DURKOPP ADLER 559 Operating, Installation And Servicing Instructions page 32

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The cutting knife has to be adjusted in such a way that it cuts in the
center of the sewn buttonhole shape.
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Insert the cutting block.
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Insert a short needle.
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Load a piece of paper or cardboard as sewing material.
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Sew a buttonhole.
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Check the position of the cut.
Correction
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Loosen two screws 5 at the base plate 3.
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Correct the position of the cutting knife 2 laterally.
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Tighten the screws 5 at the base plate 3.
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Loosen screw 4.
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Shift the cutting knife 2 to the front or to the back.
As a presetting shift the cutting knife to the setting dimension X
(center of buttonhole eyelet to the groove of the throat plate holder)
listed in the table below.
As a fine adjustment shift the cutting knife in such a way that it cuts
in the centre of the buttonhole shape.
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Tighten screw 4.
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Loosen screw 6.
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Position guide 7 close to the cutting knife.
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Tighten screw 6.
3 2
Sewing equipment
1501 / 1502
1521 / 1504
1524 1522
1573 1551 1553
1590 / 1595
Setting dimension (X)
approx. 59 mm
approx. 47 mm
approx. 49,5 mm up to
center of the eyelet
7 6