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2.
Pull off the hook cover (6) and fold it down.
3.
Remove the bobbin case upper section (2) with the empty
bobbin.
4.
Remove the empty bobbin.
Inserting a full bobbin
5.
Insert a full bobbin (3) 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 ruffing and thread
breaking.
Proper setting
If the tension of needle thread and hook thread is identical,
the thread interlace lies in the middle of the sewing material.
Adjust the needle thread tension so that the desired seam pattern
is achieved with the lowest possible tension.
Operating Instructions D669 M-TYPE DELTA - 00.0 - 10/2020
Operation
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