Duerkopp Adler 271, 272, 273, 274, 275 Service Manual

Contents Page:

Part 3: Service manual, class 271 - 275

1. General

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2 Description and adjustment of the integral adjusting disc . . . . . . . . . . . . . . . . . . . . . 5

1.3 Positioning the integral adjusting disc with respect to the arm shaft . . . . . . . . . . . . . . . 6

2. Null point, feed with fitments

2.1 Null-point adjustment (position of stitch-length regulator) . . . . . . . . . . . . . . . . . . . . . 7

2.2 Feed halt when the stitch-length regulator (thrust cam) moves . . . . . . . . . . . . . . . . . . 8

2.3 Lift cam and feed-dog height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3.1 Eccentric bush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.4

Class 272/27 4:

synchronisation of needle feed and underfeed . . . . . . . . . . . . . . . . . 12

2.5

Class 272/27 4:

distance between needle bar and pressure bar . . . . . . . . . . . . . . . . . 13

2.6

Class 272/27 4:

aligning the feed dog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.7

Class 273/27 4:

roller overfeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.7.1 Synchronisation of underfeed and roller overfeed . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.7.2 Distance between feed roller and needle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.7.3 Feed-roller lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.7.4 Roller pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.7.5 Fabric deflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.7.6 Roller-overfeed belt tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.7.7 Replacing the feed roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3. Foot height and lift

3.1 Pressure-bar height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.2 Mechanical foot lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.3 Electromagnetic foot lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.4 Hinged foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.4.1 Compensating hinged foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4. Upper-thread tensioner release

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.1 Thread take-up spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5. Bobbin winder

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6. Needle-bar height

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7. Shuttle adjustments

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7.1 Loop lift and distance between shuttle beak and needle . . . . . . . . . . . . . . . . . . . . . . 31

7.2 Shuttle-drive housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7.3 Bobbin-housing holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Contents Page:

8. Thread clipper

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.1 Control cam for timing the blade movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.2 Positioning the fixed blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

8.3 Sharpening the fixed blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

8.4 Thread-guide plate, adjusting plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

8.5 Hooked blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

8.6 Cutting pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9. Class 271/272: thread retractor

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

10. Class 272: edge cutter

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

10.1 Replacing the sewing equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

10.2 Adjusting the indicator bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

10.3 Sharpening or replacing the blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

11. Class 271: cross-cutter

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

12. Class 275: differential foot overfeed

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

12.1 Adjusting the overfeed-foot travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

12.1.1 Synchronisation of overfeed foot and feed dog . . . . . . . . . . . . . . . . . . . . . . . . . . 51

12.2 Adjusting the overfeed-foot lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

12.2.1 Adjusting the overfeed-foot eccentric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

12.2.2 Adjusting the overfeed lift height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

12.2.3 Position of the overfeed foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

12.3 Adjustment of the extra-thickness operating lever . . . . . . . . . . . . . . . . . . . . . . . . 55

13. Replacing the arm-shaft bearing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

14. Lubrication

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

14.1 Oil circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

14.2 Shuttle lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

15. Control and operating panel

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

15.1 Control and QUICK operating panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

15.1.1 Changing settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

15.1.2 RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

15.2 Control and EFKA operating panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

15.2.1 Changing settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

15.2.2 RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

16. Maintenance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

17. Summary of all sewing-machine settings

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

IMPORTANT

The illustrations in this manual are of various classes or sub-classes
of the special sewing machine.

Please remember that your special sewing machine may differ from
the machine illustrated.

1. General

This service manual describes the adjustment of the special sewing
machine, classes

271 to 275

.

271

single-needle double-lockstitch machine
with skipp ing underfeed

272

single-needle double-lockstitch machine
with skipp ing underfeed and n ee dl e fe ed

273

single-needle double-lockstitch machine
with skipp ing underfeed and i n te r mittent roller ov e r fe ed

274

single-needle double-lockstitch machine
with skipp ing underfeed, nee dl e fe ed an d
intermittent roller overfeed.

275

single-needle double-lockstitch machine
with skipp ing underfeed and d i ffer en ti a l fo ot ov e rfe ed

IMPORTANT

The processe s de s c ri be d i n th i s ma nu al m ay o nl y b e c a r ri ed ou t b y
specialist personnel or persons with appropriate training.

Caution: danger of injury

Before all repair, conversion and maintenance work turn off the main
switch and isolate the machine from the pneumatic supply.

When carrying out adjustment work and function-testing with the
machine runni ng , c o mp l y wi t h a l l safety measures a nd ta k e t he utmost
care.

This service manual describes the adjustment of the sewing machine
in a logical o r de r. It must be b or n e i n mi n d t ha t v a r ious adjustment s
are mutually dependent. The adjustment process must therefore be
carried out in the order given.

For all adjustments of stit c h-forming components a flawles s n ew
needle must be fi t te d.

When adjusting cutting devices the tools must be replaced.

IMPORTANT

All colour-m ar k e d components are f ac t ory - se t. These settings sh ou l d
not be altered ex ce pt by speciali s ts.

3

1.1 Gauges

With the adj us t me nt ga ug es l i s t ed be l ow th e s e wi n g m ac h i ne can be
precisely ad jus t ed and tested.

item g auge order no. use

1

gauge 0216 001069 needle-bar height cla s s 27 1/ 27 3

2

gauge 0272 001240 needle-bar height cla s s 27 2/ 27 4

3

adjusting pi n 9301 022608 lock sewing ma c hi n e i n po s i tions A -

F

4

gauge 0271 000767 needle-bar height and shuttle-drive housing

with small shuttle ( 0271 000751 / 0271 001991 )

5

gauge 0271 000766 needle-bar height and shuttle-drive housing

with large shuttle ( 0271 00 10 21 / 0 27 1 0 02 041 )

6

gauge Z124 000443 adj u s ti n g e dg e c u tt er cl a s s 27 2

1 2 3

4 5 6

4

1.2 Description and adjustment of the integral adjusting disc

The sewing ma chi n e c a n b e l o c k ed i n a ll ad j us t me nt po s i ti o ns w i th
locking pin 3 and the integral adjusting disc 4 on the synchronous-belt
pulley of the arm shaft.

The adjusting disc has 6 notches which are marked on the handwheel
by the letters A, B, C, D, E and F. In conjunc ti o n w i th ma r ki ng 2 t he
letters indicate the position of the notches in which the machine can
be locked wi th pi n 3.

Notch A (loop-lift position) is deeper than the other notches.

The following items should be adjusted in the various positions:

A

adjusting disc with respect to the groove in the arm-shaft crank,
parallelism, belt wheel, loop lift, distance of shuttle beak from
needle

B

feed-dog standstill when stitch-length regulator moves,

classes 271 + 273

(feed-dog TDC)
foot-overfeed standstill when upper regulator moves
(

class 275

).

C

2nd needle position

D

control cam for thread clipper

E

needle-bar height,
feed-dog standstill when stitch-length regulator moves,

classes 272 + 274

(feed dog TDC).
lift cam,

class 275

.

F

1st needle position

1
2

3

A

C

E

D

B

3 4

F

5

1.3 Positioning the i ntegral adjusti ng disc with respec t to the a rm shaft

IMPORTANT

Adjustments carried out with the adjusting disc will only be correct if
the disc it sel f ha s be en ad j us t ed as d es cr i b ed be l ow.
If the arm shaft is moved, all subsequent settings must be checked
and adjusted if necessary.

Caution: danger of injury

Turn off the main switch.
The position of the arm shaft may only be adjusted with the sewing
machine switched off.

Regulation and inspection

The groove 4 an d n otch A of the adjusti n g d i s c on the
synchronous -b el t pu l l ey m us t c oin c i de on th e

X - Y

line.

–

Lock the arm sh af t with a locking pi n or a 5 m m Ø p in i n th e
arm-shaft gr oo v e 4 (th r ou gh ho l e 3 ) .

–

It must be possible to pass the locking pin through the hole 2 in
position A into the integral adjusting disc.

Adjustment

–

Remove bobbin-winder cover 1.

–

Undo the screws o f sy n chr o no us- b el t pu ll ey 6 fro m a bo v e w i th th e
Allen key 5 t hr o ug h t he ho l e.

–

Lock the sync hronous-belt pu ll ey i n po s iti o n A with the locking pin.

–

Insert a 5 mm-th i c k pi n into the rig hole 3 a nd al l o w it to engage in
the arm-shaft groove 4.

–

Tighten the screws on th e sy n c hr o no us- b el t pu l l ey 6 .
The synchro no us- b el t pu l l ey must not be axi al ly s h i ft ed .

1
2
3

4

X

Y

5 6

6

2. Null point, feed with fitments

2.1 Null-point adjustment (position of stitch-length regulator)

Regulation and inspection

With the sti tch-length lever 4 or the adjusting wh ee l s 5 in their null
positions the fe ed do g a nd ne ed le m us t no t m ove wh en th e h an dw he el
is turned.

Caution: danger of injury

Turn off the main switc h.
The feed null -po s i ti o n m ust only be adjusted with the ma chi n e
switched off.

Adjustment

–

Set the stitch-length lever 4 or adjusting wheels 5 to "0".

–

Undo screw 3.

–

Insert screwdriver into hole 1.

–

Rotate guide 2.
The feed must not operate when the handwheel is turned.

To increase the forward feed: turn in the + arrow direction
To decrease the forward feed: turn in the - arrow direction

–

Retighten sc r e w 3 .

2

3

1

4

5

7

2.2 Feed halt when the sti tch-length r egulator ( thrust cam) moves

Regulation and inspection

With the sewing machine locked in position B (

class 271/27 3/ 27 5

) or

position E (

class 272/274

) and the stit ch l e ng th at maximum, th er e
must be no feed movement when the stitch-length regulator 2 is
moved.

Caution: danger of injury

Turn off the main switch.
The feed standstill may only be adjusted with the sewing machine
switched off.

Adjustment

–

Set the stitch length to maximum.

–

Undo both screw s of th rus t cam 1.

–

Lock sewing ma chi n e:

class 271/27 3/ 27 5

in position

B

class 272/274

in position

E

.

–

Rotate thrust cam 1.
When the sti tc h -l en gt h r e gu l at or 2 i s mo v ed th e feed dog must
remain at a halt.

–

Retighten both screws of thrust cam 1.
This must place the thrust cam 1 hard up against the bearing
(axial shaft position).

