Upper Thread Knife - Duerkopp Adler 558 Service Instructions Manual

36.2 Upper Thread Knife

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1
1
2
3
4
5
At the seam end (sewing drive disengaged) the cutting movement of
the upper thread knife occurs via the feed rod 2.
Caution Risk of Injury !
Pull the mains plug before adjusting.
Clearance
The Clearance between the tip of the upper thread knife 1 and the
needle lying at the right in its lowest position must be about 0.2 mm.
The upper thread knife 1 should cut through the upper thread loop
taken up by the right hook 6 only at the front of the hook.
Note !
Cutting the upper thread loop on both sides leads to a too short thread
end and thus to missing stitches at the seam beginning.
–
Bring the machine in the end position by turning the hand crank.
–
Turn the handwheel until it catches.
The needle is in its highest position.
–
Remove the clamping plates.
–
Loosen screw 3.
–
Through sliding the upper thread knifes 1 set the clearance
between knife point and needle accordingly.
–
Tighten screw 3 again.
Height
The height of the upper thread knife 1 is to be set so that it can move
as close as possible, but still unhindered, under the needle plate
bottom.
–
Loosen screw 5.
–
Set the height of the knife holder 4 accordingly.
To check the ease of movement swing the knife holder 4 by hand.
–
Tighten screw 5 again.
Continued on the next page !
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