Contents page:
Preface and general safety instructions
Part 1: Operat ing Manual, Class 76 8
1. Product description
2. Designated use
3. Subclasses
4. Ancillary equipment
5. Technical data
6. Operation
6.1 Threading the needle thread . . . . . . . . . . . . . . . . . . . . . . . . 9
6.2 Adjusting the need le-thread tension . . . . . . . . . . . . . . . . . . . 9
6.3 Opening the needle-thread t ensioners . . . . . . . . . . . . . . . . . . 9
6.4 Adjusting the thread regulator . . . . . . . . . . . . . . . . . . . . . . . 10
6.5 Winding on the looper th read . . . . . . . . . . . . . . . . . . . . . . . 11
6.6 Fitting the looper-thread b obbin . . . . . . . . . . . . . . . . . . . . . . 12
6.7 Adjusting the looper-t hread ten sio n . . . . . . . . . . . . . . . . . . . . 13
6.8 Fitting and changing the needle . . . . . . . . . . . . . . . . . . . . . . 14
6.9 Raising the sewing feet . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1 0 Loc king the se wing feet in the up positi on . . . . . . . . . . . . . . . . 15
6.11 Adjusting the sewing-foot s troke . . . . . . . . . . . . . . . . . . . . . 16
6.11.1 Adjusting the sewing-foot s troke mechanically . . . . . . . . . . . . . . 16
6.11.2 Rapid el ectro-pneumatic stroke adjustmen t (HP) . . . . . . . . . . . . 17
6.12 Adjust ing the sewing-foot pressure . . . . . . . . . . . . . . . . . . . . 18
6.1 3 Adjusting the stitch length . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
GB
7. Keypad on sewing-machine arm
7.1 Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.2 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Ausg./Edition: 07/99
. . . . . . . . . . . . . . . . . . . . 19
Contents page:
8. Control and operating panel
8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.2 Operati ng-panel keys . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.3 Operati ng the V810 control u nit . . . . . . . . . . . . . . . . . . . . . 22
8.4 Changing parameter values . . . . . . . . . . . . . . . . . . . . . . . 23
8.5 Direct par ameter-number selection . . . . . . . . . . . . . . . . . . . 23
9. Sewing
10. Maintenance
10. 1 Cleaning and inspectio n . . . . . . . . . . . . . . . . . . . . . . . . . 26
10.2 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
11. Ancillary equipment
11.1 Seam-ce ntre guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
. . . . . . . . . . . . . . . . . . . . . . . . . . . 30
. . . . . . . . . . . . . . . . . . . . . . 20
1. Product description
The
DÜRKOPP ADLER 768
Two-needle double-lockstitch pillar sewing machine with underfeed, needle feed
•
and alternat i ng-foot overfeed
Robust design based on the pro ven modular system of the class 767.
•
Low-maintenance design (maintenance-free antifriction and s i ntering bearings ,
•
articulated thread lever with permanently-lubricated roller bearings)
Automatic non-pressurised recirculating lubrication with sight glasses for oil level
•
and circulation. Shuttle lubrication must be carried out manually.
Maximum space beneath raised sewing feet: 16 mm.
•
Stroke of alternating sewing feet adjustable by adjusting wheel on arm up to a
•
maximum of 7 mm.
Large vertical shuttle with bobbin-housing li f t.
•
A safety coupling on t h e lower toothed- belt wheel protect s the shuttle from being
•
displaced or damaged if the thread jams in the shuttle track.
Fitted as standard with pedal-operated electro-pneumatic sewing-foot lift.
•
Fitted as standard with electro-pneumatic rapid stroke-adjustment with automatic
•
stitch rat e l i mit, operated by knee switch or ergonomically-placed key on the
sewing-machi ne arm.
Automatic, infinitely-variable adjustment of stitch rates as a function of the stroke
height set.
is a special sewing machine with universal applications.
2. Designated use
The
material is generally made of textile fibres, but it may also be leather. It is used in the
clothing industry and for domestic and motor-vehicle upholstery.
This sewing machine can also be used to produce so-called technical seams. In this
case, however, the operator must assess the possible dangers which may arise (with
which
the one hand relatively unusual and, on the other, they are so varied that no single set
of criteria can cover them all. The outcome of this assessment may require appropriate
safety measures to be taken.
