Duerkopp Adler 251-140042 Operating Instruction

CONTENTS

1.SPECIFICATIONS......................................................................................................

2.INSTALLATION...........................................................................................................

3.INSTALLATION OF THE SYNCHRONIZER...................................................................

4.ASSEMBLY OF HAND WHEEL.....................................................................................

5.INSTALLATION OF HAND WHEEL...............................................................................

6.INSTALLING THE BELT COVER ..................................................................................

7.ADJUSTING THE HEIGHT OF THE KNEE LIFTER.........................................................

8.INSTALLING THE THREAD STAND..............................................................................

9.LUBRICATION...........................................................................................................

10.ADJUSTING THE AMOUNT OF OIL(OIL SPLASHES)IN THE HOOK................................

11.ATTACHING THE NEEDLE..........................................................................................

12.SETTING THE BOBBIN IHE BOBBIN CASE..................................................................

13.ADJUSTING THE STITCH LENGTH...........................................................................

14.PRESSER FOOT PRESSURE...................................................................................

15.HAND LIFTER.........................................................................................................

16.ADJUSTING THE HEIGHT OF THE PRESSER BAR....................................................

17.THREADING THE MACHINE HEAD...........................................................................

18.THREAD TENSION...................................................................................................

19.THREAD TAKE-UP SPRING......................................................................................

20.ADJUSTING THE THREAD TAKE-UP STROKE...........................................................

21.NEEDLE-TO-HOOK RELATIONSHIP..........................................................................

22.HEIGHT OF THE FEED DOG.....................................................................................

23.TILT OF THE FEED DOG...........................................................................................

24.ADJUSTING THE FEED TIMING................................................................................

25.MOTOR PULLEYS AND BELTS..................................................................................

26.COUNTER KNIFE.....................................................................................................

27.PEDAL PRESSURE AND PEDAL STROKE..................................................................

28.ADJUSTMENT OF THE PEDAL..................................................................................

29.PEDAL OPERATION.................................................................................................

30.ONE-TOUCH TYPE REVERSE FEED STITCHING MECHANISM..................................

31.WIPER....................................................................................................................

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IMPORTANT SAFETY INSTRUCTIONS

Putting sewing systems into operation is prohibited until it has been ascertained that the sewing systems in
which these sewing machines will be built into, have confirmed with the safety regulations in your country.
Technical service for those sewing systems is also prohibited.

1. Observe the basic safety measures, including, but not limited to the following ones, whenever you use
the machine.

2. Read all the instructions, including, but not limited to this Instruction Manual before you use the
machine. In addition, keep this Instruction Manual so that you may read it at anytime when necessary.

3. Use the machine after it has been ascertained that it conforms with safety rules/standards valid in your
country,

4. All safety devices must be in position when the machine is ready for work or in operation.
The operation without the specified safety devices is not allowed.

5. This machine shall be operated by appropriately-trained operators.

6. For your personal protection, we recommend that you wear safety glasses.

7. For the following, turn off the power switch or disconnect the power plug of the machine from the
receptacle.
7-1 For threading needle(s), looper, spreader etc. and replacing bobbin.
7-2 For replacing part(s) of needle, presser foot, throat plate, looper, spreader, feed dog. needle guard,
folder, cloth guide etc.
7-3 For repair work.
7-4 When leaving the working place or when the working place is unattended.
7-5 When using clutch motors without applying brake, it has to be waited until the motor stopped totally.

8. If you should allow oil, grease, etc. used with the machine and devices to come in contact with your
eyes or skin or swallow any of such liquid by mistake, immediately wash the contacted areas and
consult a medical doctor.

9. Tampering with the live parts and devices, regardless of whether the machine is powered, is prohibited.

10. Repair, remodeling and adjustment works must only be done by appropriately trained technicians or
specially killed personnel. Only spare parts designated by Duerkopp Adler Manufacturing (Shanghai)
Co.,Ltd.can be used for repairs.

11. General maintenance and inspection works have to be done by appropriately trained personnel.

12. Repair and maintenance works of electrical components shall be conducted by qualified electric
technicians or under the audit and guidance of special skilled personnel.
Whenever you find a failure of any of electrical components, immediately stop the machine.

