Pfaff 471 User manual

471
474
Instruction Manual
296-12-18 398/002
Betriebsanleitung engl. 12.99
491
This instruction manual applies to machines from the
following serial numbers onwards:
PFAFF 471 # 2560474
PFAFF 474 # 2561194
PFAFF 491 # 2561421

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
notpermittedwithoutourpriorpermissionandnotwithoutwrittenindicationofthesource.
G.M. PFAFF KAISERSLAUTERN
INDUSTRIEMASCHINEN 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 Generalnotes onsafety................................................................................................. 1 - 1
1.03 Safety symbols ............................................................................................................. 1 -2
1.04 Importantpointsfortheuser.......................................................................................... 1 - 2
1.05 Operatingandspecialistpersonnel ................................................................................ 1 - 3
1.05.01 Operatingpersonnel....................................................................................................... 1 - 3
1.05.02 Specialistpersonnel....................................................................................................... 1 - 3
1.06 Danger ........................................................................................................................... 1 - 4
2Properuse.................................................................................................................... 2 -1
3Specifications .............................................................................................................. 3 - 1
3.01 PFAFF471, 474,491 ..................................................................................................... 3 - 1
3.02 Needlesandthreads...................................................................................................... 3 - 2
3.03 Possible models and subclasses................................................................................... 3 - 2
4Disposal of Machine.................................................................................................... 4 - 1
5Transportation,packingand storage ......................................................................... 5 - 1
5.01 Transportationtocustomer'spremises ......................................................................... 5 - 1
5.02 Transportationinsidethecustomer'spremises ............................................................. 5 - 1
5.03 Disposal of packing materials........................................................................................ 5 - 1
5.04 Storage .......................................................................................................................... 5 - 1
6Explanationof symbols............................................................................................... 6 - 1
7Controls........................................................................................................................7- 1
7.01 On / off switch on machines with mini-stop motor
withoutedgetrimmer -725/.. or-726/.. .......................................................................... 7 - 1
7.02 On / off switch on machines with mini-stop motor
and edge trimmer -725/.. or -726/.. ................................................................................ 7 - 1
7.03 Button on machine head (only on machines with -911/..) ............................................. 7 - 2
7.04 Pedal ............................................................................................................................. 7 - 2
7.05 Leverforliftingrollerpresser.......................................................................................... 7 - 3
7.06 Kneelever ..................................................................................................................... 7 - 3
7.07 Keyfor settingstitchlength ........................................................................................... 7 - 4
7.08 Swingoutrollerpresser ................................................................................................. 7 - 4
7.09 Edgetrimmer -725/04 for471 ....................................................................................... 7 - 5
7.10 Edge trimmer -725/04 for 474 and 491.......................................................................... 7 - 6
7.11 Edgetrimmer-726/05for491 ........................................................................................ 7 - 7
8Installation and commissioning ................................................................................. 8 - 1
8.01 Installation..................................................................................................................... 8 - 1
8.01.01 Adjustingthetableheight .............................................................................................. 8 - 1
8.01.02 Fittingthetilt lock .......................................................................................................... 8 - 2
8.01.03 Tensioning the v-belt (does not apply to machines with mini-stop motor)...................... 8 - 2
8.01.04 Fittingthev-beltguard ................................................................................................... 8 - 3
8.01.05 Fitting the bottom v-belt guard (does not apply to machines with mini-stop motor) ....... 8 - 3
8.01.06 Fittingthesynchronizer .................................................................................................. 8 - 4
8.01.07 Fittingthereelstand ...................................................................................................... 8 - 4
8.02 Commissioning ............................................................................................................. 8 - 5

