Pfaff 939 User manual

Instruction Manual
296-12-18 603/002
Betriebsanleitung engl. 01.05
This instruction manual applies to machines from the
following serial numbers onwards:
# 2660862
-2/02
-2/03
939 U
3704

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

Contents
Contents .................................................................................Chapter – Page
1Safety ........................................................................................................................... 1 - 1
1.01 Regulations ...................................................................................................................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 Notes for operating and technical staff ......................................................................... 1 - 3
1.05.01 Operating staff .............................................................................................................. 1 - 3
1.05.02 Technical staff ............................................................................................................... 1 - 3
1.06 Danger .......................................................................................................................... 1 - 4
2Proper use.................................................................................................................... 2 -1
3Specifications .............................................................................................................. 3 - 1
4Disposal of Machine ................................................................................................... 4 - 1
5Transportation, packing and storage ......................................................................... 5 - 1
5.01 Transportation to customer's premises ........................................................................ 5 - 1
5.02 Transportation inside the customer's premises ............................................................ 5 - 1
5.03 Disposal of packing materials ........................................................................................ 5 - 1
5.04 Storage ......................................................................................................................... 5 - 1
6Explanation of symbols .............................................................................................. 6 - 1
7Controls ....................................................................................................................... 7- 1
7.01 Main switch .................................................................................................................. 7- 1
7.02 Keys on the machine head (only on machines with Quick-flange motor) ...................... 7 - 1
7.03 Pedal on the PFAFF 939 U ............................................................................................ 7 - 2
7.04 Pedal on the PFAFF 3704-2/.. ........................................................................................ 7 - 2
7.05 Lever for raising presser foot ........................................................................................ 7 - 3
7.06 Knee lever (only on the PFAFF 939 U) ........................................................................... 7 - 3
7.07 Adjustment lever for zigzag stitch and needle position ................................................. 7 - 4
7.08 Reverse-feed key .......................................................................................................... 7 - 4
7.09 Stitch length adjustment wheel .................................................................................... 7 - 5
7.10 Adjustment wheels for the top feed (only on the PFAFF 939 U) ................................... 7 - 5
7.11 Adjustment lever for the differential feed (only on the PFAFF 3704-2/..) ....................... 7 - 6
7.12 Adjustment wheel for multi-stitch and zigzag stitch (only on the PFAFF 939 U) ........... 7 - 6
7.13 Mechanical edge guide (only on the PFAFF 3704-2/02) ................................................. 7 - 7
7.14 Knee switch (only on the PFAFF 3704-2/..).................................................................... 7 - 7
7.15 Control panel (only on machines with Quick-Eco-Drive motor). ..................................... 7 - 8
7.15.01 Screen displays ............................................................................................................. 7 - 8
7.15.02 Function keys ................................................................................................................ 7 - 8

