Duerkopp Adler 281 User manual

GB
中
文
281
特殊缝制设备
Instruction manual
操作说明书
Manufacturer: Dürkopp Adler Sewing Machine (Suzhou) Co., Ltd.
Wanping East Road, Wujiang, Suzhou, Jiangsu Province 215223, China
Contact: Dürkopp Adler AG, PO Box 17 03 51, D-33703 Bielefeld, Potsdamerstr. 190, D-33719 Bielefeld,
Phone [phone], Fax [phone], www.duerkopp-adler.com
制造商 : 杜克普爱华缝制设备 （苏州）有限公司
中国江苏省苏州市吴江市横扇镇菀坪东路 邮政编码：215223
联系单位 : Dürkopp Adler AG, PO Box 17 03 51, D-33703 Bielefeld, Potsdamerstr. 190, D-33719 Bielefeld,
Phone [phone], Fax [phone], www.duerkopp-adler.com
Ausgabe / Edition: Änderungsindex Teile-Nr./Part.-No.:
06/2011 Rev. index: 04.0 Printed in China 中国印制 0791 281741

All rights reserved.
Property of Dürkopp Adler and copyrighted. Reproduction or publication of the content in any manner, even in ex-
tracts, without prior written permission of Dürkopp Adler, is prohibited.
版权所有，不许翻印！
版权和产权归杜克普爱华有限公司所有。未经杜克普爱华有限公司书面许可，禁止以任何方式翻印或复印本内容，
包括摘要。
Copyright © Dürkopp Adler - 2011

GB
Contents Page
Part 1: Operating Instructions Class 281 - Original Instructions
(Edition 06/2011)
1 General Safety Instructions .......................................................................................................... 1
2 Product description ....................................................................................................................... 3
2.1 Product description.......................................................................................................................... 3
2.2 Designated use................................................................................................................................. 3
2.3 Technical Data Subclasses .............................................................................................................. 5
3Operation....................................................................................................................................... 7
3.1 Threading the needle thread ............................................................................................................ 7
3.2 Setting Needle Thread...................................................................................................................... 8
3.3 Loosening the needle thread tension .............................................................................................. 9
3.4 Winding on the hook thread ............................................................................................................ 10
3.4.1 Adjusting the bobbin wind-on quantity ........................................................................................... 11
3.5 Inserting the hook thread bobbin .................................................................................................... 12
3.6 Adjusting the hook thread tension ................................................................................................... 13
3.7 Changing the needle ........................................................................................................................ 14
3.8 Adjusting the thread regulator ......................................................................................................... 15
3.9 Adjusting the stitch length ............................................................................................................... 16
3.10 Adjusting the sewing foot pressure.................................................................................................. 16
3.11 Lifting the sewing foot ..................................................................................................................... 17
3.12 Locking the sewing foot in lifted position......................................................................................... 17
3.13 Push button on the machine arm .................................................................................................... 18
3.14 Operating panel DAC basic / classic ............................................................................................... 19
3.14.1 Keys and their functions on the operating panel ............................................................................. 19
3.15 Sewing ............................................................................................................................................. 20
4 Maintenance .................................................................................................................................. 23
4.1 Hook lubrication (only for subclasses with oil lubrication of the hook) ........................................... 24
4.2 Gear box lubrication ........................................................................................................................ 25

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.

GB
3
2 Product description
2.1 Product description
The DÜRKOPP ADLER 281 is a special sewing machine for universal use.
It is a single-needle double-lockstitch machine with bottom feed for light
to medium weight material and equipped with a standard sewing equip-
ment (E2) for general sewing operations on clothing.
Integrated sewing motor on the upper shaft.
Maximum sewing speed of 5,000 stitches/min (factory setting
4,800 stitches/min.)
Stitch length 4.5 mm.
Thread trimmer, automatic electromagnetic bartacking.
Electromagnetic thread clamp, to be switched on and off on the operating
panel.
Integrated drive lock for stopping the sewing drive while the machine head
is swivelled.
2.2 Designated use
The class 281 is a sewing machine head designed for the sewing of light to
medium weight material. This kind of material consists in general of textile fi-
bers or leather and is used in the clothing industry and for domestic and car
upholstery.
It exists also the possibility of executing so-called technical seams with this
sewing machine head. In this case the customer (DÜRKOPP ADLER would
be pleased to cooperate) has to evaluate the possible dangers, since these
kinds of applications are rather rare and their variety is immense. Depending
on the result of this risk evaluation appropriate safety precautions must pos-
sibly be taken.
Generally only dry material may be sewn with this sewing machine head.The
material must not contain hard objects, since otherwise the sewing machine
head could only be operated with an additional eye-protection device. Such
a device is currently not available.
The seam is generally effectuated with sewing thread consisting of textile fi-
bers with a gauge of up to 30/3 NeB (cotton threads), 30/2 Nm (synthetic
threads) or 30/3 Nm (covering thread).
If other threads are to be used, the resulting dangers must first be evaluated
and if necessary safety precautions must be taken
The sewing machine may be set up and operated only in dry and well-main-
tained premises. If the sewing machine is used in premises that are not dry
and well-maintained further precautions, which have to be negotiated before-
hand (see EN 60204-31: 1999) may become necessary.
As manufacturers of industrial sewing machines we expect that the personnel
operating our products has at least received sufficient training in order to ac-
quaint it with all regular operations and their possible dangers.

