Pfaff 571 User manual

571
574
296-12-19 304/002
Instruction Manual engl. 08.15
This instruction manual applies to machines from
the following serial numbers onwards: 7 260 186
and software version 0435/002.
INSTRUCTION MANUAL
591

Reprinting, reproduction and/or translation of PFAFF instruction manuals (including parts
thereof) is only permitted with our prior agreement and citation of the source.
PFAFF Industriesysteme
und Maschinen GmbH
Hans-Geiger-Str. 12 - IG Nord - Germany
D-67661 Kaiserslautern
This instruction manual applies for all of the designs and subclasses listed in
Chapter 3 Technical Data.
The settings manual for the machine can be downloaded at no charge under
www.pfaff-industrial.de/de/service-support/downloads/technical. As an al-
ternative to the Internet download, the settings manual can also be ordered as
a hard copy under order no. 296-12-19 305/002.

Table of Contents
Contents ..................................................................................Page
1Safety .................................................................................................................................... 5
1.01 Directives............................................................................................................................... 5
1.02 General safety instructions .................................................................................................... 5
1.03 Safety symbols ...................................................................................................................... 6
1.04 Special points of attention for the owner-operator ................................................................ 6
1.05 Operating personnel and technical staff ................................................................................ 7
1.05.01 Operating personnel .............................................................................................................. 7
1.05.02 Technical staff........................................................................................................................ 7
1.06 Danger warnings.................................................................................................................... 8
2Proper Use............................................................................................................................ 9
3Technical Data ▲................................................................................................................ 10
3.01 PFAFF 571 ........................................................................................................................... 10
3.02 PFAFF 574 ........................................................................................................................... 11
3.03 PFAFF 591 ........................................................................................................................... 12
4Disposal of the Machine.................................................................................................... 13
5Transport, Packaging and Storage ................................................................................... 14
5.01 Transport to the customer's premises ................................................................................ 14
5.02 Transport within the customer's premises.......................................................................... 14
5.03 Disposal of the packaging materials .................................................................................... 14
5.04 Storage ................................................................................................................................ 14
6Work Symbols.................................................................................................................... 15
7Operating Controls ............................................................................................................ 16
7.01 Main switch ......................................................................................................................... 16
7.02 Buttons on the machine head (only in machines with backtacking system -911/..) ............ 16
7.03 Bobbin thread monitoring using stitch counting .................................................................. 17
7.04 Pedal .................................................................................................................................... 17
7.05 Hand lever to raise the roller presser................................................................................... 18
7.06 Swivelling out the roller presser .......................................................................................... 18
7.07 Button for stitch length regulation ....................................................................................... 19
7.08 Knee lever............................................................................................................................ 19
7.09 Edge trimmer -725/04 for PFAFF 571 .................................................................................. 20
7.10 Edge trimmer -725/04 for PFAFF 574 and 591 .................................................................... 21
7.08 Control panel (only in machines with P40 CD)..................................................................... 22
8Set-up and Initial Commissioning .................................................................................... 23
8.01 Set-up .................................................................................................................................. 23
8.01.01 Setting the table height ....................................................................................................... 23
8.01.02 Inserting the sewing machine into the stand ...................................................................... 24
8.01.03 Assembling the anti-tipping device...................................................................................... 25

