Duerkopp Adler N291 User manual

Contents: Page:
Foreword and general safety instructions
Part 1: Operation manual Cl. N291
1. Product specifications
1.1 Use for the intended purpose . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Elements and their function
2.1 Elements at the machine head . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Elements at the machine stand . . . . . . . . . . . . . . . . . . . . . . . 10
3. Operation of the sewing machine
3.1 Threading the needle thread . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Winding the bobbin thread . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 Changing the bobbin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 Setting the bobbin thread tension . . . . . . . . . . . . . . . . . . . . . . 12
4. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Contents: Page:
Part 2: Installation manual Cl. N291
1. General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Assembling the machine stand . . . . . . . . . . . . . . . . . . . . . 6
3. Completing and screwing on the table top . . . . . . . . . . . . . . . 6
4. Connecting the sewing machine motor to the table top . . . . . . . 6
5. Mounting the machine head, positioning the V-belt and
fastening the pedal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. Fastening the handwheel and synchronizer . . . . . . . . . . . . . . 8
7. Connecting the maintenance unit . . . . . . . . . . . . . . . . . . . . 8
8. Laying and connecting the electrical cables . . . . . . . . . . . . . . 8
9. Filling in the oil and readying the machine for service . . . . . . . . 8
10. Making a sewing test and checking the oil supply of the
mist lubricator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
The following patents and registered designs apply:
Status September 1992
DE 84 33 111
DE 26 16 738
DE 28 03 971
DE 28 15 297
DE 30 43 141
DE 32 15 408
ES 428 674
ES 458 540
ES 477 288
GB 1 530 873
IT 209 238
IT 1 017 437
IT 1 077 155
IT 1 077 924
IT 1 109 783
IT 1 140 081
IT 1 160 800
IT 1 194 222
JP 61-61041
JP 1 803 181
JP 1 174 491
JP 1 250 838
JP 1 256 078
JP 1 258 920
JP 1 339 944
KR 24 686
SU 664 575
TW 19 105
TW 31 498
TW 33 691
TW 20 190
TW 23 626
US 4 116 145
US 4 137 858
US 4 364 319
US 4 446 803
US 4 457 244
US 4 534 304
US 4 646 668

1. Product specifications
1.1 Use for the intended purpose
The sewing unit must only be used for sewing textile fibres and leather.
1.2 Technical data
Needle system:
depending on sewing equipment: 2134-35 DUKK
134 KK
Maximum number of stitches:
depending on sewing foot stroke
and stitch length: 2000, 3000, 4000 1/min
Maximum stitch length
forward (v), reverse (r)
N291-164 062: 6 (v); 6 (r) mm
N291 185 082: 10 (v), 8 (r) mm
Maximum sewing foot stroke: 7 mm
Operating pressure: 6 +/-0.5 bar
Line pressure: 7-10 bar
Air consumption per work cycle: 0.15 NL
Maximum clearance under the
sewing feet:
When sewing: 10 mm
When feet are lifted in needle
up position: 17 mm
Maximum bobbin capacity:
with a thread size of Nm 80/2: 95 m
Maximum thread size:
Cotton: 11/3 NeB
Synth. continuous: 11/3 Nm
Corespun thread (poly- cotton): 11/4 Nm
5

2. Elements and their function
2.1 Elements at the machine head
Element function
Screw 1 – This screw for the sewing foot pressure is turned in
completely at the factory.
Therefore, do not change its adjustment!
Thread guide 2 – Depending on the material thickness, sewing thread
and stitch length, the position of the thread guide
must be adjusted such that controlled guiding of the
needle thread around the hook is assured.
When it is set at "0" the largest amount of thread is
released, as is required for very long stitches and
very thick material.
Turning knob 3 – Setting the additional tension engageable with lever
5 at the desired value.
Lever 4 – Opening the needle thread main tension and needle
thread additional tension.
Lever 5 – Activating and deactivating the additional tension.
To do this, unlock the lever by pulling it to the right,
and then change over.
Dial 6 – Set the "higher" foot stroke that has been activated
with the corresponding key or knee switch.
Dial 7 – Set the "smaller" foot stroke.
Sight glass 8 with
inlet opening – Indicating the oil level in the reservoir. The oil level must not drop below "MIN". If necessary, fill the oil
ESSO "SP NK 10" into the oil reservoir up to the
mark "MAX".
Turning knob 9 – Setting the reverse stitch length.
Turning knob 10 – Setting the forward stitch length.
Hand lever 11 – Changing the stitch length infinitely between the
adjusted forward and reverse stitch length.
Turning knob 12 – Setting the needle thread main tension at the
desired value.
Lever 13 – Determining whether the needle thread main tension
is opened or closed while the foot is lifted.
Lever up: Tension opened
Lever down: Tension closed
Needle 14 – When changing the needle, always turn off
the main switch.
Otherwise there is danger of injury!
Locking button 15 – Locking the sewing foot in its lifted position.
6

