Operating instructions

Operating instructions
20 Operating manual H867 Version 00.0 - Last updated: 01/2012
7.7.1 Adjusting the needle thread tension
The three tension-adjusting wheels determine the needle thread tension.
Figure 14: Adjusting the needle thread tension
The main tension (3) determines the normal tension during sewing.
The additional tension (2) increases the tension during sewing, e.g. for
thickened seams. The additional tension (2) is switched on and off using
the keypad.
• The additional tension (2) must always be selected lower than the
main tension (3).
In the basic position, the top of the adjusting wheel is flush with the screw
in the center.
To increase the tension:
• Turn the adjusting wheel clockwise.
To reduce the tension:
• Turn the adjusting wheel counterclockwise.
The preliminary tension (1) holds the thread in position if main
tensioner (3) and additional tensioner (2) are open completely.
Automatic
thread cutter
Note for machines with automatic thread cutter:
The preliminary tension (1) also determines the length of the initial thread
for the new seam:
Short initial thread:
• Turn the adjusting screw of the pre-tensioner (1) clockwise.
Long initial thread:
• Turn the adjusting screw of the pre-tensioner (1) counterclockwise.
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(1) - Pre-tensioner
(2) - Additional tensioner
(3) - Main tensioner