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Operating instructions
5.6.1 Adjusting the needle thread tension
The three adjusting wheels of the tensioning screws in triangular
arrangement determine the needle thread tension.
Fig. 12: Tensioning triangle for the needle thread
(1) - Pre-tensioner
(2) - Additional tensioner
Main tensioner
The main tensioner (3) determines the normal tension during sewing.
Correct setting
The main tensioner should be set as low as possible. The thread
interlacing should be exactly in the center of the material to be sewn.
Faults if the tension is too high
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•
Pre-tensioner
The pre-tensioner (1) holds the thread in position if main tensioner (3)
and additional tensioner (2) are open completely.
The pre-tensioner (1) also determines the length of the initial thread
for the new seam when the thread is automatically cut:
Short initial thread:
1. Turn the adjusting screw of the pre-tensioner (1) clockwise.
Long initial thread:
1. Turn the adjusting screw of the pre-tensioner (1) counterclock-
Operating manual 567 Version 01.0 - 01/2015
1 2 3 4
Curling up
Thread breakage
wise.
1
2
3
(3) - Main tensioner
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