Operation
Operating Instructions 650-10 - 03.0 - 08/2016 27
Change the hook thread bobbin as follows:
Removing an empty bobbin
1. Push the hook cover (2) downwards.
2
. Move the needle to the top dead center.
3. Lift the bobbin case retainer (1).
4. Remove the bobbin case upper section (7) with the bobbin (3).
5. Remove the empty bobbin (3) from the bobbin case upper
section (7).
Inserting a full bobbin
1. Insert the full bobbin into the bobbin case upper section (7).
2
. Feed the hook thread through the slot (4) under the tensioning
spring (5) into the hole (6).
3. Pull the hook thread approx. 5 cm out of the bobbin case (7).
4. The bobbin must rotate in the direction of the arrow when
pulling out the thread.
5. Insert the bobbin case (7) again.
6. Push the hook cover (2) upwards.
4.7 Thread tension
Together with the bobbin thread tension, the needle thread tension
influences the seam pattern.
The needle thread tension is defined by the pre-tensioner, the
mai
n tensioner and the additional tensioner.
Proper Setting
The main tension (1) should be set as low as possible.
The thread interlacing should be exactly in the middle of the
material being sewn.
With thin sewn material, excessive
thread tension can lead to
undesired gathering and thread breakages.
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