Duerkopp Adler 745-22 Service Instructions Manual page 67

Caution Risk of Injury !
Turn the main switch off.
Set the trimming and clamping device for the underthreads only with
the main switch turned off.
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Loosen screw 7.
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Align the openings in the underthread shears 1 centered to the
thread grooves of the needle plate.
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Tighten screw 7.
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Loosen screw 6.
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Set the underthread shears 1 higher or lower.
The top of the underthread shears must build one surface with the
top of the needle plate.
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Tighten screw 6.
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Align the spring clamping plates 5.
The spring clamping plates must lay on level at the needle plate
walls with a light spring pressure.
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Check the safety clearance of the hook points to the pneumatically
opened spring clamping plates.
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If necessary adjust the limiter plates 4 accordingly.
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Regulate the jet of air for cleaning the underthread shears at the
throttle valve 8.
The stitch formation should not be effected by the jet of air.
Light sewing pieces (e.g. lining material) should not be raised from
the needle plate.
Reduce the jet of air accordingly.
6
7
8
Changing the underthread shears
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Loosen screw 6.
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Remove the pressure spring.
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Remove the knife together with the guide strip.
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