Re-Sharpening The Counter Knife - Duerkopp Adler 609 Service Instructions Manual

7.8 Re-sharpening the counter knife

Caution Risk of Injury!
Turn the main switch off.
Install a re-sharpened knife only with the sewing machine turned off.
ATTENTION!
When a re-sharpened knife has lost more than 0.5 mm of its original
length, it should be replaced by a new knife.
Rule and control
The cutting angle of a stationary knife should be about 5° (see
diagram). A fine-grit stone must be used to re-sharpen the knives.
Adjustment
–
Loosen cutting-pressure screws 5.
The pre-tension of the stationary knife 2 is reduced.
–
Take out knife 2.
–
Re-sharpen the knife.
The cutting angle of a stationary knife should be about 5°.
–
Install knife 2.
–
Align the knife so that the threads are securely cut (see
Chapt. 7.6).
–
Tighten the counter knife screw tightly.
–
Re-adjust the cutting pressure (see chapter 7.7).
2 1
23
GB