72
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:
z Sew a buttonhole with gimp thread and compare the two stitch lengths.
Adjustment:
z 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).
z 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:
z Sew a buttonhole with gimp thread and check the stitch length.
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