Setting the bobbin case lifter
52 Service Instructions 869-M PREMIUM - 00.0 - 07/2018
11 Setting the bobbin case lifter
Fig. 37: Setting the bobbin case lifter
The hook pulls the needle thread through between the nose of the bobbin
case (3) and the slot in the throat plate (4).
The bobbin case lifter (2) now pushes the bobbin case (1) away so that a
gap appears for the thread.
If the hook tip is located below the bobbin case lifter (2), the bobbin case
lifter (2) must open so that the thread can also slide past in that position.
So that the thread can slip through without a problem, the width of the
lifting gap and the timing of opening have to be set.
Disturbance
Disturbances caused by an incorrect setting of the bobbin case lifter:
• Thread breaking
• Formation of loops on the bottom side of the seam
• Loud machine noise
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before setting the bobbin
case lifter.
(1) - Bobbin case
(2) - Bobbin case lifter
(3) - Nose of the bobbin case
(4) - Slot in the throat plate
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