13. Needle bar height
Caution: Danger of injury !
Switchthemainswitchoff.
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. 3/4 of the
needle’s eye 6 is to be seen under the left hook tip when the needle
bar has moved upward by 2.5 mm from the looping 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 slide gauge.
–
Scale down the measurement on the slide gauge by the looping
stroke dimension +2.5 mm.
Example:
Looping stroke = 2.7 mm +2.5 mm = Scale the measurement down
by 5.2 mm
–
Put the slide gauge with the scaled-down measurement on the
edge 1.
–
Slowly continue turning the handwheel in rotation direction until the
needle bar hits the slide gauge.
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.
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