Setting the opening of the middle part of the hook
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 41
11 Setting the opening of the middle part of the hook
Fig. 29: Setting the opening of the middle part of the hook
The hook pulls the needle thread between the nose of the bobbin housing
(3) and the grove in the throat plate (4).
At this moment, the opening hook (1) pushes the middle part of the hook
(2) to create a gap for thread.
When the hook tip is positioned under the opening hook (1), the opening
hook (1) must open to let the thread draw around this place as well.
For the smooth passage of the thread, the lifting gap and timing for lifting
must be set.
Error
Errors at the incorrect setting of the opening of the middle part of the hook:
• Thread breaking
• Forming loops at the bottom side of the stitch
•Noisy machine
WARNING
Risk of injury from moving parts!
Crushing possible.
Before you start setting the opening of the middle
part of the hook, turn the machine off.
(1) - Opening hook
(2) - Middle part of the hook
(3) - Nose of the bobbin housing
(4) - Throat plate groove
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