Pfaff 1245 User manual

Instruction manual
296-12-18401/002
Betriebsanleitung engl. 10.00
1245
1246
This instruction manual applies to machines from the
following serial numbers onwards:
PFAFF 1245 # 527 678
PFAFF 1246 # 527 679

This Instruction manual is valid for all models and subclasses listed in the
chapter „Specifications“.
The reprinting, copying or translation of PFAFF Instruction Manuals, whether in whole or in
part, is only permitted with our previous permission and with written reference to the
source.
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 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 1245 ................................................................................................................. 3 - 1
3.02 Possible models and subclasses ................................................................................. 3 - 1
3.03 Max. number of stitches/min-1 ...................................................................................................................................................... 3 - 2
3.04 PFAFF 1246 ................................................................................................................. 3 - 3
3.05 Possible models and subclasses ................................................................................. 3 - 3
3.06 Max. number of stitches/min-1 ...................................................................................................................................................... 3 - 4
4Disposal of the machine ........................................................................................... 4 - 1
5Transport, packaging and storage ........................................................................... 5 - 1
5.01 Transport to the customer ........................................................................................... 5 - 1
5.02 Transport within the customer’s premises .................................................................. 5 - 1
5.03 Disposal of the packaging ............................................................................................ 5 - 1
5.04 Storage ........................................................................................................................ 5 - 1
6Explanation of the symbols ...................................................................................... 6 - 1
7Controls ...................................................................................................................... 7 - 1
7.01 On/off switch ............................................................................................................... 7 - 1
7.02 Pedals (on machines with subclass -910/01) ............................................................... 7 - 1
7.03 Pedal (on machines with automatic presser-foot lifter (subclass -910/98)................... 7 - 1
7.04 Key on the machine head (for machines with backtacking mechanism -911/97)......... 7 - 2
7.05 Lever for lifting the presser foot .................................................................................. 7 - 2
7.06 Feed regulator / reverse sewing .................................................................................. 7 - 3
7.07 Feed regulator on machines with backtacking mechanism -911/97 ............................ 7 - 3
7.08 Adjustment nut for the top-feed stroke ....................................................................... 7 - 4

Index
Contents ......................................................................................................Chapter - Page
8Mounting and commissioning the machine........................................................... 8 - 1
8.01 Mounting .....................................................................................................................8-1
8.01.01 Adjusting the table-top height ...................................................................................... 8 - 1
8.01.02 Adjusting the V-belt tension ......................................................................................... 8 - 2
8.01.03 Mounting the upper V-belt guard ................................................................................. 8 - 2
8.01.04 Mounting the lower V-belt guard ................................................................................. 8 - 3
8.01.05 Mounting tilt-over safeguard........................................................................................ 8 - 3
8.01.06 Mounting the spool holder ........................................................................................... 8 - 4
8.01.07 Mounting the sewing lamp .......................................................................................... 8 - 4
8.02 Commissioning the machine........................................................................................ 8 - 5
8.03 Switching the machine on/off ...................................................................................... 8 - 5
9Preparation ................................................................................................................. 9 - 1
9.01 Inserting the needle in the PFAFF 1245....................................................................... 9 - 1
9.02 Inserting the needle in the PFAFF 1246....................................................................... 9 - 2
9.03 Winding the bobbin thread, adjusting the thread tension............................................. 9 - 2
9.04 Removing/Threading the bobbin case .......................................................................... 9 - 3
9.05 Inserting the bobbin case / Adjusting the bobbin thread tension ................................. 9 - 3
9.06 Threading the needle thread /
Adjusting the needle thread tension in the PFAFF 1245 .............................................. 9 - 5
9.07 Threading the needle thread /
Adjusting the needle thread tension in the PFAFF 1246 .............................................. 9 - 6
10 Care and maintenance ............................................................................................ 10 - 1
10.01 Servicing and maintenance intervals.......................................................................... 10 - 1
10.02 Cleaning ..................................................................................................................... 10 - 1
10.03 General lubrication ..................................................................................................... 10 - 2
10.04 Lubricating the hook .................................................................................................. 10 - 3
10.05 Lubricating the head .................................................................................................. 10 - 4
10.06 Lubricating the top-feed drive excentric..................................................................... 10 - 4
10.07 Checking the air pressure .......................................................................................... 10 - 5
10.08 Emptying / Cleaning the water container of the air filter............................................ 10 - 5
11 Adjustment............................................................................................................... 11 - 1
11.01 Tools, gauges and other accessories for adjusting .................................................... 11 - 1
11.02 Notes on adjusting ..................................................................................................... 11 - 1
11.03 Abbreviations ............................................................................................................. 11 - 1
11.04 Adjusting the basic machine .................................................................................. 11 - 2
11.04.01 Positioning the feed dog across the direction of sewing ........................................... 11 - 2

