchanged.

From the library of: Superior Sewing Machine & Supply LLC

b. Application Possibilities

Fig. 1

From the library of: Superior Sewing Machine & Supply LLC

Operation

a. Efficiency Rating

The output of on automatic bartacker is determined by the following factors:

(1)

the number of stitches

per

tack,

(2)

the

handling

times

involved

in a

given

operation

(which,

turn,

are de

termined by the size and bulkineess of the workpiece),

(3)

the quality of material

and

thread,

(4}

the handy arrangement of the work, and

(5)

the

speed

of the machine.

The

Pfaff

3334

automatic

bartacker

can

fitted

moke

7, 9, 14, 16, 18,

21, 24, 28,

32, 36,

42,

48,

56,

and 72

stitches

per

tack.

The

tack

design

diagrams

contained in the Subclass Catalogue (Form No.

10080)

illustrate the versati

lity

of this efficient

machine.

special

coses,

it may be advisable to sub

mita sample of the moterial to be sewn as well as a specimen of the finished

work

either

the

Kaiserslautern

Branch

G.M.

Pfaff

the

nearest

Pfaff industrial

sewing

machine

representative.

b. Mode of

Operation

While both the length and width of a bartack con be varied within certain

limits

simply

adjusting a lever, its shape as well as the number of

stitch

es it comprises can be varied only by exchanging the feed cam.

many

instances, the worm gear assembly and the knife cam must be exchanged

addition.

The entire sewing action, including the stopping of the

machine,

is controlled

automatically.

The machine is equipped with two cams which ore corried on a joint trans

verse

shaft

either

side

the

machine

arm.

The right, or feed, cam has two pattern-forming grooves, one on each side.

While the groove on its outside face controls the crosswise feed

motion,

the lengthwise feed motion emanates from the groove on its inside face.

The feed cam, in addition, carries

one

or several stop tripping segments as

well as one or several thread nipper tripping segments. Whereas the former

serve to stop the machine at the completion of a sewing cycle, the latter

actuate

the

thread

nipper.

The number of stop tripping segments and thread nipper tripping segments

provided on the rim of the feed cam depends on the number of tacks pro

duced

per

cam revolution.

From the library of: Superior Sewing Machine & Supply LLC

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