1

2

8

2.3 Hub cam and feed-dog height

Regulation and inspection

With the sewing machine locked in position B (

class 271/273/275

) or

position E (

class 272/274

) markings 3 an d 6 of th e l i f t c a m 7 an d t he

connecting rod 8 must be in line.
In its highest position the fe ed do g s h ou l d p r ot rud e b y 0. 9 o r 1. 1 m m i n

the region of t he ne ed l e h ol e :

0.9 mm with a fine-toothed feed dog

1.1 mm with a coarse-toothed feed dog.

Caution: danger of injury

Turn off the main switc h.
The lift cam and feed-dog height may only be adjusted with the sewing
machine turn ed off.

Lift-cam adjustment

–

Undo both screws of the lift cam 7.

–

Lock the sewing machine:

class 271/273/275:

in position

B

class 272/274

: in position E.

–

Rotate lift cam 7.
The markings 3 and 6 must be in line.

–

Retighten both screws of lift cam 7.

Feed-dog height adjustment

–

Lock the sewing machine:

class 271/273/275

: in position

B

class 272/274

: in position E.

–

Undo screw 1.

–

Rotate eccentric bolt 2.
In its highest position the fe ed do g s h ou l d p r ot rud e b y 0. 9 o r

1.1 mm in the re gi o n o f t he ne ed l e h ol e :

0.9 mm with a fine-toothed feed dog

1.1 mm with a coarse-toothed feed dog.

The position of the eccentric bolt 2 depends on the adjustment of
eccentric bush 4 in the advance lever 5. See section 2.3.1.

–

Retighten sc r e w 1 .

1

2

3

4
5

6

7

8

9

Fig.: A

Fig.: B

Fig.: C

Fig.: D

1

2

1

2

1

2

1

2

10

2.3.1 Eccent ri c bu s h

Regulation and inspection

Class 271/273/275

The eccentri c bush 1 is adjust ed at the factory so th at at

TDC

the feed
dog is parall el t o t he ne ed l e-p l at e s u rfa c e. In th e b as ic p os ition the slit
is horizontal

(Fig. A)

.
When the feed dog emerges from t he needle plate it s ba c k en d
emerges firs t.

When the slit of the eccentric bush is in the

down

position

(Fig. B)

, the
feed dog emerge s fro m the needle plat e i n par a l lel . Th i s avoi d s
stretching the material. This is particularly important with stretch
material or mate r i al which is inelas t ic i n t he wa rp a nd we ft di re c ti o ns
but which stretches when sewn in the diagonal direction.

When the slit of the eccentric bush is in the up position, t he fe ed do g
is at a greate r an gl e

(Fig. C)

when it emerges from the needle plate.
This angled emergence improves "smooth sewing" with inelastic
material suc h a s po pl in and certain li n i ng ma te r i als . If necessary th e
eccentric bush can also be placed in intermediate positions.

Class 272/274

The eccentri c bush 1 is adjust ed at the factory so th at at

TDC

the feed
dog has a sligh tl y re ar w ar d s s l op e. In th e b asi c p os it i on th e s l it i s at an
angle of 45° to the horizont al

(Fig. D)

.

IMPORTANT

If the eccentr ic b us h ha s be en al t er e d, th e f ee d- d og he i gh t m us t be
re-adjusted (see section 2.3).

Caution: danger of injury

Turn off the main switc h.
The eccentric bush may only be adjusted with the sewing machine
switched off.

Adjustment

–

Undo screw 2.

–

Adjust eccentric bush 1.

–

Retighten sc r e w 2 .

11

2.4 Class 272/274: synchronisation of needle feed and underfeed

Regulation and inspection

The needle fe ed an d u nd er f ee d a r e f ac t ory - se t to be equal.

–

Set stitch length to maximu m.

–

Check synchro nis a ti o n b y tu r nin g t he ha nd wh ee l .

Caution: danger of injury

Turn off the main switch.
The needle feed and underfeed may only be adjusted with the sewing
machine switched off.

Adjustment

–

Remove bobbin-winder cover.

–

Check that groove 4 of shaft 1 and slit 2 of block 3 are in line.
If not, turn shaft 1 until they are.

–

Undo locking screw 8.

–

Turn eccentric bolt 6.
Groove 5 and slit 7 must be in the position shown in the illustration.
The synchro nis a ti o n o f n ee dl e fe ed and underfeed i s se t.

–

Retighten locking screw 8.

With feed-critical material, in order to reduce any displacement of the
fabric layers which may occur, the needle feed can be set up to some
15% greater than the underfeed by turning eccentric bolt 6.
Turning it by 180° produces the maximum adjustment.
The distance be tween the needl e b ar a nd pr e s sur e ba r rem ai n s at
9 mm during th i s ad j us t me nt .

If the eccentric bolt is adjusted by less than this, the distance between
the needle bar and pressure bar must be re-adjusted.

IMPORTANT

When the needl e fe ed i s i nc re as e d t he ne ed l e m us t no t touch the
sides of the needle hole in the feed dog.

1 2 3 4

5 6 7 8

1

6
8

12

2.5 Class 272/27 4: dista nce betwee n needle bar and pressur e bar

Regulation and inspection

When the stitch regulator is at "0", the distance between the needle
bar and pressu re bar should be 9 mm.

Caution: danger of injury

Turn off the main switc h.
The distance may only be adjusted with the sewing machine switched
off.

Adjustment

–

Set the stitch regulator to " 0 ".

–

Undo locking screw 2.

–

Swivel the ne ed l e-bar guide.
Use gauge 1 to ad j us t th e d i s ta nc e be tw ee n t he needle bar and
pressure bar to 9 mm.

gauge 1 order no.: 02 71 00 07 67

–

Tighten locking screw 2.

2

9 mm

1

13

2.6 Class 272/274 : aligning t he feed dog

Regulation and inspection

The needle should enter the centre of the feed-dog needle hole if the
distance be tw ee n t he needle bar and pre s s ure bar is correctl y s e t t o
9 mm.

Caution: danger of injury

Turn off the main switch.
The feed dog ma y on l y be ad j ust ed with the sewi ng ma c hi n e s w i tc h ed
off.

Adjustment

–

Undo locking screw 2 of the advance lever 1.

–

Align feed do g.
The needle should enter the centre of the feed-dog needle hole.
The distance between the feed dog and the needle plate should be
equally large at each side.

–

Retighten locking screw 2.

1

2

14

2.7 Class 273/ 274: r oller overfeed

Regulation and inspection

The feed roller 3 is automatically lifted when the sewing foot is raised
and for bar-tacking.
This function must be entered in control field 5.
See setting-up instructions, section 12.

The maximum f ee d length of the inte r mi t te nt r ol ler overfeed is 7 m m.
The feed length can be adjusted independently of the underfeed with
adjusting wheel 4.

With the basi c s t i tc h l en gt h a t 4 mm th e threaded pin 6 l imits the
maximum roll er -o v erfeed feed length to 5 mm.

1 = lever raises the feed roller
2 = button automatically lowers feed roller

the function i s en te red at the control f i eld

Caution: danger of injury

Turn off the main switc h.
The feed length may only be adjusted with the sewing machine
switched off.

Adjusting the maximum feed length

–

Remove threaded pin 6.
The maximum f ee d length is incre as e d t o 7 mm .

IMPORTANT

Account must be taken of the machine’s basic sewing equipment.

Adjusting the raising and lowering function

–

Set the desi red function at th e c o nt r ol f i eld .
(See setting-up instructions, section 12).

1

2

3

4

5

6

15

2.7.1 Synchronisation of underfeed and roller overfeed

Caution: danger of injury

Turn off the main switch.
Synchronisation may only be adjusted with the sewing machine
switched off.

Regulation and inspection

The operation of the underfeed and roller overfeed should be
synchronised.
On no account may the movement of the overfeed roller be completed
before that of the feed dog.

This ensure s th at the material be tw ee n t he sewing foot an d the roller
remains under tension, thus minimising seam-crimping when the
stitches ar e t i gh te ne d.

–

Remove bobbin-winder cover.

–

Lock the sewing machine:

class 273:

in position

B

class 274

: in position

E.

–

The groove 4 of t he cam 2 and the gr oo v e 3 of th e c o nn ec t i ng rod
1 must coincide.

Adjustment

–

Remove locking pi n .

–

Undo fastening screws of cam 2.
It should be possible to rotate the cam on the shaft with minimum
effort.

–

Secure cam 2 with a screwdriver.

–

Turn handwheel:

class 273:

to position

B

class 274:

to position

E.

–

Retighten fastening screws of the cam 2.

–

Check that groove 4 of the cam and groove 3 of the connecting rod
coincide.
If not, the ad j us t me nt mu s t b e r e pe at ed .

–

Replace bobbin-winder cover.

34

12

4

16

2.7.2 Distance between feed roller and needle

Regulation and inspection

The distance between the centre of the roller and that of the needle is

28.5 mm.
Where a compensating hinged foot is fitted the distance is 30 mm.

IMPORTANT

When the distance is reset the upper and lower end positions must
also be re-adj u s te d (s e e s e c tion 2.7.3).

Caution: danger of injury

Turn off the main switc h.
The distance may only be adjusted with the sewing machine switched
off.

Adjustment

–

Undo screw 1.

–

Turn link 2 on the axle.
The distance b et w e en th e c e nt r es o f the roller and t he ne edle must
be 28.5 or 30 mm.

–

Retighten sc r e w 1 .

1

2

28,5 mm

17

2.7.3 Feed-roller lift

Regulation and inspection

In the

upper end position

the lifted fee d r o l l er m us t no t t ou c h t he

sewing foot.
In the

lower end position

, after the roller has been placed on the
needle plate, the link 1 must encounter elastic resistance about 1 mm
before the hand-lever stop reaches its limit position.

If a

steel roller

is used there must still be a gap in the lower end
position. Th e s t ee l r ol le r mu s t n ot ma k e c o nt ac t wi t h th e ne ed l e pl a te ,
which it would damage.

Caution: danger of injury

Turn off the main switch.
The lift may only be adjusted with the sewing machine switched off.

Adjusting the upper end position

–

Rotate bolt 2.
The slit of the bolt must be parallel to the cylinder axle.

–

Limit the stroke of cylinder 3.
Use a 2.5 mm Al l en ke y to ad j ust t he thre ad ed pin 7 accordingl y.

