Dürkopp Adler 667 PREMIUM, Service Instructions Manual

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Setting the needle thread tension
Service Instructions 667 PREMIUM - 03.0 - 01/2018 57
• Reduce needle thread tension: slide to the left
• Increase needle thread tension: slide to the right
4. Tighten the screw (1).
11.2 Setting the thread tension spring
FIg. 41: Setting the thread tension spring
The thread tension 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 tension spring does not contact the stop until the needle eye
has plunged into the sewing material.
The setting for the thread tension spring must be varied according to the
sewing material and the required sewing result.
To set the thread tension spring:
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
Do not twist the stop collar in doing so.
4. Tighten the screw (4).
(1) - Stop collar
(2) - Spring
(3) - Tension disk
(4) - Screw
①
②
③
④