Generally only dry material may be sewn with this m achine. The materi al m ay be no
thicker than 10 mm when compres sed by the lowered s ewing feet. The mat erial may not
contain any hard objects, sinc e i f it does the machi n e may not be operat ed without an
eye-protection device. No such device is currently availab l e.
The seam is generally produced with textile-fibre sewing thread of gauge 10/3 NeB
(cotton), 10/3 Nm (synthetic) or 10/4 Nm (coveri n g yarn). Before us i ng any other thre ad
the possible dangers arising must be assessed and appropriate saf ety measures take n
if necessary.
This special sewing machine may be set up and operated only in dry, well-maintained
premises. If t h e sewing machine i s used in other premi ses which are not d ry and
well-maintained it may be necessary to take further precautions (which should be
agreed in advance - see EN 60204-3-1: 1990).
As manufactu rers of industrial sewing machines we proceed on the ass umption 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.
is a special sewing machine designed for sew i ng heavy material . Such
768
DÜRKOPP ADLER AG
would be happy to assist), since such applications are on
GB
5
3. Subclasses
Class 768-274-FLP-HP:
Two-needle double-lockstitch pillar sewing machine with
underfeed, needle feed and alt ernating-foot overfeed
4. Ancillary equipment
order no. ancillary equipment
9822 510125 light-guide sewing lamp
9880 767001 sewing-lamp fitting set
9822 510001 WALDMANN sewing lamp (halogen)
0907 487519 sewing-lamp fitting set
0798 500088 230V sewing-light transformer
9781 000002 WE-6 filter controller
0797 003031 pneumatic connection set
No.depending tape guide
on tape width
with mains cable and rocker switch, for fitting to the
sewing-machine arm
for light-guide sewing lamp 9822 510125
with 12V/20W bul b for fitting to the sewing-machine ar m
for sewing lamp 9822 510001
with mains cable, no switch,
for sewing lamps 9822 510001 and 9822510125
For the pneumat i c connection of fram es with maintenance units and
pneumatic ancillary equipment. Consists of connection hose
(length 5 m, diameter 9 mm), hose nozzles, hose ties and
plug-and-socket connector.
with tape-roll holder
N800 005611 seam-centre guide
5. T e chnical dat a
Noise:
Lc = 85 dB (A)
stitch length: 9,6 mm
sewing-foot stroke: 1,5 mm
stitch rate: 1.400 min
material: 4-play Skai, 1,6 mm 900 g/m
Lc = 86 dB (A)
stitch length: 9,6
sewing-foot stroke: 5,6 mm
stitch rate: 1.400 min
material: 4-play Skai, 1,6 mm 900 g/m
6
workplace emission value (DIN 45635-48-A-1-KL2)
-1
-1
2
2
needle system: 134-35
needle thickne ss (depending on E No.):
- min. [Nm] 140
- max. [Nm] 200
- standard [Nm] 180
needle gap (depending on E No.):
- min. [mm] 8
- max. [mm] 14
max. sewing-thread thicknesses:
- cotton [NeB] 10/3
- synthetic thread [Nm] 10/3
- covering yarn [Nm] 10/3
bobbin capacit y:
- synthetic thread Nm 20/3: [m] approx. 22
- synthetic thread Nm 30/3: [m] approx. 35
max. stitch rate: [rpm] 2400
max. stitch length:
- forwards: [mm] 12
- backwards: [mm] 12
max. material thickness: [mm] 10
stroke height alternating sewing feet:
- max. [mm] 7
- ex works [mm] 1 - 6
feed stroke (above needle plate): [mm] 1.2
max. passage beneath sewing feet:
- lift [mm] 16
GB
operating pre ssure: [bar] 6
air consumpti on per working cycle (FLP and HP): [NL] approx. 0.2
sewing drive: [type] Efka DC1600/DA82GA
rated power: [kW] 0.75
rated voltage: 1 x 230 V, 50 / 60 Hz
frames: [type] MG55-3
dimensions (H x W x D): [mm] 1570 x 1060 x 600
working height (ex works): [mm] 950
weight:
- sewing-machine upper part [kg] approx. 56
- frames with sewing drive [kg] approx. 46
7
1
2
3
Fig. a:
Fig. b:
Fig. c:
8
correct thread loop in the cen tre of
the material
needle-threa d tension too low
or looper-thr ead tension too great
needle-threa d tension too great
or looper-thr ead tension too low
6. Operation
6.1 Threading the needle thread
Caution - danger of injury !