Contents
Contents .................................................................................Chapter – Page
8Installation and commissioning ................................................................................. 8 - 1
8.01 Installation ..................................................................................................................... 8 - 1
8.01.01 Adjusting the table height ............................................................................................. 8 - 1
8.01.02 Fitting the top belt guard (only on the PFAFF 939 U) ..................................................... 8 - 2
8.01.03 Fitting the reel stand ..................................................................................................... 8 - 2
8.02 Fitting the Quick-flange motor (only on the PFAFF 939 U) ............................................ 8 - 3
8.03 Fit the belt guard of the Quick flange-motor. ................................................................ 8 - 3
8.04 Table top cutout for the PFAFF 939 U ........................................................................... 8 - 4
8.05 Table top assembly for the PFAFF 939 U ...................................................................... 8 - 5
8.06 Connecting the plug-in connections and earth cables ................................................... 8 - 6
8.07 Commissioning ............................................................................................................. 8 - 7
8.08 Switching the machine on/off ....................................................................................... 8 - 7
8.09 Basic setting of the machine drive unit ......................................................................... 8 - 8
(only on machines with Quick-Eco-Drive-Motor) .......................................................... 8 - 8
8.10 Mounting/connecting the start inhibitor (only on machines with Quick-Anbaumotor) ... 8 - 10
9Setting up .................................................................................................................... 9 -1
9.01 Inserting the needle ...................................................................................................... 9 - 1
9.02 Winding the bobbin thread; adjusting the primary thread tension ................................. 9 - 2
9.03 Removing/inserting the bobbin case ............................................................................. 9 - 3
9.04 Threading the bobbin case, adjusting the thread tension .............................................. 9 - 3
9.05 Threading the needle thread / Adjusting the needle thread tension
on the PFAFF 939 U and PFAFF 3704-2/03 ................................................................... 9 - 4
9.06 Threading the needle thread / Adjusting the needle thread tension .............................. 9 - 5
on the PFAFF 3704-2/02 ................................................................................................ 9 - 5
9.07 Setting the zigzag stitch and the stitch position ............................................................ 9 - 6
9.08 Adjusting the stitch length ............................................................................................ 9 - 6
9.09 Adjusting the differential feed on the PFAFF 939 U ...................................................... 9 - 7
9.09.01 Sewing without fullness ................................................................................................ 9 - 7
9.09.02 Ständig Mehrweite einarbeiten ..................................................................................... 9 - 7
9.09.03 Applying fullness intermittently ..................................................................................... 9 - 8
9.09.04 Constantly stretch the top material ply. ........................................................................ 9 - 8
9.10 Adjusting the differential feed on the PFAFF 3704-2/.. .................................................. 9 - 9
9.11 Adjusting the multi-stitch or the zigzag stitch
(on the PFAFF 939 U with Quick-flange motor) ............................................................. 9 - 10
9.11.01 Changing from zigzag stitch to multi-stitch ................................................................... 9 - 10
9.11.02 Changing from multi-stitch to zigzag stitch ................................................................... 9 - 10
9.12 Entering start and end backtacks or condensed stitches .............................................. 9 - 11
10 Sewing (only on machines with Quick-Eco-Drive-Motoren) .................................. 10 - 1
10.01 Darning program ......................................................................................................... 10 - 2
10.02 Counted seam ............................................................................................................. 10 - 2
10.03 Error messages ........................................................................................................... 10 - 3
10.04 Example of a seam on the PFAFF 3704-2/02 .............................................................. 10 - 3

Contents
Contents .................................................................................Chapter – Page
11 Care and maintenance .............................................................................................. 11 - 1
11.01 Cleaning ......................................................................................................................11 - 1
11.02 Lubricating the hook .................................................................................................... 11 - 2
11.03 Oiling the zigzag drive ................................................................................................. 11 - 3
11.04 Cleaning the air filter of the air-filter / lubricator ........................................................... 11 - 4
11.05 Checking/adjusting the air pressure ............................................................................ 11 - 4
12 Adjustment ................................................................................................................ 12 - 1
12.01 Notes on adjustment................................................................................................... 12 - 1
12.02 Tools, gauges and other accessories for adjusting ...................................................... 12 - 1
12.03 Abbreviations .............................................................................................................. 12 -1
12.04 Check and adjustment aid ........................................................................................... 12 - 2
12.05 Adjusting the basic machine ....................................................................................... 12 - 3
12.05.01 Balancing weight ......................................................................................................... 12- 3
12.05.02 Centering the needle in the needle hole (in sewing direction) ..................................... 12 - 4
12.05.03 Parallel guiding of the needle bar ................................................................................ 12 - 5
12.05.04 Locking lever ............................................................................................................... 12 - 6
12.05.05 Zero stitch and zigzag stitch scale ............................................................................... 12 - 7
12.05.06 Centering the needle in the needle hole (crosswise to sewing direction).................... 12 - 8
12.05.07 Zigzag stitch width ...................................................................................................... 12- 9
12.05.08 Multi-stitch movement (only on the PFAFF 939 U) ..................................................... 12 - 10
12.05.09 Zigzag stitch movement (only on the PFAFF 3704-2/..) ............................................... 12 - 11
12.05.10 Needle penetration symmetry (only on the PFAFF 3704-2/..) ...................................... 12 - 12
12.05.11 Zigzag movement (only on the PFAFF 939 U) ............................................................. 12 - 13
12.05.12 Target positioning sensor (only on the PFAFF 939 U) .................................................. 12 - 14
12.05.13 Needle position adjustment lever ................................................................................ 12 - 15
12.05.14 Adjustment wheels for differential feed (only on the PFAFF 939 U) ........................... 12 - 16
12.05.15 Zeroing the differentiatio (only on the PFAFF 939 U) ................................................... 12 - 17
12.05.16 Differential feed synchronisation (only on the PFAFF 3704-2/..) .................................. 12 - 18
12.05.17 Position of the stitch length adjustment wheel on the PFAFF 939 U. ......................... 12 - 19
12.05.18 Position of the stitch length adjustment wheel on the PFAFF 3704-2/.. ...................... 12 - 20
12.05.19 Zeroing the main feed (rear feed dog) on the PFAFF 939 U ........................................ 12 - 21
12.05.20 Zeroing the main feed (rear feed dog) on the PFAFF 3704-2/.. .................................... 12 - 22
12.05.21 Zeroing the differential feed (front feed dog) on the PFAFF 939 U .............................. 12 - 23
12.05.22 Zeroing the differential feed (front feed dog) on the PFAFF 3704-2/.. ......................... 12 - 24
12.05.23 Torsion spring of the reverse feed lever on the PFAFF 939 U ..................................... 12 - 25
12.05.24 Torsion spring of the reverse feed lever on the PFAFF 3704-2/.. ................................ 12 - 26
12.05.25 Torsion spring of the differentiation regulating shaft on the PFAFF 939 U .................. 12 - 27
12.05.26 Torsion spring of the differentiation regulating shaft on the PFAFF 3704-2/.. .............. 12 - 28
12.05.27 Feeding motion of the main and differential feeds ...................................................... 12 - 29
12.05.28 Lifting stroke of the main and differential feed dogs ................................................... 12 - 30
12.05.29 Height of the main and differential feed dogs ............................................................. 12 - 31
12.05.30 Drive belt in the gearbox housing ................................................................................ 12 - 32
12.05.31 Hook bearing bracket .................................................................................................. 12 - 33
12.05.32 Hook lubrication .......................................................................................................... 12 - 34

