Needle Bar Height - Duerkopp Adler 558 Service Instructions Manual

28.3 Needle Bar Height

40
1
2
3
a
The needle bar height is 2.5 mm.
When the needle bar has risen in the amount of the needle bar height
plus the looping stroke out of its lower dead center, then 3/4 of the
needle eye should be visible under the lower edge of the left hook. See
Illus.: a .
Caution Risk of Injury !
Pull the mains plug before setting.
–
Bring the needle bar in its lower dead center by turning the
handwheel.
–
Find the lower dead center of the needle bar.
Measure the clearance X from the upper edge of the needle bar to
the bush.
To the dimension found add the looping stroke dimension (see
Device Summary Table) and the needle bar height.
Example:
Lower dead center of the needle bar e.g. 11.1 mm
+ Looping stroke
+ Needle bar height
–
Move the needle bar up by the calculated amount out of its lower
dead center through turning the handwheel.
In this setting 3/4 of the needle eye should be visible under the
lower edge of the left hook ( see illus.: a ).
–
Set the maximum buttonhole width.
–
Loosen the setting collars 1 and 3.
–
Set the needle bar height accordingly.
–
Tighten the setting collars 1 and 3 again.
So that the needle bar, during sewing of the buttonhole eye, can
easily turn set lubricating air between both setting collars and
crosshead 2.
2.7 mm
2.5 mm
16.3 mm