13. Before making repair and maintenance works on the machine equipped with pneumatic parts such as
an air cylinder, the air compressor has to be detached from the machine and the compressed air supply
has to be cut off. Existing residual air pressure after disconnecting the air compressor from the
machine has to be expelled.
Exceptions to this are only adjustments and performance checks done by appropriately trained
technicians or special skilled personnel.

14. Periodically clean the machine throughout the period of use.

15. Grounding the machine is always necessary for the normal operation of the machine. The machine has
to be operated in an environment that is free from strong noise sources such as high-frequency welder.

16. An appropriate power plug has to be attached to the machine by electric technicians. Power plug has to
be connected to a grounded receptacle.

17. The machine is only allowed to be used for the purpose intended. Other used are not allowed.

18. Remodel or modify the machine in accordance with the safety rules/standards while taking all the effective safety
measures. We assume no responsibility for damage caused by remodeling or modification of the machine.

19. Warning hints are marked with the two shown symbols

Danger of injury to operator or service staff

Items requiring special attention

I

FOR SAFE OPERATION

1.Don't put your hand under the needle when you turn "on" the power switch or operate
the machine.

2.Don't put your hand into the thread take-up cover while the machine is running.

3.Turn OFF the power switch before tilting the machine head or removing the belt cover
and the V belt.

4.Never bring your fingers, hair or clothing close to, or place anything on the handwheel,
V-belt, bobbin winder wheel or motor during operation.

5.If your machine is provided with a belt cover, finger guard and safety plate, never
operate your machine with any of them removed.

6.The hook rotates at a high speed while the machine is in operation. To prevent possible
injury to hands, be sure to keep your hands away from the vicinity of the hook during
operation. In addition, be sure to turn OFF the power to the machine when replacing
the bobbin.

7.When tilting the machine head, exercise care not to allow your fingers etc. to be caught
under the machine head.

8.Do not wipe the surface of the machine head with lacquer thinner.

9.Never operate the machine unless its oil pan has been filled with oil.

10.Don't use a motor pulley of a larger outside diameter than the standard outside diameter
for the first onemonth.

11. Confirm that the voltage and phase (single- or 3-phase) are correct by checking them
against the ratings shown on the motor nameplate.

12,In case of maintenance, inspection, or repair, be sure to turn OFF the power switch
and confirm that the sewing machine and the motor have completely stopped before
starting the work. (In case of the clutch motor, it continues rotating for a while by the
inertia even after turning OFF the power switch. So, be careful.)

CAUTION BEFORE OPERATION

WARNING:

To avoid malfunction and damage of the machine, confirm the following.

Clean the sewing machine thoroughly before using it for the first time.
Remove all dust collected on the sewing machine during the transportation.
Confirm that the voltage and phase are correct.
Confirm that the power plug is properly connected.
Never use the sewing machine in the state where the voltage type is different from the
designated one.
The direction of rotation of the sewing machine is counterclockwise as observed from
the handwheel side. Be careful not to rotate it in reverse direction.

II

1. SPECIFICATIONS

251-140042 251-140042 A 251-140042 H

Application

Sewing speed Max. 5,000 rpm Max. 4,000 rpm Max. 4,000 rpm

Stitch length Max. 4 mm Max. 4 mm Max. 5 mm

Needle

Presser foot lift (by knee lifter)

Lubricating oil 10 White Oil

For medium-weight materials For light-weight materials For heavy-weight materials

DBx1#9to#18

10 mm (Standard)13 mm (Max.) 9 mm (Max.)

Noise

2. INSTALLATION

WARNING:

To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine
and check to be sure that the motor has totally stopped rotating in prior.

1 Installing the oil pan

DAx1#9to#11

Workplace-related noise at sewing speed n 4,000min : Lpa 83dB(A)
Noise measurement according to DIN 45635-48-A-1.

DBx1#20to#23

10 mm (Standard) 13 mm (Max.)

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The Oil pan should rest on the four corners of the
machine table groove.

2 Installing the machine

Fix the hinge by screw on the base platefix
the hinge hoider in the table slet by screw ,
Put the machinehead on the rubber seat .

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3

Fix the rubber seats of the front side to the
protruded side of the table by round nail ,
then using round nail to fix rubber seats of
the hinge side. then place the oil pan .

B4

1

A2

23

Keep horizontal level when installing the
machine head.

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