Setting The Thread Tensioning Spring - Dürkopp Adler 806N-111-10 Service Instructions Manual

5.4 Setting the thread tensioning spring

Fig. 49: Setting the thread tensioning spring
(1) - Thread tensioning spring
(2) - Tension bolt
(3) - Socket
Proper setting
The thread tensioning spring (1) should hold the needle thread tensioned
at least until the tip of the needle penetrates the sewing material.
Correction of the spring travel
To correct the spring travel:
1. Loosen the screw (4).
2. Turn the socket (3).
 The thread tensioning spring (1) must pre-tension the needle thread
3. Re-tighten the screw (4).
Correction of the spring force
To correct the spring force:
1. Loosen the screw (5).
2. Set the tension value by turning the tension bolt (2).
 The tension of the thread tensioning spring must range between
3. Tighten the screw (5).
74
①
②
almost until the tip of the needle plunges into the sewing material.
20 and 50 cN ( 1 cN = 1 g ), depending on the type of the yarn and
the sewing material.
(4) - Screw
(5) - Screw
Service Instructions 806N-111-10/806N-121-10 - 00.0 - 09/2023
Machine head 121
③ ④ ⑤