Table of Contents
Contents ..................................................................................Page
8.02 Mounting the flange motor.................................................................................................. 25
8.02.01 Mounting the flange motor on the bearing plate ................................................................. 25
8.02.02 Mounting the flange motor on the machine ........................................................................ 26
8.02.04 Mounting the flange motor belt guard................................................................................. 27
8.02.05 Mounting the machine cover............................................................................................... 27
8.02.06 Connecting the safety switch .............................................................................................. 28
8.03 Connecting the plug-in connections and ground cable ........................................................ 29
8.04 Assembling the reel stand ................................................................................................... 30
8.05 Initial start-up ....................................................................................................................... 31
8.06 Switching the machine on / off............................................................................................ 31
8.07 Machine drive home position .............................................................................................. 31
8.08 Checking the start inhibitor function.................................................................................... 31
9Set-up.................................................................................................................................. 32
9.01 Inserting the needle ............................................................................................................ 32
9.02 Winding the bobbin thread, adjusting the thread tension.................................................... 33
9.03 Removing / inserting the bobbin case ................................................................................. 34
9.04 Inserting the bobbin case / adjusting the bobbin thread tension ......................................... 34
9.05 Threading the needle thread / adjusting the needle thread tension
(with the PFAFF 571 and 591) ................................................................................................ 35
9.06 Threading the needle thread / adjusting the needle thread tension
(with the PFAFF 574) ......................................................................................................... 36
9.07 Adjusting the stitch length................................................................................................... 37
9.08 Setting the stitch counting function for the bobbin thread control ..................................... 37
10 Maintenance and Care....................................................................................................... 38
10.01 Maintenance intervals.......................................................................................................... 38
10.02 Cleaning the machine .......................................................................................................... 38
10.03 Oiling the hook..................................................................................................................... 39
10.04 Oil reservoir for hook lubrication.......................................................................................... 39
10.05 Lubricating the bevel gears.................................................................................................. 40
10.06 Topping up the thread lubrication oil reservoir..................................................................... 41
10.07 Parameter settings ............................................................................................................. 41
11 Table Top............................................................................................................................ 42
11.01 Tilt base ............................................................................................................................... 42
11.02 Table top cutout................................................................................................................... 43
11.03 Table top assembly without -725/........................................................................................ 44
11.04 Table top assembly with -725/............................................................................................. 45
12 Wearing Parts..................................................................................................................... 46

Safety
5
1 Safety
1.01 Directives
The machine was built in compliance with the European regulations specified in the declara-
tion of conformity and declaration of incorporation.
As a supplement to this instruction manual, please also observe the generally applicable,
legal and other regulations and legislation – also in the country of use – and the valid
environmental protection regulations! Always comply with the locally applicable regulations
of the professional associations and other supervisory authorities!
1.02 General safety instructions
●The machine may only be operated after you have become acquainted with the associ-
ated instruction manual and only by operating personnel who have received appropriate
training!
●Always read the safety instructions and the instruction manual of the motor manufacturer
before starting up the machine!
●Always follow the hazard and safety instructions attached to the machine!
●The machine may only be operated for its intended purpose and only with the associated
safety covers, while adhering to all the relevant safety requirements.
●The machine must always be disconnected from the power supply by pressing the main
switch or pulling out the mains plug when sewing tools are replaced (such as the needle,
sewing foot, needle plate and bobbin) and when threading, leaving the workstation, or
performing maintenance!
●The daily maintenance work may only be carried out by suitably qualified personnel!
●Repairs and special maintenance work may only be carried out by technical staff or peo-
ple with appropriate training!
●Work on electrical equipment may only be carried out by qualified technical staff!
●Work on parts and equipment under voltage is not permitted!
●Exceptions are regulated by the EN 50110 standards.
●Modifications and changes to the machine may only be made in compliance with all of
the relevant safety requirements!
●Only those replacement parts approved by us for usage may be used for repairs! We
warn you expressly that spare parts and accessories that are not supplied by us are also
not tested and approved by us.
Fitting or using these products may therefore have negative effects on features which de-
pend on the machine design. We are not liable for any damage caused by the use of non-
Pfaff parts.

Safety
6
1.03 Safety symbols
Hazard point!
Special points of attention.
Risk of injury to operating personnel or technical staff!
Electric voltage!
Danger to operating personnel or technical staff
Danger of hands being crushed!
Danger to operating personnel or technical staff
Caution!
Do not operate without finger guard and safety covers!
Turn off the main switch before threading, changing the
bobbin or needle, cleaning, etc.!
1.04 Special points of attention for the owner-operator
●This instruction manual is a part of the machine and must be made available to the
operating personnel at all times. The instruction manual must have been read before the
initial start-up.
●The operating personnel and technical staff must be instructed about the machine's
safety covers and about safe working methods.
●The owner-operator may only operate the machine in a flawless condition.
●The owner-operator must ensure that no safety covers are removed or disabled.
●The owner-operator must ensure that only authorised persons work on the machine.
Additional information can be requested from the responsible sales centre.
I

