Adjustment Of Equal Stitch Length For Left And Right Buttonhole Seams - Pfaff Select 1520 Service Manual

39. Adjustment of equal stitch length for left and right buttonhole seams

Requirement:
The stitch lengths of the left buttonhole seam and of the right buttonhole seam must be the same (fig. 78).
Note:
When the correct zero point has been set on the stitch length regulator, the stitch lengths of the buttonho-
le seams are normally the same (section 11 of this manual).
Check:
Sew a buttonhole with gimp thread and compare the two stitch lengths.
Adjustment:
If right buttonhole seam has longer stitch length than left one (fig. 79), turn setting eccentric slightly to
the front in direction "A" (fig. 81).
If left buttonhole seam has longer stitch length than right one (fig. 80), turn setting eccentric slightly to
the rear in direction "B" (fig. 81).
Cross-check:
Sew a buttonhole with gimp thread and check the stitch length.
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