Pfaff 571 User manual

571
574
Instruction Manual
296-12-18 461/002
Betriebsanleitung engl. 01.03
591
This instruction manual applies to machines from the
following serial numbers onwards:
PFAFF 571 # 2574794
PFAFF 574 # 2574796
PFAFF 591 # 2574800

This instruction manual applies to all versions and subclasses listed under
"Specifications".
Reprinting, copying or translation of PFAFF instruction manuals, whether in whole or in part, is
not permitted without our prior permission and not without written indication of the source.
PFAFF Industrie Maschinen AG
Postfach 3020
D-67653 Kaiserslautern
Königstr. 154
D-67655 Kaiserslautern
Editing/illustrations
Verlag TD
D-77901 Lahr

Index
Contents ................................................................................. Chapter - Page
1Safety ........................................................................................................................... 1 - 1
1.01 Directives ...................................................................................................................... 1 - 1
1.02 General notes on safety ................................................................................................ 1 - 1
1.03 Safety symbols ............................................................................................................. 1 -2
1.04 Important points for the user ........................................................................................ 1 - 2
1.05 Operating and specialist personnel ............................................................................... 1 - 3
1.05.01 Operating personnel...................................................................................................... 1- 3
1.05.02 Specialist personnel ......................................................................................................1- 3
1.06 Danger .......................................................................................................................... 1 - 4
2Proper use.................................................................................................................... 2 -1
3Specifications .............................................................................................................. 3 - 1
3.01 PFAFF 571, 574, 591..................................................................................................... 3 - 1
3.02 Needles and threads ..................................................................................................... 3 - 2
3.03 Possible models and subclasses................................................................................... 3 - 2
4Disposal of Machine.................................................................................................... 4 - 1
5Transportation, packing and storage ......................................................................... 5 - 1
5.01 Transportation to customer's premises ........................................................................ 5 - 1
5.02 Transportation inside the customer's premises ............................................................ 5 - 1
5.03 Disposal of packing materials........................................................................................ 5 - 1
5.04 Storage ......................................................................................................................... 5 - 1
6Explanation of symbols .............................................................................................. 6 - 1
7Controls ....................................................................................................................... 7- 1
7.01 On / off switch ..............................................................................................................7- 1
7.02 Keys on the machine head (only for machines with –911/..). ........................................ 7 - 1
7.03 Bobbin thread monitoring with stitch counting.............................................................. 7 - 2
7.04 Pedal ............................................................................................................................. 7 - 2
7.05 Lever for lifting roller presser ........................................................................................ 7 - 3
7.06 Knee lever ..................................................................................................................... 7 - 3
7.07 Key for setting stitch length .......................................................................................... 7 - 4
7.08 Swing out roller presser ................................................................................................ 7 - 4
7.09 Edge trimmer -725/04 for 571 ...................................................................................... 7 - 5
7.10 Edge trimmer -725/04 for 574 and 591......................................................................... 7 - 6
7.11 Edge trimmer -726/05 for 591 ....................................................................................... 7 - 7
8Installation and commissioning ................................................................................. 8 - 1
8.01 Installation..................................................................................................................... 8 - 1
8.01.01 Adjusting the table height ............................................................................................. 8 - 1
8.01.02 Fitting the tilt lock.......................................................................................................... 8 - 2
8.01.03 Adjusting the V-belt tension (does not apply to machines with flange motor)............... 8 - 2
8.01.04 Fitting the v-belt guard ..................................................................................................8- 3
8.01.05 Mounting the lower V-belt guard (does not apply to machines with flange motor) ....... 8 - 3
8.01.06 Mounting the synchronizer (does not apply to machines with flange motor) ................ 8 - 4
8.01.07 Fitting the reel stand ..................................................................................................... 8 - 4
8.02 Mounting the flange motor ........................................................................................... 8 - 5
8.02.01 Mounting the flange motor to the bearing plate............................................................ 8 - 5
8.02.02 Mounting the flange motor to the machine................................................................... 8 - 5
8.02.03 Mounting the toothed belt and adjusting the tension.................................................... 8 - 6
8.02.04 Mounting the belt guard of the flange motor ................................................................ 8 - 6

