Dürkopp Adler 52 i Series Service Instructions Manual page 47

Thread mechanism
Pic. 33: Seřízení napínače niti
(7) - Bolt
(8) - Stop
3. Loosen the screw (9).
4. Turn the bolt (7) by the screwdriver clockwise until the spring hits the
5. Tighten the screw (9).
6. Mount the tensioner (5).
7. Turn the whole tensioner (5) so that the spring end (3) is in the same
8. Tighten the screw (6).
9. Sew several stitch and check the spring proper setting.
Service Instructions 52Xi, 52Xi-75 - 00.0 - 11/2021
⑦
stop (8), then continue turn approximately 80° - 90° (according to the
thread), to achieve the prescribed pre-tension.
height as the guide top edge (4).
⑧ ⑨
(9) - Screw
45