14.5 Thread clamp (Thread feeding device)
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 stronger relief (thicker material)
Lower stroke weaker relief (thinner material)
The correct function of the thread clamp 2 depends on the s etting of the
potentiometer (the potentiometer is in general correctly set).
14.6 Errors, Cause and Remedy
Error Cause and Remedy
The thread does not
get cut
- 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
Upper threadtoo short - Pretension too strong / - Trimmer disc too early
The thread clampdoes
not clamp
- Dirt particle in the thread guide
- Check parameter
- Check connection to the PCB
The upper thread is not
pulled downward or the
thread breaks while
sewing on
-Check parameter
-Check the stroke adjustment
-Sewing foot lift too slow
-Check throttle
-The thread clamp does not clamp
-Check connection to the PCB
The thread-pulling
knife does not catch
the thread
- 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
The thread-pulling
knife will not be
takento its catching
position
- Magnet not set properly
- Too strong pressure of the counter-knife
Hint!
The regrinding of the counter knife will result in lengthening
the threads cut!
63
GB
21
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