Summary Of Adjustments - Duerkopp Adler 743-221 Service Manual

6.

Summary of adjustments

no.: subject
arm-shaft crank
1 position of adjusting disc
upper-thread tensioner
2 upper-thread tensioner
release
3 thread take-up spring
needle-bar height
4 needle-bar height
shuttle settings
5 shuttle-drive housing
6 loop lift
7 bobbin-housing holder
residual-thread monitor
8 light barrier
bobbin winder
9 filling level of bobbin
position sensor
10 positioning
thread clipper
11 position of the thread
clipper
12 fixed blade
13 moving blade
14 cutting pressure
36
IMPORTANT !
Adjustments to the sewing machine must be carried out in the order
given.
section correct adjustment
2.3 groove and notch A in line
2.4 distance of tension discs: 1mm when closed
2.5 spring travel:
keep upper thread under tension until tip of
needle
has penetrated material
spring tension: about 20 to 30 cN
2.7 set with gauge
2.7.2 distance between shuttle and bush 0.4 mm.
distance between slide surface and
thread-drawing plate 3.8 mm.
2.7.1 in position A shuttle beak at centre of needle
and distance from shuttle beak to furrow: 0.1
mm
2.8 distance from retaining tab to housing: 0.6
mm
2.9 reflection on turning empty bobbin
2.10 to 0.5 mm beneath bobbin rim
2.11 move to position C after sewing process
3.1 moving blade must be able to move freely in
shaping-module slit while thread is being cut
3.1.1 must protrude 1.5 mm from body of clipper
3.1.1 must protrude 2 mm from body of clipper
3.1.1 cut safely with minimum pressure
correction
rotate cogged-belt pulley
move cylinder
rotate bush
adjust tension bolt
move needle bar
adjust housing laterally
adjust stop screw in
base plate
adjust shuttle
+0.1
bend retaining tab
align light barrier
rotate switch cam
rotate position-sensor
ring
align thread clipper
move blade
move blade
adjust pressure screw