Pfaff select 1520, Service Manual

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62
32. Adjustment of needle bar height
This machine has a transverse double-rotating hook.
At the right zigzag penetration, the sewing hook reaches the needle a little earlier and at the left penetrati-
on a little later than at the center penetration.
As a result of this, the position of sewing hook at the right zigzag penetration is slightly higher above the
needle eye than at the left zigzag-penetration (fig. 65).
Requirement:
The clearance between the top edge of the needle eye and the lower edge of the sewing hook point must
be 0.5 mm at the widest left zigzag penetration (fig. 66).
Check:
z
Press the button for the widest zigzag stitch.
z
Turn the handwheel until the needle rises at the left zigzag stitch and the sewing hook point is exactly
behind the needle center line.
z
The clearance between the top edge of the needle eye and the lower edge of the sewing hook point
must be 0.5 mm.
Adjustment:
z
Loosen screw 112 just a little (fig. 67).
z
Shift needle bar 30 in height, without twisting it, until the clearance of 0.5 mm is set.
z
Tighten screw 112.
Cross-check:
z
Check the clearance of 0.5 mm.
The needle holder must face exactly square to the right.