Safety
7
1.05 Operating personnel and technical staff
1.05.01 Operating personnel
Operating personnel are persons responsible for equipping, operating and cleaning the
machine and for fault clearance in the sewing area.
The operating personnel are obligated to comply with the following points:
●The safety instructions provided in the instruction manual must be followed for all work!
●Any work method jeopardising machine safety must be refrained from!
●Tight-fitting clothing must be worn. The wearing of jewellery such as chains and rings is
prohibited!
●Care must be taken to ensure that no unauthorised persons are located in the machine's
hazard zone!
●Any changes occurring on the machine which impair its safety must be reported to the
owner-operator immediately!
1.05.02 Technical staff
Technical staff are persons with technical training in electricity/electronics and mechanics.
They are responsible for lubricating, servicing, repairing and adjusting the machine.
The technical staff are obligated to comply with the following points:
●The safety instructions provided in the instruction manual must be followed for all work!
●Turn off the main switch and secure it against reactivation before starting any adjustment
and repair work!
●Never work on live parts and equipment!
Exceptions are regulated by the EN 50110 standards.
●Reattach the safety covers following repair and maintenance work!

Safety
8
4
ABAB
D
CDCD
A
P1
~
P15
~
S1
S25
S2
S3
S4
S1 S2
S3
S4
S1
S1
S6
S5
P
OK n
+
-
+
-
+
-
+
-
A B C D
FESC
Fig. 1 - 01
1.06 Danger warnings
A work area of 1mmust be kept free in front of and behind the machine to en-
sure unobstructed access at all times.
Do not reach into the needle range during the sewing operation!
Risk of injury from the needle!
Do not allow any objects to be placed on the table during the adjustment work!
The objects could become jammed or be slung away!
Risk of injury from parts flying around!
Do not operate the machine without the take-up lever guard 1!
Risk of injury due to the motion of the take-up lever!
Do not operate the machine without the belt guard 2!
Risk of injury due to the rotating driving belt!
Do not operate the machine without the anti-tipping device 3!
Risk of injury by crushing between the sewing head and the table top!
Do not operate the machine without the support 4! Risk of damage due to the
top-heavy sewing head!
Machine can tip over backwards when moving it!
1
2
3
4

Proper Use
99
2 Proper Use
The PFAFF 571 is a single needle post-bed sewing machine (post is positioned to the left
of the needle) with powered feed wheel and roller presser plus feed-synchronised needle.
The PFAFF 574 is a two-needle post-bed sewing machine with powered feed wheel and
roller presser.
The PFAFF 591 is a single needle post-bed sewing machine (post is positioned to the right
of the needle) with powered feed wheel and roller presser plus feed-synchronised needle.
The machines are used to create double lock stitch seams in the leather and upholstery
industries.
Any usage not approved by the manufacturer is deemed misuse!
The manufacturer shall assume no liability for damage caused by misuse!
Proper use also includes compliance with the operating, maintenance,
adjustment and repair measures specified by the manufacturer!

Technical Data
10
3 Technical Data ▲
3.01 PFAFF 571
Stitch type:........................................................................................................301 (lock stitch)
Needle system :................................................................................................................... 134
Design BN5:..................................................... for the machining of medium-weight materials
Design CN5:.......................................................for the machining of medium-heavy materials
Needle size in 1/100 mm:
Model BN5:.................................................................................................................... 90 -110
Model CN5:................................................................................................................. 120 - 150
Stitch length max:..........................................................................................................5.0 mm
Speed max.:
Model BN5................................................................................................. 3000 stitches/min ◆
Model CN5................................................................................................. 2000 stitches/min ◆
Clearance beneath the roller presser:...............................................................................7 mm
Passage width: .............................................................................................................245 mm
Clearance height: ..........................................................................................................115 mm
Post height....................................................................................................................180 mm
Bed plate dimensions: ............................................................................................... 518 x 177
Sewing head dimensions:
Length:.............................................................................................................approx. 562 mm
Width: ..............................................................................................................approx. 250 mm
Height (above table):........................................................................................approx. 505 mm
Motor data: ..................................................................................see motor specification plate
Noise data:
Emissions sound pressure level in the workplace at n = 2400 min-1:...............LpA = 79 dB(A) ■
(Noise measurement in accordance with DIN 45 635-48-A-1,ISO 11204, ISO 3744, ISO 4871)
Net weight of sewing head: ................................................................................ approx. 62 kg
Gross weight of sewing head:............................................................................. approx. 70 kg
▲Subject to alterations.
◆Depending on the material, workstep and stitch length.
■KpA = 2,5 dB

