Duerkopp Adler 558 Service Instructions Manual page 57

6 7 8
1
2
3
4
5
–
Loosen the lock nut and set the clearance between the edge of the
latch 2 and the pin 3 with the setting screw 4.
The clearance must be 3 mm.
–
Press lever 8 up until touching.
–
Slowly turn the hand crank farther until the operating edge 1 is
exactly at the latch tip.
–
Tighten screw 7 again.
Check axial play and ease of swinging.
If necessary press against lever 5 and set lever 8 tight.
–
Screw the setting screw 6 in until the knife edge extends 1 mm
over the needle plate edge.
Too great a swing of the upper thread knife can lead to damage of
the underthread guided in the left hook.
–
With the hand crank turn the machine until just before the
buttonhole end.
Turn the handwheel farther until it catches.
In this position there must the clearance X between the latch tip
and the operating edge must be felt.
–
If necessary reset the clearance with setting screw 4.
Check if the position knife edge and needle plate edge is all right
when the operating edge 1 lies exactly on the latch tip.
If not correct with the setting screw 6.
57