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Machine head 111
4.11 Thread cutter
4.11.1 Checking the function sequence
Fig. 33: Checking the function sequence
(1) - Roller lever
(2) - Control cam
Following the release of the thread cutting process, the drive will stop briefly
after the needle has been positioned. The magnet will press the roller
lever (1) against the lowest point of the control cam (2). The thread-pulling
knife (4) will be moved completely away from the counter blade (3).
The sewing machine operates at a cutting speed of 150 min
When the control cam (2) of the thread-pulling knife (3) is moved towards
the counter blade (4), the thread-pulling knife moves, during the 1
ment phase, towards the bobbin capsule and stops shortly before reach-
ing its lug. This ensures that the thread-pulling knife (3) remains outside
the movement range of the bobbin capsule lifter.
At the onset of the 2
the hook thread and the needle thread. The thread tensioner is lifted.
From this moment onwards, the thread-pulling knife will unwind the thread
from the reel. Shortly before the thread lever reaches its upper position,
the threads are cut, and the hook thread is clamped.
As soon as the upper position of the thread lever and, consequently, the
2
lift and the magnet for the thread cutter will be switched off.
Service Instructions 806N-111-10/806N-121-10 - 00.0 - 09/2023
①
nd
nd
position is reached, the drive stops. The magnet for the thread tension
④
②
(3) - Thread-pulling knife
(4) - Counter blade
movement phase, the thread-pulling knife catches
③
-1
.
st
move-
55
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