Contents
Contents .................................................................................Chapter – Page
12.05.33 Pre-adjusting the needle height ................................................................................... 12 - 35
12.05.34 Needle rise, hook-to-needle clearance and bobbin case positioning-finger .................. 12 - 36
12.05.35 Final adjustment of the needle height ......................................................................... 12 - 37
12.05.36 Bobbin case opener position ....................................................................................... 12 - 38
12.05.37 Bobbin case opener motion ........................................................................................ 12 - 39
12.05.38 Presser foot to needle plate clearance / Presser foot pressure ................................... 12 - 40
12.05.39 Thread diverter pin ...................................................................................................... 12-41
12.05.40 Limiting the knee lever stroke ..................................................................................... 12 - 42
12.05.41 Knee lever play ............................................................................................................12 -43
12.05.42 Bobbin winder ............................................................................................................. 12 - 44
12.05.43 Stitch condensation (only on the PFAFF 3704-2/02) .................................................... 12 - 45
12.05.44 Switching to reverse feed (only on the PFAFF 3704-2/03) .......................................... 12 - 46
12.05.45 Thread puller (only on the PFAFF 3704-2/02) ............................................................... 12 - 47
12.06 Adjusting the thread trimmer -900/24 ......................................................................... 12 - 48
12.06.01 Axial position of the control cam ................................................................................. 12 - 48
12.06.02 Preliminary adjustment of the control cam ................................................................. 12 - 49
12.06.03 Position of the thread catcher and cutting test ........................................................... 12 - 50
12.06.04 Readjustment of the control cam ................................................................................ 12 - 51
12.06.05 Needle thread tension release .................................................................................... 12 - 52
12.07 Parameter settings ...................................................................................................... 12 - 53
12.07.01 Selecting the user level ............................................................................................... 12 - 53
12.07.02 Example of a parameter input ..................................................................................... 12 - 54
12.07.03 Liste der Parameter .................................................................................................... 12 - 55
12.08 Explanation of the error signals ................................................................................... 12 - 56
12.09 Reset / Cold start ........................................................................................................ 12 - 57
12.10 Internet update of the machine software .................................................................... 12 - 58
13 Wearing parts ............................................................................................................ 13 - 1
14 Circuit diagrams ........................................................................................................ 14 - 1

Safety
1 - 1
1 Safety
1.01 Regulations
This machine is constructed in accordance with 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 applicable pol-
lution control regulations!
The valid regulations of the regional social insurance society for occupational accidents or
other supervisory authorities are to be strictly adhered to!
1.02 General notes on safety
●The machine must only be operated by adequately trained operators and only when the
instruction manual has been fully read and understood!
●All notices on safety and the instruction manual of the motor manufacturer are to be read
before the machine is put into operation!
●All notes on the machine concerning danger and safety must be observed!
●The machine must be used for the purpose for which it is intended 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, needle plate, feed dog or bob-bin),
during threading, when the workplace is left unattended and during maintenance work,
the machine must be isolated from the power supply by turning off 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 appropriate training!
●During maintenance or repairs on the pneumatic system the machine must be isolated
from the compressed air supply! The only exception to this is when adjustments or
function checks are carried out by appropriately trained technical staff!
●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!
●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 characteristics of the machine. We shall not ac-
cept any liability for damage caused by the use of non-original parts.