4
2.3 Subclasses
281-140342-01 Single-needle double-lockstitch machine with bottom
feed and electro-pneumatic sewing foot lifting.
Lubricated hook.
2.4 Optional Equipment
For the 281 the following optional equipment are available:
Order-No. Optional Equipment Subclass
281-140342-01
0281 590034 LED sewing lamp, on the sewing machine head X
N900 012015 Edge guide on the right side, 0 - 14 mm,
fixed on the bed plate, to be swivelled horizontally
X
N900 011038 Edge guide on the right side (immovable), 0 - 40 mm
fixed on the bed plate
X
N900 020021 Edge guide on the right side, 0 - 50 mm, swinging upwards,
fastened to the cloth presser bar bushing
X
N900 020023 Edge guide on the right and left side, 0 - 60 mm, swinging upwards,
fastened to the cloth presser bar bushing
X
N900 023421 Edge guide on the right side, 0 - 40 mm
with sewing foot lifting,
fastened to the cloth presser bar bushing
X
0204 001322 Articulated compensation foot for margin topstitching,
0.8 mm to the right of the needle
X
0204 001322A Articulated compensation foot for margin topstitching,
1.6 mm to the right of the needle
X

GB
5
2.5 Technical Data
Noise: Workplace-related emission value in accordance with DIN 45635-48-A-1-KL2
281-140342 LC = _dB (A)
Stitch length: _ mm Sewing foot stroke: __ mm Speed: ____ min -1
2.6 Technical Data Subclasses
Subclasses
281-140342-01
Type of stitch Lockstitch 301
Hook type Horizontal hook
lubricated
Number of needles 1
Needle system 134 / 797 / Dxp1
Dimension of the needle bar piston [mm] 2.0/ 1.62
Needle size [Nm] 65 - 120
Max. sewing thread [Nm] 30 / 3
Stitch length forward/ backward [mm] 4.5
Max. Speed [min-1]5,000
Speed at delivery [min-1]4,800
Sewing foot stroke max when lifted with the knee lever [mm] 14.5
Sewing foot stroke max when lifted with the solenoid [mm] 12
Sewing foot stroke at delivery [mm] 9
Weight [kg] 42
Rated voltage [V/Hz] 200 - 240V
50/60Hz
Rated voltage at delivery [V/Hz] 1 x 230V
50/60Hz
Rated output [kVA] 0.5
Dimension of package including machine head, kit, drive L =785, H = 694, B = 300 mm
Gross weight [kg] 54.5

6

GB
7
3 Operation
3.1 Threading the needle thread
–Put the thread reel on the thread stand.
–Release the tension 4.
Press the pin 6.
–Thread in the needle thread.
(see Sketch)
Needle thread longer
Needle thread shorter
Caution: Danger of injury!
Turn off the main switch!
The needle thread may only be threaded with the sewing machine switched
off.
Fig. 1 Fig. 2
4
5
1
3
2
6

8
3.2 Setting Needle Thread
Pretension
When the main tension 4 is open (Fig. 3) a slight residual tension is needed in
order to allow a controlled thread trimming. This residual tension is generated
by the pretension 1 (Fig. 3).
The pretension 1 (Fig. 3) also determines the length of the trimmed needle
thread end 5 (Fig. 4) (starting thread for the next seam).
–Basic setting:
Turn the setting wheel 2 (Fig. 3) until its front is flush with
bolt 3 (Fig.3).
–Shorter starting thread:
Turn the setting wheel 2 clockwise.
–Longer starting thread:
Turn the setting wheel 2 counter-clockwise.
Main tension
The main tension 4 should be set as low as possible.
The thread interlacing should be in the center of the material.
With lightweight material, an excessive thread tensions can result in
undesired ruffling and thread breakage.
–Set the main tension 4 so as to achieve a regular stitch pattern
(Fig. a).
To increase tension - turn the setting wheel clockwise
To decrease tension - turn the setting wheel counter-clockwise
Fig. a: Correct thread interlacing in the center of the material
Fig. b: Needle thread tension too weak
or
hook thread tension too strong
Fig. c: Needle thread tension too strong
or
hook thread tension too weak
Fig. 5
Fig. 3 Fig. 4
5
1
2
4

GB
9
3.3 Loosening the needle thread tension
Fig. 6
Automatic
The main tension 4 is automatically opened during thread trimming.
4