Index
Contents ................................................................................. Chapter - Page
8.02.05 Connecting the safety switch ....................................................................................... 8 - 7
8.03 Connecting the earth cable ........................................................................................... 8 - 7
8.04 Basic position of the machine drive unit........................................................................ 8 - 8
8.05 Tilted work base............................................................................................................ 8- 8
8.06 Table top cutout ............................................................................................................ 8- 9
8.07 Commissioning ............................................................................................................. 8 -10
8.08 Switching the machine on/off ....................................................................................... 8 -10
9Setting up .................................................................................................................... 9 -1
9.01 Inserting the needle on model 571 and 591 .................................................................. 9 - 1
9.02 Inserting the needle on model 574................................................................................ 9 - 2
9.03 Winding the bobbin thread; adjusting the primary thread tension ................................. 9 - 3
9.04 Removing / Inserting the bobbin case ........................................................................... 9 - 4
9.05 Threading the bobbin case / Adjusting the bobbin thread tension ................................. 9 - 4
9.06 Threading the needle thread and regulating its tension on model 571 and 591............. 9 - 5
9.07 Threading the needle thread and regulating its tension on model 574 .......................... 9 - 6
9.08 Setting the stitch length ................................................................................................ 9 - 7
9.09 Setting the stitch counting function for bobbin thread monitoring ................................ 9 - 8
10 Care and maintenance .............................................................................................. 10 - 1
10.01 Cleaning ...................................................................................................................... 10 - 1
10.02 Oiling the hook ............................................................................................................ 10- 2
10.03 Oil bowl for hook lubrication........................................................................................ 10 - 3
10.04 Filling the oil reservoir of the thread lubrication unit .................................................... 10 - 3
10.05 Oiling the edge trimmer -726/05 ................................................................................. 10 - 3
10.06 Lubricating the bevel gears ......................................................................................... 10 - 4
10.07 Checking/adjusting the air pressure ............................................................................ 10 - 5
10.08 Cleaning the air filter of the air-filter/lubricator............................................................. 10 - 6
11 Adjustment ................................................................................................................ 11 - 1
11.01 Notes on adjustment................................................................................................... 11 - 1
11.02 Tools, gauges and other accessories .......................................................................... 11 - 1
11.03 Abbreviations .............................................................................................................. 11- 1
11.04 Adjusting the basic machine .................................................................................... 11 - 2
11.04.01 Adjusting the synchronizer (does not apply to machines with flange motor) .............. 11 - 2
11.04.02 Needle position in sewing direction on the PFAFF 571 and 591.................................. 11 - 3
11.04.03 Needle position in sewing direction on the PFAFF 574 ............................................... 11 - 4
11.04.04 Preliminary adjustment of the needle height............................................................... 11 - 5
11.04.05 Needle rise, hook clearance, needle height and needle guard on the PFAFF 571 ....... 11 - 6
11.04.06 Needle rise, hook clearance, needle height and needle guard on the PFAFF 574 ....... 11 - 8
11.04.07 Needle rise, hook clearance, needle height and needle guard on the PFAFF 591 ....... 11 -10
11.04.08 Needle position crosswise to sewing direction on the PFAFF 571.............................. 11 -12
11.04.09 Needle position crosswise to sewing direction on the PFAFF 574.............................. 11 -13
11.04.10 Needle position crosswise to sewing direction on the PFAFF 591.............................. 11 -14
11.04.11 Height of the bobbin-case opener ............................................................................... 11 -15
11.04.12 Height of the feed wheel on the PFAFF 571 ............................................................... 11 -16
11.04.13 Height of the feed wheel on the PFAFF 574 ............................................................... 11 -17
11.04.14 Height of the feed wheel on the PFAFF 591 ............................................................... 11 -18
11.04.15 Stitch length control eccentric..................................................................................... 11 -19
11.04.16 Stitch length scale disk ............................................................................................... 11 -20
11.04.17 Shaft crank to feed wheel drive .................................................................................. 11 -21
11.04.18 Shaft crank to roller presser drive ............................................................................... 11 -22

