DURKOPP ADLER 888 User manual

888
Spezialnähmaschine
Betriebsanleitung
Instruction manual
Postfach 17 03 51, D-33703 Bielefeld • Potsdamer Straße 190, D-33719 Bielefeld
Telefon +49 (0) 521 / 9 25-00 • Telefax +49 (0) 521 / 9 25 24 35 • www.duerkopp-adler.com
D
GB
Ausgabe / Edition: Änderungsindex Teile-Nr./Part.-No.:
09/2010 Rev. index: 04.0 Printed in Federal Republic of Germany 0791 888740

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Eigentum der Dürkopp Adler AG und urheberrechtlich geschützt. Jede, auch auszugsweise
Wiederverwendung dieser Inhalte ist ohne vorheriges schriftliches Einverständnis der Dürkopp Adler AG
verboten.
All rights reserved.
Property of Dürkopp Adler AG and copyrighted. Reproduction or publication of the content in any manner,
even in extracts, without prior written permission of Dürkopp Adler AG, is prohibited.
Copyright © Dürkopp Adler AG - 2010

Foreword
This instruction manual is intended to help the user to become familiar
with the machine and take advantage of its application possibilities in
accordance with the recommendations.
The instruction manual contains important information on how to
operate the machine securely, properly and economically. Observation
of the instructions eliminates danger, reduces costs for repair and
down-times, and increases the reliability and life of the machine.
The instruction manual is intended to complement existing national
accident prevention and environment protection regulations.
The instruction manual must always be available at the machine/sewing
unit.
The instruction manual must be read and applied by any person that is
authorized to work on the machine/sewing unit. This means:
–Operation, including equipping, troubleshooting during the work
cycle, removing of fabric waste,
–Service (maintenance, inspection, repair) and/or
–Transport.
The user also has to assure that only authorized personnel work on the
machine.
The user is obliged to check the machine at least once per shift for
apparent damages and to immediatly report any changes (including the
performance in service), which impair the safety.
The user company must ensure that the machine is only operated in
perfect working order.
Never remove or disable any safety devices.
If safety devices need to be removed for equipping, repairing or
maintaining, the safety devices must be remounted directly after
completion of the maintenance and repair work.
Unauthorized modification of the machine rules out liability of the
manufacturer for damage resulting from this.
Observe all safety and danger recommendations on the machine/unit!
The yellow-and-black striped surfaces designate permanend danger
areas, eg danger of squashing, cutting, shearing or collision.
Besides the recommendations in this instruction manual also observe
the general safety and accident prevention regulations!

General safety instructions
The non-observance of the following safety instructions can cause
bodily injuries or damages to the machine.
1. The machine must only be commissioned in full knowledge of the
instruction book and operated by persons with appropriate training.
2. Before putting into service also read the safety rules and
instructions of the motor supplier.
3. The machine must be used only for the purpose intended. Use of
the machine without the safety devices is not permitted. Observe all
the relevant safety regulations.
4. When gauge parts are exchanged (e.g. needle, presser foot, needle
plate, feed dog and bobbin) when threading, when the workplace is
left, and during service work, the machine must be disconnected
from the mains by switching off the master switch or disconnecting
the mains plug.
5. Daily servicing work must be carried out only by appropriately
trained persons.
6. Repairs, conversion and special maintenance work must only be
carried out by technicians or persons with appropriate training.
7. For service or repair work on pneumatic systems, disconnect the
machine from the compressed air supply system (max. 7-10 bar).
Before disconnecting, reduce the pressure of the maintenance unit.
Exceptions to this are only adjustments and functions checks made
by appropriately trained technicians.
8. Work on the electrical equipment must be carried out only by
electricians or appropriately trained persons.
9. Work on parts and systems under electric current is not permitted,
except as specified in regulations DIN VDE 0105.
10. Conversion or changes to the machine must be authorized by us
and made only in adherence to all safety regulations.
11. For repairs, only replacement parts approved by us must be used.
12. Commissioning of the sewing head is prohibited until such time as
the entire sewing unit is found to comply with EC directives.
13. The line cord should be equipped with a country-specific mains
plug. This work must be carried out by appropriately trained
technicians (see paragraph 8).
It is absolutely necessary to respect the safety
instructions marked by these signs.
Danger of bodily injuries !
Please note also the general safety instructions.