Turn off the main switch!
The needle thread may only be th readed with the se wing
machine switched off.
–
Thread the needle thread as shown in the illustration.
6.2 Adjusting the needle-thread tension
Pre-tensioners 1
The pre-tensio ners 1 should be set at a lower tension than the main tensione rs 3.
–
Adjust the pre-tensioners 1 by turning the knurled nuts.
–
After making m ajor changes to the pre-tensione rs 1, readjust the m ain tensioners 3 .
Main tensioners 3
The main tensioners 3 should be set to the minimum possible tension.
The looping of the threads must be in the centre of the material (see fig. a).
With thin material excessive thread tension can cause unwanted gathering a nd thread
breakage.
–
Adjust the main tensioner 2 so that the stitches are uniform.
GB
Supplementary tensioner 2
The supplementary tensioner 2 can be switched in to effect a rapid change in
needle-thread tension durin g operation (e.g. with thickened se ams, on the flap when
backstitching the front edge of a jacket or overcoat).
–
Set the supplementary tensioner 2 lower than the main tensioner.
–
The supplementary tensioner 2 i s s wi tched on during operation at the keypad on
the sewing-machine arm.
When the supplementary tensioner is switched on the LED over the r elevant key
lights up.
6.3 Opening the needle-thread tensioners
The main tensioners 3 and supplementary tensioner 2, if it is switched on, open
automatically:
–
when the sewing feet are lift ed electro-pneum atically (see section 6.9).
9
6.4 Adjusting the thread regulator
1
2
The thread regulator 1 regulates the amount o f needle thread necessary for stit ch
formation.
The setting depends on the following factors: - material thickness
A properly-adjusted thread regulator ensures an ideal sewing result at a minimum
needle-thread tension.
At the correct setting the ne edle-thread loop must slide at low t ension over the th i ck e st
point of the shuttle.
Caution - danger of injury!
Turn off the main switch.
The thread regulator may only be adjusted with t he sewing
machine switched off.
–
Undo both screws 2.
–
Move the thread regulator 1.
The thread regulator is fitted with slots for this purpose.
Moving in the
Moving in the
–
Tighten screws 2.
direction increases the quantity of needle thread
"+"
direction reduces the quantity of needle thread
"-"
-
+
- yarn characteristics
- stitch length
10
6.5 Winding on the looper thread
1 2
B
C
E
3
Caution - danger of injury !
Turn off the main switch.
The looper thread may be threaded for spooling only with
the sewing machine switched off.
The looper thread may be spooled only with the sewing
feet locked in the raised position.
–
If spooling i s t o take place when s ewing with no unde rl aid material:
lock the sewing feet in the raised position (see section 6.9).
–
Thread the looper thread as shown in the illustration.
–
Wind about 5 lo ops of the looper t hread anti-clockwise onto the bob bin core.
–
Place the bobbin on bobbin-winder shaft 2.
–
Swivel bobbin-winder lever 3 ag ai nst the bobbin.
–
Adjust tension 1.
The looper thr ead should be wound on with minimal tens i on.
–
Sew.
The bobbin-wi nder lever 3 terminat es the process as soon as the bobbin is full .
GB
11
6.6 Fitting the looper-thread bobbin
1 2 3
Caution - danger of injury!
Turn off the main switch.
The looper-thread bobbin may onl y be changed with the sewing machine switched off.
4
2 5 6 7
Removing the empty looper-thread bobbin
–
Raise the sewi ng foot.
–
Open shuttl e cover 3.
–
Raise bobbin-housing flap 1.
–
Remove upper part of bobbin-housing 2.
–
Remove empty looper-thread bobbin.
Threading looper thread
–
Place full bobbin 4 in the upper pa rt of bobbin-housi ng 2:
When the thre ad is unwound the bobbin must rotat e
(see arrow).
–
Draw looper t hread through sli t 5 beneath tensioning spring 6.
–
Thread looper thread through hole 7 in the upper part of bobbin-housing 2.