Safety
1 - 2
1.03 Safety symbols
Danger!
Special points to observe.
Danger of injury to operating or technical staff!
Electric voltage!
Danger to operating or technical staff!
Caution
Do not operate without finger guard and safety
devices.
Before threading, changing bobbin and needle,
cleaning etc. switch off main switch.
I
1.04 Important notes for the user
●This instruction manual belongs to the equipment of the machine and must be available
to the operating staff at all times.
This 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 mach-
ine 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 work-
ing 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 eliminating any malfunctioning in the sewing area.
The operating staff is obliged to observe the following points:
●The notes on safety in this instruction manual must always be observed!
●Any working methods, which adversely affect the safety of the machine, must be
avoided.!
●Loose-fitting clothing should be avoided. No jewellery, such as chains and rings,
should be worn!
●Ensure that only authorised persons enter the danger area of the machine!
●Any changes occurring on the machine, which may affect its safety, must be
reported to the user immediately.
1.05.02 Technical staff
Technical staff are persons who have been trained in electrical engineering/electronics
and mechanical engineering. They are responsible for lubricating, servicing, repairing
and adjusting the machine.
The technical staff is obliged to observe the following points:
●The notes on safety in this instruction manual must always be observed!
●Before carrying out any adjustment or repair work the main switch must be switched
off and measures taken to prevent it from being switched on again!
●Never work on parts or equipment still connected to the power supply! Exceptions
are only permissible in accordance with the regulations EN 50110.
●All safety covers must be replaced after the completion of maintenance or repair
work!

Safety
1 - 4
Do not operate the machine without the take-up lever guard 1!
Danger of injury through the movement of the take-up lever.
Do not operate the machine without finger guard 2!
Danger of injury from the needle!
Do not operate machines with Quick-flange motor without start inhibitor 3!
Danger of injury if the machine is started accidentally!
Do not operate machines with Quick-underfloor motor without belt guard 4and 5.
Danger of injury from the drive belts!
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 slung away! Danger of injury!
112-024
5
Fig. 1 - 01
4
1
92-002
3
2

Proper use
2 - 1
2 Proper use
The PFAFF 939 U is a high-speed zigzag sewing machine with differential bottom feed and
mechanical shift from zigzag to 3-stitch zigzag.
The machines are used for producing zigzag lockstitch seams in the clothing and linen
industry.
The PFAFF 3704-2/02 is an engineered workplace with high-speed zigzag sewing machine.
The machine is used to sew collars in the outerwear clothing industry.
Planned operation: Sew undercollar to top collar, with imitation hand stitch and fullness
application
The PFAFF 3704-2/03 is an engineered workplace with high-speed zigzag sewing machine.
The machine is used to sew collars in the outerwear clothing industry.
Planned operation: Sew undercollar to top collar, with zigzag seam and fullness application
Any use of these machines which is not approved by the manufacturer shall be
considered as improper use! The manufacturer shall not be liable for any dam-
age arising out of improper use! Proper use shall also be considered to include
compliance with the operation, adjustment, service and repair measures speci-
fied by the manufacturer!

Specifications
3 - 1
3 Specifications ▲
Stitch type: ........................................................................................ 304 (zigzag lockstitch)
Needle system
PFAFF 939 U / PFAFF 3704-2/03: .................................................................................. 438
PFAFF 3704-2/02: ..................................................................................................... 134 EL
Needle size in 1/100 mm:
Model B: .................................................................................................................80 - 100
Presser foot clearance: .............................................................................................. 7 mm
Clearance width: .................................................................................................... 260 mm
Clearance height: ................................................................................................... 130 mm
Bedplate dimensions: ................................................................................... 476 x 177 mm
Sewing head dimensions:
Length: ..............................................................................................................ca. 550 mm
Width: ...............................................................................................................ca. 180 mm
Height (above table): .........................................................................................ca. 300 mm
Max. stitch length: ...................................................................................................... N24*
Max. speed
PFAFF 939 U: .................................................................................................... 4500 spm ◆
PFAFF 3704-2/..: ................................................................................................ 5500 spm ◆
Max. stitch with ...................................................................................................... 6,0 mm
Connection data (for Quick motors)
Operating voltage: ...........................................................................230 V ± 10%, 50/60 Hz
Max. power ............................................................................................................. 1,2 kVA
Fuse protection: ............................................................................................ 1 x 16 A, inert
Noise data:
Noise emission level at workplace with a sewing speed of 3600 spm: ..... LpA < 80 dB(A) ■
(Noise measurement in accordance with DIN 45 635-48-A-1, ISO 11204, ISO 3744, ISO 4871)
Working air pressure: .................................................................................................. 6 bar
Air consumption ............................................................................................ ca. 1 N1/cycle
Net weight of sewing head: .................................................................................. ca. 48 kg
Gross weight of sewing head: .............................................................................. ca. 56 kg
▲Subject to alterations
◆The maximum speed depends on the material, operation and stitch length.
■ KpA = 2,5 dB
* = 2.5 mm feed stroke of the rear and 4.5 mm of the front feed dog