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Contents Page:
Introduction and safety instructions
Part 1: Operating Instructions Class 888 – Original Instructions
(Edition 09/2010)
1 Product description ........................................... 4
2 Designated use .............................................. 4
3 Subclasses ................................................. 5
4 Optional equipment ............................................ 7
5 Technical data
5.1 Technicaldatasubclasses......................................... 9
6 Operation
6.1 Threadingtheneedlethread ....................................... 10
6.2 Winding the hook thread.......................................... 11
6.3 Bobbin insertion and threading the hook thread ........................... 11
6.4 Adjustingthethreadtension ....................................... 12
6.4.1 Adjusting the hook thread tension .................................... 12
6.4.2 Adjustingtheneedlethreadtension................................... 13
6.5 Switchingon/offthethreadtensioners................................. 15
6.5.1 Function of the thread main tension and the thread supplementary tension in relation
tothesewingfootlifting.......................................... 16
6.6 Adjustingthethreadregulator ...................................... 17
6.7 Changing the needle with single-needle machines with the hook on the right.......... 18
6.8 Changing the needle with single-needle machines with the hook on the left
(machinewithlowerthreadtrimmer)................................... 19
6.9 Changingtheneedlewithdouble-needlemachines ......................... 20
6.10 Liftingandfoldingtherollerpresser................................... 21
6.11 Sewing-footpressure............................................ 22
6.11.1 Setting through the setting wheel .................................... 22
6.11.2 Constant sewing-foot pressure through the cylinder ......................... 23
6.12 Sewing backward (feeding backward; backtacking) ......................... 23
6.13 Settingthestitchlength.......................................... 25
6.14 Switching on the safety clutch at the hook blocking ......................... 26
6.15 Startingthemanuallycontrolledmachinewiththeclutchmotor.................. 27
6.16 Operatingthemachineequippedwiththepositioningmotor.................... 28
6.16.1 Usingthepedal............................................... 28
6.16.2 Using the key ................................................ 31
6.17 Materialedgetrimmercontrol ...................................... 33
6.17.1 Switchingon/offedgetrimmer...................................... 33
6.17.2 Switchingon/offmaterialguide...................................... 34
6.17.3 Materialguideadjustment......................................... 35
6.17.4 Disengaging the needle bar with subclass 888-460522 ....................... 34

Contents page:
7 Positioning drive Efka DC1550/DA321G ............................... 35
8 Sewing with machine equipped with positioning motor
8.1 Machineautomaticfunction ....................................... 36
8.2 Exampleofmachineoperationatsewing ............................... 37
9 Maintenance
9.1 Cleaning and checking .......................................... 38
9.2 Lubrication.................................................. 41

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1 Product description
The Dürkopp Adler 888 is a special sewing machine for universal use.
•It is a double lockstitch post bed sewing machine .
•It has a two step feed. A lower wheel feeder and a driven roller
presser feed in two steps, a needle feed feeds in the first step only.
In single needle machines, the first step represents 50% of the
total stitch length; in double needle machines it represents 30%.
•Depending on subclass, the machine is either single needle or
double needle unit with automatic functions such as thread
trimming, automatic backtacking, automatic foot lifting, or without
them.
•The single needle machine can be equipped with edge trimming
with a hook post to the left of the needle.
•The machine is equipped with a large two part vertical hook.
•Maximum foot lift is 12 mm.
•The residual thread length after thread trimming is about 15 mm.
•The hook is protected with a safety clutch against the
disarrangement of the adjusted position at the blocking of the
thread which interfered with its way.
•The throat plate has replaceable inserts with the stitch hole
dimension difference, which are optional in dependence on the
needle number.
•The machine has automatic wick lubrication from the central oil
tank with a visual check of the oil level by oil level indicator in the
machine arm. The part of the oil with which the hook is lubricated is
devaluated. The other part of the lubrication oil is returned to the
central tank by a pump.
•Integrated bobbin winder.
2 Designated use
The class 888 is designated for sewing shoe, leather, and upholstery
sewing. In general, the material sewn is leather (natural or artificial).
It is possible to use it for shoe fabrics too.
The equipment for light, medium or heavy sewing is mounted on the
machine as an option.
The subclass with material trimming is designated especially for the
shoe lining trimming if the lining has the corresponding strength. The
cutting mechanism allows the lining trimming under the leather
surface layer. It is possible to trim also all sewn layers.
It is possible to sew dry material only which may not be thicker than 7
mm when pressed down with a roller presser. The material may not
contain hard objects, as the machine is not equipped with an eye
guard. This machine may be operated in dry rooms and by a trained
person only who is aware of the risks described in this instruction.
This special sewing machine may be set up and operated only
in dry, well-maintained premises. If the sewing machine is used in
premises which are not dry and well-maintained it may be
necessary to take further precautions (which should be agreed in
advance - see EN 60204-31:1999).