–
Trim looper thread to approx. 3 cm.
–
Insert upper part of bobbin-housing 2 with full bo bbin into the shutt l e.
–
Close bobbin-housing flap 1.
–
Close shuttle cover 3.
12
in the opposite direction
6.7 Adjusting the looper-thread tensio n
1
2 3
3 2
Caution - danger of injury!
Turn off the main switch.
The looper-thread tension may only be adjusted with the sewing machi ne switched off.
Adjusting the tensioning spring 2
–
Open the shuttle cover.
–
Adjust the tensioning spring 2 with regulating screw 3.
to increase looper-thread tension = turn screw 3 clockwise
to decrease looper-thread tension = turn screw 3 anti-c l ockwise
–
Close shuttle cover.
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13
6.8 Fitting and changing the needle
1
2
3
4
Caution - danger of injury!
Turn off the main switch.
Needles may only be changed wi th the sewing machine
switched off.
–
Turn the handwheel until the needle rod 1 has reached its hi ghest point.
–
Undo screw 3.
–
Withdraw need l e downwards from needle holder 2.
–
Insert new needle as far as it will go into the hole in needle holder 2.
Caution:
When seen from the operating side of the machine the furrow 4 of the right-hand
needle must point to the right and the furrow of the left-hand needle to the left
(see sketch).
–
Tighten screw 3.
CAUTION:
When a thicker needle is fitted the distance from the
shuttle to the needle must be corrected
(see servicing instructions).
Failure to comply with this instruction can cause the following faults:
when fitting a thinner needle: -faulty stitches
when fitting a thicker needle: -damage to the shuttle tip
-damage to thread
-damage to the needle
14
6.9 Raising the sewing feet
The
class 768
(FLP) as standard. This enables the sewing feet to be raised during sewing.
–
Push pedal half-way back.
–
The sewing machine halts in the 1st position (needles down).
Raising the sewing feet.
–
Release pedal.
–
Push pedal forwards.
The sewing machine begins sewing at the rate set by the pedal.
pillar sewing machine is fitted with the electro-pneumatic sewing-foot lift
6.10 Locking the sewing feet in t he up p osition
1
GB
The electro-pn eumatically raised sewing feet are locked in the up position wi t h the
lever 1 (e.g. to spool the looper thread or change the sewing feet).
The lever 1 is located at the rear of t he sewing-machine arm.
–
With the mach i ne at a halt push t he pedal half-way back.
Raising the sewing feet.
–
Swivel lever 1 down.
The sewing fee t are locked in the up p osition.
–
Swivel lever 1 up.
The sewing feet are no longer locked.
15
6.11 Adjusting the sewing-foot stroke
1
B
C
E
6.11.1 Adjusting the sewing-foot stroke mechanically
The height of the sewing-foo t stroke is adjusted with adjusting wheel 1 on the arm c over.
Caution - danger of injury
The sewing-foot stroke may only be adjusted with
the sewing machine switched off.
–
Turn adjusting wheel 1. min.,
A, B, C, D, E, F, max.
min. = minimum sewing-foot stroke
max. = maximum sewing-foot stroke
Automatic stitch rate limit
The sewing-fo ot stroke and stitch rate are mutually dependent (see tabl e).
A potentiometer is mechanically connected to adjusting wheel 1. The control system
registers the set sewing-foot stroke via this potentiometer and limits the stitch rate.
stitch-length range adjusting cam sewing-foot max. stitch rate
[mm] [position] stroke [mm] [rpm ]
2400
1600
0 - 8
min.
A
B
C
D
E
F
max.
1.5 2350
2.4 2200
3.3 2050
4.2 1950
5.1 1750
6.0 1650
8 - 12 min. - max. 1600
16
6.11.2 Rapid electro-pneumatic stroke adjustment (HP)
2
1
The
class 768
adjustment (HP) as standard.
Maximum sewing-foot stroke can be activated while sewing for additional thicknesses in
the material or to oversew cross-seams as follows:
–
Press keypad key 1 on the sewing-machine arm.
OR:
–
Operate knee-switch 2 beneath the table plate.
Rapid stroke adjustment: operating mode
How long maximum sewing-foot stroke remains active depends on which operating
mode has been set. Three operatin g m odes are available.
