2.5.3
Adjusting the looping stroke
Standard checking
The looping stroke is the way of the needle bars from the bottom dead
centre to the point where the hook tips 3 are at the level of the middle
of needle 4.
The looping stroke is 2 mm.
It is set with the locking peg (order number 0211 000700).
Caution: Danger of injury !
Switch off the main switch.
Check and adjust the looping stroke only with the sewing unit
switched off.
–
Remove the throat plate.
–
Remove the bobbin case top parts 1 with the bobbins.
–
Bring the machine head in
looping stroke
position by handwheel
and arrest it with the locking peg.
–
Check the position of the hook tips to the needles.
Correction
–
Remove throat plate, bobbin case top parts and bobbins.
–
Swing the sewing machine head upwards.
–
Remove the plastic stoppers 2.
–
Loosen the screws under the plastic stoppers.
–
Lock the machine in looping stroke position.
–
Turn the hook manually until the hook tips are at the level of the
middle of the needle.
–
Tighten the first of the screws located under the plastic stoppers 2.
–
Remove the locking peg.
–
Keep on turning the machine and tighten the second screw.
–
Press the plastic stoppers 2 into the drill-holes again.
29
4 3
0,1 mm
2
1