Technical Data
11
3.02 PFAFF 574
Stitch type:........................................................................................................301 (lock stitch)
Needle system :.............................................................................................................. 134-35
Design BN3.6:.................................................. for the machining of medium-weight materials
Design CN:3.6....................................................for the machining of medium-heavy materials
Needle size in 1/100 mm:
Model BN3.6:................................................................................................................. 90 -110
Model CN3.6:.............................................................................................................. 120 - 150
Stitch length max:..........................................................................................................3.6 mm
Speed max.:
Model BN3.6.............................................................................................. 3000 stitches/min ◆
Model CN3.6.............................................................................................. 2000 stitches/min ◆
Clearance beneath the roller presser:...............................................................................7 mm
Passage width: .............................................................................................................245 mm
Clearance height: ..........................................................................................................115 mm
Post height....................................................................................................................180 mm
Bed plate dimensions: ............................................................................................... 518 x 177
Sewing head dimensions:
Length:.............................................................................................................approx. 562 mm
Width: ..............................................................................................................approx. 250 mm
Height ( above table ):......................................................................................approx. 505 mm
Motor data: ..................................................................................see motor specification plate
Noise data:
Emissions sound pressure level in the workplace at n = 1600 min-1:...............LpA = 75 dB(A) ■
(Noise measurement in accordance with DIN 45 635-48-A-1,ISO 11204, ISO 3744, ISO 4871)
Net weight of sewing head: ................................................................................ approx. 71 kg
Gross weight of sewing head:............................................................................. approx. 79 kg
▲Subject to alterations.
◆Depending on the material, workstep and stitch length.
■KpA = 2,5 dB

Technical Data
12
3.03 PFAFF 591
Stitch type:........................................................................................................301 (lock stitch)
Needle system :................................................................................................................... 134
Design BN5:..................................................... for the machining of medium-weight materials
Design CN7:.......................................................for the machining of medium-heavy materials
Needle size in 1/100 mm:
Model BN5:................................................................................................................... 90 - 110
Model CN7:................................................................................................................. 120 - 150
Stitch length max
Model BN5.:...................................................................................................................5.0 mm
Model CN7.....................................................................................................................7.0 mm
Speed max.:
Model BN5................................................................................................. 3000 stitches/min ◆
Model CN7................................................................................................. 2000 stitches/min ◆
Clearance beneath the roller presser:...............................................................................7 mm
Passage width: .............................................................................................................245 mm
Clearance height: ..........................................................................................................115 mm
Post height....................................................................................................................180 mm
Bed plate dimensions: ............................................................................................... 518 x 177
Sewing head dimensions:
Length:.............................................................................................................approx. 530 mm
Width: ..............................................................................................................approx. 177 mm
Height ( above table ):......................................................................................approx. 440 mm
Motor data: ..................................................................................see motor specification plate
Noise data:
Emissions sound pressure level in the workplace at n = 1600 min-1:...............LpA = 73 dB(A) ■
(Noise measurement in accordance with DIN 45 635-48-A-1,ISO 11204, ISO 3744, ISO 4871)
Net weight of sewing head: ................................................................................ approx. 69 kg
Gross weight of sewing head:............................................................................. approx. 77 kg
▲Subject to alterations.
◆Depending on the material, workstep and stitch length.
■KpA = 2,5 dB

Disposal of the Machine
13
4 Disposal of the Machine
●It is up to the customer to dispose of the machine properly.
●The materials used for the machine include steel, aluminium, brass and various plastics.
The electrical equipment consists of plastics and copper.
●The machine must be disposed of in accordance with the locally valid environmental
protection regulations, with a specialised company being contracted if necessary.
Please ensure that parts coated with lubricants are disposed of separately in
accordance with the locally valid environmental protection regulations!