Index
Contents ................................................................................. Chapter - Page
11.04.19 Clearance between roller presser and feed wheel ...................................................... 11 -23
11.04.20 Roller presser.............................................................................................................. 11 -24
11.04.21 Stitch length on stitch length scale ............................................................................. 11 -25
11.04.22 Synchronization of roller presser and feed wheel........................................................ 11 -26
11.04.23 Retainer (only on model 574) ...................................................................................... 11 -27
11.04.24 Knee lever ................................................................................................................... 11 -28
11.04.25 Needle thread tension release .................................................................................... 11 -29
11.04.26 Thread check spring (PFAFF 571 and 591) .................................................................. 11 -30
11.04.27 Thread check springs (PFAFF 574).............................................................................. 11 -31
11.04.28 Bobbin winder .............................................................................................................11-32
11.04.29 Pressure of roller presser............................................................................................ 11 -33
11.04.30 Lubrication .................................................................................................................. 11 -34
11.04.31 Re-engage safety coupling.......................................................................................... 11 -35
11.05 Adjusting the edge trimmer -725/04 ........................................................................ 11 -36
11.05.01 Position knife holder on model 571 ............................................................................. 11 -36
11.05.02 Position knife holder on models 574 and 591.............................................................. 11 -37
11.05.03 Knife stroke on model 571 .......................................................................................... 11 -38
11.05.04 Knife stroke on models 574 and 591........................................................................... 11 -39
11.05.05 Cutting stroke on model 571...................................................................................... 11 -40
11.05.06 Cutting stroke on models 574 and 591 ....................................................................... 11 -41
11.05.07 Knife position .............................................................................................................. 11 -42
11.06 Adjusting the thread trimmer -726/05 on model 591............................................. 11 -43
11.06.01 Position of the knife to the needle plate...................................................................... 11 -43
11.06.02 Knife position crosswise to sewing direciton .............................................................. 11 -44
11.06.03 Knife height................................................................................................................. 11 -45
11.06.04 Cutting stroke ............................................................................................................. 11 -46
11.06.05 Knife stroke................................................................................................................. 11 -47
11.07 Adjusting the thread trimmer -900/81...................................................................... 11 -48
11.07.01 Resting position of the roller lever / radial position of the control cam ........................ 11 -48
11.07.02 Position of the thread catcher holder .......................................................................... 11 -48
11.07.03 Distance between thread catcher and needle plate .................................................... 11 -49
11.07.04 Position of the thread catcher ..................................................................................... 11 -50
11.07.05 Knife position and knife pressure ................................................................................ 11 -51
11.07.06 Bobbin thread retaining spring .................................................................................... 11 -52
11.07.07 Manual cutting test ..................................................................................................... 11-53
11.07.08 Releasing the tension.................................................................................................. 11 -54
11.07.09 Linkage rod (only for the PFAFF 574) .......................................................................... 11 -55
11.08 Adjustment of backtacking mechanism -911/.......................................................... 11 -56
11.08.01 Needle in needle hole (only for PFAFF 571 and 591) ................................................... 11 -56
11.08.02 Coupling for roller presser drive .................................................................................. 11 -57
11.08.03 Bevel gears for feed wheel drive (on the PFAFF 571 and 574).................................... 11 -58
11.08.04 Bevel gear play (on the PFAFF 571 and 574)............................................................... 11 -59
11.08.05 Bevel gears for feed wheel drive (on the PFAFF 591) ................................................. 11 -60
11.08.06 Bevel gear play (on the PFAFF 591) ............................................................................ 11 -61
11.09 Parameter settings .................................................................................................... 11 -62
12 Wearing parts.............................................................................................................. 12 - 1
13 Circuit diagrams .......................................................................................................... 13 - 1

