Counter-Knife And Lower Thread Clamp - Duerkopp Adler 868 Service Instructions Manual

2.14.5

Counter-knife and lower thread clamp

1
3
Caution: Risk of injury !
Turn the main switch off !
Check and set the counter-knife and lower thread clamp only
with the sewing machine turned off.
Standard checking
The thread is to be trimmed safely with as little pressure as possible. A
low trimming pressure keeps the knife wear low!
If the trimming pressure is too high, this can lead to the counter-knife's
breaking!
It must be possible to safely trim two of the thickest sewing threads
simultaneously.
Turn the handwheel until the thread-pulling knife 1 can be swung
–
out.
Swing out the thread-pulling knife 1 manually.
–
Push the operating lever 6 to the right against the control cam 4.
Insert two threads to be trimmed into the thread-pulling knife 1.
–
Continue turning the handwheel until the knife 1 has swung back.
–
–
Check whether the sewing threads have been trimmed properly.
Pull the threads out of the lower thread clamp 25 and, in doing so,
–
check the clamping effect.
If the clamping effect is too high or too low, the lower thread clamp
must be reset again.
ATTENTION !
If the pressure of the counter-knife 2 is set to high this leads to an
excessive knife wear and breakage.
A wrong lower thread clamp 25 setting can lead to problems with the
sewing start.
20 17 16 21
22
25
2
19
18
15
GB
53