Duerkopp Adler 579 Service Instructions Manual page 82

Thread breakage
82
Thread tension is set too tight
The material is not held properly
The material is not or too little
spread
Dependent on the material,
material weight and thread
used, the appropriate needle
size must be selected
The needle plate, the looper or
the spreader was possibly
damaged by the needle
Incorrect parts for the desired
E-group were possibly used,
such as e.g. needle plate,
looper, spreader, clamping
plates, upper/lower cloth clamps
At the change of the seam
width, the looping stroke was
not adjusted
The looper or spreader have
become misadjusted
Even if no misadjustment is to
be seen and the point listed
above brought no improvement,
check the adjacent points again
Needle and looper threads are
lmproperly threaded
The needle is bent, sharp-edged
or incorrectly inserted into the
needle bar
The thread used is knoty, hard
or too thick and thus unsuitable
The thread tensions are set too
tight for the thread used
Check the thread tension (see
Operating Instructions "Thread
Tension")
Check the cloth clamp pressure
(See "Cloth Clamp Pressure")
Check the spread
(See "Setting the Spread")
Change the needle size (see
Operating Instructions "Needles,
Threads and Gimps")
Attention!
After a change of the needle size,
the clearance of needle to looper
must be checked. (see Chapter
"Looper Clearance to the Needle")
Have the parts dressed by service
personnel
Check the sewing arrangement
parts in comparison to the
Arrangement Sheet
Set the looping stroke
(see Chapter "Looping Stroke")
Check the settings described in the
following chapters of the Service
Instructions:
"Setting the Positioning Points"
"Setting the Looping Stroke"
"Needle Bar Height"
"Looper Clearance to the Needle"
"Needle Guard"
"Spreader"
"Spreader Plate"
"Needle Plate"
"Thread Take-up Disk"
Check the threading path of the
needle and looper threads (See
Operating Instructions "Threading
the Needle Thread"/ "Threading the
Looper Thread"
Insert a new needle, insert the
needle correctly into the needle bar
Use a recommended thread (see
Operating Instructions Needle,
Threads and Gimps)
Check the thread tensions
(see Operating Instructions "
Thread Tensions ")