Thread Clamp (Thread Feeding Device); Errors, Cause And Remedy - DURKOPP ADLER 767 Service Instructions Manual

14.5 Thread clamp (Thread feeding device)

2

14.6 Errors, Cause and Remedy

With the thread clamp 2 and the relevant electronic components, the
thread is pulled downward and swallowed up while sewing on. In order
to avoid a threadbreakage (the thread can get jammed between the
sewing foot and material) the sewing foot is briefly relieved.
The strength of the relief depends on the position of the adjusting wheel
20 (stroke adjustment).
Higher stroke
Lower stroke
The correct function of the thread clamp 2 depends on the setting of the
potentiometer (the potentiometer is in general correctly set).
1
Error
The thread does not
get cut
Upper threadtoo short
The thread clampdoes
not clamp
The upper thread is not
pulled downward or the
thread breaks while
sewing on
The thread-pulling
knife does not catch
the thread
The thread-pulling
knife will not be
takento its catching
position
Hint!
The regrinding of the counter knife will result in lengthening
the threads cut!
stronger relief (thicker material)
weaker relief (thinner material)
Cause and Remedy
- Check parameter
- Knife dull or faulty
- Cutting pressure pulling-knife/counter-knife
- Pulling-knife position
- Trimmer disc: Check the height of the thread-pulling
knife to the counter-knife
- Pretension too strong
- Dirt particle in the thread guide
- Check parameter
- Check connection to the PCB
-Check parameter
-Check the stroke adjustment
-Sewing foot lift too slow
-Check throttle
-The thread clamp does not clamp
-Check connection to the PCB
- Check the position of the trimmer disc
- Thread-pulling knife not smoothly moving
- Thread-pulling knife not in output position
- Check setting
- Thread-pulling knife too high
- Magnet not set properly
- Too strong pressure of the counter-knife
/ - Trimmer disc too early
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