6 = access to threaded pin 7

Adjusting the lower end position

–

Undo locknut 4.

–

Screw threaded pin 5:
in: to raise
out: to lower.

–

Retighten locknut 4.

1

2
3
4

5

6
7

2

18

2.7.4 Roller p re ss u re

Regulation and inspection

The feed-roller pressure must be suitable for the material being sewn.

IMPORTANT

If the pressure has been altered the upper end position must be
re-adjusted (see section 2.7.3).

Caution: danger of injury

Turn off the main switc h.
The roller pre s s ure ma y on l y be ad j usted with the sew i ng ma c hi n e
switched off.

Adjustment

–

Undo screw 2.

–

Move cylinder 1:
in the direction of arrow

A:

to reduce pressure

in the direction of arrow

B:

to increase pressure.

–

Retighten sc r e w 2 .

2.7.5 Fabric deflector
Regulation and inspection

The function of th e f ab r ic de fl e c to r 3 is t o p r ev e nt th e m at er i a l fro m
getting into t he gap. The pressure of the fabric de fl e cto r on th e r oll e r
should be such that the roller can only just rotate freely. If a steel roller
is fitted, the fabric deflector must be removed.

Caution: danger of injury

Turn off the main switc h.
The fabric deflector may only be adjusted with the sewing machine
switched off.

Adjustment

–

Undo screw 4.

–

Adjust fabric deflector 3.

–

Retighten sc r e w 4 .

1

2

3
4

19

2.7.6 Roller-overfeed belt tension

Regulation and inspection

The tension in the synchronous belts should so be such that the step
lengths are pr e c i sel y t r an smi t ted.

Excessive belt tension can cause heavy wear and malfun c ti o ns.

Caution: danger of injury

Turn off the main switch.
The upper and lower belt tension may only be adjusted with the
machine turned off.

Adjusting the upper synchronous belt

–

Undo screw 2.

–

Move lever 3.
Adjust the t en s i on of th e s ynchronous belt 1 a s r eq ui re d.

–

Retighten screw 2.

Adjusting the lower synchronous belt

–

Undo screw 6.

–

Move lever 5.
Adjust the t en s i on of th e s ynchronous belt 4.

–

Retighten screw 6.

1

23

4 5 6

20

2.7.7 Replacing the feed roller

IMPORTANT

If a Vulkollan roller is replaced by a steel roller or vice versa, the lower
end position mu s t b e re - ad j us t ed (s ee s ec t i on 2. 7. 3) .

If a steel roll e r i s fi t ted, the fabric de fl e cto r mu s t b e r e mo ved.
If the 15mm-wide rubber roller is being used, the broad fabric deflector

(order no.: 0273 000620) must be fitted.

Caution: danger of injury

Turn off the main switc h.
The feed rolle r mu st b e re pl a c ed wi t h t he s ew i ng ma c hi n e s w i tc h ed off.

Replacing the roller

–

Remove nut 1.

IMPORTANT: this nut has a left-handed thread.

Lock axle 3 at the other end wi th a s c re w d ri v er.

–

Replace feed r ol ler 2.

–

Replace nut 1.

item order no.: description

4 0933 005763 steel roller 9 mm
5 0933 005737 steel roller 15 mm
6 0933 005738 a steel roller 15 mm, 2 mm saw-tooth
7 0933 005737 a rubber roller 15 mm
8 0933 005725 Vulkollan roller 9 mm

45678

1 2 3

21

3. Foot height and lift

The maximum s ewing-foot lif t i s 12 mm for machines wi th ou t a thread
clipper and 7 mm fo r ma c hi n es with a thread c l ipper.

3.1 Pressure-bar height

Regulation and inspection

Class 271/27 3/ 27 5

When the sol e o f t he fo ot is in contact wi t h t he needle plate t he r e
should be a di stance of 0.5 mm between the blo ck 1 a nd th e traction
bracket 3.

Class 272/27 4

When the sol e o f t he fo ot is in contact wi t h t he needle plate t he r e
should be a di stance of 0.5 mm between the blo ck 1 a nd th e b us h 4.

Caution: danger of injury

Turn off the main switch.
The height of the pressure bar may only be adjusted with the sewing
machine switched off.

Adjustment

–

Remove cover.

–

Undo screw 2.

–

Adjust the pressure-bar height.
The distance should be 0.5 mm as described above.

–

Align the sewi n g f oot s o th at th e n ee dl e en te rs th e ce ntre of the
sewing-foot needle hole and retighten screw 2.

–

Replace cover.

0,5 mm

2

5

4

0,5 mm

1

2

3

22

3.2 Mechanical foot lift

Regulation and inspection

With the sewing foot in contact with the needle plate a small amount of
free movement must be perceptible in the knee lever.

Caution: danger of injury

Turn off the main switc h.
The knee lever may only be adjusted with the sewing machine
switched off.

Adjustment

–

Undo nut 4.

–

Adjust the maximum lift with stop screw 3.

–

Retighten n ut 4.

–

Undo nut 2.

–

Adjust screw 1.
With the sewing foot in contact with the needle plate a small
amount of free m ov e me nt mu s t b e p er c e pt i bl e i n t he k ne e lever.

–

Retighten n ut 2.

1

2

3

4

23

3.3 Electromagnetic foot lift

Regulation and inspection

The armature o f t he l i ft i ng ma gn et must reach its l e ft - ha nd en d
position when i t i s o pe r at ed .

After sever al ye ar s ’ intens i v e use the dimensions o f t he da mp i ng di sc
6 may change, as a result of which the lowering of the sewing foot
becomes too slow or the magnet makes knocking noises when it
operates. This can mean that when started up the sewing machine
executes a f ew s ti t c he s before the foot ha s fu l l y r ea c he d t he ma te r i al
(i.e. there i s a d an ge r of fa ul t y s titches at the st art of the seam).

Caution: danger of injury

Turn off the main switch.
The sewing-foot lift may only be adjusted with the sewing machine
switched off.

Adjustment

–

Undo nut 2 and scr e w 1 .

–

Set the required lift with the articulated lever 3.
The armature o f t he l i ft i ng ma gn et 4 must reach it s l ef t- h an d e nd
position.

–

Retighten screw 1 and nut 2.

–

Remove retainin g washer 5.

–

Remove the li ft i ng ma gn et fr o m i t s ho us in g.

–

Replace damping disc 6 (0271 001767).

–

Replace lifting magnet.

–

Replace retai nin g w as h er 5 .

IMPORTANT

In case of the classes

273

and

274

please note that following a

change of the l i f t

it is absolutely necessary to ensure

that, in lifting
position, the minimum distance between the hinged foot top 8 and the
fabric bar bu s h 7

amounts to 0.5 mm

.

Otherwise, the parts of the lifting system may be damaged.

1 2 3 4

5 6

7

8

min. 0,5 mm

24

3.4 Hinged foot

Regulation and inspection

With the hing ed fo ot th e h ei g ht of the pressur e b ar sh ould be such tha t
when the foot is l o we r ed th e s o l e o f t he fo ot exe c ut es o nly a s ma ll fe ed
movement on the needle plate before the block makes contact with the
pressure bar ( s ee pa ge 22 ) .

This ensures that only the sprung sole exerts slight pressure on the
material.

Caution: danger of injury

Turn off the main switc h.
The hinged foot may only be adjusted with the sewing machine
switched off.

Adjustment

–

Adjust the pressure bar (see section 3.1).

–

Undo the screw on the back of the bolt 1.

–

Adjust bolt 1.
The torsion spring 2 determines the pressure exerted by the sole
of the foot 3.
The resilience of the spring should be adjusted with bolt 1 so that
the fabric layers are sewn together with stitches of equal length,
and without bei n g sh i ft ed wi t h re s pe ct t o e ac h ot he r.

–

Retighten t he s cr ew on th e b ac k o f t he bo l t 1 .

1

2

3

25

3.4.1 Compensating hinged foot

Regulation and inspection

With the compensating hinged foot the pressure exerted by the sole of
the foot is altered by replacing the pressure springs 5.
Two pairs of springs of different strengths are supplied with each foot.

To alter the backstitch width to the left or right of the needle only the
sole of the fo ot ne eds to be replace d.

Caution: danger of injury

Turn off the main switch.
Foot pressure may only be ad jus t ed wi t h the sewing mac hi n e s w i tc h ed
off.

Adjustment

–

Remove nut 4 wi th sc rew.

–

Insert extrac t or tool 3 in the hol e 6.

–

Prise off the sol e of th e f oot.

–

Fit new sole to alter the backstitch width. Replace springs.

–

Replace sole of the foot.

–

Replace nut 4 w ith s c rew.

–

Undo screw 1.

–

Align the sewi n g f oot s o th at th e n ee dl e en te rs th e ce ntre of the
sewing-foot needle hole.

–

Retighten screw 1.

IMPORTANT

In the raise d p osi t i on th er e mu s t b e a s ma l l ga p (a bo ut 0.5 mm)
between the block 2 of the compensating hinged foot and the
fabric-rod bush.

1

2
3
4

5

6

26

4. Upper-thread tensioner release

Regulation and inspection

Pressing on the axle 3 opens the tensioner by about 1 mm.

Caution: danger of injury

Turn off the main switc h.
The upper-thread tensioner release may only be adjusted with the
sewing machi n e switched off.

Adjustment

–

Undo screw 1.

–

Move magnet 2.
With the upper-thread tensioner fully closed and with no thread
between the tension discs the axle 3 should have play of about

0.3 mm.

–

Retighten sc r e w 1 .

2

3

1

27

4.1 Thread take-up spring

Regulation and inspection

The thread ta ke- u p s p ri ng 1 s h ou l d k e ep th e u pp er t hread under
tension at least until the tip of the needle has penetrated the material.

Caution: danger of injury

Turn off the main switch.
The thread ta ke- u p s p ri ng ma y on l y be ad j usted with the sewing
machine switched off.

Adjusting the spring travel

–

Undo screw 4.

–

Rotate bush 3.
The spring 1 m us t pre-tension the up pe r th r ea d a t l e as t un ti l t he ti p
of the needle enters the material.

–

Retighten screw 4.

Adjusting the spring tension

–

Undo screw 5.

–

Adjust the te ns i o n va l ue by r o ta ti n g t he te ns i o n b ol t 2.
The tension of the thread-tension spring must be between 20 and
50 cN (1 cN = 1 g ) de pe nd i ng on the material an d t hre ad.

