Adjustment Of The Needle Sidewise Movement (Needle Swing Timing) - promelectroavtomat XL2120 Service Manual

Adjustment

4. Adjustment of the Needle Sidewise Movement (Needle Swing Timing)

• The needle swing should be 0.05 mm or less while the needle moves down from the needle plate to its lowest
position. While the needle moves up from its lowest position to the needle plate, the needle swing should be
0.15 mm or less. These clearances should be on both sides of the needle plate hole.
1 Turn the selection dial to select the maximum zigzag width.
2 Match the position of the gear hole to that of the oval part of the frame.
3 Loosen the two screws (Set screw, socket (FT) size M 4 × 4) securing the worm pulley.
4 Turn the pulley to bring the needle bar to its highest position.
5 Tighten the two screws (Set screw, socket (FT) size M 4 × 4) to secure the worm pulley.
6 Turn the pulley to verify that needle swing timing is within criteria.
or
<0.05 mm
3 - 4
Worm pulley
<0.05 mm
When needle
goes down ... less than 0.05 mm
<0.15
When needle
mm
comes up ... less than 0.15 mm
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Set screw, socket (FT) M4 × 4