Duerkopp Adler 669 Premium, Operating Instruction

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Operation
32 Operating Instructions 669 PREMIUM - 00.0 - 11/2016
Inserting a full bobbin
5. Insert the full bobbin into the bobbin case upper section (2).
6. Feed the hook thread through the slot (4) under the tension
spring (5) into the hole (1).
7. Pull the hook thread approx. 5 cm out of the bobbin case upper
section (2).

The bobbin must rotate in the direction of the arrow when
pulling out the thread.
8. Insert the bobbin case upper section (2) again.
9. Close the hook cover (6).
4.8 Thread tension
Together with the hook thread tension, the needle thread tension
influences the final seam pattern. With thin sewing material,
excessive thread tension can lead to undesired gathering and
thread breakage.
Proper setting
If the tension of needle thread and hook thread is identical, the
thread interlacing lies in the middle of the sewing material.
Set the needle thread tension so that the desired seam pattern is
achieved with the lowest possible tension.
Fig. 13: Thread tension
(1) - Identical needle thread and hook thread tension
(2) - Hook thread tension higher than needle thread tension
(3) - Needle thread tension higher than hook thread tension
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