Index
Contents ......................................................................................................Chapter - Page
11.04.02 Positioning the feed dog in the direction of sewing ................................................... 11 - 3
11.04.03 Height of the bottom feed-dog .................................................................................. 11 - 4
11.04.04 Pre-adjusting the needle height ................................................................................. 11 - 5
11.04.05 Centering the needle in the needle hole .................................................................... 11 - 6
11.04.06 Lifting motion of the bottom feed-dog ....................................................................... 11 - 7
11.04.07 Driving motion of the bottom and top feeds.............................................................. 11 - 8
11.04.08 Hook-to-needle clearance, needle rise, needle height and needle guard ................... 11 - 9
11.04.09 Top-feed stroke.......................................................................................................... 11-11
11.04.10 Lifting motion of the top feed .................................................................................... 11-12
11.04.11 Bobbin-case opener ................................................................................................... 11-13
11.04.12 Safety clutch .............................................................................................................. 11-14
11.04.13 Needle thread tension release ................................................................................... 11-15
11.04.14 Thread check spring................................................................................................... 11-16
11.04.15 Thread check spring on PFAFF 1246 with thread trimmer -900/56............................ 11-17
11.04.16 Bobbin winder............................................................................................................ 11-18
11.04.17 Presser-foot pressure ................................................................................................ 11-19
11.05 Adjusting the thread trimmer -900/56 ........................................................................ 11-20
11.05.01 Pre-adjusting the control cam .................................................................................... 11-20
11.05.02 Tripping lever ............................................................................................................. 11-21
11.05.03 Pawl ........................................................................................................................... 11-22
11.05.04 Engaging solenoid ...................................................................................................... 11-23
11.05.05 Release trip ................................................................................................................ 11-24
11.05.06 Engaging lever ........................................................................................................... 11-25
11.05.07 Linkage rod ................................................................................................................ 11-26
11.05.08 Final adjustment of the control cam........................................................................... 11-27
11.05.09 Catch.......................................................................................................................... 11-28
11.05.10 Connecting rod (for PFAFF 1246 only) ....................................................................... 11-29
11.05.11 Thread-catcher height ................................................................................................ 11-30
11.05.12 Knife........................................................................................................................... 11-31
11.05.13 Thread catcher reverse position................................................................................. 11-32
11.05.14 Bobbin-thread clamp spring ....................................................................................... 11-34
11.05.15 Tension release bar.................................................................................................... 11-36
11.05.16 Positioner ................................................................................................................... 11-38
12 Wearing parts........................................................................................................... 12 - 1

Safety
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 -including those of the country and all valid environ-
mental 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
having completely read and understood the Instruction Manual!
●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, presser foot, needle plate, feed dog 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!
●When servicing or carrying out repairs on pneumatic devices, the machine is to be
removed from the compressed air supply! The only exceptions to this are adjustments
and function checks carried out by 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.
1 - 1

Safety
1.03 Safety symbols
Danger!
Points to be observed.
Danger of injury for operating and specialist personnel!
1 - 2
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 operator to only operate the machine in perfect running order.
●It is the obligation of the operator to ensure that none of the safety mechanisms are
removed or deactivated.
●It is the obligation of the operator to ensure that only authorized persons operate and
work on the machine.
Further information can be obtained at 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
1.05 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 operate the machine.
●always immediately report to the user 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.
●when servicing or carrying out repairs on pneumatic devices, remove the machine from
the compressed air supply! The only exceptions to this are function checks.
●replace the protective coverings and close the electrical control box after all repairs or
maintenance work!
1 - 3

Safety
1 - 4
1.06 Danger
A working area of 1 metre 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 or in the needle plate area while adjusting the
machine settings! Objects can become trapped or be slung away! Danger of
injury!
On mechanically activated clutch motors without an actuating lock, wait until
the motor has come to a standstill! Danger of injury!
Do not operate the machine without the take-up lever guard 1!
Danger of injury due to the movement of the take-up lever!
Do not operate the machine without the finger guard 2!
Danger of injury by the moving needle!
Fig. 1 - 01
1
2

Safety
Do not operate the machine
without belt guards 4and 5!
Danger of injury by the revolving
V-belt!
1 - 5
Fig.1 - 02
Fig. 1 - 03
4
5
3
Do not operate the machine
without tilt-back safeguard 3!
Danger of crushing between
upper part and table top!