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
The machines are delivered completely 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)

7 - 1
Controls
112-001
7.02 Keys on the machine head (only on machines with Quick-flange motor)
●As long as key 1is pressed during
sewing, the machine sews in reverse.
●Bring the machine into a switching
position (for switching from zig-zag to
multi-stitch or from multi-stitch to zig-zag)
by operating key 2.
●Key 3can be assigned with the
appropriate parameter settings, see
Motor Instruction Manual.
Fig. 7 - 02
Fig. 7 - 01
7 Controls
7.01 Main switch
●The machine is switched on or off by
turning the main switch 1.
1
04
1
2
3

7 - 2
Controls
112-002
7.03 Pedal on the PFAFF 939 U
0= Resting position
+1 = Lower presser foot
+2 = Sew
-1 = Lift presser-foot (on machines
with automatic presser-foot
lifter)
-2 = Trim thread (on machines with
a thread trimmer)
3 + (+2) = Requesting the second feed
stroke value.
4 + (+2) = Reverse sewing
Further function-combinations
can be found in the instruction
manual of the motor
manufacturer.
Fig. 7 - 03
30+1
4-1 -2
7.04 Pedal on the PFAFF 3704-2/..
The position of the presser foot
and the needle depend on the
selected functions, see Chapter
7.15 Control panel.
0 = Machine stop
+1 = Lower presser foot or sewing start
+2 = Sew
-1 = Raise presser foot
-2 = End bartack and trim thread
Fig. 7 - 04
0
-1 -2
+1
+2
+2

7 - 3
Controls
7.05 Lever for raising presser foot
●The presser foot is raised by turning
lever 1.
Fig. 7 - 05
1
7.06 Knee lever (only on the PFAFF 939 U)
●On machines without an automatic pres-
ser foot lift, the knee lever 1is used to
raise the presser foot.
Fig. 7 - 06
112-003
1

7 - 4
Controls
112-025
92
-
006
7.07 Adjustment lever for zigzag stitch and needle position
●The zigzag stitch adjustment lever 1is
used for adjusting the width of the zigzag
stitch.
●To change the position of the adjustment
lever, the locking lever 2must be
pressed against the adjustment lever 1.
The current zigzag-stitch width
can be seen on scale 3.
●By turning the needle-position
adjustment lever 4the required needle
position can be set.
L= needle-position left
M= needle-position center
R= needle-position right
Fig. 7 - 07
4
M
L
R
2
1
3
1
Fig. 7 - 08
7.08 Reverse-feed key
●The machine sews in reverse as long as the reverse-feed key 1is pressed.
Fig. 7 - 09
1

7 - 5
Controls
112-004
7.09 Stitch length adjustment wheel
1
0
2
3
4
Fig. 7 - 10
2
1
●Set the stitch length by turning the stitch length adjustment wheel 1.
The stitch length setting can be read on scale 2.
Fig. 7 - 11
1
2
PFAFF 939 U PFAFF 3704-2/..
7.10 Adjustment wheels for the top feed (only on the PFAFF 939 U)
●Adjustment wheel 1(1st setting)
This adjustment wheel is for adjusting the
setting with which the machine is
to do most of its work.
Green area = Apply fullness
Red area = Stretch
Zero = Normal sewing
(The main and differential
feed dogs work with the
same feed stróke).
●Adjustment wheel 2(2nd setting)
Adjustment wheel 2is used for setting a
value, which deviates from the first
setting. This value can be selected with
the second pedal (see Chapter 7.03
Pedal).
1
2
1
0
2
3
4
Fig. 7 - 12