Pfaff 1243-712/02 User manual

INSTRUCTION MANUAL
296-12-18 354/002
Betriebsanleitung engl. 06.09
This instruction manual applies to machines from the
following serial numbers onwards:
# 2 565 145
1243-712/02
Industrial
®

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 GmbH
Postfach 3020
D-67653 Kaiserslautern
Königstr. 154
D-67655 Kaiserslautern
Editing/illustrations
PFAFF
Dept. TES

Contents
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 notes for the user ...................................................................................... 1 - 2
1.05 Operating and technical staff ..................................................................................... 1 - 3
1.05.01 Operating staff ...........................................................................................................1- 3
1.05.02 Technical staff............................................................................................................ 1 - 3
1.06 Danger warnings........................................................................................................ 1 - 4
2Proper use ................................................................................................................ 2 - 1
3Specifications ........................................................................................................... 3 - 1
3.01 PFAFF 1243-712/02 ................................................................................................... 3 - 1
3.02 Models and subclasses.............................................................................................. 3 - 1
4Machine disposal ..................................................................................................... 4 - 1
5Transportation, packing and storage ...................................................................... 5 - 1
5.01 Transportation to customer’s premises ..................................................................... 5 - 1
5.02 Transportation inside 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 Pedal .......................................................................................................................... 7 - 1
7.03 Top feed stroke adjustment ....................................................................................... 7 - 2
8Installation and commissioning .............................................................................. 8 - 1
8.01 Installation.................................................................................................................. 8 - 1
8.01.01 Adjusting the table height .......................................................................................... 8 - 1
8.01.02 Tensioning the v-belt.................................................................................................. 8 - 2
8.01.03 Fitting the upper V-belt guard .................................................................................... 8 - 2
8.01.04 Fitting the lower belt guard ........................................................................................ 8 - 3
8.01.05 Fitting tilt lock ............................................................................................................ 8 - 3
8.01.06 Fitting the synchronizer.............................................................................................. 8 - 4
8.01.07 Assembling the reel stand .......................................................................................... 8 - 4
8.01.08 Mountingthethread retainers ..................................................................................... 8 - 5
8.02 Initialoperation ........................................................................................................... 8- 5
8.03 Switching the machine on / off ................................................................................... 8 - 5
9Setting up ................................................................................................................. 9 - 1
9.01 Inserting the needle ................................................................................................... 9 - 1
9.02 Winding the bobbin thread, adjusting the thread tension .......................................... 9 - 2

Contents
Contents ...............................................................................Chapter - Page
9.03 Removing /inserting the bobbin case .......................................................................... 9 - 3
9.04 Threading the bobbin case / adjusting the thread tension ............................................ 9 - 3
9.05 Threadingneedlethread/adjustingneedle threadtension ............................................ 9 - 4
10 Care and maintenance ........................................................................................... 10 - 1
10.01 Servicing and maintenance intervals ........................................................................ 10 - 1
10.02 Cleaning the hook compartment and the hook ........................................................ 10 - 1
10.03 General lubrication ................................................................................................... 10 - 2
10.04 Lubricating the hook ................................................................................................ 10 - 3
10.05 Lubricating the needle head parts ............................................................................ 10 - 3
11 Adjustment ............................................................................................................. 11 - 1
11.01 Notes on adjusting ................................................................................................... 11 - 1
11.02 Tools, gauges and other accessories ....................................................................... 11 - 1
11.03 Abbreviations ........................................................................................................... 11 - 1
11.04 Adjustment of the basic machine ............................................................................ 11 - 2
11.04.01 Needle position in needle hole ................................................................................. 11 - 2
11.04.02 Needle height (preliminary adjustment) ................................................................... 11 - 3
11.04.03 Hook-to-needle clearance, needle rise, needle height and needle guard ................. 11 - 4
11.04.04 Bobbin opener.......................................................................................................... 11 -6
11.04.05 Safety coupling ........................................................................................................ 11 -7
11.04.06 Top feed lifting motion ............................................................................................. 11 - 8
11.04.07 Presser foot lift ........................................................................................................ 11 - 9
11.04.08 Needle-thread tension release ................................................................................. 11 - 10
11.04.09 Pressure of the lifting presser.................................................................................. 11 - 11
11.04.10 Thread check spring ................................................................................................. 11 - 12
11.04.11 Bobbin winder .......................................................................................................... 11 -13
11.05 Adjusting the thread trimmer -900/56 .................................................................. 11 - 14
11.05.01 Pre-adjusting the control cam .................................................................................. 11 - 14
11.05.02 Tripping lever ........................................................................................................... 11 - 15
11.05.03 Pawl ......................................................................................................................... 11 - 16
11.05.04 Engaging solenoid .................................................................................................... 11 - 17
11.05.05 Release trip ..............................................................................................................11-18
11.05.06 Engaging lever ......................................................................................................... 11 -19
11.05.07 Linkage rod .............................................................................................................. 11 - 20
11.05.08 Final adjustment of the control cam......................................................................... 11 - 21
11.05.09 Catch ........................................................................................................................ 11 - 22
11.05.10 Thread-catcher height .............................................................................................. 11 - 23
11.05.11 Knife......................................................................................................................... 11 - 24
11.05.12 Thread catcher reverse position............................................................................... 11 - 25
11.05.13 Bobbin-thread clamp spring ..................................................................................... 11 - 26
11.05.14 Adjusting the synchronizer ....................................................................................... 11 - 28

