Electromagnetic Foot Lift - Duerkopp Adler 271 Service Manual

3.3 Electromagnetic foot lift

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Regulation and inspection
The armature of the lifting magnet must reach its left-hand end
position when it is operated.
After several years' intensive use the dimensions of the damping disc
6 may change, as a result of which the lowering of the sewing foot
becomes too slow or the magnet makes knocking noises when it
operates. This can mean that when started up the sewing machine
executes a few stitches before the foot has fully reached the material
(i.e. there is a danger of faulty stitches at the start of the seam).
Caution: danger of injury
Turn off the main switch.
The sewing-foot lift may only be adjusted with the sewing machine
switched off.
Adjustment
–
Undo nut 2 and screw 1.
–
Set the required lift with the articulated lever 3.
The armature of the lifting magnet 4 must reach its left-hand end
position.
–
Retighten screw 1 and nut 2.
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Remove retaining washer 5.
–
Remove the lifting magnet from its housing.
–
Replace damping disc 6 (0271 001767).
–
Replace lifting magnet.
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Replace retaining washer 5.
IMPORTANT
In case of the classes 273 and 274 please note that following a
change of the lift it is absolutely necessary to ensure that, in lifting
position, the minimum distance between the hinged foot top 8 and the
fabric bar bush 7 amounts to 0.5 mm.
Otherwise, the parts of the lifting system may be damaged.
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