Technical data

Operating the sewing unit
Operating manual 743-221-01 version 01.0 - 09/2013
27
5.9 Setting the hook thread tension
The necessary hook thread tension is generated by the tension spring (1).
Fig. 11: Setting the hook thread tension
1. Insert a full bobbin in the upper bobbin case (3).
2. Thread in the hook thread.
3. Set the tension spring (1) at the adjustment screw (2).
Guide value: The hook thread tension should be about 20-30 g.
The bobbin case should slowly sink down through its own weight.
Caution: Danger of injury!
Turn off the main switch.
Adjust the tension spring (1) only with the sewing
unit switched off.
ATTENTION!
(1) - Tension spring
(2) - Adjusting screw
(3) - Upper bobbin case
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