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4.5 Setting the bobbin case lifter
Fig. 30: Setting the bobbin case lifter
(1) - Bobbin case
(2) - Bobbin case lifter
The hook pulls the needle thread through between the nose of the bobbin
case (3) and the middle section holder (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, the bobbin case lifter
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 lift-
ing gap and the timing of opening have to be set.
Disturbances caused by an incorrect setting:
• Thread breaking
• Formation of loops on the bottom side of the seam
• Loud machine noise
43
①
②
(3) - Nose of the bobbin case
(4) - Middle section holder
Service Instructions 911-211 - 02.0 - 10/2016
Machine head
④
③
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