–

Retighten screw 5.

3

4

5

1

2

28

5. Bobbin winder

Regulation and inspection

The bobbin wi nd er s h ou l d a ut omatically tur n off wh en th e b obbin is
fully wound to a po i nt 0. 5 m m u nd er t he r im.

Caution: danger of injury

Turn off the main switc h.
The bobbin winder may only be adjusted with the sewing machine
switched off.

Adjustment

1. Minor adjustments to the wind-on quantity

–

Bend bobbin- w i nd er s e ns o r 3.

2. Major adjustments to the wind-on quantity

–

Remove bobbin-winder cover.

–

Undo screw 2.

–

Rotate trip cam 1:
in the direction of arrow A: to reduce th e w i nd - on qu an ti t y
in the direction of arrow B: to increase th e wind-on quanti t y.

–

Retighten sc r e w 2 .

–

Replace bobb i n- w i nd er c o v er.

3

1

2

A

B

29

6. Needle-bar height

Regulation and inspection
Classes 271/ 27 3/ 27 5

and

272/274

have differing needle-bar heights.

Adjustment an d i n s pe c tio n are carried out with gauges 3 an d 4 .

Caution: danger of injury

Turn off the main switch.
The needle-bar height may only be adjusted with the sewing machine
switched off.

Adjustment

–

Remove needle plate and sewing foot.

–

Undo screw 1.

–

Place gauge 4 on th e n ee dl e - plate surface.
order no.: 0271 000767 for small shuttle (0271 000751/0271 001991)

order no.: 0271 000766 for large shuttle (0271 001021/ 0271 002041)

–

Fit gauge 3 as far as it will go into the needle bar in place of a
needle.

order no.: 02 16 00 10 69 fo r

class 271/273/275

order no.: 02 72 00 12 40 fo r

class 272/274

–

Lock sewing ma chi n e i n po s i ti o n E.
The cross-head 2 is at its lowest position.

–

Push the needle ba r do wn wa r ds.
The foot of the gauge 3 must make c on ta c t w i th ga ug e 4 .

–

Retighten screw 1.

IMPORTANT

The needle-attachment screw must point to the right.

–

Replace needle plate and sewing foot.

1

2

3

4

30

7. Shuttle adjustments

7.1 Loop lift and distance between shuttle beak and needle

Regulation and inspection

The loop lift is the travel of the needle bar from BDC to the point at
which the shu tt l e b ea k i s at the centre of the ne ed l e.
The loop lift is 1.8 mm.

With the sewing machine locked in position A the shuttle be ak 1
should be at th e c e nt r e o f t he ne ed l e.

The distance b et w e en th e s h ut tl e be ak 1 an d t he ne ed l e s h ou l d b e

0.1 mm.

Caution: danger of injury

Turn off the main switc h.
The loop lift and the distance between the shuttle beak and the needle
may only be ad jus t ed wi t h the sewing mac hi n e s w i tc h ed off.

Adjustment

–

Remove sewing foot, needle plate and feed dog.
Fit new needl e.

–

Set the stitch regulator to "0".

–

Lock sewing machine in position A.

–

Undo fasten ing screws of the s h ut tl e 4.
The screws can be reached thro ug h hole 3.

–

Set the shuttle beak 1 to the centre of the needle.
The distance b et w e en th e s h ut tl e be ak 1 an d t he fu r row of the
needle must be 0. 1 m m.
In this positi o n t here is a distan c e o f 0 .4 mm be tween the shutt le 4
and the adjust i ng r ing 2.

If the distanc e of 0. 4 m m i s n ot ac h i ev e d, th e s h ut tl e -dr i ve housing
should be adjusted accordingly (see section 7.2).

–

Retighten f astening screws of th e s h ut tl e 4.

–

Replace sewing foot, needle plate and feed dog.

0,1 mm

1

2

3

4

31

7.2 Shuttle-drive housing

Caution: danger of injury

Turn off the main switch.
The shuttle-drive housing may only be adjusted with the sewing
machine switched off.

Regulation and inspection

The shuttle -dr iv e ho us i n g 4 i s fa ct o ry -al i g ne d.

It may only be altered in exceptional circumstances.

With the shuttle-drive housing correctly aligned there must be a
distance of 0.4 mm between the shuttle and the adjusting ring
(see section 7.1).

The distance be tween the needl e-p l at e s u r fa ce and the
thread-drawing plate 5 is:

with the smal l s h ut tl e = 3.7 mm (0271 000 75 1 / 0271 001991)
with the lar ge s hu tt l e = 3.3 mm (0271 001021 / 0271 0020 41 )

Adjustment

–

Loosen locki ng s c rew 1.
Under the locking screw there is a stop screw.

–

Adjust the stop screw.
The distance be tween the needl e-p l at e s u r fa ce and the
thread-drawing plate 5 is:

with the smal l s h ut tl e = 3.7 mm
with the large shuttle = 3.3 mm

The distance is checked with gauge 2.
with the small shuttle = order no.: 0271 000767
with the large shuttle = order no.: 0271 000766

–

Retighten locking screw 1.

–

Undo 2 screws 3 of the shuttle- dri v e ho us in g.

–

Move the shuttle-drive housing 4.
Between the shuttle and the adjusting ring there must be a
distance of 0.4 mm (see section 7.1).

–

Retighten screws 3 of the shuttle-drive housing.

–

Check the distance of the shuttle beak from the needle and adjust
if necessary (see section 7.1).

3,3 / 3,7 mm

1

2
3
4

5

32

7.3 Bobbin-housing holder

Regulation and inspection

The bobbin-hou s i ng ho l de r is fa c to r y- al i g ne d.
When the holder has been replaced the new holder may need to be

re-aligned.

Caution: danger of injury

Turn off the main switc h.
The bobbin-hou s i ng ho l de r ma y on l y be ad j us t ed wi t h t he s ew i ng
machine swi tched off.

IMPORTANT

Alignment ma y on l y be c ar ri e d o ut i n t he cross-hatche d a r ea ( see
sketch).
The extreme har d ne s s i n t he region of the re taining tab 1 mea ns t ha t
there is a danger of breakage th er e .

Adjustment

–

Align the bo bb i n-housing holde r 4.
The distance between retaining tab 1 of the bobbin-housing holder
4 and the lower pa rt o f t he bo bb i n- h ou si ng 2 s h ou l d b e 0 .6

+0.1

mm.

1

2

3

4

33

8. Thread clipper

The control c a m 4 de te r mines the movemen t o f t he thread clippe r s an d
the timing of th e b lad e m ov e me nt . Th e t i mi n g t hu s co i nci d es wit h th e
movement of th e s t i tc h - fo rmi n g c o mp on en ts .

The thread cl i pp er is s w i tc h ed on el e c tro ma gnetically.

8.1 Control cam for timing the blade movem ent

Regulation and inspection

When the thread clipper is not in operation there must be a distance of

0.2 to 0.3 mm between the external diameter of the control cam 4 and
the ball-rac e 6.

With the machine locked in position D ball-race 6 must engage in the
indentation 5 of the control cam 4 when manually pressed downwards.

Caution: danger of injury

Turn off the main switch.
The control cam may only be adjusted with the sewing machine
switched off.

Adjustment

–

Undo fastening screws 7 of the magnet 1.

–

Move magnet 1.
The distance be tween control ca m 4 and the ball- rac e 6 m us t be

0.2 - 0.3 mm.
The roller 3 must be in contact with the ram 2.

–

Retighten fastening screws 7 of the magnet 1.

–

Lock sewing ma chi n e i n po s i ti o n D.

–

Undo fastening screws of the control cam 4.

–

Turn the control cam o n t he l ower shaft.
The ball-race 6 must engage in the indentation 5 of the control cam
4 when manually p r ess e d d ow nw ar d s.
The axial pos i t i on s ho uld be such that th e c o nt r ol c a m 4 an d r o l l er
6 are opposite each other.

–

Retighten fastening screws of the control cam 4.

1

2

3
4

5

6

6

4

5

7

34

8.2 Positioning the fixed blade

Regulation and inspection

The fixed blade 3 must lie in the direction of the arrow on the screw 1
(see sketch).

Sharpened bl ad es must be aligne d a s de sc r i be d in section 7.3.

Caution: danger of injury

Turn off the main switc h.
The fixed blade may only be adjusted with the sewing machine
switched off.

Adjustment

–

Unscrew cutting-pressure screws 2.

–

Undo screw 1 from below.

–

Push blade 3 i n t he di re c ti o n o f t he arrow against s c rew 1.

–

Partially ti g ht en s c rew 1 from above.

–

Adjust the cutting pressure (see section 8.6).

–

Fully tight en s c rew 1 from below.

1 2

1

3

1

2

3

35

8.3 Sharpening the fixed blade

Regulation and inspection

The cutting angle of the fixed blade 6 is 15° (see sketch).
It is essent ia l fo r s ha rpe ni n g t o be carried out w i th a f i ne - gra i ne d

whetstone.

Caution: danger of injury

Turn off the main switch.
After sharpening the blade must be replaced with the sewing machine
switched off.

IMPORTANT

Blades which have lost more than 0.5 mm of their original length
through sharp en i ng mu s t b e r e pl a c ed .

Adjustment

–

Undo screws 2 a nd 3.
The pre-tens i on of th e f i x ed bl a de 6 i s r e du c ed .

–

Remove the blade 6.

–

Sharpen the blade.
The cutting an gle of the fixed bl a de i s 15 °.

–

Replace the blade.

–

Align the bl ad e so that the dista nc e be tw een the cutting e dg e 5
and the edge 4 of the opening in the needle plate is 38.5 mm.

IMPORTANT
When replacing a blade after sharpening it must not be
allowed to make contact with the screw 1.

–

Fully tighte n s c re w 1.

–

Re-adjust th e a t-r e s t p os ition of the hook ed bl a de ( see section 8.5)
and the cutti ng pr e s sur e (s ee s ec t i on 8. 6) .

15°

6

1
2
3

4

5

36

8.4 Thread-guide plate, adjusting plate

Regulation and inspection

Thread-guide pl a te 2 i s used with the s ma l l shu ttle, the adjus ti n g p l at e
5 with the lar ge s hu tt l e.

The thread-guide plate 2 or adjusting plate 5 must point in the
direction of the arrow on the screw 3 (see sketch).

