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Foreword and general safety instructions
Part 1: Operation manual Cl. N291
1. Product specifications
1.1 Use for t he intended purpose . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Technical da ta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Elements and their function
2.1 Element s at the machine he ad . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Element s at the machine stand . . . . . . . . . . . . . . . . . . . . . . . 10
3. Operation of the sewing machine
3.1 Threading the needle thr ead . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Winding the b obbin thread . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 Changing the bobbin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 Setting the bobb in 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 23 8
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 t extile fibres and leather.
1.2 T echnical data
Needle system:
depending on sewing equipmen t: 2134-35 DUKK
Maximum number of stitches:
depending on sewing foot stroke
and stitch le ngth: 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
134 KK
Operating pressure: 6
Line pressure: 7-10 bar
Air consumpti on per work cycle: 0.15 NL
Maximum clearance under the
sewing feet :
When sewing: 10 mm
When feet are l i f ted 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 th read (poly- cott on): 11/4 Nm
+
/-0.5 bar
5
2. Elements and their function
2.1 Elements at the machine head
Element function
Screw 1
Thread guide 2 – Depending on the material thickness, sewing thread
Turning knob 3 – Setting the add i tional tension engageable wit h l ever
Lever 4 – Op ening the needle t hread main tension and needle
Lever 5 – Activating and deactivating the additional tension.
Dial 6
Dial 7
Sight glass 8 wi th
inlet opening
Turning knob 9 – Setting the reverse stitch length.
Turning knob 10 – Setting the forward stitch len g t h.
Hand lever 11 – C hanging the stitch length inf initely betwee n the
Turning knob 12 – Setting the nee dl e thread main t ension at the
Lever 13 – Determining whether the needle thread main tension
Needle 14
Locking button 15 – Locking the sewing foot in its lifted position.
– This screw for the sewing foot pressure is turned in
completely at the factory.
Therefore, do not change its adjustment!
and stitch length, the position of the thread guide
must be adjus t ed such that co nt rolled guiding of the
needle thread around the hook i s assured.
When it is set at "0" the large st amount of thre ad is
released, as is required for very long stitches and
very thick material.
5 at the desired value.
thread additional tension.
To do this, unlock the lever by pulling it to the right,
and then chan ge over.
– Set the "higher" foot stroke that has been activated
with the corresponding key or knee switch.
– Set the "smaller" foot stroke.
– 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".
adjusted for ward and reverse stitch length.
desired va l u e.
is opened or closed while the foot is lifted.
Lever up: Tension opened
Lever down: Tension closed
– When changing the needle, always turn off
the main switch.
Otherwise there is danger of injury!
6
7
Element function
Sight glass 7 wi th inlet
opening 6
– Indicating the oil level in the reservoir for the hook
lubrication.
The reservoir must never be e mpty.
– Tilt the machine head backwards and fill the oil
ESSO "SP NK 10" into the oil reservoir up to the
mark "MAX".
Control pane l 5
– See the instructi on manual of t he motor
manufacturer.
Light-emitting diodes (LEDs)
1, 2, 3 and 4
– Indicating the m aximum speed ( number of stitc hes)
depending on the foot stroke and stitch length:
Active. LEDs Maxi mum 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 ac tivated.
Key 16 – Alternate the needle between its upper position (2
position) an d bottom positi on (1st position).
Key 15 – Free for special functions.
Key 14 – Act i vating the higher foot stroke t hat has been se t
with the relevant dial.
– The different op erating modes may be found in t he
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 mot or, needle
change, bobbin change, th reading and
other work wit hin the motion range of
elements are
not permitte d.
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 ar e operated.
nd
8
9
2.2 Elements at the stand
Elements function
Main switch 2 – Turning on and off the machine.
Pedal 3
Idle position
Position "half back"
Position "completely
back"
Positions "in front"
Knee switch 1 – This key has the same function as the key 14
Maintenance unit
Air filter and w ater
separator 8
Pressure regu l ator 9 – To adjust 6 bar pul l up the sleeve 1 0 and turn it
Mist lubricator 6 – Adjust approx. 1 drop for 10 work cycles using the
– No function.
– Lifting the foot at machine standstill.
– Activating the thread trimmer and lifting the foot.
– Sewing at the desired speed.
(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 th e i nput at the cont rol panel.
– 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.
accordingly.
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 tensi on assembly 2.
–
Wind the thread clockwise approx. 5
times around t he bobbin core and
tear off at the thread clamp 6.
–
Press the bobb i n winder lever 5 into
the bobbin.
–
Sewing
The bobbin wind er lever stops the
winding process, when the bobbin is
fully wound.
If the thread is not to be wound during
sewing, the foot
lifted position and the foot stroke must
be set at its smallest value.
must be locked in its
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 t hread is
drawn.
–
Pull the thread through the slot 16,
under the spr i ng 14, through the slot
13, and from t he 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 S etting 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]
Checking the oil level in the two
reservoirs 7 (page 9) and 8 (pag e 7) [40]
Maintenance unit
Cleaning th e i nsert in the ai r filter 8 (page
11) [500]
Checking the oil level in the mist
lubricator 6 (page 11) [180]
Checking the oi l supply of the mist
lubricator [180]
Checking the tightness of the pneumatic
system [500]
–
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.
–
See subject 2.1
–
Prior to this, vent the system.
–
The oil level must not drop below the
opening of th e suction pipe.
–
See subject 2.2
14
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