Safety
1 - 1
1 Safety
1.01 Directives
This machine is constructed in accordance with the European regulations contained in the
conformity and manufacturer’s declarations.
In addition to this Instruction Manual, observe also all generally accepted, statutory and
other regulations and legal requirements and all valid environmental protection regulations!
The regionally valid regulations of the social insurance society for occupational accidents or
other supervisory organisations are to be strictly adhered to!
1.02 General notes on safety
●This machine may only be operated by adequately trained operators and only after the
Instruction Manual has been completely read and understood!
●All Notes on Safety and Instruction Manuals of the motor manufacturer are to be read
before operating the machine!
●The danger and safety instructions on the machine itself are to be followed!
●This machine may only be used for the purpose for which it is intended and may not be
operated without its safety devices. All safety regulations relevant to its operation are to
be adhered to.
●When exchanging sewing tools (e.g. needle, roller presser, needle plate or bobbin), when
threading the machine, when leaving the machine unattended and during maintenance
work, the machine is to be separated from the power supply by switching off the On/Off
switch or by removing the plug from the mains!
●Everyday maintenance work is only to be carried out by appropriately trained personnel!
●Repairs and special maintenance work may only be carried out by qualified service staff
or appropriately trained personnel!
●Work on electrical equipment may only be carried out by appropriately trained personnel!
●Work is not permitted on parts and equipment which are connected to the power supply!
Exceptions to this are only to be found in the regulations EN 50110.
●Modifications and alterations to the machine may only be carried out under observance
of all the relevant safety regulations!
●Only spare parts which have been approved by us are to be used for repairs! We
expressly point out that any replacement parts or accessories, which are not supplied by
us, have not been tested and approved by us. The installation and/or use of any such
products can lead to negative changes in the structural characteristics of the machine.
We shall not be liable for any damage which may be caused by non-original parts.

Safety
1 - 2
1.03 Safety symbols
Danger!
Points to be observed.
Danger of injury for operating and specialist personnel!
!
1.04 Important points for the user
●This Instruction Manual is a component part of the machine and must be available to the
operating personnel at all times.
●The Instruction Manual must be read before operating the machine for the first time.
●The operating and specialist personnel is to be instructed as to the safety equipment of
the machine and regarding safe work methods.
●It is the duty of the user to only operate the machine in perfect running order.
●It is the obligation of the user to ensure that none of the safety mechanisms are removed
or deactivated.
●It is the obligation of the user to ensure that only authorized persons operate and work on
the machine.
Further information can be obtained from your PFAFF agent.
I
Caution
Do not operate without finger guard and safety devices.
Before threading, changing bobbin and needle, cleaning
etc. switch off main switch.

Safety
1 - 3
1.05 Operating and specialist personnel
1.05.01 Operating personnel
Operating personnel are persons responsible for the equipping, operating and cleaning of the
machine as well as taking care of faults arising in the sewing area.
The operating personnel is obliged to observe the following points and must:
●always observe the Notes on Safety in the Instruction Manual!
●never use any working methods which could limit the level of safety in using the
machine!
●not wear loose-fitting clothing or jewellery such as chains or rings!
●also ensure that only authorized persons have access to the potentially dangerous area
around the machine!
●always immediately report to the person responsible any changes in the machine which
may limit its safety!
1.05.02 Specialist personnel
Specialist personnel are persons with a specialist education in the fields of electrics,
electronics and mechanics. They are responsible for the lubrication, maintenance, repair and
adjustment of the machine.
The specialist personnel is obliged to observe the following points and must:
●always observe the Notes on Safety in the Instruction Manual!
●switch off the On/Off switch before carrying out adjustments or repairs and ensure that it
cannot be switched on again unintentionally!
●never work on parts which are still connected to the power supply! Exceptions are
contained only in the regulations EN 50110.
●replace the protective coverings and close the electrical control box after all repairs or
maintenance work!

Safety
1 - 4
Fig. 1 - 01
5
2
1
61-002
6
4
3
Switch the machine off before tilting it backwards!
Danger of injury if the machine is started accidentally!
Do not operate the machine without its take-up-lever guard 2!
Danger of injury due to the motion of the take-up lever!
On machines with thread lubricator, only operate the machine with the eye
guard 3lowered!
The eye guard 3protects the eyes from oil particles from the thread lubrication.
Do not operate the machine without belt guard 4and 5!
Danger of injury by rotating drive belt!
Do not operate the machine without tilt lock 6!
Danger of crushing between sewing head and table top!
1.06 Danger
A working area of 1 meter is to be kept free both in front of and behind the
machine while it is in operation so that it is always easily accessible.
Never reach into the sewing area while sewing! Danger of injury by the needle!
Never leave objects on the table while adjusting the machine settings!
Objects canbecome trapped or be slung away!Danger of injury!
Do not operate the machine without support 1! Danger due to top-heavy sewing head!
Machine can tip over backwards when tilted!