In this position the radial distance between the thread-guide plate 2 or
adjusting pl a te 5 a nd th e t hr e ad - dra wi n g p l at e 4 of the shuttle mus t b e

0.5 mm.
There must be a r a di a l dis t an c e o f 0 . 3 mm be tw ee n t he thread-guide

plate 2 or adjusting plate 5 and the hooked blade 1.

Caution: danger of injury

Turn off the main switc h.
The thread-guide plate or adjusting plate may only be removed with
the sewing machine switched off.

IMPORTANT

When the thread-guide plate (adjusting plate) has been fitted the
distances to the thread-draw i ng pl a te 4 and hooked blad e 1 mu s t b e
checked.

Adjustment

–

Partly undo screw 3.

–

Remove threa d- g uide plate 2 or adj u st in g plate 5 for alig nment.

–

Align thread-guide plate 2 o r ad j us t i ng pl a te 5.

–

Replace the thread-guide plate 2 or adjusting plate 5 and secure
with screw 3.

1 4 5 3

2

3

1
2

3

37

8.5 Hooked blade

Regulation and inspection

The hooked blade 2 must lie a ga i nst the two screw s 1 i n th e d i rec t i on
of the arrow.

With the hook e d b l ad e i n th e a t- re s t p os i t i on i ts t i p 6 an d t he c ut ti n g
edge 7 of the f i xed bl a de 5 m us t be at the same leve l .

During the blade movement the tip 6 of the hooked blade must be
exactly bene ath the tip of th e t ri an gl e 3 i n th e t hr e ad - gu ide plate 4.

Caution: danger of injury

Turn off the main switch.
The hooked blade may only be ad j ust ed with the sewi ng ma c hi n e
switched off.

Adjustment

–

Manually sw iv el h oo k ed bl a de 2 u pw ar d s .

–

Undo fastening screws 1 of the hooked blade.

–

Push the hook ed bl a de 2 i n th e d i rec t i on of th e a r r ow ag ai n s t t he
attachment s c rews 1.

–

Retighten fastening screws 1.

–

Undo screw 8.

–

Adjust the at-rest position of the hooked blade 2.
With the hook e d b l ad e i n i ts a t-r e s t p os ition its tip 6 an d t he c ut ti n g
edge 7 of the f i xed bl a de 5 m us t be at the same leve l .

–

Retighten screw 8.

–

Operate the ho ok e d b l ad e 2 ma nu al l y.
Check that th e t ip 6 of th e h oo k ed bl a de coi n c ide s wi t h t he tip of
the triangle 3.

–

For adjustment undo screws 1 and align the hooked blade 2.

Adjustment note

With the hook e d b l ad e 2 pr o pe rl y ad j us t ed i ts t i p 6 mo ves a l on g t he
line 9 during th e c u tt i ng pr o c ess .

The dotted line 9 runs approximately between the centre of the needle
and the shuttl e be ak .

12

3 4

567

38

9

2

6

3

0,1 mm

5 1

2 6 3 4

8

5 7

6

39

8.6 Cutting pressure

Regulation and inspection

The thread must be reliably severed with pressure as low as possible.
Low cutting pressure minimises wear.

Two of the thickest threads used must be severed simultaneously.

Caution: danger of injury

Turn off the main switch.
The cutting pre s s ure ma y on l y be ad j usted with the sewing machine
switched off.

Adjustment

–

Loosen the cutting-pressure screws 1.

–

Swivel the hooked blade 4 under the fixed blade 2.
The cutting ed ge 5 o f t he ho ok e d b l ad e m us t be un de r th e c u tt i ng
edge 3 of the fixed blade 2.

–

Set the fixed blade 2 against the hooked blade 4 by screwing in the
cutting-pressure screws 1.

–

Alternately lay the thread to be severed to the right and left.
Adjust the a pp r op ri at e c u tt i ng - pre s s ure s c rew.

–

If the spring no longer returns th e c u tt i ng me c ha nis m to i ts s t arting
position, the cutting pressure is too great.
Sharpen (see s ec t i on 7. 3) o r r ep lac e fi x e d b l ad e 2 .

3

4

5

1

2

40

9. Class 271/272: thread retractor

If at the start of a seam the upper thread-end is supposed to be pulled
through to the underside of the material, it must not be caught between
the sewing foot and the material. The thread retractor ensures that the
upper thread-end hangs loosely from the eye of the needle.

The movement of the thread retractors takes place after the threads
have been sev ere d a nd be fore the sewing fe et ha v e be en ra is ed . T he
function can be s et at th e c o nt r ol.

The thread retractor can be switched on and off with the rocker switch

9.

Regulation and inspection

At the end of the forward retraction movement the lever 4 should be in
contact with th e Vulkol l a n d i s c 3.

The retraction movement should be completed without hindrance.

Caution: danger of injury

Turn off the main switc h.
The thread retra cto r ma y on l y be ad jus t ed wi t h t he sewing machine
switched off.

Adjustment

–

Undo screws 7 and 8.

–

Adjust magn et 1.
At the end of the forward retraction movement the lever 4 should
be in contact wi t h t he Vulkoll an di sc 3 .

–

Retighten sc r e ws 7 an d 8 .

–

Undo screws 2.

–

Adjust the retracto r wire 6.
The retraction movement should be completed without hindrance.

–

Retighten screws 2.

IMPORTANT

If the thread r et rac t or i s being used toge th er w i th th e c o mp en s at i ng
hinged foot, transmission lever 4 must be replaced by transmission
lever 5 (order no.: Z120 001841).

7

8

9 1

3456

2

41

10. Class 272: edge cutter

On sewing ma c hi n es w i th th i s ac c e s sor y t he edge of the materi a l c an
be cut during the sewing process.

In sub-classes

272 - 640141

and

272 - 640142

it is mechanically

driven. It is switched on and off by a manual lever or button.
Programming th e o n- a nd - off fu nc t i on i s de s c ri be d i n th e s e tt i ng - up

instructions, section 13.
The

272 - 740142

sub-class is fitted with a separate electrical drive.

Regulation and inspection

The edge cutter must cut reliably with the pressure as low as possible.

Caution: danger of injury

Turn off the main switch.
The edge cutter may only be adjusted with the sewing machine
switched off.

1. Adjusting the position of the blades in the direction of sewing

–

Undo screw 11.

–

Adjust blad e h ol d er 1 0.
The point at which the blade begins to cut can be set in front of
and behind the needle.

–

Retighten screw 11.

2. Adjusting the cutting position

–

Swivel the upper blade 5 down manually with the Allen key 7
(cylinder 9 e xte nd ed ) . S e cur e th e p osi t i on wit h g au ge 8.

gauge 8 order no.: Z1 24 00 0443
On sewing machines with a manual lever the manual lever is used

to adjust the position of the upper blade.

–

Move the upper bl a de 5 t o

BDC

with the handwh ee l.

With sub-class

-740142

this is done with the knurled sc rew on the

separate drive motor (see arrow).

1

2
3

4

5

6

78 9

42

–

Undo screw 1.

–

Adjust block 3.
The upper blade 5 should be parallel to the lower blade 6.

IMPORTANT

When the block 3 is turned it should be constantly pressed
upwards and brought to rest against the ledge of the blade bar 15.

–

Retighten sc r e w 1 .

3. Adjusting the blade-height position

–

Remove cover.

–

Swivel the upper blade 5 down manually with the Allen key 7
(cylinder 9 extended). Secure the position with gauge 8.

On sewing machi ne s wit h a ma nu al l e ver t he ma nu al l e v er i s u sed
to adjust the p os i t i on of th e u pp er b l ad e.

–

Move the upper blade 5 to

BDC

with the handwheel.

With sub-class

-740142

this is done with the knurled screw on the

separate drive motor.

–

Undo screw 14.

–

Adjust the h ei g ht of bl a de ba r 15 .
When the blade is at

BDC

the edge of th e b l ad e should be at the

same level as the lower blade.

–

Retighten sc r e w 1 4.

–

Check the bl ad e p os i t i on at

TDC

.

At

TDC

the tip of the blade should still be in contact with the lower

blade.

4. Adjusting the cutting pressure

–

Undo threaded pi n 4.

–

Adjust screw 2.
Move the upper bl a de ag ai n s t t he l ow er b lade.
The edge cutte r s ho ul d c ut r eli a bl y w i th th e m i ni m um po s s i ble
pressure.

–

Retighten t hre ad ed pin 4.

–

Use the Allen key to carry out a manual cutting test.
Re-adjust the p osi t i on an d c u tt ing pr e ss ure i f n ec e ss ary.

10

11

12
13

14

15

2
4

56

56

43

10.1 Replacing the sewing equipment

Regulation and inspection

The fitments should be selected in the light of the desired sewing result.
The feed dog, slider and foot should be replaced or adjusted as required.

Caution: danger of injury

Turn off the main switch.
Fitments may only be replaced with the sewing machine switched off.

Replacing the sewing equipment (without replacing the needle
plate)

–

Remove the foot an d sl i d er.

–

Remove 2 screws 7.
The centring s l ee ve 9 ensures that the position of th e n ee dl e pl a te
is correct.
The screw 8 must

not

be undone.

–

Remove needle plate 6.

–

Replace the sew i ng eq ui p me nt .

–

Replace needle plate 6.

–

Retighten 2 screws 7.

–

Carry out a manual cutting test and if necessary re-adjust the
blade as described in section 9.

–

Replace the foot an d s l i d er.

Replacing the sewing equipment (with replacement of the needle
plate)

–

Remove the foot an d sl i d er.

–

Remove screw 7 and screw 8 with centring sleeve 9.

–

Remove needle plate 6.

–

Undo screw 1.

–

Replace the sew i ng eq ui p me nt .

4

5

6

7

8

9

12 3

44

–

Adjust the guide 4.
The guide must be adapted to the width of the needle plate (cutting
width).

–

Fit new needle plate 6.

–

Replace screw 7 and screw 8 with centring sleeve 9.

–

Align needle plate.
The feed dog sh ou l d ru n i n th e c e nt r e o f t he ne ed l e- p l at e s li t s .

–

Retighten sc r e ws 8 an d 7 .

–

Move the guide 4 against the lower blade.

–

Retighten sc r e w 1 .

–

Align the up pe r blade to the lower bl a de . S e e s e ct io n 9.
Carry out a manual cutting test and if necessary re-adjust the
blades.

–

Replace the foot and slider.