They are set with parameters F-138 and F-184 on the operating panel
(see motor-m anufacturer’s guide (supplied)).
Operating
mode
Press and
hold
F-138 = off
F-184 = 0
Press and
release
F-138 = on
Press and
hold with
minimum
stitch rate
F-138 = off
F-184 > 0
pillar sewing machine is fitted with rapid electro-pneumatic stroke
Operation / Explanation
Maximum sewing-foot stroke remains active for as long as key 1
or knee-switch 2 is pressed.
Maximum se wi ng-foot strok e i s activated by pressing key 1 or
knee-switch 2.
Pressing the key or knee-switch again deactivates maximum
sewing-foot stroke again.
Maximum sewing-foot stroke remains active for as long as key 1
or knee-switch 2 is pressed.
After the key or knee-switch is released the machine continues
sewing unti l t h e pre-set minimum stitch rate (par ameter F-184) is
reached with maximum sewing-foot stroke. The seam is then
continued at normal sewing-foot stroke.
GB
17
6.12 Adjusting the sewing-foot pressure
B
E
C
1
The sewing-fo ot pressure is adjusted with knob 1.
–
to increase sewing-foot pressure = turn knob 1 clockwise
to decrease sewing-foot pressure = turn knob 1 anti-clockwise
2
3
6.13 Adjusting the stitch length
The stitch length is adjusted with knob 2.
–
to increase stitch length = turn knob 2 clockwise
to decrease stitch length = turn knob 2 anti-clockwise
–
To sew bar-tacks manually press stitch-regulating lever 3 down.
The machine sews backwards for as long as the stitch-regulating lever 3 is held
down.
The stitch length is the same as that set for sewing forwards.
See also section 8.
NB:
With stitch le ngths over 8 mm the speed of rotation of t he sewing drive is aut omatically
reduced.
This is to avoid overloading the stitch-setting transmission.
18
7. Keypad on the sewing-machine arm
1 2 3 4
5 6 7 8
7.1 Keys
key function
5 position needle in up or down position (stitc h by stitch)
6 activate maximum sewing-foot stroke
7 switch add i tional thread tension on/off
8 switch seam-centre guide stop on/off
GB
7.2 LED
LED display
1 maximum sewing-foot stroke activated
2 sewing dri ve switched on
3 additional thread tension switched on
4 switch seam-centre guide stop switched on
19
8. Control and operating panel
CAUTION!
This manual covers
ter changes available to the operator.
For a more detailed description of the control system please consult the motor-manufacturer’s current operating manual (supplied).
8.1 General
The operating panel is used to program the control unit and to set seam functions.
Depending on t he nature of the job, sewing may be exec uted manually or by seam
programming.
For differing jobs seams can be programmed for which the functions (starting bar tack,
ending bar tack, stitch count, thread cutting etc.) and parameter values
(stitch rate, seam length, r p m etc.) are individually assigned.
Entry is carried out in programming mode.
The parameters and the values assigned are displayed.
The seam programs are not lost even when the sewing machine is switched off
(battery buffer).
In order to avoid the inadvertent alteration of pre-set functions, operation is divided into
various levels (operator, technician, fitter).
The operator (seamstress) can program directly.
On the other levels access is contingent on the entry of a code number (EFKA).
those key functions and parame-
only
RESET
If the control unit is hopelessly misadjusted, this function allows the technician to reset
all adjusted values to their default (ex-works) settings.
This function is described in the Servicing instructions!
20
8.2 Operating-panel keys
CD E F
12 3 4AB
key function settings
P
E
+
-
1*
2*
3
4
A*
B
* key function vacant on this machine class
start or end p rogramming mode
confirm a parameter-value change
increase a displayed param e ter value
decrease a displayed parameter value
starting bar tack or starting-stitch compression SINGLE / DOUBLE / O FF
ending bar tack or ending-stitch compression SINGLE / DOUBLE / OFF
auto foot lift on stop in mid-seam ON / OFF
auto foot lift after thread cut-off ON / OFF
basic needle position (UT/OT) POSITION 1/POSITION 2
key for bar-tack suppression or activation
key for need l e up/down or shift-key
in programmi ng mode
GB
21
Symbol function
C
D
E
F
automatic rotation speed active
light barrier switched on
machine running
limited rotation speed active
8.3 Operating the V810 control unit
Functions can be switched on an d off by pressing the number keys and certain and
symbol keys on the control panel.
key 3: auto foot lift
auto foot l i ft on stop in mid- seam on: right arrow over key 3 on.
auto foot lift on stop in mid-seam off: right arrow off.
auto foot lift after thread cut-off on: left arrow over key 3 on.
auto foot lift after thread cut-off off: left arrow off.
key 4: basic needle position
basic needle position UT: left arrow over key 4 on.
basic needle position OT: left arrow off.
