Needle Bar Height - DURKOPP ADLER 580 Operating Instructions Manual

13. Needle bar height

48
2 1
Caution: Danger of injury !
Turn the main switch off.
Adjust the needle bars only with the machine switched off.
Standard checking
The needle bar has to be adjusted in such a way that approx. ¾ of the
needle's eye is to be seen under the left looper tip when the needle bar
has moved upward by 2.5 mm from the loop stroke position.
–
Turn the handwheel until the needle is in the bottom dead centre.
–
Measure the distance between the edge 1 and the top edge of
needle bar 2 with a vernier caliper.
–
Scale down the dimension on the vernier caliper by the loop stroke
dimension +2.5 mm.
Example:
Loop stroke = 2.7 mm +2.5 mm = Scale the dimension down
by 5.2 mm
–
Put the vernier caliper with the scaled-down dimension on
the edge 1.
–
Slowly continue turning the handwheel in rotation direction until the
needle bar hits the vernier caliper.
Correction
–
Loosen the screws at the adjusting rings 3 and 4.
–
Adjust the height of needle bar 5.
–
Tighten the screws at the adjusting rings 3 and 4.
Note
It must still be possible to turn the needle bar easily after tightening the
screws.
5 4 3