10.2 Adjusting the indicator bracket

Regulation and inspection

The tip of the in di ca to r bra c ket 1 i n di c a te s wh er e th e b lad e s t ar t s to
cut.

Caution: danger of injury

Turn off the main switc h.
The indicator bracket may only be adjusted with the sewing machine
switched off.

Adjusting the indicator bracket

–

Undo screws 3 and 4.

–

Adjust the i n di ca to r br a ck et 1.
The height adjustment should be such that the material passes
freely beneath the bracket (use the thickest material).
The front edges of the bracket and the blade 2 must be in line with
each other.

–

Retighten sc r e ws 3 an d 4 .

12

3

45

10.3 Sharpening or replacing the blades

Regulation and inspection

The blade should cut reliab l y with the minimum p os s ible pressure.

Caution: danger of injury

Turn off the main switch.
Replace the blade with the sewing machine switched off.

Replacing the upper blade

–

Undo screws 4 a nd 5.

–

Remove upper blade 2 or 3.

–

Sharpen the up pe r blade.

IMPORTANT

Only the sur fa c e m ark e d w i th th e arrow may be sha r pe ne d.

–

Replace the uppe r bl a de.

–

Retighten screws 4 and 5.

–

Carry out a manual cutting test and if necessary re-adjust the
upper blade as described in section 9.

–

Check the blade overlap at

TDC

.
If sharpening the upper blade has made it too short (the tip no
longer makes contact with the lower blade) a new blade must be
fitted.

Replacing the lower blade

–

Remove the slider, foot and needle plate.

–

Undo 2 screws 1.

–

Remove lower bla de 6.

–

Sharpen the l ow er b l ad e.

IMPORTANT

Only the sur fa c e m ark e d w i th th e arrow may be sha r pe ne d.

–

Replace lower bla de 6.
The cutting edge must make contact with the upper blade.

–

Retighten 2 screws 1.

–

Replace the slider, foot and needle plate.

1

23

4

5

6

2

46

1 1. Class 271: cross-cutter

On sewing machines with this attachment an incision transverse to the
direction of sewing can be made in the material at every 6th stitch.

Regulation and inspection

The cross-cutter should cut reliably with the minimum possible
pressure.

Caution: danger of injury

Turn off the main switc h.
The cross-cutter may only be adjusted with the sewing machine
switched off.
On completion of the adjustmen ts t he c ov e r mu s t b e r e pl a c ed .

Adjusting the cutting depth

–

Undo screws 6.

–

Adjust the thrust piece 7 and counter-blade 2.
The tip of the thrust piece 7 and the tip of the counter-blade 2
should be level wi t h t he to p o f t he ne ed l e p lat e.

–

Retighten screws 6.

–

Undo stud bo lt 4 and screw 3.

–

Adjust beari n g b l oc k 5 .
The front of the c o un te r-bl a de 2 s h ou ld m ov e to wa rds t he op era to r
and make contact with the needle plate.
When the cutting movement is carried out the tip of the movable
blade 1 shoul d m ov e pa st t he pre s s ure foot and the ne ed l e p l at e a t
a minimum distance.
After the adj us t me nt ha s be en c arr i e d o ut th e b ac k e dg e o f t he
bearing block 5 mu s t o nc e mo re be parallel to the back edge of th e
base plate.

This adjustment transverse to the feed direction maximises the
cutting depth . To reduce the cutting depth the beari n g bl o c k 5 mus t
be moved to the r i g ht .

–

Retighten st ud bolt 4 and scre w 3 .

1
2
3
4
5

6
7

1

2

47

Adjusting the blade lift

–

Move the manual l e v er t o the left.
The cross-cutter is switched on.

–

Turn the handwheel.
The roller 3 sho ul d be at the highest po i nt of th e c a m d i s c 2.
In this posi t i on th ere s ho ul d be a d i s ta nc e of ab ou t 1 mm be tween
the locknut 9 a nd th e c o v er p l at e 1 0.

–

Unscrew the toggle link socket 6.

–

Undo locknut 7.

–

Adjust the distance by lengthening or shortening the connecting
rod 8. The tog gl e li nk s o c ket must be rotated acco r di n gly.

IMPORTANT

The connecti ng r od 8 m us t be fi rmly screwed i nt o t he to gg l e l i n k
socket as far as it will go.

–

Retighten locknut 7.

–

Replace toggle link socket 6.

–

Turn the handwheel.
The roller should be completely clear of the cam.
The blade is at its highest position.

–

Undo screw 4.

–

Adjust stop 5.
Between the st o p 5 an d t he bl a de l ev e r 1 t here should be a
distance of 0. 5 m m.

–

Retighten screw 4.

Adjusting the timing of the blade movement

Depending on the thickness of the material the timing of the cutting
movement of the movable blade must be such that the blade does not
touch the material until the moment when the feed process has been
completed.

–

Undo screws 11.

–

Turn worm 12.

–

Retighten screws 11.

ca. 1 mm

0,5 mm

1
2
3

4
5
6
7
8
9

10

11 12

3

2

48

Adjusting the cutting pressure

–

Undo screw 4.

–

Adjust beari n g b us h 5.
The driver pin 1 of the blade lever should make intimate contact
with the counter-blade.

–

Retighten sc r e w 4 .

–

Undo locknut 2.

–

Adjust the cutting pressure by turning the screw 3.
The blade should cut reliably with the minimum possible pressure.

IMPORTANT

Heavy cutting pressure causes excessive blade wear.

–

Retighten lo c k nu t 2 .

Replacing the cam disc

The cross-cutter can be fitted with various cam discs to permit varying
distances between the incisions.

order no.: incision

0219 006305 after every 4th s ti t ch
0219 006301 after every 6th s ti t ch
0219 006307 after every 12th s t i tch

–

Move the manual lever to the right.
The cross-cutter is switched off.

–

Undo threaded pins 7 and 8 of the cam disc 6.

–

Remove cam disc 6 upwards.

–

Fit new cam di sc on to th e s h af t 9 as f ar a s th e s h ou l de r.

–

Tighten threaded pins 7 and 8.
The threaded pin 8 must press on the surface 10 of the shaft.
This ensures that the timing of the blade movement will be correct.

6
7
8

9

10

1

2
3

4

5

49

12. Class 275: differential foot overfeed

12.1 Adjusting the overfeed-foot travel

Sewing machines of

class 275

enable an extra layer of mate ri al t o b e

processed.

Regulation and inspection

If the sewing machine is in po s i ti o n B and a stitch l e ng th of 4 m m i s
set, the overfeed foot must not move when the overfeed guide is
swivelled.

If the sewing machine is in po s i ti o n B the advance l eve r 1 s h ou l d b e
vertical.

Caution: danger of injury

Turn off the main switch.
The feed may only be adjusted with the sewing machine switched off.

Adjusting the feed

1. Adjusting the thrust cam

–

Set stitch length to 4 mm.

–

Remove bobbin-winder cover.

–

Lock sewing ma chi n e i n po s i ti o n B.

–

Undo 2 screws of thrust cam 4.

–

Rotate the thrust cam on the arm shaft.

–

Retighten 2 screws of thrust cam 4.

2. Adjusting the advance lever

–

Set the stitch length to 4 mm.

–

Remove bobbin-winder cover.

–

Lock sewing ma chi n e i n po s i ti o n B.

–

Undo 2 screws 3 of the locking hu b 2.

–

Move the advan c e l e ver 1 to th e v e r tic a l .

–

Retighten 2 scre w s 3 of th e l o c ki ng hu b 2 .

2 3 4

1

50

12.1.1 Synchronisation of overfeed foot and feed dog

Regulation and inspection

Set the stitch length to 4 mm for the feed dog

and

the overfeed fo ot .
Turn the sewing machine on wi t h t he ha nd wh ee l.
During the over f ee d- f oo t w or k i n g p ha s e t he ov e rfe ed fo ot and feed
dog must be synchronised.

Caution: danger of injury

Turn off the main switc h.
Synchronis at i on ma y on ly be ad j us t ed wi t h t he s ewing machine
switched off.

Adjustment

–

Set the stit c h l e ng th to 4 m m f or t he fe ed do g

and

the overfeed

foot.

–

Remove bobbin-winder cover.

–

Undo screw 3 of the clamping lever 4.

–

Rotate guide 1 (insert pin in hole 2).

Rotation in the + direction increases the overfeed.
Rotation in the - direction decreases the overfeed.

–

Once the ove rfe ed an d u nderfeed are syn c hro ni s e d, r et i gh te n
screw 3 of the c lam pi n g l e v er 4 .

1 2

3
4

51

12.2 Adjusting the overfeed-foot lift

12.2.1 Adjusting the overfeed-foot eccentric

Regulation and inspection

In position E the lift cam 1 s ho uld be aligned gr oo ve- t o- g roo v e w i th th e
connecting rod .

Caution: danger of injury

Turn off the main switch.
The lift may only be adjusted with the sewing machine switched off.

Adjustment

–

Remove bobbin-winder cover.

–

Lock sewing ma chi n e i n po s i ti o n E.

–

Undo 2 screws of the lift cam 1.

–

Turn lift cam 1.
The groove sh ou l d b e i n l ine with the groov e of th e l o c ki ng hu b 2 .

–

Retighten 2 screws of the lift cam 1.

1 2

52

12.2.2 Adjusting the overfeed lift height

Regulation and inspection

The overfeed fo ot has a maximum li ft of 2 mm.
In position E the distance between the foot-attachment block 5 and the

bearing block 4 of th e r o c ker l e v er 2 i s 71 mm .

Caution: danger of injury

Turn off the main switc h.
The lift may on l y be ad j us t ed wi t h t he s ew i ng ma c hi n e s w i tc h ed off.

Adjustment

–

Remove cover.

–

Lock sewing machine in position E.

–

Undo screw 3.

–

Move bearing block 4.
The distance between the foot-attachment block 5 and the bearing
block 4 should be 71 mm.
Note:
The foot-atta c hm en t b l ock m us t be i n c l o se c o nt ac t wi t h t he
pressure bar.

–

Retighten sc r e w 3 .

–

Undo screw 6 of th e l o c k ing hub 7.

–

Rotate lifting shaft 1.
The overfeed fo ot 8 s h ou l d h av e a m ax i m um l i ft of 2 m m t o t he
needle plate 9 .

–

Retighten sc r e w 6 .