Index
Contents ..................................................................................Chapter - Page
8.03 Switching the machine on / off ...................................................................................... 8 - 5
9Settingup..................................................................................................................... 9- 1
9.01 Insertingthe needleon model471 and491.................................................................... 9 - 1
9.02 Insertingtheneedleonmodel474 ................................................................................. 9 - 2
9.03 Windingthebobbinthread;adjustingtheprimarythreadtension ................................... 9 - 3
9.04 Removing / Inserting the bobbin case............................................................................ 9 - 4
9.05 Threadingthebobbincase /Adjusting thebobbinthreadtension ................................... 9 - 4
9.06 Threadingtheneedlethreadandregulatingitstensiononmodel471/491 ...................... 9 - 5
9.07 Threadingtheneedlethreadandregulating itstensiononmodel474............................. 9 - 6
9.08 Settingthestitchlength ................................................................................................. 9 - 7
10 Careandmaintenance................................................................................................10 - 1
10.01 Cleaning .......................................................................................................................10 - 1
10.02 Oilingthehook .............................................................................................................10 - 2
10.03 Fillingtheoil reservoirofthethreadlubrication unit.......................................................10 - 3
10.04 Lubricatingthe bevelgears ...........................................................................................10 - 3
10.05 Checking / adjusting the air pressure ............................................................................10 - 4
10.06 Cleaning the air filter of the air-filter / lubricator .............................................................10 - 4
11 Adjustment..................................................................................................................11 - 1
11.01 Notesonadjustment ....................................................................................................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 Adjustingthesynchronizer............................................................................................11 - 2
11.04.02 Needle positionin sewingdirection onthe PFAFF471 and491.....................................11 - 3
11.04.03 Needleposition insewing directiononthe PFAFF474 ..................................................11 - 4
11.04.04 Preliminaryadjustmentoftheneedleheight .................................................................11 - 5
11.04.05 Needle rise,hook clearance,needleheight andneedle guardon thePFAFF471...........11 - 6
11.04.06 Needle rise,hook clearance,needleheight andneedle guardon thePFAFF474...........11 - 8
11.04.07 Needle rise,hook clearance,needleheight andneedle guardon thePFAFF491...........11 - 10
11.04.08 Needlepositioncrosswisetosewingdirection onthe PFAFF471.................................11 - 12
11.04.09 Needlepositioncrosswisetosewingdirection onthe PFAFF474.................................11 - 13
11.04.10 Needlepositioncrosswisetosewingdirection onthe PFAFF491.................................11 - 14
11.04.11 Heightofthebobbin-caseopener..................................................................................11 - 15
11.04.12 Bobbin-caseopenerstroke ...........................................................................................11 - 16
11.04.13 Heightofthefeed wheelonthePFAFF471 ..................................................................11 -17
11.04.14 Heightofthefeed wheelonthePFAFF474 ..................................................................11 - 18
11.04.15 Heightofthefeed wheelonthePFAFF491 ..................................................................11 - 19
11.04.16 Stitchlengthcontroleccentric.......................................................................................11 -20
11.04.17 Stitch length scale disk.................................................................................................11 - 21
11.04.18 Shaft crank to feed wheel drive ....................................................................................11 - 22
11.04.19 Shaftcrankto roller presser drive .................................................................................11 - 23
11.04.20 Clearancebetweenrollerpresserandfeedwheel.........................................................11 - 24
11.04.21 Rollerpresser ...............................................................................................................11 - 25
11.04.22 Stitchlengthon stitch length scale ...............................................................................11 - 26
11.04.23 Synchronizationofrollerpresserandfeedwheel ..........................................................11 - 27
11.04.24 Retainer (only on model 474) ........................................................................................11 - 28
11.04.25 Kneelever ....................................................................................................................11 - 29

Index
Contents ..................................................................................Chapter - Page
11.04.26 Needlethreadtensionrelease.......................................................................................11 - 30
11.04.27 Threadcheck spring .....................................................................................................11-31
11.04.28 Bobbinwinder ..............................................................................................................11 - 32
11.04.29 Pressureofrollerpresser ..............................................................................................11-33
11.04.30 Re-engagesafetycoupling ...........................................................................................11 - 34
11.05 Adjustingtheedgetrimmer-725/04...........................................................................11 -35
11.05.01 Positionknifeholderonmodel471 ...............................................................................11 - 35
11.05.02 Positionknifeholder onmodels474 and 491................................................................11 - 36
11.05.03 Knifestroke onmodel 471 ............................................................................................11 - 37
11.05.04 Knife stroke on models 474 and 491.............................................................................11 - 38
11.05.05 Cuttingstrokeon model 471........................................................................................11 - 39
11.05.06 Cuttingstrokeon models474and 491..........................................................................11 - 40
11.05.07 Knifeposition ................................................................................................................11 - 41
11.06 Adjustingthe threadtrimmer -726/05 onmodel491................................................11 -42
11.06.01 Positionof theknife tothe needleplate ........................................................................11 - 42
11.06.02 Knifeposition crosswisetosewingdireciton ................................................................11 - 43
11.06.03 Knifeheight ..................................................................................................................11 - 44
11.06.04 Cuttingstroke ...............................................................................................................11 - 45
11.06.05 Knifestroke ..................................................................................................................11 - 46
11.07 Adjustingthethreadtrimmer-900/53 ........................................................................11 -47
11.07.01 Removingthecutter .....................................................................................................11 - 47
11.07.02 Controlcamwithrespecttobobbinopenerandtrippinglever .......................................11 - 48
11.07.03 Radialposition ofthe trippinglever ...............................................................................11 - 49
11.07.04 Engagingsolenoid.........................................................................................................11 - 50
11.07.05 Cutterdrivelever ..........................................................................................................11 - 51
11.07.06 Controlcams forbobbinopener andcutter(using adjustmentgauge) ...........................11 - 52
11.07.07 Radial position of the control cam in relation to the bobbin opener................................11 - 53
11.07.08 Controlcamforcutter(adjustmentwithoutgauge) .......................................................11 - 54
11.07.09 Cuttercontrol leverforthe controlcam ofthecutter .....................................................11 - 55
11.07.10 Cutterreturnlever .........................................................................................................11 - 56
11.07.11 Cutterreturncontrol ......................................................................................................11 - 57
11.07.12 Fittingthecutter............................................................................................................11 - 58
11.07.13 Eccentricsleeve ...........................................................................................................11 - 59
11.07.14 Cutterdrivingrod ..........................................................................................................11 - 60
11.07.15 Cutterfunctiontest .......................................................................................................11 - 61
11.08 Tension release (only on machines with thread tension control -906/10) ...............11 -63
11.09 Adjustmentofbacktacking mechanism -911/.. .........................................................11 -64
11.09.01 Needle in needlehole (onlyfor PFAFF 471and 491) .....................................................11 - 64
11.09.02 Couplingforrollerpresserdrive ....................................................................................11 - 65
11.09.03 Bevel gears for feed wheel drive (on the PFAFF 471 and 474) ......................................11 - 66
11.09.04 Bevel gear play (on the PFAFF 471 and 474) ................................................................11 - 67
11.09.05 Bevel gears for feed wheel drive (on the PFAFF 491)....................................................11 - 68
11.09.06 Bevel gear play (on the PFAFF 491)..............................................................................11 - 69
11.10 ParametersettingsfortheQuick-MinistopMotor.....................................................11 -70

