Duerkopp Adler 559 Service Instructions Manual page 76

Description of fault
Needle breakage
No reliable seam beginning
or unthreading respectively
Faulty feed of the fabric
support plate
Faulty rotation of the sewing
works
72
Possible cause
The needle size is unsuitable
for the material or the thread.
The needle hits the fabric
clamps
When changing the seam width
the upper fabric clamps have
not been set apart or not wide
enough.
When changing the seam width
the lower fabric clamps have
not been exchanged.
The remaining tension is too
tight for the needle thread so
that the thread at the seam
beginning is too short for the
next sewing start.
The fabric support plates
collides with other components.
The fabric support plate is only
heavily movable when the
machine is switched off.
The toothed belts are
insufficiently tightened.
Toothed belts and toothed lock
washers are soiled.
The sewing works collides with
other components.
The sewing works is only
heavily rotatable when the
machine is switched off.
The adjustable rings at the
looper support drive or at the
needle bar drive are pressed
too tight against the driving
levers or the yoke.
Error elimination
Change the needle size.
Check the subclass on the control
panel.
Set the upper fabric clamps apart as
far as required.
Insert lower fabric clamps matching
the sewing equipment.
Readjust the remaining tension
(see Operating Instructions "Thread
tension").
Check the motion of the fabric
support plate at low speed to find
possible collisions.
Check all components belonging to
the drive of the fabric support plate.
Retighten toothed belts or replace
them, if necessary.
Clean the toothed belts and toothed
lock washers. Replace the toothed
belts, if necessary.
Check the motion of the sewing
works rotation at low speed to find
possible collisions.
Check the adjusting rings at the
looper support drive and at the
needle bar drive and set a slight
clearance, if required (see chapter
"Adjusting the looping stroke",
"Needle bar height", "Spreader
plate").