Adler 743-221 Service Manual
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Part 4: Service manual, cla ss 743-221
1. General
2. Adjusting the upper part of the machine
2.1 Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Description and adjustment of integral adjusting disc . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Arm-shaft crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Upper-thread tensioner release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Thread take-up spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6 Needle-bar height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.7 Shuttle settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.7.1 Loop lift and distance between shuttle beak and needle . . . . . . . . . . . . . . . . . . . . . . 11
2.7.2 Shuttle-drive housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.8 Bobbin-housing holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9 Light barrier of residual-thread monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.10 Bobbin winder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.11 Position sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.12 Replacing the right-hand arm-shaft bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.13 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.13.1 Shuttle lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Adjusting the sewing machine
3.1 Thread clipper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.1.1 Fitting and removing the blades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.1.2 Replacing the piston . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2 Folding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.2.1 Retraction of folding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.2.2 Angle adjustment, switch point b03 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3 Transport carriage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.3.1 Overrun protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.4 Shaping module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.4.1 Shaping-module guide roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.4.2 Shaping-module pressure cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.3 Shaping-module closing movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.4.4 Adjusting the shaping module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4. Maintenance unit
5. Maintenance
6. Summary o f ad j ust m en t s
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
1. General
This service manual describes the adjustment of the
sewing machi n e i n an ex p ed i en t s e qu en c e.
IMPORTANT !
Various adjustments are mutually interdependent.
The adjustme nt pr o c ess m us t th er e fo re be carried out i n th e o r de r
given.
IMPORTANT !
The activities described in this Service manual may only be carried out
by specialists or by persons with appropriate training.
Danger of breakage
Before the sewi n g m ach i ne i s r e-s t art ed fo l l ow i ng di sm an tl i n g t he
necessary adjustments must be carried out as specified in this service
manual.
Avoidance of damage to the material clamps:
The sewing machine must never be operated without material. This
also applie s to ad j ustment work and f un c ti o n-t es t i ng .
Adjustment work on stitch-forming components
For all adjus t me nt s of s ti t c h-forming components a flawles s n ew
needle must be fitted.
743-221
model
Caution: danger of injury
Before all repair, conversion and maintenance work:
–
turn off the main switch
–
isolate the s ew i ng ma c hi n e f r om th e p ne um at i c s up pl y.
Exception:
Adjustment work which is carried out with testing, adjustment or
sewing programs of the control device.
Adjustment work and function-testing with the sewing machine
running
–
When carryin g o ut ad j ust me nt work and functio n- t es t ing wi t h t he
machine runn i ng , c o mp l y wi t h a l l s af et y me as u res a nd ta k e t he
utmost care.
Pedal
–
In the sewi ng programs the sew i ng ma chi n e c a n b e s t ar t ed by
inadvertently depressing the pedal.
IMPORTANT !
All colour- m ark e d c o mp on en ts a r e f ac t ory - se t. These settings sh ou l d
only be alter e d b y spe c i al i sts.
3
2. Adjusting the upper part of the machine
2.1 G auges
12
With the adjustment gauges listed below the sewing machine can be
precisely adjusted and tested.
item adjustment order no. use
gauge
345
1
2
3
4
5
adjusting pin 9301 022608 lock sewing machine in positions A -
gauge 0935 107077 al i g n t ran s po r t c a rr i ag e, c he ck r ef ere nc e po i nt , guide
roller and needle centre
feeler gauge 0933 080200 c he ck an d a dj u s t g ui d e r o l ler
gauge 0935 107071 align needle-bar height and shuttle-drive housing
sleeve 0935 107090 al i g n re s i du al -t hr e ad mo ni t or
F
4
2.2 Descripti on and adjustment of integral adjusting disc
3 4
1
2
3
The sewing ma c hi n e c a n b e l o ck ed i n a l l ad j ustment positio ns w i th
locking pin 3 and the integral adjusting disc 4 on the cogged-belt
pulley of the arm shaft.
The adjusting disc has 6 notches which are marked on the
handwheel 1 by th e l e tt ers A, B, C, D, E and F. In conjunction with
marking 2 the letters indicate the position of the notches in which the
machine can be l o c ked wi t h p i n 3 .