As manufacturers of industrial sewing machines we proceed on the
assumption that personnel who work on our products will have
received training at least sufficient to acquaint them with all normal
operations and with any hazards which these may involve.
3 Subclasses
888-160020 Single-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook.
888-260020 Double-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook.
888-160122 Single-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook, electro-magnetic thread
cutter, electro-magnetic seam bartacking and
sewing foot lifting.
Short stitch equipment: By pressing a key on the
machine head a complete stitch with shortened
stitch length is sewn.
888-260122 Double-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook, electro-magnetic thread
cutter, electro-magnetic seam bartacking and
sewing foot lifting.
Short stitch equipment: By pressing a key on the
machine head a complete stitch with shortened
stitch length is sewn.
888-356020 Single-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook, equipped with electro
motor driven edge trimmer.
888-356122 Single-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook, electro-magnetic thread
cutter, electro-magnetic seam bartacking and
sewing foot lifting, equipped with electro motor
driven edge trimmer.
Short stitch equipment: By pressing a key on the
machine head a complete stitch with shortened
stitch length is sewn.
888-160522 Single-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook, electro-magnetic thread
cutter, pneumatic second stitch length, seam
bartacking and sewing foot lifting.
888-260522 Double-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and large hook, electro-magnetic thread
cutter, pneumatic second stitch length, seam
bartacking and sewing foot lifting.
888-160152 Single-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and regular hook, electro-magnetic thread
cutter, electro-magnetic seam bartacking and
sewing foot lifting.
Short stitch equipment: By pressing a key on the
machine head a complete stitch with shortened
stitch length is sewn.
6

