Operation Manual

8
3.2.1
Threading of needle thread
Pass the needle thread according to fig. 9.
- through the reel stand,
- from right through the thread guide O,
- from right through the upper hole in the thread guide L,
- from left through the middle hole of the thread guide L,
- from right through the lower hole of the thread guide L,
- counter-clockwise around the adjustable needle thread pre-tension K
- back through the lower hole of the thread guide I,
- clockwise over the thread guide I,
- counter-clockwise in the adjustable needle thread main tension H, clockwise in the thread guide F,
up to the hook,
- from outside below the pulling spring D,
- from below behind the thread guide E,
- from below behind the adjustable thread guide G,
- from right through the lower hole in the thread take-up lever,
- from above through the thread guide E (if available),
- behind the thread guide C,
- through the thread guide R,
- to the hook through the needle and advance some 8,0 cm
Thread tension
3.3
3.3.1
Adjusting the thread tensions
Rule 1:
A good seam pattern with regularly tightened stitches is often obtained only by regulating the needle
thread tensioning elements, principally by the needle thread main tension H.
Indication 1:
When adapting the needle thread tension, loosen first the needle thread pre-tension K and regulate only
the needle thread main tension H, until the bobbin thread and the needle thread are locked in the material,
fig. 5.
The needle thread pre-tension should be regulated finally, because it is always lower than the main
tension of the needle thread.
Rule 2:
In case of a general adjustment of the thread tensioning elements, adjust first the bobbin thread tension P
for a low value and adapt it then to the needle thread tension.
Indication 2:
For a lockstitch seam, the low bobbin thread tension can already be influenced during the winding
process by the adjustable bobbin winder pre-tension P. The bobbin thread pre-tension P should be
adjusted so that the bobbin thread is wound regularly with the lowest possible tension.