2.12 Thread cutter
2.12.1 Sequence of functions
Checking the thread cutting process
–
When switching on during the display of the Dürkopp Adler Logo
press the key "
F2
".
–
Press the key "I".
The adjustment menu will appear.
–
Select the "
Sewing test
" function.
–
Lower the sewing head by the function "
Lowering/lifting the
sewing head
".
–
Activate the "
knife
" function.
Deactivate the functions "
Needle upper position
" and "
Needle
lower position
".
–
Start the sewing process by the key "
F2
".
–
Press the key "
F3
".
The thread cutting process will be started.
Following the release of the thread cutting process, the needle will
stop in the 1
st
position. The drive will be stopped for a moment (Pos. 1).
The magnet will press the roller lever 1 against the lowest point of the
control cam 2. The thread knife 4 will be moved completely away from
the counter-knife.
The sewing machine will run at a speed of 150 min-1.
When the control cam 2 of the thread pulling knife 4 is moved towards
the counter-knife, the thread pulling knife moves during the 1
st
movement phase towards the bobbin case and stops short before its
lug. This ensures that the thread pulling knife remains outside the
movement range of the bobbin case lifting finger.
At the onset of the 2
nd
movement phase, the thread pulling knife
catches the hook thread and the needle thread (Pos. 2a). The thread
tensioner is lifted. During the further process, the thread pulling knife
unwinds the thread from the reel. Short before the thread take-up lever
is in its upper position, the threads are cut and the hook thread is
clamped (Pos. 2b).
As soon as the upper position of the thread take-up lever and
consequently the 2
nd
position is reached, the motor stops. The magnet
for the thread tensioner lift and the magnet for the thread cutter will be
switched off.
1
2
4
3
Pos. 1)
1
2
4
3
Pos. 2a)
1
2
4
3
Pos. 2b)
33
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