888-356152 Single-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot and regular hook, electro-magnetic thread
cutter, electro-magnetic seam bartacking and
sewing foot lifting, equipped with electro motor
driven edge trimmer.
Short stitch equipment: By pressing a key on the
machine head a complete stitch with shortened
stitch length is sewn.
888-460522 Double-needle double lockstitch post bed sewing
machine with feed wheel, needle feed with driven
roller foot, equipped with disengageable needle bar
and large hook, electro-magnetic thread cutter,
pneumatic second stitch length, seam bartacking
and sewing foot lifting.
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4 Optional equipment
The following optional equipments are available for the class 888 :
Order No. Optional equipment Subclasses
888-160020 888-160122 888-260020 888-260122 888-356020 888-356122 888-160522 888-260522 888-160152 888-356152 888-460522
9880 888101 Integrated sewing light with 2 LED, incl. xxxxxxxxxxx
dimmer transformer
9880 888100 Diode sewing light 3W xxxxxxxxxxX
0888 320254 Variator for a continuous regulation of x x o o x x x o
the difference between the feed wheel and
the driven roller foot
0688 130384 Knee lever for the sewing foot lifting xxxxxxxxxXX
9780 000108 WE-8, maintenance unit x x x
for the pneum. optional equipment
0797 003031 Pneumatic connection kit for the connection x x x
of the stand with the maintenance unit
9805 791113 USB-Memory-Stick for data transfer with xxxxxxxxxxX
the EFKA Control DA321G
0867 490010 Bracket for the control panel x x x x xxxx
N800 080030 Rectractable material guide xxxxooxxxo
N800 080040 Retractable roller material guide xxxxxxxxxx
Stands
MG 55 400334 Stand set MG 55-3 xxxxxxxxxxx
for toothed belt drive, with pedal
Table top size 1060 x 500 mm
MG55 400324 Stand set MG 55-3 xxxxxx
forV-beltdrive,withpedal
Table top size 1060 x 500 mm
x = Optional equipment
o = Standard equipment
Additional optional equipments can be requested at our Application
Center (APC).
E-Mail: [e-mail]
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5 Technical data
Noise: Workplace-related emission value in accordance with DIN 45635-48-A-1-KL2
888-160020 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-160122 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-260020 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-260122 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-356020 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-356122 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-160522 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-260522 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-160152 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-356152 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
888-460522 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: mm Speed: ____ min -1
Material:
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5.1 Technical data of the subclasses
Subclasses
888-160020 888-160122 888-260020 888-260122 888-356020 888-356122 888-160522 888-260522 888-160152 888-356152 888-460522
Type of stitch Lock stitch 301
Hook type
large large large large large large large large standard standard large
Numberofneedles 112211121 12
Needle system 134
Needle size 160
(depending on E-No.) [Nm]
Max. thread thickness [Nm] 10/3
Stitch length [mm]
Forwards 7
Backwards 7
Max. Speed [min-1] 3000
Number of stitches with
factory setting [min-1] 2500
Max. sewing foot stroke [mm] 12
Operatingpressure [bar]--------66-
Air consumption per
workingcycle [NL]--------0,70,7-
Dimensions (H x W x D) [mm] 550 / 220 / 600
More detail about the technical data are given in the chapter 3.2.
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6 Operation
6.1 Threading the needle thread
Caution! Risk of injury!
Turn off the main switch.
The needle thread may only be threaded with the sewing machine
switched off.
–Thread the single needle machine according to fig. (A). If the
machine is equipped for heavy sewing, wind the thread around the
pin (1).
–Thread the double needle machine according to fig. (B). The
thread (2) designed for the left needle is to be threaded in the left
tensioners and in the upper hole in the thread lever (4).
–Thread the needles arranged side by side according to fig. (B).
–Thread the diagonally arranged needles according to fig. (C-right
needle) and fig. (D-left needle).
–Thread the machine with an edge trimming mechanism according
to the fig. (E).
–If the machine is equipped for heavy sewing, wind the threads
around the pin (5).
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E
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DC
B
A
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6.2 Winding the hook thread
–Thread the thread according to the picture.
–Insert the thread under the knife (1) and tear off by pulling in the
arrow direction (2).
–Fix the bobbin and press the lever (3) in the direction (4).
–Start the machine up.
–After the thread winding, slide the thread under the knife again (1)
and tear it off.
–Insert another bobbin immediately and press the lever (3).
6.3 Inserting the bobbin and threading the hook thread
Caution! Risk of injury!
Switch the main switch off and wait till the motor stops.
–Tilt the shutter (1) up.
–Insert the bobbin (2) with the thread end (3) oriented according to
the picture.
–Thread the thread through the slit (4) and space (5), hook upon the
shutter (1) and fasten it under the spring (6).
–Trim the thread ends according to the picture.
–If the hook is located to the left of the needle, fix the bobbin and
do the threading in a similar way.
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6.4 Adjusting the thread tension
6.4.1 Adjusting the hook thread tension
Caution! Risk of injury!
Turn off the main switch.
The hook thread tension may only be adjusted with the machine
switched off.
–Adjust the hook thread tension via the screw (1). Insert a
screwdriver through the hole (2).
Increase the tension by tightening the screw.
–Measure the thread tension with a dynamometer. Thread the
thread according to the picture and pull in the arrow direction (3).
This tension is adjusted in the factory in dependence on the
selected sewing equipment according to the table below, and it is
suitable for the usual sewing operations.
For sewing thin soft materials, it is necessary to reduce the
tension. If the seam is to be tightened strongly, it is necessary to
increase the tension and reduce the sewing speed at the same
time.
–Thread tension of the hook located to the left of the needle is
adjusted and measured in a similar way. For this hook, the tension
is set up by 10 - 20 % lower than for the hook on the right.
Hook thread tension mean value
Sewing category Used needle-Number Thread tension in
grams
light 70 - 80 50
medium 90 - 110 65
heavy 120 - 160 90
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1
2
3

