Needle Bar Height - Duerkopp Adler 669 Service Instructions Manual

2.6.2

Needle bar height

2 1
Caution: Risk of injury!
Turn off the main switch.
Check and set the needle bar height only when the machine is
switched off.
Standard checking
The needle bar's height is to be set in a way that the hook tip stands in
the lower third of the needle scarf with the stitch length set to the
largest one and the machine in the looping stroke position.
–
Set the stitch regulator lever or the stitch length setting wheel to
"largest stitch length".
–
Arrest the sewing machine at locking position I (looping stroke
position).
–
Check the position of the needle in relation to the hook tip.
Correction
–
Set the stitch regulator lever or the stitch length setting wheel to
"largest stitch length".
–
Arrest the sewing machine at locking position I (looping stroke
position).
–
Unscrew the face cover.
–
Loosen the fastening screw 2 of the needle bar.
–
Shift the needle bar 1 with needle 3.
Upon shifting, the needle bar must not be twisted.
The needle scarf must be directed to the hook tip.
–
Tighten the fastening screw of the needle bar.
A wrong setting of the needle bar height can have the following effects:
–
Damage on the hook tip.
–
Jamming of the needle thread between needle an needle guard.
–
Skip stitches and thread breakage.
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