22
8.4 Changing parameter values
CAUTION!
After changing parameters it is essential to carry out a sewing run. Only then is the altered setting properly saved. If
sewing does not take place, the new setting is lost when
the main switch is turned off.
Parameters are changed and switched on and off with the
the operatin g panel.
The parameters which can be changed at operator level are listed below.
1. Switch on mains.
2. Start programming mode
–
Press the
The last parameter to have been called appears. If no parameter has been called
since the main switch was turned on,
3. Select required parameter
–
Press the
display. If the
cycles until the key is released.
–
Pressing the
4. Change displayed parameters
–
Press the
function on and off.
5. Save change parameter values
–
Press the
The changed parameter value is saved. The next operator-level parameter
appears in the display.
or:
–
Press the
The last parameter value to have been changed is saved.
The control system leaves programming mode.
–
Commencing sewing saves the new values, which are thus preserved when the
machine is switched off.
key.
"P"
"F - 000"
or
"+"
"+"
"E"
"P"
key repeatedly until the required parameter appears in the
"-"
or
"+"
"E"
or
key to change further param eter values.
key to leave programming mode.
key is held down, the parameter number automatically
"-"
key displays the paramet er value.
keys to change the value of the parameter or switch its
"-"
"P", "E", "+"
appears in the display.
and
"-"
keys on
GB
8.5 Direct parameter-number selection
The paramete r number can also be selected direct l y:
–
When a paramet er number is displ ayed, press the
The first character flashes.
–
Move to the next character by pressing the
"+"
or
">>"
"-"
key.
keys.
23
9. Sewing
The description of the sewing process is based on the following assumption :
–
The machine in question is a special sewing machine of sub-class
768-274-FLP-HP
–
The following functions are set on the operating panel:
stitch counting: OFF
basic needle p os i tion: DOWN (position 1)
auto sewing-foot lift on stop in mid-seam: OFF
starting bar-tack: OFF
ending bar-ta ck: OFF
thread cut ter THREAD CUTTER +
–
Main switch on.
Operating and function sequence for sewing:
Sewing process Operation / Explanation
Before starting to sew
Initial position
Position the material
at the start of the seam
.
RETURN
- Pedal in rest position.
Sewing machine at a standstill.
Needle up. Sewing feet down.
- Push pedal half-way back.
The sewing feet rise.
- Press material against the needles.
Sewing
In mid-seam
Interrupting the sewing process
Continuing the sewing process
(after releasing the pedal)
24
- Push pedal forwards and hold it there.
The machine sews at the speed determined
by the pedal.
- Release pedal (rest posit i on).
The machine halts in the 1st position
(needle down ).
The sewing feet are down.
- Push the pedal forwards.
The machine sews at the speed determined
by the pedal.
B
E
C
1
2
Sewing intermediate bar-tacks - Press stitch-re g ulating lever 1 downwards.
The machine sews backwards f or as long as
the stitch-regulating lever is held down.
Speed is determined by the pedal.
- Press key 2 or operate the knee-switch.
Oversewing a cross-seam.
(maximum sewing-foot stroke)
Maximum sewing-foot stroke is activated.
The rotation speed is limited to 1 600 rpm.
- Maximum sewing-foot stroke operating modes:
a) Press and hold
Hold key or knee-switch pressed for as
long as maximum sewing-foot stroke is to
remain active.
b) Press and release
Briefly press key or knee-switch to activate
maximum sewing-foot stroke.
Press it again to deactivate it.
At the seam end
remove material
- Push pedal fully back and hold.
The machine ha l ts in the 2nd positi on.
The needles are up.
The sewing feet rise.
- Remove material.
do
lift sewing feet
not
- Briefly pus h pedal fully forwar ds and release.