Proper use
2 - 1
2 Proper use
The PFAFF 571 is a single needle, high-speed post bed sewing machine (post to the left
of the needle) with driven feed wheel and roller presser and synchronized
needle.
The PFAFF 574 is a two-needle, high-speed post bed sewing machine with driven feed
wheel and roller presser
The PFAFF 591 is a single needle, high-speed post bed sewing machine (post to the right
of the needle) with driven feed wheel and roller presser and synchronized
needle.
The machines are used for sewing lockstitch seams in the leather and upholstery industries.
Any use of these machines which is not approved by the manufacturer shall be
considered as improper use! The manufacturer shall not be liable for any dam-
age arising out of improper use! Proper use shall also be considered to include
compliance with the operation, adjustment, service and repair measures speci-
fied by the manufacturer!

Specifications
3 - 1
3 Specifications
3.01 PFAFF 571, 574 , 591 ▲
Stitch type:....................................................................................................... 301 (lockstitch)
Handwheel eff. dia.: ...................................................................................................... 65 mm
Clearance under roller presser: ....................................................................................... 7 mm
Clearance width: ......................................................................................................... 245 mm
Clearance height: ........................................................................................................ 115 mm
Post height:................................................................................................................. 180 mm
Sewing head dimensions:
Length:........................................................................................................... approx. 615 mm
Width: ............................................................................................................ approx. 240 mm
Height (above table): ...................................................................................... approx. 500 mm
Bedplate dimensions:........................................................................................ 518 x 177 mm
Max. speed:
PFAFF 571, 574, 591 Model A + B......................................................................... 3000 spm ◆
PFAFF 574, 591 Model C ....................................................................................... 2000 spm ◆
Cutting depth (for –725/.. and –726/..): ................................................................ 0.8 – 2.5 mm
Cutting speed (for –725/.. and –726/..): .............................................................2800 cuts/min.
Connection data:
Operating voltage:................................................................................230 V ± 10%, 50/60 Hz
Max. power consumption: ........................................................................................... 1.2 kVA
Fuse protection: ................................................................................................. 1 x 16 A, inert
Noise data:
Emission sound level at the workplace at appropriate speed
(Noise measurement in accordance with DIN 45 635-48-A-1, ISO 11204, ISO 3744, ISO
4871)
PFAFF 571 and 591, model A + B at a speed of 2400 spm.:............................ LpA =79 dB(A) ■
PFAFF 574, model C at a speed of 1600 spm.: ................................................ LpA =75 dB(A) ■
PFAFF 591, model C at a speed of 1600 spm.: ................................................ LpA =73 dB(A) ■
Net weight of sewing head: ................................................................................ approx. 61 kg
Gross weight of sewing head: ............................................................................ approx. 71 kg
▲ Subject to alteration
◆ Dependent on material, work operation and stitch length
■KpA = 2,5 dB

Specifications
3 - 2
3.02 Needles and threads
Thread thickness▲(Nm)
max. synthetic
Model
A 60/3 70 134 - 134
Needle thickness in 1/100 mm
Needle system for PFAFF 571
▲ or similar strengths of other types of thread
3.03 Possible models and subclasses
PFAFF 571, 591
Model A ................................................................................ For sewing lightweight materials
PFAFF 571, 591
Model B .........................................................................For sewing medium-weight materials
PFAFF 574, 591
Model C .......................................................................... For sewing medium-heavy materials
Additionalequipment:
Subclass -725/04 .................................................................................................Edge trimmer
Subclass -726/05 .................................................................................................Edge trimmer
Subclass -900/81 .............................................................................................. Thread trimmer
Subclass -910/15 .......................................................................... Automatic presser foot lifter
Subclass -911/35 ....................................................................................................... Bartacker
Subclass -940/02 ...................................................... Needle plate rounded in sewing direction
Needle system for PFAFF 574 Needle system for PFAFF 591
B 40/3 100 134 134 - 35 134
C 15/3 130 - 134 - 35 134

Disposal of Machine
4 - 1
4 Disposal of Machine
●Proper disposal of the machine is the responsibility of the customer.
●The materials used for the machine are steel, aluminium, brass and various plastic mat-
erials.
The electrical equipment comprises plastic materials and copper.
●The machine is to be disposed of according to the locally valid pollution control regula-
tions; if necessary, a specialist ist to be commissioned.
Care must be taken that parts soiled with lubricants are disposed of separately
according to the locally valid pollution control regulations!