6.4.2 Adjusting the needle thread tension
Adjusting the pre-tensioner (1)
–Adjust the supplementary tensioner (1) so that it has the lowest
tension possible, but so high that, when taking out the sewn
material after the preceding trimming (when the tensioners (2)
and (3) are switched off), the thread is not pulled out of the
tensioner (1). (Tensioner (1) is not switched off at the foot lifting).
Adjusting tensioners (2) and (3)
ECO and CLASSIC machines with electro-magnetic control
–The machine can be equipped with a lever (4) for the tensioner (2)
temporary switching off. In this case, two thread tension values
can be pre-selected and a good stitch tightening can be achieved
when sewing over a variable number of layers of the sewn material
with one seam.
–Switch the tensioner off (2) with the lever (4) and sew on a smaller
number of layers.
–Regulate the thread tension with the tensioner (3), till a good
thread loop is achieved (see below).
–Switch the tensioner on (2) by the lever (4) shifting out and sew on
a greater number of layers.
–Regulate the thread tension with a tensioner (2), till a good thread
loop is achieved (see below).
–If the machine is not equipped with the lever (4), regulate the
tension by both tensioners (2) and (3) at the same time so that
their nuts are screwed approximately in the same height.
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5

Adjusting tensioners (2) and (3)
CLASSIC machines with pneumatic control
–Through pressing the key (5) the additional tension (2) will be
switched off. If the key (5) is pressed anew, the additional tension
will be activated again. The connectable additional tension (2)
helps in quick adjustment of the needle thread tension, for
example in order to get a tight stitch formation with regular seams
when sewing different materials.
–Press the key (5)
–Sew material with few layers and regulate the thread tension via
the main tensioner (3) until the correct interlacing of the thread is
reached (see illustration).
–Sew material with more layers, switch on the additional tension (2)
via the key (5) and regulate it until the correct interlacing of the
thread is reached.
Correct interlacing of threads in the center
of the material
Needle-thread tension too weak
or
Hook-thread tension too strong
Needle-thread tension too strong
or
Hook-thread tension too weak
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6.5 Switching on/off the thread tensioners
ECO and CLASSIC machines with electro-magnetic control
–When pulling the hand lever (1) towards the operator, the
tensioners (3) and (4) are switched off.
–Tensioner (2) is never switched off.
Manually controlled machines (without thread trimming)
–Tensioners (3) and (4) are mechanically switched off when the foot
is lifted with a hand or knee lever.
Machines with thread trimming
–Tensioners (3) and (4) are switched off with an electric magnet or
pneumatic cylinder at the foot automatic lifting. If the automatic
foot lifting at the machine stop is pre-selected, the tensioners are
switched off, but temporarily only, so that the switching off electric
magnet does not overheat.
–Tensioners (3) and (4) are also switched off temporarily during the
trimming cycle.
–Tensioners (3) and (4) are not switched off at the foot lifting with
the hand or knee lever.
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5

6.5.1 Function of the thread main tension and the thread supplementary tension in relation to the sewing
foot lifting
The thread supplementary tension can, at any time, be switched on or
off by actuating key 4 (see chapter 6.5) of the key pad. To this end,
the parameter F-147 must be set on “1".
Sewing foot lifting Sewing foot lifting
during seam after
thread trimming
Parameter Thread- Thread- Thread- Thread-
Setting main- supplement.- main supplement.
tension tension tension tension
F-196=0 0 0 0 0
F-196=1 1 1 0 0
F-196=2 0 0 1 1
F-196=3 1 1 1 1
1 = Thread tension opened mechanically
0 = Thread tension closed mechanically
•If the thread’ s supplementary tension is opened, this condition will
be maintained when lifting the sewing foot.
•When switching the machine off, the last setting of the thread’s
supplementary tension will be maintained through the mains
connection.
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6.6 Adjusting the thread regulator
The thread regulator (2) controls the quantity of needle thread required
for stitch formation.
The thread regulator must be precisely adjusted for an optimum result.
–Loosen the screw (1), shift the thread regulator (2), and tighten the
screw (1).
–For most of the sewing operations, the thread regulator optimal
setting is with its right edge set to ‘2’.
–The setting ‘3’ is suitable for thin materials and very short stitches
only.
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