2 - 1
Proper use
2 Proper use
PFAFF 1245
The PFAFF 1245 is a single needle, flatbed sewing machine with bottom, top and needle
feeds as well as a large vertical hook for sewing lockstitch seams.The machine is designed
for commercial use (industry).
PFAFF 1246
The Pfaff 1246 is a two-needle, flat bed sewing machine with bottom, top and needle feed
as well as vertical sewing hook for lockstitch seams.The machine is intended for commercial
(industrial) use only.
Any and all uses of this machine which have not been approved of by the
manufacturer are considered to be inappropriate! The manufacturer cannot be
held liable for any damage caused by the inappropriate use of the machine!
The appropriate use of the machine includes the observance of all operational,
adjustment, maintenance and repair measures required by the manufacturer!

3 - 1
Specifications
3.02 Possible models and subclasses
Model C: ................................................................... For processing medium-heavy materials
Additional equipment:
Subclass -900/56..............................................................................................Thread trimmer
Subclass -910/...............................................................................Automatic presser-foot lifter
Subclass -911/ ............................................................................................................Bartacker
◆Subject to alteration
▲Or comparable thicknesses of other thread types
3 Specifications ◆
3.01 PFAFF 1245
Stitch type:........................................................................................................ 301 (lockstitch)
Needle system:..............................................................................................................134-35
Needle thickness in 1/100 mm:
Model C: .....................................................................................................................110 - 140
Max. thread thickness (synthetic ▲):
Model C: ........................................................................................................................... 20/3
Max. stitch length:
Model N: ...................................................................................................................... 6.0 mm
Model N8: .................................................................................................................... 8.0 mm
Handwheel eff. dia.: ...................................................................................................... 80 mm
Max. speed: ................................................................................................... see chapter 3.03
Dimensions of machine:
Length:........................................................................................................... approx. 570 mm
Width: .............................................................................................................approx. 177 mm
Height: ............................................................................................................approx. 410 mm
Clearance width: ......................................................................................................... 265 mm
Clearance height: .........................................................................................................115 mm
Fabric clearance (presser foot raised): .......................................................................... 14 mm
Net weight (machine head): ................................................................................ approx. 40 kg
Power supply:.......................................................................... 190 - 240V 50 / 60 Hz, 1 phase
Power consumption: .............................................................................................max. 600VA
Fuse protection: .................................................................................. 1 x 16 A, delayed action
Working air pressure: ....................................................................................................... 6 bar
Air consumption:......................................................................................... ~0.8 l / work cycle
Working noise level:
Emission at workplace
n = 2300 spm: ...........................................................................................................82 dB (A)
Noise measurement in accordance with DIN 45 635-48-A-1

3 - 2
Specifications
3.03 Max. number of stitches/min-1
Max. number of
stitches/min-1 for
stitch lengths up to 6 mm
Top feed lift Max. number of
stitches/min-1 for stitch
lengths from 6 mm to 8 mm
less than 3.5 mm
from 3.5 to 5.5 mm
from 5.5 to 7 mm
2800
2500
2000
2600
2500
2000

3 - 3
Specifications
3.04 PFAFF 1246◆
Stitch type:........................................................................................................ 301 (lockstitch)
Needle system:..............................................................................................................134-35
Needle thickness in 1/100 mm:
Model B: ......................................................................................................................80 - 100
Model C: .....................................................................................................................110 - 140
Max. thread thickness (synthetic ▲):
Model B: ........................................................................................................................... 40/3
Model C: ........................................................................................................................... 20/3
Max. stitch length:
Model BN and CN: ....................................................................................................... 6.0 mm
Model CN8:.................................................................................................................. 8.0 mm
Handwheel eff. dia.: ...................................................................................................... 80 mm
Max. speed: ................................................................................................... see chapter 3.06
Dimensions of machine:
Length:........................................................................................................... approx. 570 mm
Width: .............................................................................................................approx. 177 mm
Height: ............................................................................................................approx. 410 mm
Clearance width: ......................................................................................................... 265 mm
Clearance height: .........................................................................................................115 mm
Fabric clearance (presser foot raised): .......................................................................... 14 mm
Net weight (machine head): ................................................................................ approx. 40 kg
Power supply:.......................................................................... 190 - 240V 50 / 60 Hz, 1 phase
Power consumption: .............................................................................................max. 600VA
Fuse protection: .................................................................................. 1 x 16 A, delayed action
Working air pressure: ....................................................................................................... 6 bar
Air consumption:......................................................................................... ~0.8 l / work cycle
Working noise level:
Emission at workplace
n = 2200 spm: ...........................................................................................................82 dB (A)
Noise measurement in accordance with DIN 45 635-48-A-1
◆Subject to alteration
▲Or comparable thicknesses of other thread types
3.05 Possible models and subclasses
Model B: ..............................................................................For processing medium materials
Model C: ................................................................... For processing medium-heavy materials
Additional equipment:
Subclass -900/56..............................................................................................Thread trimmer
Subclass -910/04 ...........................................................................Automatic presser-foot lifter
Subclass -911/35 ........................................................................................................Bartacker