9

8

2 mm

7

6

1

2

3
4

5

53

12.2.3 Position of the overfeed foot

Regulation and inspection

The overfeed foot is adjusted at the factory so that light and
medium-weight material is laid on the feed dog in parallel.

The lay (incl i n at i on ) can be altered to s u i t t he ma te r ial .

Caution: danger of injury

Turn off the main switch.
The inclina ti o n o f t he ov e r fe ed fo ot ma y on l y be ad j usted with the
sewing machine switched off.

Adjustment

–

Undo threaded pins 2.

–

Insert the trunnion 3 further into the advance shaft 1 or partly
extract it.
This adjust s th e i n cl i na ti o n o f the overfeed fo ot .

–

Retighten threaded pins 2.

IMPORTANT

After the in cl i na ti o n o f the overfeed ha s been adjusted th e l i f t m us t be
checked and corrected if necessary.

See section 12.2.2.

1

2

3

54

12.3 Adjusting the extra-thickness operating lever

Regulation and inspection

If the extra-thickness indicator lever 3 has been set to 8 mm by turning
the knurled kn ob 2, the pin 6 should be i n t he ho l e o f t he up pe r gu i de 7
on sheet 5.

Caution: danger of injury

Turn off the main switc h.
Adjust the operating lever with the sewing machine switched off.

Adjustment

–

Set the adjustable extra-thickness stop 1 to 8 mm.

–

Undo locki ng sc r ew 4 o f t he operating le ver.
Press the ext r a-t hi c k n ess i n di c a to r l ev e r ag ainst the adjust ab l e
extra-thickness stop.

–

Rotate the knurled knob 2 until there is a distance of 1 to 2 mm to
the knurled kn ob of the adjustable ex t ra- t hi c kn es s s t op .

–

Press the upp er g ui d e 7 ag ai n s t stop 5 with the p in 6 .

–

Tighten locking screw 4 of the operating lever.

–

Set the extr a-t hi c k n es s i n di c a to r l ev e r 3 t o 4 mm by t urning the
knurled knob and check synchronisation with the feed dog (the
basic stitch-length must also be set to 4 mm).

–

If an adjustment is necessary, proceed as in section 12.1.1.

2 3 4

1

7

56

55

13. Replacing the arm-shaft bearing

Regulation and inspection

The right-ha nd ar m -s ha ft be ar i n g m us t be replaced if the a rm s h af t i s
running stiffly.

Caution: danger of injury

Turn off the main switch.
Replace the a r m-s h af t b earing with the sewing machine s w i tc h ed off.

IMPORTANT

Do not use an ext r ac t or tool
When the rig ht -ha nd arm-shaft bear i n g i s r e mo v ed an d r e placed no
axial pressure must be exerted on the arm shaft. Axial pressure in the
direction of the cover will damage the thread lever.

Replacing the arm-shaft bearing

–

Remove the posi ti o n se ns o r, handwheel , b elt pr o te cto r an d c o ver.

–

Remove the V-belt and 2 retaining springs 1.

–

Remove retaining ring 6.

–

Undo screws 2 a nd 4.

–

Push the sync hr o no us b elt off the upper syn chr o no us -b el t pulley to
the left.

–

Prise off the drive unit with 2 screwdrivers or similar.
The drive unit consists of: synchronous-belt pulley, V-belt pulley
and ball-race.

–

Remove V-belt pulley 3.

–

Remove the synchronous-belt pulley and replace it completely
(order no.: 0271 00 03 22 ) , o r r em ove th e b al l -ra c e 5 wi t h a n
extraction device and press on a new ball-race (order no.:
0211 000362).

–

Replace V-belt pulley.

–

Replace drive u ni t .

–

Replace the parts which have been removed.

IMPORTANT

The sewing machine must be re-adjusted after the arm-shaft bearing
has been replaced.

2 3

4 5 6

1

56

14. Lubrication

Regulation and inspection

The oil level must not fall below the "minimum" mark.

Caution: danger of injury

Turn off the main switc h.
Work on the oil-circulation system may only be carried out with the
sewing machi n e switched off.

Oil can cause skin rashes.
Avoid protracted contact with the skin.
In the event of c o nt ac t , t horoughly wash t he aff ect ed area.

IMPORTANT

The handling and disposal of mineral oils is subject to legal
regulations.
Used oil must be delivered to an authorised acceptance point.
Protect the e nvi r o nm en t.
Take care that no oil is spilled.

Adjustment

–

Top up the oil reservoir 1 to the "maximum" mark.

- For shuttle lubrication see section 13.2 -

The oil reservo i r s ho uld be to pp ed up on l y wit h

ESSO SP-NK 10

lubricating oil or an equivalent oil with the following specification:
viscosity at 40° C: 10 mm

2

/s

flashpoint: 150° C

ESSO SP-NK 10

can be obtaine d f r om

DÜRKOPP-ADLER AG

sales

outlets under the following parts nos.:
2-litre container: 9047 000013
5-litre container: 9047 000014

1

57

14.1 Oil circulati on

The oil pass es f rom the oil reservoi r 5 to th e s u mp 1, fr o m w he r e t he
lubrications points in the arm and sewing-head regions are supplied
with oil.

The oil thrown off by the crank mechanism passes along the wick 2 to
the central dis t r i bu to r pi p e 4 for the lubrica ti o n p oi n ts l o c at ed un der
the base plate. Excess oil drips into the oil-collection tray 6 and is
returned to the sump 1 by the pump 3.

This provide s effec t i v e l u bri c a ti o n w i th mi n i mu m o i l consumption.

Caution: danger of injury

Turn off the main switch.
Work on the oil-circulation system may only be carried out with the
sewing machine switched off.

IMPORTANT

After work is completed it is essential to ensure that the hoses are
correctly reconnected to the pump.

S = suction
D = pressure

1

2

3

4

5

6

58

14.2 Shuttle lubrication

Caution: danger of injury

If shuttle lubrication is checked with the sewing machine switched on,
the utmost care must be taken.

Turn off the main switc h.
Shuttle lubrication may only be adjusted with the sewing machine
switched off.

Regulation and inspection

The oil quantity r e qu ir ed fo r s hu tt l e lu br ic a ti o n va r i es with the sewing
yarns and mater i a l to be processed.

A piece of paper - ideally blotting paper - held beneath the shuttle
should be lightly sprayed with oil when a seam about 1 m long is sewn
at full speed using the intended threads and material.

Adjustment

–

Adjust screw 1:
anti-clockwise = more oil

clockwise = less oil

2 = shuttle-lubrication oil reservoir

2

1

59

15. Control and operating panel

15.1 Control and QUICK operating panel

In this service manual only the most important aspects of the control
system are described.

A detailed descript ion ( pa r am et er l i s t an d d es c ri p ti o n) ca n b e found in
the motor manu fa c tu r er’s detail ed op era t in g manual.

15.1.1 Changing settings

To en s ure th at the settings are no t i n ad v er t en tl y altered they ca n o nl y
be changed by gaining access to the technician level.

Access to the technician level

–

Turn off the main switc h.

–

Simultaneously press the "G" and "-" keys and hold them down.

–

Turn on the main switch and release both keys.
" " app ears in the dis play.

–

Hold down the "G" key and press "-".
"

INPUT

" appears in th e d i s pl a y.
The technici a n- level settings c an no w b e c h an ge d.
The drive is i n op er a ti v e .

Changing settings

–

Press the "G" key.
The group is s e l ect ed.

–

Press the "F" key.
The setting is selected.

–

Press the "+" key.
The selected value is increased.

–

Press the "-" key.
The selected value is decreased.

–

Hold down the "G" key and press the "-" key.
"

*MANUAL

" appears in the display.

The drive is again operative.

G

-

F

-

+

G

-

G

-

G

*

60

15.1.2 RESET

RESET

restores all settings to their factory-set values.

–

Turn off the main switch.

–

Push the peda l fu l l y forwards (step 12 ).

–

Simultaneously press and hold down the "G", "F", "+" and "-" keys
on the control f i eld .

–

Turn on the main switch.
"

RESET +/-

" appears in th e d i s pl a y.

–

Press the "+" key.
All settings are restored to their factory-set values.

IMPORTANT

The "

700

" setting - position-sensor reference point - is not reset.

The "

702

" and "

703

" settings must be checked and corrected if

necessary.

G

+

F

-

+

61

15.2 Control and EFKA operating panel

In this service manual only the most important aspects of the control
system are described.

A detailed descript ion ( pa r am et er l i s t an d d es c ri p ti o n) ca n b e found in
the motor manu fa c tu r er’s detail ed op era t in g manual.

15.2.1 Changing settings

To en s ure th at the settings are no t i n ad v er t en tl y altered they ca n o nl y
be changed on gaining access to the technician level.

1. Selecting adjustment mode

–

Turn off the main switc h.

–

Press and hold down the "P" key.

–

Turn on the main swit c h.
"

C-0000

" appears in th e d i s pl a y.

–

Release the "

P"

key.

The first di gi t of th e c o de nu mb er f l ashes.

2. Changing to technician level

–

Enter code nu mb er "

1907

" with the number keys "

0..9

".

–

Press the "E" key.
The control unit switches to technician level.
The first parameter ("

F-100

") appears in the display.

The technici a n- level parameter s can now be changed.
If an incorre c t c o de nu mb er is e nt er e d t he te x t

"C-0000 InFo F1" appears

. The entry mus t be re pe at ed .

3. Selecting the desired parameters

–

Press the number keys "

0..9

".

The paramete r no . i s selected.

–

Press the "E" key.
The selected parameter number (e.g. "

F-100"

) appears in the first
line. The brief designation of the parameter and its value (e.g.
"

SSc 020"

) appear in the second line.

If an incorre c t p ar a me te r number is entere d t he te x t

"F-XXX InFo F1"

appears. The entry must be repeated.

P

1

9

E

9

...

0

7

0

E

62

4. Changing the displayed parameter value

–

Press the "+" key.
The parameter value is increased or switched on.

–

Press the "-" key.
The parameter v a l ue i s de c r ea s ed or s w i tc h ed off.

5. Saving a changed parameter value

–

Press the "E" key.
The changed parameter value is saved.
The next tech nic i a n- le v el p ar a me te r appears in the di s pl a y.
Repeatedly pre s si ng th e "

E"

key successively displays all
technician- l evel parameters
or

–

Press the "P" key.
The changed parameter is saved.
Select a new p arameter as descr ib ed under point 3.