10
3.4 Winding on the hook thread
–Put the bobbin on the winder shaft 1.
–Thread in the hook thread according to the illustration.
–Wind the hook thread manually a few times clockwise around the
bobbin core.
–Pull the thread end through the tear off knife 3 and cut it.
–Turn the winder flap 2 until it butts against the bobbin.
–Turn on the main switch.
–Start the sewing procedure.
The winder will switch off automatically when the set bobbin wind-
on quantity (see service instructions) has been reached.
–Pull off the full bobbin, push the thread under the tear off knife 3
and tear it off.
Fig. 7 Fig. 8
ATTENTION Danger of breakage!
Lift the sewing foot with the hand lever and remove the bobbin case from the
hook when winding without sewing.
Fig. 9
1
23

GB
11
3.4.1 Adjusting the bobbin wind-on quantity
–Loosen screw 1.
–Adjust the winder blade 2.
–Tighten screw 1.
Fig. 10
More bobbin thread
Less bobbin thread
12

12
3.5 Inserting the hook thread bobbin
Removing the bobbin
–Raise up the flap 1.
–Remove bobbin case 2 with the bobbin 3.
–Remove the empty bobbin from the bobbin case 2.
Insert a full bobbin
–Insert a full bobbin 3 into the bobbin case 2.
–Pull the hook thread through the slot 4 underneath the tension
spring 6 into the bore 5.
–Pull about 5cm of hook thread out of the bobbin case 2.
–While pulling the thread, the bobbin should turn into the direction
indicated by the black arrow.
–Insert the bobbin case 2 back into the hook.
–Close the bobbin case flap 1.
Caution: Danger of injury!
Turn off the main switch.
The hook thread bobbin may only be inserted with the machine switched off.
Fig. 11 Fig. 12
1
3
5
6
3
2

GB
13
3.6 Adjusting the hook thread tension
Adjusting the hook thread tension
The hook thread tension should be set in a way that a correct thread
interlacing as shown in fig. a of chapter 3.2 is achieved.
–With a recommended hook thread tension measured with a full
bobbin of for example 25 g: 12,5 g should be covered by the brake
spring 1 and 12,5 g by the tension spring 3.
–The rule for the basic setting of the spring tension 3 is as follows:
The bobbin case with a full bobbin inserted should slowly sink
through its own weight (Fig. 12).
The brake spring 1 stops the bobbin's after-run during the thread
trimming procedure
In order to adjust the two tension values proceed as follows:
–Turn back the adjustment screw 2 so that the tension of the tension
spring 3 is completely released.
–Bend the brake spring 1 so that half of the recommended thread
tension value is produced by the brake spring.
–Insert the bobbin into the bobbin case body and thread in the hook
thread (see chapter 3.5)
–Insert the bobbin case with bobbin into the hook
–Keep the free thread end from the needle in one hand.
–Turn the hand wheel until the sewing machine has effectuated one
stitch.
–Pull the hook thread through the needle hole by using the needle
thread.
–Unwind the hook thread at 45° in sewing direction. About half of
the thread tension value should be perceptible.
–Then tighten the adjustment screw 2 after having attained the rec-
ommended tension value.
Caution: Danger of injury!
Turn off the main switch.
Adjust the hook thread tension only with the sewing machine
switched off.
Fig. 13 Fig. 14
1
2
3

14
3.7 Changing the needle
–Loosen screw 1 and remove the needle.
Push the new needle until the stop into the bore of the needle
bar 4.
–Tighten screw 1.
Ignoring the above mentioned adjustment can lead to the following problems:
–Change to a thinner needle: - Missed stitches
- Damage of the thread
–Change to a thicker needle: - Damage of the hook tip
- Damage of the needle
Caution: Danger of injury!
Turn off the main switch.
Change the needle only with the sewing machine switched off.
ATTENTION!
The needle scarf 2 must point to the hook tip 3
see (Fig. 16).
ATTENTION!
After changing to another needle size, the distance between hook and needle
must be readjusted (see the service instructions).
a
Fig. 15 Fig. 16 Fig. 17
2
3
2
3
1
4

GB
15
3.8 Adjusting the thread regulator
The thread regulator 1 regulates the amount of thread needed for the stitch
formation.
Only a correct thread regulator setting guarantees an optimal sewing result
The setting of the thread regulator depends on the following factors:
–Stitch length
–Material thickness
–Characteristics of the sewing thread used
With the correct setting the needle thread loop 3 should slide without surplus
and with low tension over the hook
–Loosen screws 2.
–Adjust the thread regulator 1.
–Tighten screws 2.
Caution: Danger of injury!
Turn off the main switch.
Adjust the thread regulator only with the sewing machine switched off.
Fig. 18 Fig. 19
+ -
1
2
3

16
3.9 Adjusting the stitch length
Fig. 20
–With the setting wheel 2 on the machine arm the stitch lengths for
forward and reverse sewing are set.
The stitch lengths for forward and reverse sewing are identical
–For the manual sewing of tacks press down the reverse feed
lever 1.
As long as the reverse feed lever 1 is pressed down, the machine
sews in reverse.
3.10 Adjusting the sewing foot pressure
Setting range: 10-80 N (10N=1kp)
Factory setting: 40 N (at 4800 St/min.)
Fig. 21 Fig. 22
1
2
1