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!
Pointstobeobserved.
Dangerofinjuryforoperatingandspecialistpersonnel!
!
1.04 Important points for the user
●This Instruction Manual is a component part of the machine and must be available to the
operatingpersonnelat all times.
●TheInstruction Manualmustbe readbefore operatingthemachine forthe firsttime.
●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
ordeactivated.
●It is the obligation of the user to ensure that only authorized persons operate and work on
themachine.
FurtherinformationcanbeobtainedfromyourPFAFFagent.
I
Caution
Donot operatewithout fingerguardandsafetydevices.
Beforethreading,changingbobbinandneedle,cleaning
etc. switch off main switch.

Safety
1 - 3
1.05 Operating and specialist personnel
1.05.01 Operating personnel
Operatingpersonnelarepersonsresponsiblefortheequipping,operatingandcleaningofthe
machine as well as taking care of faults arising in the sewing area.
Theoperatingpersonnelisobliged toobserve thefollowingpoints andmust:
●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
aroundthemachine!
●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
adjustmentof themachine.
The specialist personnel is obliged to observe the following points and must:
●always observe the Notes on Safety in the Instruction Manual!
●switchoffthe On/Off switch before carryingoutadjustments or repairs and ensurethatit
cannotbe switchedonagainunintentionally!
●never work on parts which are still connected to the power supply! Exceptions are
containedonlyintheregulations EN50110.
●replace the protective coverings and close the electrical control box after all repairs or
maintenance work!

Safety
1 - 4
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 can become trapped or be slungaway!Danger of injury!
Switch the machine off before tilting it backwards!
Danger of injury if the machine is started accidentally!
Do not operate the machine without support 1! Danger due to top-heavy sewing
head! Machine can tip over backwards when tilted!
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!
24
Fig. 1 - 01
1
65
3

Proper use
2 - 1
2 Proper use
ThePFAFF471 is a single needle, high-speed post bed sewing machine (post to the left
ofthe needle)with drivenfeed wheeland rollerpresserandsynchronized
needle.
ThePFAFF474 is a two-needle, high-speed post bed sewing machine with driven feed
wheelandrollerpresser
ThePFAFF491 is a single needle, high-speed post bed sewing machine (post to the right
ofthe needle)with drivenfeed wheeland rollerpresserandsynchronized
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-
fiedbythemanufacturer!