6. Leaving programming mode

–

Press the "P" key twice.
Programming is terminated.

IMPORTANT

The changed parameter values are not saved until a seam is begun by
depressing th e p ed al .
If the sewing machine is switched off immediately after programming
without sewing, then

none

of the changed p ar a me te r val u es i s sa v ed .

15.2.2 RESET

RESET

restores all settings to their factory-set values.

–

Turn off the main switch.

–

Press and hold do wn th e " P " k e y.

–

Turn on the main switch.
"

C-0000"

appears in the display.

–

Enter the co de nu mb er "

5913

" with the number keys and press the
"E" key.
"

F-400"

appears in the display. The "4" digit flash es .

–

Press the "E" key

.

"

F-400"

and "

rst 093"

appear in the display.

–

Press the "+" key

.

"

F-400"

and "

rst 094"

appear in the display.

–

Press the "E" key

.

The same text ap pe ars i n th e d i s play as when the s ew i ng ma c hi n e
is switched on.
The parameters are restored to their factory settings.

IMPORTANT

Certain parameters such as "

F-170

" (reference position), "

F-171

"

(needle posit i on ) an d "

F-161

" (direction of motor rotation) are not

restored by a

RESET

.
The speciall y- s e t p arameter values ( a mo ng th em mo to r -s pe ed
settings) must be checked and corrected if necessary.

P

5 9 1

3

E

+

E

E

+

-

P

P P

E

63

16. Maintenance

Caution: danger of injury

Turn off the main switch.
Maintenance ma y on l y be carried out wi t h t he s ew i ng ma c hi n e
switched off.

The maintena nc e wo rk to be c arr i e d o ut da i l y or weekly by the s ew i ng
machine’s operating personnel (cleaning and lubrication) is described
in part 1: Operating manual. It is given in the following table for the
sake of completeness.

Work to be carried out operating hours

8 40 160 500

upper part

clean up dust and lint in the area beneath the needle plate. . . . . . . . . . . X

remove dust and lint from between the feed-dog elements . . . . . . . . . . . X

(remove the ne ed l e p l at e)

clean up dust and lint in the area beneath the bobbin brake spring . . . . X

check oil level in reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X

check oil level in shuttle-lubrication reservoir . . . . . . . . . . . . . . . . . . . . . . X

check shuttle lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X

inspect synchronous belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X

sewing drive

remove dust and lint from motor-fan grille . . . . . . . . . . . . . . . . . . . . . . . . . X

inspect condition and tension of V-belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . X

Pneumatic system

check water level in the pressure regulator . . . . . . . . . . . . . . . . . . . . . . . . X

clean filter insert in maintenance unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X

check system impermeability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X

IMPORTANT

The oil should be changed after the first 500 operating hours.
Thereafter it should be changed every 2 years regardless of the
number of operating hours.

64

17. Summary of all sewing-machine settings

IMPORTANT

Adjustments to the sewing machine must be carried out in the order
given.

no. : subject se ction co rrect adju stment correction

adjusting disc

1 position on the arm

shaft

1.3 In position A it must be possible to insert a
pin in the cran k gr o ove.

Rotate synchronous­belt pulley.

feed

2 null point 2.1 The adjusting wheels must make no

movement during the feed process.

Rotate guide.

3 thrust cam 2.2 No advance movement at maximum sti tch

length when the stitch-length regulator is
moved.

Rotate thrust cam.

4 lift cam 2.3 Markings on lift cam an d c o nn ec t i ng r od i n

line.

Rotate lift cam.

5 feed-dog height 2.3 At its highest position the feed dog

protrudes fro m t he ne ed l e p l at e b y :

0.9 mm for the

fine-toothed feed dog

1.1 mm for the

coarse-toothed feed dog

Rotate eccentric bolt.

6 eccentric bu sh 2.3.1 Position of fe ed do g w i th r es p ect to

needle plate ( d ep en ds o n t he ma te r i al) .

Rotate eccentric
bush.

7 Synchronisation of

needle and unde r fe ed .

2.4 Needle feed and underfeed set to be
equal.

Turn eccentric bolt on
underfeed.

8 Distance of needle bar

and pressure b ar

2.5 At stitch length "0": 9 mm. Swivel needle-bar

guide.

9 Align feed do g 2.6 needle i n c en tr e of ne ed l e h ol e . Align feed dog.

class 273/274: roller overfeed

10 feed length 2.7 Maximum feed length: 7 mm. Remove threaded pin.
11 raising and lowering

function

See section 12 of th e s e tt i ng -up
instructions.

Adjust parameters.

12 synchronisation 2.7.1 Groove of cam and connecting rod in line. Rotate cam.
13 dis t an c e f r om

feedroller to ne ed l e

2.7.2 distance between centre of roller and
centre of need l e: 28 .5 mm or 3 0 m m.

Rotate roller
overfeed.

14 li ft 2.7.3 Upper end positi on :

the feed roller must not touch the sewing
foot.
Lower end posit i on :
after being fitted the link must encounter
elastic res is ta nc e at ab ou t the 1-mm point.

Adjust threaded pin.

Adjust threaded pin.

15 rol l e r pr e s s ure 2.7.4 depending on th e m aterial Move cylin de r.
16 fabric deflector 2.7.5 So tight against the roller that the roller

can only just rotate freely.

Move fabric defl e c to r.

65

no.: subje ct section corr ect adjust men t co rre ction

foot height and foot lift

17 pressure bar 3.1

class 271/27 3:

distance of 0.5 mm between block and
traction bra c k et i f t he s ol e of th e f oo t i s i n
contact wit h t he ne ed l e p l at e.

class 272/274:

distance of 0.5 mm between block and
bush if the sole of the foot is in contact
with the needle plate.

Move pressure bar.

18 hinged foot 3.4 slight pres s ure on the material Adjust tors i on s pri n g.

upper-thread tensioner

19 upper-thread tensioner

release

4. play of 0.3 mm with upper-thread
tensioner closed

Move magnet.

20 thre ad take-up spring 4.1 spring tra v el:

keep upper thread under tension until the
tip of the ne ed le has entered the ma te r ial .
spring tensi o n: ab ou t 2 0 to 50 cN

Rotate bush.
Adjust tension bolt.

needle-bar height

21 nee dl e -ba r he i gh t 6. Set with gaug e. Move needle b ar.

shuttle adjustments

22 shuttle-drive ho usi n g 7.2 di s ta nc e be tw een shuttle and a dj u s ti n g

ring: 0.4 mm
distance between needle-plate surface
and thread-drawing plate:

small shuttle

: 3.7 mm

large shuttle

: 3.3 mm

Adjust hous in g
laterally.
Adjust stop screw in
base plate.

23 loop lift 7.1 In position A shuttle beak a t c e nt re of

needle and distance from shuttle beak to
furrow: 0.1 mm

Adjust shuttle.

24 bobbin-housing holder 7.3 distance of retaining tab and housing:

0.6

+ 0.1

mm

bend retaining tab

thread clipper

25 control cam 8.1 In non-opera ted state 0.2 to 0.3 mm

between control cam and ball-race.
In position D: the ball-ra c e m us t en ga ge i n
the control-cam indentation.

Move magnet.
Turn control cam.

26 fi xed bl a de 8.2 blade must make contact wi t h t he s c rew Move bl a de .
27 thre ad - gu i de pl a te or

adjusting plate

8.4 Must ma k e c o nt ac t wi t h t he s c rew.

0.5 mm betwee n t hr e ad -gu i de pl a te and
thread-drawin g p l at e, 0. 3 m m b et we en
thread-guide pl a te and hooked bla de .

Align thread-guide
plate or adj usting
plate.

28 hoo ked blade 8.5 Must ma k e c o nt ac t wi t h t he s c rew.

In at-rest position:
tip of hooked bl a de an d c u tt i ng ed ge of
the fixed bl ad e a t s a me l ev e l.
During the blade movement:
tip of the hooked blade and triangle
coincide in th e t hr e ad - gu i de pl a te .

Move or align hooked
blade.

29 cutting pressure 8.6 Cut rel i a bl y a t m i ni m um pre s s ure . Adjus t c ut ti n g-

pressure screws.

66

no. : subject se ction correct adju stment correction

class 271/272: thread retractor

30 thread retractor 9. Lever should make contact with the disc.

Retraction movement should take place
without hindrance

Adjust magnet.
Adjust wire.

class 272: edge cutter

31 position of the blade in

direction of se wi n g

10. Adjus t s t art of cut. Move blade hol d er.

32 position 10. Upper blade parallel to lower blade. Adjust block.
33 blade-height pos ition 10. Edge at same l ev e l as l o we r bl a de . Adjust blad e b ar.
34 pre s s ure 10. Move upp er b l ad e a ga i ns t l ow er blade. Adjus t t hre aded pin.
35 indicator bracket 10.1 Tip of the bracket at start of cut. Move bracket.

class 271: cross-cutter:

36 cutting depth 11. Front o f co unter-blade on ne ed l e p l at e.

Back edge parallel to base plate.

Adjust bearing block.

37 bla de l i ft 11. Reliabl y cut ma te r ial . Adjust connecting

rod.

38 blade-movement timing 11. Cutting movement when the feed process

is complete.

Turn worm.

39 cutting pressure 11. Cut reliably at minimum pressure. Adjust cutting-

pressure screw.

class 275: Differential foot-overfeed

40 advance adjustment 12.1 In position B no movement when overfeed

guide is swivelled.

Rotate thrust cam.

41 position of advance

lever

12.1 In positio n B the advance l eve r mu s t b e
vertical.

Rotate advance l e ver.

42 S ync h ron i s at i on

overfeed foot - fe ed
dog.

12.1.1 Synchronisation be tw ee n o ver f ee d f oo t
and feed dog.

Rotate guide.

43 lift adjustment 12.2.1 Lift cam and thrust cam groove-to-groove. Rotate lift cam.
44 lift 12.2.2 In position E 71 mm between

foot-attachm en t b l oc k and bearing bl ock .

Move bearing block.

45 ma xi mu m l i f t

2 mm

12.2.2 Position of lifting sha ft . Rotate lifting s ha ft .

46 position of overfeed

foot

12.2.3 parallel to needle pl at e Move trun ni o n i n

advance shaf t.

47 op era ti n g l e ver f or

extra thickn es s

12.3 Pin should be in contact with stop with
extra thickness set to 8 mm.

Rotate upper gui de .

67