50
26. Adjustment of the sideways movement of the needle bar on Pfaff 1540
Requirement:
During zigzag sewing operation the sideways movement of the needle should stop above the highest
possible fabric thickness.
The sideways movement of the needle must start when the needle point is leaving the needle plate.
It must be completed before the needle enters the fabric again, approx. 8 mm above the needle
plate (fig. 50).
Check:
z Set stitch width adjustment dial to the maximum zigzag width.
z Set needle position adjustment dial to "center".
z Press zigzag stitch button.
z Remove presser foot.
z Turn the handwheel in sewing direction, until the needle rises on the left-hand side and the needle
point is positioned exactly on the surface of the needle plate (fig. 51).
z You can check the start of the sideways movement of the needle by simultaneously touching the back
side of the needle bar frame and the machine head with the index finger of your left hand while turning
the handwheel very slowly with your right hand.
Adjustment:
z Loosen the two screws 101 (fig. 52).
z Turn the handwheel in sewing direction, until the needle rises on the left-hand side and the needle
point is positioned exactly on the surface of the needle plate (fig. 51).
z Rotate the large gear 98 in the direction of the arrow until feeler finger 102 (fig. 53) is exactly at the
starting point of rising cam 103.
z Hold the large gear 98 firmly in this position to prevent it from turning.
z Disengage the small gear 97 by moving it to the right, rotate it until one of the screws 101 is accessible
and then move it fully to the left and re-engage.
z Gently tighten screw 101.
Cross-check:
z Test the needle bar sideways movement as described under "Check".
z Tighten the two screws 101.
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