Specifications
3 - 1
3 Specifications
3.01 PFAFF 471, 474 , 491 ▲
Stitchtype: .................................................................................................. 301 (lockstitch)
Balance wheel eff. diameter:.................................................................................... 65 mm
Fabric clearance (roller presser raised): ...................................................................... 7 mm
Clearancewidth: .................................................................................................... 245 mm
Clearanceheight:.................................................................................................... 115 mm
Postheight: ............................................................................................................ 180 mm
Dimensionsofsewing head:
Length: .......................................................................................................approx. 615 mm
Width:.........................................................................................................approx. 240 mm
Height(abovetable):...................................................................................approx. 450 mm
Sizeofbedplate: ............................................................................................518 x 177 mm
Max. speed:
Model A + B.........................................................................................2800 stichtes/min ◆
Model B/C ............................................................................................ 2500 stichtes/min ◆
Trimming margin (for -725/.. and -726/..): ....................................................... 0.8 - 2.5 mm
Trimming speed (for -725/.. and -726/..): ...................................................... 2800cuts/min
Connectiondata:
Operatingvoltage: ...........................................................................230 V ± 10%, 50/60 Hz
Max.powerconsumption:....................................................................................... 1.2 kVA
Fuseprotection:..............................................................................1 x 16 A, delayed action
Workingnoise level:
Emission at workplace
PFAFF 471 and 491 models A + B n = 2200 spm: ............................................... 80 dB(A)
PFAFF 471 and 491 models B/C n = 2000 spm:.................................................. 78 dB(A)
PFAFF 474 model B n = 2200 spm: ..................................................................... 81 dB(A)
PFAFF 474 model B/C n = 2000 spm: .................................................................. 79 dB(A)
( Noise measurement in accordance with DIN 45 635-48-A-1 )
Netweightofsewinghead: ............................................................................ approx. 53 kg
Grossweight ofsewing head: ........................................................................ approx. 61 kg
▲Subject to alteration
◆Dependent on material, working cycle and stitch length

Specifications
3 - 2
3.02 Needles and threads
Threadstrength▲
(Nm) max.
synthetic
Model
B 40/3 100 134 134 - 35
B/C 20/3 120 134 134 - 35
A 60/3 70 134 -
Needlesize
in
1/100 mm
Needlesystem
for
PFAFF471
and491
▲ or similar strengths of other types of thread
3.03 Possible models and subclasses
ModelA.............................................................................Forsewinglightweightmaterials
ModelB..................................................................... Forsewingmedium-weightmaterials
ModelB/C ............................................... For sewing medium- to medium-heavy materials
Additionalequipment:
Subclass -725/04 ............................................................................................ Edgetrimmer
Subclass -726/05 ............................................................................................ Edgetrimmer
Subclass -900/53 ......................................................................................... Threadtrimmer
Subclass -906/10 ........................................................................................Threadtensioner
Subclass -910/15 ...................................................................... Automaticpresserfootlifter
Subclass -911/35 .................................................................................................. Bartacker
Needlesystem
forthe
PFAFF474

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
7 Controls
7.01 On/offswitchonmachines withmini-stop motor
withoutedge trimmer-725/..or -726/..
●The machine is switched on or off by
pressing the on/off switch 1.
●Theilluminateddiode 2controlsthe
machineoperation
Switch 1 on:
Diodeon = Machinereadyfor
operation
Diodeflashes = Fault
Switch 1 off:
Diodeflashes = Machine still
underelectric
currentforabout
4 sec.
Diodeout = Machineoff
●The machine speed can be adjusted on
potentiometer3.
7.02 On/offswitchonmachines withmini-stop motor
and edge trimmer -725/.. oder -726/..
●The machine is switched on or off by
turningtheon/offswitch1.
●Theilluminateddiode 2controlsthe
machineoperation
Switch 3 on:
Diodeon = Machinereadyfor
operation
Diodeflashes = Fault
Switch 3 off:
Diodeflashes = Machine still
underelectric
currentforabout
4 sec.
Diodeout = Machineoff
●The machine speed can be adjusted on
potentiometer4.
Fig. 7 - 02
1
Fig. 7 - 01
1
2
3
3
2
4

Controls
7 - 2
7.04 Pedal
0= Neutralposition
1= Sewing
2= Raise roller presser (on
machines with -910/..)
3= Trimsewingthreads (on
machines with -900/..)
Fig. 7 - 04
0
1
23
7.03 Button on machine head (only on machines with -911/..)
●Ifbutton 1isoperated duringsewing, the
machine switches to reverse sewing.
Fig. 7 - 03
1

Controls
7 - 3
7.05 Leverfor liftingroller 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
pressingtheknee lever 1inthedirection
ofthearrow.
1
Fig. 7 - 06

Controls
7 - 4
7.07 Key for setting stitch length
Fig. 7 - 07
●The stitch length is set by pressing key 1
andturningthe balance wheel (see
Chapter9.08Setting the stitchlength).
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 471
Keep your hands away from the
movingknife!Dangerofinjury!
Switch on knife drive:
●Move lever 1backwards. The knife
movesintooperatingposition.
Switch off knife drive:
●Press lever 1. The knife swings
backwards.
Switch on edge guide:
●Swing edge guide 2intoposition by hand
and press lever 3. The edge guide 2
movesinto itsoperatingposition.
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
havebeenproperlyinstructed.
●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.
Fig. 7 - 09
3
2 4
1
6
5