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4.5 Setting the bobbin housing lifter
Fig. 24: Bobbin housing lifter
The hook pulls the needle thread through between the nose of the bobbin
housing (3) and the middle section holder (4).
The bobbin housing lifter (2) now pushes the bobbin housing (1) away so
that a gap appears for the thread.
If the hook tip is located below the bobbin housing lifter, then the bobbin
housing 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
lifting gap and the timing of opening have to be set.
Faults caused by an incorrect setting:
• Thread breakage
• Formation of loops on the bottom side of the seam
• Loud machine noise
4.5.1 Setting the lifting gap
Sequence
Always check the width of the lifting gap after making changes to the
needle thread size. The correct width of the lifting gap depends on the
thickness of the needle thread.
Proper setting
The needle thread slides through unobstructed between the nose of the
bobbin housing and the middle section holder.
28
①
②
(1) - Bobbin housing
(2) - Bobbin housing lifter
WARNING
Risk of injury!
Crushing injuries from moving parts.
Switch off the machine before setting the width of
the lifting gap.
Machine head
④
③
(3) - Nose of the bobbin housing
(4) - Middle section holder
Service Instructions 911-211 - 00.0 - 02/2015
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