Notch A (loop-lift position) is deeper than the other notches.
A
B
E
F
D
C
The following adjustments can be carried out in the various positions:
A
adjusting di s c with respect to the groove in the arm-shaft crank,
belt wheel, l oo p l ift, distance o f s h ut tl e be ak f rom needle
B
- no function -
C
2nd needle position (raised thread-lever position)
D
- no function -
E
needle-bar h ei g ht
F
- no function -
5
2.3 Arm-shaft crank
1
2
3
4
X
Regulation and inspection
The groove 4 and notch A of the adjusting disc on the cogged-belt
pulley must coincide on the
–
Lock the arm shaft with a loc k i ng pi n or a 5 m m Ø p i n i n th e
arm-shaft g roo v e 4 ( th rough hole 3).
–
It must be possible to pass the locking pin through the hole 2 in
position A into the integral adjusting disc.
X - Y
line.
Y
IMPORTANT !
Adjustments carried out with the adjusting disc will only be correct if
the disc itself has been adjusted as described below.
If the arm shaft is moved, all subsequent settings must be checked
and adjusted if necessary.
Caution: danger of injury
Turn off the main swit ch.
The positio n o f t he ar m shaft may only be ad j usted with the sewing
machine swi tc h ed off.
Adjustment
–
Remove bobbin-winder cover 1.
–
Undo the first screw of the cogged-belt pulley 6 from above with
the Allen key 5 through the hole.
–
Lock cogged-belt pulley in position A with the locking pin.
–
Undo second s c rew of cogged-bel t pu l l ey 6 .
–
Insert a 5 mm- th i ck pi n i nt o t he r i g h ol e 3 a nd al l o w it to engage in
the arm-sha ft gr o ove 4 by turning the ha nd wh ee l .
–
Retighten the screws on the cogged-belt pulley 6.
The cogged- be l t p ull e y mu s t n ot be ax i a l l y s hi f te d.
6
5 6
2.4 Upper-thread tensi oner release
1
2
3
Regulation and inspection
The cylinder 2 must open the tension discs 1 by about 1 mm.
When closed, the tension discs 1 must keep the upper thread securely
under tensio n.
–
Turn t he
–
Press "STOP" button.
The program is activated.
–
Turn
Switch on solenoid valve s24 by pressing the "Σ" button.
The upper-thread tensioner opens.
–
Check distance between tension discs 1.
Caution: danger of injury
Turn off the main swit ch.
The upper-thread tensioner release may only be adjusted with the
motor-protection s w itc h tu rne d off.
Adjustment
–
Slightly un do s cr ew 3.
–
Move cylinder 2.
With the upp er- t hre ad tensioner open there should be a distance
of 1 mm between the tension discs 1.
The distanc e ca n be checked wi th a g au ge (s ee s ec t i on 2. 1 n o. 3) .
–
Retighten s cr e w 3 .
"program"
"program"
switch to 64.
switch to 24.
7
2.5 Thread take-up spri ng
3
1
2
4
5
20...30 cN
Regulation and inspection
The thread take-up spring 1 must keep the upper thread under tension
at least until the tip of the needle has penetrated the material.
Caution: danger of injury
Turn off the main swit ch.
The thread take-up spring may only be adjusted with the sewing
machine swi tc h ed off.
Adjusting the spring travel
–
Undo screw 4.
–
Rotate bush 3.
The spring 1 m us t pr e - te nsi o n t he upper thread a t least until the ti p
of the needl e p en et r at es t he ma te r i al.
–
Retighten screw 4.
Adjusting the spring tension
–
Undo screw 5.
–
Adjust the te ns i o n b y rotating tensio n b ol t 2.
Depending on the material and thread the tension of the thread
take-up spring must be between 20 and 30 cN (1 cN = 1 g).
6
The tension i s me asu r ed at th r ea d g ui d e 6 .
The thread i s dra wn parallel to th e a r m s h af t.
–
Retighten screw 5.
8
2.6 Needle-bar hei ght
1
2
3
4
5
Regulation and inspection
Adjustment and inspection are carried out with gauge 1.
Caution: danger of injury
Turn off the main swit ch.
The needle-b ar h ei g ht may only be adjus t ed wi t h the sewing mac hi n e
switched off.
