DURKOPP ADLER H-Type 969, Service Instructions Manual

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Adjusting the thread system
Service Instructions 969 - 01.0 - 12/2015 67
13 Adjusting the thread system
13.1 Setting the thread tensioning spring
The thread tensioning spring (2) tensions the needle thread before the
needle penetrates the material, so that the thread cannot slip under the
needle and be pierced by it.
If the overall thickness of the material is very thin or very thick, the setting
of the spring travel must be adjusted accordingly.
Thin material: normal spring travel (home position: horizontal)
Thick material: long spring travel (home position: vertically downward)
Standard setting
• The home position of the thread tensioning spring (2) is horizontal.
• When at its home position, the spring is turned by 90°.
Fig. 48: Setting the thread tensioning spring
Setting steps
1. Loosen the screw (1).
2. Turn the body (3).
3. Turn the sleeve (4) counterclockwise.
4. Hold the sleeve (4) and body (3) to prevent them from turning, and
tighten the screw (1).
WARNING
Risk of injury!
Crushing injuries from moving parts.
Switch the machine off before checking and
adjusting the thread system on the machine.
(1) - Screw
(2) - Thread tensioning spring (3) - Body
(4) - Sleeve
①
②
③
④