Operating instructions

Operating instructions
Operating manual H867 Version 00.0 - Last updated: 01/2012 19
• Pull the looper thread under the looper spring (3).
• Guide the looper thread through the 2nd looper slot (5).
• Press the looper flap (1) down.
• Insert the looper thread through the looper flap guide (4).
• Turn the handwheel until the looper thread comes up.
• Pull the looper thread and needle thread back together and hold them
tight when sewing starts, to avoid jamming the threads.
Automatic
residual thread
monitor
Note for machines with automatic residual thread monitor:
If the looper thread needs to be replaced, the LED indicator lamps (1) light
up on the machine arm. The left light is for the left-hand looper and the
right light is for the right-hand looper.
Figure 12: Residual thread monitor: LEDs on the machine arm and vision slot on the bobbin winder
The bobbin plate has vision slots on one side.
• Insert the bobbin in the looper in such a way that the vision slots (2)
are at the top.
Otherwise the residual thread monitor will not work.
7.7 Adjusting the thread tension
The tension of needle thread and looper thread determines the position of
the thread interlacing.
If the tension of needle thread and looper thread is high, the thread inter-
lacing lies in the middle of the material to be sewn.
Figure 13: Thread interlacing
+
–
w
q
(1) - LEDs for the residual thread monitor
(2) - Vision slot on the bobbin
q
w
e
(1) - Identical needle thread and looper
thread tension
(2) - Looper thread tension higher than
needle thread tension
(3) - Needle thread tension higher than
looper thread tension