3 - 4
Specifications
3.06 Max. number of stitches/min-1
less than 3.5 mm
from 3.5 to 5.5 mm
from 5.5 to 7 mm
2700 2500
2400 2200
1900 1700
Max. number of stitches/min-1 for
stitch lengths up to 6 mm and needle gauge of up to 10 mm Max. number of stitches/min-1 for stitch lengths up to 6 mm and needle gauge of more than 10 mm Max. number of stitches/min-1 for stitch lengths from 6 mm to 8 mm and needle gauge of up to 10 mm Max. number of stitches/min-1 for stitch lengths up to 6 mm to 8 mm and needle gauge of more than 10 mm
2500 2300
2400 2100
1900 1600
Top feed lift

Disposal of the machine
4 - 1
4 Disposal of machine waste
●The proper disposal of machine waste is the responsibility of the customer.
●The materials used on the machines are steel, aluminium, brass and various plastics.
The electrical equipment consists of plastics and copper.
●The machine waste is to be disposed of in accordance with the locally valid
environmental protection regulations. If necessary a specialist is to be commissioned.
Special care is to be taken that parts soiled with lubricants are separately
disposed of in accordance with the locally valid pollution control regulations!

Transport packaging and storage
5 - 1
5 Transport packaging and storage
5.01 Transport to the customer’s premises
Within the Federal Republic of Germany, the machine is delivered without packaging.
Machines for export are packaged in a crate or wrapped depending on how they are
transported.
5.02 Transport within the customer’s premises
The manufacturer carries no liability for transport within the customer’s premises. Care is
to be taken to transport the machine in an upright position only.
5.03 Disposal of the packaging
The packaging of the machine consists of wood, paper, cardboard and VCE fibre. The proper
disposal of the packaging is the responsibility of the customer.
5.04 Storage
The machine can be stored for up to 6 months if not in use. During this time it should be
protected from dust and moisture.
For longer storage the individual parts of the machine, especially the moving parts, should
be protected against corrosion e.g. by a film of oil.
5 - 1

Explanation of the symbols
6 - 1
6 Explanation of the symbols
In the following section of this Instruction Manual, certain tasks or important pieces of
information are accentuated by symbols.
The symbols used have the following meanings:
Note, information
Cleaning, care
Lubrication, greasing
Servicing, repairing, adjustment, maintenance
(only to be carried out by specialist personnel)

7 - 1
Controls
●Turn the machine on and off by switching
the on/off switch 1on and off.When the
machine is on, the light in the switch is
also on.
The switch in the illustration can
be found on machines with Quick
motors. When other motors are
used, the switch may not look
the same.
7.02 Pedals (on machines with subclas -910/01)
Fig. 7 - 01
Fig. 7 - 02
With the on/off switch on
0= Machine stop
+1 = Sew
- 1 = Trim thread (on machines with thread
trimmer)
+2 = Raise presserfoot
0
+1
+2
- 1
7 Controls
7.01 On/off switch
1

7 - 2
Controls
7.04 Key on the machine head (for machines with backtacking mechanism -911/97)
Fig. 7 - 03
0
- 1 - 2
+1
With the on/off switch on
0= Machine stop
+1 = Sew
- 1 = Raise presserfoot
- 2 = Trim thread (on machines with thread
trimmer)
7.03 Pedal (on machines with automatic presser-foot lifter -910/98)
●Switch to reverse sewing by pressing
key 1while sewing.
Fig. 7 - 04
1