Duerkopp Adler 609 Service Instructions Manual page 14

10
Rule and control
When the thread lever is exactly at its UDC, the tension discs should
be closed.
UDC
As soon as the thread lever is about 2 mm behind the upper dead
center (UDC) point, the needle thread tension should be open to allow
a pulling of the thread.
This setting will guarantee a sufficient stitch formation despite regular
opening of the tension discs.
In the maximally open position, there should be 1.0 mm distance
between the tension discs 2.
–
Turn the handwheel until the thread lever is in position. Then keep
turning slowly and observe the needle thread tension.
–
Check the distance between the tension discs.
Adjustment of the distance
–
Loosen the set screw 1, while in the maximally-open position.
–
Move the thread tension bolts accordingly.
–
Tighten set screw 1 again.
Adjustment of the timing
–
Loosen screw 4 at the cam 3.
–
Turn the cam.
–
Tighten screw 4 again.