DURKOPP ADLER 991-210-10 Series, Service Instructions Manual

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Adjusting the bobbin case lifter
Service Instructions 911-210-10 - 00.0 - 06/2020 39
8.1 Adjusting the lifting gap
Order
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 case and the bobbin case support.
Fig. 26: Adjusting the lifting gap
To adjust the lifting gap:
1. Swivel up the machine head (

p. 14 ).
2. Loosen the screw (2).
3. Push the cover (3) downwards.
4. Loosen the threaded pin (1).
5. Set the bobbin case lifter (4) such that the gap between the nose of
the bobbin case and the bobbin case support is just big enough to allow
the needle thread to slip through without a problem.
Important
While doing so, ensure that the gap is not so big that the middle part of
the hook swings back and forth, hitting the bobbin case support.
6. Tighten the threaded pin (1).
7. Push the cover (3) upwards.
8. Tighten the screw (2).
(1) - Threaded pin
(2) - Screw
(3) - Cover
(4) - Bobbin case lifter
④
①
②
③