The machine ha l ts in the 2nd positi on.
The needles are up.
The sewing feet remain lowered.
GB
25
10. Maintenance
Caution - danger of injury!
Turn off the main switch!
Maintenance may only be carried out with t he sewing
machine switched off.
Maintenance work must be carried out no less frequently than at the intervals given in
the tables ( see "operating ho urs" column).
Maintenanc e i ntervals may nee d to be shorter when processing heavy-shedding
materials.
10.1 Cleaning and inspection
A clean sewing machine i s a trouble-free sewing machine!
3
1
26
2
6
4
8
2
10
4
5
6
7
maintenance work explanation operating
to be carried out hours
Upper part of machine
- Rem ove lint, pieces of
thread and o t her debris.
Places in specia l need of cleaning:
- area under the needle plate
- feeders
- area around the shuttle 2
- upper part of bobbin housing 3
- inner surface of shuttle cover
- needl e-thread tensioners
8
- Clean oil collector.
Sewing drive
- Check the condition and
tension of the V-belt.
Compressed-air
maintenance unit
(ancillary equipment)
- Check the water level
in the pressure regulator.
Clean the fil ter insert.
- Remove lint and oil spills with a cloth
It must be p ossible to depress t he V-belt
by about 10 mm by pressing it with a
finger at its mid-point.
The water leve l must not rise as high as
the filter insert 5.
- After screwing in the drain screw 7
blast water under pressure out of the
water separator 6.
NB:
The water separator 6 is fitted with
semi-automatic condensation drainage.
When the pres sure falls below a c ertain
level the condensation is automatically
drained.
Dirt and condensation are separated out
by the filter insert 5.
- Disconnect the machine from the
compressed-air supply.
- Screw in drain screw 7.
There must be no pressure in the
machine’s pneumatic system.
- Unscrew water separa t or 6.
- Unscrew filter insert 5
Wash the filter shell and insert
with cleaning fluid (
and blast clean.
- Re-assemble and connect the
maintenance unit.
not solvent
)
8
160
40
GB
500
27
1
B
E
C
2
3
28
4 5
10.2 Lubrication
Caution - danger of injury!
Oil can cause skin eruptions.
Avoid protracted contact with th e skin.
In the event o f contact, thorough l y wash the affected area.
CAUTION!
The handling an d disposal of minera l oi l s is subject to legal
regulation.
Deliver used oil to an authorised collection point.
Protect your environment.
Take care not to spill oil.
To lubricate the special sewing machine use only
or an equivalent oil of the follow i ng specification:
–
viscosity at 40° C : 10 m m2/s
–
flashpoint: 150 °C
ESSO SP-NK 1 0
following part numbers:
2-litre container: 9047 000013
5-litre container: 9047 000014
maintenance work explanation operating
to be carried out hours
- Lubricating the sewing
head and the lower part of
the sewing mac hi ne.
- Lubricating the shuttle. - Use the oil can (in the accessor y pack)
is available from
DÜRKOPP-ADL ER A G
Remove stopper 1.
- Top up with oil.
- Check the oil level at t he sight glass 3.
The oil level must always be above
the red
- Repl ace stopper 1.
- Remove any oil spillage from the oil
collector.
to drip a few drops of oil into hole 4 in
the shuttle-plunger ring 5
(there is no recirculation lubrication)
ESSO SP-NK 1 0
line.
"full"
retail outlets under the
lubricating oil
8
3
GB
- Inspecting the oil supply
to the sewing head.
- Inspect the oil supply
during operation
window 2.
- if no oil flow is visible at the viewing
window, inform the service technician.
at the viewing
8
29
11. Ancillary equipment
11.1 Seam-centre guide (only if 768-E2/... is present)
General
The seam-cent re guide provides guidance when backstit ching. The function of the
guide piece is to ensure that t here is an equal dis tance between the centre of the seam
and the left and right-hand needles.
Bearing pressure of seam-centre guide stop
CAUTION!
The seam-cent re guide pressure mus t not exceed a maximum of 2 bar!
–
To adjust the bearing pressure, pull ou t and rotate the pre ss ure-regulator handl e.
clockwise = to increase pressure
anti- clockwi se = to decrease pressure
30
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