Adjustment
–
Remove shaping module 2.
–
Remove casing 4.
–
Undo light ba rr i er 5 and thread clipp er 3 an d l a y th em on th e o i l
reservoir.
–
Undo screws 6 on th e s l i d e p l at e a nd r em ove the slide plat e.
IMPORTANT !
The centring screws 7 must not be rotated.
These are used to align the slide plate to the needle.
There are 2 shi m s be tw ee n t he slide plate an d t hre ad clipper.
6 7 7 6 6
6 6 6 6
9
10
8
1
9
–
Place gauge 1 on th e base plate.
–
Unscrew safety shutter and he ad cover.
–
Undo clampin g sc re w 9 .
–
Lock the sewing machine in position E.
–
Lower the needl e ba r 8 o nt o t he gauge 1.
The pin of gauge 1 must fully penetrate th e needle bar.
–
Tighten needle-bar attachment screw 10.
The needle- at ta c hm en t s cr e w 1 0 must be aligne d i n pa ral l e l to th e
arm shaft and po i nt to the rear (toward s th e h an dw he el ) .
–
Replace all th e p ar t s wh i c h h ave be en r em ove d.
IMPORTANT !
When fitting the thread clipper place both shims between the
thread clipper and slide plate.
10
2.7 Shuttle settings
2.7.1 Loop lift and distance between shuttle beak and needle
0,1 mm
2
3
1
4
Regulation and inspection
The loop lif t i s the travel of t he ne ed l e b ar from bottom dead c en tr e to
the point at which the shuttle beak is at the centre of the needle.
The loop lift is 1.8 mm.
–
Lock the machine in position A.
The shuttle b ea k 1 m us t be at th e c e nt r e o f t he ne ed l e.
The distanc e b et we en th e s h ut tl e be ak 1 an d the needle must be
0.1 mm.
Caution: danger of injury
Turn off the main swit ch.
The loop lift and the distance between the shuttle beak and needle
may only 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 shaping module and slide plate (see section 2.6).
Fit new needl e.
–
Undo first a ttachment screw 3 of shuttle 4.
–
Lock sewing machine in position A.
–
Undo secon d a tt ac h me nt s cr ew 3 o f sh uttle 4.
–
Place shut tl e be ak 1 at c en tre of needle.
The distanc e b et we en th e s h ut tl e be ak 1 an d the furrow of th e
needle must be 0.1 mm.
In this position there is a distance of about 0.4 mm between the
shuttle 4 an d t he bu s h 2 .
If the dista nce of 0.4 mm is not ac h i eved, the shuttle - dri v e ho us i n g
should be adjusted accordingly (see section 7.2).
–
Retighten 2 at ta c hm en t s c re w s 3 of the shuttle 4.
–
Replace all the parts which have been removed.
11
2.7.2 Shuttle-drive housing
1
3,8 mm
2
3
Regulation and inspection
The shuttle-drive housing 4 is factory-aligned.
It may only be altered in exceptional circumstances.
With the shut tl e - dri v e ho us i n g correctly alig ne d there must be a
distance of 0 .4 mm between the s hu tt l e a nd th e a dj u s ti n g ri n g
(see section 2.7.1).
The distanc e b et we en th e s l i d e-plate surface a nd the thread-drawi n g
plate 3 is 3.8 mm.
4 5
Caution: danger of injury
Turn off the main swit ch.
The shuttle-drive housing 4 may only be adjusted with the sewing
machine swi tc h ed off.
Adjustment
–
Remove the sha pi n g m odule and slide plate (see sec ti o n 2 .6 ) .
–
Unscrew locking screw 5.
Beneath the locking screw there is a stop screw.
–
Adjust stop screw.
The distanc e be tw ee n t he slide-plate s urface and the
thread-drawin g p l at e 3 i s 3. 8 m m
The distance is checked with gauge 1.
–
Retighten locking screw 5.
–
Undo screws 2 of the shuttle-drive housing.
–
Move shuttle - dri v e ho us i n g 4 .
There must be a distance of 0.4 mm between the shuttle and the
adjusting ring (see section 2.7.1).
–
Retighten screws 2 of the shuttle-drive housing.
–
Check the distance of the shuttle beak to the needle and adjust if
necessary (see section 2.7.1).
12
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