Transportation, packing and storage
5 - 1
5 Transportation, packing and storage
5.01 Transportation to customer's premises
Within the Federal Republic of Germany, complete machines (with table and motor) are
delivered without packing.
Machines without table (only sewing heads) and machines intended for export are packed.
5.02 Transportation inside the customer's premises
The manufacturer cannot be made liable for transportation inside the customer's premises
nor to other operating locations. It must be ensured that the machines are only transported
in an upright position.
5.03 Disposal of packing materials
The packing materials of this machine comprise paper, cardboard and VCE fibre. Proper dis-
posal of the packing material is the responsibility of the customer.
5.04 Storage
If the machine is not in use, it can be stored as it is for a period of up to six months, but It
should be protected against dust and moisture.
If the machine is stored for longer periods, the individual parts, especially the surfaces of
moving parts, must be protected against corrosion, e.g. by a film of oil.

Explanation of symbols
6 - 1
6 Explanation of symbols
In this instruction manual, work to be carried out or important information is accentuated by
symbols. These symbols have the following meanings:
Note, information
Cleaning, care
Lubrication
Maintenance, repairs, adjustment, service work
(only to be carried out by technical staff)

Controls
7 - 1
61-004
0
Fig. 7 - 02
1
2
7.02 Keys on the machine head (only for machines with –911/..)
●As long as key 1is pressed during
sewing, the machine sews in reverse.
●Keys 2can be used for parameter
settings, see Chapter 11.09 Parameter
settings.
7 Controls
7.01 On/off switch
●Turn the machine on and off by turning
switch 1and pressing switch 2.
On machines without edge
trimming device –725/.. or
–726/.. there is no switch 1.
Fig. 7 - 01
2
1

Controls
7 - 2
7.03 Bobbin thread monitoring with stitch counting
Machines without –911/..
●Once the preset number of stitches have
been sewn, the machines stops.
●After the thread has been trimmed and
the bobbin changed, the stitch counting
begins anew.
Machines with 911/..
●About 100 stitches before reaching the
preset number of stitches, LED 1flashes.
●After the thread has been trimmed and
the bobbin changed, the stitch counting
begins anew.
Presetting the number of
stitches, see Chapter 9.09 Set-
ting the stitch counting
function for bobbin thread
monitoring.
7.04 Pedal
0= Neutral position
1= Sewing
2= Raise roller presser (on
machines with -910/..)
3= Trim sewing threads (on
machines with -900/..)
Fig. 7 - 04
0
1
23
Fig. 7 - 03
1

Controls
7 - 3
61 068
61-006
7.05 Lever for lifting roller presser
●The roller presser can be raised by
turning lever 1.
Fig. 7 - 05
1
7.06 Knee lever
●The roller presser can be raised by
pressing the knee lever 1in the direction
of the arrow.
1
Fig. 7 - 06

Controls
7 - 4
61-069
61-007
7.07 Key for setting stitch length
Fig. 7 - 07
●The stitch length is set by pressing key 1
and turning the balance wheel (see
Chapter 9.08 Setting the stitch length).
7.08 Swing out roller presser
●When the roller presser is raised, it can
be swung out by pulling it lightly
downwards.
Fig. 7 - 08
1
1

Controls
7 - 5
7.09 Edge trimmer -725/04 for 571
Keep your hands away from the
moving knife! Danger of injury!
Switch on knife drive:
●Move lever 1backwards. The knife
moves into operating position.
Switch off knife drive:
●Press lever 1. The knife swings
backwards.
Switch on edge guide:
●Swing edge guide 2into position by hand
and press lever 3. The edge guide 2
moves into its operating position.
Switch off edge guide:
●Raise edge guide 2and let it click into
position. The edge guide 2is out of
operation.
●Raise lever 4. The edge guide swings
backwards.
Changing the knife:
The following work may only be carried out by technical staff or by persons who
have been properly instructed.
●Switch off the machine.
●Loosen screw 5and remove knife 6.
●Insert new knife and slightly tighten screw 5.
●Adjust the knife according to Chaper 11.05.05 Cutting stroke and tighten screw 5.
61-070
Fig. 7 - 09
3
2 4
1
6
5