Errors In Sewing Process - DURKOPP ADLER D867 M-Type Delta Service Instructions Manual

23.3 Errors in sewing process

Error
Unthreading at seam
beginning
Thread breaking
Skip stitches
220
Possible causes
Needle thread tension is
too firm
Needle thread and hook
thread have not been
threaded correctly
Needle is bent or sharp-
edged
Needle is not inserted
correctly into the needle
bar
The thread used is
unsuitable
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
Service Instructions M-TYPE DELTA - 00.0 - 12/2019
Troubleshooting
Remedial action
Check needle thread tension
Check threading path
Replace needle
Insert the needle correctly into
the needle bar
Use recommended thread
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