Safety
1 - 1
1 Safety
1.01 Regulations
This machine has been made according to the European regulations indicated in the
conformity and manufacturer’s declarations.
In addition to this instruction manual, please also observe all generally accepted statutory
and other legal requirements, including those of the user’s country, and the valid pollution
control regulations!
The locally valid regulations of the social insurance institution responsible for occupational
accidents, or other supervisory authorities, must be strictly adhered to!
1.02 General notes on safety
●The machine must only be operated when the instruction manual has been fully read and
understood, and only by operators who have had the necessary training!
●All notes on safety and the instruction manual of the motor manufacturer must be read
before the machine is put into operation!
●All notices on the machine referring to danger and safety must be observed!
●The machine must be used for the purpose it is intended for and must not be operated
without its safety devices; all regulations relevant to safety must be adhered to.
●When part sets are changed (e.g. needle, presser foot and needle plate), during
threading, when the workplace is left unattended and during maintenance work, the
machine must be isolated from the power supply by pressing the on/off switch or
removing the plug from the mains!
●Daily maintenance work must only be carried out by appropriately trained persons!
●Repairs and special maintenance work must only be carried out by qualified technical
staff or persons with the appropriate training! Exceptions to this are only allowed for
adjustment and function checks by appropriately trained personnel!
●Repair work and special maintenance work must only be carried out by technical
personnel or by persons with the appropriate training!
●Work on the electrical equipment must only be carried out by technical staff who are
qualified to do so!
●Work on parts or equipment connected to the power supply is not permitted! The only
exceptions to this are specified in regulations EN 50110.
●Conversion or modification of the machine must only be carried out under observation of
all relevant safety regulations!

1 - 2
Safety
●Only spare parts which have been approved by us are to be used for repairs! We draw
special attention to the fact that spare parts and accessories not supplied by us have not
been subjected to testing nor approval by us. Fitting and/or use of any such parts may
cause negative changes to the design properties of the machine. We shall not accept
any liability for damage caused by the use of non-original parts.
1.03 Safety symbols
Danger!
Special points to observe.
Danger of injury to operating or technical staff!
I
Caution
Do not operate without finger guard and safety devices.
Before threading, changing bobbin and needle, cleaning
etc. switch off main switch.
1.04 Important notes for the user
●This instruction manual is part of the equipment of the machine and must be available to
the operating staff at all times.
●The instruction manual must be read before the machine is operated for the first time.
●Both operating and technical staff must be instructed on the safety devices of the machine
and on safe working methods.
●It is the duty of the user to operate the machine in perfect running order only.
●The user must ensure that none of the safety devices are removed nor put out of working
order.
●The user must ensure that only authorized persons operate and work on the machine.
For further information please refer to your PFAFF agency.

Safety
1 - 3
1.05 Notes for operating and technical staff
1.05.01 Operating staff
Operating staff are the persons responsible for setting up, operating and cleaning the
machine and for removing any disturbances in the sewing area.
The operating staff must be sure to observe the following items:
●always observe the notes on safety in this instruction manual in their work!
●refrain from any working methods which adversely effect the safety of the machine!
●avoid wearing loose clothing or jewelry such as necklaces or rings!
●also make sure that only authorised persons are allowed near the danger area of the
machine
●immediately report to the user any changes to the machine that may affect its safety!
1.05.02 Technical staff
Technical staff are persons who have been trained in electrical engineering, electronics,
pneumatics and mechanical engineering. They are responsible for lubricating, servicing,
repairing and adjusting the machine.
The technical staff must be sure to observe the following items:
●always observe the notes on safety in this instruction manual in their work!
●press the on/off switch before carrying out adjustment and repair work, and ensure it
cannot be switched on again unintentionally, or isolate the machine from the power
supply by removing the mains plug!
●never work on parts or equipment still connected to the power supply! Exceptions to this
are only permissible according to regulations EN 50110;
●replace all safety covers after carrying out maintenance or repair work and, if applicable,
close the electrical control box again!

