Operation Manual

Operating instructions
38 Operating instructions 867 - 02.0 - 08/2015
Automatic
residual thread
monitor
For machines with automatic residual thread monitor:
If the hook thread needs to be replaced, the LED indicator
lamps (2) light up on the machine arm. The left light is for the left-
hand hook and the right light is for the right-hand hook.
Figure 16: Residual thread monitor
The bobbin plate has vision slots on one side.
Important: Insert the bobbin in the hook in such a way that the
vision slots (1) are at the top. Otherwise the residual thread mon-
itor will not work.
5.6 Thread tension
The tension of needle thread and hook thread determines the
position of the thread interlacing. If the tension of needle thread
and hook thread is high, the thread interlacing lies in the middle
of the material to be sewn.
Figure 17: Thread interlacing
+
–
2
1
(1) - Vision slot on the bobbin (2) - LEDs on the machine arm
1
2
3
(1) - Identical needle thread and hook thread tension
(2) - Hook thread tension higher than needle thread tension
(3) - Needle thread tension higher than hook thread tension