Dürkopp Adler 755 B, Operating Instructions Manual

Page: 29 / 374

Operation
Operating Instructions 755 B, 756 B/F - 00.0 - 02/2021 27
8. Pull the hook thread through the slot (4) under the thread tensioning
spring (5).
 The bobbin must rotate in the direction of the arrow when pulling out
the thread (against the pulling direction).
9. Insert the bobbin case upper section (1) with the full bobbin into the
bobbin case bottom section.
10. Close the bobbin case retainer (2).
11. Pull the hook thread behind the thread-pulling knife (3) and tear it off.
12. Replace the fabric sliding plate.
13. Switch on the machine.
14. Start a new sewing process.
4.9 Thread tension
Adjusting the hook thread tension and the bobbin brake power
Fig. 12: Adjusting the hook thread tension and the bobbin brake power (1)
You use the leaf spring (3) to adjust the hook thread tension.
The braking spring (4) is used to slow down the bobbin.
To adjust the hook thread tension and the brake power of the bobbin:
1. Switch off the machine.
2. Disconnect the compressed air supply (

p. 31
).
(1) - Flat
(2) - Adjusting wheel
(3) - Leaf spring
(4) - Braking spring
①
④
③
②