Transport, Packaging and Storage
14
5 Transport, Packaging and Storage
5.01 Transport to the customer's premises
All machines are completely packed for delivery.
5.02 Transport within the customer's premises
The manufacturer assumes no liability for transports within the customer's premises or to
the individual usage sites. Please ensure that the machines are only transported in a vertical
position.
5.03 Disposal of the packaging materials
The packaging materials of these machines consists of paper, cardboard and VCI fleece. It is
up to the customer to dispose of the packaging properly.
5.04 Storage
The machine can be stored for up to 6months when not in use. It must then be protected
from dirt and moisture. For longer storage periods, the machine's single components, espe-
cially its sliding surfaces, must be protected against corrosion, e.g. by an oil film.

Work Symbols
15
6 Work Symbols
Activities to be performed or important information in this instruction manual are
emphasised by symbols. The symbols used have the following meaning:
Note, information
Cleaning, care
Lubrication
Maintenance, repairs, adjustment, service work
(only to be carried out by technical staff)

Operating Controls
16
7.02 Buttons on the machine head (only in machines with backtacking system -911/..)
●The machine sews backwards as long
as the button 1is pressed during the
sewing operation.
●The buttons 2can be assigned through
the parameter setting (see separate pa-
rameter list).
●The sewing lamp integrated on the ma-
chine head is switched on and off with
the button 3.
Fig. 7 - 02
7 Operating Controls
7.01 Main switch
Fig. 7 - 01 a
2
BA-P-114_Fig-7-01
1
2
3
Before switching on the machine, raise the take-up lever as far as possible.
Fig. 7 - 01
1
●Operating the master switch 1switches
the machine on and off.
Machines without -725/04 Machines with -725/04
●Turning the main switch 1switches the
machine on and off.

Operating Controls
17
7.03 Bobbin thread monitoring using stitch counting
●The diode 1flashes on reaching the
predefined stitch count.
●The stitch counting re-starts after cut-
ting the thread and changing the bob-
bin.
For presetting the stitch count
please refer to the separate in-
struction manual for the drive
(see Chapter 5.3.1 Setting the
bobbin-stitch counter).
Fig. 7 - 03
1
7.04 Pedal
●With the main switch turned on
0 = Neutral position
+1= Sewing
-1= Raise roller presser
-2= Trim thread/
(in machines with thread
trimmer -900/83)
0
-2
-1
Fig. 7 - 04
+1

Operating Controls
18
Fig. 7 - 05
7.05 Hand lever to raise the roller presser
●Turning the hand lever 1raises the roll-
er presser.
7.06 Swivelling out the roller presser
●The roller presser can be swivelled out
by gently pulling downwards when the
roller presser is in the raised position.
Fig. 7 - 06
1
1

Operating Controls
19
7.07 Button for stitch length regulation
●Pressing the reverse-feed lever 1and
turning the hand wheel adjusts the stitch
length, see Chapter 9.07 Adjusting
stitch lengths.
Fig. 7 - 07
1
7.08 Knee lever
●Pressing the knee lever 1in the direction
shown by the arrow raises the roller
presser.
Fig. 7 - 08
1
018

Operating Controls
20
Fig. 7 - 09
7.09 Edge trimmer -725/04 for PFAFF 571
Do not reach into the blade dur-
ing operation! Risk of injury!
Switching on the knife drive:
●Swivel the lever 1backwards; the knife
moves to the operating position.
Switching off the knife drive:
●Press the lever 1; the knife swivels away
backwards.
Switching on the edge guide:
●Swing in the edge guide 2by hand and
press the lever 3; the edge guide 2
moves to the operating position.
Switching off the edge guide:
●Raise the edge guide 2and allow it
to engage; the edge guide 2is out of
operation.
●Raise the lever 4; the edge guide swivels
away backwards.
Replacing knives:
The work described below may only be carried out by technical staff or people
with appropriate training!
●Switch the machine off.
●Release the screw 5and remove the knife 6.
●Insert a new knife and gently tighten the screw 5.
●Adjust the knife as described in Chapter 13.05.05 Knife movement of the settings man-
ual and tighten the screw 5.
1
3
24
5
6