Setting The Needle Thread Knife - Duerkopp Adler 579 Service Instructions Manual

22. Setting the Needle Thread Knife

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Caution Risk of Injury!
Set the needle thread knife only in the "Safe Stop" position or with the
machine turned off.
Rule and Control
After sewing, the cutting motion of the needle thread knife occurs. The
precise cutting moment is established at the controls.
While turning in the direction of rotation, the spreader stop should not
touch the knife holder.
The needle thread knife should cut through the needle thread loop
taken up from the right looper only at the front side of the looper.
Both-sided cutting of the needle thread loop results in too short a
thread end and thus missing stitches at the seam start.
The needle thread knife in the right end position should not be in the
thread area nor touch the spreader stop.
There must be a clearance of approx. 0.2 mm between the needle and
knife.
In the cutting position, the knife must move approx. 1 mm above the
edge 1.
Move the knife manually and check if all of the rules listed above
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are met.
Correction of the stop screws
Loosen stop screws 4 and 5.
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Set the stops according to the rule.
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Tighten screws 4 and 5.
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Setting the height
Loosen screw 3.
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Set the height of the knife holder 2 accordingly.
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To check the ease of motion, swing the knife holder 2 manually.
Tighten screw 3 again.
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Setting the clearance to the needle
Loosen screw 6.
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Move knife 7.
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Tighten screw 6.
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