1 - 4
Safety
1.06 Danger warnings
A working area of 1 m must be kept free both in front of and behind the
machine, so that easy access is possible at all times.
Never put your hands or fingers in the sewing area during sewing!
Danger of injury by the needle!
While setting or adjusting the machine do not leave any objects on the table
nor in the needle plate area! Objects may be trapped or flung out of the
machine!
When a mechanically operated clutch motor without actuation lock is
switched off, always wait until the motor has stopped! Danger of injury!
Do not operate the machine without take-up lever guard 1!
Danger of injury by the movement of the take-up lever!
Do not operate the machine without belt guard 2and 3!
Danger of injury from running drive belts!
Do not operate the machine without finger guard 4!
Danger of injury from the up- and downward movement of the needle!
Do not operate the machine without tilt lock 5!
Danger of crushing between sewing head and table top!
Fig. 1 - 01
12
4
3
5

Proper use
2 - 1
2 Proper use
The PFAFFPFAFF
PFAFFPFAFF
PFAFF 1243-712/02 is a single-needle, lockstitch, flatbed sewing machine for industrial
stitching work.
Any use of this machine which is not approved by the manufacturer shall be
considered as improper use! The manufacturer shall not be held liable for any
damage arising out of improper use! Proper use shall also be considered to
include compliance with the operation, adjustment, service and repair
measures specified by the manufacturer!

Technische Daten
3 - 1
3 Specifications
3.01 PFAFF 1243-712/02◆
Stitch type:.................................................................................................. 301 (lockstitch)
Model:............................................................................................................................... B
Needle system: ............................................................................................................. 190
Needle size in 1/100 mm: ......................................................................................80 – 100
Max. thread size (synthetic▲): ...................................................................................... 40/3
Max. speed::
PFAFF 1243-712/02 ......................................................................................... 1000 s.p.m.
Handwheel eff. dia. .................................................................................................. 90 mm
Machine dimensions
Length:...................................................................................................... approx. 530 mm
Width: ....................................................................................................... approx. 177 mm
Height (above table): ................................................................................. approx. 265 mm
Clearance width: .................................................................................................... 270 mm
Clearance height: ................................................................................................... 115 mm
Fabric clearance:
PFAFF 1243-712/02 ........................................................................................ max. 20 mm
Net weight (sewing head): ..........................................................................................42 kg
Power supply: ............................................................................ See motor service manual
Power consumption: .................................................................. See motor service manual
Fuse protection: ......................................................................... See motor service manual
Working noise level:
Emission level at workplace
PFAFF 1243-712/02, at a speed of 800 spm.: ........................................................78 dB(A)
Noise measurement in accordance with DIN 45 635-48-A-1
◆Subject to alteration
▲ or comparable thicknesses of other thread types
3.02 Models and subclasses
Model B: .................................................................. for work on medium-weight materials
Accessories:
Subclass –900/56 ........................................................................... Thread trimming device

Disposal of the machine
4 - 1
4 Disposal of the machine
●The proper disposal of the machine is the responsibility of the user.
●The materials used for the machine are steel, aluminium, brass and various plastics. The
electrical equipment consists of plastics and copper.
●The machine must be disposed of in accordance with applicable local pollution control
regulations. If necessary, a specialist is to be consulted.
Special care is to be taken that parts soiled by lubricants are separately
disposed of in accordance with the applicable local environmental 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 exports 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.
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 the symbols
6 - 1
6 Explanation of the symbols
In this Instruction Manual, work to be carried out and important information are drawn to
your attention by symbols. The symbols have the following meanings:
Note, information
Cleaning, care
Lubrication
Servicing, repairing, adjustment, maintenance
(only to be carried out by specialist personnel)

Controls
7 - 1
Fig. 7 - 01
7 Controls
7.01 On/off switch
●Switch the machine on or off by turning
on/off switch 1.
The illustrated on/off switch is
fitted to machines with Quick
motors. If other motors are
used, a different switch may
be fitted.
O
1
7.02 Pedal (on versions with one pedal)
0= Neutral position
1= Sewing
2= Thread trimming (on machines with
thread trimmer –900/56) and presser
foot lifting.
For further pedal functions
please refer to the instruction
manual of the motor
manufacturer.
Fig. 7 - 02
0
1
2

