Setting the needle thread tension
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 45
4. Move the needle thread regulator (2)
• Reduce needle thread tension: slide down
• Increase needle thread tension: slide up
5. Tighten the screw (1).
12.2 Setting the thread tensioning spring
Fig. 34: Setting 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 setting for the thread tensioning spring must be varied according to
the sewing material and the required sewing result.
1. Loosen the screw (4).
2. Turn the stop collar (1) to set the spring travel.
• Longer spring travel: turn counterclockwise
• Shorter spring travel: turn clockwise
3. Turn the tension disk (3) to set the spring tension.
• Greater spring tension: turn counterclockwise
• Lower spring tension: turn clockwise
Important
Be careful not to twist the stop collar.
4. Tighten the screw (4).
(1) - Stop collar
(2) - Spring
(3) - Tension disk
(4) - Screw
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