7

Element function
Sight glass 7 with inlet
opening 6 – Indicating the oil level in the reservoir for the hook lubrication.
The reservoir must never be empty.
– Tilt the machine head backwards and fill the oil
ESSO "SP NK 10" into the oil reservoir up to the
mark "MAX".
Control panel 5 – See the instruction manual of the motor
manufacturer.
Light-emitting diodes (LEDs)
1, 2, 3 and 4 – Indicating the maximum speed (number of stitches) depending on the foot stroke and stitch length:
Active. LEDs Maximum speed
1 2 3 4 4000 rpm*
2 3 4 3000 rpm*
3 4 2000 rpm
* Smaller speeds are possible by the use of smaller
pulleys or by inputting the respective values at the
control panel.
Key block 13
Key 17 – Activate "intermittent tacking" within the seam to be
sewn - as long as the key is activated.
Key 16 – Alternate the needle between its upper position (2nd
position) and bottom position (1st position).
Key 15 – Free for special functions.
Key 14 – Activating the higher foot stroke that has been set
with the relevant dial.
– The different operating modes may be found in the
description of the knee switch 1 (page 10) that
activates the same function.
Light-emitting diodes (LEDs)
at the key block 13
LED 10 – Indicating "Sewing machine motor enabled".
With enabled sewing machine motor, needle
change, bobbin change, threading and
other work within the motion range of
elements are not permitted.
Otherwise there is danger of injury!
LED 8 and 9 – Indicating "Bobbin empty except for remaining
thread". (Only on machines with bobbin thread
monitor)
LED 11 and 12 – Indicating when the keys 14 and 15 are operated.
8

9

2.2 Elements at the stand
Elements function
Main switch 2 – Turning on and off the machine.
Pedal 3
Idle position – No function.
Position "half back" – Lifting the foot at machine standstill.
Position "completely
back" – Activating the thread trimmer and lifting the foot.
Positions "in front" – Sewing at the desired speed.
Knee switch 1 – This key has the same function as the key 14
(page 9) of the key block:
Activating a higher foot stroke.
– The operating mode
"Activation as long as the key is being operated"
or
"Activation until the key is being re-operated"
or
"Activation as long as the key is being operated and
until all input stitches are sewn"
depends on the input at the control panel.
Maintenance unit
Air filter and water
separator 8 – Before the water level reaches the filter, turn in the drain screw 7 accordingly. While doing so, do not
interrupt the supply of compressed air.
Pressure regulator 9 – To adjust 6 bar pull up the sleeve 10 and turn it
accordingly.
Mist lubricator 6 – Adjust approx. 1 drop for 10 work cycles using the
set screw 4.
To refill, vent the pneumatic system, turn out the
screw 5 and refill the oil ESSO "SP NK 10" up to the
"groove".
10

11

3. Operating the sewing machine
3.1 Threading the needle
thread
–Turn off the main switch of the
machine.
Otherwise there is danger of injury!
–Thread the needle as shown in the
figure.
3.2 Winding the bobbin thread
–Slip the bobbin 4 onto the bobbin
winder 3.
–Pull the thread through the guide 1
and the tension assembly 2.
–Wind the thread clockwise approx. 5
times around the bobbin core and
tear off at the thread clamp 6.
–Press the bobbin winder lever 5 into
the bobbin.
–Sewing
The bobbin winder lever stops the
winding process, when the bobbin is
fully wound.
If the thread is not to be wound during
sewing, the foot must be locked in its
lifted position and the foot stroke must
be set at its smallest value.
3.3 Changing the bobbin
–Turn off main switch.
Otherwise there is danger of injury!
–Pull out the slide plate 7.
–Remove the bobbin case cap 8 with
the bobbin 11.
To do this, grasp under the nose 10 of
the bobbin case cap.
–Remove the bobbin.
–Install the fully wound bobbin such
that the bobbin turns in the direction
shown in the figure, when thread is
drawn.
–Pull the thread through the slot 16,
under the spring 14, through the slot
13, and from the inside to the outside
through the hole 12.
–Install the bobbin case cap with the
bobbin and close the latch 9.
–Push in the slide plate.
3.4 Setting the bobbin thread
tension
–Turn off the main switch of the
machine.
Otherwise there is danger of injury!
–Pull out the slide plate 7.
–Remove the bobbin case cap 8 with
the bobbin 11. To do this, grasp under
the nose 10 of the bobbin case cap.
–Turn the set screw 15 accordingly.
–Install the bobbin case cap with the
bobbin and close the latch 9.
–Push in the slide plate.
12

13

4. Maintenance
The maintenance work must have been carried out at the latest after the service hours
given in brackets [ ]. Other maintenance intervals may be required when special
materials are sewn.
Occurrence Remarks
Machine head
Removal of accumulated lint [8] –This applies in particular to the
following places:
Throat plate underside
Feed dog rows
Area around the hook
Brake spring 17 (page 13) in the
bobbin case cap.
Checking the oil level in the two
reservoirs 7 (page 9) and 8 (page 7) [40] –See subject 2.1
Maintenance unit
Cleaning the insert in the air filter 8 (page
11) [500] –Prior to this, vent the system.
Checking the oil level in the mist
lubricator 6 (page 11) [180] –The oil level must not drop below the
opening of the suction pipe.
Checking the oil supply of the mist
lubricator [180] –See subject 2.2
Checking the tightness of the pneumatic
system [500]
14