Controls
7 - 2
1
3
2
+
-
7.03 Top feed stroke adjustment
Switch off the machine!
Danger of injury due to
unintentional starting of the
machine!
●The top feed stroke is adjusted by re-
positioning lever 1. To do this, remove
cover 2 at the rear side of the machine
and loosen screw 3.
●After adjustment, tighten screw 3and
close cover 2.
Fig. 7 - 03

8 - 1
Installation and commissioning
8 Installation and commissioning
The machine must only be installed and commissioned by qualified personnel!
All relevant safety regulations must be strictly adhered to!
If the machine is delivered without a table, be sure to use a stand and table that
will reliably support the weight of the machine with its motor.
It is very important to ensure that the stand of the machine is firm and steady,
also during sewing.
8.01 Installation
The site where the machine is installed must be provided with suitable connections for
electric current and compressed air. It must be ensured that the standing surface of the
machine site is firm and horizontal and that sufficient lighting is available.
For packing and transportation reasons the table top is in the lowered position.
The table height is adjuted as described below.
8.01.01 Adjusting the table height
54-009
Fig. 8 - 01
1
1
2
●Loosen screws 1and 2and set the table at the required height.
●Fully tighten screw 1.
●Set the required pedal position and tighten tighten screw 2.

8 - 2
Installation and commissioning
8.01.03 Fitting the upper V-belt guard
Break out corner 1of belt guard
section 3.
●Screw position stop 2onto belt guard
section 3.
●Screw on belt guard section 3.
●Screw on belt guard section 4.
8.01.02 Tensioning the v-belt
●Loosen nuts 1.
●Tension v-belt by adjusting bracket 2..
..
.
●Tighten nuts 1.
Fig. 8-02 shows a Quick motor.
If a different motor is used,
please refer to the instruction
manual of the motor
manufacturer.
Fig. 8 - 02
Fig. 8 - 03
1
2
2 cm
2
4
3
1

8 - 3
Installation and commissioning
8.01.04 Fitting the lower belt guard
●Position belt guard 1so that motor pulley
and v-belt can run freely.
Fig. 8-04 shows a Quick motor.
If a different motor is used,
please refer to the instruction
manual of the motor
manufacturer.
Fig. 8 - 04
Fig. 8 - 05
1
8.01.05 Fitting tilt lock
●Attach tilt lock 1included in the
accessories with screw 2.
Do not operate the machine
without tilt-over safeguard 1!
Danger of crushing between
upper part and the table top!
1
2

8 - 4
Installation and commissioning
8.01.07 Assembling the reel stand
●Assemble the reel stand as shown in Fig.
8-07.
●Afterwards insert the stand in the hole in
the table top and secure it with the nuts
provided.
Fig. 8 - 07
Fig. 8 - 06
8.01.06 Fitting the synchronizer
●Slide synchronizer 1onto the shaft.
●Slightly tighten screws 2.
●Insert plug of the synchronizer into the
control box.
●Adjust synchronizer (see Chapter
11.05.14 Adjusting the synchronizer).
2
1

8 - 5
Installation and commissioning
8.02 Initial operation
●Check the machine, in particular the
electrical leads and pneumatic
connection tubes, for any damage.
●Remove pin 1from the oil reservoir 2.
The pin 1serves only to protect the
machine from damage during
transportation and must not be used
during sewing.
●Clean the machine thoroughly and oil it,
or top up the oil, see Chapter 10 Care
and Maintenance.
●Have mechanics ensure that the
machine’s motor can be operated with
the available electricity supply and that it
is connected correctly to the terminal
box. If not, the machine must not be
operated.
●The balance wheel must rotate towards the operator when the machine is running. If not,
have the motor connection changed by a mechanic.
8.03 Switching the machine on / off
●Switch the machine on or off, see Chapter 7.01 On/off switch.
●Carry out a test run.
Fig. 8 - 09
1
2
8.01.08 Mounting the thread retainers
●Screw the thread retainers 1and 2into
the tapped holes on the top side of the
machine and fix them with nuts 3and 4.
When mounting the thread
retainers care must be taken to
see that the thread retainer with
the weak spring (recognizable
from the engraving 91-141 873-91
on the top side) is mounted in
position ➊.
Fig. 8 - 08
4
1
3
2
➊