Adjusting the needle thread tension
Service Instructions M-TYPE DELTA - 00.0 - 12/2019 73
11.2 Adjusting the thread tensioning spring
The thread tensioning spring holds the needle thread under tension from
the top dead center of the thread lever up to the point when the needle eye
plunges into the sewing material.
Proper setting
The thread tensioning spring does not contact the stop until the needle eye
has plunged into the sewing material.
The adjustment for the thread tensioning spring must be varied according
to the sewing material and the required sewing result.
11.2.1 Adjusting the spring travel
The spring travel set at the factory is 17 mm between the thread guide (3)
and the stop (2).
Fig. 59: Adjusting the spring travel
To adjust the spring travel:
1. Loosen the screw (3).
2. Turn the stop (2) to adjust the spring travel.
• longer spring travel: Turn the stop (2) counterclockwise
• shorter spring travel: Turn the stop (2) clockwise
3. Tighten the screw (3).
(1) - Thread guide
(2) - Stop
(3) - Screw
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