Errors In Sewing Process - DURKOPP ADLER 969 Service Instructions Manual

Troubleshooting

19.3 Errors in sewing process

Error
Unthreading at seam
beginning
Thread breaking
Missing stitches
Service Instructions 969 - 06.0 - 03/2019
Possible causes
Needle thread tension is too
firm
Needle thread and hook
thread have not been
threaded correctly
Needle is bent or sharp-edged Replace needle
Needle is not inserted
correctly into the needle bar
The thread used is unsuitable Use recommended thread
Thread tensions are too tight
for the thread used
Thread-guiding parts, such as
thread tube, thread guide or
thread take-up disk, are
sharp-edged
Throat plate, hook or spread
have been damaged by the
needle
Needle thread and hook
thread have not been
threaded correctly
Needle is blunt or bent
Needle is not inserted
correctly into the needle bar
The needle thickness used is
unsuitable
The reel stand is assembled
incorrectly
Thread tensions are too tight
Throat plate, hook or spread
have been damaged by the
needle
Remedial action
Check needle thread tension
Check threading path
Insert the needle correctly into the
needle bar
Check thread tensions
Check threading path
Have parts reworked by qualified
specialists
Check threading path
Replace needle
Insert the needle correctly into the
needle bar
Use recommended needle
thickness
Check the assembly of the reel
stand
Check thread tensions
Have parts reworked by qualified
specialists
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